GNUnet  0.10.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 {
35 
37 
39 
40  int sig;
41 
43 
44 #ifndef MINGW
45  struct sigaction oldsig;
46 #endif
47 };
48 
50 
52 
53 
54 #ifdef WINDOWS
55 GNUNET_SIGNAL_Handler w32_sigchld_handler = NULL;
56 #endif
57 
58 struct GNUNET_SIGNAL_Context *
60 {
61  struct GNUNET_SIGNAL_Context *ret;
62 
63 #ifndef MINGW
64  struct sigaction sig;
65 #endif
66 
67  ret = GNUNET_new (struct GNUNET_SIGNAL_Context);
68  ret->sig = signum;
69  ret->method = handler;
70 #ifndef MINGW
71  memset (&sig, 0, sizeof (sig));
72  sig.sa_handler = (void *) handler;
73  sigemptyset (&sig.sa_mask);
74 #ifdef SA_INTERRUPT
75  sig.sa_flags = SA_INTERRUPT; /* SunOS */
76 #else
77  sig.sa_flags = SA_RESTART;
78 #endif
79  sigaction (signum, &sig, &ret->oldsig);
80 #else
81  if (signum == GNUNET_SIGCHLD)
82  w32_sigchld_handler = handler;
83  else
84  {
85  __p_sig_fn_t sigret = signal (signum, (__p_sig_fn_t) handler);
86 
87  if (sigret == SIG_ERR)
88  {
89  LOG (GNUNET_ERROR_TYPE_WARNING, _("signal (%d, %p) returned %d.\n"),
90  signum, handler, sigret);
91  }
92  }
93 #endif
94  GNUNET_CONTAINER_DLL_insert_tail (sc_head, sc_tail, ret);
95  return ret;
96 }
97 
98 void
100 {
101 #ifndef MINGW
102  struct sigaction sig;
103 
104  sigemptyset (&sig.sa_mask);
105  sigaction (ctx->sig, &ctx->oldsig, &sig);
106 #endif
107  GNUNET_CONTAINER_DLL_remove (sc_head, sc_tail, ctx);
108  GNUNET_free (ctx);
109 }
110 
111 
119 void
121 {
122  struct GNUNET_SIGNAL_Context *ctx;
123 
124  for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
125  {
126  if (sig != ctx->sig)
127  continue;
128  if (NULL == ctx->method)
129  continue;
130  ctx->method ();
131  }
132 }
#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:120
#define GNUNET_SIGCHLD
Definition: platform.h:46
void GNUNET_SIGNAL_handler_uninstall(struct GNUNET_SIGNAL_Context *ctx)
Uninstall a previously installed signal hander.
Definition: signal.c:99
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static int ret
Final status code.
Definition: gnunet-arm.c:89
static struct GNUNET_DNSSTUB_Context * ctx
Context for DNS resolution.
#define _(String)
GNU gettext support macro.
Definition: platform.h:208
static struct GNUNET_SIGNAL_Context * sc_head
Definition: signal.c:49
#define LOG(kind,...)
Definition: signal.c:30
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:59
struct GNUNET_SIGNAL_Context * prev
Definition: signal.c:38
#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:42
struct GNUNET_SIGNAL_Context * next
Definition: signal.c:36
static struct GNUNET_SIGNAL_Context * sc_tail
Definition: signal.c:51
struct sigaction oldsig
Definition: signal.c:45
#define GNUNET_free(ptr)
Wrapper around free.
void(* GNUNET_SIGNAL_Handler)(void)
A signal handler.