usr/src/cmd/lp/model/drain.output.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include "termio.h"
  33
  34 /*
  35  * The following macro computes the number of seconds to sleep
  36  * AFTER waiting for the system buffers to be drained.
  37  *
  38  * Various choices:
  39  *
  40  *      - A percentage (perhaps even >100%) of the time it would
  41  *        take to print the printer's buffer. Use this if it appears
  42  *        the printers are affected if the port is closed before they
  43  *        finish printing.
  44  *
  45  *      - 0. Use this to avoid any extra sleep after waiting for the
  46  *        system buffers to be flushed.
  47  *
  48  *      - N > 0. Use this to have a fixed sleep after flushing the
  49  *        system buffers.
  50  *
  51  * The sleep period can be overridden by a single command line argument.
  52  */
  53                         /* 25% of the print-full-buffer time, plus 1 */
  54 #define LONG_ENOUGH(BUFSZ,CPS)   (1 + ((250 * BUFSZ) / CPS) / 1000)
  55
  56 extern int              tidbit();
  57
  58 /**
  59  ** main()
  60  **/
  61
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         extern char             *getenv();
  66
  67         short                   bufsz   = -1,
  68                                 cps     = -1;
  69
  70         char                    *TERM;
  71
  72         int                     sleep_time      = 0;
  73
  74
  75         /*
  76          * Wait for the output to drain.
  77          */
  78         ioctl (1, TCSBRK, (struct termio *)1);
  79
  80         /*
  81          * Decide how long to sleep.
  82          */
  83         if (argc != 2 || (sleep_time = atoi(argv[1])) < 0)
  84                 if ((TERM = getenv("TERM"))) {
  85                         tidbit (TERM, "bufsz", &bufsz);
  86                         tidbit (TERM, "cps", &cps);
  87                         if (cps > 0 && bufsz > 0)
  88                                 sleep_time = LONG_ENOUGH(bufsz, cps);
  89                 } else
  90                         sleep_time = 2;
  91
  92         /*
  93          * Wait ``long enough'' for the printer to finish
  94          * printing what's in its buffer.
  95          */
  96         if (sleep_time)
  97                 sleep (sleep_time);
  98
  99         return (0);
 100 }