Move commands into "posix", "lsb", and "other" menus/directories.

1 files changed, 80 insertions, 0 deletions

diff --git a/toys/other/oneit.c b/toys/other/oneit.c
new file mode 100644
index 00000000..45935918
--- /dev/null
+++ b/toys/other/oneit.c
@@ -0,0 +1,80 @@
+/* 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);
+}