2 process.c -- process management functions
3 Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
4 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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 1.1.2.53 2003/07/11 16:13:00 guus Exp $
30 #include <sys/ioctl.h>
31 #include <sys/types.h>
46 #include "connection.h"
52 /* If zero, don't detach from the terminal. */
55 extern char *identname;
56 extern char *pidfilename;
58 extern int use_logfile;
62 static int saved_debug_level = -1;
68 static void memory_full(int size)
70 logger(DEBUG_ALWAYS, LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
75 /* Some functions the less gifted operating systems might lack... */
77 #ifndef HAVE_FCLOSEALL
78 static int fcloseall(void)
91 Close network connections, and terminate neatly
93 void cleanup_and_exit(int c)
97 close_network_connections();
99 if(debug_level > DEBUG_NOTHING)
102 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Terminating"));
109 check for an existing tinc for this net, and write pid to pidfile
111 static int write_pidfile(void)
117 pid = check_pid(pidfilename);
121 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
124 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
128 /* if it's locked, write-protected, or whatever */
129 if(!write_pid(pidfilename))
136 kill older tincd for this net
138 int kill_other(int signal)
144 pid = read_pid(pidfilename);
148 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
151 fprintf(stderr, _("No other tincd is running.\n"));
155 errno = 0; /* No error, sometimes errno is only changed on error */
157 /* ESRCH is returned when no process with that pid is found */
158 if(kill(pid, signal) && errno == ESRCH) {
160 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
163 fprintf(stderr, _("The tincd is no longer running. "));
165 fprintf(stderr, _("Removing stale lock file.\n"));
166 remove_pid(pidfilename);
173 Detach from current terminal, write pidfile, kill parent
181 /* First check if we can open a fresh new pidfile */
186 /* If we succeeded in doing that, detach */
191 if(daemon(0, 0) < 0) {
192 fprintf(stderr, _("Couldn't detach from terminal: %s"),
197 /* Now UPDATE the pid in the pidfile, because we changed it... */
199 if(!write_pid(pidfilename))
203 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
205 logger(DEBUG_ALWAYS, LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
206 VERSION, __DATE__, __TIME__, debug_level);
208 xalloc_fail_func = memory_full;
214 Execute the program name, with sane environment.
216 static void _execute_script(const char *scriptname, char **envp)
217 __attribute__ ((noreturn));
218 static void _execute_script(const char *scriptname, char **envp)
229 /* Close all file descriptors */
232 execl(scriptname, NULL);
233 /* No return on success */
235 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
236 logger(DEBUG_ALWAYS, LOG_ERR, _("Could not execute `%s': %s"), scriptname,
242 Fork and execute the program pointed to by name.
244 int execute_script(const char *name, char **envp)
253 asprintf(&scriptname, "%s/%s", confbase, name);
255 /* First check if there is a script */
257 if(stat(scriptname, &s))
263 logger(DEBUG_ALWAYS, LOG_ERR, _("System call `%s' failed: %s"), "fork",
269 logger(DEBUG_STATUS, LOG_INFO, _("Executing script %s"), name);
273 if(waitpid(pid, &status, 0) == pid) {
274 if(WIFEXITED(status)) { /* Child exited by itself */
275 if(WEXITSTATUS(status)) {
276 logger(DEBUG_ALWAYS, LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
277 pid, name, WEXITSTATUS(status));
281 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
282 logger(DEBUG_ALWAYS, LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
283 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
285 } else { /* Something strange happened */
286 logger(DEBUG_ALWAYS, LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
290 } else if (errno != EINTR) {
291 logger(DEBUG_ALWAYS, LOG_ERR, _("System call `%s' failed: %s"), "waitpid",
296 /* Why do we get EINTR? */
302 _execute_script(scriptname, envp);
310 static RETSIGTYPE sigterm_handler(int a)
312 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Got TERM signal"));
317 static RETSIGTYPE sigquit_handler(int a)
319 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Got QUIT signal"));
323 static RETSIGTYPE fatal_signal_square(int a)
325 logger(DEBUG_ALWAYS, LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
331 static RETSIGTYPE fatal_signal_handler(int a)
333 struct sigaction act;
334 logger(DEBUG_ALWAYS, LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
338 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
340 act.sa_handler = fatal_signal_square;
341 act.sa_mask = emptysigset;
343 sigaction(SIGSEGV, &act, NULL);
345 close_network_connections();
347 remove_pid(pidfilename);
348 execvp(g_argv[0], g_argv);
350 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Not restarting."));
355 static RETSIGTYPE sighup_handler(int a)
357 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Got HUP signal"));
361 static RETSIGTYPE sigint_handler(int a)
363 if(saved_debug_level != -1) {
364 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Reverting to old debug level (%d)"),
366 debug_level = saved_debug_level;
367 saved_debug_level = -1;
369 logger(DEBUG_ALWAYS, LOG_NOTICE,
370 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
372 saved_debug_level = debug_level;
377 static RETSIGTYPE sigalrm_handler(int a)
379 logger(DEBUG_ALWAYS, LOG_NOTICE, _("Got ALRM signal"));
383 static RETSIGTYPE sigusr1_handler(int a)
388 static RETSIGTYPE sigusr2_handler(int a)
396 static RETSIGTYPE sigwinch_handler(int a)
402 static RETSIGTYPE unexpected_signal_handler(int a)
404 logger(DEBUG_ALWAYS, LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
408 static RETSIGTYPE ignore_signal_handler(int a)
410 logger(DEBUG_SCARY_THINGS, LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
415 void (*handler)(int);
418 SIGHUP, sighup_handler}, {
419 SIGTERM, sigterm_handler}, {
420 SIGQUIT, sigquit_handler}, {
421 SIGSEGV, fatal_signal_handler}, {
422 SIGBUS, fatal_signal_handler}, {
423 SIGILL, fatal_signal_handler}, {
424 SIGPIPE, ignore_signal_handler}, {
425 SIGINT, sigint_handler}, {
426 SIGUSR1, sigusr1_handler}, {
427 SIGUSR2, sigusr2_handler}, {
428 SIGCHLD, ignore_signal_handler}, {
429 SIGALRM, sigalrm_handler}, {
430 SIGWINCH, sigwinch_handler}, {
434 void setup_signals(void)
437 struct sigaction act;
439 sigemptyset(&emptysigset);
440 act.sa_handler = NULL;
441 act.sa_mask = emptysigset;
444 /* Set a default signal handler for every signal, errors will be
446 for(i = 0; i < NSIG; i++) {
448 act.sa_handler = SIG_DFL;
450 act.sa_handler = unexpected_signal_handler;
451 sigaction(i, &act, NULL);
454 /* If we didn't detach, allow coredumps */
456 sighandlers[3].handler = SIG_DFL;
458 /* Then, for each known signal that we want to catch, assign a
459 handler to the signal, with error checking this time. */
460 for(i = 0; sighandlers[i].signal; i++) {
461 act.sa_handler = sighandlers[i].handler;
462 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
463 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
464 sighandlers[i].signal, strsignal(sighandlers[i].signal),