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/* |
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* signal.C: Signal-handling routines. |
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* Rights to this code are documented in doc/LICENSE. |
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* |
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* Copyright © 2005-2007 Atheme Project (http://www.atheme.org) |
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*/ |
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|
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static char const rcsid[] = "$Id"; |
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|
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#include "atheme.h" |
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#include "uplink.h" |
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#include "internal.h" |
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|
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typedef void (*signal_handler_t) (int); |
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|
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static signal_handler_t |
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signal_install_handler_full (int signum, signal_handler_t handler, int *sigtoblock, size_t sigtoblocksize) |
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{ |
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struct sigaction action, old_action; |
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size_t i; |
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|
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action.sa_handler = handler; |
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action.sa_flags = SA_RESTART; |
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|
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sigemptyset (&action.sa_mask); |
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|
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for (i = 0; i < sigtoblocksize; i++) |
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sigaddset (&action.sa_mask, sigtoblock[i]); |
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|
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if (sigaction (signum, &action, &old_action) == -1) |
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{ |
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slog (LG_DEBUG, "Failed to install signal handler for signal %d", signum); |
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return NULL; |
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} |
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|
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return old_action.sa_handler; |
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} |
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|
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/* |
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* A version of signal(2) that works more reliably across different |
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* platforms. |
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* |
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* It restarts interrupted system calls, does not reset the handler, |
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* and blocks the same signal from within the handler. |
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*/ |
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static signal_handler_t |
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signal_install_handler (int signum, signal_handler_t handler) |
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{ |
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return signal_install_handler_full (signum, handler, NULL, 0); |
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} |
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|
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static void |
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signal_empty_handler (int signum) |
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{ |
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/* do nothing */ |
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} |
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|
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static void |
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signal_hup_handler (int signum) |
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{ |
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/* rehash */ |
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slog (LG_INFO, "sighandler(): got SIGHUP, rehashing %s", config_file); |
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|
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wallops (_("Got SIGHUP; reloading \2%s\2."), config_file); |
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|
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snoop ("UPDATE: \2%s\2", "system console"); |
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wallops (_("Updating database by request of \2%s\2."), "system console"); |
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expire_check (NULL); |
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db_save (NULL); |
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|
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snoop ("REHASH: \2%s\2", "system console"); |
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wallops (_("Rehashing \2%s\2 by request of \2%s\2."), config_file, "system console"); |
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|
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/* reload the config, opening other logs besides the core log if needed. */ |
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if (!conf_rehash ()) |
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wallops (_("REHASH of \2%s\2 failed. Please correct any errors in the file and try again."), config_file); |
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|
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return; |
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} |
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|
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static void |
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signal_int_handler (int signum) |
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{ |
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/* usually caused by ^C */ |
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if (runflags & RF_LIVE) |
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{ |
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wallops (_("Exiting on signal %d."), SIGINT); |
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if (chansvs.me != NULL && chansvs.me->me != NULL) |
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quit_sts (chansvs.me->me, "caught interrupt"); |
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me.connected = false; |
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slog (LG_INFO, "sighandler(): caught interrupt; exiting..."); |
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runflags |= RF_SHUTDOWN; |
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} |
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else if (!(runflags & RF_LIVE)) |
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{ |
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wallops (_("Got SIGINT; restarting.")); |
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|
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snoop ("UPDATE: \2%s\2", "system console"); |
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wallops (_("Updating database by request of \2%s\2."), "system console"); |
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expire_check (NULL); |
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db_save (NULL); |
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|
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snoop ("RESTART: \2%s\2", "system console"); |
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wallops (_("Restarting by request of \2%s\2."), "system console"); |
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|
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slog (LG_INFO, "sighandler(): restarting..."); |
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runflags |= RF_RESTART; |
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} |
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} |
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|
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static void |
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signal_term_handler (int signum) |
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{ |
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wallops (_("Exiting on signal %d."), SIGTERM); |
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slog (LG_INFO, "sighandler(): got SIGTERM; exiting..."); |
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runflags |= RF_SHUTDOWN; |
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} |
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|
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static void |
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signal_usr2_handler (int signum) |
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{ |
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wallops (_("Got SIGUSR2; restarting.")); |
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|
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snoop ("UPDATE: \2%s\2", "system console"); |
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wallops (_("Updating database by request of \2%s\2."), "system console"); |
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expire_check (NULL); |
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db_save (NULL); |
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|
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snoop ("RESTART: \2%s\2", "system console"); |
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wallops (_("Restarting by request of \2%s\2."), "system console"); |
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|
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slog (LG_INFO, "sighandler(): restarting..."); |
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runflags |= RF_RESTART; |
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} |
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|
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/* XXX */ |
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static void |
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signal_usr1_handler (int signum) |
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{ |
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if (me.connected && curr_uplink != NULL && curr_uplink->conn != NULL) |
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{ |
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if (chansvs.nick != NULL) |
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{ |
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write (curr_uplink->conn->fd, ":", 1); |
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write (curr_uplink->conn->fd, chansvs.nick, strlen (chansvs.nick)); |
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write (curr_uplink->conn->fd, " QUIT :Out of memory!\r\n", 23); |
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} |
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write (curr_uplink->conn->fd, "ERROR :Panic! Out of memory.\r\n", 30); |
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} |
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if (runflags & (RF_LIVE | RF_STARTING)) |
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write (2, "Out of memory!\n", 15); |
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abort (); |
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} |
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|
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void |
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init_signal_handlers (void) |
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{ |
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signal_install_handler (SIGHUP, signal_hup_handler); |
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signal_install_handler (SIGINT, signal_int_handler); |
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signal_install_handler (SIGTERM, signal_term_handler); |
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signal_install_handler (SIGPIPE, signal_empty_handler); |
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|
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signal_install_handler (SIGUSR1, signal_usr1_handler); |
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signal_install_handler (SIGUSR2, signal_usr2_handler); |
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} |
