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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;
#ifndef MINGW
struct sigaction oldsig;
#endif
};
static struct GNUNET_SIGNAL_Context *sc_head;
static struct GNUNET_SIGNAL_Context *sc_tail;
#ifdef WINDOWS
GNUNET_SIGNAL_Handler w32_sigchld_handler = NULL;
#endif
struct GNUNET_SIGNAL_Context *
GNUNET_SIGNAL_handler_install (int signum, GNUNET_SIGNAL_Handler handler)
{
struct GNUNET_SIGNAL_Context *ret;
#ifndef MINGW
struct sigaction sig;
#endif
ret = GNUNET_new (struct GNUNET_SIGNAL_Context);
ret->sig = signum;
ret->method = handler;
#ifndef MINGW
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);
#else
if (signum == GNUNET_SIGCHLD)
w32_sigchld_handler = handler;
else
{
__p_sig_fn_t sigret = signal (signum, (__p_sig_fn_t) handler);
if (sigret == SIG_ERR)
{
LOG (GNUNET_ERROR_TYPE_WARNING, _("signal (%d, %p) returned %d.\n"),
signum, handler, sigret);
}
}
#endif
GNUNET_CONTAINER_DLL_insert_tail (sc_head, sc_tail, ret);
return ret;
}
void
GNUNET_SIGNAL_handler_uninstall (struct GNUNET_SIGNAL_Context *ctx)
{
#ifndef MINGW
struct sigaction sig;
sigemptyset (&sig.sa_mask);
sigaction (ctx->sig, &ctx->oldsig, &sig);
#endif
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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