init: halt on SIGPWR too
Most init processes implement a handler for SIGPWR that gracefully
stops all child processes when shutting down a machine. Some other
technologies rely on this signal - e.g. Busybox powered LXC
containers.
This patch makes busybox init halt when receiving SIGPWR.
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/init/init.c b/init/init.c
index c63bba1..d29328c 100644
--- a/init/init.c
+++ b/init/init.c
@@ -789,7 +789,7 @@
* and only one will be remembered and acted upon.
*/
-/* The SIGUSR[12]/SIGTERM handler */
+/* The SIGPWR/SIGUSR[12]/SIGTERM handler */
static void halt_reboot_pwoff(int sig) NORETURN;
static void halt_reboot_pwoff(int sig)
{
@@ -1103,8 +1103,8 @@
/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
* then parse_inittab() simply adds in some default
- * actions(i.e., INIT_SCRIPT and a pair
- * of "askfirst" shells */
+ * actions (i.e., INIT_SCRIPT and a pair
+ * of "askfirst" shells) */
parse_inittab();
}
@@ -1135,6 +1135,7 @@
struct sigaction sa;
bb_signals(0
+ + (1 << SIGPWR) /* halt */
+ (1 << SIGUSR1) /* halt */
+ (1 << SIGTERM) /* reboot */
+ (1 << SIGUSR2) /* poweroff */