FCHOWNAT(2) Linux Programmer's Manual FCHOWNAT(2)
fchownat - change ownership of a file relative to a directory file descriptor
#include <fcntl.h> /* Definition of AT_* constants */
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)):
Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10: _ATFILE_SOURCE
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 inter-
preted 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:
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
On success, fchownat() returns 0. On error, -1 is returned and errno is set to indicate
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.
pathname is relative and dirfd is a file descriptor referring to a file other than
fchownat() was added to Linux in kernel 2.6.16.
POSIX.1-2008. A similar system call exists on Solaris.
See openat(2) for an explanation of the need for fchownat().
chown(2), openat(2), path_resolution(7), symlink(7)
This page is part of release 3.25 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at http://www.ker-
Linux 2009-12-13 FCHOWNAT(2)