Mercurial > hg > toybox
view toys/unshare.c @ 551:2548e6e590b2
Add string to mode_t parser
added new function string_to_mode(char *m_string, mode_t base) which
parses a given string and converts it to a mode_t.
If either + or - are part of m_string the permissions are either
added or removed from base.
Currently support for permision copy is missing (e.g. g=u),
but all other flags should work.
Format for m_string: either symbolic modes or octal representation.
symbolic modes:
[auog][[+-=][rwxst]*]
examples:
string_to_mode("u=rwx,g=rw,o=r", 0);
string_to_mode("a-x", 0777);
string_to_mode("0744", 0);
author | Daniel Walter <d.walter@0x90.at> |
---|---|
date | Mon, 19 Mar 2012 19:57:56 -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); }