Re-add initrd support, unify halt/reboot/poweroff, add -n and -f options.

git-svn-id: svn://busybox.net/trunk/busybox@13701 69ca8d6d-28ef-0310-b511-8ec308f3f277

5 files changed, 56 insertions, 110 deletions

diff --git a/init/Config.in b/init/Config.in
index ba157081c..d5af54e47 100644
--- a/init/Config.in
+++ b/init/Config.in
@@ -12,21 +12,32 @@ config CONFIG_INIT
           init is the first program run when the system boots.
 
 config CONFIG_FEATURE_USE_INITTAB
-        bool "  Support reading an inittab file?"
+        bool "  Support reading an inittab file"
         default y
         depends on CONFIG_INIT
         help
           Allow init to read an inittab file when the system boot.
 
-config CONFIG_FEATURE_INITRD
-        bool "  Support running init from within an initrd?"
+config CONFIG_FEATURE_INIT_SCTTY
+        bool "  Support running commands with a controlling-tty"
+        default n
+        depends on CONFIG_INIT
+        help
+          If this option is enabled a command starting with hyphen (-)
+          is run in its own session (setsid(2)) and possibly with a
+          controlling tty (TIOCSCTTY).  This is not the traditional init
+          behavour, but is often what you want in an embedded system where
+          the console is only accessed during development or for maintenance.
+
+config CONFIG_FEATURE_EXTRA_QUIET
+        bool "  Be _extra_ quiet on boot"
         default y
         depends on CONFIG_INIT
         help
-          Allow init to be called from an initrd as linuxrc.
+          Prevent init from logging some messages to the console during boot.
 
 config CONFIG_FEATURE_INIT_COREDUMPS
-        bool "  Support dumping core for child processes (debugging only)?"
+        bool "  Support dumping core for child processes (debugging only)"
         default n
         depends on CONFIG_INIT
         help
@@ -35,30 +46,24 @@ config CONFIG_FEATURE_INIT_COREDUMPS
           core file sizes.  If this option is disabled, processes
           will not generate any core files.
 
-config CONFIG_FEATURE_INIT_SCTTY
-        bool "  Support running commands with a controlling-tty?"
-        default n
-        depends on CONFIG_INIT
-        help
-          If this option is enabled a command starting with hyphen (-)
-          is run in its own session (setsid(2)) and possibly with a
-          controlling tty (TIOCSCTTY).  This is not the traditional init
-          behavour, but is often what you want in an embedded system where
-          the console is only accessed during development or for maintenance.
 
-config CONFIG_FEATURE_EXTRA_QUIET
-        bool "  Should init be _extra_ quiet on boot?"
+
+config CONFIG_FEATURE_INITRD
+        bool "  Support running init from within an initrd (not initramfs)"
         default y
         depends on CONFIG_INIT
         help
-          Prevent init from logging some messages to the console
-          during boot.
+          Legacy support for running init under the old-style initrd.  Allows
+          the name linuxrc to act as init, and it doesn't assume init is PID 1.
+
+          This does not apply to initramfs, which runs /init as PID 1 and
+          requires no special support.
 
 config CONFIG_HALT
-        bool "halt"
+        bool "poweroff, halt, and reboot"
         default y
         help
-          Stop all processes and halt the system.
+          Stop all processes and either halt, reboot, or power off the system.
 
 config CONFIG_MESG
         bool "mesg"
@@ -67,17 +72,9 @@ config CONFIG_MESG
           Mesg controls access to your terminal by others.  It is typically
           used to allow or disallow other users to write to your terminal
 
-config CONFIG_POWEROFF
-        bool "poweroff"
         default y
         help
           Stop all processes and (try to) power off the system.
 
-config CONFIG_REBOOT
-        bool "reboot"
-        default y
-        help
-          Stop all processes and reboot the system.
-
 endmenu
 
diff --git a/init/halt.c b/init/halt.c
index 89efdd64a..34479742e 100644
--- a/init/halt.c
+++ b/init/halt.c
@@ -1,28 +1,42 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Mini halt implementation for busybox
+ * Poweroff reboot and halt, oh my.
  *
- * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright 2006 by Rob Landley <rob@landley.net>
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
 #include <signal.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <getopt.h>
 #include <sys/reboot.h>
 #include "busybox.h"
-#include "init_shared.h"
 
+#include <unistd.h>
 
-extern int halt_main(int argc, char **argv)
+int halt_main(int argc, char *argv[])
 {
-        char *delay; /* delay in seconds before rebooting */
+        char *delay = "hpr";
+        int which, flags, magic[] = {RB_HALT_SYSTEM, RB_POWER_OFF, RB_AUTOBOOT},
+                signals[] = {SIGUSR1, SIGUSR2, SIGTERM}, rc = 1;
+
+        /* Figure out which applet we're running */
+        for(which=0;delay[which]!=*bb_applet_name;which++);
 
-        if(bb_getopt_ulflags(argc, argv, "d:", &delay)) {
-                sleep(atoi(delay));
-        }
+        /* Parse and handle arguments */
+        flags = bb_getopt_ulflags(argc, argv, "d:nf", &delay);
+        if (flags&1) sleep(atoi(delay));
+        if (!(flags&2)) sync();
+        
+        /* Perform action. */
+        if (ENABLE_INIT && !(flags & 4)) {
+                if (ENABLE_FEATURE_INITRD) {
+                        long *pidlist=find_pid_by_name("linuxrc");
+                        if (*pidlist>0) rc = kill(*pidlist,signals[which]);
+                        if (ENABLE_FEATURE_CLEAN_UP) free(pidlist);
+                }
+                if (rc) rc = kill(1,signals[which]);
+        } else rc = reboot(magic[which]);
 
-        return ENABLE_INIT ? kill(1,SIGUSR1) : bb_shutdown_system(RB_HALT_SYSTEM);
+        if (rc) bb_error_msg("No.");
+        return rc;
 }
diff --git a/init/init.c b/init/init.c
index 337d31c2d..0db355413 100644
--- a/init/init.c
+++ b/init/init.c
@@ -751,14 +751,7 @@ static void exec_signal(int sig)
 static void halt_signal(int sig)
 {
         shutdown_system();
-        message(CONSOLE | LOG,
-#if #cpu(s390)
-                        /* Seems the s390 console is Wierd(tm). */
-                        "The system is halted. You may reboot now."
-#else
-                        "The system is halted. Press Reset or turn off power"
-#endif
-                );
+        message(CONSOLE | LOG, "The system is halted.");
         sync();
 
         /* allow time for last message to reach serial console */
@@ -1024,11 +1017,9 @@ extern int init_main(int argc, char **argv)
         }
 #ifndef DEBUG_INIT
         /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
-        if (getpid() != 1
-#ifdef CONFIG_FEATURE_INITRD
-                && strstr(bb_applet_name, "linuxrc") == NULL
-#endif
-                ) {
+        if (getpid() != 1 &&
+                (!ENABLE_FEATURE_INITRD || !strstr(bb_applet_name, "linuxrc")))
+        {
                 bb_show_usage();
         }
         /* Set up sig handlers  -- be sure to
diff --git a/init/poweroff.c b/init/poweroff.c
deleted file mode 100644
index b79bcd036..000000000
--- a/init/poweroff.c
+++ /dev/null
@@ -1,28 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * Mini poweroff implementation for busybox
- *
- * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
- *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- */
-
-#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));
-        }
-
-        return ENABLE_INIT ? kill(1,SIGUSR2) : bb_shutdown_system(RB_POWER_OFF);
-}
diff --git a/init/reboot.c b/init/reboot.c
deleted file mode 100644
index 5508f0be9..000000000
--- a/init/reboot.c
+++ /dev/null
@@ -1,28 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * Mini reboot implementation for busybox
- *
- * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
- *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- */
-
-#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 reboot_main(int argc, char **argv)
-{
-        char *delay; /* delay in seconds before rebooting */
-
-        if(bb_getopt_ulflags(argc, argv, "d:", &delay)) {
-                sleep(atoi(delay));
-        }
-
-        return ENABLE_INIT ? kill(1,SIGTERM) : bb_shutdown_system(RB_AUTOBOOT);
-}