.\" @(#)getfd.3f 1.3 86/01/02 SMI; from UCB 4.2
.TH GETFD 3F "07 July 1995"
.SH NAME
getfd \- get the file descriptor of an external unit number
.SH SYNOPSIS
.\"
.IX getfd "" \fLgetfd\fP
.IX file "descriptor get getfd" "" "descriptor get: \&\fLgetfd\fP"
.IX get "file descriptor getfd" "" "file descriptor: \&\fLgetfd\fP"
.IX descriptor "file get getfd" "" "file get: \&\fLgetfd\fP"
.\"
.B integer function getfd(unitn)
.br
.B integer unitn
.SH DESCRIPTION
.B getfd
returns the file descriptor of an external unit number
if the unit is connected, and \-1 otherwise.
.SH FILES
.B libF77.a
.SH "SEE ALSO"
.BR open (2)