supervise-daemon: multiple fixes

- Harden against dying by handling all signals that would terminate the
program and adding --reexec support
- factor the supervisor into its own function
- fix test for whether we are already running

1 files changed, 12 insertions, 0 deletions

diff --git a/src/rc/rc-misc.c b/src/rc/rc-misc.c
index d43f1274..33a17b35 100644
--- a/src/rc/rc-misc.c
+++ b/src/rc/rc-misc.c
@@ -218,6 +218,18 @@ signal_setup(int sig, void (*handler)(int))
 }
 
 int
+signal_setup_restart(int sig, void (*handler)(int))
+{
+	struct sigaction sa;
+
+	memset(&sa, 0, sizeof (sa));
+	sigemptyset(&sa.sa_mask);
+	sa.sa_handler = handler;
+	sa.sa_flags = SA_RESTART;
+	return sigaction(sig, &sa, NULL);
+}
+
+int
 svc_lock(const char *applet)
 {
 	char file[PATH_MAX];