ACL_VALID(3)            BSD Library Functions Manual            ACL_VALID(3)

NAME         top

     acl_valid — validate an ACL

LIBRARY         top

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

SYNOPSIS         top

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

     acl_valid(acl_t acl);

DESCRIPTION         top

     The acl_valid() function checks the ACL referred to by the argument acl
     for validity.

     The three required entries ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER
     must exist exactly once in the ACL. If the ACL contains any ACL_USER or
     ACL_GROUP entries, then an ACL_MASK entry is also required. The ACL may
     contain at most one ACL_MASK entry.

     The user identifiers must be unique among all entries of type ACL_USER.
     The group identifiers must be unique among all entries of type

RETURN VALUE         top

     The acl_valid() function returns the value 0 if successful; otherwise
     the value -1 is returned and the global variable errno is set to indi‐
     cate the error.

ERRORS         top

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

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

                        The argument acl does not point to a valid ACL.

                        One or more of the required ACL entries is not
                        present in acl.

                        The ACL contains entries that are not unique.

STANDARDS         top

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

SEE ALSO         top

     acl_check(3), acl_set_file(3), acl(5)

AUTHOR         top

     Derived from the FreeBSD manual pages written by Robert N M Watson
     <>, and adapted for Linux 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
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     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