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>
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>
getaddrinfo.3: Explain one use case for AI_ADDRCONFIG

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

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>
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>
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>
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>
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>
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>
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>
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>
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>
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>
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>
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>
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>