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 call‐
     ing acl_free(3) with the (void*)acl_t returned by acl_get_fd() as an

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 dis‐

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), 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 2017-03-13.  If you discover
     any rendering problems in this HTML version of the page, or you believe
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     corrections or improvements to the information in this COLOPHON (which
     is not part of the original manual page), send a mail to

Linux ACL                      March 23, 2002                      Linux ACL