f890420014
After setting up signal handlers, unmask the signals we care about (installed handlers for). When handling SIGINT, the kernel adds SIGHUP and SIGINT to the signal mask (as requested in sigaction()); if execve() is called from the signal handler, this change is persistent.
175 lines
3.6 KiB
C
175 lines
3.6 KiB
C
/************************************************************************
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* IRC - Internet Relay Chat, src/ircd_signal.c
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* Copyright (C) 1990 Jarkko Oikarinen and
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* University of Oulu, Computing Center
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: ircd_signal.c 6 2005-09-10 01:02:21Z nenolod $
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*/
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#include "stdinc.h"
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#include "ircd_signal.h"
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#include "ircd.h" /* dorehash */
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#include "restart.h" /* server_reboot */
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#include "logger.h"
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#include "s_conf.h"
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#include "client.h"
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#include "send.h"
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/*
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* dummy_handler - don't know if this is really needed but if alarm is still
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* being used we probably will
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*/
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static void
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dummy_handler(int sig)
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{
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/* Empty */
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}
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static void
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sigchld_handler(int sig)
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{
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int status, olderrno;
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olderrno = errno;
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while (waitpid(-1, &status, WNOHANG) > 0)
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;
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errno = olderrno;
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}
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/*
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* sigterm_handler - exit the server
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*/
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static void
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sigterm_handler(int sig)
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{
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ircd_shutdown("Received SIGTERM");
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}
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/*
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* sighup_handler - reread the server configuration
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*/
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static void
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sighup_handler(int sig)
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{
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dorehash = 1;
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}
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/*
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* sigusr1_handler - reread the motd file
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*/
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static void
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sigusr1_handler(int sig)
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{
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doremotd = 1;
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}
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static void
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sigusr2_handler(int sig)
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{
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dorehashbans = 1;
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}
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/*
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* sigint_handler - restart the server
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*/
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static void
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sigint_handler(int sig)
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{
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static int restarting = 0;
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if(server_state_foreground)
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{
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ilog(L_MAIN, "Server exiting on SIGINT");
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exit(0);
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}
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else
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{
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ilog(L_MAIN, "Server Restarting on SIGINT");
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if(restarting == 0)
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{
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restarting = 1;
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server_reboot();
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}
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}
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}
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/*
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* setup_signals - initialize signal handlers for server
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*/
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void
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setup_signals()
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{
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sigset_t sigs;
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struct sigaction act;
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sigemptyset(&sigs);
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act.sa_flags = 0;
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act.sa_handler = SIG_IGN;
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask, SIGPIPE);
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sigaddset(&act.sa_mask, SIGALRM);
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#ifdef SIGTRAP
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sigaddset(&act.sa_mask, SIGTRAP);
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#endif
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# ifdef SIGWINCH
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sigaddset(&act.sa_mask, SIGWINCH);
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sigaction(SIGWINCH, &act, 0);
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# endif
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sigaction(SIGPIPE, &act, 0);
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#ifdef SIGTRAP
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sigaction(SIGTRAP, &act, 0);
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#endif
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act.sa_handler = dummy_handler;
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sigaction(SIGALRM, &act, 0);
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sigaddset(&sigs, SIGALRM);
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act.sa_handler = sighup_handler;
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask, SIGHUP);
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sigaction(SIGHUP, &act, 0);
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sigaddset(&sigs, SIGHUP);
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act.sa_handler = sigint_handler;
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sigaddset(&act.sa_mask, SIGINT);
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sigaction(SIGINT, &act, 0);
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sigaddset(&sigs, SIGINT);
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act.sa_handler = sigterm_handler;
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sigaddset(&act.sa_mask, SIGTERM);
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sigaction(SIGTERM, &act, 0);
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sigaddset(&sigs, SIGTERM);
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act.sa_handler = sigusr1_handler;
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sigaddset(&act.sa_mask, SIGUSR1);
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sigaction(SIGUSR1, &act, 0);
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sigaddset(&sigs, SIGUSR1);
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act.sa_handler = sigusr2_handler;
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sigaddset(&act.sa_mask, SIGUSR2);
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sigaction(SIGUSR2, &act, 0);
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sigaddset(&sigs, SIGUSR2);
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act.sa_handler = sigchld_handler;
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sigaddset(&act.sa_mask, SIGCHLD);
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sigaction(SIGCHLD, &act, 0);
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sigaddset(&sigs, SIGCHLD);
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sigprocmask(SIG_UNBLOCK, &sigs, NULL);
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}
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