kern: Allow O_CLOFORK to be passed to shm_open(2)

Signed-off-by: Ricardo Branco <rbranco@suse.de>

Reviewed by: kib
Pull Request: https://github.com/freebsd/freebsd-src/pull/1802

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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Remove $FreeBSD$: two-line nroff pattern

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

shm: Document shm_create_largepage()

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

Reviewed by: pauamma,

shm: Document shm_create_largepage()

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

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

PR: 258957
Submitted by: sigsys@gmail.com
MFC after: 1 week

shm_open(2): Cross-reference posixshmcontrol(1)

When debugging POSIX shared memory issues, it's really
useful to learn that there is a command line tool now
to manipulate shared memory segments.

Re

shm_open(2): Cross-reference posixshmcontrol(1)

When debugging POSIX shared memory issues, it's really
useful to learn that there is a command line tool now
to manipulate shared memory segments.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D30896

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Add an shm_rename syscall

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

Add an shm_rename syscall

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 <matthew.bryan@isilon.com>
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

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Add linux-compatible memfd_create

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 qem

Add linux-compatible memfd_create

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

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Mention sendfile(2) by popular demand.

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.

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)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

shm_open(2): Fixed the history information.

While here, sort xrefs.

Reviewed by: jhb

General mdoc(7) and typo fixes.

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

Remove superfluous paragraph macro.

Fix typos, spelling, formatting and mdoc mistakes found by Nobuyuki while
translating these manual pages. Minor corrections by me.

Submitted by: Nobuyuki Koganemaru <n-kogane@syd.odn.ne.jp>

You must include fcntl.h (in practice) to be able to do anything useful
with shm_open(2), as otherwise the O_ flags are undefined.

MFC after: 3 days

Add a new file descriptor type for IPC shared memory objects and use it to
implement shm_open(2) and shm_unlink(2) in the kernel:
- Each shared memory file descriptor is associated with a swap-backed

Add a new file descriptor type for IPC shared memory objects and use it to
implement shm_open(2) and shm_unlink(2) in the kernel:
- Each shared memory file descriptor is associated with a swap-backed vm
object which provides the backing store. Each descriptor starts off with
a size of zero, but the size can be altered via ftruncate(2). The shared
memory file descriptors also support fstat(2). read(2), write(2),
ioctl(2), select(2), poll(2), and kevent(2) are not supported on shared
memory file descriptors.
- shm_open(2) and shm_unlink(2) are now implemented as system calls that
manage shared memory file descriptors. The virtual namespace that maps
pathnames to shared memory file descriptors is implemented as a hash
table where the hash key is generated via the 32-bit Fowler/Noll/Vo hash
of the pathname.
- As an extension, the constant 'SHM_ANON' may be specified in place of the
path argument to shm_open(2). In this case, an unnamed shared memory
file descriptor will be created similar to the IPC_PRIVATE key for
shmget(2). Note that the shared memory object can still be shared among
processes by sharing the file descriptor via fork(2) or sendmsg(2), but
it is unnamed. This effectively serves to implement the getmemfd() idea
bandied about the lists several times over the years.
- The backing store for shared memory file descriptors are garbage
collected when they are not referenced by any open file descriptors or
the shm_open(2) virtual namespace.

Submitted by: dillon, peter (previous versions)
Submitted by: rwatson (I based this on his version)
Reviewed by: alc (suggested converting getmemfd() to shm_open())

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Sort sections.

Fix the NAME section making whatis(1) happy in particular.

Mechanically kill hard sentence breaks.

mdoc(7) police: Use the new .In macro for #include statements.

MFS: in HISTORY section, fix release number of first appearance

``.St -p1003.1b'' -> ``.St -p1003.1b-93''.

mdoc(7) police: Nm -> Fn where appropriate.

mdoc(7) police: use certified section headers wherever possible.