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mirror of git://git.gnupg.org/gnupg.git synced 2024-06-16 00:29:50 +02:00
gnupg/g10/signal.c
Werner Koch c0c2c58054 Finished the bulk of changes for gnupg 1.9. This included switching
to libgcrypt functions, using shared error codes from libgpg-error,
replacing the old functions we used to have in ../util by those in
../jnlib and ../common, renaming the malloc functions and a couple of
types.  Note, that not all changes are listed below becuause they are
too similar and done at far too many places.  As of today the code
builds using the current libgcrypt from CVS but it is very unlikely
that it actually works.
2003-06-18 19:56:13 +00:00

218 lines
4.9 KiB
C

/* 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;
gcry_control (GCRYCTL_TERM_SECMEM );
/* better don't transtale these messages */
write(2, "\n", 1 );
s = "?" /* FIXME: 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);
dotlock_remove_lockfiles ();
#ifdef __riscos__
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);
}