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.\" $OpenBSD: getfh.2,v 1.13 2006/10/31 15:03:05 jmc Exp $
.\" $NetBSD: getfh.2,v 1.7 1995/10/12 15:40:53 jtc Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)getfh.2 8.1 (Berkeley) 6/9/93
.\"
.Dd June 9, 1993
.Dt GETFH 2
.Os
.Sh NAME
.Nm getfh
.Nd get file handle
.Sh SYNOPSIS
.Fd #include <sys/param.h>
.Fd #include <sys/mount.h>
.Ft int
.Fn getfh "const char *path" "fhandle_t *fhp"
.Sh DESCRIPTION
.Fn getfh
returns a file handle for the specified file or directory
.Fa path
in the file handle pointed to by
.Fa fhp .
This system call is restricted to the superuser.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, \-1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn getfh
fails if one or more of the following are true:
.Bl -tag -width Er
.It Bq ENOTDIR
A component of the path prefix of
.Fa path
is not a directory.
.It Bq ENAMETOOLONG
The length of a component of
.Fa path
exceeds
.Dv {NAME_MAX}
characters, or the length of
.Fa path
exceeds
.Dv {PATH_MAX}
characters.
.It Bq ENOENT
The file referred to by
.Fa path
does not exist.
.It Bq EACCES
Search permission is denied for a component of the path prefix of
.Fa path .
.It Bq ELOOP
Too many symbolic links were encountered in translating
.Fa path .
.It Bq EPERM
The effective user ID is not the superuser.
.It Bq EFAULT
.Fa fhp
or
.Fa path
points to an invalid address.
.It Bq EIO
An
.Tn I/O
error occurred while reading from or writing to the file system.
.It Bq EINVAL
A portion of
.Fa path
refers to a remote file system.
.It Bq EOPNOTSUPP
A portion of
.Fa path
refers to a remote file system.
.El
.Sh SEE ALSO
.Xr fhstat 2
.Sh HISTORY
The
.Fn getfh
function first appeared in
.Bx 4.4 .
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