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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Copyright (c) 2019 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\"
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.TH IPC_NAMESPACES 7 2019-08-02 "Linux" "Linux Programmer's Manual"
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.SH NAME
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namespaces \- overview of Linux IPC namespaces
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.SH DESCRIPTION
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IPC namespaces isolate certain IPC resources,
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namely, System V IPC objects (see
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.BR sysvipc (7))
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and (since Linux 2.6.30)
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.\" commit 7eafd7c74c3f2e67c27621b987b28397110d643f
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.\" https://lwn.net/Articles/312232/
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POSIX message queues (see
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.BR mq_overview (7)).
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The common characteristic of these IPC mechanisms is that IPC
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objects are identified by mechanisms other than filesystem
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pathnames.
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.PP
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Each IPC namespace has its own set of System V IPC identifiers and
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its own POSIX message queue filesystem.
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Objects created in an IPC namespace are visible to all other processes
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that are members of that namespace,
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but are not visible to processes in other IPC namespaces.
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.PP
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The following
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.I /proc
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interfaces are distinct in each IPC namespace:
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.IP * 3
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The POSIX message queue interfaces in
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.IR /proc/sys/fs/mqueue .
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.IP *
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The System V IPC interfaces in
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.IR /proc/sys/kernel ,
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namely:
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.IR msgmax ,
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.IR msgmnb ,
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.IR msgmni ,
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.IR sem ,
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.IR shmall ,
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.IR shmmax ,
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.IR shmmni ,
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and
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.IR shm_rmid_forced .
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.IP *
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The System V IPC interfaces in
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.IR /proc/sysvipc .
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.PP
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When an IPC namespace is destroyed
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(i.e., when the last process that is a member of the namespace terminates),
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all IPC objects in the namespace are automatically destroyed.
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.PP
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Use of IPC namespaces requires a kernel that is configured with the
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.B CONFIG_IPC_NS
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option.
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.SH SEE ALSO
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.BR nsenter (1),
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.BR unshare (1),
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.BR clone (2),
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.BR setns (2),
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.BR unshare (2),
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.BR mq_overview (7),
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.BR namespaces (7),
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.BR sysvipc (7)
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