acl_get_fd(3) — Linux manual page


ACL_GET_FD(3)         BSD Library Functions Manual         ACL_GET_FD(3)

NAME         top

     acl_get_fd — get an ACL by file descriptor

LIBRARY         top

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

SYNOPSIS         top

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

     acl_get_fd(int fd);

DESCRIPTION         top

     The acl_get_fd() function retrieves the access ACL associated with
     the file referred to by fd.  The ACL is placed into working storage
     and acl_get_fd() returns a pointer to that storage.

     In order to read an ACL from an object, a process must have read
     access to the object's attributes.

     This function may cause memory to be allocated.  The caller should
     free any releasable memory, when the new ACL is no longer required,
     by calling acl_free(3) with the (void*)acl_t returned by
     acl_get_fd() as an argument.

RETURN VALUE         top

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

ERRORS         top

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

     [EBADF]            The fd argument is not a valid file descriptor.

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

     [ENOTSUP]          The file system on which the file identified by
                        fd is located does not support ACLs, or ACLs are

STANDARDS         top

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

SEE ALSO         top

     acl_free(3), acl_get_entry(3), acl_get_file(3), acl_set_fd(3),

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
     time, the date of the most recent commit that was found in the
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     in this HTML version of the page, or you believe there is a better
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Linux ACL                    March 23, 2002                    Linux ACL