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annotate toys/other/unshare.c @ 1322:b91284c2e569 draft

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Make "losetup /dev/loop0 filename" work. Sigh. Implement the complex cases and you screw up the simple cases you already tested...
author Rob Landley <rob@landley.net>
date Thu, 29 May 2014 06:29:12 -0500
parents 0d0c01ac5c63
children 33b3b5f9e6c6
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1 /* unshare.c - run command in new context
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2 *
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3 * Copyright 2011 Rob Landley <rob@landley.net>
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4
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5 USE_UNSHARE(NEWTOY(unshare, "<1^niumpU", TOYFLAG_USR|TOYFLAG_BIN))
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6
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7 config UNSHARE
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8 bool "unshare"
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9 default y
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10 depends on TOYBOX_CONTAINER
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11 help
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12 usage: unshare [-muin] COMMAND...
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14 Create new namespace(s) for this process and its children, so some
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15 attribute is not shared with the parent process. This is part of
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16 Linux Containers. Each process can have its own:
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18 -i SysV IPC (message queues, semaphores, shared memory)
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19 -m Mount/unmount tree
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20 -n Network address, sockets, routing, iptables
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21 -p Process IDs and init
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22 -u Host and domain names
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23 -U UIDs, GIDs, capabilities
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24 */
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26 #include "toys.h"
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27 #include <linux/sched.h>
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99cb6ad605ee The linux header doesn't prototype unshare, and the glibc header introduced a regression in recent versions inexplicably crediting a linux feature to the FSF, so add the prototype ourselves.
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28 extern int unshare (int __flags);
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30 void unshare_main(void)
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31 {
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32 unsigned flags[]={CLONE_NEWNS, CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWNET,
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33 CLONE_NEWPID, CLONE_NEWUSER, 0};
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34 unsigned f=0;
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35 int i;
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37 for (i=0; flags[i]; i++) if (toys.optflags & (1<<i)) f |= flags[i];
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39 if(unshare(f)) perror_exit("failed");
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41 xexec_optargs(0);
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42 }