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Diffstat (limited to 'signal.c')
-rw-r--r-- | signal.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/signal.c b/signal.c new file mode 100644 index 0000000..c8533a7 --- /dev/null +++ b/signal.c @@ -0,0 +1,134 @@ +/* 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) +{ + 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 +} |