.\" openfwtk project: lock_fd.3 1-Nov-2000
.TH lock_fd 3
.SH NAME
lock_fd(),lockun_fd(),locktest_fd() \- system-independant advisory lock interface.
.SH SYNOPSIS
.nf	
#include "fwfunc.h"
.fi
.sp 
int \fBlock_fd\fP(int f)
.sp
int \fBlockun_fd\fP(int f)
.sp
int \fBlocktest_fd\fP(int f)
.SH DESCRIPTION
\fIlock_fd\fP,\fIlockun_fd\fP and \fIlocktest_fd\fP functions do set, remove
and non-blocking set exclusive advisory locks on descriptor \fIf\fP. 
.SH RETURN VALUES
On success, zero is returned.  On error, -1  is  returned,
and errno is set appropriately.
.SH SEE ALSO
flock(2),lockf(3),fcntl(2)
.SH HISTORY
Functions were included in fwtk since 1.0