NAME

     acl_equiv_mode — check for an equivalent ACL

LIBRARY

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

SYNOPSIS

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

     int
     acl_equiv_mode(acl_t acl, mode_t *mode_p);

DESCRIPTION

     The acl_equiv_mode() function checks if the ACL pointed to by the argument acl contains only
     the required ACL entries of tag types ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER, and
     contains no permissions other that ACL_READ, ACL_WRITE or ACL_EXECUTE.  If the ACL has this
     form, it can can be fully represented with the traditional file permission bits, and is
     considered equivalent with the traditional file permission bits.

     If acl is an equivalent ACL and the pointer mode_p is not NULL, the value pointed to by
     mode_p is set to the value that defines the same owner, group and other permissions as
     contained in the ACL.

RETURN VALUE

     On success, this function returns the value 0 if acl is an equivalent ACL, and the value 1
     if acl is not an equivalent ACL. On error, the value -1 is returned, and errno is set
     appropriately.

ERRORS

     If any of the following conditions occur, the acl_equiv_mode() function returns the value -1
     and sets errno to the corresponding value:

     [EINVAL]           The argument acl is not a valid pointer to an ACL.

STANDARDS

     This is a non-portable, Linux specific extension to the ACL manipulation functions defined
     in IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned).

SEE ALSO

     acl_from_mode(3), acl(5)

AUTHOR

     Written by Andreas Gruenbacher <a.gruenbacher@bestbits.at>.