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/* Copyright 1988,1990,1993,1994 by Paul Vixie
* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* user.
*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
*/
#if !defined(lint) && !defined(LINT)
static char rcsid[] = "$Id: compat.c,v 1.3 2000/08/21 21:08:55 deraadt Exp $";
#endif
/* vix 30dec93 [broke this out of misc.c - see RCS log for history]
* vix 15jan87 [added TIOCNOTTY, thanks csg@pyramid]
*/
#include "cron.h"
#ifdef NEED_GETDTABLESIZE
# include <limits.h>
#endif
#if defined(NEED_SETSID) && defined(BSD)
# include <sys/ioctl.h>
#endif
#include <errno.h>
/* the code does not depend on any of vfork's
* side-effects; it just uses it as a quick
* fork-and-exec.
*/
#ifdef NEED_VFORK
PID_T
vfork() {
return (fork());
}
#endif
#ifdef NEED_STRDUP
char *
strdup(str)
char *str;
{
char *temp;
if ((temp = malloc(strlen(str) + 1)) == NULL) {
errno = ENOMEM;
return NULL;
}
(void) strcpy(temp, str);
return temp;
}
#endif
#ifdef NEED_STRERROR
char *
strerror(error)
int error;
{
extern char *sys_errlist[];
extern int sys_nerr;
static char buf[32];
if ((error <= sys_nerr) && (error > 0)) {
return sys_errlist[error];
}
snprintf(buf, sizeof buf, "Unknown error: %d", error);
return buf;
}
#endif
#ifdef NEED_STRCASECMP
int
strcasecmp(left, right)
char *left;
char *right;
{
while (*left && (MkLower(*left) == MkLower(*right))) {
left++;
right++;
}
return MkLower(*left) - MkLower(*right);
}
#endif
#ifdef NEED_SETSID
int
setsid()
{
int newpgrp;
# if defined(BSD)
int fd;
# if defined(POSIX)
newpgrp = setpgid((pid_t)0, getpid());
# else
newpgrp = setpgrp(0, getpid());
# endif
if ((fd = open("/dev/tty", 2)) >= 0)
{
(void) ioctl(fd, TIOCNOTTY, (char*)0);
(void) close(fd);
}
# else /*BSD*/
newpgrp = setpgrp();
(void) close(STDIN); (void) open("/dev/null", 0);
(void) close(STDOUT); (void) open("/dev/null", 1);
(void) close(STDERR); (void) open("/dev/null", 2);
# endif /*BSD*/
return newpgrp;
}
#endif /*NEED_SETSID*/
#ifdef NEED_GETDTABLESIZE
int
getdtablesize() {
#ifdef _SC_OPEN_MAX
return sysconf(_SC_OPEN_MAX);
#else
return _POSIX_OPEN_MAX;
#endif
}
#endif
#ifdef NEED_FLOCK
/* The following flock() emulation snarfed intact *) from the HP-UX
* "BSD to HP-UX porting tricks" maintained by
* system@alchemy.chem.utoronto.ca (System Admin (Mike Peterson))
* from the version "last updated: 11-Jan-1993"
* Snarfage done by Jarkko Hietaniemi <Jarkko.Hietaniemi@hut.fi>
* *) well, almost, had to K&R the function entry, HPUX "cc"
* does not grok ANSI function prototypes */
/*
* flock (fd, operation)
*
* This routine performs some file locking like the BSD 'flock'
* on the object described by the int file descriptor 'fd',
* which must already be open.
*
* The operations that are available are:
*
* LOCK_SH - get a shared lock.
* LOCK_EX - get an exclusive lock.
* LOCK_NB - don't block (must be ORed with LOCK_SH or LOCK_EX).
* LOCK_UN - release a lock.
*
* Return value: 0 if lock successful, -1 if failed.
*
* Note that whether the locks are enforced or advisory is
* controlled by the presence or absence of the SETGID bit on
* the executable.
*
* Note that there is no difference between shared and exclusive
* locks, since the 'lockf' system call in SYSV doesn't make any
* distinction.
*
* The file "<sys/file.h>" should be modified to contain the definitions
* of the available operations, which must be added manually (see below
* for the values).
*/
/* this code has been reformatted by vixie */
int
flock(fd, operation)
int fd;
int operation;
{
int i;
switch (operation) {
case LOCK_SH: /* get a shared lock */
case LOCK_EX: /* get an exclusive lock */
i = lockf (fd, F_LOCK, 0);
break;
case LOCK_SH|LOCK_NB: /* get a non-blocking shared lock */
case LOCK_EX|LOCK_NB: /* get a non-blocking exclusive lock */
i = lockf (fd, F_TLOCK, 0);
if (i == -1)
if ((errno == EAGAIN) || (errno == EACCES))
errno = EWOULDBLOCK;
break;
case LOCK_UN: /* unlock */
i = lockf (fd, F_ULOCK, 0);
break;
default: /* can't decipher operation */
i = -1;
errno = EINVAL;
break;
}
return (i);
}
#endif /*NEED_FLOCK*/
#ifdef NEED_SETENV
int
setenv(name, value, overwrite)
char *name, *value;
int overwrite;
{
char *tmp;
int len;
if (overwrite && getenv(name))
return -1;
len = strlen(name) + strlen(value) + 2;
if (!(tmp = malloc(len))) {
errno = ENOMEM;
return -1;
}
snprintf(tmp, len, "%s=%s", name, value);
return putenv(tmp); /* intentionally orphan 'tmp' storage */
}
#endif
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