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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2018-07-15 09:53:35 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2018-07-15 10:16:49 +0200 |
| commit | 4564dd1feee2118e34849a4f8530b75ceb96a78a (patch) | |
| tree | 673257b5aa72912306643c398f07b0af58cb52e8 /man7/unix.7 | |
| parent | b65f4c691de809da7d822f11301c01188a98f835 (diff) | |
| download | man-pages-4564dd1feee2118e34849a4f8530b75ceb96a78a.tar.gz | |
unix.7: If the buffer to receive SCM_RIGHTS FDs is too small, FDs are closed
If the ancillary data buffer for receiving SCM_RIGHTS file
descriptors is too small, then the excess file descriptors are
automatically closed in the receiving process. Verified by
experiment.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/unix.7')
| -rw-r--r-- | man7/unix.7 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/man7/unix.7 b/man7/unix.7 index f03e7bd120..17a10d3db0 100644 --- a/man7/unix.7 +++ b/man7/unix.7 @@ -381,6 +381,12 @@ Semantically, this operation is equivalent to duplicating .RB ( dup (2)) a file descriptor into the file descriptor table of another process. .IP +If the buffer used to receive the ancillary data containing +file descriptors is too small (or is absent), +then the ancillary data is truncated (or discarded) +and the excess file descriptors are automatically closed +in the receiving process. +.IP The kernel constant .BR SCM_MAX_FD defines a limit on the number of file descriptors in the array. |