2 process.c -- process management functions
3 Copyright (C) 1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000 Guus Sliepen <guus@sliepen.warande.net>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: process.c,v 1.1.2.2 2000/11/16 22:12:23 zarq Exp $
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
46 /* A list containing all our children */
49 /* If zero, don't detach from the terminal. */
54 extern char *identname;
55 extern char *pidfilename;
58 void memory_full(int size)
60 syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size);
66 Close network connections, and terminate neatly
68 void cleanup_and_exit(int c)
70 close_network_connections();
72 if(debug_lvl > DEBUG_NOTHING)
73 syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"),
74 total_tap_out, total_socket_out, total_tap_in, total_socket_in);
82 check for an existing tinc for this net, and write pid to pidfile
84 int write_pidfile(void)
88 if((pid = check_pid(pidfilename)))
91 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
94 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
98 /* if it's locked, write-protected, or whatever */
99 if(!write_pid(pidfilename))
106 kill older tincd for this net
112 if(!(pid = read_pid(pidfilename)))
115 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
117 fprintf(stderr, _("No other tincd is running.\n"));
121 errno = 0; /* No error, sometimes errno is only changed on error */
122 /* ESRCH is returned when no process with that pid is found */
123 if(kill(pid, SIGTERM) && errno == ESRCH)
124 fprintf(stderr, _("Removing stale lock file.\n"));
125 remove_pid(pidfilename);
131 Detach from current terminal, write pidfile, kill parent
144 if((pid = fork()) < 0)
149 if(pid) /* parent process */
151 signal(SIGTERM, parent_exit);
152 sleep(600); /* wait 10 minutes */
162 if((fd = open("/dev/tty", O_RDWR)) >= 0)
164 if(ioctl(fd, TIOCNOTTY, NULL))
178 chdir("/"); /* avoid keeping a mointpoint busy */
180 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
182 if(debug_lvl > DEBUG_NOTHING)
183 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
184 VERSION, __DATE__, __TIME__, debug_lvl);
186 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
188 xalloc_fail_func = memory_full;
194 Execute the program name, with sane environment. All output will be
195 redirected to syslog.
197 void _execute_script(const char *name) __attribute__ ((noreturn));
198 void _execute_script(const char *name)
206 asprintf(&s, "NETNAME=%s", netname);
207 putenv(s); /* Don't free s! see man 3 putenv */
216 if(chdir(confbase) < 0)
217 /* This cannot fail since we already read config files from this
219 /* Yes this can fail, somebody could have removed this directory
220 when we didn't pay attention. - Ivo */
223 /* Now if THIS fails, something wicked is going on. - Ivo */
224 syslog(LOG_ERR, _("Couldn't chdir to `/': %m"));
226 /* Continue anyway. */
229 asprintf(&scriptname, "%s/%s", confbase, name);
231 /* Close all file descriptors */
235 /* Open standard input */
236 if(open("/dev/null", O_RDONLY) < 0)
238 syslog(LOG_ERR, _("Opening `/dev/null' failed: %m"));
244 /* Standard output directly goes to syslog */
245 openlog(name, LOG_CONS | LOG_PID, LOG_DAEMON);
246 /* Standard error as well */
249 syslog(LOG_ERR, _("System call `%s' failed: %m"),
255 if(error && debug_lvl > 1)
256 syslog(LOG_INFO, _("This means that any output the script generates will not be shown in syslog."));
258 execl(scriptname, NULL);
259 /* No return on success */
261 if(errno != ENOENT) /* Ignore if the file does not exist */
262 syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname);
264 /* No need to free things */
269 Fork and execute the program pointed to by name.
271 int execute_script(const char *name)
275 if((pid = fork()) < 0)
277 syslog(LOG_ERR, _("System call `%s' failed: %m"),
284 list_append(child_pids, (void*)(int)pid);
289 _execute_script(name);
293 Check a child (the pointer data is actually an integer, the PID of
294 that child. A non-zero return value means that the child has exited
295 and can be removed from our list.
297 int check_child(void *data)
303 pid = waitpid(pid, &status, WNOHANG);
304 if(WIFEXITED(status))
306 if(WIFSIGNALED(status)) /* Child was killed by a signal */
308 syslog(LOG_ERR, _("Child with PID %d was killed by signal %d (%s)"),
309 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
312 if(WEXITSTATUS(status) != 0)
314 syslog(LOG_INFO, _("Child with PID %d exited with code %d"),
315 WEXITSTATUS(status));
320 /* Child is still running */
325 Check the status of all our children.
327 void check_children(void)
329 list_forall_nodes(child_pids, check_child);
338 sigterm_handler(int a)
340 if(debug_lvl > DEBUG_NOTHING)
341 syslog(LOG_NOTICE, _("Got TERM signal"));
347 sigquit_handler(int a)
349 if(debug_lvl > DEBUG_NOTHING)
350 syslog(LOG_NOTICE, _("Got QUIT signal"));
355 sigsegv_square(int a)
357 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
362 sigsegv_handler(int a)
364 syslog(LOG_ERR, _("Got SEGV signal"));
369 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
370 signal(SIGSEGV, sigsegv_square);
371 close_network_connections();
373 remove_pid(pidfilename);
374 execvp(g_argv[0], g_argv);
378 syslog(LOG_NOTICE, _("Not restarting."));
384 sighup_handler(int a)
386 if(debug_lvl > DEBUG_NOTHING)
387 syslog(LOG_NOTICE, _("Got HUP signal"));
392 sigint_handler(int a)
394 if(debug_lvl > DEBUG_NOTHING)
395 syslog(LOG_NOTICE, _("Got INT signal, exiting"));
400 sigusr1_handler(int a)
406 sigusr2_handler(int a)
414 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
426 if(signal(SIGTERM, SIG_IGN) != SIG_ERR)
427 signal(SIGTERM, sigterm_handler);
428 if(signal(SIGQUIT, SIG_IGN) != SIG_ERR)
429 signal(SIGQUIT, sigquit_handler);
430 if(signal(SIGSEGV, SIG_IGN) != SIG_ERR)
431 signal(SIGSEGV, sigsegv_handler);
432 if(signal(SIGHUP, SIG_IGN) != SIG_ERR)
433 signal(SIGHUP, sighup_handler);
434 signal(SIGPIPE, SIG_IGN);
435 if(signal(SIGINT, SIG_IGN) != SIG_ERR)
436 signal(SIGINT, sigint_handler);
437 signal(SIGUSR1, sigusr1_handler);
438 signal(SIGUSR2, sigusr2_handler);
439 signal(SIGCHLD, SIG_IGN);
442 RETSIGTYPE parent_exit(int a)