acl_get_entry(3) — Linux manual page


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 descriptors 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

                        The argument entry_id is neither ACL_NEXT_ENTRY
                        nor ACL_FIRST_ENTRY.

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 2021-08-27.  (At that
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Linux ACL                    March 23, 2002                    Linux ACL