view toys/unshare.c @ 562:4d802d438983

Match uint64_t with PRIu64 to avoid warnings on 64 bit builds.
author Rob Landley <rob@landley.net>
date Sat, 14 Apr 2012 21:27:00 -0500
parents 99cb6ad605ee
children
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/* vi: set sw=4 ts=4:
 *
 * unshare.c - run command in new context
 *
 * Copyright 2011 Rob Landley <rob@landley.net>
 *
 * Not in SUSv4.

USE_UNSHARE(NEWTOY(unshare, "<1^nium", TOYFLAG_USR|TOYFLAG_BIN))

config UNSHARE
	bool "unshare"
	default y
	depends on TOYBOX_CONTAINER
	help
	  usage: unshare [-muin] COMMAND...

	  Create new namespace(s) for this process and its children, so some
	  attribute is not shared with the parent process.  This is part of
	  Linux Containers.  Each process can have its own:

	  -m	Mount/unmount tree
	  -u	Host and domain names
	  -i	SysV IPC (message queues, semaphores, shared memory)
	  -n	Network address, sockets, routing, iptables
*/

#include "toys.h"
#include <linux/sched.h>
extern int unshare (int __flags);

void unshare_main(void)
{
	unsigned flags[]={CLONE_NEWNS, CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWNET,0};
	unsigned f=0;
	int i;

	for (i=0; flags[i]; i++)
		if (toys.optflags & (1<<i))
			f |= flags[i];

	if(unshare(f)) perror_exit("failed");

	xexec(toys.optargs);
}