linux man page for fchownat

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

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.

       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 3.27 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/.

Linux								    2009-12-13							       FCHOWNAT(2)