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


SYNOPSIS

     int
     acl_calc_mask(acl_t *acl_p)


DESCRIPTION

     The acl_calc_mask() function calculates and sets the permissions associ­
     ated 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 permis­
     sions 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 work­
     ing 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
     tion.

     Any existing ACL entry descriptors that refer to entries in the ACL con­
     tinue 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.


RETURN VALUE

     The 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 error.


ERRORS

     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 mem­
                   ory required for an ACL_MASK ACL entry.


STANDARDS

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


SEE ALSO

     acl_check(3),  acl_get_entry(3),  acl_valid(3),  acl(5)


AUTHOR

     Derived from the FreeBSD manual pages written by Robert N M Watson
     <rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
     <a.gruenbacher@computer.org>.

 Linux ACL                      March 23, 2002                               1

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