src/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  * $Id: ircd_signal.c 6 2005-09-10 01:02:21Z nenolod $
  21  */
  22
  23 #include "stdinc.h"
  24 #include "ircd_signal.h"
  25 #include "ircd.h"               /* dorehash */
  26 #include "restart.h"            /* server_reboot */
  27 #include "logger.h"
  28 #include "s_conf.h"
  29 #include "client.h"
  30 #include "send.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)
  59 {
  60         ircd_shutdown("Received SIGTERM");
  61 }
  62
  63 /*
  64  * sighup_handler - reread the server configuration
  65  */
  66 static void
  67 sighup_handler(int sig)
  68 {
  69         dorehash = 1;
  70 }
  71
  72 /*
  73  * sigusr1_handler - reread the motd file
  74  */
  75 static void
  76 sigusr1_handler(int sig)
  77 {
  78         doremotd = 1;
  79 }
  80
  81 static void
  82 sigusr2_handler(int sig)
  83 {
  84         dorehashbans = 1;
  85 }
  86
  87 /*
  88  * sigint_handler - restart the server
  89  */
  90 static void
  91 sigint_handler(int sig)
  92 {
  93         static int restarting = 0;
  94
  95         if(server_state_foreground)
  96         {
  97                 ilog(L_MAIN, "Server exiting on SIGINT");
  98                 exit(0);
  99         }
 100         else
 101         {
 102                 ilog(L_MAIN, "Server Restarting on SIGINT");
 103                 if(restarting == 0)
 104                 {
 105                         restarting = 1;
 106                         server_reboot();
 107                 }
 108         }
 109 }
 110
 111 /*
 112  * setup_signals - initialize signal handlers for server
 113  */
 114 void
 115 setup_signals()
 116 {
 117         struct sigaction act;
 118
 119         act.sa_flags = 0;
 120         act.sa_handler = SIG_IGN;
 121         sigemptyset(&act.sa_mask);
 122         sigaddset(&act.sa_mask, SIGPIPE);
 123         sigaddset(&act.sa_mask, SIGALRM);
 124 #ifdef SIGTRAP
 125         sigaddset(&act.sa_mask, SIGTRAP);
 126 #endif
 127
 128 # ifdef SIGWINCH
 129         sigaddset(&act.sa_mask, SIGWINCH);
 130         sigaction(SIGWINCH, &act, 0);
 131 # endif
 132         sigaction(SIGPIPE, &act, 0);
 133 #ifdef SIGTRAP
 134         sigaction(SIGTRAP, &act, 0);
 135 #endif
 136
 137         act.sa_handler = dummy_handler;
 138         sigaction(SIGALRM, &act, 0);
 139
 140         act.sa_handler = sighup_handler;
 141         sigemptyset(&act.sa_mask);
 142         sigaddset(&act.sa_mask, SIGHUP);
 143         sigaction(SIGHUP, &act, 0);
 144
 145         act.sa_handler = sigint_handler;
 146         sigaddset(&act.sa_mask, SIGINT);
 147         sigaction(SIGINT, &act, 0);
 148
 149         act.sa_handler = sigterm_handler;
 150         sigaddset(&act.sa_mask, SIGTERM);
 151         sigaction(SIGTERM, &act, 0);
 152
 153         act.sa_handler = sigusr1_handler;
 154         sigaddset(&act.sa_mask, SIGUSR1);
 155         sigaction(SIGUSR1, &act, 0);
 156
 157         act.sa_handler = sigusr2_handler;
 158         sigaddset(&act.sa_mask, SIGUSR2);
 159         sigaction(SIGUSR2, &act, 0);
 160
 161         act.sa_handler = sigchld_handler;
 162         sigaddset(&act.sa_mask, SIGCHLD);
 163         sigaction(SIGCHLD, &act, 0);
 164
 165 }