From 399644e47874bff147afb19c89228901ac39340e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 15 Apr 2024 21:40:15 +0200 Subject: Adding upstream version 6.05.01. Signed-off-by: Daniel Baumann --- man7/ipc_namespaces.7 | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 man7/ipc_namespaces.7 (limited to 'man7/ipc_namespaces.7') diff --git a/man7/ipc_namespaces.7 b/man7/ipc_namespaces.7 new file mode 100644 index 0000000..0b13f07 --- /dev/null +++ b/man7/ipc_namespaces.7 @@ -0,0 +1,66 @@ +.\" Copyright (c) 2019 by Michael Kerrisk +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" +.TH ipc_namespaces 7 2023-02-05 "Linux man-pages 6.05.01" +.SH NAME +ipc_namespaces \- overview of Linux IPC namespaces +.SH DESCRIPTION +IPC namespaces isolate certain IPC resources, +namely, System V IPC objects (see +.BR sysvipc (7)) +and (since Linux 2.6.30) +.\" commit 7eafd7c74c3f2e67c27621b987b28397110d643f +.\" https://lwn.net/Articles/312232/ +POSIX message queues (see +.BR mq_overview (7)). +The common characteristic of these IPC mechanisms is that IPC +objects are identified by mechanisms other than filesystem +pathnames. +.PP +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 namespaces. +.PP +The following +.I /proc +interfaces are distinct in each IPC namespace: +.IP \[bu] 3 +The POSIX message queue interfaces in +.IR /proc/sys/fs/mqueue . +.IP \[bu] +The System V IPC interfaces in +.IR /proc/sys/kernel , +namely: +.IR msgmax , +.IR msgmnb , +.IR msgmni , +.IR sem , +.IR shmall , +.IR shmmax , +.IR shmmni , +and +.IR shm_rmid_forced . +.IP \[bu] +The System V IPC interfaces in +.IR /proc/sysvipc . +.PP +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. +.PP +Use of IPC namespaces requires a kernel that is configured with the +.B CONFIG_IPC_NS +option. +.SH SEE ALSO +.BR nsenter (1), +.BR unshare (1), +.BR clone (2), +.BR setns (2), +.BR unshare (2), +.BR mq_overview (7), +.BR namespaces (7), +.BR sysvipc (7) -- cgit v1.2.3