1998-03-19 15:27:29 +00:00
|
|
|
/* signal.c - signal handling
|
2000-05-12 11:59:49 +00:00
|
|
|
* Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
|
1998-03-19 15:27:29 +00:00
|
|
|
*
|
1998-12-23 12:41:40 +00:00
|
|
|
* This file is part of GnuPG.
|
1998-03-19 15:27:29 +00:00
|
|
|
*
|
1998-12-23 12:41:40 +00:00
|
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
1998-03-19 15:27:29 +00:00
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
1998-12-23 12:41:40 +00:00
|
|
|
* GnuPG is distributed in the hope that it will be useful,
|
1998-03-19 15:27:29 +00:00
|
|
|
* 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 this program; if not, write to the Free Software
|
|
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <signal.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <assert.h>
|
|
|
|
|
|
|
|
#include "options.h"
|
|
|
|
#include "errors.h"
|
|
|
|
#include "memory.h"
|
|
|
|
#include "util.h"
|
|
|
|
#include "main.h"
|
|
|
|
#include "ttyio.h"
|
|
|
|
|
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
static volatile int caught_fatal_sig = 0;
|
|
|
|
static volatile int caught_sigusr1 = 0;
|
1998-03-19 15:27:29 +00:00
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
static const char *
|
1999-09-13 08:56:45 +00:00
|
|
|
get_signal_name( int signum )
|
1998-07-31 16:45:58 +00:00
|
|
|
{
|
1999-08-30 18:48:57 +00:00
|
|
|
#if defined(SYS_SIGLIST_DECLARED) && defined(NSIG)
|
|
|
|
return (signum >= 0 && signum < NSIG) ? sys_siglist[signum] : "?";
|
1998-03-19 15:27:29 +00:00
|
|
|
#else
|
1999-09-13 08:56:45 +00:00
|
|
|
return "some signal";
|
1998-03-19 15:27:29 +00:00
|
|
|
#endif
|
1998-07-31 16:45:58 +00:00
|
|
|
}
|
|
|
|
|
1999-09-13 08:56:45 +00:00
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
static RETSIGTYPE
|
|
|
|
got_fatal_signal( int sig )
|
|
|
|
{
|
1999-09-13 08:56:45 +00:00
|
|
|
const char *s;
|
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
if( caught_fatal_sig )
|
|
|
|
raise( sig );
|
|
|
|
caught_fatal_sig = 1;
|
|
|
|
|
1998-03-19 15:27:29 +00:00
|
|
|
secmem_term();
|
1999-11-22 10:10:27 +00:00
|
|
|
/* better don't transtale these messages */
|
1999-09-13 08:56:45 +00:00
|
|
|
write(2, "\n", 1 );
|
|
|
|
s = log_get_name(); if( s ) write(2, s, strlen(s) );
|
|
|
|
write(2, ": ", 2 );
|
|
|
|
s = get_signal_name(sig); write(2, s, strlen(s) );
|
|
|
|
write(2, " caught ... exiting\n", 21 );
|
1999-11-22 10:10:27 +00:00
|
|
|
|
1999-12-19 14:23:19 +00:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
|
|
|
{ /* reset action to default action and raise signal again */
|
|
|
|
struct sigaction nact;
|
|
|
|
nact.sa_handler = SIG_DFL;
|
|
|
|
sigemptyset( &nact.sa_mask );
|
|
|
|
nact.sa_flags = 0;
|
|
|
|
sigaction( sig, &nact, NULL);
|
|
|
|
}
|
|
|
|
#endif
|
2000-12-28 15:49:42 +00:00
|
|
|
|
|
|
|
remove_lockfiles ();
|
|
|
|
|
1999-11-22 10:10:27 +00:00
|
|
|
raise( sig );
|
1998-07-31 16:45:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static RETSIGTYPE
|
|
|
|
got_usr_signal( int sig )
|
|
|
|
{
|
|
|
|
caught_sigusr1 = 1;
|
|
|
|
}
|
|
|
|
|
1999-02-10 16:22:40 +00:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
1998-07-31 16:45:58 +00:00
|
|
|
static void
|
|
|
|
do_sigaction( int sig, struct sigaction *nact )
|
|
|
|
{
|
|
|
|
struct sigaction oact;
|
|
|
|
|
|
|
|
sigaction( sig, NULL, &oact );
|
|
|
|
if( oact.sa_handler != SIG_IGN )
|
|
|
|
sigaction( sig, nact, NULL);
|
1998-03-19 15:27:29 +00:00
|
|
|
}
|
1998-10-06 12:10:02 +00:00
|
|
|
#endif
|
1998-03-19 15:27:29 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
init_signals()
|
|
|
|
{
|
1999-02-10 16:22:40 +00:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
1998-03-19 15:27:29 +00:00
|
|
|
struct sigaction nact;
|
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
nact.sa_handler = got_fatal_signal;
|
|
|
|
sigemptyset( &nact.sa_mask );
|
1998-03-19 15:27:29 +00:00
|
|
|
nact.sa_flags = 0;
|
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
do_sigaction( SIGINT, &nact );
|
|
|
|
do_sigaction( SIGHUP, &nact );
|
|
|
|
do_sigaction( SIGTERM, &nact );
|
|
|
|
do_sigaction( SIGQUIT, &nact );
|
1998-08-05 16:51:59 +00:00
|
|
|
do_sigaction( SIGSEGV, &nact );
|
1998-07-31 16:45:58 +00:00
|
|
|
nact.sa_handler = got_usr_signal;
|
|
|
|
sigaction( SIGUSR1, &nact, NULL );
|
1999-01-19 18:37:41 +00:00
|
|
|
nact.sa_handler = SIG_IGN;
|
1999-02-10 16:22:40 +00:00
|
|
|
sigaction( SIGPIPE, &nact, NULL );
|
1998-10-06 12:10:02 +00:00
|
|
|
#endif
|
1998-03-19 15:27:29 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
1998-07-31 16:45:58 +00:00
|
|
|
void
|
|
|
|
pause_on_sigusr( int which )
|
|
|
|
{
|
1999-02-10 16:22:40 +00:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
1998-07-31 16:45:58 +00:00
|
|
|
sigset_t mask, oldmask;
|
|
|
|
|
|
|
|
assert( which == 1 );
|
|
|
|
sigemptyset( &mask );
|
|
|
|
sigaddset( &mask, SIGUSR1 );
|
|
|
|
|
|
|
|
sigprocmask( SIG_BLOCK, &mask, &oldmask );
|
|
|
|
while( !caught_sigusr1 )
|
|
|
|
sigsuspend( &oldmask );
|
|
|
|
caught_sigusr1 = 0;
|
|
|
|
sigprocmask( SIG_UNBLOCK, &mask, NULL );
|
1998-10-06 12:10:02 +00:00
|
|
|
#endif
|
1998-07-31 16:45:58 +00:00
|
|
|
}
|
|
|
|
|
1998-11-03 19:38:58 +00:00
|
|
|
|
|
|
|
static void
|
|
|
|
do_block( int block )
|
|
|
|
{
|
1999-02-10 16:22:40 +00:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
1998-11-03 19:38:58 +00:00
|
|
|
static int is_blocked;
|
|
|
|
static sigset_t oldmask;
|
|
|
|
|
|
|
|
if( block ) {
|
|
|
|
sigset_t newmask;
|
|
|
|
|
|
|
|
if( is_blocked )
|
|
|
|
log_bug("signals are already blocked\n");
|
|
|
|
sigfillset( &newmask );
|
|
|
|
sigprocmask( SIG_BLOCK, &newmask, &oldmask );
|
|
|
|
is_blocked = 1;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
if( !is_blocked )
|
|
|
|
log_bug("signals are not blocked\n");
|
|
|
|
sigprocmask( SIG_SETMASK, &oldmask, NULL );
|
|
|
|
is_blocked = 0;
|
|
|
|
}
|
1999-02-10 16:22:40 +00:00
|
|
|
#endif /*HAVE_DOSISH_SYSTEM*/
|
1998-11-03 19:38:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
block_all_signals()
|
|
|
|
{
|
|
|
|
do_block(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
unblock_all_signals()
|
|
|
|
{
|
|
|
|
do_block(0);
|
|
|
|
}
|
|
|
|
|