lp/model/drain.output.c

	drain.output.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


#ident  "%Z%%M% %I% %E% SMI"    /* SVr4.0 1.5   */

#include "termio.h"

/*
 * The following macro computes the number of seconds to sleep
 * AFTER waiting for the system buffers to be drained.
 *
 * Various choices:
 *
 *  - A percentage (perhaps even >100%) of the time it would
 *    take to print the printer's buffer. Use this if it appears
 *    the printers are affected if the port is closed before they
 *    finish printing.
 *
 *  - 0. Use this to avoid any extra sleep after waiting for the
 *    system buffers to be flushed.
 *
 *  - N > 0. Use this to have a fixed sleep after flushing the
 *    system buffers.
 *
 * The sleep period can be overridden by a single command line argument.
 */
            /* 25% of the print-full-buffer time, plus 1 */
#define LONG_ENOUGH(BUFSZ,CPS)   (1 + ((250 * BUFSZ) / CPS) / 1000)

extern int      tidbit();

/**
 ** main()
 **/

int         main (argc, argv)
    int         argc;
    char            *argv[];
{
    extern char     *getenv();

    short           bufsz   = -1,
                cps = -1;

    char            *TERM;

    int         sleep_time  = 0;


    /*
     * Wait for the output to drain.
     */
    ioctl (1, TCSBRK, (struct termio *)1);

    /*
     * Decide how long to sleep.
     */
    if (argc != 2 || (sleep_time = atoi(argv[1])) < 0)
        if ((TERM = getenv("TERM"))) {
            tidbit (TERM, "bufsz", &bufsz);
            tidbit (TERM, "cps", &cps);
            if (cps > 0 && bufsz > 0)
                sleep_time = LONG_ENOUGH(bufsz, cps);
        } else
            sleep_time = 2;

    /*
     * Wait ``long enough'' for the printer to finish
     * printing what's in its buffer.
     */
    if (sleep_time)
        sleep (sleep_time);

    exit (0);
    /*NOTREACHED*/
}