Mercurial > hg > toybox
view toys/other/unshare.c @ 877:37e668afd008
Isaac Dunham pointed out that the kernel treats - and _ as identical in module names, so modinfo should too. Made it use mmap() while I was there, and some cosmetic refactoring.
author | Rob Landley <rob@landley.net> |
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date | Wed, 24 Apr 2013 03:04:31 -0500 |
parents | 786841fdb1e0 |
children | 144d5ba7d410 |
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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(toys.optargs); }