acl_valid(3) — Linux manual page


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 ACL_GROUP.

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 indicate 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

                        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
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Linux ACL                    March 23, 2002                    Linux ACL