GNUnet  0.11.x
signal.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2001, 2002, 2006 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
27 #include "platform.h"
28 #include "gnunet_util_lib.h"
29 
30 #define LOG(kind, ...) GNUNET_log_from (kind, "util-signal", __VA_ARGS__)
31 
32 
34 {
36 
38 
39  int sig;
40 
42 
43  struct sigaction oldsig;
44 };
45 
47 
49 
50 struct GNUNET_SIGNAL_Context *
52 {
53  struct GNUNET_SIGNAL_Context *ret;
54 
55  struct sigaction sig;
56 
57  ret = GNUNET_new (struct GNUNET_SIGNAL_Context);
58  ret->sig = signum;
59  ret->method = handler;
60 
61  memset (&sig, 0, sizeof(sig));
62  sig.sa_handler = (void *) handler;
63  sigemptyset (&sig.sa_mask);
64 #ifdef SA_INTERRUPT
65  sig.sa_flags = SA_INTERRUPT; /* SunOS */
66 #else
67  sig.sa_flags = SA_RESTART;
68 #endif
69  sigaction (signum, &sig, &ret->oldsig);
70 
71  GNUNET_CONTAINER_DLL_insert_tail (sc_head, sc_tail, ret);
72  return ret;
73 }
74 
75 
76 void
78 {
79  struct sigaction sig;
80 
81  sigemptyset (&sig.sa_mask);
82  sigaction (ctx->sig, &ctx->oldsig, &sig);
83 
84  GNUNET_CONTAINER_DLL_remove (sc_head, sc_tail, ctx);
85  GNUNET_free (ctx);
86 }
87 
88 
96 void
98 {
99  struct GNUNET_SIGNAL_Context *ctx;
100 
101  for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
102  {
103  if (sig != ctx->sig)
104  continue;
105  if (NULL == ctx->method)
106  continue;
107  ctx->method ();
108  }
109 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
void GNUNET_SIGNAL_raise(const int sig)
Raise the given signal by calling the installed signal handlers.
Definition: signal.c:97
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
void GNUNET_SIGNAL_handler_uninstall(struct GNUNET_SIGNAL_Context *ctx)
Uninstall a previously installed signal hander.
Definition: signal.c:77
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static struct GNUNET_DNSSTUB_Context * ctx
Context for DNS resolution.
static struct GNUNET_SIGNAL_Context * sc_head
Definition: signal.c:46
struct GNUNET_SIGNAL_Context * GNUNET_SIGNAL_handler_install(int signum, GNUNET_SIGNAL_Handler handler)
Install a signal handler that will be run if the given signal is received.
Definition: signal.c:51
struct GNUNET_SIGNAL_Context * prev
Definition: signal.c:37
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
GNUNET_SIGNAL_Handler method
Definition: signal.c:41
struct GNUNET_SIGNAL_Context * next
Definition: signal.c:35
static struct GNUNET_SIGNAL_Context * sc_tail
Definition: signal.c:48
struct sigaction oldsig
Definition: signal.c:43
#define GNUNET_free(ptr)
Wrapper around free.
void(* GNUNET_SIGNAL_Handler)(void)
A signal handler.