acl_calc_mask

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ACL_CALC_MASK(3)	 BSD Library Functions Manual	     ACL_CALC_MASK(3)

NAME
     acl_calc_mask - calculate the file group class mask

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

SYNOPSIS
     #include <sys/types.h>
     #include <sys/acl.h>

     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
     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-
     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; other-
     wise 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 memory 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			    Linux ACL