ACL_GET_ENTRY(3)        BSD Library Functions Manual        ACL_GET_ENTRY(3)

NAME         top

     acl_get_entry — get an ACL entry

LIBRARY         top

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

SYNOPSIS         top

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

     acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p);

DESCRIPTION         top

     The acl_get_entry() function obtains a descriptor for an ACL entry as
     specified by entry_id within the ACL indicated by the argument acl.  If
     the value of entry_id is ACL_FIRST_ENTRY, then the function returns in
     entry_p a descriptor for the first ACL entry within acl.  If the value
     of entry_id is ACL_NEXT_ENTRY, then the function returns in entry_p a
     descriptor for the next ACL entry within acl.

     If a call is made to acl_get_entry() with entry_id set to
     ACL_NEXT_ENTRY when there has not been either an initial successful
     call to acl_get_entry(), or a previous successful call to
     acl_get_entry() following a call to acl_calc_mask(), acl_copy_int(),
     acl_create_entry(), acl_delete_entry(), acl_dup(), acl_from_text(),
     acl_get_fd(), acl_get_file(), acl_set_fd(), acl_set_file(), or
     acl_valid(), then the effect is unspecified.

     Calls to acl_get_entry() do not modify any ACL entries. Subsequent
     operations using the returned ACL entry descriptor operate on the ACL
     entry within the ACL in working storage. The order of all existing
     entries in the ACL remains unchanged.  Any existing ACL entry descrip‐
     tors that refer to entries within the ACL continue to refer to those
     entries. Any existing ACL pointers that refer to the ACL referred to by
     acl continue to refer to the ACL.

RETURN VALUE         top

     If the function successfully obtains an ACL entry, the function returns
     a value of 1.  If the ACL has no ACL entries, the function returns the
     value 0.  If the value of entry_id is ACL_NEXT_ENTRY and the last ACL
     entry in the ACL has already been returned by a previous call to
     acl_get_entry(), the function returns the value 0 until a successful
     call with an entry_id of ACL_FIRST_ENTRY is made. Otherwise, the value
     -1 is returned and errno is set to indicate the error.

ERRORS         top

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

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

                        The argument entry_id is neither ACL_NEXT_ENTRY nor

STANDARDS         top

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

SEE ALSO         top

     acl_calc_mask(3), acl_create_entry(3), acl_copy_entry(3),
     acl_delete_entry(3), acl_get_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
     this manual page, see ⟨⟩.
     This page was obtained from the project's upstream Git repository
     ⟨git://⟩ on 2018-10-29.  (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