222 lines
3.8 KiB
C
222 lines
3.8 KiB
C
/*
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* Copyright (c) 1999-2004 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: signal.c,v 8.42 2004/08/20 21:10:30 ca Exp $")
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#include "libmilter.h"
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/*
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** thread to handle signals
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*/
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static smutex_t M_Mutex;
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static int MilterStop = MILTER_CONT;
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static void *mi_signal_thread __P((void *));
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static int mi_spawn_signal_thread __P((char *));
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/*
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** MI_STOP -- return value of MilterStop
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**
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** Parameters:
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** none.
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**
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** Returns:
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** value of MilterStop
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*/
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int
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mi_stop()
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{
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return MilterStop;
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}
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/*
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** MI_STOP_MILTERS -- set value of MilterStop
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**
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** Parameters:
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** v -- new value for MilterStop.
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**
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** Returns:
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** none.
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*/
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void
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mi_stop_milters(v)
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int v;
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{
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(void) smutex_lock(&M_Mutex);
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if (MilterStop < v)
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MilterStop = v;
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/* close listen socket */
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mi_closener();
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(void) smutex_unlock(&M_Mutex);
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}
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/*
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** MI_CLEAN_SIGNALS -- clean up signal handler thread
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**
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** Parameters:
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** none.
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**
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** Returns:
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** none.
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*/
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void
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mi_clean_signals()
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{
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(void) smutex_destroy(&M_Mutex);
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}
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/*
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** MI_SIGNAL_THREAD -- thread to deal with signals
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**
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** Parameters:
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** name -- name of milter
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**
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** Returns:
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** NULL
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*/
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static void *
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mi_signal_thread(name)
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void *name;
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{
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int sig, errs;
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sigset_t set;
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(void) sigemptyset(&set);
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(void) sigaddset(&set, SIGHUP);
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(void) sigaddset(&set, SIGTERM);
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/* Handle Ctrl-C gracefully for debugging */
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(void) sigaddset(&set, SIGINT);
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errs = 0;
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for (;;)
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{
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sig = 0;
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#if defined(SOLARIS) || defined(__svr5__)
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if ((sig = sigwait(&set)) < 0)
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#else /* defined(SOLARIS) || defined(__svr5__) */
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if (sigwait(&set, &sig) != 0)
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#endif /* defined(SOLARIS) || defined(__svr5__) */
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{
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/* this can happen on OSF/1 (at least) */
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if (errno == EINTR)
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continue;
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smi_log(SMI_LOG_ERR,
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"%s: sigwait returned error: %d",
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(char *)name, errno);
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if (++errs > MAX_FAILS_T)
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{
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mi_stop_milters(MILTER_ABRT);
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return NULL;
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}
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continue;
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}
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errs = 0;
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switch (sig)
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{
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case SIGHUP:
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case SIGTERM:
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mi_stop_milters(MILTER_STOP);
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return NULL;
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case SIGINT:
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mi_stop_milters(MILTER_ABRT);
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return NULL;
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default:
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smi_log(SMI_LOG_ERR,
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"%s: sigwait returned unmasked signal: %d",
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(char *)name, sig);
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break;
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}
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}
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/* NOTREACHED */
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}
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/*
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** MI_SPAWN_SIGNAL_THREAD -- spawn thread to handle signals
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**
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** Parameters:
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** name -- name of milter
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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static int
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mi_spawn_signal_thread(name)
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char *name;
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{
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sthread_t tid;
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int r;
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sigset_t set;
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/* Mask HUP and KILL signals */
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(void) sigemptyset(&set);
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(void) sigaddset(&set, SIGHUP);
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(void) sigaddset(&set, SIGTERM);
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(void) sigaddset(&set, SIGINT);
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if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0)
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{
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smi_log(SMI_LOG_ERR,
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"%s: Couldn't mask HUP and KILL signals", name);
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return MI_FAILURE;
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}
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r = thread_create(&tid, mi_signal_thread, (void *)name);
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if (r != 0)
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{
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smi_log(SMI_LOG_ERR,
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"%s: Couldn't start signal thread: %d",
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name, r);
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return MI_FAILURE;
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}
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return MI_SUCCESS;
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}
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/*
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** MI_CONTROL_STARTUP -- startup for thread to handle signals
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**
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** Parameters:
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** name -- name of milter
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**
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** Returns:
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** MI_SUCCESS/MI_FAILURE
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*/
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int
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mi_control_startup(name)
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char *name;
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{
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if (!smutex_init(&M_Mutex))
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{
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smi_log(SMI_LOG_ERR,
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"%s: Couldn't initialize control pipe mutex", name);
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return MI_FAILURE;
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}
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/*
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** spawn_signal_thread must happen before other threads are spawned
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** off so that it can mask the right signals and other threads
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** will inherit that mask.
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*/
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if (mi_spawn_signal_thread(name) == MI_FAILURE)
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{
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smi_log(SMI_LOG_ERR,
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"%s: Couldn't spawn signal thread", name);
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(void) smutex_destroy(&M_Mutex);
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return MI_FAILURE;
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}
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return MI_SUCCESS;
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}
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