reboot.2: Add "Linux" to kernel version numbers

Signed-off-by: Elie De Brauwer <eliedebrauwer@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

reboot.2: Mention RB_POWER_OFF

The manpage did not mention RB_POWER_OFF which is the glibc
symbolic name for LINUX_REBOOT_CMD_POWER_OFF.

$ cd /usr/include
$ cat x86_64-linux-gnu/sys/reboot.h | grep POWER_OFF
 define RB_POWER_OFF 0x4321fedc

Signed-off-by: Elie De Brauwer <eliedebrauwer@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

pthread_kill.3: POSIX.1-2008 removes ESRCH

POSIX.1-2001 mistakenly documented an ESRCH error, and
POSIX.1-2008 removes this error. Glibc does return
this error in cases where it can determine that a thread ID
is invalid, but equally, the use of an invalid thread ID
can cause a segmentation fault.

See http://thread.gmane.org/gmane.comp.lib.glibc.alpha/35598
Subject: Race and segmentation fault in pthread_kill() vs thread teardown
Newsgroups: gmane.comp.lib.glibc.alpha
Date: 2013-10-02 04:06:04 GMT

See http://udrepper.livejournal.com/16844.html

Reported-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

cmsg.3: tfix: be not --> not be

Signed-off-by: Shawn Landden <shawn@churchofgit.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

mkstemp.3: Better describe 'flags' that can be specified for mkostemp()

As reported by Janne Blomqvist:

currently the man page for mkostemp/mkostemps says:

    The mkostemp() function is like mkstemp(), with the
    difference that flags as for open(2) may be specified
    in flags (e.g., O_APPEND, O_SYNC).

To be more precise, the implementation massages the flags argument
as follows:

(flags & ~O_ACCMODE) | O_RDWR | O_CREAT | O_EXCL

That is, there is no need to explicitly include O_RDWR | O_CREAT |
O_EXCL in flags, as it's added implicitly.

So I suggest that the manpage should instead state that
*additional* flags may be specified in the flags argument.

This issue is a potential portability problem. FreeBSD 10+ also
has mkostemp{s}, but generates an error if O_RDWR | O_CREAT |
O_EXCL is present instead of silently accepting it. While
annoying, this difference in behavior seems Ok by the proposed
addition of mkostemp to some future POSIX standard, see

http://austingroupbugs.net/view.php?id=411

    The mkostemp() function shall be equivalent to the mkstemp()
    function, except that the flag argument may contain
    additional flags (from <fcntl.h>) to be used as if by open().
    Behavior is unspecified if the flag argument contains more
    than the following flags:

    O_APPEND Set append mode.

    O_CLOEXEC Set the FD_CLOEXEC file descriptor flag.

    <SIO>O_DSYNC Write according to the synchronized I/O data
    integrity completion.</SIO>

    <SIO>O_RSYNC Synchronized read I/O operations.</SIO>

    <XSI|SIO>O_SYNC Write according to synchronized I/O file
    integrity completion.</XSI|SIO>

Reported-by: Janne Blomqvist <blomqvist.janne@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

clock_getres.2: Improve description of CLOCK_PROCESS_CPUTIME_ID

See https://bugzilla.kernel.org/show_bug.cgi?id=67291

Reported-by: Nadav Har'El <nyh@math.technion.ac.il>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

credentials.7: Add details on controlling terminal and foreground/background jobs

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

credentials.7: List APIs that operate on process groups

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

sin.3: ATTRIBUTES: Note functions that are thread-safe

The functions sin(), sinf() and sinl() are thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

sigwait.3: ATTRIBUTES: Note function that is thread-safe

The function sigwait() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

sigqueue.3: ATTRIBUTES: Note function that is thread-safe

The function sigqueue() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

sigpause.3: ATTRIBUTES: Note function that is thread-safe

The function sigpause() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcpncpy.3: ATTRIBUTES: Note function that is thread-safe

The function wcpncpy() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ftw.3: tfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

boot.7: tfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: tstamp

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: Clarify issues with the disabled bit

Clarify the perf_event_open behavior with respect to the disabled
bit and creating event groups.

Reported-by: Sudhanshu Goswami <Sudhanshu.Goswami@emc.com>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2. Clarify issues with the exclusive bit

Warn that using the perf_event_open "exclusive" bit, while it might seem
like a good idea, might lead to all 0 results in some common usage cases.

Reported-by: Sudhanshu Goswami <Sudhanshu.Goswami@emc.com>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

mcheck.3: typo in compiler flag

See http://bugs.debian.org/732464

Reported-by: Raphael Geissert <geissert@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

towctrans.3: ATTRIBUTES: Note function that is thread-safe

The function towctrans() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

toupper.3: ATTRIBUTES: Note functions that are thread safe with exceptions

The functions toupper() and tolower() are thread safe with
exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

toascii.3: wfix

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

toascii.3: ATTRIBUTES: Note function that is thread-safe

The function toascii() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ualarm.3: ATTRIBUTES: Note function that is thread-safe

The function ualarm() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

sincos.3: ATTRIBUTES: Note functions that are thread-safe

The functions sincos(), sincosf() and sincosl() are thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

Start of man-pages-3.56: updating Changes and Changes.old

Start of man-pages-3.56: updating .Announce and .lsm files

Start of man-pages-3.56: renaming .Announce and .lsm files

Ready for 3.55

Removed trailing white space at end of lines

futex.2, send.2, setreuid.2, malloc.3, tcp.7: tstamp

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

Changes: Ready for 3.55

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: ffix + tstamp

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: Update description for mmap_data bit

Here's an updated version of [David Ahern's] patch that
expands the "mmap" definition as well as that of "mmap_data".
Also some manpage related formatting improvements from the
original patch.

Link: https://lkml.org/lkml/2013/11/11/505
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: cpu/pid argument cleanup

This patch attempts to clarify the pid and cpu options to
perf_event_open().

It does two things:
  1.  Tries to make clear that the "pid" argument can mean
      process *or* thread.  This is made confusing by
      how Linux uses the terms mostly interchangeably.
  2.  The cpu/pid documentation was confusing because of
      how the parameters are interdependent.  Since there
      are only 6 possible combinations I broke out the
      possibilities into a table.

Reported-by: Manuel Selva <selva.manuel@gmail.com>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcpcpy.3: ATTRIBUTES: Note function that is thread-safe

The function wcpcpy() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

stdarg.3: ATTRIBUTES: Note macros that are thread-safe

The macros va_start(), va_arg(), va_end() and va_copy() are
thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

usleep.3: ATTRIBUTES: Note function that is thread-safe

The function usleep() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

sigpending.2: Note treatment of signals that are blocked *and* ignored

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

stat.2: wspfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

unlockpt.3: ATTRIBUTES: Note function that is thread-safe

The function unlockpt() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ungetwc.3: ATTRIBUTES: Note function that is thread-safe

The function ungetwc() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

pipe.2: Fix error in example program

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: wfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: tfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

confstr.3: wfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

catopen.3: wfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

kcmp.2: wfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

kcmp.3: Reword slightly awkward section

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcscspn.3: ATTRIBUTES: Note function that is thread-safe

The function wcscspn() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcscpy.3: ATTRIBUTES: Note function that is thread-safe

The function wcscpy() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcscmp.3: ATTRIBUTES: Note function that is thread-safe

The function wcscmp() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcschr.3: ATTRIBUTES: Note function that is thread-safe

The function wcschr() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcscat.3: ATTRIBUTES: Note function that is thread-safe

The function wcscat() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsncasecmp.3: ATTRIBUTES: Note function that is thread safe with exceptions

The function wcsncasecmp() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsnlen.3: ATTRIBUTES: Note function that is thread-safe

The function wcsnlen() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsncpy.3: ATTRIBUTES: Note function that is thread-safe

The function wcsncpy() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsncmp.3: ATTRIBUTES: Note function that is thread-safe

The function wcsncmp() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

capget.2: wfix

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsncat.3: ATTRIBUTES: Note function that is thread-safe

The function wcsncat() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcscasecmp.3: ATTRIBUTES: Note function that is thread safe with exceptions

The function wcscasecmp() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcslen.3: ATTRIBUTES: Note function that is thread-safe

The function wcslen() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsrchr.3: ATTRIBUTES: Note function that is thread-safe

The function wcsrchr() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcspbrk.3: ATTRIBUTES: Note function that is thread-safe

The function wcspbrk() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcswidth.3: ATTRIBUTES: Note function that is thread safe with exceptions

The function wcswidth() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcstok.3: ATTRIBUTES: Note function that is thread-safe

The function wcstok() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcstoimax.3: ATTRIBUTES: Note functions that are thread safe with exceptions

The functions wcstoimax() and wcstoumax() are thread safe with
exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsstr.3: ATTRIBUTES: Note function that is thread-safe

The function wcsstr() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcsspn.3: ATTRIBUTES: Note function that is thread-safe

The function wcsspn() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wmemset.3: ATTRIBUTES: Note function that is thread-safe

The function wmemset() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wmemmove.3: ATTRIBUTES: Note function that is thread-safe

The function wmemmove() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wmemcpy.3: ATTRIBUTES: Note function that is thread-safe

The function wmemcpy() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ld.so.8: Fix crufty wording in one sentence

Reported-by: Alfred Agrell <alfred@agrell.info>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ftw.3: Explain probable cause of FTW_NS

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ftw.3: nftw() visits directories with FTW_D if FTW_DEPTH was not specified

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

tty_ioctl.4: Note that 'arg' should be 0 in the usual case when using TIOCSCTTY

Reported-by: Liu Jiaming <storypku@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

tty_ioctl.4: Rework text on root to discuss just in terms of capabilities

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

tty_ioctl.4: Minor change: break TIOCSCTTY into logically separate pieces

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

getaddrinfo.3: Explain one use case for AI_ADDRCONFIG

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

getaddrinfo.3: Highlight difference in ai_flags when hints==NULL

NOTES already described how glibc differs from POSIX.
Add a pointer to that text from the point in DESCRIPTION
where hints==NULL is discussed.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

poll.2: Clarify meaning of events==0

events==0 does not mean that revents is always returned as
zero. The "output only" events (POLLHUP, POLLERR, POLLNVAL)
can still be returned.

See https://bugzilla.kernel.org/show_bug.cgi?id=61911

Reported-by: Paolo Bonzini <bonzini@gnu.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

ioctl.2: 'request' argument is typed as 'unsigned long' in glibc

See https://bugzilla.kernel.org/show_bug.cgi?id=42705

Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reported-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

mq_receive.3: msg_len must be greater than *or equal to* mq_msgsize

See https://bugzilla.kernel.org/show_bug.cgi?id=64571

Reported-by: janh <a0vhv@t-online.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: tstamp + white space fixes

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: 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/

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: Linux 3.12 adds PERF_EVENT_IOC_ID

A new perf_event related ioctl, PERF_EVENT_IOC_ID, was added
in Linux 3.12.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: Linux 3.12 adds PERF_SAMPLE_IDENTIFIER

A new PERF_SAMPLE_IDENTIFIER sample type was added in Linux 3.12.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

perf_event_open.2: PERF_COUNT_SW_DUMMY support

Support for the PERF_COUNT_SW_DUMMY event type was added in
Linux 3.12.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

fallocate.2: tfix + tstamp

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

fallocate.2: Clarify the zeroing behavior

fallocate() zeroes only space that did not previously contain
data, but leaves existing data untouched.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wmemcmp.3: ATTRIBUTES: Note function that is thread-safe

The function wmemcmp() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wmemchr.3: ATTRIBUTES: Note function that is thread-safe

The function wmemchr() is thread safe.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wcwidth.3: ATTRIBUTES: Note function that is thread safe with exceptions

The function wcwidth() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wctype.3: ATTRIBUTES: Note function that is thread safe with exceptions

The function wctype() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

wctrans.3: ATTRIBUTES: Note function that is thread safe with exceptions

The function wctrans() is thread safe with exceptions.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

fexecve.3: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

send.2: RETURN VALUE: these calls return number of bytes (not characters) sent

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

tcp.7: Fix (nontrivial) wordo in discussion of MSG_TRUNC

s/MSG_PEEK/MSG_TRUNC/

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>