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 1.1.2.13 2000/11/24 12:44:39 zarq Exp $
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
46 #include "connection.h"
50 /* A list containing all our children */
51 list_t *child_pids = NULL;
53 /* If zero, don't detach from the terminal. */
58 extern char *identname;
59 extern char *pidfilename;
62 void init_processes(void)
65 child_pids = list_new();
69 void memory_full(int size)
71 syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size);
76 /* Some functions the less gifted operating systems might lack... */
78 #ifndef HAVE_FCLOSEALL
90 int become_daemon(void)
97 if((pid = fork()) < 0)
102 if(pid) /* parent process */
104 signal(SIGTERM, parent_exit);
105 sleep(600); /* wait 10 minutes */
109 if((fd = open("/dev/tty", O_RDWR)) >= 0)
111 if(ioctl(fd, TIOCNOTTY, NULL))
129 Close network connections, and terminate neatly
131 void cleanup_and_exit(int c)
134 close_network_connections();
136 if(debug_lvl > DEBUG_NOTHING)
137 syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"),
138 total_tap_out, total_socket_out, total_tap_in, total_socket_in);
146 check for an existing tinc for this net, and write pid to pidfile
148 int write_pidfile(void)
152 if((pid = check_pid(pidfilename)))
155 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
158 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
162 /* if it's locked, write-protected, or whatever */
163 if(!write_pid(pidfilename))
170 kill older tincd for this net
176 if(!(pid = read_pid(pidfilename)))
179 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
181 fprintf(stderr, _("No other tincd is running.\n"));
185 errno = 0; /* No error, sometimes errno is only changed on error */
186 /* ESRCH is returned when no process with that pid is found */
187 if(kill(pid, SIGTERM) && errno == ESRCH)
188 fprintf(stderr, _("Removing stale lock file.\n"));
189 remove_pid(pidfilename);
195 Detach from current terminal, write pidfile, kill parent
203 if(become_daemon() < 0)
209 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
211 if(debug_lvl > DEBUG_NOTHING)
212 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
213 VERSION, __DATE__, __TIME__, debug_lvl);
215 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
217 xalloc_fail_func = memory_full;
223 Execute the program name, with sane environment. All output will be
224 redirected to syslog.
226 void _execute_script(const char *name) __attribute__ ((noreturn));
227 void _execute_script(const char *name)
237 asprintf(&s, "NETNAME=%s", netname);
238 putenv(s); /* Don't free s! see man 3 putenv */
247 if(chdir(confbase) < 0)
248 /* This cannot fail since we already read config files from this
250 /* Yes this can fail, somebody could have removed this directory
251 when we didn't pay attention. - Ivo */
254 /* Now if THIS fails, something wicked is going on. - Ivo */
255 syslog(LOG_ERR, _("Couldn't chdir to `/': %m"));
257 /* Continue anyway. */
260 asprintf(&scriptname, "%s/%s", confbase, name);
262 /* Close all file descriptors */
266 /* Open standard input */
267 if((fd = open("/dev/null", O_RDONLY)) < 0)
269 syslog(LOG_ERR, _("Opening `/dev/null' failed: %m"));
274 syslog(LOG_ERR, _("Couldn't assign /dev/null to standard input: %m"));
280 close(1); /* fd #1 should be the first available filedescriptor now. */
281 /* Standard output directly goes to syslog */
282 openlog(name, LOG_CONS | LOG_PID, LOG_DAEMON);
283 /* Standard error as well */
286 syslog(LOG_ERR, _("System call `%s' failed: %m"),
292 if(error && debug_lvl > 1)
293 syslog(LOG_INFO, _("This means that any output the script generates will not be shown in syslog."));
295 execl(scriptname, NULL);
296 /* No return on success */
298 if(errno != ENOENT) /* Ignore if the file does not exist */
299 syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname);
301 /* No need to free things */
306 Fork and execute the program pointed to by name.
308 int execute_script(const char *name)
312 if((pid = fork()) < 0)
314 syslog(LOG_ERR, _("System call `%s' failed: %m"),
321 list_append(child_pids, &pid);
326 _execute_script(name);
330 Check a child (the pointer data is actually an integer, the PID of
331 that child. A non-zero return value means that the child has exited
332 and can be removed from our list.
334 int check_child(void *data)
340 pid = waitpid(pid, &status, WNOHANG);
341 if(WIFEXITED(status))
343 if(WIFSIGNALED(status)) /* Child was killed by a signal */
345 syslog(LOG_ERR, _("Child with PID %d was killed by signal %d (%s)"),
346 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
349 if(WEXITSTATUS(status) != 0)
351 syslog(LOG_INFO, _("Child with PID %d exited with code %d"),
352 WEXITSTATUS(status));
357 /* Child is still running */
362 Check the status of all our children.
364 void check_children(void)
366 list_forall_nodes(child_pids, check_child);
375 sigterm_handler(int a)
377 if(debug_lvl > DEBUG_NOTHING)
378 syslog(LOG_NOTICE, _("Got TERM signal"));
384 sigquit_handler(int a)
386 if(debug_lvl > DEBUG_NOTHING)
387 syslog(LOG_NOTICE, _("Got QUIT signal"));
392 sigsegv_square(int a)
394 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
399 sigsegv_handler(int a)
401 syslog(LOG_ERR, _("Got SEGV signal"));
406 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
407 signal(SIGSEGV, sigsegv_square);
408 close_network_connections();
410 remove_pid(pidfilename);
411 execvp(g_argv[0], g_argv);
415 syslog(LOG_NOTICE, _("Not restarting."));
421 sighup_handler(int a)
423 if(debug_lvl > DEBUG_NOTHING)
424 syslog(LOG_NOTICE, _("Got HUP signal"));
429 sigint_handler(int a)
431 if(debug_lvl > DEBUG_NOTHING)
432 syslog(LOG_NOTICE, _("Got INT signal, exiting"));
437 sigusr1_handler(int a)
439 dump_connection_list();
443 sigusr2_handler(int a)
451 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
463 if(signal(SIGTERM, SIG_IGN) != SIG_ERR)
464 signal(SIGTERM, sigterm_handler);
465 if(signal(SIGQUIT, SIG_IGN) != SIG_ERR)
466 signal(SIGQUIT, sigquit_handler);
467 if(signal(SIGSEGV, SIG_IGN) != SIG_ERR)
468 signal(SIGSEGV, sigsegv_handler);
469 if(signal(SIGHUP, SIG_IGN) != SIG_ERR)
470 signal(SIGHUP, sighup_handler);
471 signal(SIGPIPE, SIG_IGN);
472 if(signal(SIGINT, SIG_IGN) != SIG_ERR)
473 signal(SIGINT, sigint_handler);
474 signal(SIGUSR1, sigusr1_handler);
475 signal(SIGUSR2, sigusr2_handler);
476 signal(SIGCHLD, SIG_IGN);
479 RETSIGTYPE parent_exit(int a)