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/build/buildd-opendnssec_1.3.2-1~bpo60+1-s390-eF9Mr1/opendnssec-1.3.2/signer/src/daemon/signal.c

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00001 /*
00002  * $Id: signal.c 4349 2011-02-01 10:42:53Z matthijs $
00003  *
00004  * Copyright (c) 2009 NLNet Labs. All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  *
00015  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00016  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00017  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00018  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
00019  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00020  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
00021  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
00023  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
00024  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
00025  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00026  *
00027  */
00028 
00034 #include "config.h"
00035 #include "daemon/engine.h"
00036 #include "daemon/signal.h"
00037 #include "shared/locks.h"
00038 #include "shared/log.h"
00039 
00040 #include <signal.h>
00041 
00042 static int signal_hup_recvd = 0;
00043 static int signal_term_recvd = 0;
00044 static engine_type* signal_engine = NULL;
00045 static const char* signal_str = "signal";
00046 
00047 
00052 void
00053 signal_set_engine(struct engine_struct* engine)
00054 {
00055     signal_engine = (engine_type*) engine;
00056 }
00057 
00058 
00063 void
00064 signal_handler(sig_atomic_t sig)
00065 {
00066     switch (sig) {
00067         case SIGHUP:
00068             ods_log_debug("[%s] SIGHUP received", signal_str);
00069             signal_hup_recvd++;
00070             if (signal_engine) {
00071                 lock_basic_lock(&signal_engine->signal_lock);
00072                 /* [LOCK] signal */
00073                 lock_basic_alarm(&signal_engine->signal_cond);
00074                 /* [UNLOCK] signal */
00075                 lock_basic_unlock(&signal_engine->signal_lock);
00076             }
00077             break;
00078         case SIGTERM:
00079             ods_log_debug("[%s] SIGTERM received", signal_str);
00080             signal_term_recvd++;
00081             if (signal_engine) {
00082                 lock_basic_lock(&signal_engine->signal_lock);
00083                 /* [LOCK] signal */
00084                 lock_basic_alarm(&signal_engine->signal_cond);
00085                 /* [UNLOCK] signal */
00086                 lock_basic_unlock(&signal_engine->signal_lock);
00087             }
00088             break;
00089         default:
00090             break;
00091     }
00092     return;
00093 }
00094 
00095 
00100 sig_atomic_t
00101 signal_capture(sig_atomic_t dflsig)
00102 {
00103     if (signal_term_recvd) {
00104         signal_term_recvd = 0;
00105         return SIGNAL_SHUTDOWN;
00106     } else if (signal_hup_recvd) {
00107         signal_hup_recvd = 0;
00108         return SIGNAL_RELOAD;
00109     }
00110     return dflsig;
00111 }

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