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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-09-12 07:29:15 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-09-12 07:39:40 +0100 |
| commit | ddf5e4ab24086f80ee6f86bd154dfadae166a95d (patch) | |
| tree | 89a920ed58d24a97a79e19879b7d5eff993878d0 /man2 | |
| parent | 40169a93c1d952460d1f6b1e3c441c11783f4ba9 (diff) | |
| download | man-pages-ddf5e4ab24086f80ee6f86bd154dfadae166a95d.tar.gz | |
open.2: Clarify the rules about how the group ID of a new file is determined
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man2')
| -rw-r--r-- | man2/open.2 | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/man2/open.2 b/man2/open.2 index 016c3cf4d2..28b92954f2 100644 --- a/man2/open.2 +++ b/man2/open.2 @@ -244,14 +244,19 @@ If the file does not exist, it will be created. The owner (user ID) of the new file is set to the effective user ID of the process. -The group ownership (group ID) is set either to -the effective group ID of the process or to the group ID of the -parent directory (depending on filesystem type and mount options, -and the mode of the parent directory; see the mount options + +The group ownership (group ID) of the new file is set either to +the effective group ID of the process (System V semantics) +or to the group ID of the parent directory (BSD semantics). +On Linux, the behavior depends on whether the +set-group-ID mode bit is set on the parent directory: +if that bit is set, then BSD semantics apply; +otherwise, System V semantics apply. +For some filesystems, the behavior also depends on the .I bsdgroups and .I sysvgroups -described in +mount options described in .BR mount (8)). .\" As at 2.6.25, bsdgroups is supported by ext2, ext3, ext4, and .\" XFS (since 2.6.14). |