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.\"	@(#)getfh.2	8.1 (Berkeley) 6/9/93
.\"
.Dd January 9, 2007
.Dt GETFH 2
.Os
.Sh NAME
.Nm getfh
.Nd get file handle
.Sh SYNOPSIS
.Fd #include <sys/types.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
in the file handle pointed to by
.Fa fhp .
This system call is restricted to the super-user and is used by an
NFS server's
.Xr nfsd 8
daemon to obtain file handles used in NFS MOUNT service replies.
.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 EPERM
The caller is not the super-user.
.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 EFAULT
.Fa Fhp
points to an invalid address.
.It Bq EIO
An
.Tn I/O
error occurred while reading from or writing to the file system.
.El
.Sh SEE ALSO
.Xr nfsd 8
.Sh HISTORY
The
.Fn getfh
function first appeared in 4.4BSD.