2 * IRC - Internet Relay Chat, ircd/ircd_signal.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
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 1, or (at your option)
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.
21 * @brief Signal handlers for ircu.
27 #include "ircd_events.h"
29 #include "ircd_signal.h"
32 /* #include <assert.h> -- Now using assert in ircd_log.h */
35 /** Counts various types of signals that we receive. */
36 static struct tag_SignalCounter {
37 unsigned int alrm; /**< Received SIGALRM count. */
38 unsigned int hup; /**< Received SIGHUP count. */
41 /** Event generator for SIGHUP. */
42 static struct Signal sig_hup;
43 /** Event generator for SIGINT. */
44 static struct Signal sig_int;
45 /** Event generator for SIGTERM. */
46 static struct Signal sig_term;
48 /** Signal handler for SIGALRM.
49 * @param[in] sig Signal number (ignored).
51 static void sigalrm_handler(int sig)
56 /** Signal callback for SIGTERM.
57 * @param[in] ev Signal event descriptor.
59 static void sigterm_callback(struct Event* ev)
61 assert(0 != ev_signal(ev));
62 assert(ET_SIGNAL == ev_type(ev));
63 assert(SIGTERM == sig_signal(ev_signal(ev)));
64 assert(SIGTERM == ev_data(ev));
66 server_die("received signal SIGTERM");
69 /** Signal callback for SIGHUP.
70 * @param[in] ev Signal event descriptor.
72 static void sighup_callback(struct Event* ev)
74 assert(0 != ev_signal(ev));
75 assert(ET_SIGNAL == ev_type(ev));
76 assert(SIGHUP == sig_signal(ev_signal(ev)));
77 assert(SIGHUP == ev_data(ev));
83 /** Signal callback for SIGINT.
84 * @param[in] ev Signal event descriptor.
86 static void sigint_callback(struct Event* ev)
88 assert(0 != ev_signal(ev));
89 assert(ET_SIGNAL == ev_type(ev));
90 assert(SIGINT == sig_signal(ev_signal(ev)));
91 assert(SIGINT == ev_data(ev));
93 server_restart("caught signal: SIGINT");
96 /** Register all necessary signal handlers. */
97 void setup_signals(void)
101 act.sa_handler = SIG_IGN;
103 sigemptyset(&act.sa_mask);
104 sigaddset(&act.sa_mask, SIGPIPE);
105 sigaddset(&act.sa_mask, SIGALRM);
107 sigaddset(&act.sa_mask, SIGWINCH);
108 sigaction(SIGWINCH, &act, 0);
110 sigaction(SIGPIPE, &act, 0);
112 act.sa_handler = sigalrm_handler;
113 sigaction(SIGALRM, &act, 0);
115 signal_add(&sig_hup, sighup_callback, 0, SIGHUP);
116 signal_add(&sig_int, sigint_callback, 0, SIGINT);
117 signal_add(&sig_term, sigterm_callback, 0, SIGTERM);
119 #ifdef HAVE_RESTARTABLE_SYSCALLS
121 * At least on Apollo sr10.1 it seems continuing system calls
122 * after signal is the default. The following 'siginterrupt'
123 * should change that default to interrupting calls.
125 siginterrupt(SIGALRM, 1);