ipc_namespaces(7) - phpMan

IPC_NAMESPACES(7)                   Linux Programmer's Manual                   IPC_NAMESPACES(7)

NAME
       ipc_namespaces - overview of Linux IPC namespaces

DESCRIPTION
       IPC  namespaces  isolate  certain  IPC  resources,  namely,  System  V  IPC  objects  (see
       sysvipc(7)) and (since Linux 2.6.30) POSIX message queues (see mq_overview(7)).  The  com-
       mon  characteristic  of  these IPC mechanisms is that IPC objects are identified by mecha-
       nisms other than filesystem pathnames.

       Each IPC namespace has its own set of System V IPC identifiers and its own  POSIX  message
       queue  filesystem.  Objects created in an IPC namespace are visible to all other processes
       that are members of that namespace, but are not visible to processes in  other  IPC  name-
       spaces.

       The following /proc interfaces are distinct in each IPC namespace:

       *  The POSIX message queue interfaces in /proc/sys/fs/mqueue.

       *  The  System  V IPC interfaces in /proc/sys/kernel, namely: msgmax, msgmnb, msgmni, sem,
          shmall, shmmax, shmmni, and shm_rmid_forced.

       *  The System V IPC interfaces in /proc/sysvipc.

       When an IPC namespace is destroyed (i.e., when the last process that is a  member  of  the
       namespace terminates), all IPC objects in the namespace are automatically destroyed.

       Use of IPC namespaces requires a kernel that is configured with the CONFIG_IPC_NS option.

SEE ALSO
       nsenter(1),  unshare(1),  clone(2),  setns(2),  unshare(2), mq_overview(7), namespaces(7),
       sysvipc(7)

COLOPHON
       This page is part of release 5.10 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at https://www.kernel.org/doc/man-pages/.

Linux                                       2019-08-02                          IPC_NAMESPACES(7)

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