ircd/ircd_signal.c

   1 /************************************************************************
   2  *   IRC - Internet Relay Chat, src/ircd_signal.c
   3  *   Copyright (C) 1990 Jarkko Oikarinen and
   4  *                      University of Oulu, Computing Center
   5  *
   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)
   9  *   any later version.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 #include "stdinc.h"
  22 #include "ircd_signal.h"
  23 #include "ircd.h"               /* dorehash */
  24 #include "restart.h"            /* server_reboot */
  25 #include "logger.h"
  26 #include "s_conf.h"
  27 #include "client.h"
  28 #include "send.h"
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31
  32 /*
  33  * dummy_handler - don't know if this is really needed but if alarm is still
  34  * being used we probably will
  35  */
  36 static void
  37 dummy_handler(int sig)
  38 {
  39         /* Empty */
  40 }
  41
  42
  43 static void
  44 sigchld_handler(int sig)
  45 {
  46         int status, olderrno;
  47
  48         olderrno = errno;
  49         while (waitpid(-1, &status, WNOHANG) > 0)
  50                 ;
  51         errno = olderrno;
  52 }
  53
  54 /*
  55  * sigterm_handler - exit the server
  56  */
  57 static void
  58 sigterm_handler(int sig) __attribute__((noreturn));
  59
  60 static void
  61 sigterm_handler(int sig)
  62 {
  63         ircd_shutdown("Received SIGTERM");
  64 }
  65
  66 /*
  67  * sighup_handler - reread the server configuration
  68  */
  69 static void
  70 sighup_handler(int sig)
  71 {
  72         dorehash = true;
  73 }
  74
  75 /*
  76  * sigusr1_handler - reread the motd file
  77  */
  78 static void
  79 sigusr1_handler(int sig)
  80 {
  81         doremotd = true;
  82 }
  83
  84 static void
  85 sigusr2_handler(int sig)
  86 {
  87         dorehashbans = true;
  88 }
  89
  90 /*
  91  * sigint_handler - restart the server
  92  */
  93 static void
  94 sigint_handler(int sig)
  95 {
  96         static bool restarting = false;
  97
  98         if(server_state_foreground)
  99         {
 100                 ilog(L_MAIN, "Server exiting on SIGINT");
 101                 exit(0);
 102         }
 103         else
 104         {
 105                 ilog(L_MAIN, "Server Restarting on SIGINT");
 106                 if(!restarting)
 107                 {
 108                         restarting = true;
 109                         server_reboot();
 110                 }
 111         }
 112 }
 113
 114 /*
 115  * setup_signals - initialize signal handlers for server
 116  */
 117 void
 118 setup_signals()
 119 {
 120         sigset_t sigs;
 121         struct sigaction act;
 122
 123         sigemptyset(&sigs);
 124         act.sa_flags = 0;
 125         act.sa_handler = SIG_IGN;
 126         sigemptyset(&act.sa_mask);
 127         sigaddset(&act.sa_mask, SIGPIPE);
 128         sigaddset(&act.sa_mask, SIGALRM);
 129 #ifdef SIGTRAP
 130         sigaddset(&act.sa_mask, SIGTRAP);
 131 #endif
 132
 133 # ifdef SIGWINCH
 134         sigaddset(&act.sa_mask, SIGWINCH);
 135         sigaction(SIGWINCH, &act, 0);
 136 # endif
 137         sigaction(SIGPIPE, &act, 0);
 138 #ifdef SIGTRAP
 139         sigaction(SIGTRAP, &act, 0);
 140 #endif
 141
 142         act.sa_handler = dummy_handler;
 143         sigaction(SIGALRM, &act, 0);
 144         sigaddset(&sigs, SIGALRM);
 145
 146         act.sa_handler = sighup_handler;
 147         sigemptyset(&act.sa_mask);
 148         sigaddset(&act.sa_mask, SIGHUP);
 149         sigaction(SIGHUP, &act, 0);
 150         sigaddset(&sigs, SIGHUP);
 151
 152         act.sa_handler = sigint_handler;
 153         sigaddset(&act.sa_mask, SIGINT);
 154         sigaction(SIGINT, &act, 0);
 155         sigaddset(&sigs, SIGINT);
 156
 157         act.sa_handler = sigterm_handler;
 158         sigaddset(&act.sa_mask, SIGTERM);
 159         sigaction(SIGTERM, &act, 0);
 160         sigaddset(&sigs, SIGTERM);
 161
 162         act.sa_handler = sigusr1_handler;
 163         sigaddset(&act.sa_mask, SIGUSR1);
 164         sigaction(SIGUSR1, &act, 0);
 165         sigaddset(&sigs, SIGUSR1);
 166
 167         act.sa_handler = sigusr2_handler;
 168         sigaddset(&act.sa_mask, SIGUSR2);
 169         sigaction(SIGUSR2, &act, 0);
 170         sigaddset(&sigs, SIGUSR2);
 171
 172         act.sa_handler = sigchld_handler;
 173         sigaddset(&act.sa_mask, SIGCHLD);
 174         sigaction(SIGCHLD, &act, 0);
 175         sigaddset(&sigs, SIGCHLD);
 176
 177         sigprocmask(SIG_UNBLOCK, &sigs, NULL);
 178 }