man-pages-5.13 is released

["Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>]

Gidday,

Alex Colomar and I are proud to announce:

    man-pages-5.13 - man pages for Linux

This release resulted from patches, bug reports, reviews, and
comments from 40 contributors. The release includes
around 200 commits that changed approximately 120 pages.

Tarball download:
    http://www.kernel.org/doc/man-pages/download.html
Git repository:
    https://git.kernel.org/cgit/docs/man-pages/man-pages.git/
Online changelog:
    http://man7.org/linux/man-pages/changelog.html#release_5.13

A short summary of the release is blogged at:
https://linux-man-pages.blogspot.com/2021/08/man-pages-513-released.html

The current version of the pages is browsable at:
http://man7.org/linux/man-pages/

A selection of changes in this release that may be of interest
to readers of LKML is shown below.

Cheers,

Michael

==================== Changes in man-pages-5.13 ====================

Released: 2021-08-27, Christchurch


New and rewritten pages
-----------------------

mount_setattr.2
    Christian Brauner  [Alejandro Colomar, Michael Kerrisk]
        New manual page documenting the mount_setattr() system call


Newly documented interfaces in existing pages
---------------------------------------------

futex.2
    Kurt Kanzenbach  [Alejandro Colomar, Thomas Gleixner, Michael Kerrisk]
        Document FUTEX_LOCK_PI2

ioctl_tty.2
    Pali Rohár  [Alejandro Colomar, Michael kerrisk]
        Document ioctls: TCGETS2, TCSETS2, TCSETSW2, TCSETSF2

pidfd_open.2
    Michael Kerrisk
        Document PIDFD_NONBLOCK

seccomp_unotify.2
    Rodrigo Campos  [Alejandro Colomar]
        Document SECCOMP_ADDFD_FLAG_SEND

sigaction.2
    Peter Collingbourne  [Alejandro Colomar, Michael Kerrisk]
        Document SA_EXPOSE_TAGBITS and the flag support detection protocol

statx.2
    NeilBrown
        Document STATX_MNT_ID

capabilities.7
user_namespaces.7
    Michael Kerrisk, Kir Kolyshkin  [Alejandro Colomar]
        Describe CAP_SETFCAP for mapping UID 0

mount_namespaces.7
    Michael Kerrisk  [Christian Brauner, Eric W. Biederman]
        More clearly explain the notion of locked mounts
            For a long time, this manual page has had a brief discussion of
            "locked" mounts, without clearly saying what this concept is, or
            why it exists. Expand the discussion with an explanation of what
            locked mounts are, why mounts are locked, and some examples of the
            effect of locking.

user_namespaces.7
    Michael Kerrisk
        Document /proc/PID/projid_map

ld.so.8
    Michael Kerrisk
        Document --list-tunables option added in glibc 2.33


Global changes
--------------

Various pages
    Michael Kerrisk
        Fix EBADF error description
            Make the description of the EBADF error for invalid 'dirfd' more
            uniform. In particular, note that the error only occurs when the
            pathname is relative, and that it occurs when the 'dirfd' is
            neither valid *nor* has the value AT_FDCWD.

Various pages
    Michael Kerrisk
        Terminology clean-up: "mount point" ==> "mount"
            Many times, these pages use the terminology "mount point", where
            "mount" would be better. A "mount point" is the location at which
            a mount is attached. A "mount" is an association between a
            filesystem and a mount point.


Changes to individual pages
---------------------------

mount.2
    Michael Kerrisk
        ERRORS: add EPERM error for case where a mount is locked
            Refer the reader to mount_namespaces(7) for details.

open.2
    Michael Kerrisk
        Explicitly describe the EBADF error that can occur with openat()
            In particular, specifying an invalid file descriptor number
            in 'dirfd' can be used as a check that 'pathname' is absolute.
    Michael Kerrisk
        Clarify that openat()'s dirfd must be opened with O_RDONLY or O_PATH

seccomp.2
    Eric W. Biederman  [Kees Cook]
        Clarify that bad system calls kill the thread (not the process)

syscalls.2
    Michael Kerrisk
        Add quotactl_fd(); remove quotactl_path()
            quotactl_path() was never wired up in Linux 5.13.
            It was replaced instead by quotactl_fd(),
    Michael Kerrisk
        Add system calls that are new in 5.13

wait.2
    Michael Kerrisk
        ERRORS: document EAGAIN for waitid() on a PID file descriptor

termios.3
    Pali Rohár  [Alejandro Colomar]
        SPARC architecture has 4 different Bnnn constants
    Pali Rohár  [Alejandro Colomar]
        Add information how to set baud rate to any other value
    Pali Rohár  [Alejandro Colomar]
        Use bold style for Bnn and EXTn macro constants
    Pali Rohár  [Alejandro Colomar]
        Document missing baud-rate constants

vdso.7
    Michael Kerrisk  [Christophe Leroy]
        Update CLOCK_REALTIME_COARSE + CLOCK_MONOTONIC_COARSE info for powerpc
    Alejandro Colomar  [Christophe Leroy]
        Add y2038 compliant gettime for ppc/32

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/