Support reboot, halt, and poweroff independent of busybox init.

Simplify and fixup some logic.
 -Erik


git-svn-id: svn://busybox.net/trunk/busybox@7091 69ca8d6d-28ef-0310-b511-8ec308f3f277

6 files changed, 136 insertions, 45 deletions

diff --git a/init/Config.in b/init/Config.in
index c8c6a9cd6..af7aac833 100644
--- a/init/Config.in
+++ b/init/Config.in
@@ -27,7 +27,7 @@ config CONFIG_FEATURE_INITRD
 
 config CONFIG_FEATURE_INIT_COREDUMPS
         bool "  Support dumping core for child processes (debugging only)?"
-        default y
+        default n
         depends on CONFIG_INIT
         help
           If this option is enabled and the file /.init_enable_core
@@ -43,31 +43,28 @@ config CONFIG_FEATURE_EXTRA_QUIET
           Prevent init from logging some messages to the console
           during boot.
 
-# Some apps that are meaningless without BusyBox running as init
 config CONFIG_HALT
         bool "halt"
         default y
-        depends on CONFIG_INIT
         help
-          'halt' tells the kernel to stop all processes and halt the system.
+          Stop all processes and halt the system.
 
 config CONFIG_POWEROFF
         bool "poweroff"
         default y
-        depends on CONFIG_INIT
         help
           Stop all processes and (try to) power off the system.
 
 config CONFIG_REBOOT
         bool "reboot"
         default y
-        depends on CONFIG_INIT
         help
           Stop all processes and reboot the system.
 
 config CONFIG_MINIT
         bool "minit"
         default n
+        depends on ! CONFIG_INIT
         help
           Minimal init, based on minit v0.9.1.  This is a simple
           init replacement that handles starting/stopping services,
diff --git a/init/halt.c b/init/halt.c
index 10f16c75d..decdaeafd 100644
--- a/init/halt.c
+++ b/init/halt.c
@@ -2,7 +2,6 @@
 /*
  * Mini halt implementation for busybox
  *
- * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
  * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,12 +20,29 @@
  *
  */
 
-#include "busybox.h"
 #include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/reboot.h>
+#include "busybox.h"
 #include "init_shared.h"
 
 
 extern int halt_main(int argc, char **argv)
 {
+        char *delay; /* delay in seconds before rebooting */
+
+        if(bb_getopt_ulflags(argc, argv, "d:", &delay)) {
+                sleep(atoi(delay));
+        }
+
+#ifndef CONFIG_INIT
+#ifndef RB_HALT_SYSTEM
+#define RB_HALT_SYSTEM          0xcdef0123
+#endif
+        return(bb_shutdown_system(RB_HALT_SYSTEM));
+#else
         return kill_init(SIGUSR1);
+#endif
 }
diff --git a/init/init_shared.c b/init/init_shared.c
index 842942fe3..81e1ea056 100644
--- a/init/init_shared.c
+++ b/init/init_shared.c
@@ -1,9 +1,35 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Stuff shared between init, reboot, halt, and poweroff
+ *
+ * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
 #include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/reboot.h>
+#include <sys/reboot.h>
+#include <sys/syslog.h>
 #include "busybox.h"
-
 #include "init_shared.h"
 
-
 extern int kill_init(int sig)
 {
 #ifdef CONFIG_FEATURE_INITRD
@@ -19,3 +45,54 @@ extern int kill_init(int sig)
         return(kill(1, sig));
 #endif
 }
+
+#ifndef CONFIG_INIT
+#define LOG                             0x1
+#define CONSOLE                 0x2
+extern int bb_shutdown_system(unsigned long magic)
+{
+        int pri = LOG_KERN|LOG_NOTICE|LOG_FACMASK;
+        char *message;
+
+    /* Don't kill ourself */
+    signal(SIGTERM,SIG_IGN);
+    signal(SIGHUP,SIG_IGN);
+    setpgrp();
+
+    /* Allow Ctrl-Alt-Del to reboot system. */
+#ifndef RB_ENABLE_CAD
+#define RB_ENABLE_CAD   0x89abcdef
+#endif
+    reboot(RB_ENABLE_CAD);
+
+        openlog("shutdown", 0, pri);
+
+        message = "\n\rThe system is going down NOW !!\n";
+        syslog(pri, "%s", message);
+        fprintf(stdout, "%s", message);
+
+    sync();
+
+    /* Send signals to every process _except_ pid 1 */
+        message = "\rSending SIGTERM to all processes.\n";
+        syslog(pri, "%s", message);
+        fprintf(stdout, "%s", message);
+
+    kill(-1, SIGTERM);
+    sleep(1);
+    sync();
+
+        message = "\rSending SIGKILL to all processes.\n";
+        syslog(pri, "%s", message);
+        fprintf(stdout, "%s", message);
+
+    kill(-1, SIGKILL);
+    sleep(1);
+
+    sync();
+
+    reboot(magic);
+    return 0; /* Shrug */
+}
+#endif
+
diff --git a/init/init_shared.h b/init/init_shared.h
index d10a1bd3b..1e4cfac98 100644
--- a/init/init_shared.h
+++ b/init/init_shared.h
@@ -1 +1,3 @@
 extern int kill_init(int sig);
+extern int bb_shutdown_system(unsigned long magic);
+
diff --git a/init/poweroff.c b/init/poweroff.c
index d630aa6c2..e5d45dfa0 100644
--- a/init/poweroff.c
+++ b/init/poweroff.c
@@ -2,7 +2,6 @@
 /*
  * Mini poweroff implementation for busybox
  *
- * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
  * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,10 +20,37 @@
  *
  */
 
-#include "busybox.h"
 #include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/reboot.h>
+#include "busybox.h"
+#include "init_shared.h"
+
 
 extern int poweroff_main(int argc, char **argv)
 {
+        char *delay; /* delay in seconds before rebooting */
+
+        if(bb_getopt_ulflags(argc, argv, "d:", &delay)) {
+                sleep(atoi(delay));
+        }
+
+#ifndef CONFIG_INIT
+#ifndef RB_POWER_OFF
+#define RB_POWER_OFF            0x4321fedc
+#endif
+        return(bb_shutdown_system(RB_POWER_OFF));
+#else
         return kill_init(SIGUSR2);
+#endif
 }
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
diff --git a/init/reboot.c b/init/reboot.c
index 5ca8b588a..a3c0000f1 100644
--- a/init/reboot.c
+++ b/init/reboot.c
@@ -2,7 +2,6 @@
 /*
  * Mini reboot implementation for busybox
  *
- * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
  * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -30,11 +29,6 @@
 #include "init_shared.h"
 
 
-#ifndef RB_ENABLE_CAD
-static const int RB_ENABLE_CAD = 0x89abcdef;
-static const int RB_AUTOBOOT = 0x01234567;
-#endif
-
 extern int reboot_main(int argc, char **argv)
 {
         char *delay; /* delay in seconds before rebooting */
@@ -43,34 +37,13 @@ extern int reboot_main(int argc, char **argv)
                 sleep(atoi(delay));
         }
 
-#ifdef CONFIG_USER_INIT
-                /* Don't kill ourself */
-        signal(SIGTERM,SIG_IGN);
-        signal(SIGHUP,SIG_IGN);
-        setpgrp();
-
-                /* Allow Ctrl-Alt-Del to reboot system. */
-                reboot(RB_ENABLE_CAD);
-
-                message(CONSOLE|LOG, "\n\rThe system is going down NOW !!\n");
-                sync();
-
-                /* Send signals to every process _except_ pid 1 */
-                message(CONSOLE|LOG, "\rSending SIGTERM to all processes.\n");
-                kill(-1, SIGTERM);
-                sleep(1);
-                sync();
-
-                message(CONSOLE|LOG, "\rSending SIGKILL to all processes.\n");
-                kill(-1, SIGKILL);
-                sleep(1);
-
-                sync();
-
-                reboot(RB_AUTOBOOT);
-                return 0; /* Shrug */
+#ifndef CONFIG_INIT
+#ifndef RB_AUTOBOOT
+#define RB_AUTOBOOT                             0x01234567
+#endif
+        return(bb_shutdown_system(RB_AUTOBOOT));
 #else
-        return kill_init(SIGTERM);
+        return kill_init(SIGUSR2);
 #endif
 }