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.TH FSTATAT 2 2006-04-30 "Linux 2.6.16" "Linux Programmer's Manual"
.SH NAME
fstatat \- get file status relative to a directory file descriptor
.SH SYNOPSIS
.nf
.B #define _ATFILE_SOURCE
.B #include <sys/stat.h>
.sp
.BI "int fstatat(int " dirfd ", const char *" pathname ", struct stat *" \
buf ,
.BI "            int " flags );
.fi
.SH DESCRIPTION
The
.BR fstatat ()
system call operates in exactly the same way as
.BR stat (2),
except for the differences described in this manual page.

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

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

If
.IR pathname
is absolute, then
.I dirfd
is ignored.

.I flags
can either be 0, or include the following flag:
.TP
.B AT_SYMLINK_NOFOLLOW
If
.I pathname
is a symbolic link, do not dereference it:
instead return information about the link itself, like
.BR lstat (2).
(By default,
.BR fstatat ()
dereferences symbolic links, like
.BR stat (2).)
.SH "RETURN VALUE"
On success,
.BR fstatat ()
returns 0.
On error, \-1 is returned and
.I errno
is set to indicate the error.
.SH ERRORS
The same errors that occur for
.BR stat (2)
can also occur for
.BR fstatat ().
The following additional errors can occur for
.BR fstatat ():
.TP
.B EBADF
.I dirfd
is not a valid file descriptor.
.TP
.B EINVAL
Invalid flag specified in
.IR flags .
.TP
.B ENOTDIR
.I pathname
is relative and
.I dirfd
is a file descriptor referring to a file other than a directory.
.SH NOTES
See
.BR openat (2)
for an explanation of the need for
.BR fstatat ().
.SH "CONFORMING TO"
This system call is non-standard but is proposed
for inclusion in a future revision of POSIX.1.
A similar system call exists on Solaris.
.SH VERSIONS
.BR fstatat ()
was added to Linux in kernel 2.6.16.
.SH "SEE ALSO"
.BR openat (2),
.BR path_resolution (2),
.BR stat (2)