acl_cmp(3) — Linux manual page


ACL_CMP(3)              BSD Library Functions Manual              ACL_CMP(3)

NAME         top

     acl_cmp — compare two ACLs

LIBRARY         top

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

SYNOPSIS         top

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

     acl_cmp(acl_t acl1, acl_t acl2);

DESCRIPTION         top

     The acl_cmp() function compares the ACLs pointed to by the arguments
     acl1 and acl2 for equality. The two ACLs are considered equal if for
     each entry in acl1 there is an entry in acl2 with matching tag type,
     qualifier, and permissions, and vice versa.

RETURN VALUE         top

     If successful, the acl_cmp() function returns 0 if the two ACLs acl1
     and acl2 are equal, and 1 if they differ. Otherwise, the value -1 is
     returned and the global variable errno is set to indicate the error.

ERRORS         top

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

     [EINVAL]           The argument acl1 is not a valid pointer to an ACL.

                        The argument acl2 is not a valid pointer to an ACL.

STANDARDS         top

     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         top


AUTHOR         top

     Written by Andreas Gruenbacher <>.

COLOPHON         top

     This page is part of the acl (manipulating access control lists)
     project.  Information about the project can be found at  If you have a bug report for
     this manual page, see ⟨⟩.
     This page was obtained from the project's upstream Git repository
     ⟨git://⟩ on 2020-09-18.  (At that time,
     the date of the most recent commit that was found in the repository was
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Linux ACL                      March 23, 2002                      Linux ACL