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/* Copyright 1996,1997,2001,2002,2007,2009 Alain Knaff.
* This file is part of mtools.
*
* Mtools 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 3 of the License, or
* (at your option) any later version.
*
* Mtools 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 Mtools. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sysincludes.h"
#include "mtools.h"
#undef got_signal
int got_signal = 0;
static void signal_handler(int dummy UNUSEDP)
{
got_signal = 1;
#if 0
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
#endif
}
#if 0
int do_gotsignal(char *f, int n)
{
if(got_signal)
fprintf(stderr, "file=%s line=%d\n", f, n);
return got_signal;
}
#endif
void setup_signal(void)
{
/* catch signals */
#ifdef SIGHUP
signal(SIGHUP, signal_handler);
#endif
#ifdef SIGINT
signal(SIGINT, signal_handler);
#endif
#ifdef SIGTERM
signal(SIGTERM, signal_handler);
#endif
#ifdef SIGQUIT
signal(SIGQUIT, signal_handler);
#endif
}
#ifdef HAVE_SIGACTION
static void _allow_interrupt(saved_sig_state *ss, int sig, int slot)
{
struct sigaction new;
memset(&new, 0, sizeof(new));
new.sa_handler = signal_handler;
new.sa_flags &= ~SA_RESTART;
if(sigaction(sig, &new, &ss->sa[slot]) < 0) {
perror("sigaction");
exit(1);
}
}
#endif
/* Allow syscalls to be interrupted by signal */
void allow_interrupts(saved_sig_state *ss)
{
#ifdef HAVE_SIGACTION
# ifdef SIGHUP
_allow_interrupt(ss, SIGINT, 0);
# endif
# ifdef SIGINT
_allow_interrupt(ss, SIGINT, 1);
# endif
# ifdef SIGTERM
_allow_interrupt(ss, SIGINT, 2);
# endif
# ifdef SIGQUIT
_allow_interrupt(ss, SIGINT, 3);
# endif
#endif
}
#ifdef HAVE_SIGACTION
static void _restore_interrupt(saved_sig_state *ss, int sig, int slot)
{
if(sigaction(sig, &ss->sa[slot], NULL) < 0) {
perror("restore sigaction");
exit(1);
}
}
#endif
/* Restore syscalls to be interrupted by signal */
void restore_interrupts(saved_sig_state *ss)
{
#ifdef HAVE_SIGACTION
# ifdef SIGHUP
_restore_interrupt(ss, SIGINT, 0);
# endif
# ifdef SIGINT
_restore_interrupt(ss, SIGINT, 1);
# endif
# ifdef SIGTERM
_restore_interrupt(ss, SIGINT, 2);
# endif
# ifdef SIGQUIT
_restore_interrupt(ss, SIGINT, 3);
# endif
#endif
}
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