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mirror of git://git.gnupg.org/gnupg.git synced 2024-12-24 10:39:57 +01:00
gnupg/g10/signal.c
Werner Koch b008274afd Nuked almost all trailing white space.
We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces.  In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much.  For future commits the pre-commit scripts
checks that this won't happen again.
2011-02-04 12:57:53 +01:00

205 lines
4.8 KiB
C

/* signal.c - signal handling
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
* 2005 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#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 "gpg.h"
#include "options.h"
#include "status.h"
#include "util.h"
#include "main.h"
#include "ttyio.h"
#ifdef HAVE_DOSISH_SYSTEM
void init_signals(void) {}
#else
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 )
{
#if defined(HAVE_SIGACTION) && defined(HAVE_STRUCT_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
}
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 );
tty_cleanup_rl_after_signal ();
tty_cleanup_after_signal ();
/* Better don't translate these messages. */
write(2, "\n", 1 );
s = log_get_name(); if( s ) write(2, s, strlen(s) );
write(2, ": ", 2 );
#if HAVE_DECL_SYS_SIGLIST && defined(NSIG)
s = (sig >= 0 && sig < NSIG) ? sys_siglist[sig] : "?";
write (2, s, strlen(s) );
#else
write (2, "signal ", 7 );
if (sig < 0 || sig >=100)
write (2, "?", 1);
else {
if (sig >= 10)
write (2, "0123456789"+(sig/10), 1 );
write (2, "0123456789"+(sig%10), 1 );
}
#endif
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()
{
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 );
}
/* Disabled - see comment in tdbio.c:tdbio_begin_transaction() */
#if 0
static void
do_block( int block )
{
static int is_blocked;
#if defined(HAVE_SIGPROCMASK) && defined(HAVE_SIGSET_T)
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 && HAVE_SIGSET_T */
#if defined(NSIG)
#define SIGSMAX (NSIG)
#elif defined(MAXSIG)
#define SIGSMAX (MAXSIG+1)
#else
#error "define SIGSMAX to the number of signals on your platform plus one"
#endif
static void (*disposition[SIGSMAX])(int);
int sig;
if( block ) {
if( is_blocked )
log_bug("signals are already blocked\n");
for (sig=1; sig < SIGSMAX; 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 < SIGSMAX; sig++) {
sigset (sig, disposition[sig]);
}
is_blocked = 0;
}
#endif /*! HAVE_SIGPROCMASK && HAVE_SIGSET_T */
}
void
block_all_signals()
{
do_block(1);
}
void
unblock_all_signals()
{
do_block(0);
}
#endif
#endif /* !HAVE_DOSISH_SYSTEM */