X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=gui.c;h=b0eae64ae129999083263846d60a9bfd939aae2e;hp=a2d4b5f6c7611914b566128f509bea80caf6fe76;hb=5e8d8a8eea6de9459ebdf4498f9f061c84bfa63a;hpb=be46d3b63c855fe63ecc6feb7c4a2d3edab92307

diff --git a/gui.c b/gui.c
index a2d4b5f6..b0eae64a 100644
--- a/gui.c
+++ b/gui.c
@@ -146,7 +146,7 @@ struct exec_task {
 	unsigned flags[2]; /* passed to for_each_line() */
 };
 
-static int find_cmd_byname(char *name)
+static int find_cmd_byname(const char *name)
 {
 	int i;
 
@@ -498,9 +498,18 @@ static __printf_2_3 void curses_log(int ll, const char *fmt,...)
 /** The log function of para_gui, always set to curses_log(). */
 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 
+/* Call endwin() to reset the terminal into non-visual mode. */
 static void shutdown_curses(void)
 {
-	def_prog_mode();
+	/*
+	 * If para_gui received a terminating signal in external mode, the
+	 * terminal can be in an unusable state at this point because the child
+	 * process might not have caught the signal. In this case endwin() has
+	 * already been called and must not be called again. So we first return
+	 * to program mode, then call endwin().
+	 */
+	if (!curses_active())
+		reset_prog_mode();
 	endwin();
 }
 
@@ -509,6 +518,14 @@ __noreturn __printf_2_3 static void die(int exit_code, const char* fmt, ...)
 {
 	va_list argp;
 
+	/* Kill every process in our process group. */
+	para_sigaction(SIGTERM, SIG_IGN);
+	kill(0, SIGTERM);
+	/* Wait up to two seconds for child processes to die. */
+	alarm(2);
+	while (waitpid(0, NULL, 0) >= 0)
+		; /* nothing */
+	alarm(0);
 	/* mousemask() exists only in ncurses */
 #ifdef NCURSES_MOUSE_VERSION
 	mousemask(~(mmask_t)0, NULL); /* Avoid bad terminal state with xterm. */
@@ -517,9 +534,6 @@ __noreturn __printf_2_3 static void die(int exit_code, const char* fmt, ...)
 	va_start(argp, fmt);
 	vfprintf(stderr, fmt, argp);
 	va_end(argp);
-	/* kill every process in the process group and exit */
-	para_sigaction(SIGTERM, SIG_IGN);
-	kill(0, SIGTERM);
 	exit(exit_code);
 }
 
@@ -921,12 +935,7 @@ static int signal_post_select(struct sched *s, __a_unused void *context)
 	switch (ret) {
 	case SIGTERM:
 		die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
-		return 1;
 	case SIGINT:
-		PARA_WARNING_LOG("caught SIGINT, reset\n");
-		/* Nothing to do. SIGINT killed our child which gets noticed
-		 * by do_select and resets everything.
-		 */
 		return 1;
 	case SIGUSR1:
 		PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
@@ -1482,9 +1491,9 @@ static int setup_tasks_and_schedule(void)
  * The exec task is responsible for printing the output of the currently
  * running executable to the bottom window.
  *
- * The signal task performs suitable actions according to any signals received.
- * For example it refreshes all windows on terminal size changes and resets the
- * terminal on \p SIGTERM.
+ * The signal task performs various actions according to signals received. For
+ * example, it reloads the configuration file on SIGUSR1, and it shuts down the
+ * curses system on SIGTERM to restore the terminal settings before exit.
  *
  * The input task reads single key strokes from stdin. For each key pressed, it
  * executes the command handler associated with this key.