Use sigaction over signal.

src/includes/rc-misc.h

@@ -34,6 +34,7 @@
 
 #include <sys/stat.h>
 #include <errno.h>
+#include <signal.h>
 #include <stdbool.h>
 #include <string.h>
 
@@ -133,6 +134,7 @@ bool rc_conf_yesno (const char *var);
 char **env_filter (void);
 char **env_config (void);
 bool service_plugable (const char *service);
+void signal_setup (int sig, void (*handler)(int));
 
 /* basename_c never modifies the argument. As such, if there is a trailing
  * slash then an empty string is returned. */

src/rc/rc-misc.c

@@ -39,10 +39,12 @@
 #include <sys/utsname.h>
 #include <ctype.h>
 #include <limits.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+#include "einfo.h"
 #include "rc.h"
 #include "rc-misc.h"
 #include "strlist.h"
@@ -429,3 +431,14 @@ bool service_plugable (const char *service)
 	free (list);
 	return (allow);
 }
+
+void signal_setup (int sig, void (*handler)(int))
+{
+	struct sigaction sa;
+
+	memset (&sa, 0, sizeof (sa));
+	sa.sa_handler = handler;
+	sigemptyset (&sa.sa_mask);
+	if (sigaction (sig, &sa, NULL) == -1)
+		eerrorx ("sigaction: %s", strerror (errno));
+}

src/rc/rc.c

@@ -441,6 +441,7 @@ static void handle_signal (int sig)
 	pid_t pid;
 	int status = 0;
 	struct winsize ws;
+	sigset_t sset;
 
 	switch (sig) {
 		case SIGCHLD:
@@ -480,9 +481,13 @@ static void handle_signal (int sig)
 			/* NOTREACHED */
 		case SIGUSR1:
 			eerror ("rc: Aborting!");
-			/* Kill any running services we have started */
 
-			signal (SIGCHLD, SIG_IGN);
+			/* Block child signals */
+			sigemptyset (&sset);
+			sigaddset (&sset, SIGCHLD);
+			sigprocmask (SIG_BLOCK, &sset, NULL);
+
+			/* Kill any running services we have started */
 			for (pl = service_pids; pl; pl = pl->next)
 				kill (pl->pid, SIGTERM);
 
@@ -761,12 +766,12 @@ int main (int argc, char **argv)
 	rc_logger_open (newlevel ? newlevel : runlevel);
 
 	/* Setup a signal handler */
-	signal (SIGINT, handle_signal);
-	signal (SIGQUIT, handle_signal);
-	signal (SIGTERM, handle_signal);
-	signal (SIGUSR1, handle_signal);
-	signal (SIGWINCH, handle_signal);
-
+	signal_setup (SIGINT, handle_signal);
+	signal_setup (SIGQUIT, handle_signal);
+	signal_setup (SIGTERM, handle_signal);
+	signal_setup (SIGUSR1, handle_signal);
+	signal_setup (SIGWINCH, handle_signal);
+	
 	if (! rc_yesno (getenv ("EINFO_QUIET")))
 		interactive = exists (INTERACTIVE);
 	rc_plugin_load ();
@@ -871,7 +876,7 @@ int main (int argc, char **argv)
 	}
 
 	/* Now we start handling our children */
-	signal (SIGCHLD, handle_signal);
+	signal_setup (SIGCHLD, handle_signal);
 
 	/* We should only use ksoftlevel if we were in single user mode
 	 * If not, we need to erase ksoftlevel now. */

src/rc/runscript.c

@@ -490,7 +490,8 @@ static bool svc_exec (const char *arg1, const char *arg2)
 	signal_pipe[0] = signal_pipe[1] = -1;
 
 	if (master_tty >= 0) {
-		signal (SIGWINCH, SIG_IGN);
+		/* Why did we do this? */
+		/* signal (SIGWINCH, SIG_IGN); */
 		close (master_tty);
 		master_tty = -1;
 	}
@@ -1199,11 +1200,11 @@ int runscript (int argc, char **argv)
 	}
 
 	/* Setup a signal handler */
-	signal (SIGHUP, handle_signal);
-	signal (SIGINT, handle_signal);
-	signal (SIGQUIT, handle_signal);
-	signal (SIGTERM, handle_signal);
-	signal (SIGCHLD, handle_signal);
+	signal_setup (SIGHUP, handle_signal);
+	signal_setup (SIGINT, handle_signal);
+	signal_setup (SIGQUIT, handle_signal);
+	signal_setup (SIGTERM, handle_signal);
+	signal_setup (SIGCHLD, handle_signal);
 
 	/* Load our plugins */
 	rc_plugin_load ();

src/rc/start-stop-daemon.c

@@ -578,9 +578,9 @@ int start_stop_daemon (int argc, char **argv)
 	applet = basename_c (argv[0]);
 	atexit (cleanup);
 
-	signal (SIGINT, handle_signal);
-	signal (SIGQUIT, handle_signal);
-	signal (SIGTERM, handle_signal);
+	signal_setup (SIGINT, handle_signal);
+	signal_setup (SIGQUIT, handle_signal);
+	signal_setup (SIGTERM, handle_signal);
 
 	if ((env = getenv ("SSD_NICELEVEL")))
 		if (sscanf (env, "%d", &nicelevel) != 1)
@@ -823,7 +823,7 @@ int start_stop_daemon (int argc, char **argv)
 	}
 
 	if (background)
-		signal (SIGCHLD, handle_signal);
+		signal_setup (SIGCHLD, handle_signal);
 
 	*--argv = exec;
 	if ((pid = fork ()) == -1)