NAME

       fchownat - change ownership of a file relative to a directory file descriptor

SYNOPSIS

       #include <fcntl.h> /* Definition of AT_* constants */
       #include <unistd.h>

       int fchownat(int dirfd, const char *pathname,
                    uid_t owner, gid_t group, int flags);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fchownat():
           Since glibc 2.10:
               _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _ATFILE_SOURCE

DESCRIPTION

       The  fchownat()  system  call operates in exactly the same way as chown(2), except for the
       differences described in this manual page.

       If the pathname given in pathname is relative, then it  is  interpreted  relative  to  the
       directory  referred  to  by the file descriptor dirfd (rather than relative to the current
       working directory of the calling process, as is done by chown(2) for a relative pathname).

       If pathname is relative and  dirfd  is  the  special  value  AT_FDCWD,  then  pathname  is
       interpreted  relative  to  the  current  working  directory  of  the calling process (like
       chown(2)).

       If pathname is absolute, then dirfd is ignored.

       The flags argument is a bit mask created by ORing together 0  or  more  of  the  following
       values;

       AT_EMPTY_PATH (since Linux 2.6.39)
              If pathname is an empty string, operate on the file referred to by dirfd (which may
              have been obtained using the open(2) O_PATH flag).  In this case, dirfd  can  refer
              to any type of file, not just a directory.

       AT_SYMLINK_NOFOLLOW
              If  pathname is a symbolic link, do not dereference it: instead operate on the link
              itself, like lchown(2).  (By default, fchownat() dereferences symbolic links,  like
              chown(2).)

RETURN VALUE

       On  success,  fchownat() returns 0.  On error, -1 is returned and errno is set to indicate
       the error.

ERRORS

       The same errors that occur for chown(2) can also  occur  for  fchownat().   The  following
       additional errors can occur for fchownat():

       EBADF  dirfd is not a valid file descriptor.

       EINVAL Invalid flag specified in flags.

       ENOTDIR
              pathname  is relative and dirfd is a file descriptor referring to a file other than
              a directory.

VERSIONS

       fchownat() was added to Linux in kernel 2.6.16; library support  was  added  to  glibc  in
       version 2.4.

CONFORMING TO

       POSIX.1-2008.  A similar system call exists on Solaris.

NOTES

       See openat(2) for an explanation of the need for fchownat().

SEE ALSO

       chown(2), openat(2), path_resolution(7), symlink(7)

COLOPHON

       This  page  is  part of release 3.54 of the Linux man-pages project.  A description of the
       project,    and    information    about    reporting    bugs,    can    be    found     at
       http://www.kernel.org/doc/man-pages/.