OpenDNSSEC-signer  1.4.9
signal.c
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1 /*
2  * Copyright (c) 2009 NLNet Labs. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  * notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  * notice, this list of conditions and the following disclaimer in the
11  * documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
19  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
21  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
23  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  *
25  */
26 
32 #include "config.h"
33 #include "daemon/engine.h"
34 #include "daemon/signal.h"
35 #include "shared/locks.h"
36 #include "shared/log.h"
37 
38 #include <signal.h>
39 
40 static int signal_hup_recvd = 0;
41 static int signal_term_recvd = 0;
42 static engine_type* signal_engine = NULL;
43 static const char* signal_str = "signal";
44 
45 
50 void
51 signal_set_engine(void* engine)
52 {
53  signal_engine = (engine_type*) engine;
54  return;
55 }
56 
57 
62 void
63 signal_handler(sig_atomic_t sig)
64 {
65  switch (sig) {
66  case SIGHUP:
67  ods_log_debug("[%s] SIGHUP received", signal_str);
68  signal_hup_recvd++;
69  if (signal_engine) {
70  lock_basic_lock(&signal_engine->signal_lock);
71  /* [LOCK] signal */
72  lock_basic_alarm(&signal_engine->signal_cond);
73  /* [UNLOCK] signal */
74  lock_basic_unlock(&signal_engine->signal_lock);
75  }
76  break;
77  case SIGINT:
78  case SIGTERM:
79  ods_log_debug("[%s] SIGTERM received", signal_str);
80  signal_term_recvd++;
81  if (signal_engine) {
82  lock_basic_lock(&signal_engine->signal_lock);
83  /* [LOCK] signal */
84  lock_basic_alarm(&signal_engine->signal_cond);
85  /* [UNLOCK] signal */
86  lock_basic_unlock(&signal_engine->signal_lock);
87  }
88  break;
89  default:
90  break;
91  }
92  return;
93 }
94 
95 
100 sig_atomic_t
101 signal_capture(sig_atomic_t dflsig)
102 {
103  if (signal_term_recvd) {
104  signal_term_recvd = 0;
105  return SIGNAL_SHUTDOWN;
106  } else if (signal_hup_recvd) {
107  signal_hup_recvd = 0;
108  return SIGNAL_RELOAD;
109  }
110  return dflsig;
111 }
void ods_log_debug(const char *format,...)
Definition: log.c:270
cond_basic_type signal_cond
Definition: engine.h:78
void signal_set_engine(void *engine)
Definition: signal.c:51
#define SIGNAL_RELOAD
Definition: signal.h:41
lock_basic_type signal_lock
Definition: engine.h:79
sig_atomic_t signal_capture(sig_atomic_t dflsig)
Definition: signal.c:101
#define lock_basic_lock(lock)
Definition: locks.h:94
void signal_handler(sig_atomic_t sig)
Definition: signal.c:63
#define SIGNAL_SHUTDOWN
Definition: signal.h:42
#define lock_basic_alarm(cond)
Definition: locks.h:99
#define lock_basic_unlock(lock)
Definition: locks.h:95