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/* unshare.c - run command in new context
*
* Copyright 2011 Rob Landley <rob@landley.net>
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_optargs(0);
}
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