2 * Copyright (c) 1999-2004, 2006 Sendmail, Inc. and its suppliers.
5 * By using this file, you agree to the terms and conditions set
6 * forth in the LICENSE file which can be found at the top level of
7 * the sendmail distribution.
12 SM_RCSID("@(#)$Id: signal.c,v 8.44 2006/03/03 03:42:04 ca Exp $")
14 #include "libmilter.h"
17 ** thread to handle signals
20 static smutex_t M_Mutex;
22 static int MilterStop = MILTER_CONT;
24 static void *mi_signal_thread __P((void *));
25 static int mi_spawn_signal_thread __P((char *));
28 ** MI_STOP -- return value of MilterStop
34 ** value of MilterStop
43 ** MI_STOP_MILTERS -- set value of MilterStop
46 ** v -- new value for MilterStop.
56 (void) smutex_lock(&M_Mutex);
60 /* close listen socket */
62 (void) smutex_unlock(&M_Mutex);
65 ** MI_CLEAN_SIGNALS -- clean up signal handler thread
77 (void) smutex_destroy(&M_Mutex);
80 ** MI_SIGNAL_THREAD -- thread to deal with signals
83 ** name -- name of milter
90 mi_signal_thread(name)
93 int sig, errs, sigerr;
96 (void) sigemptyset(&set);
97 (void) sigaddset(&set, SIGHUP);
98 (void) sigaddset(&set, SIGTERM);
100 /* Handle Ctrl-C gracefully for debugging */
101 (void) sigaddset(&set, SIGINT);
107 #if defined(SOLARIS) || defined(__svr5__)
108 if ((sig = sigwait(&set)) < 0)
109 #else /* defined(SOLARIS) || defined(__svr5__) */
110 if ((sigerr = sigwait(&set, &sig)) != 0)
111 #endif /* defined(SOLARIS) || defined(__svr5__) */
113 /* some OS return -1 and set errno: copy it */
117 /* this can happen on OSF/1 (at least) */
121 "%s: sigwait returned error: %d",
122 (char *)name, sigerr);
123 if (++errs > MAX_FAILS_T)
125 mi_stop_milters(MILTER_ABRT);
136 mi_stop_milters(MILTER_STOP);
139 mi_stop_milters(MILTER_ABRT);
143 "%s: sigwait returned unmasked signal: %d",
151 ** MI_SPAWN_SIGNAL_THREAD -- spawn thread to handle signals
154 ** name -- name of milter
157 ** MI_SUCCESS/MI_FAILURE
161 mi_spawn_signal_thread(name)
168 /* Mask HUP and KILL signals */
169 (void) sigemptyset(&set);
170 (void) sigaddset(&set, SIGHUP);
171 (void) sigaddset(&set, SIGTERM);
172 (void) sigaddset(&set, SIGINT);
174 if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0)
177 "%s: Couldn't mask HUP and KILL signals", name);
180 r = thread_create(&tid, mi_signal_thread, (void *)name);
184 "%s: Couldn't start signal thread: %d",
191 ** MI_CONTROL_STARTUP -- startup for thread to handle signals
194 ** name -- name of milter
197 ** MI_SUCCESS/MI_FAILURE
201 mi_control_startup(name)
205 if (!smutex_init(&M_Mutex))
208 "%s: Couldn't initialize control pipe mutex", name);
213 ** spawn_signal_thread must happen before other threads are spawned
214 ** off so that it can mask the right signals and other threads
215 ** will inherit that mask.
217 if (mi_spawn_signal_thread(name) == MI_FAILURE)
220 "%s: Couldn't spawn signal thread", name);
221 (void) smutex_destroy(&M_Mutex);