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- /*
- This file is part of GNUnet.
- Copyright (C) 2001, 2002, 2006 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file util/signal.c
- * @brief code for installing and uninstalling signal handlers
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #define LOG(kind, ...) GNUNET_log_from (kind, "util-signal", __VA_ARGS__)
- struct GNUNET_SIGNAL_Context
- {
- struct GNUNET_SIGNAL_Context *next;
- struct GNUNET_SIGNAL_Context *prev;
- int sig;
- GNUNET_SIGNAL_Handler method;
- struct sigaction oldsig;
- };
- static struct GNUNET_SIGNAL_Context *sc_head;
- static struct GNUNET_SIGNAL_Context *sc_tail;
- struct GNUNET_SIGNAL_Context *
- GNUNET_SIGNAL_handler_install (int signum, GNUNET_SIGNAL_Handler handler)
- {
- struct GNUNET_SIGNAL_Context *ret;
- struct sigaction sig;
- ret = GNUNET_new (struct GNUNET_SIGNAL_Context);
- ret->sig = signum;
- ret->method = handler;
- memset (&sig, 0, sizeof(sig));
- sig.sa_handler = (void *) handler;
- sigemptyset (&sig.sa_mask);
- #ifdef SA_INTERRUPT
- sig.sa_flags = SA_INTERRUPT; /* SunOS */
- #else
- sig.sa_flags = SA_RESTART;
- #endif
- sigaction (signum, &sig, &ret->oldsig);
- GNUNET_CONTAINER_DLL_insert_tail (sc_head, sc_tail, ret);
- return ret;
- }
- void
- GNUNET_SIGNAL_handler_uninstall (struct GNUNET_SIGNAL_Context *ctx)
- {
- struct sigaction sig;
- sigemptyset (&sig.sa_mask);
- sigaction (ctx->sig, &ctx->oldsig, &sig);
- GNUNET_CONTAINER_DLL_remove (sc_head, sc_tail, ctx);
- GNUNET_free (ctx);
- }
- /**
- * Raise the given signal by calling the installed signal handlers. This will
- * not use the @em raise() system call but only calls the handlers registered
- * through GNUNET_SIGNAL_handler_install().
- *
- * @param sig the signal to raise
- */
- void
- GNUNET_SIGNAL_raise (const int sig)
- {
- struct GNUNET_SIGNAL_Context *ctx;
- for (ctx = sc_head; NULL != ctx; ctx = ctx->next)
- {
- if (sig != ctx->sig)
- continue;
- if (NULL == ctx->method)
- continue;
- ctx->method ();
- }
- }
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