acl_set_fd(3) — Linux manual page


ACL_SET_FD(3)            Library Functions Manual          ACL_SET_FD(3)

NAME         top

       acl_set_fd — set an ACL by file descriptor

LIBRARY         top

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

SYNOPSIS         top

       <sys/types.h> <sys/acl.h> int acl_set_fd(int fd, acl_t acl)

DESCRIPTION         top

       The acl_set_fd() function associates an access ACL with the file
       referred to by fd.

       The effective user ID of the process must match the owner of the
       file or the process must have the CAP_FOWNER capability for the
       request to succeed.

RETURN VALUE         top

       The acl_set_fd() function returns the value 0 if successful;
       otherwise the value -1 is returned and the global variable errno
       is set to indicate the error.

ERRORS         top

       If any of the following conditions occur, the acl_set_fd()
       function returns the value -1 and and sets errno to the
       corresponding value:

       [EBADF]            The fd argument is not a valid file

       [EINVAL]           The argument acl does not point to a valid

                          The ACL has more entries than the file
                          referred to by fd can obtain.

       [ENOSPC]           The directory or file system that would
                          contain the new ACL cannot be extended or the
                          file system is out of file allocation

       [ENOTSUP]          The file identified by fd cannot be associated
                          with the ACL because the file system on which
                          the file is located does not support this.

       [EPERM]            The process does not have appropriate
                          privilege to perform the operation to set the

       [EROFS]            This function requires modification of a file
                          system which is currently read-only.

STANDARDS         top

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

SEE ALSO         top

       acl_delete_def_file(3), acl_get_file(3), acl_set_file(3),
       acl_valid(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 2023-12-22.  (At that
       time, the date of the most recent commit that was found in the
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       (which is not part of the original manual page), send a mail to

Linux ACL                    March 23, 2002                ACL_SET_FD(3)