1 /* Copyright 1988,1990,1993,1994 by Paul Vixie
2 * All rights reserved
3 *
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
11 * user.
12 *
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
16 *
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 $
19 */
20
21 /* vix 30dec93 [broke this out of misc.c - see RCS log for history]
22 * vix 15jan87 [added TIOCNOTTY, thanks csg@pyramid]
23 */
24
25
26 #include "cron.h"
27 #ifdef NEED_GETDTABLESIZE
28 # include <limits.h>
29 #endif
30 #if defined(NEED_SETSID) && defined(BSD)
31 # include <sys/ioctl.h>
32 #endif
33 #include <errno.h>
34 #include <paths.h>
35
36
37 /* the code does not depend on any of vfork's
38 * side-effects; it just uses it as a quick
39 * fork-and-exec.
40 */
41 #ifdef NEED_VFORK
42 PID_T
vfork(void)43 vfork(void)
44 {
45 return (fork());
46 }
47 #endif
48
49
50 #ifdef NEED_STRDUP
51 char *
strdup(char * str)52 strdup(char *str)
53 {
54 char *temp;
55
56 if ((temp = malloc(strlen(str) + 1)) == NULL) {
57 errno = ENOMEM;
58 return NULL;
59 }
60 strcpy(temp, str);
61 return temp;
62 }
63 #endif
64
65
66 #ifdef NEED_STRERROR
67 char *
strerror(int error)68 strerror(int error)
69 {
70 extern char *sys_errlist[];
71 extern int sys_nerr;
72 static char buf[32];
73
74 if ((error <= sys_nerr) && (error > 0)) {
75 return sys_errlist[error];
76 }
77
78 sprintf(buf, "Unknown error: %d", error);
79 return buf;
80 }
81 #endif
82
83
84 #ifdef NEED_STRCASECMP
85 int
strcasecmp(char * left,char * right)86 strcasecmp(char *left, char *right)
87 {
88 while (*left && (MkLower(*left) == MkLower(*right))) {
89 left++;
90 right++;
91 }
92 return MkLower(*left) - MkLower(*right);
93 }
94 #endif
95
96
97 #ifdef NEED_SETSID
98 int
setsid(void)99 setsid(void)
100 {
101 int newpgrp;
102 # if defined(BSD)
103 int fd;
104 # if defined(POSIX)
105 newpgrp = setpgid((pid_t)0, getpid());
106 # else
107 newpgrp = setpgrp(0, getpid());
108 # endif
109 if ((fd = open(_PATH_TTY, 2)) >= 0)
110 {
111 ioctl(fd, TIOCNOTTY, NULL);
112 close(fd);
113 }
114 # else /*BSD*/
115 newpgrp = setpgrp();
116
117 close(STDIN); open(_PATH_DEVNULL, 0);
118 close(STDOUT); open(_PATH_DEVNULL, 1);
119 close(STDERR); open(_PATH_DEVNULL, 2);
120 # endif /*BSD*/
121 return newpgrp;
122 }
123 #endif /*NEED_SETSID*/
124
125
126 #ifdef NEED_GETDTABLESIZE
127 int
getdtablesize(void)128 getdtablesize(void)
129 {
130 #ifdef _SC_OPEN_MAX
131 return sysconf(_SC_OPEN_MAX);
132 #else
133 return _POSIX_OPEN_MAX;
134 #endif
135 }
136 #endif
137
138
139 #ifdef NEED_FLOCK
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 */
147
148 /*
149 * flock (fd, operation)
150 *
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.
154 *
155 * The operations that are available are:
156 *
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.
161 *
162 * Return value: 0 if lock successful, -1 if failed.
163 *
164 * Note that whether the locks are enforced or advisory is
165 * controlled by the presence or absence of the SETGID bit on
166 * the executable.
167 *
168 * Note that there is no difference between shared and exclusive
169 * locks, since the 'lockf' system call in SYSV doesn't make any
170 * distinction.
171 *
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
174 * for the values).
175 */
176
177 /* this code has been reformatted by vixie */
178
179 int
flock(int fd,int operation)180 flock(int fd, int operation)
181 {
182 int i;
183
184 switch (operation) {
185 case LOCK_SH: /* get a shared lock */
186 case LOCK_EX: /* get an exclusive lock */
187 i = lockf (fd, F_LOCK, 0);
188 break;
189
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);
193 if (i == -1)
194 if ((errno == EAGAIN) || (errno == EACCES))
195 errno = EWOULDBLOCK;
196 break;
197
198 case LOCK_UN: /* unlock */
199 i = lockf (fd, F_ULOCK, 0);
200 break;
201
202 default: /* can't decipher operation */
203 i = -1;
204 errno = EINVAL;
205 break;
206 }
207
208 return (i);
209 }
210 #endif /*NEED_FLOCK*/
211
212
213 #ifdef NEED_SETENV
214 int
setenv(char * name,char * value,int overwrite)215 setenv(char *name, char *value, int overwrite)
216 {
217 char *tmp;
218
219 if (overwrite && getenv(name))
220 return -1;
221
222 if (!(tmp = malloc(strlen(name) + strlen(value) + 2))) {
223 errno = ENOMEM;
224 return -1;
225 }
226
227 sprintf(tmp, "%s=%s", name, value);
228 return putenv(tmp); /* intentionally orphan 'tmp' storage */
229 }
230 #endif
231