trunk/src/ircd_signal.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  ircd_signal.c: responsible for ircd's signal handling
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "ircd_signal.h"
#include "ircd.h"         /* dorehash */
#include "restart.h"      /* server_die */
#include "memory.h"
#include "s_bsd.h"

/*
 * sigterm_handler - exit the server
 */
static void 
sigterm_handler(int sig)  
{
  server_die("received signal SIGTERM", 0);
}

/* 
 * sighup_handler - reread the server configuration
 */
static void 
sighup_handler(int sig)
{
  dorehash = 1;
}

/*
 * sigusr1_handler - reread the motd file
 */
static void
sigusr1_handler(int sig)
{
  doremotd = 1;
}

/*
 * 
 * inputs       - nothing
 * output       - nothing
 * side effects - Reaps zombies periodically
 * -AndroSyn
 */
static void
sigchld_handler(int sig)
{
  int status, errno_save = errno;

  while (waitpid(-1, &status, WNOHANG) > 0)
    ;
  errno = errno_save;
}

/*
 * sigint_handler - restart the server
 */
static void 
sigint_handler(int sig)
{
  server_die("SIGINT received", !server_state.foreground);
}

/*
 * setup_signals - initialize signal handlers for server
 */
void 
setup_signals(void)
{
  struct sigaction act;

  act.sa_flags = 0;
  act.sa_handler = SIG_IGN;

  sigemptyset(&act.sa_mask);
#ifdef SIGXFSZ
  sigaddset(&act.sa_mask, SIGXFSZ);
#endif
#ifdef SIGWINCH
  sigaddset(&act.sa_mask, SIGWINCH);
#endif
#ifdef SIGTRAP
  sigaddset(&act.sa_mask, SIGTRAP);
#endif
  sigaddset(&act.sa_mask, SIGPIPE);
  sigaddset(&act.sa_mask, SIGALRM);
  sigaddset(&act.sa_mask, SIGHUP);
  sigaddset(&act.sa_mask, SIGINT);
  sigaddset(&act.sa_mask, SIGTERM);
  sigaddset(&act.sa_mask, SIGUSR1);
  sigaddset(&act.sa_mask, SIGCHLD);

#ifdef SIGXFSZ
  sigaction(SIGXFSZ, &act, 0);
#endif
#ifdef SIGWINCH
  sigaction(SIGWINCH, &act, 0);
#endif
#ifdef SIGTRAP
  sigaction(SIGTRAP, &act, 0);
#endif
  sigaction(SIGPIPE, &act, 0);
  sigaction(SIGALRM, &act, 0);

  act.sa_handler = sighup_handler;
  sigaction(SIGHUP, &act, 0);

  act.sa_handler = sigint_handler;
  sigaction(SIGINT, &act, 0);

  act.sa_handler = sigterm_handler;
  sigaction(SIGTERM, &act, 0);

  act.sa_handler = sigusr1_handler;
  sigaction(SIGUSR1, &act, 0);

  act.sa_handler = sigchld_handler;
  sigaction(SIGCHLD, &act, 0);

  sigprocmask(SIG_UNBLOCK, &act.sa_mask, NULL);
}
Revision:	2834
Committed:	Thu Jan 16 17:54:09 2014 UTC (11 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	3128 byte(s)
Log Message:	- ircd_signal.c:setup_signals(): fixed bug where signals stopped from working after restaring the ircd via SIGINT. Spotted and fixed by Adam.
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* ircd_signal.c: responsible for ircd's signal handling
4			*
5			* Copyright (C) 2002 by the past and present ircd coders, and others.
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20			* USA
21			*
22	knight	31	* $Id$
23	adx	30	*/
24
25			#include "stdinc.h"
26	michael	1011	#include "list.h"
27	adx	30	#include "ircd_signal.h"
28			#include "ircd.h" /* dorehash */
29	michael	594	#include "restart.h" /* server_die */
30	adx	30	#include "memory.h"
31			#include "s_bsd.h"
32
33			/*
34			* sigterm_handler - exit the server
35			*/
36			static void
37			sigterm_handler(int sig)
38			{
39	michael	1011	server_die("received signal SIGTERM", 0);
40	adx	30	}
41
42			/*
43			* sighup_handler - reread the server configuration
44			*/
45			static void
46			sighup_handler(int sig)
47			{
48			dorehash = 1;
49			}
50
51			/*
52			* sigusr1_handler - reread the motd file
53			*/
54			static void
55			sigusr1_handler(int sig)
56			{
57			doremotd = 1;
58			}
59
60			/*
61			*
62			* inputs - nothing
63			* output - nothing
64			* side effects - Reaps zombies periodically
65			* -AndroSyn
66			*/
67			static void
68			sigchld_handler(int sig)
69			{
70	michael	2832	int status, errno_save = errno;
71
72			while (waitpid(-1, &status, WNOHANG) > 0)
73			;
74			errno = errno_save;
75	adx	30	}
76
77			/*
78			* sigint_handler - restart the server
79			*/
80			static void
81			sigint_handler(int sig)
82			{
83	michael	594	server_die("SIGINT received", !server_state.foreground);
84	adx	30	}
85
86			/*
87			* setup_signals - initialize signal handlers for server
88			*/
89			void
90			setup_signals(void)
91			{
92			struct sigaction act;
93
94			act.sa_flags = 0;
95			act.sa_handler = SIG_IGN;
96	michael	594
97	adx	30	sigemptyset(&act.sa_mask);
98	michael	2834	#ifdef SIGXFSZ
99			sigaddset(&act.sa_mask, SIGXFSZ);
100			#endif
101			#ifdef SIGWINCH
102			sigaddset(&act.sa_mask, SIGWINCH);
103			#endif
104	adx	30	#ifdef SIGTRAP
105			sigaddset(&act.sa_mask, SIGTRAP);
106			#endif
107	michael	2834	sigaddset(&act.sa_mask, SIGPIPE);
108			sigaddset(&act.sa_mask, SIGALRM);
109			sigaddset(&act.sa_mask, SIGHUP);
110			sigaddset(&act.sa_mask, SIGINT);
111			sigaddset(&act.sa_mask, SIGTERM);
112			sigaddset(&act.sa_mask, SIGUSR1);
113			sigaddset(&act.sa_mask, SIGCHLD);
114
115	michael	594	#ifdef SIGXFSZ
116			sigaction(SIGXFSZ, &act, 0);
117			#endif
118	adx	30	#ifdef SIGWINCH
119			sigaction(SIGWINCH, &act, 0);
120			#endif
121			#ifdef SIGTRAP
122			sigaction(SIGTRAP, &act, 0);
123			#endif
124	michael	2834	sigaction(SIGPIPE, &act, 0);
125			sigaction(SIGALRM, &act, 0);
126	adx	30
127			act.sa_handler = sighup_handler;
128			sigaction(SIGHUP, &act, 0);
129
130			act.sa_handler = sigint_handler;
131			sigaction(SIGINT, &act, 0);
132
133			act.sa_handler = sigterm_handler;
134			sigaction(SIGTERM, &act, 0);
135
136			act.sa_handler = sigusr1_handler;
137			sigaction(SIGUSR1, &act, 0);
138
139			act.sa_handler = sigchld_handler;
140			sigaction(SIGCHLD, &act, 0);
141	michael	2834
142			sigprocmask(SIG_UNBLOCK, &act.sa_mask, NULL);
143	adx	30	}