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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-06-26 15:06:07 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-09-12 14:04:45 +0100 |
| commit | 40ff9e27dc653d3a55d797101847db5f1c3deaeb (patch) | |
| tree | 364fa5aae32419561364b72dd78a31642757b6be | |
| parent | 0d86f490759b16d51f4eb8c474fa7627abfbff45 (diff) | |
| download | man-pages-40ff9e27dc653d3a55d797101847db5f1c3deaeb.tar.gz | |
fcntl.2: Note an important detail of F_SETOWN permission rules for signals
F_SETOWN records the caller's credentials at the time of
the fcntl() call, and it is these saved credentials that
are used for subsequent permission checks.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/fcntl.2 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/man2/fcntl.2 b/man2/fcntl.2 index cac8a427cc..6074d601ec 100644 --- a/man2/fcntl.2 +++ b/man2/fcntl.2 @@ -733,6 +733,13 @@ where the sending process is the one that employs (but see BUGS below). If this permission check fails, then the signal is silently discarded. +.IR Note : +The +.BR F_SETOWN +operation records the caller's credentials at the time of the +.BR fcntl () +call, +and it is these saved credentials that are used for the permission checks. If the file descriptor .I fd |