src/lib/libc/sys/shm_open.2, branch stable/13

Remove $FreeBSD$: two-line nroff pattern

2023-08-23T17:43:31+00:00

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

Similar commit in main:
(cherry picked from commit fa9896e082a1)

shm: Document shm_create_largepage()

2023-02-20T16:24:08+00:00

While here, move notes about FreeBSD-specific functionality to the
COMPATIBILITY section, and document the ECAPMODE error for shm_open().

Reviewed by:	pauamma, kib
MFC after:	2 weeks
Sponsored by:	Klara, Inc.
Sponsored by:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D38282

(cherry picked from commit 5f03f96fbefbb5c68a5d7d06728ff5b4a05f87b0)

Fix mistakes in link(2) and shm_open(2)

2021-10-10T09:21:18+00:00

PR:	258957

(cherry picked from commit 8d3cd7767a2ea1816c31e1dbe7957253e723e559)

Add an shm_rename syscall

2019-09-26T15:32:28+00:00

Add an atomic shm rename operation, similar in spirit to a file
rename. Atomically unlink an shm from a source path and link it to a
destination path. If an existing shm is linked at the destination
path, unlink it as part of the same atomic operation. The caller needs
the same permissions as shm_unlink to the shm being renamed, and the
same permissions for the shm at the destination which is being
unlinked, if it exists. If those fail, EACCES is returned, as with the
other shm_* syscalls.

truss support is included; audit support will come later.

This commit includes only the implementation; the sysent-generated
bits will come in a follow-on commit.

Submitted by:	Matthew Bryan 
Reviewed by:	jilles (earlier revision)
Reviewed by:	brueffer (manpages, earlier revision)
Relnotes:	yes
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D21423

Add linux-compatible memfd_create

2019-09-25T18:03:18+00:00

memfd_create is effectively a SHM_ANON shm_open(2) mapping with optional
CLOEXEC and file sealing support. This is used by some mesa parts, some
linux libs, and qemu can also take advantage of it and uses the sealing to
prevent resizing the region.

This reimplements shm_open in terms of shm_open2(2) at the same time.

shm_open(2) will be moved to COMPAT12 shortly.

Reviewed by:	markj, kib
Differential Revision:	https://reviews.freebsd.org/D21393

Mention sendfile(2) by popular demand.

2017-01-20T17:29:59+00:00

Submitted by:	alc, kib
MFC after:	1 week
Sponsored by:	iXsystems
Differential Revision:	https://reviews.freebsd.org/D9259

Update the shm_open.2 man page to reflect objective reality.

2017-01-13T19:41:02+00:00

PR:		215612
Submitted by:	rwatson
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D9066

use .Mt to mark up email addresses consistently (part4)

2014-06-23T08:25:03+00:00

PR:		191174
Submitted by:	Franco Fichtner

shm_open(2): Fixed the history information.

2013-12-18T12:18:17+00:00

While here, sort xrefs.

Reviewed by:	jhb

General mdoc(7) and typo fixes.

2012-05-08T18:56:21+00:00

PR:		167713
Submitted by:	Nobuyuki Koganemaru (kogane!jp.freebsd.org)