135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
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/* Copyright 1996,1997,2001,2002,2007,2009 Alain Knaff.
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* This file is part of mtools.
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*
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* Mtools is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mtools is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sysincludes.h"
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#include "mtools.h"
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#undef got_signal
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int got_signal = 0;
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static void signal_handler(int dummy UNUSEDP)
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{
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got_signal = 1;
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#if 0
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signal(SIGHUP, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGTERM, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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#endif
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}
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#if 0
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int do_gotsignal(char *f, int n)
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{
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if(got_signal)
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fprintf(stderr, "file=%s line=%d\n", f, n);
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return got_signal;
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}
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#endif
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void setup_signal(void)
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{
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/* catch signals */
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#ifdef SIGHUP
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signal(SIGHUP, signal_handler);
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#endif
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#ifdef SIGINT
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signal(SIGINT, signal_handler);
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#endif
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#ifdef SIGTERM
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signal(SIGTERM, signal_handler);
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#endif
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#ifdef SIGQUIT
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signal(SIGQUIT, signal_handler);
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#endif
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}
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#ifdef HAVE_SIGACTION
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static void _allow_interrupt(saved_sig_state *ss, int sig, int slot)
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{
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struct sigaction new;
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bzero(&new, sizeof(new));
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new.sa_handler = signal_handler;
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new.sa_flags &= ~SA_RESTART;
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if(sigaction(sig, &new, &ss->sa[slot]) < 0) {
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perror("sigaction");
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exit(1);
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}
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}
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#endif
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/* Allow syscalls to be interrupted by signal */
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void allow_interrupts(saved_sig_state *ss)
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{
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#ifdef HAVE_SIGACTION
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# ifdef SIGHUP
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_allow_interrupt(ss, SIGINT, 0);
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# endif
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# ifdef SIGINT
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_allow_interrupt(ss, SIGINT, 1);
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# endif
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# ifdef SIGTERM
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_allow_interrupt(ss, SIGINT, 2);
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# endif
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# ifdef SIGQUIT
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_allow_interrupt(ss, SIGINT, 3);
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# endif
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#endif
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}
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#ifdef HAVE_SIGACTION
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static void _restore_interrupt(saved_sig_state *ss, int sig, int slot)
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{
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if(sigaction(sig, &ss->sa[slot], NULL) < 0) {
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perror("restore sigaction");
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exit(1);
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}
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}
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#endif
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/* Restore syscalls to be interrupted by signal */
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void restore_interrupts(saved_sig_state *ss)
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{
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#ifdef HAVE_SIGACTION
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# ifdef SIGHUP
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_restore_interrupt(ss, SIGINT, 0);
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# endif
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# ifdef SIGINT
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_restore_interrupt(ss, SIGINT, 1);
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# endif
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# ifdef SIGTERM
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_restore_interrupt(ss, SIGINT, 2);
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# endif
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# ifdef SIGQUIT
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_restore_interrupt(ss, SIGINT, 3);
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# endif
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#endif
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}
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