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authorRob Landley <rob@landley.net>2012-08-25 14:25:22 -0500
committerRob Landley <rob@landley.net>2012-08-25 14:25:22 -0500
commit3a9241add947cb6d24b5de7a8927517426a78795 (patch)
treed122ab6570439cd6b17c7d73ed8d4e085e0b8a95 /toys/oneit.c
parent689f095bc976417bf50810fe59a3b3ac32b21105 (diff)
downloadtoybox-3a9241add947cb6d24b5de7a8927517426a78795.tar.gz
Move commands into "posix", "lsb", and "other" menus/directories.
Diffstat (limited to 'toys/oneit.c')
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diff --git a/toys/oneit.c b/toys/oneit.c
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-/* vi: set sw=4 ts=4:
- *
- * oneit.c, tiny one-process init replacement.
- *
- * Copyright 2005, 2007 by Rob Landley <rob@landley.net>.
- *
- * Not in SUSv3.
-
-USE_ONEIT(NEWTOY(oneit, "^<1c:p", TOYFLAG_SBIN))
-
-config ONEIT
- bool "oneit"
- default y
- help
- usage: oneit [-p] [-c /dev/tty0] command [...]
-
- A simple init program that runs a single supplied command line with a
- controlling tty (so CTRL-C can kill it).
-
- -p Power off instead of rebooting when command exits.
- -c Which console device to use.
-
- The oneit command runs the supplied command line as a child process
- (because PID 1 has signals blocked), attached to /dev/tty0, in its
- own session. Then oneit reaps zombies until the child exits, at
- which point it reboots (or with -p, powers off) the system.
-*/
-
-#include "toys.h"
-#include <sys/reboot.h>
-
-DEFINE_GLOBALS(
- char *console;
-)
-
-#define TT this.oneit
-
-// The minimum amount of work necessary to get ctrl-c and such to work is:
-//
-// - Fork a child (PID 1 is special: can't exit, has various signals blocked).
-// - Do a setsid() (so we have our own session).
-// - In the child, attach stdio to /dev/tty0 (/dev/console is special)
-// - Exec the rest of the command line.
-//
-// PID 1 then reaps zombies until the child process it spawned exits, at which
-// point it calls sync() and reboot(). I could stick a kill -1 in there.
-
-
-void oneit_main(void)
-{
- int i;
- pid_t pid;
-
- // Create a new child process.
- pid = vfork();
- if (pid) {
-
- // pid 1 just reaps zombies until it gets its child, then halts the system.
- while (pid!=wait(&i));
- sync();
-
- // PID 1 can't call reboot() because it kills the task that calls it,
- // which causes the kernel to panic before the actual reboot happens.
- if (!vfork()) reboot((toys.optflags&1) ? RB_POWER_OFF : RB_AUTOBOOT);
- sleep(5);
- _exit(1);
- }
-
- // Redirect stdio to /dev/tty0, with new session ID, so ctrl-c works.
- setsid();
- for (i=0; i<3; i++) {
- close(i);
- xopen(TT.console ? TT.console : "/dev/tty0",O_RDWR);
- }
-
- // Can't xexec() here, because we vforked so we don't want to error_exit().
- toy_exec(toys.optargs);
- execvp(*toys.optargs, toys.optargs);
- _exit(127);
-}