/* $OpenBSD: csh.c,v 1.36 2015/11/11 02:52:46 deraadt Exp $ */ /* $NetBSD: csh.c,v 1.14 1995/04/29 23:21:28 mycroft Exp $ */ /*- * Copyright (c) 1980, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "csh.h" #include "proc.h" #include "extern.h" #include "pathnames.h" /* * C Shell * * Bill Joy, UC Berkeley, California, USA * October 1978, May 1980 * * Jim Kulp, IIASA, Laxenburg, Austria * April 1980 * * Christos Zoulas, Cornell University * June, 1991 */ Char *dumphist[] = {STRhistory, STRmh, 0, 0}; Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0}; int nofile = 0; bool reenter = 0; bool nverbose = 0; bool nexececho = 0; bool quitit = 0; bool fast = 0; bool batch = 0; bool mflag = 0; bool prompt = 1; bool enterhist = 0; bool tellwhat = 0; extern char **environ; static int readf(void *, char *, int); static fpos_t seekf(void *, fpos_t, int); static int writef(void *, const char *, int); static int closef(void *); static int srccat(Char *, Char *); static int srcfile(char *, bool, bool); static void phup(int); static void srcunit(int, bool, bool); static void mailchk(void); static Char **defaultpath(void); int main(int argc, char *argv[]) { Char *cp; char *tcp; int f; char **tempv; struct sigaction oact; sigset_t sigset; cshin = stdin; cshout = stdout; csherr = stderr; settimes(); /* Immed. estab. timing base */ /* * Initialize non constant strings */ STR_BSHELL = SAVE(_PATH_BSHELL); STR_SHELLPATH = SAVE(_PATH_CSHELL); STR_environ = blk2short(environ); environ = short2blk(STR_environ); /* So that we can free it */ STR_WORD_CHARS = SAVE(WORD_CHARS); HIST = '!'; HISTSUB = '^'; word_chars = STR_WORD_CHARS; tempv = argv; if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ quitit = 1; uid = getuid(); gid = getgid(); euid = geteuid(); egid = getegid(); /* * We are a login shell if: 1. we were invoked as - and we had * no arguments 2. or we were invoked only with the -l flag */ loginsh = (**tempv == '-' && argc == 1) || (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && tempv[1][2] == '\0'); if (loginsh && **tempv != '-') { /* * Mangle the argv space */ tempv[1][0] = '\0'; tempv[1][1] = '\0'; tempv[1] = NULL; for (tcp = *tempv; *tcp++;) continue; for (tcp--; tcp >= *tempv; tcp--) tcp[1] = tcp[0]; *++tcp = '-'; argc--; } if (loginsh) (void) time(&chktim); if (pledge("stdio rpath wpath cpath fattr getpw proc exec tty", NULL) == -1) { perror("pledge"); exit(1); } /* * Move the descriptors to safe places. The variable didfds is 0 while we * have only FSH* to work with. When didfds is true, we have 0,1,2 and * prefer to use these. */ initdesc(); /* * XXX: This is to keep programs that use stdio happy. * what we really want is freunopen() .... * Closing cshin cshout and csherr (which are really stdin stdout * and stderr at this point and then reopening them in the same order * gives us again stdin == cshin stdout == cshout and stderr == csherr. * If that was not the case builtins like printf that use stdio * would break. But in any case we could fix that with memcpy and * a bit of pointer manipulation... * Fortunately this is not needed under the current implementation * of stdio. */ (void) fclose(cshin); (void) fclose(cshout); (void) fclose(csherr); if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef))) exit(1); if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef))) exit(1); if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef))) exit(1); (void) setvbuf(cshin, NULL, _IOLBF, 0); (void) setvbuf(cshout, NULL, _IOLBF, 0); (void) setvbuf(csherr, NULL, _IOLBF, 0); /* * Initialize the shell variables. ARGV and PROMPT are initialized later. * STATUS is also munged in several places. CHILD is munged when * forking/waiting */ set(STRstatus, Strsave(STR0)); if ((tcp = getenv("HOME")) != NULL && strlen(tcp) < PATH_MAX) cp = SAVE(tcp); else cp = NULL; if (cp == NULL) fast = 1; /* No home -> can't read scripts */ else set(STRhome, cp); dinit(cp); /* dinit thinks that HOME == cwd in a login * shell */ /* * Grab other useful things from the environment. Should we grab * everything?? */ if ((tcp = getenv("LOGNAME")) != NULL || (tcp = getenv("USER")) != NULL) set(STRuser, quote(SAVE(tcp))); if ((tcp = getenv("TERM")) != NULL) set(STRterm, quote(SAVE(tcp))); /* * Re-initialize path if set in environment */ if ((tcp = getenv("PATH")) == NULL) setq(STRpath, defaultpath(), &shvhed); else importpath(str2short(tcp)); set(STRshell, Strsave(STR_SHELLPATH)); doldol = putn((int) getpid()); /* For $$ */ /* * Record the interrupt states from the parent process. If the parent is * non-interruptible our hand must be forced or we (and our children) won't * be either. Our children inherit termination from our parent. We catch it * only if we are the login shell. */ /* parents interruptibility */ (void) sigaction(SIGINT, NULL, &oact); parintr = oact.sa_handler; (void) sigaction(SIGTERM, NULL, &oact); parterm = oact.sa_handler; /* catch these all, login shell or not */ (void) signal(SIGHUP, phup); /* exit processing on HUP */ (void) signal(SIGXCPU, phup); /* ...and on XCPU */ (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ /* * Process the arguments. * * Note that processing of -v/-x is actually delayed till after script * processing. * * We set the first character of our name to be '-' if we are a shell * running interruptible commands. Many programs which examine ps'es * use this to filter such shells out. */ argc--, tempv++; while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { do switch (*tcp++) { case 0: /* - Interruptible, no prompt */ prompt = 0; setintr = 1; nofile = 1; break; case 'b': /* -b Next arg is input file */ batch = 1; break; case 'c': /* -c Command input from arg */ if (argc == 1) xexit(0); argc--, tempv++; arginp = SAVE(tempv[0]); prompt = 0; nofile = 1; break; case 'e': /* -e Exit on any error */ exiterr = 1; break; case 'f': /* -f Fast start */ fast = 1; break; case 'i': /* -i Interactive, even if !intty */ intact = 1; nofile = 1; break; case 'm': /* -m read .cshrc (from su) */ mflag = 1; break; case 'n': /* -n Don't execute */ noexec = 1; break; case 'q': /* -q (Undoc'd) ... die on quit */ quitit = 1; break; case 's': /* -s Read from std input */ nofile = 1; break; case 't': /* -t Read one line from input */ onelflg = 2; prompt = 0; nofile = 1; break; case 'v': /* -v Echo hist expanded input */ nverbose = 1; /* ... later */ break; case 'x': /* -x Echo just before execution */ nexececho = 1; /* ... later */ break; case 'V': /* -V Echo hist expanded input */ setNS(STRverbose); /* NOW! */ break; case 'X': /* -X Echo just before execution */ setNS(STRecho); /* NOW! */ break; } while (*tcp); tempv++, argc--; } if (quitit) /* With all due haste, for debugging */ (void) signal(SIGQUIT, SIG_DFL); /* * Unless prevented by -, -c, -i, -s, or -t, if there are remaining * arguments the first of them is the name of a shell file from which to * read commands. */ if (nofile == 0 && argc > 0) { nofile = open(tempv[0], O_RDONLY); if (nofile < 0) { child = 1; /* So this doesn't return */ stderror(ERR_SYSTEM, tempv[0], strerror(errno)); } ffile = SAVE(tempv[0]); /* * Replace FSHIN. Handle /dev/std{in,out,err} specially * since once they are closed we cannot open them again. * In that case we use our own saved descriptors */ if ((SHIN = dmove(nofile, FSHIN)) < 0) switch(nofile) { case 0: SHIN = FSHIN; break; case 1: SHIN = FSHOUT; break; case 2: SHIN = FSHERR; break; default: stderror(ERR_SYSTEM, tempv[0], strerror(errno)); break; } (void) ioctl(SHIN, FIOCLEX, NULL); prompt = 0; /* argc not used any more */ tempv++; } intty = isatty(SHIN); intty |= intact; if (intty || (intact && isatty(SHOUT))) { if (!batch && (uid != euid || gid != egid)) { errno = EACCES; child = 1; /* So this doesn't return */ stderror(ERR_SYSTEM, "csh", strerror(errno)); } } /* * Decide whether we should play with signals or not. If we are explicitly * told (via -i, or -) or we are a login shell (arg0 starts with -) or the * input and output are both the ttys("csh", or "csh/dev/ttyx") * Note that in only the login shell is it likely that parent may have set * signals to be ignored */ if (loginsh || intact || (intty && isatty(SHOUT))) setintr = 1; settell(); /* * Save the remaining arguments in argv. */ setq(STRargv, blk2short(tempv), &shvhed); /* * Set up the prompt. */ if (prompt) { set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); /* that's a meta-questionmark */ set(STRprompt2, Strsave(STRmquestion)); } /* * If we are an interactive shell, then start fiddling with the signals; * this is a tricky game. */ shpgrp = getpgrp(); opgrp = tpgrp = -1; if (setintr) { **argv = '-'; if (!quitit) /* Wary! */ (void) signal(SIGQUIT, SIG_IGN); (void) signal(SIGINT, pintr); sigemptyset(&sigset); sigaddset(&sigset, SIGINT); sigprocmask(SIG_BLOCK, &sigset, NULL); (void) signal(SIGTERM, SIG_IGN); if (quitit == 0 && arginp == 0) { (void) signal(SIGTSTP, SIG_IGN); (void) signal(SIGTTIN, SIG_IGN); (void) signal(SIGTTOU, SIG_IGN); /* * Wait till in foreground, in case someone stupidly runs csh & * dont want to try to grab away the tty. */ if (isatty(FSHERR)) f = FSHERR; else if (isatty(FSHOUT)) f = FSHOUT; else if (isatty(OLDSTD)) f = OLDSTD; else f = -1; retry: if ((tpgrp = tcgetpgrp(f)) != -1) { if (tpgrp != shpgrp) { sig_t old = signal(SIGTTIN, SIG_DFL); (void) kill(0, SIGTTIN); (void) signal(SIGTTIN, old); goto retry; } opgrp = shpgrp; shpgrp = getpid(); tpgrp = shpgrp; /* * Setpgid will fail if we are a session leader and * mypid == mypgrp (POSIX 4.3.3) */ if (opgrp != shpgrp) if (setpgid(0, shpgrp) == -1) goto notty; /* * We do that after we set our process group, to make sure * that the process group belongs to a process in the same * session as the tty (our process and our group) (POSIX 7.2.4) */ if (tcsetpgrp(f, shpgrp) == -1) goto notty; (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); } if (tpgrp == -1) { notty: (void) fprintf(csherr, "Warning: no access to tty (%s).\n", strerror(errno)); (void) fprintf(csherr, "Thus no job control in this shell.\n"); } } } if ((setintr == 0) && (parintr == SIG_DFL)) setintr = 1; (void) signal(SIGCHLD, pchild); /* while signals not ready */ /* * Set an exit here in case of an interrupt or error reading the shell * start-up scripts. */ reenter = setexit(); /* PWP */ exitset++; haderr = 0; /* In case second time through */ if (!fast && reenter == 0) { /* Will have value(STRhome) here because set fast if don't */ { int osetintr = setintr; sig_t oparintr = parintr; sigset_t osigset; sigemptyset(&sigset); sigaddset(&sigset, SIGINT); sigprocmask(SIG_BLOCK, &sigset, &osigset); setintr = 0; parintr = SIG_IGN; /* Disable onintr */ (void) srcfile(_PATH_DOTCSHRC, 0, 0); if (!fast && !arginp && !onelflg) dohash(NULL, NULL); if (loginsh) (void) srcfile(_PATH_DOTLOGIN, 0, 0); sigprocmask(SIG_SETMASK, &osigset, NULL); setintr = osetintr; parintr = oparintr; } (void) srccat(value(STRhome), STRsldotcshrc); if (!fast && !arginp && !onelflg && !havhash) dohash(NULL, NULL); /* * Source history before .login so that it is available in .login */ if ((cp = value(STRhistfile)) != STRNULL) loadhist[2] = cp; dosource(loadhist, NULL); if (loginsh) (void) srccat(value(STRhome), STRsldotlogin); } /* * Now are ready for the -v and -x flags */ if (nverbose) setNS(STRverbose); if (nexececho) setNS(STRecho); /* * All the rest of the world is inside this call. The argument to process * indicates whether it should catch "error unwinds". Thus if we are a * interactive shell our call here will never return by being blown past on * an error. */ process(setintr); /* * Mop-up. */ if (intty) { if (loginsh) { (void) fprintf(cshout, "logout\n"); (void) close(SHIN); child = 1; goodbye(); } else { (void) fprintf(cshout, "exit\n"); } } rechist(); exitstat(); return (0); } void untty(void) { if (tpgrp > 0) { (void) setpgid(0, opgrp); (void) tcsetpgrp(FSHTTY, opgrp); } } void importpath(Char *cp) { int i = 0; Char *dp; Char **pv; int c; for (dp = cp; *dp; dp++) if (*dp == ':') i++; /* * i+2 where i is the number of colons in the path. There are i+1 * directories in the path plus we need room for a zero terminator. */ pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **)); dp = cp; i = 0; if (*dp) for (;;) { if ((c = *dp) == ':' || c == 0) { *dp = 0; pv[i++] = Strsave(*cp ? cp : STRdot); if (c) { cp = dp + 1; *dp = ':'; } else break; } dp++; } pv[i] = 0; setq(STRpath, pv, &shvhed); } /* * Source to the file which is the catenation of the argument names. */ static int srccat(Char *cp, Char *dp) { Char *ep = Strspl(cp, dp); char *ptr = short2str(ep); xfree(ep); return srcfile(ptr, mflag ? 0 : 1, 0); } /* * Source to a file putting the file descriptor in a safe place (> 2). */ static int srcfile(char *f, bool onlyown, bool flag) { int unit; if ((unit = open(f, O_RDONLY)) == -1) return 0; unit = dmove(unit, -1); (void) ioctl(unit, FIOCLEX, NULL); srcunit(unit, onlyown, flag); return 1; } /* * Source to a unit. If onlyown it must be our file or our group or * we don't chance it. This occurs on ".cshrc"s and the like. */ int insource; static void srcunit(int unit, bool onlyown, bool hflg) { /* We have to push down a lot of state here */ /* All this could go into a structure */ int oSHIN = -1, oldintty = intty, oinsource = insource; struct whyle *oldwhyl = whyles; Char *ogointr = gointr, *oarginp = arginp; Char *oevalp = evalp, **oevalvec = evalvec; int oonelflg = onelflg; bool oenterhist = enterhist; char OHIST = HIST; bool otell = cantell; struct Bin saveB; sigset_t sigset, osigset; jmp_buf oldexit; /* The (few) real local variables */ int my_reenter; if (unit < 0) return; if (didfds) donefds(); if (onlyown) { struct stat stb; if (fstat(unit, &stb) < 0) { (void) close(unit); return; } } /* * There is a critical section here while we are pushing down the input * stream since we have stuff in different structures. If we weren't * careful an interrupt could corrupt SHIN's Bin structure and kill the * shell. * * We could avoid the critical region by grouping all the stuff in a single * structure and pointing at it to move it all at once. This is less * efficient globally on many variable references however. */ insource = 1; getexit(oldexit); if (setintr) { sigemptyset(&sigset); sigaddset(&sigset, SIGINT); sigprocmask(SIG_BLOCK, &sigset, &osigset); } /* Setup the new values of the state stuff saved above */ memcpy(&saveB, &B, sizeof(B)); fbuf = NULL; fseekp = feobp = fblocks = 0; oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; intty = isatty(SHIN), whyles = 0, gointr = 0; evalvec = 0; evalp = 0; enterhist = hflg; if (enterhist) HIST = '\0'; /* * Now if we are allowing commands to be interrupted, we let ourselves be * interrupted. */ if (setintr) sigprocmask(SIG_SETMASK, &osigset, NULL); settell(); if ((my_reenter = setexit()) == 0) process(0); /* 0 -> blow away on errors */ if (setintr) sigprocmask(SIG_SETMASK, &osigset, NULL); if (oSHIN >= 0) { int i; /* We made it to the new state... free up its storage */ /* This code could get run twice but xfree doesn't care */ for (i = 0; i < fblocks; i++) xfree(fbuf[i]); xfree(fbuf); /* Reset input arena */ memcpy(&B, &saveB, sizeof(B)); (void) close(SHIN), SHIN = oSHIN; arginp = oarginp, onelflg = oonelflg; evalp = oevalp, evalvec = oevalvec; intty = oldintty, whyles = oldwhyl, gointr = ogointr; if (enterhist) HIST = OHIST; enterhist = oenterhist; cantell = otell; } resexit(oldexit); /* * If process reset() (effectively an unwind) then we must also unwind. */ if (my_reenter) stderror(ERR_SILENT); insource = oinsource; } void rechist(void) { Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile; int fd, ftmp, oldidfds; struct varent *shist; if (!fast) { /* * If $savehist is just set, we use the value of $history * else we use the value in $savehist */ if ((shist = adrof(STRsavehist)) != NULL) { if (shist->vec[0][0] != '\0') (void) Strlcpy(hbuf, shist->vec[0], sizeof hbuf/sizeof(Char)); else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') (void) Strlcpy(hbuf, shist->vec[0], sizeof hbuf/sizeof(Char)); else return; } else return; if ((hfile = value(STRhistfile)) == STRNULL) { Strlcpy(buf, value(STRhome), sizeof buf/sizeof(Char)); hfile = buf; (void) Strlcat(buf, STRsldthist, sizeof buf/sizeof(Char)); } if ((fd = open(short2str(hfile), O_WRONLY | O_CREAT | O_TRUNC, 0600)) == -1) return; oldidfds = didfds; didfds = 0; ftmp = SHOUT; SHOUT = fd; dumphist[2] = hbuf; dohist(dumphist, NULL); SHOUT = ftmp; (void) close(fd); didfds = oldidfds; } } void goodbye(void) { rechist(); if (loginsh) { (void) signal(SIGQUIT, SIG_IGN); (void) signal(SIGINT, SIG_IGN); (void) signal(SIGTERM, SIG_IGN); setintr = 0; /* No interrupts after "logout" */ if (!(adrof(STRlogout))) set(STRlogout, STRnormal); (void) srcfile(_PATH_DOTLOGOUT, 0, 0); if (adrof(STRhome)) (void) srccat(value(STRhome), STRsldtlogout); } exitstat(); } void exitstat(void) { Char *s; /* * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit * directly because we poke child here. Otherwise we might continue * unwarrantedly (sic). */ child = 1; s = value(STRstatus); xexit(s ? getn(s) : 0); } /* * in the event of a HUP we want to save the history */ static void phup(int sig) { /* XXX sigh, everything after this is a signal race */ rechist(); /* * We kill the last foreground process group. It then becomes * responsible to propagate the SIGHUP to its progeny. */ { struct process *pp, *np; for (pp = proclist.p_next; pp; pp = pp->p_next) { np = pp; /* * Find if this job is in the foreground. It could be that * the process leader has exited and the foreground flag * is cleared for it. */ do /* * If a process is in the foreground; we try to kill * it's process group. If we succeed, then the * whole job is gone. Otherwise we keep going... * But avoid sending HUP to the shell again. */ if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp && kill(-np->p_jobid, SIGHUP) != -1) { /* In case the job was suspended... */ (void) kill(-np->p_jobid, SIGCONT); break; } while ((np = np->p_friends) != pp); } } xexit(sig); } Char *jobargv[2] = {STRjobs, 0}; /* * Catch an interrupt, e.g. during lexical input. * If we are an interactive shell, we reset the interrupt catch * immediately. In any case we drain the shell output, * and finally go through the normal error mechanism, which * gets a chance to make the shell go away. */ /* ARGSUSED */ void pintr(int notused) { int save_errno = errno; pintr1(1); errno = save_errno; } void pintr1(bool wantnl) { Char **v; sigset_t sigset, osigset; sigemptyset(&sigset); sigprocmask(SIG_BLOCK, &sigset, &osigset); if (setintr) { sigset = osigset; sigdelset(&sigset, SIGINT); sigprocmask(SIG_SETMASK, &sigset, NULL); if (pjobs) { pjobs = 0; (void) fprintf(cshout, "\n"); dojobs(jobargv, NULL); stderror(ERR_NAME | ERR_INTR); } } sigdelset(&osigset, SIGCHLD); sigprocmask(SIG_SETMASK, &osigset, NULL); (void) fpurge(cshout); (void) endpwent(); /* * If we have an active "onintr" then we search for the label. Note that if * one does "onintr -" then we shan't be interruptible so we needn't worry * about that here. */ if (gointr) { gotolab(gointr); timflg = 0; if ((v = pargv) != NULL) pargv = 0, blkfree(v); if ((v = gargv) != NULL) gargv = 0, blkfree(v); reset(); } else if (intty && wantnl) { (void) fputc('\r', cshout); (void) fputc('\n', cshout); } stderror(ERR_SILENT); } /* * Process is the main driving routine for the shell. * It runs all command processing, except for those within { ... } * in expressions (which is run by a routine evalav in sh.exp.c which * is a stripped down process), and `...` evaluation which is run * also by a subset of this code in sh.glob.c in the routine backeval. * * The code here is a little strange because part of it is interruptible * and hence freeing of structures appears to occur when none is necessary * if this is ignored. * * Note that if catch is not set then we will unwind on any error. * If an end-of-file occurs, we return. */ static struct command *savet = NULL; void process(bool catch) { jmp_buf osetexit; struct command *t = savet; sigset_t sigset; savet = NULL; getexit(osetexit); for (;;) { pendjob(); paraml.next = paraml.prev = ¶ml; paraml.word = STRNULL; (void) setexit(); justpr = enterhist; /* execute if not entering history */ /* * Interruptible during interactive reads */ if (setintr) { sigemptyset(&sigset); sigaddset(&sigset, SIGINT); sigprocmask(SIG_UNBLOCK, &sigset, NULL); } /* * For the sake of reset() */ freelex(¶ml); if (savet) freesyn(savet), savet = NULL; if (haderr) { if (!catch) { /* unwind */ doneinp = 0; resexit(osetexit); savet = t; reset(); } haderr = 0; /* * Every error is eventually caught here or the shell dies. It is * at this point that we clean up any left-over open files, by * closing all but a fixed number of pre-defined files. Thus * routines don't have to worry about leaving files open due to * deeper errors... they will get closed here. */ closem(); continue; } if (doneinp) { doneinp = 0; break; } if (chkstop) chkstop--; if (neednote) pnote(); if (intty && prompt && evalvec == 0) { mailchk(); /* * If we are at the end of the input buffer then we are going to * read fresh stuff. Otherwise, we are rereading input and don't * need or want to prompt. */ if (aret == F_SEEK && fseekp == feobp) printprompt(); (void) fflush(cshout); } if (seterr) { xfree(seterr); seterr = NULL; } /* * Echo not only on VERBOSE, but also with history expansion. If there * is a lexical error then we forego history echo. */ if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) { prlex(csherr, ¶ml); } /* * The parser may lose space if interrupted. */ if (setintr) sigprocmask(SIG_BLOCK, &sigset, NULL); /* * Save input text on the history list if reading in old history, or it * is from the terminal at the top level and not in a loop. * * PWP: entry of items in the history list while in a while loop is done * elsewhere... */ if (enterhist || (catch && intty && !whyles)) savehist(¶ml); /* * Print lexical error messages, except when sourcing history lists. */ if (!enterhist && seterr) stderror(ERR_OLD); /* * If had a history command :p modifier then this is as far as we * should go */ if (justpr) reset(); alias(¶ml); /* * Parse the words of the input into a parse tree. */ savet = syntax(paraml.next, ¶ml, 0); if (seterr) stderror(ERR_OLD); execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); /* * Made it! */ freelex(¶ml); freesyn((struct command *) savet), savet = NULL; } resexit(osetexit); savet = t; } void /*ARGSUSED*/ dosource(Char **v, struct command *t) { Char *f; bool hflg = 0; Char buf[BUFSIZ]; char sbuf[BUFSIZ]; v++; if (*v && eq(*v, STRmh)) { if (*++v == NULL) stderror(ERR_NAME | ERR_HFLAG); hflg++; } (void) Strlcpy(buf, *v, sizeof buf/sizeof(Char)); f = globone(buf, G_ERROR); (void) strlcpy(sbuf, short2str(f), sizeof sbuf); xfree(f); if (!srcfile(sbuf, 0, hflg) && !hflg) stderror(ERR_SYSTEM, sbuf, strerror(errno)); } /* * Check for mail. * If we are a login shell, then we don't want to tell * about any mail file unless its been modified * after the time we started. * This prevents us from telling the user things he already * knows, since the login program insists on saying * "You have mail." */ static void mailchk(void) { struct varent *v; Char **vp; time_t t; int intvl, cnt; struct stat stb; bool new; v = adrof(STRmail); if (v == 0) return; (void) time(&t); vp = v->vec; cnt = blklen(vp); intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; if (intvl < 1) intvl = 1; if (chktim + intvl > t) return; for (; *vp; vp++) { if (stat(short2str(*vp), &stb) < 0) continue; new = stb.st_mtime > time0.tv_sec; if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || (stb.st_atime < chktim && stb.st_mtime < chktim) || (loginsh && !new)) continue; if (cnt == 1) (void) fprintf(cshout, "You have %smail.\n", new ? "new " : ""); else (void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", vis_str(*vp)); } chktim = t; } /* * Extract a home directory from the password file * The argument points to a buffer where the name of the * user whose home directory is sought is currently. * We write the home directory of the user back there. */ int gethdir(Char *home, int len) { Char *h; struct passwd *pw; /* * Is it us? */ if (*home == '\0') { if ((h = value(STRhome)) != NULL) { if (Strlcpy(home, h, len) >= len) return 1; return 0; } else return 1; } if ((pw = getpwnam(short2str(home))) != NULL) { if (Strlcpy(home, str2short(pw->pw_dir), len) >= len) return 1; return 0; } else return 1; } /* * When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17 * We also check if the shell has already changed the descriptor to point to * 0, 1, 2 when didfds is set. */ #define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0)) static int readf(void *oreo, char *buf, int siz) { return read(DESC(oreo), buf, siz); } static int writef(void *oreo, const char *buf, int siz) { return write(DESC(oreo), buf, siz); } static fpos_t seekf(void *oreo, fpos_t off, int whence) { return lseek(DESC(oreo), off, whence); } static int closef(void *oreo) { return close(DESC(oreo)); } /* * Print the visible version of a string. */ int vis_fputc(int ch, FILE *fp) { char uenc[5]; /* 4 + NUL */ if (ch & QUOTE) return fputc(ch & TRIM, fp); (void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0); return fputs(uenc, fp); } /* * Move the initial descriptors to their eventual * resting places, closing all other units. */ void initdesc(void) { didfds = 0; /* 0, 1, 2 aren't set up */ (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); (void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); closem(); } void xexit(int i) { untty(); _exit(i); } static Char ** defaultpath(void) { char *ptr; Char **blk, **blkp; struct stat stb; blkp = blk = xreallocarray(NULL, 10, sizeof(Char *)); #define DIRAPPEND(a) \ if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \ *blkp++ = SAVE(ptr) DIRAPPEND(_PATH_BIN); DIRAPPEND(_PATH_USRBIN); #undef DIRAPPEND *blkp = NULL; return (blk); } void printprompt(void) { Char *cp; if (!whyles) { for (cp = value(STRprompt); *cp; cp++) if (*cp == HIST) (void) fprintf(cshout, "%d", eventno + 1); else { if (*cp == '\\' && cp[1] == HIST) cp++; (void) vis_fputc(*cp | QUOTE, cshout); } } else /* * Prompt for forward reading loop body content. */ (void) fprintf(cshout, "? "); (void) fflush(cshout); }