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/*
This file is part of GNUnet.
(C) 2001, 2002, 2006 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file util/signal.c
* @brief code for installing and uninstalling signal handlers
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_signal_lib.h"
#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
struct GNUNET_SIGNAL_Context
{
int sig;
GNUNET_SIGNAL_Handler method;
#ifndef MINGW
struct sigaction oldsig;
#endif
};
#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_malloc (sizeof (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
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_free (ctx);
}
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