OpenDNSSEC-signer  2.0.4
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 "locks.h"
36 #include "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 }
55 
56 
61 void *
62 signal_handler(sig_atomic_t sig)
63 {
64  switch (sig) {
65  case SIGHUP:
66  ods_log_debug("[%s] SIGHUP received", signal_str);
67  signal_hup_recvd++;
68  if (signal_engine) {
69  lock_basic_lock(&signal_engine->signal_lock);
70  /* [LOCK] signal */
71  lock_basic_alarm(&signal_engine->signal_cond);
72  /* [UNLOCK] signal */
73  lock_basic_unlock(&signal_engine->signal_lock);
74  }
75  break;
76  case SIGINT:
77  case SIGTERM:
78  ods_log_debug("[%s] SIGTERM received", signal_str);
79  signal_term_recvd++;
80  if (signal_engine) {
81  lock_basic_lock(&signal_engine->signal_lock);
82  /* [LOCK] signal */
83  lock_basic_alarm(&signal_engine->signal_cond);
84  /* [UNLOCK] signal */
85  lock_basic_unlock(&signal_engine->signal_lock);
86  }
87  break;
88  default:
89  break;
90  }
91  return NULL;
92 }
93 
94 
99 sig_atomic_t
100 signal_capture(sig_atomic_t dflsig)
101 {
102  if (signal_term_recvd) {
103  signal_term_recvd = 0;
104  return SIGNAL_SHUTDOWN;
105  } else if (signal_hup_recvd) {
106  signal_hup_recvd = 0;
107  return SIGNAL_RELOAD;
108  }
109  return dflsig;
110 }
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:100
void * signal_handler(sig_atomic_t sig)
Definition: signal.c:62
#define SIGNAL_SHUTDOWN
Definition: signal.h:42