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23.Dd January 9, 2007
24.Dt FHOPEN 2
25.Os
26.Sh NAME
27.Nm fhopen
28.Nd open a file by file handle
29.Sh SYNOPSIS
30.Fd #include <sys/types.h>
31.Fd #include <sys/mount.h>
32.Ft int
33.Fn fhopen "const struct fhandle *fhp" "int flags"
34.Sh DESCRIPTION
35The file specified by the given file handle is opened for reading and/or
36writing, as specified by the argument
37.Fa flags ;
38the file descriptor is returned to the calling process.
39.Pp
40This system call is restricted to the super-user and is used by an
41NFS server's
42.Xr rpc.lockd 8
43daemon to open a file in order to perform locking operations on it.
44.Sh RETURN VALUES
45Upon successful completion, a value of 0 is returned.
46Otherwise, -1 is returned and the global variable
47.Va errno
48is set to indicate the error.
49.Sh ERRORS
50.Fn fhopen
51fails if one or more of the following are true:
52.Bl -tag -width Er
53.It Bq ESTALE
54The file handle no longer refers to a valid, NFS-exported object.
55.It Bq EPERM
56The caller is not the super-user.
57.It Bq EINVAL
58There was a problem with the value of one of the arguments.
59.It Bq EFAULT
60.Fa fhp
61points to an invalid address.
62.El
63.Sh SEE ALSO
64.Xr rpc.lockd 8