medfall

commit 58e90c9730426b75d43c8a0ee38676cb16cb7556
parent 29d41209fc6572caf19a53665e7387584723bc25
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Fri Oct 21 17:42:26 +0300

Bell in autogdb and allow gdb to continue from SIGINT/SIGTRAP

Diffstat:
autogdb.h
 | 
21
+++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/autogdb.h b/autogdb.h
@@ -17,24 +17,34 @@ static void pause_forever( int signal ) {
 }
 
 static void uninstall_debug_signal_handlers() {
-	signal( SIGINT, SIG_DFL );
+	signal( SIGINT, SIG_IGN );
 	signal( SIGILL, pause_forever );
+	signal( SIGTRAP, SIG_IGN );
 	signal( SIGABRT, pause_forever );
 	signal( SIGSEGV, pause_forever );
 }
 
+static void reset_debug_signal_handlers() {
+	signal( SIGINT, SIG_DFL );
+	signal( SIGILL, SIG_DFL );
+	signal( SIGTRAP, SIG_DFL );
+	signal( SIGABRT, SIG_DFL );
+	signal( SIGSEGV, SIG_DFL );
+}
+
 static void prompt_to_run_gdb( int signal ) {
 	uninstall_debug_signal_handlers();
 
 	const char * signal_names[ NSIG ];
 	signal_names[ SIGINT ] = "SIGINT";
 	signal_names[ SIGILL ] = "SIGILL";
+	signal_names[ SIGTRAP ] = "SIGTRAP";
 	signal_names[ SIGABRT ] = "SIGABRT";
 	signal_names[ SIGSEGV ] = "SIGSEGV";
 
 	char crashed_pid[ 16 ];
 	snprintf( crashed_pid, sizeof( crashed_pid ), "%d", getpid() );
-	printf( "PID %s received %s. Debug? (y/n)\n", crashed_pid, signal_names[ signal ] );
+	printf( "\nPID %s received %s. Debug? (y/n)\n", crashed_pid, signal_names[ signal ] );
 
 	char buf[ 2 ];
 	read( STDIN_FILENO, &buf, sizeof( buf ) );
@@ -47,6 +57,7 @@ static void prompt_to_run_gdb( int signal ) {
 	if( child_pid == -1 ) {
 		err( 1, "fork" );
 	}
+	reset_debug_signal_handlers();
 
 	if( child_pid == 0 ) {
 		execlp( "gdbx", "gdbx", "--", "-q", "-p", crashed_pid, ( char * ) 0 );
@@ -54,8 +65,10 @@ static void prompt_to_run_gdb( int signal ) {
 		err( 1, "execlp" );
 	}
 
-	waitpid( child_pid, NULL, 0 );
-	exit( 1 );
+	if( signal != SIGINT && signal != SIGTRAP ) {
+		waitpid( child_pid, NULL, 0 );
+		exit( 1 );
+	}
 }
 
 static void install_debug_signal_handlers( bool debug_on_sigint ) {