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FCHOWNAT(2)                Linux Programmer's Manual               FCHOWNAT(2)



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

SYNOPSIS
       #define _ATFILE_SOURCE
       #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);

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.

       flags can either be 0, or include the following flag:

       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.

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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-08-21                       FCHOWNAT(2)