halt/reboot/poweroff: add a CONFIG_xxx to act SysV compatibly

Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/init/Config.in b/init/Config.in
index 1a1be4a..3d99d47 100644 (file)
--- a/init/Config.in
+++ b/init/Config.in
@@ -93,6 +93,26 @@ config HALT
        help
          Stop all processes and either halt, reboot, or power off the system.
 
+config FEATURE_CALL_TELINIT
+       bool "Call telinit on shutdown and reboot"
+       default n
+       depends on HALT && !INIT
+       help
+         Call an external program (normally telinit) to facilitate
+         a switch to a proper runlevel.
+
+         This option is only available if you selected halt and friends,
+         but did not select init.
+
+config TELINIT_PATH
+       string "Path to telinit executable"
+       default "/sbin/telinit"
+       depends on FEATURE_CALL_TELINIT
+       help
+         When busybox halt and friends have to call external telinit
+         to facilitate proper shutdown, this path is to be used when
+         locating telinit executable.
+
 config MESG
        bool "mesg"
        default n

diff --git a/init/halt.c b/init/halt.c
index 3a23eca..c88c333 100644 (file)
--- a/init/halt.c
+++ b/init/halt.c
@@ -85,6 +85,8 @@ int halt_main(int argc UNUSED_PARAM, char **argv)
 //TODO: I tend to think that signalling linuxrc is wrong
 // pity original author didn't comment on it...
                if (ENABLE_FEATURE_INITRD) {
+                       /* talk to linuxrc */
+                       /* bbox init/linuxrc assumed */
                        pid_t *pidlist = find_pid_by_name("linuxrc");
                        if (pidlist[0] > 0)
                                rc = kill(pidlist[0], signals[which]);
@@ -92,7 +94,21 @@ int halt_main(int argc UNUSED_PARAM, char **argv)
                                free(pidlist);
                }
                if (rc) {
-                       rc = kill(1, signals[which]);
+                       /* talk to init */
+                       if (!ENABLE_FEATURE_CALL_TELINIT) {
+                               /* bbox init assumed */
+                               rc = kill(1, signals[which]);
+                       } else {
+                               /* SysV style init assumed */
+                               /* runlevels:
+                                * 0 == shutdown
+                                * 6 == reboot */
+                               rc = execlp(CONFIG_TELINIT_PATH,
+                                               CONFIG_TELINIT_PATH,
+                                               which == 2 ? "6" : "0",
+                                               (char *)NULL
+                               );
+                       }
                }
        } else {
                rc = reboot(magic[which]);