GNUnet  0.19.3
signal.c
Go to the documentation of this file.
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 
28 #include "platform.h"
29 #include "gnunet_util_lib.h"
30 
31 #define LOG(kind, ...) GNUNET_log_from (kind, "util-signal", __VA_ARGS__)
32 
33 
35 {
37 
39 
40  int sig;
41 
43 
44  struct sigaction oldsig;
45 };
46 
48 
50 
51 struct GNUNET_SIGNAL_Context *
53 {
54  struct GNUNET_SIGNAL_Context *ret;
55 
56  struct sigaction sig;
57 
59  ret->sig = signum;
60  ret->method = handler;
61 
62  memset (&sig, 0, sizeof(sig));
63  sig.sa_handler = (void *) handler;
64  sigemptyset (&sig.sa_mask);
65 #ifdef SA_INTERRUPT
66  sig.sa_flags = SA_INTERRUPT; /* SunOS */
67 #else
68  sig.sa_flags = SA_RESTART;
69 #endif
70  sigaction (signum, &sig, &ret->oldsig);
71 
73  return ret;
74 }
75 
76 
77 void
79 {
80  struct sigaction sig;
81 
82  sigemptyset (&sig.sa_mask);
83  sigaction (ctx->sig, &ctx->oldsig, &sig);
84 
86  GNUNET_free (ctx);
87 }
88 
89 
97 void
98 GNUNET_SIGNAL_raise (const int sig)
99 {
100  struct GNUNET_SIGNAL_Context *ctx;
101 
102  for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
103  {
104  if (sig != ctx->sig)
105  continue;
106  if (NULL == ctx->method)
107  continue;
108  ctx->method ();
109  }
110 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static struct GNUNET_DNSSTUB_Context * ctx
Context for DNS resolution.
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_free(ptr)
Wrapper around free.
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:52
void(* GNUNET_SIGNAL_Handler)(void)
A signal handler.
void GNUNET_SIGNAL_raise(const int sig)
Raise the given signal by calling the installed signal handlers.
Definition: signal.c:98
void GNUNET_SIGNAL_handler_uninstall(struct GNUNET_SIGNAL_Context *ctx)
Uninstall a previously installed signal handler.
Definition: signal.c:78
static struct GNUNET_SIGNAL_Context * sc_head
Definition: signal.c:47
static struct GNUNET_SIGNAL_Context * sc_tail
Definition: signal.c:49
struct GNUNET_SIGNAL_Context * next
Definition: signal.c:36
struct GNUNET_SIGNAL_Context * prev
Definition: signal.c:38
struct sigaction oldsig
Definition: signal.c:44
GNUNET_SIGNAL_Handler method
Definition: signal.c:42