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 18 #if !defined(lint) && !defined(LINT) 19 static char rcsid[] = "$FreeBSD: src/usr.sbin/cron/lib/compat.c,v 1.6.2.1 2000/12/11 01:03:31 obrien Exp $"; 20 #endif 21 22 /* vix 30dec93 [broke this out of misc.c - see RCS log for history] 23 * vix 15jan87 [added TIOCNOTTY, thanks csg@pyramid] 24 */ 25 26 27 #include "cron.h" 28 #ifdef NEED_GETDTABLESIZE 29 # include <limits.h> 30 #endif 31 #if defined(NEED_SETSID) && defined(BSD) 32 # include <sys/ioctl.h> 33 #endif 34 #include <errno.h> 35 #include <paths.h> 36 37 38 /* the code does not depend on any of vfork's 39 * side-effects; it just uses it as a quick 40 * fork-and-exec. 41 */ 42 #ifdef NEED_VFORK 43 PID_T 44 vfork() { 45 return (fork()); 46 } 47 #endif 48 49 50 #ifdef NEED_STRDUP 51 char * 52 strdup(str) 53 char *str; 54 { 55 char *temp; 56 57 if ((temp = malloc(strlen(str) + 1)) == NULL) { 58 errno = ENOMEM; 59 return NULL; 60 } 61 (void) strcpy(temp, str); 62 return temp; 63 } 64 #endif 65 66 67 #ifdef NEED_STRERROR 68 char * 69 strerror(error) 70 int error; 71 { 72 extern char *sys_errlist[]; 73 extern int sys_nerr; 74 static char buf[32]; 75 76 if ((error <= sys_nerr) && (error > 0)) { 77 return sys_errlist[error]; 78 } 79 80 sprintf(buf, "Unknown error: %d", error); 81 return buf; 82 } 83 #endif 84 85 86 #ifdef NEED_STRCASECMP 87 int 88 strcasecmp(left, right) 89 char *left; 90 char *right; 91 { 92 while (*left && (MkLower(*left) == MkLower(*right))) { 93 left++; 94 right++; 95 } 96 return MkLower(*left) - MkLower(*right); 97 } 98 #endif 99 100 101 #ifdef NEED_SETSID 102 int 103 setsid() 104 { 105 int newpgrp; 106 # if defined(BSD) 107 int fd; 108 # if defined(POSIX) 109 newpgrp = setpgid((pid_t)0, getpid()); 110 # else 111 newpgrp = setpgrp(0, getpid()); 112 # endif 113 if ((fd = open(_PATH_TTY, 2)) >= 0) 114 { 115 (void) ioctl(fd, TIOCNOTTY, (char*)0); 116 (void) close(fd); 117 } 118 # else /*BSD*/ 119 newpgrp = setpgrp(); 120 121 (void) close(STDIN); (void) open(_PATH_DEVNULL, 0); 122 (void) close(STDOUT); (void) open(_PATH_DEVNULL, 1); 123 (void) close(STDERR); (void) open(_PATH_DEVNULL, 2); 124 # endif /*BSD*/ 125 return newpgrp; 126 } 127 #endif /*NEED_SETSID*/ 128 129 130 #ifdef NEED_GETDTABLESIZE 131 int 132 getdtablesize() { 133 #ifdef _SC_OPEN_MAX 134 return sysconf(_SC_OPEN_MAX); 135 #else 136 return _POSIX_OPEN_MAX; 137 #endif 138 } 139 #endif 140 141 142 #ifdef NEED_FLOCK 143 /* The following flock() emulation snarfed intact *) from the HP-UX 144 * "BSD to HP-UX porting tricks" maintained by 145 * system@alchemy.chem.utoronto.ca (System Admin (Mike Peterson)) 146 * from the version "last updated: 11-Jan-1993" 147 * Snarfage done by Jarkko Hietaniemi <Jarkko.Hietaniemi@hut.fi> 148 * *) well, almost, had to K&R the function entry, HPUX "cc" 149 * does not grok ANSI function prototypes */ 150 151 /* 152 * flock (fd, operation) 153 * 154 * This routine performs some file locking like the BSD 'flock' 155 * on the object described by the int file descriptor 'fd', 156 * which must already be open. 157 * 158 * The operations that are available are: 159 * 160 * LOCK_SH - get a shared lock. 161 * LOCK_EX - get an exclusive lock. 162 * LOCK_NB - don't block (must be ORed with LOCK_SH or LOCK_EX). 163 * LOCK_UN - release a lock. 164 * 165 * Return value: 0 if lock successful, -1 if failed. 166 * 167 * Note that whether the locks are enforced or advisory is 168 * controlled by the presence or absence of the SETGID bit on 169 * the executable. 170 * 171 * Note that there is no difference between shared and exclusive 172 * locks, since the 'lockf' system call in SYSV doesn't make any 173 * distinction. 174 * 175 * The file "<sys/file.h>" should be modified to contain the definitions 176 * of the available operations, which must be added manually (see below 177 * for the values). 178 */ 179 180 /* this code has been reformatted by vixie */ 181 182 int 183 flock(fd, operation) 184 int fd; 185 int operation; 186 { 187 int i; 188 189 switch (operation) { 190 case LOCK_SH: /* get a shared lock */ 191 case LOCK_EX: /* get an exclusive lock */ 192 i = lockf (fd, F_LOCK, 0); 193 break; 194 195 case LOCK_SH|LOCK_NB: /* get a non-blocking shared lock */ 196 case LOCK_EX|LOCK_NB: /* get a non-blocking exclusive lock */ 197 i = lockf (fd, F_TLOCK, 0); 198 if (i == -1) 199 if ((errno == EAGAIN) || (errno == EACCES)) 200 errno = EWOULDBLOCK; 201 break; 202 203 case LOCK_UN: /* unlock */ 204 i = lockf (fd, F_ULOCK, 0); 205 break; 206 207 default: /* can't decipher operation */ 208 i = -1; 209 errno = EINVAL; 210 break; 211 } 212 213 return (i); 214 } 215 #endif /*NEED_FLOCK*/ 216 217 218 #ifdef NEED_SETENV 219 int 220 setenv(name, value, overwrite) 221 char *name, *value; 222 int overwrite; 223 { 224 char *tmp; 225 226 if (overwrite && getenv(name)) 227 return -1; 228 229 if (!(tmp = malloc(strlen(name) + strlen(value) + 2))) { 230 errno = ENOMEM; 231 return -1; 232 } 233 234 sprintf(tmp, "%s=%s", name, value); 235 return putenv(tmp); /* intentionally orphan 'tmp' storage */ 236 } 237 #endif 238