table of contents
|ACL_CALC_MASK(3)||Library Functions Manual||ACL_CALC_MASK(3)|
calculate the file group class mask
Linux Access Control Lists library (libacl, -lacl).
function calculates and sets the permissions associated with the ACL_MASK
ACL entry of the ACL referred to by acl_p. The value
of the new permissions is the union of the permissions granted by all
entries of tag type ACL_GROUP, ACL_GROUP_OBJ, or ACL_USER. If the ACL
referred to by acl_p already contains an ACL_MASK
entry, its permissions are overwritten; if it does not contain an ACL_MASK
entry, one is added.
If the ACL referred to by acl_p does not contain enough space for the new ACL entry, then additional working storage may be allocated. If the working storage cannot be increased in the current location, then it may be relocated and the previous working storage is released and a pointer to the new working storage is returned via acl_p.
The order of existing entries in the ACL is undefined after this function.
Any existing ACL entry descriptors that refer to entries in the ACL continue to refer to those entries. Any existing ACL pointers that refer to the ACL referred to by acl_p continue to refer to the ACL.
acl_calc_mask() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate the
If any of the following conditions occur, the
acl_calc_mask() function returns
-1 and sets errno to the
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
Derived from the FreeBSD manual pages written by Robert N M Watson ⟨rwatson@FreeBSD.org⟩, and adapted for Linux by Andreas Gruenbacher ⟨firstname.lastname@example.org⟩.
|March 23, 2002||Linux ACL|