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ACL_EQUIV_MODE(3)	 BSD Library Functions Manual	     ACL_EQUIV_MODE(3)

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 argu‐
     ment 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⟩.

Linux ACL			March 23, 2002			     Linux ACL
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