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
35 struct GNUNET_SIGNAL_Context *next;
37 struct GNUNET_SIGNAL_Context *prev;
41 GNUNET_SIGNAL_Handler method;
43 struct sigaction oldsig;
46 static struct GNUNET_SIGNAL_Context *sc_head;
48 static struct GNUNET_SIGNAL_Context *sc_tail;
50 struct GNUNET_SIGNAL_Context *
51 GNUNET_SIGNAL_handler_install (int signum, GNUNET_SIGNAL_Handler handler)
53 struct GNUNET_SIGNAL_Context *ret;
57 ret = GNUNET_new (struct GNUNET_SIGNAL_Context);
59 ret->method = handler;
61 memset (&sig, 0, sizeof(sig));
62 sig.sa_handler = (void *) handler;
63 sigemptyset (&sig.sa_mask);
65 sig.sa_flags = SA_INTERRUPT; /* SunOS */
67 sig.sa_flags = SA_RESTART;
69 sigaction (signum, &sig, &ret->oldsig);
71 GNUNET_CONTAINER_DLL_insert_tail (sc_head, sc_tail, ret);
76 GNUNET_SIGNAL_handler_uninstall (struct GNUNET_SIGNAL_Context *ctx)
80 sigemptyset (&sig.sa_mask);
81 sigaction (ctx->sig, &ctx->oldsig, &sig);
83 GNUNET_CONTAINER_DLL_remove (sc_head, sc_tail, ctx);
89 * Raise the given signal by calling the installed signal handlers. This will
90 * not use the @em raise() system call but only calls the handlers registered
91 * through GNUNET_SIGNAL_handler_install().
93 * @param sig the signal to raise
96 GNUNET_SIGNAL_raise (const int sig)
98 struct GNUNET_SIGNAL_Context *ctx;
100 for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
104 if (NULL == ctx->method)