1 /*
2  * Copyright (c) 1995
3  *	Mark Murray.  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  *
14  * THIS SOFTWARE IS PROVIDED BY MARK MURRAY AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD: src/usr.sbin/rndcontrol/rndcontrol.c,v 1.11.2.1 2000/05/10 02:04:44 obrien Exp $
27  * $DragonFly: src/usr.sbin/rndcontrol/rndcontrol.c,v 1.4 2005/12/05 02:40:28 swildner Exp $
28  */
29 
30 #include <sys/random.h>
31 #include <err.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <unistd.h>
35 #include <fcntl.h>
36 #include <errno.h>
37 #include <sys/ioctl.h>
38 
39 static void
40 usage(void)
41 {
42 	fprintf(stderr, "usage: rndcontrol [-q] [-s irq_no] [-c irq_no]\n");
43 	exit(1);
44 }
45 
46 int
47 main(int argc, char *argv[])
48 {
49 	int verbose, ch, fd, result, i;
50 	u_int16_t irq;
51 
52 	verbose = 1;
53 
54 	fd = open("/dev/random", O_RDONLY, 0);
55 	if (fd == -1) {
56 		warn("/dev/random");
57 		return (1);
58 	}
59 	else {
60 		while ((ch = getopt(argc, argv, "qs:c:")) != -1)
61 			switch (ch) {
62 			case 'q':
63 				verbose = 0;
64 				break;
65 			case 's':
66 				irq = (u_int16_t)atoi(optarg);
67 				if (verbose)
68 					printf("%s: setting irq %d\n", argv[0], irq);
69 				result = ioctl(fd, MEM_SETIRQ, (char *)&irq);
70 				if (result == -1) {
71 					warn("%s", argv[0]);
72 					return (1);
73 				}
74 				break;
75 			case 'c':
76 				irq = (u_int16_t)atoi(optarg);
77 				if (verbose)
78 					printf("%s: clearing irq %d\n", argv[0], irq);
79 				result = ioctl(fd, MEM_CLEARIRQ, (char *)&irq);
80 				if (result == -1) {
81 					warn("%s", argv[0]);
82 					return (1);
83 				}
84 				break;
85 			case '?':
86 			default:
87 				usage();
88 			}
89 		}
90 		if (verbose) {
91 			printf("%s: interrupts in use:", argv[0]);
92 			irq = 0;
93 			for (;;) {
94 			    result = ioctl(fd, MEM_FINDIRQ, (char *)&irq);
95 			    if (result < 0)
96 				break;
97 			    printf(" %d", irq);
98 			    ++irq;
99 			}
100 			if (result < 0 && errno == ENOTSUP) {
101 			    printf(" unknown");
102 			}
103 			printf("\n");
104 		}
105 		argc -= optind;
106 		argv += optind;
107 
108 		if (argc) {
109 			fprintf(stderr, "%s: unknown argument(s): ", argv[-optind]);
110 			for (i = 0; i < argc; i++)
111 				fprintf(stderr, " %s", argv[i]);
112 			fprintf(stderr, "\n");
113 		}
114 
115 	return 0;
116 }
117