man-pages-3.55 is released

[Michael Kerrisk (man-pages)]

Gidday,

I've released man-pages-3.55 - man pages for Linux.

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_3.55

A short summary of the release is blogged at:
http://linux-man-pages.blogspot.com/2013/12/man-pages-355-is-released.html

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

A few changes in this release that may be of interest to readers of
this list are given below.

Cheers,

Michael

==================== Changes in man-pages-3.55 ====================

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

fallocate.2
    Christoph Hellwig
        Clarify the zeroing behavior
            fallocate() zeroes only space that did not previously contain
            data, but leaves existing data untouched.

perf_event_open.2
    Vince Weaver
        Linux 3.12 rdpmc/mmap
            It turns out that the perf_event mmap page rdpmc/time setting was
            broken, dating back to the introduction of the feature.  Due
            to a mistake with a bitfield, two different values mapped to
            the same feature bit.

            A new somewhat backwards compatible interface was introduced
            in Linux 3.12.  A much longer report on the issue can be found
            here:
               https://lwn.net/Articles/567894/
    Vince Weaver
        Linux 3.12 adds PERF_SAMPLE_IDENTIFIER
            A new PERF_SAMPLE_IDENTIFIER sample type was added in Linux 3.12.
    Vince Weaver
        E2BIG documentation
            The following documents the E2BIG error return for
            perf_event_open().

            I actually ran into this error the hard way and it took me
            half a day to figure out why my ->size value was changing.
    Vince Weaver
        Linux 3.12 adds PERF_EVENT_IOC_ID
            A new perf_event related ioctl, PERF_EVENT_IOC_ID, was added
            in Linux 3.12.
    Vince Weaver
        PERF_COUNT_SW_DUMMY support
            Support for the PERF_COUNT_SW_DUMMY event type was added in
            Linux 3.12.
    Vince Weaver  [Andreas Sandberg]
        PERF_EVENT_IOC_PERIOD update
            The PERF_EVENT_IOC_PERIOD ioctl was broken until 2.6.36,
            and it turns out that the ARM architecture has some
            differing behavior too.

stat.2
    Michael Kerrisk
        Note filesystem support for nanosecond timestamps
            Add some detail on which native filesystems do and don't
            support nanosecond timestamps.
    Michael Kerrisk  [Yang Yang]
        Update discussion of nanosecond timestamps
            The existing text describes the timestamp fields as 'time_t'
            and delegates discussion of nanosecond timestamps under NOTES.
            Nanosecond timestamps have been around for a while now,
            and are in POSIX.1-2008, so reverse the orientation of the
            discussion, putting the nanosecond fields into DESCRIPTION
            and detailing the historical situation under NOTES.

tty_ioctl.4
    Michael Kerrisk  [Liu Jiaming]
        Note that 'arg' should be 0 in the usual case when using TIOCSCTTY

proc.5
    Michael Kerrisk
        Document /proc/sys/kernel/ngroups_max

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