The acl_calc_mask() function calculates and sets the permissions asso‐
ciated 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 func‐
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.
If any of the following conditions occur, the acl_calc_mask() function
returns -1 and sets errno to the corresponding value:
[EINVAL] The argument acl is not a valid pointer to an ACL.
[ENOMEM] The acl_calc_mask() function is unable to allocate
the memory required for an ACL_MASK ACL entry.
This page is part of the acl (manipulating access control lists)
project. Information about the project can be found at
http://savannah.nongnu.org/projects/acl. If you have a bug report for
this manual page, see http://savannah.nongnu.org/bugs/?group=acl. This
page was obtained from the project's upstream Git repository
git://git.savannah.nongnu.org/acl.git on 2017-04-25. If you discover
any rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON (which
is not part of the original manual page), send a mail to
Linux ACL March 23, 2002 Linux ACL