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umask.2, open.2, mknod.2, mkdir.2: Explain what default ACLs do 

Explain the effect that default ACLs have (instead of the umask)
in umask.2.  Mention that default ACLs can have an affect in
open.2, mknod.2, and mkdir.2.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Andreas Gruenbacher 2015-04-13 19:38:52 +02:00 committed by Michael Kerrisk
parent ed948c28b3
commit 5d817eb475
4 changed files with 18 additions and 6 deletions
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5
man2/mkdir.2
View File

@ -54,7 +54,8 @@ The argument
specifies the permissions to use.
It is modified by the process's
.I umask
in the usual way: the permissions of the created directory are
in the usual way: in the absence of a default acl, the permissions of the
created directory are
.RI ( mode " & ~" umask " & 0777)."
Other mode bits of the created directory depend on the operating system.
For Linux, see below.
@ -212,8 +213,6 @@ POSIX.1-2008.
Under Linux, apart from the permission bits, only the
.B S_ISVTX
mode bit is honored.
That is, under Linux the created directory actually gets mode
.RI ( mode " & ~" umask " & 01777)."
See also
.BR stat (2).
.PP

5
man2/mknod.2
View File

@ -63,8 +63,9 @@ listed below and the permissions for the new node.
The permissions are modified by the process's
.I umask
in the usual way: the permissions of the created node are
.IR "(mode & ~umask)" .
in the usual way: in the absence of a default acl, the permissions of the
created node are
.RI ( mode " & ~" umask ).
The file type must be one of
.BR S_IFREG ,

3
man2/open.2
View File

@ -275,7 +275,8 @@ is ignored.
The effective permissions are modified by
the process's
.I umask
in the usual way: The permissions of the created file are
in the usual way: In the absence of a default acl, the permissions of the
created file are
.IR "(mode\ &\ ~umask)" .
Note that this mode applies only to future accesses of the
newly created file; the

11
man2/umask.2
View File

@ -63,6 +63,17 @@ argument to
and
.BR mkdir (2).
Alternatively, if the parent directory has a default acl (see
.BR acl (5)),
the umask is ignored, the default acl is inherited, the permission bits are set
based on the inherited acl, and permission bits absent in the
.I mode
argument are turned off. For example, the default acl
u::rwx,g::r-x,o::r-x is equivalent to a umask of 022, and with a
.I mode
argument of 0666 (rw-rw-rw-), the resulting file permissions are 0644
(rw-r--r--).
The constants that should be used to specify
.I mask
are described under