fileno(3) differs from the other functions in various ways.
For example, it is governed by different standards,
and can set 'errno'. Conversely, the other functions
are about examining the status of a stream, while
fileno(3) simply obtains the underlying file descriptor.
Furthermore, splitting this function out allows
for some cleaner upcoming changes in ferror(3).
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Calling ipc() directly would be a rather unusual thing to do,
so add some text to emphasize that point.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
I filed a bug against glibc
requesting the wrapper for the new syscall.
Glibc bug: <https://sourceware.org/bugzilla/show_bug.cgi?id=27359>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The 'advice' subsection fell in the middle of other text in the
DESCRIPTION, which is a little confusing. Instead, move that
subsection to the end of the DESCRIPTION, and make some other
minor text reorganization so that related details are placed in
the same paragraphs.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
'malloc_trim' was and is never called from the 'free' function.
see related bug in glibc tracker:
https://sourceware.org/bugzilla/show_bug.cgi?id=2531. or
'__int_free' function. Only the top part of the heap is trimmed
after some calls to 'free', which is different from 'malloc_trim'
which also releases memory in between chunks from all the
arenas/heaps.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Move the the text describing how to set environment variable before
the list(s) of variables in order to improve readability.
[mtk: rewrote commit message]
Signed-off-by: Bastien Roucariès <rouca@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Clearly document that HOME, LOGNAME, SHELL and USER are set at
login time by a program like such as login(1).
Document also that using su could result in a mixed environment,
and point to the su(1) manual page.
[mtk: edited commit message]
Signed-off-by: Bastien Roucariès <rouca@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Add more details of how PATH is used, and mention the legacy
use of an empty prefix.
Changed after a suggested patch by Bastien Roucariès.
Reported-by: Bastien Roucariès <rouca@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Unlike SIOCGIFADDR and SIOCSIFADDR which are supported by many
protocol families, SIOCDIFADDR is supported by AF_INET6 and
AF_APPLETALK only.
Unlike other protocols, AF_INET6 uses struct in6_ifreq.
Cc: Dmitry V. Levin <ldv@altlinux.org>
Cc: <netdev@vger.kernel.org>
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Document the name=value system and that nul byte is forbidden.
Signed-off-by: Bastien Roucariès <rouca@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Say "execve(2)" instead of "exec(3)", and note that this step
starts a new program (not a new process!).
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Using _GNU_SOURCE to obtain the declaration of 'environ' is
nonstandard. Therefore, move the mention of this detail to NOTES.
At the same time, add a few words proposed by Bastien.
Cowritten-by: Bastien Roucariès <rouca@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
In man-pages-5.11, a large number of pages were edited to achieve
greater consistency in the SYNOPIS, RETURN VALUE and ATTRIBUTES
sections. To avoid future inconsistencies, try to capture some of
the preferred conventions in text in man-pages(7).
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
The msg_name field for recvmsg() call points to a caller-allocated buffer
nladdr that is used to return the source address of the (netlink) socket.
As recvmsg() does not read this buffer and fills it for a caller, do not
initialize it and instead check its value in the example.
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Michael Kerrisk