lptcontrol.c revision 2471 
1/*
2 * Copyright (c) 1994 Geoffrey M. Rehmet
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *      This product includes software developed by Geoffrey M. Rehmet
16 * 4. The name of the author may not be used to endorse or promote products
17 *    derived from this software withough specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $Id: lptcontrol.c,v 1.2 1994/04/08 22:23:39 csgr Exp $
31 */
32
33#include <sys/types.h>
34#include <sys/file.h>
35#include <sys/ioctl.h>
36#include <machine/lpt.h>
37#include <stdlib.h>
38#include <unistd.h>
39#include <stdio.h>
40#include <string.h>
41#include <sys/errno.h>
42
43
44#define DEFAULT_LPT	"/dev/lpt0"
45#define IRQ_INVALID	-1
46#define DO_POLL		0
47#define USE_IRQ		1
48
49static char	default_printer[] = DEFAULT_LPT;
50
51static void usage(const char * progname)
52{
53	fprintf(stderr, "usage: %s -i | -p  [-f <file name>]\n", progname);
54	exit(1);
55}
56
57static void set_interrupt_status(int irq_status, const char * file)
58{
59	int	fd;
60
61	if((fd = open(file, O_WRONLY, 0660)) < 0) {
62		perror("open");
63		exit(1);
64	}
65	if(ioctl(fd, LPT_IRQ, &irq_status) < 0) {
66		perror("ioctl");
67		exit(1);
68	}
69	close(fd);
70}
71
72
73int main (int argc, char * argv[])
74{
75	int		opt;
76	int		irq_status = -1;
77	char		* file = default_printer;
78
79	while((opt = getopt(argc, argv, "pif:")) != -1)
80		switch(opt) {
81		case 'i': irq_status = USE_IRQ; break;
82		case 'p': irq_status = DO_POLL; break;
83		case 'f': file = optarg; break;
84		default : usage(argv[0]);
85		}
86	if(irq_status == IRQ_INVALID) usage(argv[0]);
87
88	set_interrupt_status(irq_status, file);
89
90	exit(0);
91}
92
93
94