acl_from_mode(3) — Linux manual page


ACL_FROM_MODE(3)      BSD 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

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

     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

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