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compat.c

/* 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 1.6 1994/01/15 20:43:43 vixie 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;

      temp = malloc(strlen(str) + 1);
      (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];
      }

      sprintf(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;

      if (overwrite && getenv(name))
            return -1;

      if (!(tmp = malloc(strlen(name) + strlen(value) + 2))) {
            errno = ENOMEM;
            return -1;
      }

      sprintf("%s=%s", name, value);
      return putenv(tmp);     /* intentionally orphan 'tmp' storage */
}
#endif

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