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researchv10 Dan Cross

.ds ZZ DEVELOPMENT PACKAGE
.TH PRINTQ 3R "630 MTG"
.XE "printqempty()"
.XE "printqspace()"
.XE "printqclear()"
.SH NAME
printq: printqempty, printqspace, printqclear \- printer queue management
.SH SYNOPSIS
.B int printqempty ( )
.sp
.B int printqspace ( )
.sp
.B void printqclear ( )
.sp
.SH DESCRIPTION
Between terminal processes and the printer is a queue used
for buffering characters being sent to the printer.
The
.I printqempty
function
returns 1 if this queue is empty.
Otherwise, 0 is returned.
.P
The
.I printqspace
function
returns the number of characters that can be added to the queue before
it fills. A full buffer affects the way the
.I psendchar
function operates.
.P
The
.I printqclear
function
removes all the characters currently in the queue.
This prevents them from going to the printer.
This routine clears the queue only if the printer is owned.
.P
If the printer is not owned,
.I printqempty
returns 1 and
.I printqspace
returns 0.
.SH SEE ALSO
psendchar(3R), resources(3R).

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