/*    perl.c
 *
 *    Copyright (c) 1987-2002 Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/*
 * "A ship then new they built for him/of mithril and of elven glass" --Bilbo
 */

#include "EXTERN.h"
#define PERL_IN_PERL_C
#include "perl.h"
#include "patchlevel.h"			/* for local_patches */

#ifdef NETWARE
#include "nwutil.h"	
char *nw_get_sitelib(const char *pl);
#endif

/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
#ifdef I_UNISTD
#include <unistd.h>
#endif

#if !defined(STANDARD_C) && !defined(HAS_GETENV_PROTOTYPE) && !defined(PERL_MICRO)
char *getenv (char *); /* Usually in <stdlib.h> */
#endif

static I32 read_e_script(pTHX_ int idx, SV *buf_sv, int maxlen);

#ifdef IAMSUID
#ifndef DOSUID
#define DOSUID
#endif
#endif

#ifdef SETUID_SCRIPTS_ARE_SECURE_NOW
#ifdef DOSUID
#undef DOSUID
#endif
#endif

#if defined(USE_5005THREADS)
#  define INIT_TLS_AND_INTERP \
    STMT_START {				\
	if (!PL_curinterp) {			\
	    PERL_SET_INTERP(my_perl);		\
	    INIT_THREADS;			\
	    ALLOC_THREAD_KEY;			\
	}					\
    } STMT_END
#else
#  if defined(USE_ITHREADS)
#  define INIT_TLS_AND_INTERP \
    STMT_START {				\
	if (!PL_curinterp) {			\
	    PERL_SET_INTERP(my_perl);		\
	    INIT_THREADS;			\
	    ALLOC_THREAD_KEY;			\
	    PERL_SET_THX(my_perl);		\
	    OP_REFCNT_INIT;			\
	}					\
	else {					\
	    PERL_SET_THX(my_perl);		\
	}					\
    } STMT_END
#  else
#  define INIT_TLS_AND_INTERP \
    STMT_START {				\
	if (!PL_curinterp) {			\
	    PERL_SET_INTERP(my_perl);		\
	}					\
	PERL_SET_THX(my_perl);			\
    } STMT_END
#  endif
#endif

#ifdef PERL_IMPLICIT_SYS
PerlInterpreter *
perl_alloc_using(struct IPerlMem* ipM, struct IPerlMem* ipMS,
		 struct IPerlMem* ipMP, struct IPerlEnv* ipE,
		 struct IPerlStdIO* ipStd, struct IPerlLIO* ipLIO,
		 struct IPerlDir* ipD, struct IPerlSock* ipS,
		 struct IPerlProc* ipP)
{
    PerlInterpreter *my_perl;
    /* New() needs interpreter, so call malloc() instead */
    my_perl = (PerlInterpreter*)(*ipM->pMalloc)(ipM, sizeof(PerlInterpreter));
    INIT_TLS_AND_INTERP;
    Zero(my_perl, 1, PerlInterpreter);
    PL_Mem = ipM;
    PL_MemShared = ipMS;
    PL_MemParse = ipMP;
    PL_Env = ipE;
    PL_StdIO = ipStd;
    PL_LIO = ipLIO;
    PL_Dir = ipD;
    PL_Sock = ipS;
    PL_Proc = ipP;

    return my_perl;
}
#else

/*
=head1 Embedding Functions

=for apidoc perl_alloc

Allocates a new Perl interpreter.  See L<perlembed>.

=cut
*/

PerlInterpreter *
perl_alloc(void)
{
    PerlInterpreter *my_perl;
#ifdef USE_5005THREADS
    dTHX;
#endif

    /* New() needs interpreter, so call malloc() instead */
    my_perl = (PerlInterpreter*)PerlMem_malloc(sizeof(PerlInterpreter));

    INIT_TLS_AND_INTERP;
    Zero(my_perl, 1, PerlInterpreter);
    return my_perl;
}
#endif /* PERL_IMPLICIT_SYS */

/*
=for apidoc perl_construct

Initializes a new Perl interpreter.  See L<perlembed>.

=cut
*/

void
perl_construct(pTHXx)
{
#ifdef USE_5005THREADS
#ifndef FAKE_THREADS
    struct perl_thread *thr = NULL;
#endif /* FAKE_THREADS */
#endif /* USE_5005THREADS */

#ifdef MULTIPLICITY
    init_interp();
    PL_perl_destruct_level = 1;
#else
   if (PL_perl_destruct_level > 0)
       init_interp();
#endif

   /* Init the real globals (and main thread)? */
    if (!PL_linestr) {
#ifdef USE_5005THREADS
	MUTEX_INIT(&PL_sv_mutex);
	/*
	 * Safe to use basic SV functions from now on (though
	 * not things like mortals or tainting yet).
	 */
	MUTEX_INIT(&PL_eval_mutex);
	COND_INIT(&PL_eval_cond);
	MUTEX_INIT(&PL_threads_mutex);
	COND_INIT(&PL_nthreads_cond);
#  ifdef EMULATE_ATOMIC_REFCOUNTS
	MUTEX_INIT(&PL_svref_mutex);
#  endif /* EMULATE_ATOMIC_REFCOUNTS */
	
	MUTEX_INIT(&PL_cred_mutex);
	MUTEX_INIT(&PL_sv_lock_mutex);
	MUTEX_INIT(&PL_fdpid_mutex);

	thr = init_main_thread();
#endif /* USE_5005THREADS */

#ifdef PERL_FLEXIBLE_EXCEPTIONS
	PL_protect = MEMBER_TO_FPTR(Perl_default_protect); /* for exceptions */
#endif

	PL_curcop = &PL_compiling;	/* needed by ckWARN, right away */

	PL_linestr = NEWSV(65,79);
	sv_upgrade(PL_linestr,SVt_PVIV);

	if (!SvREADONLY(&PL_sv_undef)) {
	    /* set read-only and try to insure than we wont see REFCNT==0
	       very often */

	    SvREADONLY_on(&PL_sv_undef);
	    SvREFCNT(&PL_sv_undef) = (~(U32)0)/2;

	    sv_setpv(&PL_sv_no,PL_No);
	    SvNV(&PL_sv_no);
	    SvREADONLY_on(&PL_sv_no);
	    SvREFCNT(&PL_sv_no) = (~(U32)0)/2;

	    sv_setpv(&PL_sv_yes,PL_Yes);
	    SvNV(&PL_sv_yes);
	    SvREADONLY_on(&PL_sv_yes);
	    SvREFCNT(&PL_sv_yes) = (~(U32)0)/2;
	}

	PL_sighandlerp = Perl_sighandler;
	PL_pidstatus = newHV();
    }

    PL_rs = newSVpvn("\n", 1);

    init_stacks();

    init_ids();
    PL_lex_state = LEX_NOTPARSING;

    JMPENV_BOOTSTRAP;
    STATUS_ALL_SUCCESS;

    init_i18nl10n(1);
    SET_NUMERIC_STANDARD();

    {
	U8 *s;
	PL_patchlevel = NEWSV(0,4);
	(void)SvUPGRADE(PL_patchlevel, SVt_PVNV);
	if (PERL_REVISION > 127 || PERL_VERSION > 127 || PERL_SUBVERSION > 127)
	    SvGROW(PL_patchlevel, UTF8_MAXLEN*3+1);
	s = (U8*)SvPVX(PL_patchlevel);
	/* Build version strings using "native" characters */
	s = uvchr_to_utf8(s, (UV)PERL_REVISION);
	s = uvchr_to_utf8(s, (UV)PERL_VERSION);
	s = uvchr_to_utf8(s, (UV)PERL_SUBVERSION);
	*s = '\0';
	SvCUR_set(PL_patchlevel, s - (U8*)SvPVX(PL_patchlevel));
	SvPOK_on(PL_patchlevel);
	SvNVX(PL_patchlevel) = (NV)PERL_REVISION
				+ ((NV)PERL_VERSION / (NV)1000)
#if defined(PERL_SUBVERSION) && PERL_SUBVERSION > 0
				+ ((NV)PERL_SUBVERSION / (NV)1000000)
#endif
				;
	SvNOK_on(PL_patchlevel);	/* dual valued */
	SvUTF8_on(PL_patchlevel);
	SvREADONLY_on(PL_patchlevel);
    }

#if defined(LOCAL_PATCH_COUNT)
    PL_localpatches = local_patches;	/* For possible -v */
#endif

#ifdef HAVE_INTERP_INTERN
    sys_intern_init();
#endif

    PerlIO_init(aTHX);			/* Hook to IO system */

    PL_fdpid = newAV();			/* for remembering popen pids by fd */
    PL_modglobal = newHV();		/* pointers to per-interpreter module globals */
    PL_errors = newSVpvn("",0);
    sv_setpvn(PERL_DEBUG_PAD(0), "", 0);	/* For regex debugging. */
    sv_setpvn(PERL_DEBUG_PAD(1), "", 0);	/* ext/re needs these */
    sv_setpvn(PERL_DEBUG_PAD(2), "", 0);	/* even without DEBUGGING. */
#ifdef USE_ITHREADS
    PL_regex_padav = newAV();
    av_push(PL_regex_padav,(SV*)newAV());    /* First entry is an array of empty elements */
    PL_regex_pad = AvARRAY(PL_regex_padav);
#endif
#ifdef USE_REENTRANT_API
    Perl_reentrant_init(aTHX);
#endif

    /* Note that strtab is a rather special HV.  Assumptions are made
       about not iterating on it, and not adding tie magic to it.
       It is properly deallocated in perl_destruct() */
    PL_strtab = newHV();

#ifdef USE_5005THREADS
    MUTEX_INIT(&PL_strtab_mutex);
#endif
    HvSHAREKEYS_off(PL_strtab);			/* mandatory */
    hv_ksplit(PL_strtab, 512);

#if defined(__DYNAMIC__) && (defined(NeXT) || defined(__NeXT__))
    _dyld_lookup_and_bind
	("__environ", (unsigned long *) &environ_pointer, NULL);
#endif /* environ */

#ifdef  USE_ENVIRON_ARRAY
    PL_origenviron = environ;
#endif

    ENTER;
}

/*
=for apidoc nothreadhook

Stub that provides thread hook for perl_destruct when there are
no threads.

=cut
*/

int
Perl_nothreadhook(pTHX)
{
    return 0;
}

/*
=for apidoc perl_destruct

Shuts down a Perl interpreter.  See L<perlembed>.

=cut
*/

int
perl_destruct(pTHXx)
{
    volatile int destruct_level;  /* 0=none, 1=full, 2=full with checks */
    HV *hv;
#ifdef USE_5005THREADS
    Thread t;
    dTHX;
#endif /* USE_5005THREADS */

    /* wait for all pseudo-forked children to finish */
    PERL_WAIT_FOR_CHILDREN;

#ifdef USE_5005THREADS
#ifndef FAKE_THREADS
    /* Pass 1 on any remaining threads: detach joinables, join zombies */
  retry_cleanup:
    MUTEX_LOCK(&PL_threads_mutex);
    DEBUG_S(PerlIO_printf(Perl_debug_log,
			  "perl_destruct: waiting for %d threads...\n",
			  PL_nthreads - 1));
    for (t = thr->next; t != thr; t = t->next) {
	MUTEX_LOCK(&t->mutex);
	switch (ThrSTATE(t)) {
	    AV *av;
	case THRf_ZOMBIE:
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: joining zombie %p\n", t));
	    ThrSETSTATE(t, THRf_DEAD);
	    MUTEX_UNLOCK(&t->mutex);
	    PL_nthreads--;
	    /*
	     * The SvREFCNT_dec below may take a long time (e.g. av
	     * may contain an object scalar whose destructor gets
	     * called) so we have to unlock threads_mutex and start
	     * all over again.
	     */
	    MUTEX_UNLOCK(&PL_threads_mutex);
	    JOIN(t, &av);
	    SvREFCNT_dec((SV*)av);
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: joined zombie %p OK\n", t));
	    goto retry_cleanup;
	case THRf_R_JOINABLE:
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: detaching thread %p\n", t));
	    ThrSETSTATE(t, THRf_R_DETACHED);
	    /*
	     * We unlock threads_mutex and t->mutex in the opposite order
	     * from which we locked them just so that DETACH won't
	     * deadlock if it panics. It's only a breach of good style
	     * not a bug since they are unlocks not locks.
	     */
	    MUTEX_UNLOCK(&PL_threads_mutex);
	    DETACH(t);
	    MUTEX_UNLOCK(&t->mutex);
	    goto retry_cleanup;
	default:
	    DEBUG_S(PerlIO_printf(Perl_debug_log,
				  "perl_destruct: ignoring %p (state %u)\n",
				  t, ThrSTATE(t)));
	    MUTEX_UNLOCK(&t->mutex);
	    /* fall through and out */
	}
    }
    /* We leave the above "Pass 1" loop with threads_mutex still locked */

    /* Pass 2 on remaining threads: wait for the thread count to drop to one */
    while (PL_nthreads > 1)
    {
	DEBUG_S(PerlIO_printf(Perl_debug_log,
			      "perl_destruct: final wait for %d threads\n",
			      PL_nthreads - 1));
	COND_WAIT(&PL_nthreads_cond, &PL_threads_mutex);
    }
    /* At this point, we're the last thread */
    MUTEX_UNLOCK(&PL_threads_mutex);
    DEBUG_S(PerlIO_printf(Perl_debug_log, "perl_destruct: armageddon has arrived\n"));
    MUTEX_DESTROY(&PL_threads_mutex);
    COND_DESTROY(&PL_nthreads_cond);
    PL_nthreads--;
#endif /* !defined(FAKE_THREADS) */
#endif /* USE_5005THREADS */

    destruct_level = PL_perl_destruct_level;
#ifdef DEBUGGING
    {
	char *s;
	if ((s = PerlEnv_getenv("PERL_DESTRUCT_LEVEL"))) {
	    int i = atoi(s);
	    if (destruct_level < i)
		destruct_level = i;
	}
    }
#endif


    if(PL_exit_flags & PERL_EXIT_DESTRUCT_END) {
        dJMPENV;
        int x = 0;

        JMPENV_PUSH(x);
        if (PL_endav && !PL_minus_c)
            call_list(PL_scopestack_ix, PL_endav);
        JMPENV_POP;
    }
    LEAVE;
    FREETMPS;

    /* Need to flush since END blocks can produce output */
    my_fflush_all();

    if (CALL_FPTR(PL_threadhook)(aTHX)) {
        /* Threads hook has vetoed further cleanup */
        return STATUS_NATIVE_EXPORT;
    }

    /* We must account for everything.  */

    /* Destroy the main CV and syntax tree */
    if (PL_main_root) {
        /* If running under -d may not have PL_comppad. */
        PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL;
	op_free(PL_main_root);
	PL_main_root = Nullop;
    }
    PL_curcop = &PL_compiling;
    PL_main_start = Nullop;
    SvREFCNT_dec(PL_main_cv);
    PL_main_cv = Nullcv;
    PL_dirty = TRUE;

    /* Tell PerlIO we are about to tear things apart in case
       we have layers which are using resources that should
       be cleaned up now.
     */

    PerlIO_destruct(aTHX);

    if (PL_sv_objcount) {
	/*
	 * Try to destruct global references.  We do this first so that the
	 * destructors and destructees still exist.  Some sv's might remain.
	 * Non-referenced objects are on their own.
	 */
	sv_clean_objs();
    }

    /* unhook hooks which will soon be, or use, destroyed data */
    SvREFCNT_dec(PL_warnhook);
    PL_warnhook = Nullsv;
    SvREFCNT_dec(PL_diehook);
    PL_diehook = Nullsv;

    /* call exit list functions */
    while (PL_exitlistlen-- > 0)
	PL_exitlist[PL_exitlistlen].fn(aTHX_ PL_exitlist[PL_exitlistlen].ptr);

    Safefree(PL_exitlist);

    if (destruct_level == 0){

	DEBUG_P(debprofdump());

#if defined(PERLIO_LAYERS)
	/* No more IO - including error messages ! */
	PerlIO_cleanup(aTHX);
#endif

	/* The exit() function will do everything that needs doing. */
        return STATUS_NATIVE_EXPORT;
    }

    /* jettison our possibly duplicated environment */
    /* if PERL_USE_SAFE_PUTENV is defined environ will not have been copied
     * so we certainly shouldn't free it here
     */
#if defined(USE_ENVIRON_ARRAY) && !defined(PERL_USE_SAFE_PUTENV)
    if (environ != PL_origenviron
#ifdef USE_ITHREADS
	/* only main thread can free environ[0] contents */
	&& PL_curinterp == aTHX
#endif
	)
    {
	I32 i;

	for (i = 0; environ[i]; i++)
	    safesysfree(environ[i]);

	/* Must use safesysfree() when working with environ. */
	safesysfree(environ);		

	environ = PL_origenviron;
    }
#endif

#ifdef USE_ITHREADS
    /* the syntax tree is shared between clones
     * so op_free(PL_main_root) only ReREFCNT_dec's
     * REGEXPs in the parent interpreter
     * we need to manually ReREFCNT_dec for the clones
     */
    {
        I32 i = AvFILLp(PL_regex_padav) + 1;
        SV **ary = AvARRAY(PL_regex_padav);

        while (i) {
            SV *resv = ary[--i];
            REGEXP *re = INT2PTR(REGEXP *,SvIVX(resv));

            if (SvFLAGS(resv) & SVf_BREAK) {
                /* this is PL_reg_curpm, already freed
                 * flag is set in regexec.c:S_regtry
                 */
                SvFLAGS(resv) &= ~SVf_BREAK;
            }
	    else if(SvREPADTMP(resv)) {
	      SvREPADTMP_off(resv);
	    }
            else {
                ReREFCNT_dec(re);
            }
        }
    }
    SvREFCNT_dec(PL_regex_padav);
    PL_regex_padav = Nullav;
    PL_regex_pad = NULL;
#endif

    /* loosen bonds of global variables */

    if(PL_rsfp) {
	(void)PerlIO_close(PL_rsfp);
	PL_rsfp = Nullfp;
    }

    /* Filters for program text */
    SvREFCNT_dec(PL_rsfp_filters);
    PL_rsfp_filters = Nullav;

    /* switches */
    PL_preprocess   = FALSE;
    PL_minus_n      = FALSE;
    PL_minus_p      = FALSE;
    PL_minus_l      = FALSE;
    PL_minus_a      = FALSE;
    PL_minus_F      = FALSE;
    PL_doswitches   = FALSE;
    PL_dowarn       = G_WARN_OFF;
    PL_doextract    = FALSE;
    PL_sawampersand = FALSE;	/* must save all match strings */
    PL_unsafe       = FALSE;

    Safefree(PL_inplace);
    PL_inplace = Nullch;
    SvREFCNT_dec(PL_patchlevel);

    if (PL_e_script) {
	SvREFCNT_dec(PL_e_script);
	PL_e_script = Nullsv;
    }

    while (--PL_origargc >= 0) {
        Safefree(PL_origargv[PL_origargc]);
    }
    Safefree(PL_origargv);

    /* magical thingies */

    SvREFCNT_dec(PL_ofs_sv);	/* $, */
    PL_ofs_sv = Nullsv;

    SvREFCNT_dec(PL_ors_sv);	/* $\ */
    PL_ors_sv = Nullsv;

    SvREFCNT_dec(PL_rs);	/* $/ */
    PL_rs = Nullsv;

    PL_multiline = 0;		/* $* */
    Safefree(PL_osname);	/* $^O */
    PL_osname = Nullch;

    SvREFCNT_dec(PL_statname);
    PL_statname = Nullsv;
    PL_statgv = Nullgv;

    /* defgv, aka *_ should be taken care of elsewhere */

    /* clean up after study() */
    SvREFCNT_dec(PL_lastscream);
    PL_lastscream = Nullsv;
    Safefree(PL_screamfirst);
    PL_screamfirst = 0;
    Safefree(PL_screamnext);
    PL_screamnext  = 0;

    /* float buffer */
    Safefree(PL_efloatbuf);
    PL_efloatbuf = Nullch;
    PL_efloatsize = 0;

    /* startup and shutdown function lists */
    SvREFCNT_dec(PL_beginav);
    SvREFCNT_dec(PL_beginav_save);
    SvREFCNT_dec(PL_endav);
    SvREFCNT_dec(PL_checkav);
    SvREFCNT_dec(PL_initav);
    PL_beginav = Nullav;
    PL_beginav_save = Nullav;
    PL_endav = Nullav;
    PL_checkav = Nullav;
    PL_initav = Nullav;

    /* shortcuts just get cleared */
    PL_envgv = Nullgv;
    PL_incgv = Nullgv;
    PL_hintgv = Nullgv;
    PL_errgv = Nullgv;
    PL_argvgv = Nullgv;
    PL_argvoutgv = Nullgv;
    PL_stdingv = Nullgv;
    PL_stderrgv = Nullgv;
    PL_last_in_gv = Nullgv;
    PL_replgv = Nullgv;
    PL_debstash = Nullhv;

    /* reset so print() ends up where we expect */
    setdefout(Nullgv);

    SvREFCNT_dec(PL_argvout_stack);
    PL_argvout_stack = Nullav;

    SvREFCNT_dec(PL_modglobal);
    PL_modglobal = Nullhv;
    SvREFCNT_dec(PL_preambleav);
    PL_preambleav = Nullav;
    SvREFCNT_dec(PL_subname);
    PL_subname = Nullsv;
    SvREFCNT_dec(PL_linestr);
    PL_linestr = Nullsv;
    SvREFCNT_dec(PL_pidstatus);
    PL_pidstatus = Nullhv;
    SvREFCNT_dec(PL_toptarget);
    PL_toptarget = Nullsv;
    SvREFCNT_dec(PL_bodytarget);
    PL_bodytarget = Nullsv;
    PL_formtarget = Nullsv;

    /* free locale stuff */
#ifdef USE_LOCALE_COLLATE
    Safefree(PL_collation_name);
    PL_collation_name = Nullch;
#endif

#ifdef USE_LOCALE_NUMERIC
    Safefree(PL_numeric_name);
    PL_numeric_name = Nullch;
    SvREFCNT_dec(PL_numeric_radix_sv);
#endif

    /* clear utf8 character classes */
    SvREFCNT_dec(PL_utf8_alnum);
    SvREFCNT_dec(PL_utf8_alnumc);
    SvREFCNT_dec(PL_utf8_ascii);
    SvREFCNT_dec(PL_utf8_alpha);
    SvREFCNT_dec(PL_utf8_space);
    SvREFCNT_dec(PL_utf8_cntrl);
    SvREFCNT_dec(PL_utf8_graph);
    SvREFCNT_dec(PL_utf8_digit);
    SvREFCNT_dec(PL_utf8_upper);
    SvREFCNT_dec(PL_utf8_lower);
    SvREFCNT_dec(PL_utf8_print);
    SvREFCNT_dec(PL_utf8_punct);
    SvREFCNT_dec(PL_utf8_xdigit);
    SvREFCNT_dec(PL_utf8_mark);
    SvREFCNT_dec(PL_utf8_toupper);
    SvREFCNT_dec(PL_utf8_totitle);
    SvREFCNT_dec(PL_utf8_tolower);
    SvREFCNT_dec(PL_utf8_tofold);
    SvREFCNT_dec(PL_utf8_idstart);
    SvREFCNT_dec(PL_utf8_idcont);
    PL_utf8_alnum	= Nullsv;
    PL_utf8_alnumc	= Nullsv;
    PL_utf8_ascii	= Nullsv;
    PL_utf8_alpha	= Nullsv;
    PL_utf8_space	= Nullsv;
    PL_utf8_cntrl	= Nullsv;
    PL_utf8_graph	= Nullsv;
    PL_utf8_digit	= Nullsv;
    PL_utf8_upper	= Nullsv;
    PL_utf8_lower	= Nullsv;
    PL_utf8_print	= Nullsv;
    PL_utf8_punct	= Nullsv;
    PL_utf8_xdigit	= Nullsv;
    PL_utf8_mark	= Nullsv;
    PL_utf8_toupper	= Nullsv;
    PL_utf8_totitle	= Nullsv;
    PL_utf8_tolower	= Nullsv;
    PL_utf8_tofold	= Nullsv;
    PL_utf8_idstart	= Nullsv;
    PL_utf8_idcont	= Nullsv;

    if (!specialWARN(PL_compiling.cop_warnings))
	SvREFCNT_dec(PL_compiling.cop_warnings);
    PL_compiling.cop_warnings = Nullsv;
    if (!specialCopIO(PL_compiling.cop_io))
	SvREFCNT_dec(PL_compiling.cop_io);
    PL_compiling.cop_io = Nullsv;
    CopFILE_free(&PL_compiling);
    CopSTASH_free(&PL_compiling);

    /* Prepare to destruct main symbol table.  */

    hv = PL_defstash;
    PL_defstash = 0;
    SvREFCNT_dec(hv);
    SvREFCNT_dec(PL_curstname);
    PL_curstname = Nullsv;

    /* clear queued errors */
    SvREFCNT_dec(PL_errors);
    PL_errors = Nullsv;

    FREETMPS;
    if (destruct_level >= 2 && ckWARN_d(WARN_INTERNAL)) {
	if (PL_scopestack_ix != 0)
	    Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
	         "Unbalanced scopes: %ld more ENTERs than LEAVEs\n",
		 (long)PL_scopestack_ix);
	if (PL_savestack_ix != 0)
	    Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
		 "Unbalanced saves: %ld more saves than restores\n",
		 (long)PL_savestack_ix);
	if (PL_tmps_floor != -1)
	    Perl_warner(aTHX_ packWARN(WARN_INTERNAL),"Unbalanced tmps: %ld more allocs than frees\n",
		 (long)PL_tmps_floor + 1);
	if (cxstack_ix != -1)
	    Perl_warner(aTHX_ packWARN(WARN_INTERNAL),"Unbalanced context: %ld more PUSHes than POPs\n",
		 (long)cxstack_ix + 1);
    }

    /* Now absolutely destruct everything, somehow or other, loops or no. */
    SvFLAGS(PL_fdpid) |= SVTYPEMASK;		/* don't clean out pid table now */
    SvFLAGS(PL_strtab) |= SVTYPEMASK;		/* don't clean out strtab now */

    /* the 2 is for PL_fdpid and PL_strtab */
    while (PL_sv_count > 2 && sv_clean_all())
	;

    SvFLAGS(PL_fdpid) &= ~SVTYPEMASK;
    SvFLAGS(PL_fdpid) |= SVt_PVAV;
    SvFLAGS(PL_strtab) &= ~SVTYPEMASK;
    SvFLAGS(PL_strtab) |= SVt_PVHV;

    AvREAL_off(PL_fdpid);		/* no surviving entries */
    SvREFCNT_dec(PL_fdpid);		/* needed in io_close() */
    PL_fdpid = Nullav;

#ifdef HAVE_INTERP_INTERN
    sys_intern_clear();
#endif

    /* Destruct the global string table. */
    {
	/* Yell and reset the HeVAL() slots that are still holding refcounts,
	 * so that sv_free() won't fail on them.
	 */
	I32 riter;
	I32 max;
	HE *hent;
	HE **array;

	riter = 0;
	max = HvMAX(PL_strtab);
	array = HvARRAY(PL_strtab);
	hent = array[0];
	for (;;) {
	    if (hent && ckWARN_d(WARN_INTERNAL)) {
		Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
		     "Unbalanced string table refcount: (%d) for \"%s\"",
		     HeVAL(hent) - Nullsv, HeKEY(hent));
		HeVAL(hent) = Nullsv;
		hent = HeNEXT(hent);
	    }
	    if (!hent) {
		if (++riter > max)
		    break;
		hent = array[riter];
	    }
	}
    }
    SvREFCNT_dec(PL_strtab);

#ifdef USE_ITHREADS
    /* free the pointer table used for cloning */
    ptr_table_free(PL_ptr_table);
#endif

    /* free special SVs */

    SvREFCNT(&PL_sv_yes) = 0;
    sv_clear(&PL_sv_yes);
    SvANY(&PL_sv_yes) = NULL;
    SvFLAGS(&PL_sv_yes) = 0;

    SvREFCNT(&PL_sv_no) = 0;
    sv_clear(&PL_sv_no);
    SvANY(&PL_sv_no) = NULL;
    SvFLAGS(&PL_sv_no) = 0;

    {
        int i;
        for (i=0; i<=2; i++) {
            SvREFCNT(PERL_DEBUG_PAD(i)) = 0;
            sv_clear(PERL_DEBUG_PAD(i));
            SvANY(PERL_DEBUG_PAD(i)) = NULL;
            SvFLAGS(PERL_DEBUG_PAD(i)) = 0;
        }
    }

    if (PL_sv_count != 0 && ckWARN_d(WARN_INTERNAL))
	Perl_warner(aTHX_ packWARN(WARN_INTERNAL),"Scalars leaked: %ld\n", (long)PL_sv_count);

#if defined(PERLIO_LAYERS)
    /* No more IO - including error messages ! */
    PerlIO_cleanup(aTHX);
#endif

    /* sv_undef needs to stay immortal until after PerlIO_cleanup
       as currently layers use it rather than Nullsv as a marker
       for no arg - and will try and SvREFCNT_dec it.
     */
    SvREFCNT(&PL_sv_undef) = 0;
    SvREADONLY_off(&PL_sv_undef);

    Safefree(PL_origfilename);
    Safefree(PL_reg_start_tmp);
    if (PL_reg_curpm)
	Safefree(PL_reg_curpm);
    Safefree(PL_reg_poscache);
    Safefree(HeKEY_hek(&PL_hv_fetch_ent_mh));
    Safefree(PL_op_mask);
    Safefree(PL_psig_ptr);
    Safefree(PL_psig_name);
    Safefree(PL_bitcount);
    Safefree(PL_psig_pend);
    nuke_stacks();
    PL_hints = 0;		/* Reset hints. Should hints be per-interpreter ? */

    DEBUG_P(debprofdump());
#ifdef USE_5005THREADS
    MUTEX_DESTROY(&PL_strtab_mutex);
    MUTEX_DESTROY(&PL_sv_mutex);
    MUTEX_DESTROY(&PL_eval_mutex);
    MUTEX_DESTROY(&PL_cred_mutex);
    MUTEX_DESTROY(&PL_fdpid_mutex);
    COND_DESTROY(&PL_eval_cond);
#ifdef EMULATE_ATOMIC_REFCOUNTS
    MUTEX_DESTROY(&PL_svref_mutex);
#endif /* EMULATE_ATOMIC_REFCOUNTS */

    /* As the penultimate thing, free the non-arena SV for thrsv */
    Safefree(SvPVX(PL_thrsv));
    Safefree(SvANY(PL_thrsv));
    Safefree(PL_thrsv);
    PL_thrsv = Nullsv;
#endif /* USE_5005THREADS */

#ifdef USE_REENTRANT_API
    Perl_reentrant_free(aTHX);
#endif

    sv_free_arenas();

    /* As the absolutely last thing, free the non-arena SV for mess() */

    if (PL_mess_sv) {
	/* it could have accumulated taint magic */
	if (SvTYPE(PL_mess_sv) >= SVt_PVMG) {
	    MAGIC* mg;
	    MAGIC* moremagic;
	    for (mg = SvMAGIC(PL_mess_sv); mg; mg = moremagic) {
		moremagic = mg->mg_moremagic;
		if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global
						&& mg->mg_len >= 0)
		    Safefree(mg->mg_ptr);
		Safefree(mg);
	    }
	}
	/* we know that type >= SVt_PV */
	(void)SvOOK_off(PL_mess_sv);
	Safefree(SvPVX(PL_mess_sv));
	Safefree(SvANY(PL_mess_sv));
	Safefree(PL_mess_sv);
	PL_mess_sv = Nullsv;
    }
    return STATUS_NATIVE_EXPORT;
}

/*
=for apidoc perl_free

Releases a Perl interpreter.  See L<perlembed>.

=cut
*/

void
perl_free(pTHXx)
{
#if defined(WIN32) || defined(NETWARE)
#  if defined(PERL_IMPLICIT_SYS)
#    ifdef NETWARE
    void *host = nw_internal_host;
#    else
    void *host = w32_internal_host;
#    endif
    PerlMem_free(aTHXx);
#    ifdef NETWARE
    nw_delete_internal_host(host);
#    else
    win32_delete_internal_host(host);
#    endif
#  else
    PerlMem_free(aTHXx);
#  endif
#else
    PerlMem_free(aTHXx);
#endif
}

void
Perl_call_atexit(pTHX_ ATEXIT_t fn, void *ptr)
{
    Renew(PL_exitlist, PL_exitlistlen+1, PerlExitListEntry);
    PL_exitlist[PL_exitlistlen].fn = fn;
    PL_exitlist[PL_exitlistlen].ptr = ptr;
    ++PL_exitlistlen;
}

/*
=for apidoc perl_parse

Tells a Perl interpreter to parse a Perl script.  See L<perlembed>.

=cut
*/

int
perl_parse(pTHXx_ XSINIT_t xsinit, int argc, char **argv, char **env)
{
    I32 oldscope;
    int ret;
    dJMPENV;
#ifdef USE_5005THREADS
    dTHX;
#endif

#ifdef SETUID_SCRIPTS_ARE_SECURE_NOW
#ifdef IAMSUID
#undef IAMSUID
    Perl_croak(aTHX_ "suidperl is no longer needed since the kernel can now execute\n\
setuid perl scripts securely.\n");
#endif
#endif

    PL_origargc = argc;
    {
        /* we copy rather than point to argv
         * since perl_clone will copy and perl_destruct
         * has no way of knowing if we've made a copy or
         * just point to argv
         */
        int i = PL_origargc;
        New(0, PL_origargv, i+1, char*);
        PL_origargv[i] = '\0';
        while (i-- > 0) {
            PL_origargv[i] = savepv(argv[i]);
        }
    }



    if (PL_do_undump) {

	/* Come here if running an undumped a.out. */

	PL_origfilename = savepv(argv[0]);
	PL_do_undump = FALSE;
	cxstack_ix = -1;		/* start label stack again */
	init_ids();
	init_postdump_symbols(argc,argv,env);
	return 0;
    }

    if (PL_main_root) {
	PL_curpad = AvARRAY(PL_comppad);
	op_free(PL_main_root);
	PL_main_root = Nullop;
    }
    PL_main_start = Nullop;
    SvREFCNT_dec(PL_main_cv);
    PL_main_cv = Nullcv;

    time(&PL_basetime);
    oldscope = PL_scopestack_ix;
    PL_dowarn = G_WARN_OFF;

#ifdef PERL_FLEXIBLE_EXCEPTIONS
    CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_vparse_body), env, xsinit);
#else
    JMPENV_PUSH(ret);
#endif
    switch (ret) {
    case 0:
#ifndef PERL_FLEXIBLE_EXCEPTIONS
	parse_body(env,xsinit);
#endif
	if (PL_checkav)
	    call_list(oldscope, PL_checkav);
	ret = 0;
	break;
    case 1:
	STATUS_ALL_FAILURE;
	/* FALL THROUGH */
    case 2:
	/* my_exit() was called */
	while (PL_scopestack_ix > oldscope)
	    LEAVE;
	FREETMPS;
	PL_curstash = PL_defstash;
	if (PL_checkav)
	    call_list(oldscope, PL_checkav);
	ret = STATUS_NATIVE_EXPORT;
	break;
    case 3:
	PerlIO_printf(Perl_error_log, "panic: top_env\n");
	ret = 1;
	break;
    }
    JMPENV_POP;
    return ret;
}

#ifdef PERL_FLEXIBLE_EXCEPTIONS
STATIC void *
S_vparse_body(pTHX_ va_list args)
{
    char **env = va_arg(args, char**);
    XSINIT_t xsinit = va_arg(args, XSINIT_t);

    return parse_body(env, xsinit);
}
#endif

STATIC void *
S_parse_body(pTHX_ char **env, XSINIT_t xsinit)
{
    int argc = PL_origargc;
    char **argv = PL_origargv;
    char *scriptname = NULL;
    int fdscript = -1;
    VOL bool dosearch = FALSE;
    char *validarg = "";
    AV* comppadlist;
    register SV *sv;
    register char *s;
    char *cddir = Nullch;

    sv_setpvn(PL_linestr,"",0);
    sv = newSVpvn("",0);		/* first used for -I flags */
    SAVEFREESV(sv);
    init_main_stash();

    for (argc--,argv++; argc > 0; argc--,argv++) {
	if (argv[0][0] != '-' || !argv[0][1])
	    break;
#ifdef DOSUID
    if (*validarg)
	validarg = " PHOOEY ";
    else
	validarg = argv[0];
#endif
	s = argv[0]+1;
      reswitch:
	switch (*s) {
	case 'C':
#ifdef	WIN32
	    win32_argv2utf8(argc-1, argv+1);
	    /* FALL THROUGH */
#endif
#ifndef PERL_STRICT_CR
	case '\r':
#endif
	case ' ':
	case '0':
	case 'F':
	case 'a':
	case 'c':
	case 'd':
	case 'D':
	case 'h':
	case 'i':
	case 'l':
	case 'M':
	case 'm':
	case 'n':
	case 'p':
	case 's':
	case 'u':
	case 'U':
	case 'v':
	case 'W':
	case 'X':
	case 'w':
	    if ((s = moreswitches(s)))
		goto reswitch;
	    break;

	case 't':
	    if( !PL_tainting ) {
	         PL_taint_warn = TRUE;
	         PL_tainting = TRUE;
	    }
	    s++;
	    goto reswitch;
	case 'T':
	    PL_tainting = TRUE;
	    PL_taint_warn = FALSE;
	    s++;
	    goto reswitch;

	case 'e':
#ifdef MACOS_TRADITIONAL
	    /* ignore -e for Dev:Pseudo argument */
	    if (argv[1] && !strcmp(argv[1], "Dev:Pseudo"))
	    	break;
#endif
	    if (PL_euid != PL_uid || PL_egid != PL_gid)
		Perl_croak(aTHX_ "No -e allowed in setuid scripts");
	    if (!PL_e_script) {
		PL_e_script = newSVpvn("",0);
		filter_add(read_e_script, NULL);
	    }
	    if (*++s)
		sv_catpv(PL_e_script, s);
	    else if (argv[1]) {
		sv_catpv(PL_e_script, argv[1]);
		argc--,argv++;
	    }
	    else
		Perl_croak(aTHX_ "No code specified for -e");
	    sv_catpv(PL_e_script, "\n");
	    break;

	case 'I':	/* -I handled both here and in moreswitches() */
	    forbid_setid("-I");
	    if (!*++s && (s=argv[1]) != Nullch) {
		argc--,argv++;
	    }
	    if (s && *s) {
		char *p;
		STRLEN len = strlen(s);
		p = savepvn(s, len);
		incpush(p, TRUE, TRUE);
		sv_catpvn(sv, "-I", 2);
		sv_catpvn(sv, p, len);
		sv_catpvn(sv, " ", 1);
		Safefree(p);
	    }
	    else
		Perl_croak(aTHX_ "No directory specified for -I");
	    break;
	case 'P':
	    forbid_setid("-P");
	    PL_preprocess = TRUE;
	    s++;
	    goto reswitch;
	case 'S':
	    forbid_setid("-S");
	    dosearch = TRUE;
	    s++;
	    goto reswitch;
	case 'V':
	    if (!PL_preambleav)
		PL_preambleav = newAV();
	    av_push(PL_preambleav, newSVpv("use Config qw(myconfig config_vars)",0));
	    if (*++s != ':')  {
		PL_Sv = newSVpv("print myconfig();",0);
#ifdef VMS
		sv_catpv(PL_Sv,"print \"\\nCharacteristics of this PERLSHR image: \\n\",");
#else
		sv_catpv(PL_Sv,"print \"\\nCharacteristics of this binary (from libperl): \\n\",");
#endif
		sv_catpv(PL_Sv,"\"  Compile-time options:");
#  ifdef DEBUGGING
		sv_catpv(PL_Sv," DEBUGGING");
#  endif
#  ifdef MULTIPLICITY
		sv_catpv(PL_Sv," MULTIPLICITY");
#  endif
#  ifdef USE_5005THREADS
		sv_catpv(PL_Sv," USE_5005THREADS");
#  endif
#  ifdef USE_ITHREADS
		sv_catpv(PL_Sv," USE_ITHREADS");
#  endif
#  ifdef USE_64_BIT_INT
		sv_catpv(PL_Sv," USE_64_BIT_INT");
#  endif
#  ifdef USE_64_BIT_ALL
		sv_catpv(PL_Sv," USE_64_BIT_ALL");
#  endif
#  ifdef USE_LONG_DOUBLE
		sv_catpv(PL_Sv," USE_LONG_DOUBLE");
#  endif
#  ifdef USE_LARGE_FILES
		sv_catpv(PL_Sv," USE_LARGE_FILES");
#  endif
#  ifdef USE_SOCKS
		sv_catpv(PL_Sv," USE_SOCKS");
#  endif
#  ifdef PERL_IMPLICIT_CONTEXT
		sv_catpv(PL_Sv," PERL_IMPLICIT_CONTEXT");
#  endif
#  ifdef PERL_IMPLICIT_SYS
		sv_catpv(PL_Sv," PERL_IMPLICIT_SYS");
#  endif
		sv_catpv(PL_Sv,"\\n\",");

#if defined(LOCAL_PATCH_COUNT)
		if (LOCAL_PATCH_COUNT > 0) {
		    int i;
		    sv_catpv(PL_Sv,"\"  Locally applied patches:\\n\",");
		    for (i = 1; i <= LOCAL_PATCH_COUNT; i++) {
			if (PL_localpatches[i])
			    Perl_sv_catpvf(aTHX_ PL_Sv,"q\"  \t%s\n\",",PL_localpatches[i]);
		    }
		}
#endif
		Perl_sv_catpvf(aTHX_ PL_Sv,"\"  Built under %s\\n\"",OSNAME);
#ifdef __DATE__
#  ifdef __TIME__
		Perl_sv_catpvf(aTHX_ PL_Sv,",\"  Compiled at %s %s\\n\"",__DATE__,__TIME__);
#  else
		Perl_sv_catpvf(aTHX_ PL_Sv,",\"  Compiled on %s\\n\"",__DATE__);
#  endif
#endif
		sv_catpv(PL_Sv, "; \
$\"=\"\\n    \"; \
@env = map { \"$_=\\\"$ENV{$_}\\\"\" } sort grep {/^PERL/} keys %ENV; ");
#ifdef __CYGWIN__
		sv_catpv(PL_Sv,"\
push @env, \"CYGWIN=\\\"$ENV{CYGWIN}\\\"\";");
#endif
		sv_catpv(PL_Sv, "\
print \"  \\%ENV:\\n    @env\\n\" if @env; \
print \"  \\@INC:\\n    @INC\\n\";");
	    }
	    else {
		PL_Sv = newSVpv("config_vars(qw(",0);
		sv_catpv(PL_Sv, ++s);
		sv_catpv(PL_Sv, "))");
		s += strlen(s);
	    }
	    av_push(PL_preambleav, PL_Sv);
	    scriptname = BIT_BUCKET;	/* don't look for script or read stdin */
	    goto reswitch;
	case 'x':
	    PL_doextract = TRUE;
	    s++;
	    if (*s)
		cddir = s;
	    break;
	case 0:
	    break;
	case '-':
	    if (!*++s || isSPACE(*s)) {
		argc--,argv++;
		goto switch_end;
	    }
	    /* catch use of gnu style long options */
	    if (strEQ(s, "version")) {
		s = "v";
		goto reswitch;
	    }
	    if (strEQ(s, "help")) {
		s = "h";
		goto reswitch;
	    }
	    s--;
	    /* FALL THROUGH */
	default:
	    Perl_croak(aTHX_ "Unrecognized switch: -%s  (-h will show valid options)",s);
	}
    }
  switch_end:

    if (
#ifndef SECURE_INTERNAL_GETENV
        !PL_tainting &&
#endif
	(s = PerlEnv_getenv("PERL5OPT")))
    {
    	char *popt = s;
	while (isSPACE(*s))
	    s++;
	if (*s == '-' && *(s+1) == 'T') {
	    PL_tainting = TRUE;
            PL_taint_warn = FALSE;
	}
	else {
	    char *popt_copy = Nullch;
	    while (s && *s) {
	        char *d;
		while (isSPACE(*s))
		    s++;
		if (*s == '-') {
		    s++;
		    if (isSPACE(*s))
			continue;
		}
		d = s;
		if (!*s)
		    break;
		if (!strchr("DIMUdmtw", *s))
		    Perl_croak(aTHX_ "Illegal switch in PERL5OPT: -%c", *s);
		while (++s && *s) {
		    if (isSPACE(*s)) {
			if (!popt_copy) {
			    popt_copy = SvPVX(sv_2mortal(newSVpv(popt,0)));
			    s = popt_copy + (s - popt);
			    d = popt_copy + (d - popt);
			}
		        *s++ = '\0';
			break;
		    }
		}
		if (*d == 't') {
		    if( !PL_tainting ) {
		        PL_taint_warn = TRUE;
		        PL_tainting = TRUE;
		    }
		} else {
		    moreswitches(d);
		}
	    }
	}
    }

    if (PL_taint_warn && PL_dowarn != G_WARN_ALL_OFF) {
       PL_compiling.cop_warnings = newSVpvn(WARN_TAINTstring, WARNsize);
    }

    if (!scriptname)
	scriptname = argv[0];
    if (PL_e_script) {
	argc++,argv--;
	scriptname = BIT_BUCKET;	/* don't look for script or read stdin */
    }
    else if (scriptname == Nullch) {
#ifdef MSDOS
	if ( PerlLIO_isatty(PerlIO_fileno(PerlIO_stdin())) )
	    moreswitches("h");
#endif
	scriptname = "-";
    }

    init_perllib();

    open_script(scriptname,dosearch,sv,&fdscript);

    validate_suid(validarg, scriptname,fdscript);

#ifndef PERL_MICRO
#if defined(SIGCHLD) || defined(SIGCLD)
    {
#ifndef SIGCHLD
#  define SIGCHLD SIGCLD
#endif
	Sighandler_t sigstate = rsignal_state(SIGCHLD);
	if (sigstate == SIG_IGN) {
	    if (ckWARN(WARN_SIGNAL))
		Perl_warner(aTHX_ packWARN(WARN_SIGNAL),
			    "Can't ignore signal CHLD, forcing to default");
	    (void)rsignal(SIGCHLD, (Sighandler_t)SIG_DFL);
	}
    }
#endif
#endif

#ifdef MACOS_TRADITIONAL
    if (PL_doextract || gMacPerl_AlwaysExtract) {
#else
    if (PL_doextract) {
#endif
	find_beginning();
	if (cddir && PerlDir_chdir(cddir) < 0)
	    Perl_croak(aTHX_ "Can't chdir to %s",cddir);

    }

    PL_main_cv = PL_compcv = (CV*)NEWSV(1104,0);
    sv_upgrade((SV *)PL_compcv, SVt_PVCV);
    CvUNIQUE_on(PL_compcv);

    PL_comppad = newAV();
    av_push(PL_comppad, Nullsv);
    PL_curpad = AvARRAY(PL_comppad);
    PL_comppad_name = newAV();
    PL_comppad_name_fill = 0;
    PL_min_intro_pending = 0;
    PL_padix = 0;
#ifdef USE_5005THREADS
    av_store(PL_comppad_name, 0, newSVpvn("@_", 2));
    PL_curpad[0] = (SV*)newAV();
    SvPADMY_on(PL_curpad[0]);	/* XXX Needed? */
    CvOWNER(PL_compcv) = 0;
    New(666, CvMUTEXP(PL_compcv), 1, perl_mutex);
    MUTEX_INIT(CvMUTEXP(PL_compcv));
#endif /* USE_5005THREADS */

    comppadlist = newAV();
    AvREAL_off(comppadlist);
    av_store(comppadlist, 0, (SV*)PL_comppad_name);
    av_store(comppadlist, 1, (SV*)PL_comppad);
    CvPADLIST(PL_compcv) = comppadlist;

    boot_core_PerlIO();
    boot_core_UNIVERSAL();
#ifndef PERL_MICRO
    boot_core_xsutils();
#endif

    if (xsinit)
	(*xsinit)(aTHX);	/* in case linked C routines want magical variables */
#ifndef PERL_MICRO
#if defined(VMS) || defined(WIN32) || defined(DJGPP) || defined(__CYGWIN__) || defined(EPOC)
    init_os_extras();
#endif
#endif

#ifdef USE_SOCKS
#   ifdef HAS_SOCKS5_INIT
    socks5_init(argv[0]);
#   else
    SOCKSinit(argv[0]);
#   endif
#endif

    init_predump_symbols();
    /* init_postdump_symbols not currently designed to be called */
    /* more than once (ENV isn't cleared first, for example)	 */
    /* But running with -u leaves %ENV & @ARGV undefined!    XXX */
    if (!PL_do_undump)
	init_postdump_symbols(argc,argv,env);

    /* PL_wantutf8 is conditionally turned on by
     * locale.c:Perl_init_i18nl10n() if the environment
     * look like the user wants to use UTF-8. */
    if (PL_wantutf8) { /* Requires init_predump_symbols(). */
	 IO* io;
	 PerlIO* fp;
	 SV* sv;
	 /* Turn on UTF-8-ness on STDIN, STDOUT, STDERR
	  *  _and_ the default open discipline. */
	 if (PL_stdingv  && (io = GvIO(PL_stdingv))  && (fp = IoIFP(io)))
	      PerlIO_binmode(aTHX_ fp, IoTYPE(io), 0, ":utf8");
	 if (PL_defoutgv && (io = GvIO(PL_defoutgv)) && (fp = IoOFP(io)))
	      PerlIO_binmode(aTHX_ fp, IoTYPE(io), 0, ":utf8");
	 if (PL_stderrgv && (io = GvIO(PL_stderrgv)) && (fp = IoOFP(io)))
	      PerlIO_binmode(aTHX_ fp, IoTYPE(io), 0, ":utf8");
	 if ((sv = GvSV(gv_fetchpv("\017PEN", TRUE, SVt_PV)))) {
	     sv_setpvn(sv, ":utf8\0:utf8", 11);
	     SvSETMAGIC(sv);
	 }
    }

    init_lexer();

    /* now parse the script */

    SETERRNO(0,SS$_NORMAL);
    PL_error_count = 0;
#ifdef MACOS_TRADITIONAL
    if (gMacPerl_SyntaxError = (yyparse() || PL_error_count)) {
	if (PL_minus_c)
	    Perl_croak(aTHX_ "%s had compilation errors.\n", MacPerl_MPWFileName(PL_origfilename));
	else {
	    Perl_croak(aTHX_ "Execution of %s aborted due to compilation errors.\n",
		       MacPerl_MPWFileName(PL_origfilename));
	}
    }
#else
    if (yyparse() || PL_error_count) {
	if (PL_minus_c)
	    Perl_croak(aTHX_ "%s had compilation errors.\n", PL_origfilename);
	else {
	    Perl_croak(aTHX_ "Execution of %s aborted due to compilation errors.\n",
		       PL_origfilename);
	}
    }
#endif
    CopLINE_set(PL_curcop, 0);
    PL_curstash = PL_defstash;
    PL_preprocess = FALSE;
    if (PL_e_script) {
	SvREFCNT_dec(PL_e_script);
	PL_e_script = Nullsv;
    }

/*
   Not sure that this is still the right place to do this now that we
   no longer use PL_nrs. HVDS 2001/09/09
*/
    sv_setsv(get_sv("/", TRUE), PL_rs);

    if (PL_do_undump)
	my_unexec();

    if (isWARN_ONCE) {
	SAVECOPFILE(PL_curcop);
	SAVECOPLINE(PL_curcop);
	gv_check(PL_defstash);
    }

    LEAVE;
    FREETMPS;

#ifdef MYMALLOC
    if ((s=PerlEnv_getenv("PERL_DEBUG_MSTATS")) && atoi(s) >= 2)
	dump_mstats("after compilation:");
#endif

    ENTER;
    PL_restartop = 0;
    return NULL;
}

/*
=for apidoc perl_run

Tells a Perl interpreter to run.  See L<perlembed>.

=cut
*/

int
perl_run(pTHXx)
{
    I32 oldscope;
    int ret = 0;
    dJMPENV;
#ifdef USE_5005THREADS
    dTHX;
#endif

    oldscope = PL_scopestack_ix;
#ifdef VMS
    VMSISH_HUSHED = 0;
#endif

#ifdef PERL_FLEXIBLE_EXCEPTIONS
 redo_body:
    CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_vrun_body), oldscope);
#else
    JMPENV_PUSH(ret);
#endif
    switch (ret) {
    case 1:
	cxstack_ix = -1;		/* start context stack again */
	goto redo_body;
    case 0:				/* normal completion */
#ifndef PERL_FLEXIBLE_EXCEPTIONS
 redo_body:
	run_body(oldscope);
#endif
	/* FALL THROUGH */
    case 2:				/* my_exit() */
	while (PL_scopestack_ix > oldscope)
	    LEAVE;
	FREETMPS;
	PL_curstash = PL_defstash;
	if (!(PL_exit_flags & PERL_EXIT_DESTRUCT_END) &&
	    PL_endav && !PL_minus_c)
	    call_list(oldscope, PL_endav);
#ifdef MYMALLOC
	if (PerlEnv_getenv("PERL_DEBUG_MSTATS"))
	    dump_mstats("after execution:  ");
#endif
	ret = STATUS_NATIVE_EXPORT;
	break;
    case 3:
	if (PL_restartop) {
	    POPSTACK_TO(PL_mainstack);
	    goto redo_body;
	}
	PerlIO_printf(Perl_error_log, "panic: restartop\n");
	FREETMPS;
	ret = 1;
	break;
    }

    JMPENV_POP;
    return ret;
}

#ifdef PERL_FLEXIBLE_EXCEPTIONS
STATIC void *
S_vrun_body(pTHX_ va_list args)
{
    I32 oldscope = va_arg(args, I32);

    return run_body(oldscope);
}
#endif


STATIC void *
S_run_body(pTHX_ I32 oldscope)
{
    DEBUG_r(PerlIO_printf(Perl_debug_log, "%s $` $& $' support.\n",
                    PL_sawampersand ? "Enabling" : "Omitting"));

    if (!PL_restartop) {
	DEBUG_x(dump_all());
	DEBUG(PerlIO_printf(Perl_debug_log, "\nEXECUTING...\n\n"));
	DEBUG_S(PerlIO_printf(Perl_debug_log, "main thread is 0x%"UVxf"\n",
			      PTR2UV(thr)));

	if (PL_minus_c) {
#ifdef MACOS_TRADITIONAL
	    PerlIO_printf(Perl_error_log, "%s%s syntax OK\n",
		(gMacPerl_ErrorFormat ? "# " : ""),
		MacPerl_MPWFileName(PL_origfilename));
#else
	    PerlIO_printf(Perl_error_log, "%s syntax OK\n", PL_origfilename);
#endif
	    my_exit(0);
	}
	if (PERLDB_SINGLE && PL_DBsingle)
	    sv_setiv(PL_DBsingle, 1);
	if (PL_initav)
	    call_list(oldscope, PL_initav);
    }

    /* do it */

    if (PL_restartop) {
	PL_op = PL_restartop;
	PL_restartop = 0;
	CALLRUNOPS(aTHX);
    }
    else if (PL_main_start) {
	CvDEPTH(PL_main_cv) = 1;
	PL_op = PL_main_start;
	CALLRUNOPS(aTHX);
    }

    my_exit(0);
    /* NOTREACHED */
    return NULL;
}

/*
=head1 SV Manipulation Functions

=for apidoc p||get_sv

Returns the SV of the specified Perl scalar.  If C<create> is set and the
Perl variable does not exist then it will be created.  If C<create> is not
set and the variable does not exist then NULL is returned.

=cut
*/

SV*
Perl_get_sv(pTHX_ const char *name, I32 create)
{
    GV *gv;
#ifdef USE_5005THREADS
    if (name[1] == '\0' && !isALPHA(name[0])) {
	PADOFFSET tmp = find_threadsv(name);
    	if (tmp != NOT_IN_PAD)
	    return THREADSV(tmp);
    }
#endif /* USE_5005THREADS */
    gv = gv_fetchpv(name, create, SVt_PV);
    if (gv)
	return GvSV(gv);
    return Nullsv;
}

/*
=head1 Array Manipulation Functions

=for apidoc p||get_av

Returns the AV of the specified Perl array.  If C<create> is set and the
Perl variable does not exist then it will be created.  If C<create> is not
set and the variable does not exist then NULL is returned.

=cut
*/

AV*
Perl_get_av(pTHX_ const char *name, I32 create)
{
    GV* gv = gv_fetchpv(name, create, SVt_PVAV);
    if (create)
    	return GvAVn(gv);
    if (gv)
	return GvAV(gv);
    return Nullav;
}

/*
=head1 Hash Manipulation Functions

=for apidoc p||get_hv

Returns the HV of the specified Perl hash.  If C<create> is set and the
Perl variable does not exist then it will be created.  If C<create> is not
set and the variable does not exist then NULL is returned.

=cut
*/

HV*
Perl_get_hv(pTHX_ const char *name, I32 create)
{
    GV* gv = gv_fetchpv(name, create, SVt_PVHV);
    if (create)
    	return GvHVn(gv);
    if (gv)
	return GvHV(gv);
    return Nullhv;
}

/*
=head1 CV Manipulation Functions

=for apidoc p||get_cv

Returns the CV of the specified Perl subroutine.  If C<create> is set and
the Perl subroutine does not exist then it will be declared (which has the
same effect as saying C<sub name;>).  If C<create> is not set and the
subroutine does not exist then NULL is returned.

=cut
*/

CV*
Perl_get_cv(pTHX_ const char *name, I32 create)
{
    GV* gv = gv_fetchpv(name, create, SVt_PVCV);
    /* XXX unsafe for threads if eval_owner isn't held */
    /* XXX this is probably not what they think they're getting.
     * It has the same effect as "sub name;", i.e. just a forward
     * declaration! */
    if (create && !GvCVu(gv))
    	return newSUB(start_subparse(FALSE, 0),
		      newSVOP(OP_CONST, 0, newSVpv(name,0)),
		      Nullop,
		      Nullop);
    if (gv)
	return GvCVu(gv);
    return Nullcv;
}

/* Be sure to refetch the stack pointer after calling these routines. */

/*

=head1 Callback Functions

=for apidoc p||call_argv

Performs a callback to the specified Perl sub.  See L<perlcall>.

=cut
*/

I32
Perl_call_argv(pTHX_ const char *sub_name, I32 flags, register char **argv)

          		/* See G_* flags in cop.h */
                     	/* null terminated arg list */
{
    dSP;

    PUSHMARK(SP);
    if (argv) {
	while (*argv) {
	    XPUSHs(sv_2mortal(newSVpv(*argv,0)));
	    argv++;
	}
	PUTBACK;
    }
    return call_pv(sub_name, flags);
}

/*
=for apidoc p||call_pv

Performs a callback to the specified Perl sub.  See L<perlcall>.

=cut
*/

I32
Perl_call_pv(pTHX_ const char *sub_name, I32 flags)
              		/* name of the subroutine */
          		/* See G_* flags in cop.h */
{
    return call_sv((SV*)get_cv(sub_name, TRUE), flags);
}

/*
=for apidoc p||call_method

Performs a callback to the specified Perl method.  The blessed object must
be on the stack.  See L<perlcall>.

=cut
*/

I32
Perl_call_method(pTHX_ const char *methname, I32 flags)
               		/* name of the subroutine */
          		/* See G_* flags in cop.h */
{
    return call_sv(sv_2mortal(newSVpv(methname,0)), flags | G_METHOD);
}

/* May be called with any of a CV, a GV, or an SV containing the name. */
/*
=for apidoc p||call_sv

Performs a callback to the Perl sub whose name is in the SV.  See
L<perlcall>.

=cut
*/

I32
Perl_call_sv(pTHX_ SV *sv, I32 flags)
          		/* See G_* flags in cop.h */
{
    dSP;
    LOGOP myop;		/* fake syntax tree node */
    UNOP method_op;
    I32 oldmark;
    volatile I32 retval = 0;
    I32 oldscope;
    bool oldcatch = CATCH_GET;
    int ret;
    OP* oldop = PL_op;
    dJMPENV;

    if (flags & G_DISCARD) {
	ENTER;
	SAVETMPS;
    }

    Zero(&myop, 1, LOGOP);
    myop.op_next = Nullop;
    if (!(flags & G_NOARGS))
	myop.op_flags |= OPf_STACKED;
    myop.op_flags |= ((flags & G_VOID) ? OPf_WANT_VOID :
		      (flags & G_ARRAY) ? OPf_WANT_LIST :
		      OPf_WANT_SCALAR);
    SAVEOP();
    PL_op = (OP*)&myop;

    EXTEND(PL_stack_sp, 1);
    *++PL_stack_sp = sv;
    oldmark = TOPMARK;
    oldscope = PL_scopestack_ix;

    if (PERLDB_SUB && PL_curstash != PL_debstash
	   /* Handle first BEGIN of -d. */
	  && (PL_DBcv || (PL_DBcv = GvCV(PL_DBsub)))
	   /* Try harder, since this may have been a sighandler, thus
	    * curstash may be meaningless. */
	  && (SvTYPE(sv) != SVt_PVCV || CvSTASH((CV*)sv) != PL_debstash)
	  && !(flags & G_NODEBUG))
	PL_op->op_private |= OPpENTERSUB_DB;

    if (flags & G_METHOD) {
	Zero(&method_op, 1, UNOP);
	method_op.op_next = PL_op;
	method_op.op_ppaddr = PL_ppaddr[OP_METHOD];
	myop.op_ppaddr = PL_ppaddr[OP_ENTERSUB];
	PL_op = (OP*)&method_op;
    }

    if (!(flags & G_EVAL)) {
	CATCH_SET(TRUE);
	call_body((OP*)&myop, FALSE);
	retval = PL_stack_sp - (PL_stack_base + oldmark);
	CATCH_SET(oldcatch);
    }
    else {
	myop.op_other = (OP*)&myop;
	PL_markstack_ptr--;
	/* we're trying to emulate pp_entertry() here */
	{
	    register PERL_CONTEXT *cx;
	    I32 gimme = GIMME_V;
	
	    ENTER;
	    SAVETMPS;
	
	    push_return(Nullop);
	    PUSHBLOCK(cx, (CXt_EVAL|CXp_TRYBLOCK), PL_stack_sp);
	    PUSHEVAL(cx, 0, 0);
	    PL_eval_root = PL_op;             /* Only needed so that goto works right. */
	
	    PL_in_eval = EVAL_INEVAL;
	    if (flags & G_KEEPERR)
		PL_in_eval |= EVAL_KEEPERR;
	    else
		sv_setpv(ERRSV,"");
	}
	PL_markstack_ptr++;

#ifdef PERL_FLEXIBLE_EXCEPTIONS
 redo_body:
	CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_vcall_body),
		    (OP*)&myop, FALSE);
#else
	JMPENV_PUSH(ret);
#endif
	switch (ret) {
	case 0:
#ifndef PERL_FLEXIBLE_EXCEPTIONS
 redo_body:
	    call_body((OP*)&myop, FALSE);
#endif
	    retval = PL_stack_sp - (PL_stack_base + oldmark);
	    if (!(flags & G_KEEPERR))
		sv_setpv(ERRSV,"");
	    break;
	case 1:
	    STATUS_ALL_FAILURE;
	    /* FALL THROUGH */
	case 2:
	    /* my_exit() was called */
	    PL_curstash = PL_defstash;
	    FREETMPS;
	    JMPENV_POP;
	    if (PL_statusvalue && !(PL_exit_flags & PERL_EXIT_EXPECTED))
		Perl_croak(aTHX_ "Callback called exit");
	    my_exit_jump();
	    /* NOTREACHED */
	case 3:
	    if (PL_restartop) {
		PL_op = PL_restartop;
		PL_restartop = 0;
		goto redo_body;
	    }
	    PL_stack_sp = PL_stack_base + oldmark;
	    if (flags & G_ARRAY)
		retval = 0;
	    else {
		retval = 1;
		*++PL_stack_sp = &PL_sv_undef;
	    }
	    break;
	}

	if (PL_scopestack_ix > oldscope) {
	    SV **newsp;
	    PMOP *newpm;
	    I32 gimme;
	    register PERL_CONTEXT *cx;
	    I32 optype;

	    POPBLOCK(cx,newpm);
	    POPEVAL(cx);
	    pop_return();
	    PL_curpm = newpm;
	    LEAVE;
	}
	JMPENV_POP;
    }

    if (flags & G_DISCARD) {
	PL_stack_sp = PL_stack_base + oldmark;
	retval = 0;
	FREETMPS;
	LEAVE;
    }
    PL_op = oldop;
    return retval;
}

#ifdef PERL_FLEXIBLE_EXCEPTIONS
STATIC void *
S_vcall_body(pTHX_ va_list args)
{
    OP *myop = va_arg(args, OP*);
    int is_eval = va_arg(args, int);

    call_body(myop, is_eval);
    return NULL;
}
#endif

STATIC void
S_call_body(pTHX_ OP *myop, int is_eval)
{
    if (PL_op == myop) {
	if (is_eval)
	    PL_op = Perl_pp_entereval(aTHX);	/* this doesn't do a POPMARK */
	else
	    PL_op = Perl_pp_entersub(aTHX);	/* this does */
    }
    if (PL_op)
	CALLRUNOPS(aTHX);
}

/* Eval a string. The G_EVAL flag is always assumed. */

/*
=for apidoc p||eval_sv

Tells Perl to C<eval> the string in the SV.

=cut
*/

I32
Perl_eval_sv(pTHX_ SV *sv, I32 flags)

          		/* See G_* flags in cop.h */
{
    dSP;
    UNOP myop;		/* fake syntax tree node */
    volatile I32 oldmark = SP - PL_stack_base;
    volatile I32 retval = 0;
    I32 oldscope;
    int ret;
    OP* oldop = PL_op;
    dJMPENV;

    if (flags & G_DISCARD) {
	ENTER;
	SAVETMPS;
    }

    SAVEOP();
    PL_op = (OP*)&myop;
    Zero(PL_op, 1, UNOP);
    EXTEND(PL_stack_sp, 1);
    *++PL_stack_sp = sv;
    oldscope = PL_scopestack_ix;

    if (!(flags & G_NOARGS))
	myop.op_flags = OPf_STACKED;
    myop.op_next = Nullop;
    myop.op_type = OP_ENTEREVAL;
    myop.op_flags |= ((flags & G_VOID) ? OPf_WANT_VOID :
		      (flags & G_ARRAY) ? OPf_WANT_LIST :
		      OPf_WANT_SCALAR);
    if (flags & G_KEEPERR)
	myop.op_flags |= OPf_SPECIAL;

#ifdef PERL_FLEXIBLE_EXCEPTIONS
 redo_body:
    CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_vcall_body),
		(OP*)&myop, TRUE);
#else
    JMPENV_PUSH(ret);
#endif
    switch (ret) {
    case 0:
#ifndef PERL_FLEXIBLE_EXCEPTIONS
 redo_body:
	call_body((OP*)&myop,TRUE);
#endif
	retval = PL_stack_sp - (PL_stack_base + oldmark);
	if (!(flags & G_KEEPERR))
	    sv_setpv(ERRSV,"");
	break;
    case 1:
	STATUS_ALL_FAILURE;
	/* FALL THROUGH */
    case 2:
	/* my_exit() was called */
	PL_curstash = PL_defstash;
	FREETMPS;
	JMPENV_POP;
	if (PL_statusvalue && !(PL_exit_flags & PERL_EXIT_EXPECTED))
	    Perl_croak(aTHX_ "Callback called exit");
	my_exit_jump();
	/* NOTREACHED */
    case 3:
	if (PL_restartop) {
	    PL_op = PL_restartop;
	    PL_restartop = 0;
	    goto redo_body;
	}
	PL_stack_sp = PL_stack_base + oldmark;
	if (flags & G_ARRAY)
	    retval = 0;
	else {
	    retval = 1;
	    *++PL_stack_sp = &PL_sv_undef;
	}
	break;
    }

    JMPENV_POP;
    if (flags & G_DISCARD) {
	PL_stack_sp = PL_stack_base + oldmark;
	retval = 0;
	FREETMPS;
	LEAVE;
    }
    PL_op = oldop;
    return retval;
}

/*
=for apidoc p||eval_pv

Tells Perl to C<eval> the given string and return an SV* result.

=cut
*/

SV*
Perl_eval_pv(pTHX_ const char *p, I32 croak_on_error)
{
    dSP;
    SV* sv = newSVpv(p, 0);

    eval_sv(sv, G_SCALAR);
    SvREFCNT_dec(sv);

    SPAGAIN;
    sv = POPs;
    PUTBACK;

    if (croak_on_error && SvTRUE(ERRSV)) {
	STRLEN n_a;
	Perl_croak(aTHX_ SvPVx(ERRSV, n_a));
    }

    return sv;
}

/* Require a module. */

/*
=head1 Embedding Functions

=for apidoc p||require_pv

Tells Perl to C<require> the file named by the string argument.  It is
analogous to the Perl code C<eval "require '$file'">.  It's even
implemented that way; consider using Perl_load_module instead.

=cut */

void
Perl_require_pv(pTHX_ const char *pv)
{
    SV* sv;
    dSP;
    PUSHSTACKi(PERLSI_REQUIRE);
    PUTBACK;
    sv = sv_newmortal();
    sv_setpv(sv, "require '");
    sv_catpv(sv, pv);
    sv_catpv(sv, "'");
    eval_sv(sv, G_DISCARD);
    SPAGAIN;
    POPSTACK;
}

void
Perl_magicname(pTHX_ char *sym, char *name, I32 namlen)
{
    register GV *gv;

    if ((gv = gv_fetchpv(sym,TRUE, SVt_PV)))
	sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, namlen);
}

STATIC void
S_usage(pTHX_ char *name)		/* XXX move this out into a module ? */
{
    /* This message really ought to be max 23 lines.
     * Removed -h because the user already knows that option. Others? */

    static char *usage_msg[] = {
"-0[octal]       specify record separator (\\0, if no argument)",
"-a              autosplit mode with -n or -p (splits $_ into @F)",
"-C              enable native wide character system interfaces",
"-c              check syntax only (runs BEGIN and CHECK blocks)",
"-d[:debugger]   run program under debugger",
"-D[number/list] set debugging flags (argument is a bit mask or alphabets)",
"-e 'command'    one line of program (several -e's allowed, omit programfile)",
"-F/pattern/     split() pattern for -a switch (//'s are optional)",
"-i[extension]   edit <> files in place (makes backup if extension supplied)",
"-Idirectory     specify @INC/#include directory (several -I's allowed)",
"-l[octal]       enable line ending processing, specifies line terminator",
"-[mM][-]module  execute `use/no module...' before executing program",
"-n              assume 'while (<>) { ... }' loop around program",
"-p              assume loop like -n but print line also, like sed",
"-P              run program through C preprocessor before compilation",
"-s              enable rudimentary parsing for switches after programfile",
"-S              look for programfile using PATH environment variable",
"-T              enable tainting checks",
"-t              enable tainting warnings",
"-u              dump core after parsing program",
"-U              allow unsafe operations",
"-v              print version, subversion (includes VERY IMPORTANT perl info)",
"-V[:variable]   print configuration summary (or a single Config.pm variable)",
"-w              enable many useful warnings (RECOMMENDED)",
"-W              enable all warnings",
"-X              disable all warnings",
"-x[directory]   strip off text before #!perl line and perhaps cd to directory",
"\n",
NULL
};
    char **p = usage_msg;

    PerlIO_printf(PerlIO_stdout(),
		  "\nUsage: %s [switches] [--] [programfile] [arguments]",
		  name);
    while (*p)
	PerlIO_printf(PerlIO_stdout(), "\n  %s", *p++);
}

/* This routine handles any switches that can be given during run */

char *
Perl_moreswitches(pTHX_ char *s)
{
    STRLEN numlen;
    U32 rschar;

    switch (*s) {
    case '0':
    {
        I32 flags = 0;
	numlen = 4;
	rschar = (U32)grok_oct(s, &numlen, &flags, NULL);
	SvREFCNT_dec(PL_rs);
	if (rschar & ~((U8)~0))
	    PL_rs = &PL_sv_undef;
	else if (!rschar && numlen >= 2)
	    PL_rs = newSVpvn("", 0);
	else {
	    char ch = (char)rschar;
	    PL_rs = newSVpvn(&ch, 1);
	}
	return s + numlen;
    }
    case 'C':
	PL_widesyscalls = TRUE;
	s++;
	return s;
    case 'F':
	PL_minus_F = TRUE;
	PL_splitstr = ++s;
	while (*s && !isSPACE(*s)) ++s;
	*s = '\0';
	PL_splitstr = savepv(PL_splitstr);
	return s;
    case 'a':
	PL_minus_a = TRUE;
	s++;
	return s;
    case 'c':
	PL_minus_c = TRUE;
	s++;
	return s;
    case 'd':
	forbid_setid("-d");
	s++;
	/* The following permits -d:Mod to accepts arguments following an =
	   in the fashion that -MSome::Mod does. */
	if (*s == ':' || *s == '=') {
	    char *start;
	    SV *sv;
	    sv = newSVpv("use Devel::", 0);
	    start = ++s;
	    /* We now allow -d:Module=Foo,Bar */
	    while(isALNUM(*s) || *s==':') ++s;
	    if (*s != '=')
		sv_catpv(sv, start);
	    else {
		sv_catpvn(sv, start, s-start);
		sv_catpv(sv, " split(/,/,q{");
		sv_catpv(sv, ++s);
		sv_catpv(sv,    "})");
	    }
	    s += strlen(s);
	    my_setenv("PERL5DB", SvPV(sv, PL_na));
	}
	if (!PL_perldb) {
	    PL_perldb = PERLDB_ALL;
	    init_debugger();
	}
	return s;
    case 'D':
    {	
#ifdef DEBUGGING
	forbid_setid("-D");
	if (isALPHA(s[1])) {
	    /* if adding extra options, remember to update DEBUG_MASK */
	    static char debopts[] = "psltocPmfrxuLHXDSTRJ";
	    char *d;

	    for (s++; *s && (d = strchr(debopts,*s)); s++)
		PL_debug |= 1 << (d - debopts);
	}
	else {
	    PL_debug = atoi(s+1);
	    for (s++; isDIGIT(*s); s++) ;
	}
#ifdef EBCDIC
	if (DEBUG_p_TEST_ && ckWARN_d(WARN_DEBUGGING))
	    Perl_warner(aTHX_ packWARN(WARN_DEBUGGING),
		    "-Dp not implemented on this platform\n");
#endif
	PL_debug |= DEBUG_TOP_FLAG;
#else /* !DEBUGGING */
	if (ckWARN_d(WARN_DEBUGGING))
	    Perl_warner(aTHX_ packWARN(WARN_DEBUGGING),
	           "Recompile perl with -DDEBUGGING to use -D switch\n");
	for (s++; isALNUM(*s); s++) ;
#endif
	/*SUPPRESS 530*/
	return s;
    }	
    case 'h':
	usage(PL_origargv[0]);
	my_exit(0);
    case 'i':
	if (PL_inplace)
	    Safefree(PL_inplace);
#if defined(__CYGWIN__) /* do backup extension automagically */
	if (*(s+1) == '\0') {
	PL_inplace = savepv(".bak");
	return s+1;
	}
#endif /* __CYGWIN__ */
	PL_inplace = savepv(s+1);
	/*SUPPRESS 530*/
	for (s = PL_inplace; *s && !isSPACE(*s); s++) ;
	if (*s) {
	    *s++ = '\0';
	    if (*s == '-')	/* Additional switches on #! line. */
	        s++;
	}
	return s;
    case 'I':	/* -I handled both here and in parse_body() */
	forbid_setid("-I");
	++s;
	while (*s && isSPACE(*s))
	    ++s;
	if (*s) {
	    char *e, *p;
	    p = s;
	    /* ignore trailing spaces (possibly followed by other switches) */
	    do {
		for (e = p; *e && !isSPACE(*e); e++) ;
		p = e;
		while (isSPACE(*p))
		    p++;
	    } while (*p && *p != '-');
	    e = savepvn(s, e-s);
	    incpush(e, TRUE, TRUE);
	    Safefree(e);
	    s = p;
	    if (*s == '-')
		s++;
	}
	else
	    Perl_croak(aTHX_ "No directory specified for -I");
	return s;
    case 'l':
	PL_minus_l = TRUE;
	s++;
	if (PL_ors_sv) {
	    SvREFCNT_dec(PL_ors_sv);
	    PL_ors_sv = Nullsv;
	}
	if (isDIGIT(*s)) {
            I32 flags = 0;
	    PL_ors_sv = newSVpvn("\n",1);
	    numlen = 3 + (*s == '0');
	    *SvPVX(PL_ors_sv) = (char)grok_oct(s, &numlen, &flags, NULL);
	    s += numlen;
	}
	else {
	    if (RsPARA(PL_rs)) {
		PL_ors_sv = newSVpvn("\n\n",2);
	    }
	    else {
		PL_ors_sv = newSVsv(PL_rs);
	    }
	}
	return s;
    case 'M':
	forbid_setid("-M");	/* XXX ? */
	/* FALL THROUGH */
    case 'm':
	forbid_setid("-m");	/* XXX ? */
	if (*++s) {
	    char *start;
	    SV *sv;
	    char *use = "use ";
	    /* -M-foo == 'no foo'	*/
	    if (*s == '-') { use = "no "; ++s; }
	    sv = newSVpv(use,0);
	    start = s;
	    /* We allow -M'Module qw(Foo Bar)'	*/
	    while(isALNUM(*s) || *s==':') ++s;
	    if (*s != '=') {
		sv_catpv(sv, start);
		if (*(start-1) == 'm') {
		    if (*s != '\0')
			Perl_croak(aTHX_ "Can't use '%c' after -mname", *s);
		    sv_catpv( sv, " ()");
		}
	    } else {
                if (s == start)
                    Perl_croak(aTHX_ "Module name required with -%c option",
			       s[-1]);
		sv_catpvn(sv, start, s-start);
		sv_catpv(sv, " split(/,/,q{");
		sv_catpv(sv, ++s);
		sv_catpv(sv,    "})");
	    }
	    s += strlen(s);
	    if (!PL_preambleav)
		PL_preambleav = newAV();
	    av_push(PL_preambleav, sv);
	}
	else
	    Perl_croak(aTHX_ "No space allowed after -%c", *(s-1));
	return s;
    case 'n':
	PL_minus_n = TRUE;
	s++;
	return s;
    case 'p':
	PL_minus_p = TRUE;
	s++;
	return s;
    case 's':
	forbid_setid("-s");
	PL_doswitches = TRUE;
	s++;
	return s;
    case 't':
        if (!PL_tainting)
            Perl_croak(aTHX_ "Too late for \"-t\" option");
        s++;
        return s;
    case 'T':
	if (!PL_tainting)
	    Perl_croak(aTHX_ "Too late for \"-T\" option");
	s++;
	return s;
    case 'u':
#ifdef MACOS_TRADITIONAL
	Perl_croak(aTHX_ "Believe me, you don't want to use \"-u\" on a Macintosh");
#endif
	PL_do_undump = TRUE;
	s++;
	return s;
    case 'U':
	PL_unsafe = TRUE;
	s++;
	return s;
    case 'v':
#if !defined(DGUX)
	PerlIO_printf(PerlIO_stdout(),
		      Perl_form(aTHX_ "\nThis is perl, v%"VDf" built for %s",
				PL_patchlevel, ARCHNAME));
#else /* DGUX */
/* Adjust verbose output as in the perl that ships with the DG/UX OS from EMC */
	PerlIO_printf(PerlIO_stdout(),
			Perl_form(aTHX_ "\nThis is perl, version %vd\n", PL_patchlevel));
	PerlIO_printf(PerlIO_stdout(),
			Perl_form(aTHX_ "        built under %s at %s %s\n",
					OSNAME, __DATE__, __TIME__));
	PerlIO_printf(PerlIO_stdout(),
			Perl_form(aTHX_ "        OS Specific Release: %s\n",
					OSVERS));
#endif /* !DGUX */

#if defined(LOCAL_PATCH_COUNT)
	if (LOCAL_PATCH_COUNT > 0)
	    PerlIO_printf(PerlIO_stdout(),
			  "\n(with %d registered patch%s, "
			  "see perl -V for more detail)",
			  (int)LOCAL_PATCH_COUNT,
			  (LOCAL_PATCH_COUNT!=1) ? "es" : "");
#endif

	PerlIO_printf(PerlIO_stdout(),
		      "\n\nCopyright 1987-2002, Larry Wall\n");
#ifdef MACOS_TRADITIONAL
	PerlIO_printf(PerlIO_stdout(),
		      "\nMac OS port Copyright 1991-2002, Matthias Neeracher;\n"
		      "maintained by Chris Nandor\n");
#endif
#ifdef MSDOS
	PerlIO_printf(PerlIO_stdout(),
		      "\nMS-DOS port Copyright (c) 1989, 1990, Diomidis Spinellis\n");
#endif
#ifdef DJGPP
	PerlIO_printf(PerlIO_stdout(),
		      "djgpp v2 port (jpl5003c) by Hirofumi Watanabe, 1996\n"
		      "djgpp v2 port (perl5004+) by Laszlo Molnar, 1997-1999\n");
#endif
#ifdef OS2
	PerlIO_printf(PerlIO_stdout(),
		      "\n\nOS/2 port Copyright (c) 1990, 1991, Raymond Chen, Kai Uwe Rommel\n"
		      "Version 5 port Copyright (c) 1994-2002, Andreas Kaiser, Ilya Zakharevich\n");
#endif
#ifdef atarist
	PerlIO_printf(PerlIO_stdout(),
		      "atariST series port, ++jrb  bammi@cadence.com\n");
#endif
#ifdef __BEOS__
	PerlIO_printf(PerlIO_stdout(),
		      "BeOS port Copyright Tom Spindler, 1997-1999\n");
#endif
#ifdef MPE
	PerlIO_printf(PerlIO_stdout(),
		      "MPE/iX port Copyright by Mark Klein and Mark Bixby, 1996-2002\n");
#endif
#ifdef OEMVS
	PerlIO_printf(PerlIO_stdout(),
		      "MVS (OS390) port by Mortice Kern Systems, 1997-1999\n");
#endif
#ifdef __VOS__
	PerlIO_printf(PerlIO_stdout(),
		      "Stratus VOS port by Paul.Green@stratus.com, 1997-2002\n");
#endif
#ifdef __OPEN_VM
	PerlIO_printf(PerlIO_stdout(),
		      "VM/ESA port by Neale Ferguson, 1998-1999\n");
#endif
#ifdef POSIX_BC
	PerlIO_printf(PerlIO_stdout(),
		      "BS2000 (POSIX) port by Start Amadeus GmbH, 1998-1999\n");
#endif
#ifdef __MINT__
	PerlIO_printf(PerlIO_stdout(),
		      "MiNT port by Guido Flohr, 1997-1999\n");
#endif
#ifdef EPOC
	PerlIO_printf(PerlIO_stdout(),
		      "EPOC port by Olaf Flebbe, 1999-2002\n");
#endif
#ifdef UNDER_CE
	printf("WINCE port by Rainer Keuchel, 2001-2002\n");
	printf("Built on " __DATE__ " " __TIME__ "\n\n");
	wce_hitreturn();
#endif
#ifdef BINARY_BUILD_NOTICE
	BINARY_BUILD_NOTICE;
#endif
	PerlIO_printf(PerlIO_stdout(),
		      "\n\
Perl may be copied only under the terms of either the Artistic License or the\n\
GNU General Public License, which may be found in the Perl 5 source kit.\n\n\
Complete documentation for Perl, including FAQ lists, should be found on\n\
this system using `man perl' or `perldoc perl'.  If you have access to the\n\
Internet, point your browser at http://www.perl.com/, the Perl Home Page.\n\n");
	my_exit(0);
    case 'w':
	if (! (PL_dowarn & G_WARN_ALL_MASK))
	    PL_dowarn |= G_WARN_ON;
	s++;
	return s;
    case 'W':
	PL_dowarn = G_WARN_ALL_ON|G_WARN_ON;
        if (!specialWARN(PL_compiling.cop_warnings))
            SvREFCNT_dec(PL_compiling.cop_warnings);
	PL_compiling.cop_warnings = pWARN_ALL ;
	s++;
	return s;
    case 'X':
	PL_dowarn = G_WARN_ALL_OFF;
        if (!specialWARN(PL_compiling.cop_warnings))
            SvREFCNT_dec(PL_compiling.cop_warnings);
	PL_compiling.cop_warnings = pWARN_NONE ;
	s++;
	return s;
    case '*':
    case ' ':
	if (s[1] == '-')	/* Additional switches on #! line. */
	    return s+2;
	break;
    case '-':
    case 0:
#if defined(WIN32) || !defined(PERL_STRICT_CR)
    case '\r':
#endif
    case '\n':
    case '\t':
	break;
#ifdef ALTERNATE_SHEBANG
    case 'S':			/* OS/2 needs -S on "extproc" line. */
	break;
#endif
    case 'P':
	if (PL_preprocess)
	    return s+1;
	/* FALL THROUGH */
    default:
	Perl_croak(aTHX_ "Can't emulate -%.1s on #! line",s);
    }
    return Nullch;
}

/* compliments of Tom Christiansen */

/* unexec() can be found in the Gnu emacs distribution */
/* Known to work with -DUNEXEC and using unexelf.c from GNU emacs-20.2 */

void
Perl_my_unexec(pTHX)
{
#ifdef UNEXEC
    SV*    prog;
    SV*    file;
    int    status = 1;
    extern int etext;

    prog = newSVpv(BIN_EXP, 0);
    sv_catpv(prog, "/perl");
    file = newSVpv(PL_origfilename, 0);
    sv_catpv(file, ".perldump");

    unexec(SvPVX(file), SvPVX(prog), &etext, sbrk(0), 0);
    /* unexec prints msg to stderr in case of failure */
    PerlProc_exit(status);
#else
#  ifdef VMS
#    include <lib$routines.h>
     lib$signal(SS$_DEBUG);  /* ssdef.h #included from vmsish.h */
#  else
    ABORT();		/* for use with undump */
#  endif
#endif
}

/* initialize curinterp */
STATIC void
S_init_interp(pTHX)
{

#ifdef MULTIPLICITY
#  define PERLVAR(var,type)
#  define PERLVARA(var,n,type)
#  if defined(PERL_IMPLICIT_CONTEXT)
#    if defined(USE_5005THREADS)
#      define PERLVARI(var,type,init)		PERL_GET_INTERP->var = init;
#      define PERLVARIC(var,type,init)	PERL_GET_INTERP->var = init;
#    else /* !USE_5005THREADS */
#      define PERLVARI(var,type,init)		aTHX->var = init;
#      define PERLVARIC(var,type,init)	aTHX->var = init;
#    endif /* USE_5005THREADS */
#  else
#    define PERLVARI(var,type,init)	PERL_GET_INTERP->var = init;
#    define PERLVARIC(var,type,init)	PERL_GET_INTERP->var = init;
#  endif
#  include "intrpvar.h"
#  ifndef USE_5005THREADS
#    include "thrdvar.h"
#  endif
#  undef PERLVAR
#  undef PERLVARA
#  undef PERLVARI
#  undef PERLVARIC
#else
#  define PERLVAR(var,type)
#  define PERLVARA(var,n,type)
#  define PERLVARI(var,type,init)	PL_##var = init;
#  define PERLVARIC(var,type,init)	PL_##var = init;
#  include "intrpvar.h"
#  ifndef USE_5005THREADS
#    include "thrdvar.h"
#  endif
#  undef PERLVAR
#  undef PERLVARA
#  undef PERLVARI
#  undef PERLVARIC
#endif

}

STATIC void
S_init_main_stash(pTHX)
{
    GV *gv;

    PL_curstash = PL_defstash = newHV();
    PL_curstname = newSVpvn("main",4);
    gv = gv_fetchpv("main::",TRUE, SVt_PVHV);
    SvREFCNT_dec(GvHV(gv));
    GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
    SvREADONLY_on(gv);
    HvNAME(PL_defstash) = savepv("main");
    PL_incgv = gv_HVadd(gv_AVadd(gv_fetchpv("INC",TRUE, SVt_PVAV)));
    GvMULTI_on(PL_incgv);
    PL_hintgv = gv_fetchpv("\010",TRUE, SVt_PV); /* ^H */
    GvMULTI_on(PL_hintgv);
    PL_defgv = gv_fetchpv("_",TRUE, SVt_PVAV);
    PL_errgv = gv_HVadd(gv_fetchpv("@", TRUE, SVt_PV));
    GvMULTI_on(PL_errgv);
    PL_replgv = gv_fetchpv("\022", TRUE, SVt_PV); /* ^R */
    GvMULTI_on(PL_replgv);
    (void)Perl_form(aTHX_ "%240s","");	/* Preallocate temp - for immediate signals. */
    sv_grow(ERRSV, 240);	/* Preallocate - for immediate signals. */
    sv_setpvn(ERRSV, "", 0);
    PL_curstash = PL_defstash;
    CopSTASH_set(&PL_compiling, PL_defstash);
    PL_debstash = GvHV(gv_fetchpv("DB::", GV_ADDMULTI, SVt_PVHV));
    PL_globalstash = GvHV(gv_fetchpv("CORE::GLOBAL::", GV_ADDMULTI, SVt_PVHV));
    PL_nullstash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
    /* We must init $/ before switches are processed. */
    sv_setpvn(get_sv("/", TRUE), "\n", 1);
}

STATIC void
S_open_script(pTHX_ char *scriptname, bool dosearch, SV *sv, int *fdscript)
{
    char *quote;
    char *code;
    char *cpp_discard_flag;
    char *perl;

    *fdscript = -1;

    if (PL_e_script) {
	PL_origfilename = savepv("-e");
    }
    else {
	/* if find_script() returns, it returns a malloc()-ed value */
	PL_origfilename = scriptname = find_script(scriptname, dosearch, NULL, 1);

	if (strnEQ(scriptname, "/dev/fd/", 8) && isDIGIT(scriptname[8]) ) {
	    char *s = scriptname + 8;
	    *fdscript = atoi(s);
	    while (isDIGIT(*s))
		s++;
	    if (*s) {
		scriptname = savepv(s + 1);
		Safefree(PL_origfilename);
		PL_origfilename = scriptname;
	    }
	}
    }

    CopFILE_free(PL_curcop);
    CopFILE_set(PL_curcop, PL_origfilename);
    if (strEQ(PL_origfilename,"-"))
	scriptname = "";
    if (*fdscript >= 0) {
	PL_rsfp = PerlIO_fdopen(*fdscript,PERL_SCRIPT_MODE);
#       if defined(HAS_FCNTL) && defined(F_SETFD)
	    if (PL_rsfp)
                /* ensure close-on-exec */
	        fcntl(PerlIO_fileno(PL_rsfp),F_SETFD,1);
#       endif
    }
    else if (PL_preprocess) {
	char *cpp_cfg = CPPSTDIN;
	SV *cpp = newSVpvn("",0);
	SV *cmd = NEWSV(0,0);

	if (strEQ(cpp_cfg, "cppstdin"))
	    Perl_sv_catpvf(aTHX_ cpp, "%s/", BIN_EXP);
	sv_catpv(cpp, cpp_cfg);

#       ifndef VMS
	    sv_catpvn(sv, "-I", 2);
	    sv_catpv(sv,PRIVLIB_EXP);
#       endif

	DEBUG_P(PerlIO_printf(Perl_debug_log,
			      "PL_preprocess: scriptname=\"%s\", cpp=\"%s\", sv=\"%s\", CPPMINUS=\"%s\"\n",
			      scriptname, SvPVX (cpp), SvPVX (sv), CPPMINUS));

#       if defined(MSDOS) || defined(WIN32) || defined(VMS)
            quote = "\"";
#       else
            quote = "'";
#       endif

#       ifdef VMS
            cpp_discard_flag = "";
#       else
            cpp_discard_flag = "-C";
#       endif

#       ifdef OS2
            perl = os2_execname(aTHX);
#       else
            perl = PL_origargv[0];
#       endif


        /* This strips off Perl comments which might interfere with
           the C pre-processor, including #!.  #line directives are
           deliberately stripped to avoid confusion with Perl's version
           of #line.  FWP played some golf with it so it will fit
           into VMS's 255 character buffer.
        */
        if( PL_doextract )
            code = "(1../^#!.*perl/i)|/^\\s*#(?!\\s*((ifn?|un)def|(el|end)?if|define|include|else|error|pragma)\\b)/||!($|=1)||print";
        else
            code = "/^\\s*#(?!\\s*((ifn?|un)def|(el|end)?if|define|include|else|error|pragma)\\b)/||!($|=1)||print";

        Perl_sv_setpvf(aTHX_ cmd, "\
%s -ne%s%s%s %s | %"SVf" %s %"SVf" %s",
                       perl, quote, code, quote, scriptname, cpp,
                       cpp_discard_flag, sv, CPPMINUS);

	PL_doextract = FALSE;
#       ifdef IAMSUID			/* actually, this is caught earlier */
	    if (PL_euid != PL_uid && !PL_euid) {  /* if running suidperl */
#               ifdef HAS_SETEUID
	            (void)seteuid(PL_uid);	  /* musn't stay setuid root */
#               else
#               ifdef HAS_SETREUID
	            (void)setreuid((Uid_t)-1, PL_uid);
#               else
#               ifdef HAS_SETRESUID
	            (void)setresuid((Uid_t)-1, PL_uid, (Uid_t)-1);
#               else
	            PerlProc_setuid(PL_uid);
#               endif
#               endif
#               endif
	    if (PerlProc_geteuid() != PL_uid)
		Perl_croak(aTHX_ "Can't do seteuid!\n");
	}
#       endif /* IAMSUID */

        DEBUG_P(PerlIO_printf(Perl_debug_log,
                              "PL_preprocess: cmd=\"%s\"\n",
                              SvPVX(cmd)));

	PL_rsfp = PerlProc_popen(SvPVX(cmd), "r");
	SvREFCNT_dec(cmd);
	SvREFCNT_dec(cpp);
    }
    else if (!*scriptname) {
	forbid_setid("program input from stdin");
	PL_rsfp = PerlIO_stdin();
    }
    else {
	PL_rsfp = PerlIO_open(scriptname,PERL_SCRIPT_MODE);
#       if defined(HAS_FCNTL) && defined(F_SETFD)
	    if (PL_rsfp)
                /* ensure close-on-exec */
	        fcntl(PerlIO_fileno(PL_rsfp),F_SETFD,1);
#       endif
    }
    if (!PL_rsfp) {
#       ifdef DOSUID
#       ifndef IAMSUID	/* in case script is not readable before setuid */
	    if (PL_euid &&
                PerlLIO_stat(CopFILE(PL_curcop),&PL_statbuf) >= 0 &&
                PL_statbuf.st_mode & (S_ISUID|S_ISGID))
            {
                /* try again */
                PerlProc_execv(Perl_form(aTHX_ "%s/sperl"PERL_FS_VER_FMT,
                                         BIN_EXP, (int)PERL_REVISION,
                                         (int)PERL_VERSION,
                                         (int)PERL_SUBVERSION), PL_origargv);
                Perl_croak(aTHX_ "Can't do setuid\n");
            }
#       endif
#       endif
#       ifdef IAMSUID
            errno = EPERM;
            Perl_croak(aTHX_ "Can't open perl script: %s\n",
                       Strerror(errno));
#       else
            Perl_croak(aTHX_ "Can't open perl script \"%s\": %s\n",
                       CopFILE(PL_curcop), Strerror(errno));
#       endif
    }
}

/* Mention
 * I_SYSSTATVFS	HAS_FSTATVFS
 * I_SYSMOUNT
 * I_STATFS	HAS_FSTATFS	HAS_GETFSSTAT
 * I_MNTENT	HAS_GETMNTENT	HAS_HASMNTOPT
 * here so that metaconfig picks them up. */

#ifdef IAMSUID
STATIC int
S_fd_on_nosuid_fs(pTHX_ int fd)
{
    int check_okay = 0; /* able to do all the required sys/libcalls */
    int on_nosuid  = 0; /* the fd is on a nosuid fs */
/*
 * Preferred order: fstatvfs(), fstatfs(), ustat()+getmnt(), getmntent().
 * fstatvfs() is UNIX98.
 * fstatfs() is 4.3 BSD.
 * ustat()+getmnt() is pre-4.3 BSD.
 * getmntent() is O(number-of-mounted-filesystems) and can hang on
 * an irrelevant filesystem while trying to reach the right one.
 */

#undef FD_ON_NOSUID_CHECK_OKAY  /* found the syscalls to do the check? */

#   if !defined(FD_ON_NOSUID_CHECK_OKAY) && \
        defined(HAS_FSTATVFS)
#   define FD_ON_NOSUID_CHECK_OKAY
    struct statvfs stfs;

    check_okay = fstatvfs(fd, &stfs) == 0;
    on_nosuid  = check_okay && (stfs.f_flag  & ST_NOSUID);
#   endif /* fstatvfs */

#   if !defined(FD_ON_NOSUID_CHECK_OKAY) && \
        defined(PERL_MOUNT_NOSUID)	&& \
        defined(HAS_FSTATFS) 		&& \
        defined(HAS_STRUCT_STATFS)	&& \
        defined(HAS_STRUCT_STATFS_F_FLAGS)
#   define FD_ON_NOSUID_CHECK_OKAY
    struct statfs  stfs;

    check_okay = fstatfs(fd, &stfs)  == 0;
    on_nosuid  = check_okay && (stfs.f_flags & PERL_MOUNT_NOSUID);
#   endif /* fstatfs */

#   if !defined(FD_ON_NOSUID_CHECK_OKAY) && \
        defined(PERL_MOUNT_NOSUID)	&& \
        defined(HAS_FSTAT)		&& \
        defined(HAS_USTAT)		&& \
        defined(HAS_GETMNT)		&& \
        defined(HAS_STRUCT_FS_DATA)	&& \
        defined(NOSTAT_ONE)
#   define FD_ON_NOSUID_CHECK_OKAY
    Stat_t fdst;

    if (fstat(fd, &fdst) == 0) {
        struct ustat us;
        if (ustat(fdst.st_dev, &us) == 0) {
            struct fs_data fsd;
            /* NOSTAT_ONE here because we're not examining fields which
             * vary between that case and STAT_ONE. */
            if (getmnt((int*)0, &fsd, (int)0, NOSTAT_ONE, us.f_fname) == 0) {
                size_t cmplen = sizeof(us.f_fname);
                if (sizeof(fsd.fd_req.path) < cmplen)
                    cmplen = sizeof(fsd.fd_req.path);
                if (strnEQ(fsd.fd_req.path, us.f_fname, cmplen) &&
                    fdst.st_dev == fsd.fd_req.dev) {
                        check_okay = 1;
                        on_nosuid = fsd.fd_req.flags & PERL_MOUNT_NOSUID;
                    }
                }
            }
        }
    }
#   endif /* fstat+ustat+getmnt */

#   if !defined(FD_ON_NOSUID_CHECK_OKAY) && \
        defined(HAS_GETMNTENT)		&& \
        defined(HAS_HASMNTOPT)		&& \
        defined(MNTOPT_NOSUID)
#   define FD_ON_NOSUID_CHECK_OKAY
    FILE                *mtab = fopen("/etc/mtab", "r");
    struct mntent       *entry;
    Stat_t              stb, fsb;

    if (mtab && (fstat(fd, &stb) == 0)) {
        while (entry = getmntent(mtab)) {
            if (stat(entry->mnt_dir, &fsb) == 0
                && fsb.st_dev == stb.st_dev)
            {
                /* found the filesystem */
                check_okay = 1;
                if (hasmntopt(entry, MNTOPT_NOSUID))
                    on_nosuid = 1;
                break;
            } /* A single fs may well fail its stat(). */
        }
    }
    if (mtab)
        fclose(mtab);
#   endif /* getmntent+hasmntopt */

    if (!check_okay)
	Perl_croak(aTHX_ "Can't check filesystem of script \"%s\" for nosuid", PL_origfilename);
    return on_nosuid;
}
#endif /* IAMSUID */

STATIC void
S_validate_suid(pTHX_ char *validarg, char *scriptname, int fdscript)
{
#ifdef IAMSUID
    int which;
#endif

    /* do we need to emulate setuid on scripts? */

    /* This code is for those BSD systems that have setuid #! scripts disabled
     * in the kernel because of a security problem.  Merely defining DOSUID
     * in perl will not fix that problem, but if you have disabled setuid
     * scripts in the kernel, this will attempt to emulate setuid and setgid
     * on scripts that have those now-otherwise-useless bits set.  The setuid
     * root version must be called suidperl or sperlN.NNN.  If regular perl
     * discovers that it has opened a setuid script, it calls suidperl with
     * the same argv that it had.  If suidperl finds that the script it has
     * just opened is NOT setuid root, it sets the effective uid back to the
     * uid.  We don't just make perl setuid root because that loses the
     * effective uid we had before invoking perl, if it was different from the
     * uid.
     *
     * DOSUID must be defined in both perl and suidperl, and IAMSUID must
     * be defined in suidperl only.  suidperl must be setuid root.  The
     * Configure script will set this up for you if you want it.
     */

#ifdef DOSUID
    char *s, *s2;

    if (PerlLIO_fstat(PerlIO_fileno(PL_rsfp),&PL_statbuf) < 0)	/* normal stat is insecure */
	Perl_croak(aTHX_ "Can't stat script \"%s\"",PL_origfilename);
    if (fdscript < 0 && PL_statbuf.st_mode & (S_ISUID|S_ISGID)) {
	I32 len;
	STRLEN n_a;

#ifdef IAMSUID
#ifndef HAS_SETREUID
	/* On this access check to make sure the directories are readable,
	 * there is actually a small window that the user could use to make
	 * filename point to an accessible directory.  So there is a faint
	 * chance that someone could execute a setuid script down in a
	 * non-accessible directory.  I don't know what to do about that.
	 * But I don't think it's too important.  The manual lies when
	 * it says access() is useful in setuid programs.
	 */
	if (PerlLIO_access(CopFILE(PL_curcop),1)) /*double check*/
	    Perl_croak(aTHX_ "Permission denied");
#else
	/* If we can swap euid and uid, then we can determine access rights
	 * with a simple stat of the file, and then compare device and
	 * inode to make sure we did stat() on the same file we opened.
	 * Then we just have to make sure he or she can execute it.
	 */
	{
	    Stat_t tmpstatbuf;

	    if (
#ifdef HAS_SETREUID
		setreuid(PL_euid,PL_uid) < 0
#else
# if HAS_SETRESUID
		setresuid(PL_euid,PL_uid,(Uid_t)-1) < 0
# endif
#endif
		|| PerlProc_getuid() != PL_euid || PerlProc_geteuid() != PL_uid)
		Perl_croak(aTHX_ "Can't swap uid and euid");	/* really paranoid */
	    if (PerlLIO_stat(CopFILE(PL_curcop),&tmpstatbuf) < 0)
		Perl_croak(aTHX_ "Permission denied");	/* testing full pathname here */
#if defined(IAMSUID) && !defined(NO_NOSUID_CHECK)
	    if (fd_on_nosuid_fs(PerlIO_fileno(PL_rsfp)))
		Perl_croak(aTHX_ "Permission denied");
#endif
	    if (tmpstatbuf.st_dev != PL_statbuf.st_dev ||
		tmpstatbuf.st_ino != PL_statbuf.st_ino) {
		(void)PerlIO_close(PL_rsfp);
		Perl_croak(aTHX_ "Permission denied\n");
	    }
	    if (
#ifdef HAS_SETREUID
              setreuid(PL_uid,PL_euid) < 0
#else
# if defined(HAS_SETRESUID)
              setresuid(PL_uid,PL_euid,(Uid_t)-1) < 0
# endif
#endif
              || PerlProc_getuid() != PL_uid || PerlProc_geteuid() != PL_euid)
		Perl_croak(aTHX_ "Can't reswap uid and euid");
	    if (!cando(S_IXUSR,FALSE,&PL_statbuf))		/* can real uid exec? */
		Perl_croak(aTHX_ "Permission denied\n");
	}
#endif /* HAS_SETREUID */
#endif /* IAMSUID */

	if (!S_ISREG(PL_statbuf.st_mode))
	    Perl_croak(aTHX_ "Permission denied");
	if (PL_statbuf.st_mode & S_IWOTH)
	    Perl_croak(aTHX_ "Setuid/gid script is writable by world");
	PL_doswitches = FALSE;		/* -s is insecure in suid */
	CopLINE_inc(PL_curcop);
	if (sv_gets(PL_linestr, PL_rsfp, 0) == Nullch ||
	  strnNE(SvPV(PL_linestr,n_a),"#!",2) )	/* required even on Sys V */
	    Perl_croak(aTHX_ "No #! line");
	s = SvPV(PL_linestr,n_a)+2;
	if (*s == ' ') s++;
	while (!isSPACE(*s)) s++;
	for (s2 = s;  (s2 > SvPV(PL_linestr,n_a)+2 &&
		       (isDIGIT(s2[-1]) || strchr("._-", s2[-1])));  s2--) ;
	if (strnNE(s2-4,"perl",4) && strnNE(s-9,"perl",4))  /* sanity check */
	    Perl_croak(aTHX_ "Not a perl script");
	while (*s == ' ' || *s == '\t') s++;
	/*
	 * #! arg must be what we saw above.  They can invoke it by
	 * mentioning suidperl explicitly, but they may not add any strange
	 * arguments beyond what #! says if they do invoke suidperl that way.
	 */
	len = strlen(validarg);
	if (strEQ(validarg," PHOOEY ") ||
	    strnNE(s,validarg,len) || !isSPACE(s[len]))
	    Perl_croak(aTHX_ "Args must match #! line");

#ifndef IAMSUID
	if (PL_euid != PL_uid && (PL_statbuf.st_mode & S_ISUID) &&
	    PL_euid == PL_statbuf.st_uid)
	    if (!PL_do_undump)
		Perl_croak(aTHX_ "YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!\n\
FIX YOUR KERNEL, PUT A C WRAPPER AROUND THIS SCRIPT, OR USE -u AND UNDUMP!\n");
#endif /* IAMSUID */

	if (PL_euid) {	/* oops, we're not the setuid root perl */
	    (void)PerlIO_close(PL_rsfp);
#ifndef IAMSUID
	    /* try again */
	    PerlProc_execv(Perl_form(aTHX_ "%s/sperl"PERL_FS_VER_FMT, BIN_EXP,
				     (int)PERL_REVISION, (int)PERL_VERSION,
				     (int)PERL_SUBVERSION), PL_origargv);
#endif
	    Perl_croak(aTHX_ "Can't do setuid\n");
	}

	if (PL_statbuf.st_mode & S_ISGID && PL_statbuf.st_gid != PL_egid) {
#ifdef HAS_SETEGID
	    (void)setegid(PL_statbuf.st_gid);
#else
#ifdef HAS_SETREGID
           (void)setregid((Gid_t)-1,PL_statbuf.st_gid);
#else
#ifdef HAS_SETRESGID
           (void)setresgid((Gid_t)-1,PL_statbuf.st_gid,(Gid_t)-1);
#else
	    PerlProc_setgid(PL_statbuf.st_gid);
#endif
#endif
#endif
	    if (PerlProc_getegid() != PL_statbuf.st_gid)
		Perl_croak(aTHX_ "Can't do setegid!\n");
	}
	if (PL_statbuf.st_mode & S_ISUID) {
	    if (PL_statbuf.st_uid != PL_euid)
#ifdef HAS_SETEUID
		(void)seteuid(PL_statbuf.st_uid);	/* all that for this */
#else
#ifdef HAS_SETREUID
                (void)setreuid((Uid_t)-1,PL_statbuf.st_uid);
#else
#ifdef HAS_SETRESUID
                (void)setresuid((Uid_t)-1,PL_statbuf.st_uid,(Uid_t)-1);
#else
		PerlProc_setuid(PL_statbuf.st_uid);
#endif
#endif
#endif
	    if (PerlProc_geteuid() != PL_statbuf.st_uid)
		Perl_croak(aTHX_ "Can't do seteuid!\n");
	}
	else if (PL_uid) {			/* oops, mustn't run as root */
#ifdef HAS_SETEUID
          (void)seteuid((Uid_t)PL_uid);
#else
#ifdef HAS_SETREUID
          (void)setreuid((Uid_t)-1,(Uid_t)PL_uid);
#else
#ifdef HAS_SETRESUID
          (void)setresuid((Uid_t)-1,(Uid_t)PL_uid,(Uid_t)-1);
#else
          PerlProc_setuid((Uid_t)PL_uid);
#endif
#endif
#endif
	    if (PerlProc_geteuid() != PL_uid)
		Perl_croak(aTHX_ "Can't do seteuid!\n");
	}
	init_ids();
	if (!cando(S_IXUSR,TRUE,&PL_statbuf))
	    Perl_croak(aTHX_ "Permission denied\n");	/* they can't do this */
    }
#ifdef IAMSUID
    else if (PL_preprocess)
	Perl_croak(aTHX_ "-P not allowed for setuid/setgid script\n");
    else if (fdscript >= 0)
	Perl_croak(aTHX_ "fd script not allowed in suidperl\n");
    else
	Perl_croak(aTHX_ "Script is not setuid/setgid in suidperl\n");

    /* We absolutely must clear out any saved ids here, so we */
    /* exec the real perl, substituting fd script for scriptname. */
    /* (We pass script name as "subdir" of fd, which perl will grok.) */
    PerlIO_rewind(PL_rsfp);
    PerlLIO_lseek(PerlIO_fileno(PL_rsfp),(Off_t)0,0);  /* just in case rewind didn't */
    for (which = 1; PL_origargv[which] && PL_origargv[which] != scriptname; which++) ;
    if (!PL_origargv[which])
	Perl_croak(aTHX_ "Permission denied");
    PL_origargv[which] = savepv(Perl_form(aTHX_ "/dev/fd/%d/%s",
				  PerlIO_fileno(PL_rsfp), PL_origargv[which]));
#if defined(HAS_FCNTL) && defined(F_SETFD)
    fcntl(PerlIO_fileno(PL_rsfp),F_SETFD,0);	/* ensure no close-on-exec */
#endif
    PerlProc_execv(Perl_form(aTHX_ "%s/perl"PERL_FS_VER_FMT, BIN_EXP,
			     (int)PERL_REVISION, (int)PERL_VERSION,
			     (int)PERL_SUBVERSION), PL_origargv);/* try again */
    Perl_croak(aTHX_ "Can't do setuid\n");
#endif /* IAMSUID */
#else /* !DOSUID */
    if (PL_euid != PL_uid || PL_egid != PL_gid) {	/* (suidperl doesn't exist, in fact) */
#ifndef SETUID_SCRIPTS_ARE_SECURE_NOW
	PerlLIO_fstat(PerlIO_fileno(PL_rsfp),&PL_statbuf);	/* may be either wrapped or real suid */
	if ((PL_euid != PL_uid && PL_euid == PL_statbuf.st_uid && PL_statbuf.st_mode & S_ISUID)
	    ||
	    (PL_egid != PL_gid && PL_egid == PL_statbuf.st_gid && PL_statbuf.st_mode & S_ISGID)
	   )
	    if (!PL_do_undump)
		Perl_croak(aTHX_ "YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!\n\
FIX YOUR KERNEL, PUT A C WRAPPER AROUND THIS SCRIPT, OR USE -u AND UNDUMP!\n");
#endif /* SETUID_SCRIPTS_ARE_SECURE_NOW */
	/* not set-id, must be wrapped */
    }
#endif /* DOSUID */
}

STATIC void
S_find_beginning(pTHX)
{
    register char *s, *s2;

    /* skip forward in input to the real script? */

    forbid_setid("-x");
#ifdef MACOS_TRADITIONAL
    /* Since the Mac OS does not honor #! arguments for us, we do it ourselves */

    while (PL_doextract || gMacPerl_AlwaysExtract) {
	if ((s = sv_gets(PL_linestr, PL_rsfp, 0)) == Nullch) {
	    if (!gMacPerl_AlwaysExtract)
		Perl_croak(aTHX_ "No Perl script found in input\n");
		
	    if (PL_doextract)			/* require explicit override ? */
		if (!OverrideExtract(PL_origfilename))
		    Perl_croak(aTHX_ "User aborted script\n");
		else
		    PL_doextract = FALSE;
		
	    /* Pater peccavi, file does not have #! */
	    PerlIO_rewind(PL_rsfp);
	
	    break;
	}
#else
    while (PL_doextract) {
	if ((s = sv_gets(PL_linestr, PL_rsfp, 0)) == Nullch)
	    Perl_croak(aTHX_ "No Perl script found in input\n");
#endif
	s2 = s;
	if (*s == '#' && s[1] == '!' && ((s = instr(s,"perl")) || (s = instr(s2,"PERL")))) {
	    PerlIO_ungetc(PL_rsfp, '\n');		/* to keep line count right */
	    PL_doextract = FALSE;
	    while (*s && !(isSPACE (*s) || *s == '#')) s++;
	    s2 = s;
	    while (*s == ' ' || *s == '\t') s++;
	    if (*s++ == '-') {
		while (isDIGIT(s2[-1]) || strchr("-._", s2[-1])) s2--;
		if (strnEQ(s2-4,"perl",4))
		    /*SUPPRESS 530*/
		    while ((s = moreswitches(s)))
			;
	    }
#ifdef MACOS_TRADITIONAL
	    break;
#endif
	}
    }
}


STATIC void
S_init_ids(pTHX)
{
    PL_uid = PerlProc_getuid();
    PL_euid = PerlProc_geteuid();
    PL_gid = PerlProc_getgid();
    PL_egid = PerlProc_getegid();
#ifdef VMS
    PL_uid |= PL_gid << 16;
    PL_euid |= PL_egid << 16;
#endif
    PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
}

STATIC void
S_forbid_setid(pTHX_ char *s)
{
    if (PL_euid != PL_uid)
        Perl_croak(aTHX_ "No %s allowed while running setuid", s);
    if (PL_egid != PL_gid)
        Perl_croak(aTHX_ "No %s allowed while running setgid", s);
}

void
Perl_init_debugger(pTHX)
{
    HV *ostash = PL_curstash;

    PL_curstash = PL_debstash;
    PL_dbargs = GvAV(gv_AVadd((gv_fetchpv("args", GV_ADDMULTI, SVt_PVAV))));
    AvREAL_off(PL_dbargs);
    PL_DBgv = gv_fetchpv("DB", GV_ADDMULTI, SVt_PVGV);
    PL_DBline = gv_fetchpv("dbline", GV_ADDMULTI, SVt_PVAV);
    PL_DBsub = gv_HVadd(gv_fetchpv("sub", GV_ADDMULTI, SVt_PVHV));
    sv_upgrade(GvSV(PL_DBsub), SVt_IV);	/* IVX accessed if PERLDB_SUB_NN */
    PL_DBsingle = GvSV((gv_fetchpv("single", GV_ADDMULTI, SVt_PV)));
    sv_setiv(PL_DBsingle, 0);
    PL_DBtrace = GvSV((gv_fetchpv("trace", GV_ADDMULTI, SVt_PV)));
    sv_setiv(PL_DBtrace, 0);
    PL_DBsignal = GvSV((gv_fetchpv("signal", GV_ADDMULTI, SVt_PV)));
    sv_setiv(PL_DBsignal, 0);
    PL_curstash = ostash;
}

#ifndef STRESS_REALLOC
#define REASONABLE(size) (size)
#else
#define REASONABLE(size) (1) /* unreasonable */
#endif

void
Perl_init_stacks(pTHX)
{
    /* start with 128-item stack and 8K cxstack */
    PL_curstackinfo = new_stackinfo(REASONABLE(128),
				 REASONABLE(8192/sizeof(PERL_CONTEXT) - 1));
    PL_curstackinfo->si_type = PERLSI_MAIN;
    PL_curstack = PL_curstackinfo->si_stack;
    PL_mainstack = PL_curstack;		/* remember in case we switch stacks */

    PL_stack_base = AvARRAY(PL_curstack);
    PL_stack_sp = PL_stack_base;
    PL_stack_max = PL_stack_base + AvMAX(PL_curstack);

    New(50,PL_tmps_stack,REASONABLE(128),SV*);
    PL_tmps_floor = -1;
    PL_tmps_ix = -1;
    PL_tmps_max = REASONABLE(128);

    New(54,PL_markstack,REASONABLE(32),I32);
    PL_markstack_ptr = PL_markstack;
    PL_markstack_max = PL_markstack + REASONABLE(32);

    SET_MARK_OFFSET;

    New(54,PL_scopestack,REASONABLE(32),I32);
    PL_scopestack_ix = 0;
    PL_scopestack_max = REASONABLE(32);

    New(54,PL_savestack,REASONABLE(128),ANY);
    PL_savestack_ix = 0;
    PL_savestack_max = REASONABLE(128);

    New(54,PL_retstack,REASONABLE(16),OP*);
    PL_retstack_ix = 0;
    PL_retstack_max = REASONABLE(16);
}

#undef REASONABLE

STATIC void
S_nuke_stacks(pTHX)
{
    while (PL_curstackinfo->si_next)
	PL_curstackinfo = PL_curstackinfo->si_next;
    while (PL_curstackinfo) {
	PERL_SI *p = PL_curstackinfo->si_prev;
	/* curstackinfo->si_stack got nuked by sv_free_arenas() */
	Safefree(PL_curstackinfo->si_cxstack);
	Safefree(PL_curstackinfo);
	PL_curstackinfo = p;
    }
    Safefree(PL_tmps_stack);
    Safefree(PL_markstack);
    Safefree(PL_scopestack);
    Safefree(PL_savestack);
    Safefree(PL_retstack);
}

STATIC void
S_init_lexer(pTHX)
{
    PerlIO *tmpfp;
    tmpfp = PL_rsfp;
    PL_rsfp = Nullfp;
    lex_start(PL_linestr);
    PL_rsfp = tmpfp;
    PL_subname = newSVpvn("main",4);
}

STATIC void
S_init_predump_symbols(pTHX)
{
    GV *tmpgv;
    IO *io;

    sv_setpvn(get_sv("\"", TRUE), " ", 1);
    PL_stdingv = gv_fetchpv("STDIN",TRUE, SVt_PVIO);
    GvMULTI_on(PL_stdingv);
    io = GvIOp(PL_stdingv);
    IoTYPE(io) = IoTYPE_RDONLY;
    IoIFP(io) = PerlIO_stdin();
    tmpgv = gv_fetchpv("stdin",TRUE, SVt_PV);
    GvMULTI_on(tmpgv);
    GvIOp(tmpgv) = (IO*)SvREFCNT_inc(io);

    tmpgv = gv_fetchpv("STDOUT",TRUE, SVt_PVIO);
    GvMULTI_on(tmpgv);
    io = GvIOp(tmpgv);
    IoTYPE(io) = IoTYPE_WRONLY;
    IoOFP(io) = IoIFP(io) = PerlIO_stdout();
    setdefout(tmpgv);
    tmpgv = gv_fetchpv("stdout",TRUE, SVt_PV);
    GvMULTI_on(tmpgv);
    GvIOp(tmpgv) = (IO*)SvREFCNT_inc(io);

    PL_stderrgv = gv_fetchpv("STDERR",TRUE, SVt_PVIO);
    GvMULTI_on(PL_stderrgv);
    io = GvIOp(PL_stderrgv);
    IoTYPE(io) = IoTYPE_WRONLY;
    IoOFP(io) = IoIFP(io) = PerlIO_stderr();
    tmpgv = gv_fetchpv("stderr",TRUE, SVt_PV);
    GvMULTI_on(tmpgv);
    GvIOp(tmpgv) = (IO*)SvREFCNT_inc(io);

    PL_statname = NEWSV(66,0);		/* last filename we did stat on */

    if (PL_osname)
    	Safefree(PL_osname);
    PL_osname = savepv(OSNAME);
}

void
Perl_init_argv_symbols(pTHX_ register int argc, register char **argv)
{
    char *s;
    argc--,argv++;	/* skip name of script */
    if (PL_doswitches) {
	for (; argc > 0 && **argv == '-'; argc--,argv++) {
	    if (!argv[0][1])
		break;
	    if (argv[0][1] == '-' && !argv[0][2]) {
		argc--,argv++;
		break;
	    }
	    if ((s = strchr(argv[0], '='))) {
		*s++ = '\0';
		sv_setpv(GvSV(gv_fetchpv(argv[0]+1,TRUE, SVt_PV)),s);
	    }
	    else
		sv_setiv(GvSV(gv_fetchpv(argv[0]+1,TRUE, SVt_PV)),1);
	}
    }
    if ((PL_argvgv = gv_fetchpv("ARGV",TRUE, SVt_PVAV))) {
	GvMULTI_on(PL_argvgv);
	(void)gv_AVadd(PL_argvgv);
	av_clear(GvAVn(PL_argvgv));
	for (; argc > 0; argc--,argv++) {
	    SV *sv = newSVpv(argv[0],0);
	    av_push(GvAVn(PL_argvgv),sv);
	    if (PL_widesyscalls)
		(void)sv_utf8_decode(sv);
	}
    }
}

#ifdef HAS_PROCSELFEXE
/* This is a function so that we don't hold on to MAXPATHLEN
   bytes of stack longer than necessary
 */
STATIC void
S_procself_val(pTHX_ SV *sv, char *arg0)
{
    char buf[MAXPATHLEN];
    int len = readlink(PROCSELFEXE_PATH, buf, sizeof(buf) - 1);

    /* On Playstation2 Linux V1.0 (kernel 2.2.1) readlink(/proc/self/exe)
       includes a spurious NUL which will cause $^X to fail in system
       or backticks (this will prevent extensions from being built and
       many tests from working). readlink is not meant to add a NUL.
       Normal readlink works fine.
     */
    if (len > 0 && buf[len-1] == '\0') {
      len--;
    }

    /* FreeBSD's implementation is acknowledged to be imperfect, sometimes
       returning the text "unknown" from the readlink rather than the path
       to the executable (or returning an error from the readlink).  Any valid
       path has a '/' in it somewhere, so use that to validate the result.
       See http://www.freebsd.org/cgi/query-pr.cgi?pr=35703
    */
    if (len > 0 && memchr(buf, '/', len)) {
	sv_setpvn(sv,buf,len);
    }
    else {
	sv_setpv(sv,arg0);
    }
}
#endif /* HAS_PROCSELFEXE */

STATIC void
S_init_postdump_symbols(pTHX_ register int argc, register char **argv, register char **env)
{
    char *s;
    SV *sv;
    GV* tmpgv;

    PL_toptarget = NEWSV(0,0);
    sv_upgrade(PL_toptarget, SVt_PVFM);
    sv_setpvn(PL_toptarget, "", 0);
    PL_bodytarget = NEWSV(0,0);
    sv_upgrade(PL_bodytarget, SVt_PVFM);
    sv_setpvn(PL_bodytarget, "", 0);
    PL_formtarget = PL_bodytarget;

    TAINT;

    init_argv_symbols(argc,argv);

    if ((tmpgv = gv_fetchpv("0",TRUE, SVt_PV))) {
#ifdef MACOS_TRADITIONAL
	/* $0 is not majick on a Mac */
	sv_setpv(GvSV(tmpgv),MacPerl_MPWFileName(PL_origfilename));
#else
	sv_setpv(GvSV(tmpgv),PL_origfilename);
	magicname("0", "0", 1);
#endif
    }
    if ((tmpgv = gv_fetchpv("\030",TRUE, SVt_PV))) {/* $^X */
#ifdef HAS_PROCSELFEXE
	S_procself_val(aTHX_ GvSV(tmpgv), PL_origargv[0]);
#else
#ifdef OS2
	sv_setpv(GvSV(tmpgv), os2_execname(aTHX));
#else
	sv_setpv(GvSV(tmpgv),PL_origargv[0]);
#endif
#endif
    }
    if ((PL_envgv = gv_fetchpv("ENV",TRUE, SVt_PVHV))) {
	HV *hv;
	GvMULTI_on(PL_envgv);
	hv = GvHVn(PL_envgv);
	hv_magic(hv, Nullgv, PERL_MAGIC_env);
#ifdef USE_ENVIRON_ARRAY
	/* Note that if the supplied env parameter is actually a copy
	   of the global environ then it may now point to free'd memory
	   if the environment has been modified since. To avoid this
	   problem we treat env==NULL as meaning 'use the default'
	*/
	if (!env)
	    env = environ;
	if (env != environ
#  ifdef USE_ITHREADS
	    && PL_curinterp == aTHX
#  endif
	   )
	{
	    environ[0] = Nullch;
	}
	if (env)
	  for (; *env; env++) {
	    if (!(s = strchr(*env,'=')))
		continue;
#if defined(MSDOS)
	    *s = '\0';
	    (void)strupr(*env);
	    *s = '=';
#endif
	    sv = newSVpv(s+1, 0);
	    (void)hv_store(hv, *env, s - *env, sv, 0);
	    if (env != environ)
	        mg_set(sv);
	  }
#endif /* USE_ENVIRON_ARRAY */
    }
    TAINT_NOT;
    if ((tmpgv = gv_fetchpv("$",TRUE, SVt_PV))) {
        SvREADONLY_off(GvSV(tmpgv));
	sv_setiv(GvSV(tmpgv), (IV)PerlProc_getpid());
        SvREADONLY_on(GvSV(tmpgv));
    }

    /* touch @F array to prevent spurious warnings 20020415 MJD */
    if (PL_minus_a) {
      (void) get_av("main::F", TRUE | GV_ADDMULTI);
    }
    /* touch @- and @+ arrays to prevent spurious warnings 20020415 MJD */
    (void) get_av("main::-", TRUE | GV_ADDMULTI);
    (void) get_av("main::+", TRUE | GV_ADDMULTI);
}

STATIC void
S_init_perllib(pTHX)
{
    char *s;
    if (!PL_tainting) {
#ifndef VMS
	s = PerlEnv_getenv("PERL5LIB");
	if (s)
	    incpush(s, TRUE, TRUE);
	else
	    incpush(PerlEnv_getenv("PERLLIB"), FALSE, FALSE);
#else /* VMS */
	/* Treat PERL5?LIB as a possible search list logical name -- the
	 * "natural" VMS idiom for a Unix path string.  We allow each
	 * element to be a set of |-separated directories for compatibility.
	 */
	char buf[256];
	int idx = 0;
	if (my_trnlnm("PERL5LIB",buf,0))
	    do { incpush(buf,TRUE,TRUE); } while (my_trnlnm("PERL5LIB",buf,++idx));
	else
	    while (my_trnlnm("PERLLIB",buf,idx++)) incpush(buf,FALSE,FALSE);
#endif /* VMS */
    }

/* Use the ~-expanded versions of APPLLIB (undocumented),
    ARCHLIB PRIVLIB SITEARCH SITELIB VENDORARCH and VENDORLIB
*/
#ifdef APPLLIB_EXP
    incpush(APPLLIB_EXP, TRUE, TRUE);
#endif

#ifdef ARCHLIB_EXP
    incpush(ARCHLIB_EXP, FALSE, FALSE);
#endif
#ifdef MACOS_TRADITIONAL
    {
	Stat_t tmpstatbuf;
    	SV * privdir = NEWSV(55, 0);
	char * macperl = PerlEnv_getenv("MACPERL");
	
	if (!macperl)
	    macperl = "";
	
	Perl_sv_setpvf(aTHX_ privdir, "%slib:", macperl);
	if (PerlLIO_stat(SvPVX(privdir), &tmpstatbuf) >= 0 && S_ISDIR(tmpstatbuf.st_mode))
	    incpush(SvPVX(privdir), TRUE, FALSE);
	Perl_sv_setpvf(aTHX_ privdir, "%ssite_perl:", macperl);
	if (PerlLIO_stat(SvPVX(privdir), &tmpstatbuf) >= 0 && S_ISDIR(tmpstatbuf.st_mode))
	    incpush(SvPVX(privdir), TRUE, FALSE);
	
   	SvREFCNT_dec(privdir);
    }
    if (!PL_tainting)
	incpush(":", FALSE, FALSE);
#else
#ifndef PRIVLIB_EXP
#  define PRIVLIB_EXP "/usr/local/lib/perl5:/usr/local/lib/perl"
#endif
#if defined(WIN32)
    incpush(PRIVLIB_EXP, TRUE, FALSE);
#else
    incpush(PRIVLIB_EXP, FALSE, FALSE);
#endif

#ifdef SITEARCH_EXP
    /* sitearch is always relative to sitelib on Windows for
     * DLL-based path intuition to work correctly */
#  if !defined(WIN32)
    incpush(SITEARCH_EXP, FALSE, FALSE);
#  endif
#endif

#ifdef SITELIB_EXP
#  if defined(WIN32)
    incpush(SITELIB_EXP, TRUE, FALSE);	/* this picks up sitearch as well */
#  else
    incpush(SITELIB_EXP, FALSE, FALSE);
#  endif
#endif

#ifdef SITELIB_STEM /* Search for version-specific dirs below here */
    incpush(SITELIB_STEM, FALSE, TRUE);
#endif

#ifdef PERL_VENDORARCH_EXP
    /* vendorarch is always relative to vendorlib on Windows for
     * DLL-based path intuition to work correctly */
#  if !defined(WIN32)
    incpush(PERL_VENDORARCH_EXP, FALSE, FALSE);
#  endif
#endif

#ifdef PERL_VENDORLIB_EXP
#  if defined(WIN32)
    incpush(PERL_VENDORLIB_EXP, TRUE, FALSE);	/* this picks up vendorarch as well */
#  else
    incpush(PERL_VENDORLIB_EXP, FALSE, FALSE);
#  endif
#endif

#ifdef PERL_VENDORLIB_STEM /* Search for version-specific dirs below here */
    incpush(PERL_VENDORLIB_STEM, FALSE, TRUE);
#endif

#ifdef PERL_OTHERLIBDIRS
    incpush(PERL_OTHERLIBDIRS, TRUE, TRUE);
#endif

    if (!PL_tainting)
	incpush(".", FALSE, FALSE);
#endif /* MACOS_TRADITIONAL */
}

#if defined(DOSISH) || defined(EPOC)
#    define PERLLIB_SEP ';'
#else
#  if defined(VMS)
#    define PERLLIB_SEP '|'
#  else
#    if defined(MACOS_TRADITIONAL)
#      define PERLLIB_SEP ','
#    else
#      define PERLLIB_SEP ':'
#    endif
#  endif
#endif
#ifndef PERLLIB_MANGLE
#  define PERLLIB_MANGLE(s,n) (s)
#endif

STATIC void
S_incpush(pTHX_ char *p, int addsubdirs, int addoldvers)
{
    SV *subdir = Nullsv;

    if (!p || !*p)
	return;

    if (addsubdirs || addoldvers) {
	subdir = sv_newmortal();
    }

    /* Break at all separators */
    while (p && *p) {
	SV *libdir = NEWSV(55,0);
	char *s;

	/* skip any consecutive separators */
	while ( *p == PERLLIB_SEP ) {
	    /* Uncomment the next line for PATH semantics */
	    /* av_push(GvAVn(PL_incgv), newSVpvn(".", 1)); */
	    p++;
	}

	if ( (s = strchr(p, PERLLIB_SEP)) != Nullch ) {
	    sv_setpvn(libdir, PERLLIB_MANGLE(p, (STRLEN)(s - p)),
		      (STRLEN)(s - p));
	    p = s + 1;
	}
	else {
	    sv_setpv(libdir, PERLLIB_MANGLE(p, 0));
	    p = Nullch;	/* break out */
	}
#ifdef MACOS_TRADITIONAL
	if (!strchr(SvPVX(libdir), ':')) {
	    char buf[256];

	    sv_setpv(libdir, MacPerl_CanonDir(SvPVX(libdir), buf, 0));
	}
	if (SvPVX(libdir)[SvCUR(libdir)-1] != ':')
	    sv_catpv(libdir, ":");
#endif

	/*
	 * BEFORE pushing libdir onto @INC we may first push version- and
	 * archname-specific sub-directories.
	 */
	if (addsubdirs || addoldvers) {
#ifdef PERL_INC_VERSION_LIST
	    /* Configure terminates PERL_INC_VERSION_LIST with a NULL */
	    const char *incverlist[] = { PERL_INC_VERSION_LIST };
	    const char **incver;
#endif
	    Stat_t tmpstatbuf;
#ifdef VMS
	    char *unix;
	    STRLEN len;

	    if ((unix = tounixspec_ts(SvPV(libdir,len),Nullch)) != Nullch) {
		len = strlen(unix);
		while (unix[len-1] == '/') len--;  /* Cosmetic */
		sv_usepvn(libdir,unix,len);
	    }
	    else
		PerlIO_printf(Perl_error_log,
		              "Failed to unixify @INC element \"%s\"\n",
			      SvPV(libdir,len));
#endif
	    if (addsubdirs) {
#ifdef MACOS_TRADITIONAL
#define PERL_AV_SUFFIX_FMT	""
#define PERL_ARCH_FMT 		"%s:"
#define PERL_ARCH_FMT_PATH	PERL_FS_VER_FMT PERL_AV_SUFFIX_FMT
#else
#define PERL_AV_SUFFIX_FMT 	"/"
#define PERL_ARCH_FMT 		"/%s"
#define PERL_ARCH_FMT_PATH	PERL_AV_SUFFIX_FMT PERL_FS_VER_FMT
#endif
		/* .../version/archname if -d .../version/archname */
		Perl_sv_setpvf(aTHX_ subdir, "%"SVf PERL_ARCH_FMT_PATH PERL_ARCH_FMT,
				libdir,
			       (int)PERL_REVISION, (int)PERL_VERSION,
			       (int)PERL_SUBVERSION, ARCHNAME);
		if (PerlLIO_stat(SvPVX(subdir), &tmpstatbuf) >= 0 &&
		      S_ISDIR(tmpstatbuf.st_mode))
		    av_push(GvAVn(PL_incgv), newSVsv(subdir));

		/* .../version if -d .../version */
		Perl_sv_setpvf(aTHX_ subdir, "%"SVf PERL_ARCH_FMT_PATH, libdir,
			       (int)PERL_REVISION, (int)PERL_VERSION,
			       (int)PERL_SUBVERSION);
		if (PerlLIO_stat(SvPVX(subdir), &tmpstatbuf) >= 0 &&
		      S_ISDIR(tmpstatbuf.st_mode))
		    av_push(GvAVn(PL_incgv), newSVsv(subdir));

		/* .../archname if -d .../archname */
		Perl_sv_setpvf(aTHX_ subdir, "%"SVf PERL_ARCH_FMT, libdir, ARCHNAME);
		if (PerlLIO_stat(SvPVX(subdir), &tmpstatbuf) >= 0 &&
		      S_ISDIR(tmpstatbuf.st_mode))
		    av_push(GvAVn(PL_incgv), newSVsv(subdir));
	    }

#ifdef PERL_INC_VERSION_LIST
	    if (addoldvers) {
		for (incver = incverlist; *incver; incver++) {
		    /* .../xxx if -d .../xxx */
		    Perl_sv_setpvf(aTHX_ subdir, "%"SVf PERL_ARCH_FMT, libdir, *incver);
		    if (PerlLIO_stat(SvPVX(subdir), &tmpstatbuf) >= 0 &&
			  S_ISDIR(tmpstatbuf.st_mode))
			av_push(GvAVn(PL_incgv), newSVsv(subdir));
		}
	    }
#endif
	}

	/* finally push this lib directory on the end of @INC */
	av_push(GvAVn(PL_incgv), libdir);
    }
}

#ifdef USE_5005THREADS
STATIC struct perl_thread *
S_init_main_thread(pTHX)
{
#if !defined(PERL_IMPLICIT_CONTEXT)
    struct perl_thread *thr;
#endif
    XPV *xpv;

    Newz(53, thr, 1, struct perl_thread);
    PL_curcop = &PL_compiling;
    thr->interp = PERL_GET_INTERP;
    thr->cvcache = newHV();
    thr->threadsv = newAV();
    /* thr->threadsvp is set when find_threadsv is called */
    thr->specific = newAV();
    thr->flags = THRf_R_JOINABLE;
    MUTEX_INIT(&thr->mutex);
    /* Handcraft thrsv similarly to mess_sv */
    New(53, PL_thrsv, 1, SV);
    Newz(53, xpv, 1, XPV);
    SvFLAGS(PL_thrsv) = SVt_PV;
    SvANY(PL_thrsv) = (void*)xpv;
    SvREFCNT(PL_thrsv) = 1 << 30;	/* practically infinite */
    SvPVX(PL_thrsv) = (char*)thr;
    SvCUR_set(PL_thrsv, sizeof(thr));
    SvLEN_set(PL_thrsv, sizeof(thr));
    *SvEND(PL_thrsv) = '\0';	/* in the trailing_nul field */
    thr->oursv = PL_thrsv;
    PL_chopset = " \n-";
    PL_dumpindent = 4;

    MUTEX_LOCK(&PL_threads_mutex);
    PL_nthreads++;
    thr->tid = 0;
    thr->next = thr;
    thr->prev = thr;
    thr->thr_done = 0;
    MUTEX_UNLOCK(&PL_threads_mutex);

#ifdef HAVE_THREAD_INTERN
    Perl_init_thread_intern(thr);
#endif

#ifdef SET_THREAD_SELF
    SET_THREAD_SELF(thr);
#else
    thr->self = pthread_self();
#endif /* SET_THREAD_SELF */
    PERL_SET_THX(thr);

    /*
     * These must come after the thread self setting
     * because sv_setpvn does SvTAINT and the taint
     * fields thread selfness being set.
     */
    PL_toptarget = NEWSV(0,0);
    sv_upgrade(PL_toptarget, SVt_PVFM);
    sv_setpvn(PL_toptarget, "", 0);
    PL_bodytarget = NEWSV(0,0);
    sv_upgrade(PL_bodytarget, SVt_PVFM);
    sv_setpvn(PL_bodytarget, "", 0);
    PL_formtarget = PL_bodytarget;
    thr->errsv = newSVpvn("", 0);
    (void) find_threadsv("@");	/* Ensure $@ is initialised early */

    PL_maxscream = -1;
    PL_peepp = MEMBER_TO_FPTR(Perl_peep);
    PL_regcompp = MEMBER_TO_FPTR(Perl_pregcomp);
    PL_regexecp = MEMBER_TO_FPTR(Perl_regexec_flags);
    PL_regint_start = MEMBER_TO_FPTR(Perl_re_intuit_start);
    PL_regint_string = MEMBER_TO_FPTR(Perl_re_intuit_string);
    PL_regfree = MEMBER_TO_FPTR(Perl_pregfree);
    PL_regindent = 0;
    PL_reginterp_cnt = 0;

    return thr;
}
#endif /* USE_5005THREADS */

void
Perl_call_list(pTHX_ I32 oldscope, AV *paramList)
{
    SV *atsv;
    line_t oldline = CopLINE(PL_curcop);
    CV *cv;
    STRLEN len;
    int ret;
    dJMPENV;

    while (AvFILL(paramList) >= 0) {
	cv = (CV*)av_shift(paramList);
	if (PL_savebegin && (paramList == PL_beginav)) {
		/* save PL_beginav for compiler */
	    if (! PL_beginav_save)
		PL_beginav_save = newAV();
	    av_push(PL_beginav_save, (SV*)cv);
	} else {
	    SAVEFREESV(cv);
	}
#ifdef PERL_FLEXIBLE_EXCEPTIONS
	CALLPROTECT(aTHX_ pcur_env, &ret, MEMBER_TO_FPTR(S_vcall_list_body), cv);
#else
	JMPENV_PUSH(ret);
#endif
	switch (ret) {
	case 0:
#ifndef PERL_FLEXIBLE_EXCEPTIONS
	    call_list_body(cv);
#endif
	    atsv = ERRSV;
	    (void)SvPV(atsv, len);
	    if (len) {
		STRLEN n_a;
		PL_curcop = &PL_compiling;
		CopLINE_set(PL_curcop, oldline);
		if (paramList == PL_beginav)
		    sv_catpv(atsv, "BEGIN failed--compilation aborted");
		else
		    Perl_sv_catpvf(aTHX_ atsv,
				   "%s failed--call queue aborted",
				   paramList == PL_checkav ? "CHECK"
				   : paramList == PL_initav ? "INIT"
				   : "END");
		while (PL_scopestack_ix > oldscope)
		    LEAVE;
		JMPENV_POP;
		Perl_croak(aTHX_ "%s", SvPVx(atsv, n_a));
	    }
	    break;
	case 1:
	    STATUS_ALL_FAILURE;
	    /* FALL THROUGH */
	case 2:
	    /* my_exit() was called */
	    while (PL_scopestack_ix > oldscope)
		LEAVE;
	    FREETMPS;
	    PL_curstash = PL_defstash;
	    PL_curcop = &PL_compiling;
	    CopLINE_set(PL_curcop, oldline);
	    JMPENV_POP;
	    if (PL_statusvalue && !(PL_exit_flags & PERL_EXIT_EXPECTED)) {
		if (paramList == PL_beginav)
		    Perl_croak(aTHX_ "BEGIN failed--compilation aborted");
		else
		    Perl_croak(aTHX_ "%s failed--call queue aborted",
			       paramList == PL_checkav ? "CHECK"
			       : paramList == PL_initav ? "INIT"
			       : "END");
	    }
	    my_exit_jump();
	    /* NOTREACHED */
	case 3:
	    if (PL_restartop) {
		PL_curcop = &PL_compiling;
		CopLINE_set(PL_curcop, oldline);
		JMPENV_JUMP(3);
	    }
	    PerlIO_printf(Perl_error_log, "panic: restartop\n");
	    FREETMPS;
	    break;
	}
	JMPENV_POP;
    }
}

#ifdef PERL_FLEXIBLE_EXCEPTIONS
STATIC void *
S_vcall_list_body(pTHX_ va_list args)
{
    CV *cv = va_arg(args, CV*);
    return call_list_body(cv);
}
#endif

STATIC void *
S_call_list_body(pTHX_ CV *cv)
{
    PUSHMARK(PL_stack_sp);
    call_sv((SV*)cv, G_EVAL|G_DISCARD);
    return NULL;
}

void
Perl_my_exit(pTHX_ U32 status)
{
    DEBUG_S(PerlIO_printf(Perl_debug_log, "my_exit: thread %p, status %lu\n",
			  thr, (unsigned long) status));
    switch (status) {
    case 0:
	STATUS_ALL_SUCCESS;
	break;
    case 1:
	STATUS_ALL_FAILURE;
	break;
    default:
	STATUS_NATIVE_SET(status);
	break;
    }
    my_exit_jump();
}

void
Perl_my_failure_exit(pTHX)
{
#ifdef VMS
    if (vaxc$errno & 1) {
	if (STATUS_NATIVE & 1)		/* fortuitiously includes "-1" */
	    STATUS_NATIVE_SET(44);
    }
    else {
	if (!vaxc$errno && errno)	/* unlikely */
	    STATUS_NATIVE_SET(44);
	else
	    STATUS_NATIVE_SET(vaxc$errno);
    }
#else
    int exitstatus;
    if (errno & 255)
	STATUS_POSIX_SET(errno);
    else {
	exitstatus = STATUS_POSIX >> 8;
	if (exitstatus & 255)
	    STATUS_POSIX_SET(exitstatus);
	else
	    STATUS_POSIX_SET(255);
    }
#endif
    my_exit_jump();
}

STATIC void
S_my_exit_jump(pTHX)
{
    register PERL_CONTEXT *cx;
    I32 gimme;
    SV **newsp;

    if (PL_e_script) {
	SvREFCNT_dec(PL_e_script);
	PL_e_script = Nullsv;
    }

    POPSTACK_TO(PL_mainstack);
    if (cxstack_ix >= 0) {
	if (cxstack_ix > 0)
	    dounwind(0);
	POPBLOCK(cx,PL_curpm);
	LEAVE;
    }

    JMPENV_JUMP(2);
}

static I32
read_e_script(pTHX_ int idx, SV *buf_sv, int maxlen)
{
    char *p, *nl;
    p  = SvPVX(PL_e_script);
    nl = strchr(p, '\n');
    nl = (nl) ? nl+1 : SvEND(PL_e_script);
    if (nl-p == 0) {
	filter_del(read_e_script);
	return 0;
    }
    sv_catpvn(buf_sv, p, nl-p);
    sv_chop(PL_e_script, nl);
    return 1;
}