usr.sbin/rndcontrol/rndcontrol.c

   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 }