shmfd: consistently return size in 512 byte blocks for fstat(2) st_blocks

This is ABI-breaking change that could be considered as the bug fix.

Requested by: David Timber <dxdt@dev.snart.me>
Reviewe

shmfd: consistently return size in 512 byte blocks for fstat(2) st_blocks

This is ABI-breaking change that could be considered as the bug fix.

Requested by: David Timber <dxdt@dev.snart.me>
Reviewed by: emaste, markj
Sponsored by: The FreeBSD Foundation
Relnotes: yes
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58942

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unix: allow connectat(2) to name the peer socket by descriptor

Accept an empty `sun_path` when `fd` is not `AT_FDCWD`: the descriptor
then names the peer unix socket directly, instead of being the s

unix: allow connectat(2) to name the peer socket by descriptor

Accept an empty `sun_path` when `fd` is not `AT_FDCWD`: the descriptor
then names the peer unix socket directly, instead of being the starting
directory for a pathname lookup. The held file reference keeps the peer
PCB stable, playing the role `unp_vp_mtxpool` plays in the pathname
path.

The descriptor must carry `CAP_CONNECTAT` and refer to an `AF_UNIX`
socket (`EPROTOTYPE` otherwise, `ENOTSOCK` for non-sockets). As with a
pathname, a stream/seqpacket peer must be listening. No filesystem
permission or MAC vnode check applies on this path: possession of the
descriptor is the authorization, as with descriptor passing.

Note this makes it possible to connect a datagram socket to an unbound
peer, which no pathname could previously name.

`connect(2)` and the implicit-connect send path pass `AT_FDCWD` and
still reject an empty path with `EINVAL`.

The `unp_sun_path()` call is hoisted out of `unp_connectat()` because the
early exit conditions for the two system calls (`connect(2)` and
`connectat(2)`) are slightly different.

Additionally, support `/dev/fd/<N>`. In a world with `connectat(2)`,
this is largely overkill, but this also allows me to add support for
direct peer connections with plain `connect(2)`. I think that is a wise
choice because this will allow me to propose this functionality for
Linux too without a new system call (saving that conversation for
later). Ultimately, I want to see multiple operating systems support
this to foster broader userland adoption, which should benefit everyone
including FreeBSD --- it's nicer if more 3rd party in addition to 1st
party software uses the new kernel functionality. Therefore, I hope this
additional feature is also acceptable.

Signed-off-by: John Ericson <John.Ericson@Obsidian.Systems>
Assisted-by: Claude Code (Claude Opus 4.8 and Fable 5)

Reviewed by: markj
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D58405

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pddupfd.2: fix errno value returned for non-procdesc argument

Noted and reviewed by: lwhsu
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/

pddupfd.2: fix errno value returned for non-procdesc argument

Noted and reviewed by: lwhsu
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58666

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manuals: Fix Fx and nearby mechanical typos

Fix compiler warnings related to the Fx macro, as well as all other
mechanical typos that were visible within one screenful of them. These
cause rendering

manuals: Fix Fx and nearby mechanical typos

Fix compiler warnings related to the Fx macro, as well as all other
mechanical typos that were visible within one screenful of them. These
cause rendering glitches on various toolchains with various of the five
and a half decades of rich output formats and tooling manpages scale to.

The *x macro set specifies operating systems. These macros take the rest
of the line as an argument. Sometimes, a space was not used to separate
the argument of Fx and the trailing period. Another, FreeBSD Foundation
was misrepresented as an operating system version instead of an author.
Two more had other parts of the sentence supplied as an argument to Fx.

While I had those open, fix the other mechancial typos visible on those
specific screenfulls. Fix a list width glitch, correct section typo
AUTHOR to AUTHORS, and switch AUTHORS sections containing prose to
prose-mode so that they wrap freely when rendered.

PR: 297248
MFC after: 3 days
Fixes: d39e310c7d6a ("man/man3: add stdbit.3")
Fixes: d790b16bbf0c ("add man pages for stdbit functions")
Fixes: b61850c4e6f6 ("net.link.bridge.member_ifaddrs to false")
Reported by: wosch (groff is complaining about incorrect Fx usage)

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stat.2: enhance the description of st_blocks

Reviewed by: emaste, mckusick
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential revision: https://reviews.freebsd.org/D58592

pdwait(2), wait(2): document interaction between pdopenpid() and waitpid()

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.or

pdwait(2), wait(2): document interaction between pdopenpid() and waitpid()

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58264

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mknod.2: properly document root requirements

Submitted by: Martijn Dekker <mcdutchie@hotmail.com>
PR: 297082
Fixes: 4090d103b0c3 ("mknod.2: update the man page")
MFC after: 3 days

Regenerate after fixing getfhat(2) prototype

_umtx_op.2: document the CVWAIT_UMTX_TIME flag for the UMTX_OP_CV_WAIT_UC request

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.fre

_umtx_op.2: document the CVWAIT_UMTX_TIME flag for the UMTX_OP_CV_WAIT_UC request

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58463

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mknod.2: update the man page

State that FIFOs can be created, document the requirement that
dev must be zero then. Mention whiteouts.

PR: 297082
Reviewed by: emaste
Sponsored by: The FreeBSD Found

mknod.2: update the man page

State that FIFOs can be created, document the requirement that
dev must be zero then. Mention whiteouts.

PR: 297082
Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential revision: https://reviews.freebsd.org/D58478

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Bump dates

Fixes: c8f5e6819d4d ("pwait: Optionally wait until process is reaped")
Fixes: eddd8aa99ca8 ("pwait: Add a SIGINFO handler")
Fixes: 356d0b79cf6f ("rc.subr: Fix premature return from wai

Bump dates

Fixes: c8f5e6819d4d ("pwait: Optionally wait until process is reaped")
Fixes: eddd8aa99ca8 ("pwait: Add a SIGINFO handler")
Fixes: 356d0b79cf6f ("rc.subr: Fix premature return from wait_for_pids")

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kqueue: Add NOTE_REAP

Add a NOTE_REAP event for EVFILTER_PROC which provides a notification
when the process is reaped.

MFC after: 1 week
Sponsored by: Klara, Inc.
Sponsored by: NetApp, Inc.
Review

kqueue: Add NOTE_REAP

Add a NOTE_REAP event for EVFILTER_PROC which provides a notification
when the process is reaped.

MFC after: 1 week
Sponsored by: Klara, Inc.
Sponsored by: NetApp, Inc.
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D58313

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procdesc: Disallow pddupfd() of non-passable files

Reported by: Maik Muench of Secfault Security
Reviewed by: kib
Fixes: 1ad21a652182 ("kern: add pddupfd(2)")
Sponsored by: The FreeBSD Foundation
D

procdesc: Disallow pddupfd() of non-passable files

Reported by: Maik Muench of Secfault Security
Reviewed by: kib
Fixes: 1ad21a652182 ("kern: add pddupfd(2)")
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D58403

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ptrace.2: document PT_GET_CHILDREN

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58315

kqueue.2: document EVFILT_PROCDESC support for NOTE_FORK

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58292

ptrace.2: Document PT_SET_SC_RET

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58247

kqueue.2: document NOTE_PDSIGCHLD

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58123

rename.2: Document AT_RENAME_EXCHANGE

Reviewed by: mckusick
Discussed with: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd

rename.2: Document AT_RENAME_EXCHANGE

Reviewed by: mckusick
Discussed with: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D57658

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pdfork.2: grammar

Submitted by: des
MFC after: 1 week

Regen.

pdfork.2: document pddupfd()

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D57163

libsys: export pddupfd(2)

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D57163

pdfork.2: grammar

Submitted by: des
MFC after: 1 week

Regen

pdfork.2: document pdopenpid(2)

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D57124