135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
/* 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;
|
|
|
|
bzero(&new, 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
|
|
}
|