acl_from_mode(3) — Linux manual page


ACL_FROM_MODE(3)         Library Functions Manual       ACL_FROM_MODE(3)

NAME         top

       acl_from_mode — create an ACL from file permission bits

LIBRARY         top

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

SYNOPSIS         top

       <sys/types.h> <acl/libacl.h> acl_t acl_from_mode(mode_t mode)

DESCRIPTION         top

       The acl_from_mode() function creates a minimal ACL that contains
       the three entries with tag types ACL_USER_OBJ, ACL_GROUP_OBJ, and
       ACL_OTHER, with permissions corresponding to the owner, group,
       and other permission bits of its argument mode.

RETURN VALUE         top

       On success, this function returns a pointer to the working
       storage. On error, a value of (acl_t)NULL is returned, and errno
       is set appropriately.

ERRORS         top

       If any of the following conditions occur, the acl_from_mode()
       function returns a value of (acl_t)NULL and sets errno to the
       corresponding value:

       [ENOMEM]           The ACL working storage requires more memory
                          than is allowed by the hardware or system-
                          imposed memory management constraints.

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

       acl_equiv_mode(3), acl_get_file(3), acl(5)

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
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       ⟨git://⟩ on 2023-12-22.  (At that
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Linux ACL                    March 23, 2002             ACL_FROM_MODE(3)