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Diffstat (limited to 'g10/signal.c')
| -rw-r--r-- | g10/signal.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/g10/signal.c b/g10/signal.c new file mode 100644 index 000000000..1028ab705 --- /dev/null +++ b/g10/signal.c @@ -0,0 +1,217 @@ +/* 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__ + 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); +} |