OpenDNSSEC-signer  1.4.3
signal.c
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1 /*
2  * $Id: signal.c 5548 2011-09-05 14:29:25Z matthijs $
3  *
4  * Copyright (c) 2009 NLNet Labs. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
21  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
23  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
25  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  */
28 
34 #include "config.h"
35 #include "daemon/engine.h"
36 #include "daemon/signal.h"
37 #include "shared/locks.h"
38 #include "shared/log.h"
39 
40 #include <signal.h>
41 
42 static int signal_hup_recvd = 0;
43 static int signal_term_recvd = 0;
44 static engine_type* signal_engine = NULL;
45 static const char* signal_str = "signal";
46 
47 
52 void
53 signal_set_engine(void* engine)
54 {
55  signal_engine = (engine_type*) engine;
56  return;
57 }
58 
59 
64 void
65 signal_handler(sig_atomic_t sig)
66 {
67  switch (sig) {
68  case SIGHUP:
69  ods_log_debug("[%s] SIGHUP received", signal_str);
70  signal_hup_recvd++;
71  if (signal_engine) {
72  lock_basic_lock(&signal_engine->signal_lock);
73  /* [LOCK] signal */
74  lock_basic_alarm(&signal_engine->signal_cond);
75  /* [UNLOCK] signal */
76  lock_basic_unlock(&signal_engine->signal_lock);
77  }
78  break;
79  case SIGTERM:
80  ods_log_debug("[%s] SIGTERM received", signal_str);
81  signal_term_recvd++;
82  if (signal_engine) {
83  lock_basic_lock(&signal_engine->signal_lock);
84  /* [LOCK] signal */
85  lock_basic_alarm(&signal_engine->signal_cond);
86  /* [UNLOCK] signal */
87  lock_basic_unlock(&signal_engine->signal_lock);
88  }
89  break;
90  default:
91  break;
92  }
93  return;
94 }
95 
96 
101 sig_atomic_t
102 signal_capture(sig_atomic_t dflsig)
103 {
104  if (signal_term_recvd) {
105  signal_term_recvd = 0;
106  return SIGNAL_SHUTDOWN;
107  } else if (signal_hup_recvd) {
108  signal_hup_recvd = 0;
109  return SIGNAL_RELOAD;
110  }
111  return dflsig;
112 }
void ods_log_debug(const char *format,...)
Definition: log.c:272
cond_basic_type signal_cond
Definition: engine.h:80
void signal_set_engine(void *engine)
Definition: signal.c:53
#define SIGNAL_RELOAD
Definition: signal.h:43
lock_basic_type signal_lock
Definition: engine.h:81
sig_atomic_t signal_capture(sig_atomic_t dflsig)
Definition: signal.c:102
#define lock_basic_lock(lock)
Definition: locks.h:93
void signal_handler(sig_atomic_t sig)
Definition: signal.c:65
#define SIGNAL_SHUTDOWN
Definition: signal.h:44
#define lock_basic_alarm(cond)
Definition: locks.h:98
#define lock_basic_unlock(lock)
Definition: locks.h:94