xref: /freebsd/usr.sbin/lptcontrol/lptcontrol.c (revision 0de89efe5c443f213c7ea28773ef2dc6cf3af2ed)
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 
31 #ifndef lint
32 static const char rcsid[] =
33 	"$Id$";
34 #endif /* not lint */
35 
36 #include <ctype.h>
37 #include <err.h>
38 #include <limits.h>
39 #include <paths.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44 
45 #include <machine/lpt.h>
46 #include <sys/file.h>
47 #include <sys/ioctl.h>
48 #include <sys/types.h>
49 
50 
51 #define PATH_LPCTL	_PATH_DEV "lpctl"
52 #define DEFAULT_UNIT	"0"
53 #define IRQ_INVALID	-1
54 #define DO_POLL		0
55 #define USE_IRQ		1
56 
57 static void usage()
58 {
59 	fprintf(stderr, "usage: lptcontrol -i | -p  [-u <unit no.>]\n");
60 	exit(1);
61 }
62 
63 static void set_interrupt_status(int irq_status, const char * file)
64 {
65 	int	fd;
66 
67 	if((fd = open(file, O_WRONLY, 0660)) < 0)
68 		err(1, "open");
69 	if(ioctl(fd, LPT_IRQ, &irq_status) < 0)
70 		err(1, "ioctl");
71 	close(fd);
72 }
73 
74 static char * dev_file(char unit_no)
75 {
76 	static char	devname[_POSIX_PATH_MAX+1];
77 	int		len;
78 
79 	strncpy(devname, PATH_LPCTL, _POSIX_PATH_MAX);
80 	devname[len = strlen(devname)] = unit_no;
81 	devname[++len] = '\0';
82 
83 	return(devname);
84 }
85 
86 int main (int argc, char * argv[])
87 {
88 	int		opt;
89 	int		irq_status = IRQ_INVALID;
90 	char		* unit = DEFAULT_UNIT;
91 
92 	while((opt = getopt(argc, argv, "ipu:")) != -1)
93 		switch(opt) {
94 		case 'i': irq_status = USE_IRQ; break;
95 		case 'p': irq_status = DO_POLL; break;
96 		case 'u': unit = optarg;
97 			  if(!isdigit(*unit))
98 				usage();
99 			  break;
100 		default : usage();
101 		}
102 	if(irq_status == IRQ_INVALID)
103 		usage();
104 
105 	set_interrupt_status(irq_status, dev_file(*unit));
106 
107 	exit(0);
108 }
109