mirror of git://git.gnupg.org/gnupg.git
165 lines
3.3 KiB
C
165 lines
3.3 KiB
C
/* signal.c - signal handling
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG 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 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "options.h"
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#include "errors.h"
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#include "memory.h"
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#include "util.h"
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#include "main.h"
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#include "ttyio.h"
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static volatile int caught_fatal_sig = 0;
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static volatile int caught_sigusr1 = 0;
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static const char *
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signal_name( int signum )
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{
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#if SYS_SIGLIST_DECLARED
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return sys_siglist[signum];
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#else
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static char buf[20];
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sprintf(buf, "signal %d", signum );
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return buf;
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#endif
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}
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static RETSIGTYPE
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got_fatal_signal( int sig )
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{
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if( caught_fatal_sig )
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raise( sig );
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caught_fatal_sig = 1;
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fprintf( stderr, "\n%s: %s caught ... exiting\n",
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log_get_name(), signal_name(sig) );
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secmem_term();
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exit( 8 );
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}
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static RETSIGTYPE
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got_usr_signal( int sig )
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{
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caught_sigusr1 = 1;
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}
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#ifndef HAVE_DOSISH_SYSTEM
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static void
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do_sigaction( int sig, struct sigaction *nact )
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{
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struct sigaction oact;
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sigaction( sig, NULL, &oact );
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if( oact.sa_handler != SIG_IGN )
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sigaction( sig, nact, NULL);
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}
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#endif
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void
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init_signals()
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{
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#ifndef HAVE_DOSISH_SYSTEM
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struct sigaction nact;
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nact.sa_handler = got_fatal_signal;
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sigemptyset( &nact.sa_mask );
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nact.sa_flags = 0;
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do_sigaction( SIGINT, &nact );
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do_sigaction( SIGHUP, &nact );
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do_sigaction( SIGTERM, &nact );
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do_sigaction( SIGQUIT, &nact );
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do_sigaction( SIGSEGV, &nact );
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nact.sa_handler = got_usr_signal;
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sigaction( SIGUSR1, &nact, NULL );
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nact.sa_handler = SIG_IGN;
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sigaction( SIGPIPE, &nact, NULL );
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#endif
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}
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void
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pause_on_sigusr( int which )
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{
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#ifndef HAVE_DOSISH_SYSTEM
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sigset_t mask, oldmask;
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assert( which == 1 );
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sigemptyset( &mask );
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sigaddset( &mask, SIGUSR1 );
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sigprocmask( SIG_BLOCK, &mask, &oldmask );
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while( !caught_sigusr1 )
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sigsuspend( &oldmask );
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caught_sigusr1 = 0;
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sigprocmask( SIG_UNBLOCK, &mask, NULL );
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#endif
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}
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static void
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do_block( int block )
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{
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#ifndef HAVE_DOSISH_SYSTEM
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static int is_blocked;
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static sigset_t oldmask;
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if( block ) {
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sigset_t newmask;
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if( is_blocked )
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log_bug("signals are already blocked\n");
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sigfillset( &newmask );
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sigprocmask( SIG_BLOCK, &newmask, &oldmask );
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is_blocked = 1;
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}
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else {
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if( !is_blocked )
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log_bug("signals are not blocked\n");
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sigprocmask( SIG_SETMASK, &oldmask, NULL );
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is_blocked = 0;
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}
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#endif /*HAVE_DOSISH_SYSTEM*/
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}
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void
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block_all_signals()
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{
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do_block(1);
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}
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void
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unblock_all_signals()
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{
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do_block(0);
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}
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