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![NIIBE Yutaka](/assets/img/avatar_default.png)
* common/signal.c (get_signal_name): Use sigdescr_np if available. * configure.ac: Check the function. -- GnuPG-bug-id: 5568 Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
252 lines
5.9 KiB
C
252 lines
5.9 KiB
C
/* signal.c - signal handling
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* Copyright (C) 1998, 1999, 2000, 2001, 2002,
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* 2005 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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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file 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, see <https://www.gnu.org/licenses/>.
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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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#ifdef HAVE_SIGNAL_H
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# include <signal.h>
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#endif
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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 "util.h"
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#ifndef HAVE_DOSISH_SYSTEM
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static volatile int caught_fatal_sig;
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static volatile int caught_sigusr1;
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#endif
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static void (*cleanup_fnc)(void);
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#ifndef HAVE_DOSISH_SYSTEM
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static void
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init_one_signal (int sig, void (*handler)(int), int check_ign )
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{
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# ifdef HAVE_SIGACTION
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struct sigaction oact, nact;
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if (check_ign)
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{
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/* we don't want to change an IGN handler */
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sigaction (sig, NULL, &oact );
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if (oact.sa_handler == SIG_IGN )
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return;
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}
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nact.sa_handler = handler;
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sigemptyset (&nact.sa_mask);
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nact.sa_flags = 0;
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sigaction ( sig, &nact, NULL);
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# else
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void (*ohandler)(int);
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ohandler = signal (sig, handler);
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if (check_ign && ohandler == SIG_IGN)
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{
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/* Change it back if it was already set to IGN */
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signal (sig, SIG_IGN);
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}
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# endif
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}
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#endif /*!HAVE_DOSISH_SYSTEM*/
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#ifndef HAVE_DOSISH_SYSTEM
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static const char *
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get_signal_name( int signum )
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{
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/* Note that we can't use strsignal(), because it is not
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reentrant. */
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#if HAVE_SIGDESCR_NP
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return sigdescr_np (signum);
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#elif HAVE_DECL_SYS_SIGLIST && defined(NSIG)
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return (signum >= 0 && signum < NSIG) ? sys_siglist[signum] : "?";
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#else
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return NULL;
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#endif
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}
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#endif /*!HAVE_DOSISH_SYSTEM*/
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#ifndef HAVE_DOSISH_SYSTEM
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static void
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got_fatal_signal (int sig)
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{
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const char *s;
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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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if (cleanup_fnc)
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cleanup_fnc ();
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/* Better don't translate these messages. */
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(void)write (2, "\n", 1 );
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s = log_get_prefix (NULL);
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if (s)
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(void)write(2, s, strlen (s));
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(void)write (2, ": signal ", 9 );
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s = get_signal_name(sig);
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if (s)
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(void) write (2, s, strlen(s) );
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else
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{
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/* We are in a signal handler so we can't use any kind of printf
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even not sprintf. So we use a straightforward algorithm. We
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got a report that on one particular system, raising a signal
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while in this handler, the parameter SIG get sclobbered and
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things are messed up because we modify its value. Although
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this is a bug in that system, we will protect against it. */
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if (sig < 0 || sig >= 100000)
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(void)write (2, "?", 1);
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else
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{
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int i, value, any=0;
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for (value=sig,i=10000; i; i /= 10)
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{
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if (value >= i || ((any || i==1) && !(value/i)))
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{
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(void)write (2, &"0123456789"[value/i], 1);
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if ((value/i))
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any = 1;
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value %= i;
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}
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}
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}
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}
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(void)write (2, " caught ... exiting\n", 20);
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/* Reset action to default action and raise signal again */
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init_one_signal (sig, SIG_DFL, 0);
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/* Fixme: remove_lockfiles ();*/
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#ifdef __riscos__
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close_fds ();
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#endif /* __riscos__ */
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raise( sig );
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}
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#endif /*!HAVE_DOSISH_SYSTEM*/
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#ifndef HAVE_DOSISH_SYSTEM
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static void
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got_usr_signal (int sig)
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{
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(void)sig;
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caught_sigusr1 = 1;
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}
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#endif /*!HAVE_DOSISH_SYSTEM*/
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void
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gnupg_init_signals (int mode, void (*fast_cleanup)(void))
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{
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assert (!mode);
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cleanup_fnc = fast_cleanup;
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#ifndef HAVE_DOSISH_SYSTEM
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init_one_signal (SIGINT, got_fatal_signal, 1 );
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init_one_signal (SIGHUP, got_fatal_signal, 1 );
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init_one_signal (SIGTERM, got_fatal_signal, 1 );
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init_one_signal (SIGQUIT, got_fatal_signal, 1 );
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init_one_signal (SIGSEGV, got_fatal_signal, 1 );
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init_one_signal (SIGUSR1, got_usr_signal, 0 );
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init_one_signal (SIGPIPE, SIG_IGN, 0 );
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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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#ifdef HAVE_DOSISH_SYSTEM
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(void)block;
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#else /*!HAVE_DOSISH_SYSTEM*/
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static int is_blocked;
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#ifdef HAVE_SIGPROCMASK
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static sigset_t oldmask;
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if (block)
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{
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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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{
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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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#else /*!HAVE_SIGPROCMASK*/
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static void (*disposition[MAXSIG])();
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int sig;
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if (block)
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{
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if (is_blocked)
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log_bug("signals are already blocked\n");
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for (sig=1; sig < MAXSIG; sig++)
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{
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disposition[sig] = sigset (sig, SIG_HOLD);
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}
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is_blocked = 1;
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}
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else
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{
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if (!is_blocked)
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log_bug ("signals are not blocked\n");
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for (sig=1; sig < MAXSIG; sig++) {
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sigset (sig, disposition[sig]);
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}
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is_blocked = 0;
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}
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#endif /*!HAVE_SIGPROCMASK*/
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#endif /*!HAVE_DOSISH_SYSTEM*/
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}
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void
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gnupg_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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gnupg_unblock_all_signals ()
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{
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do_block(0);
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}
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