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Repo Admin 2002-10-19 07:55:27 +00:00
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g10/signal.c
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/* signal.c - signal handling
* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 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"
static volatile int caught_fatal_sig = 0;
static volatile int caught_sigusr1 = 0;
static void
init_one_signal (int sig, RETSIGTYPE (*handler)(int), int check_ign )
{
#ifndef HAVE_DOSISH_SYSTEM
#ifdef HAVE_SIGACTION
struct sigaction oact, nact;
if (check_ign) {
/* we don't want to change an IGN handler */
sigaction (sig, NULL, &oact );
if (oact.sa_handler == SIG_IGN )
return;
}
nact.sa_handler = handler;
sigemptyset (&nact.sa_mask);
nact.sa_flags = 0;
sigaction ( sig, &nact, NULL);
#else
RETSIGTYPE (*ohandler)(int);
ohandler = signal (sig, handler);
if (check_ign && ohandler == SIG_IGN) {
/* Change it back if it was already set to IGN */
signal (sig, SIG_IGN);
}
#endif
#endif /*!HAVE_DOSISH_SYSTEM*/
}
static const char *
get_signal_name( int signum )
{
#if defined(SYS_SIGLIST_DECLARED) && defined(NSIG)
return (signum >= 0 && signum < NSIG) ? sys_siglist[signum] : "?";
#else
return "some signal";
#endif
}
static RETSIGTYPE
got_fatal_signal( int sig )
{
const char *s;
if( caught_fatal_sig )
raise( sig );
caught_fatal_sig = 1;
secmem_term();
/* better don't transtale these messages */
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", 20 );
/* reset action to default action and raise signal again */
init_one_signal (sig, SIG_DFL, 0);
remove_lockfiles ();
#ifdef __riscos__
close_fds ();
#endif /* __riscos__ */
raise( sig );
}
static RETSIGTYPE
got_usr_signal( int sig )
{
caught_sigusr1 = 1;
}
void
init_signals()
{
#ifndef HAVE_DOSISH_SYSTEM
init_one_signal (SIGINT, got_fatal_signal, 1 );
init_one_signal (SIGHUP, got_fatal_signal, 1 );
init_one_signal (SIGTERM, got_fatal_signal, 1 );
init_one_signal (SIGQUIT, got_fatal_signal, 1 );
init_one_signal (SIGSEGV, got_fatal_signal, 1 );
init_one_signal (SIGUSR1, got_usr_signal, 0 );
init_one_signal (SIGPIPE, SIG_IGN, 0 );
#endif
}
void
pause_on_sigusr( int which )
{
#ifndef HAVE_DOSISH_SYSTEM
#ifdef HAVE_SIGPROCMASK
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 );
#else
assert (which == 1);
sighold (SIGUSR1);
while (!caught_sigusr1)
sigpause(SIGUSR1);
caught_sigusr1 = 0;
sigrelse(SIGUSR1); ????
#endif /*!HAVE_SIGPROCMASK*/
#endif
}
static void
do_block( int block )
{
#ifndef HAVE_DOSISH_SYSTEM
static int is_blocked;
#ifdef HAVE_SIGPROCMASK
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;
}
#else /*!HAVE_SIGPROCMASK*/
static void (*disposition[MAXSIG])();
int sig;
if( block ) {
if( is_blocked )
log_bug("signals are already blocked\n");
for (sig=1; sig < MAXSIG; sig++) {
disposition[sig] = sigset (sig, SIG_HOLD);
}
is_blocked = 1;
}
else {
if( !is_blocked )
log_bug("signals are not blocked\n");
for (sig=1; sig < MAXSIG; sig++) {
sigset (sig, disposition[sig]);
}
is_blocked = 0;
}
#endif /*!HAVE_SIGPROCMASK*/
#endif /*HAVE_DOSISH_SYSTEM*/
}
void
block_all_signals()
{
do_block(1);
}
void
unblock_all_signals()
{
do_block(0);
}