| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | BUGS | SEE ALSO | COLOPHON | The Linux Programming Interface |
SETNS(2) Linux Programmer's Manual SETNS(2)
setns - reassociate thread with a namespace
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <sched.h>
int setns(int fd, int nstype);
Given a file descriptor referring to a namespace, reassociate the calling
thread with that namespace.
The fd argument is a file descriptor referring to one of the namespace
entries in a /proc/[pid]/ns/ directory; see proc(5) for further information
on /proc/[pid]/ns/. The calling thread will be reassociated with the
corresponding namespace, subject to any constraints imposed by the nstype
argument.
The nstype argument specifies which type of namespace the calling thread
may be reassociated with. This argument can have one of the following
values:
0 Allow any type of namespace to be joined.
CLONE_NEWIPC
fd must refer to an IPC namespace.
CLONE_NEWNET
fd must refer to a network namespace.
CLONE_NEWUTS
fd must refer to a UTS namespace.
Specifying nstype as 0 suffices if the caller knows (or does not care) what
type of namespace is referred to by fd. Specifying a nonzero value for
nstype is useful if the caller does not know what type of namespace is
referred to by fd and wants to ensure that the namespace is of a particular
type. (The caller might not know the type of the namespace referred to by
fd if the file descriptor was opened by another process and, for example,
passed to the caller via a UNIX domain socket.)
On success, setns() returns 0. On failure, -1 is returned and errno is set
to indicate the error.
EBADF fd is not a valid file descriptor.
EINVAL fd refers to a namespace whose type does not match that specified in
nstype, or there is problem with reassociating the the thread with
the specified namespace.
ENOMEM Cannot allocate sufficient memory to change the specified namespace.
EPERM The calling thread did not have the required privilege
(CAP_SYS_ADMIN) for this operation.
The setns() system call first appeared in Linux in kernel 3.0; library
support was added to glibc in version 2.14.
The setns() system call is Linux-specific.
Not all of the attributes that can be shared when a new thread is created
using clone(2) can be changed using setns().
The PID namespace and the mount namespace are not currently supported.
(See the descriptions of CLONE_NEWPID and CLONE_NEWNS in clone(2).)
clone(2), fork(2), vfork(2), proc(5), unix(7)
This page is part of release 3.41 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be
found at http://www.kernel.org/doc/man-pages/.
Linux 2012-05-04 SETNS(2)
HTML rendering created 2012-05-11 by Michael Kerrisk,
author of
The Linux Programming Interface,
maintainer of the
Linux man-pages project