This commit was manufactured by cvs2svn to create branch

'GNUPG-1-9-BRANCH'.

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);
+}