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, fchow- nat() 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 information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

Linux 2008-08-21 FCHOWNAT(2)