1 /* Copyright 1988,1990,1993,1994 by Paul Vixie
4 * Distribute freely, except: don't remove my name from the source or
5 * documentation (don't take credit for my work), mark your changes (don't
6 * get me blamed for your possible bugs), don't alter or remove this
7 * notice. May be sold if buildable source is provided to buyer. No
8 * warrantee of any kind, express or implied, is included with this
9 * software; use at your own risk, responsibility for damages (if any) to
10 * anyone resulting from the use of this software rests entirely with the
13 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
14 * I'll try to keep a version up to date. I can be reached as follows:
15 * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
17 * $FreeBSD: src/usr.sbin/cron/lib/compat.c,v 1.6.2.1 2000/12/11 01:03:31 obrien Exp $
18 * $DragonFly: src/usr.sbin/cron/lib/compat.c,v 1.4 2004/12/18 22:48:03 swildner Exp $
21 /* vix 30dec93 [broke this out of misc.c - see RCS log for history]
22 * vix 15jan87 [added TIOCNOTTY, thanks csg@pyramid]
27 #ifdef NEED_GETDTABLESIZE
30 #if defined(NEED_SETSID) && defined(BSD)
31 # include <sys/ioctl.h>
37 /* the code does not depend on any of vfork's
38 * side-effects; it just uses it as a quick
56 if ((temp = malloc(strlen(str) + 1)) == NULL) {
70 extern char *sys_errlist[];
74 if ((error <= sys_nerr) && (error > 0)) {
75 return sys_errlist[error];
78 sprintf(buf, "Unknown error: %d", error);
84 #ifdef NEED_STRCASECMP
86 strcasecmp(char *left, char *right)
88 while (*left && (MkLower(*left) == MkLower(*right))) {
92 return MkLower(*left) - MkLower(*right);
105 newpgrp = setpgid((pid_t)0, getpid());
107 newpgrp = setpgrp(0, getpid());
109 if ((fd = open(_PATH_TTY, 2)) >= 0)
111 ioctl(fd, TIOCNOTTY, (char*)0);
117 close(STDIN); open(_PATH_DEVNULL, 0);
118 close(STDOUT); open(_PATH_DEVNULL, 1);
119 close(STDERR); open(_PATH_DEVNULL, 2);
123 #endif /*NEED_SETSID*/
126 #ifdef NEED_GETDTABLESIZE
131 return sysconf(_SC_OPEN_MAX);
133 return _POSIX_OPEN_MAX;
140 /* The following flock() emulation snarfed intact *) from the HP-UX
141 * "BSD to HP-UX porting tricks" maintained by
142 * system@alchemy.chem.utoronto.ca (System Admin (Mike Peterson))
143 * from the version "last updated: 11-Jan-1993"
144 * Snarfage done by Jarkko Hietaniemi <Jarkko.Hietaniemi@hut.fi>
145 * *) well, almost, had to K&R the function entry, HPUX "cc"
146 * does not grok ANSI function prototypes */
149 * flock (fd, operation)
151 * This routine performs some file locking like the BSD 'flock'
152 * on the object described by the int file descriptor 'fd',
153 * which must already be open.
155 * The operations that are available are:
157 * LOCK_SH - get a shared lock.
158 * LOCK_EX - get an exclusive lock.
159 * LOCK_NB - don't block (must be ORed with LOCK_SH or LOCK_EX).
160 * LOCK_UN - release a lock.
162 * Return value: 0 if lock successful, -1 if failed.
164 * Note that whether the locks are enforced or advisory is
165 * controlled by the presence or absence of the SETGID bit on
168 * Note that there is no difference between shared and exclusive
169 * locks, since the 'lockf' system call in SYSV doesn't make any
172 * The file "<sys/file.h>" should be modified to contain the definitions
173 * of the available operations, which must be added manually (see below
177 /* this code has been reformatted by vixie */
180 flock(int fd, int operation)
185 case LOCK_SH: /* get a shared lock */
186 case LOCK_EX: /* get an exclusive lock */
187 i = lockf (fd, F_LOCK, 0);
190 case LOCK_SH|LOCK_NB: /* get a non-blocking shared lock */
191 case LOCK_EX|LOCK_NB: /* get a non-blocking exclusive lock */
192 i = lockf (fd, F_TLOCK, 0);
194 if ((errno == EAGAIN) || (errno == EACCES))
198 case LOCK_UN: /* unlock */
199 i = lockf (fd, F_ULOCK, 0);
202 default: /* can't decipher operation */
210 #endif /*NEED_FLOCK*/
215 setenv(char *name, char *value, int overwrite)
219 if (overwrite && getenv(name))
222 if (!(tmp = malloc(strlen(name) + strlen(value) + 2))) {
227 sprintf(tmp, "%s=%s", name, value);
228 return putenv(tmp); /* intentionally orphan 'tmp' storage */