Add in a new restart init target, triggered by SIGHUP. Patch from
Russ Dill, with adjustments by me.
-Erik
diff --git a/init/init.c b/init/init.c
index d0beb2a..f6108f1 100644
--- a/init/init.c
+++ b/init/init.c
@@ -142,7 +142,8 @@
WAIT,
ONCE,
CTRLALTDEL,
- SHUTDOWN
+ SHUTDOWN,
+ RESTART
} initActionEnum;
/* A mapping between "inittab" action name strings and action type codes. */
@@ -159,6 +160,7 @@
{"once", ONCE},
{"ctrlaltdel", CTRLALTDEL},
{"shutdown", SHUTDOWN},
+ {"restart", RESTART},
{0, 0}
};
@@ -688,6 +690,26 @@
}
}
+static void exec_signal(int sig)
+{
+ initAction *a, *tmp;
+ for (a = initActionList; a; a = tmp) {
+ tmp = a->nextPtr;
+ if (a->action == RESTART) {
+ shutdown_system();
+ message(CONSOLE|LOG, "Trying to re-exec %s\n", a->process);
+ execl(a->process, a->process, NULL);
+
+ message(CONSOLE|LOG, "execl of %s failed: %s\n",
+ a->process, sys_errlist[errno]);
+ sync();
+ sleep(2);
+ init_reboot(RB_HALT_SYSTEM);
+ loop_forever();
+ }
+ }
+}
+
static void halt_signal(int sig)
{
shutdown_system();
@@ -839,6 +861,8 @@
/* Swapoff on halt/reboot */
new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
#endif
+ /* Prepare to restart init when a HUP is received */
+ new_initAction(RESTART, "/sbin/init", console);
/* Askfirst shell on tty1 */
new_initAction(ASKFIRST, LOGIN_SHELL, console);
/* Askfirst shell on tty2 */
@@ -937,6 +961,12 @@
pid_t wpid;
int status;
+
+ if (argc > 1 && !strcmp(argv[1], "-q")) {
+ kill(1, SIGHUP);
+ exit(0);
+ }
+
#ifndef DEBUG_INIT
/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
if (getpid() != 1
@@ -949,6 +979,7 @@
}
/* Set up sig handlers -- be sure to
* clear all of these in run() */
+ signal(SIGHUP, exec_signal);
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, halt_signal);
signal(SIGINT, ctrlaltdel_signal);