Manpages - acl_calc_mask.3

Linux Access Control Lists library (libacl, -lacl).

The

function calculates and sets the permissions associated with the ACL_MASK ACL entry of the ACL referred to by

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

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

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

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

continue to refer to the ACL.

If any of the following conditions occur, the

function returns

and sets

to the corresponding value:

The argument

is not a valid pointer to an ACL.

The

function is unable to allocate the memory required for an ACL_MASK ACL entry.

IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)

Derived from the FreeBSD manual pages written by

and adapted for Linux by