2 This file is part of GNUnet.
3 Copyright (C) 2001, 2002, 2006 GNUnet e.V.
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.
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.
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/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
23 * @brief code for installing and uninstalling signal handlers
24 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
30 #define LOG(kind, ...) GNUNET_log_from(kind, "util-signal", __VA_ARGS__)
33 struct GNUNET_SIGNAL_Context {
34 struct GNUNET_SIGNAL_Context *next;
36 struct GNUNET_SIGNAL_Context *prev;
40 GNUNET_SIGNAL_Handler method;
42 struct sigaction oldsig;
45 static struct GNUNET_SIGNAL_Context *sc_head;
47 static struct GNUNET_SIGNAL_Context *sc_tail;
49 struct GNUNET_SIGNAL_Context *
50 GNUNET_SIGNAL_handler_install(int signum, GNUNET_SIGNAL_Handler handler)
52 struct GNUNET_SIGNAL_Context *ret;
56 ret = GNUNET_new(struct GNUNET_SIGNAL_Context);
58 ret->method = handler;
60 memset(&sig, 0, sizeof(sig));
61 sig.sa_handler = (void *)handler;
62 sigemptyset(&sig.sa_mask);
64 sig.sa_flags = SA_INTERRUPT; /* SunOS */
66 sig.sa_flags = SA_RESTART;
68 sigaction(signum, &sig, &ret->oldsig);
70 GNUNET_CONTAINER_DLL_insert_tail(sc_head, sc_tail, ret);
75 GNUNET_SIGNAL_handler_uninstall(struct GNUNET_SIGNAL_Context *ctx)
79 sigemptyset(&sig.sa_mask);
80 sigaction(ctx->sig, &ctx->oldsig, &sig);
82 GNUNET_CONTAINER_DLL_remove(sc_head, sc_tail, ctx);
88 * Raise the given signal by calling the installed signal handlers. This will
89 * not use the @em raise() system call but only calls the handlers registered
90 * through GNUNET_SIGNAL_handler_install().
92 * @param sig the signal to raise
95 GNUNET_SIGNAL_raise(const int sig)
97 struct GNUNET_SIGNAL_Context *ctx;
99 for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
103 if (NULL == ctx->method)