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annotate vd_watchdog/vd_watchdog.c @ 3:60a234c9c03f

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Add 2-clause BSD license
author Thinker K.F. Li <thinker@branda.to>
date Tue, 08 Jul 2008 12:13:58 +0800
parents 89e9d591748d
children 5fa5e5199d1a
rev   line source
3
60a234c9c03f Add 2-clause BSD license
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1 /*-
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2 * Copyright (c) 2008 Kueifong Li <thinker@branda.to>.
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3 * All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
60a234c9c03f Add 2-clause BSD license
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6 * modification, are permitted provided that the following conditions
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7 * are met:
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 *
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14 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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15 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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16 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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24 * POSSIBILITY OF SUCH DAMAGE.
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25 */
0
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26 #include <stdio.h>
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27 #include <stdlib.h>
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28 #include <unistd.h>
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29 #include <fcntl.h>
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30 #include <sys/ioctl.h>
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31 #include <sys/types.h>
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32 #include "vordog.h"
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33
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34 #define DEVNAME "/dev/vordog0"
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35 #define PROG "vd_watchdog"
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36
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37 static int unit_factors[] = {0, 1, 60, 3600};
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38
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39 static void
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40 watchdog(int timeout, int unit) {
0
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41 struct vordog_cfg cfg;
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42 int intval;
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43 int r;
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44 int fd;
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45
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46 fd = open(DEVNAME, O_RDWR);
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47 if(fd == -1) {
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48 perror(PROG);
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49 exit(1);
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50 }
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51
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52 cfg.init_val = timeout;
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53 cfg.unit = unit;
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54 r = ioctl(fd, VDCTL_ENABLE, &cfg);
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55 if(r == -1) {
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56 perror(PROG);
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57 exit(1);
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58 }
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59
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60 /* reset timer periodically */
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61 intval = timeout * unit_factors[unit];
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62 while(1) {
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63 sleep(intval);
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64 r = ioctl(fd, VDCTL_RESET);
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65 if(r == -1) {
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66 perror(PROG);
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67 exit(1);
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68 }
1
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69 }
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70 }
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71
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72 static void
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73 daemonize(void) {
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74 pid_t pid;
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75
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76 pid = fork();
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77 if(pid == -1) {
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78 perror("fork");
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79 exit(1);
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80 }
1
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81
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82 if(pid != 0)
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83 exit(0); /* parent */
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84
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85 /* child process */
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86 pid = setsid();
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87 if(pid == -1) {
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88 perror("setsid");
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89 exit(1);
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90 }
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91
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92 close(STDOUT_FILENO);
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93 close(STDOUT_FILENO);
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94 /* close(STDERR_FILENO); */
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95 }
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96
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97 static void
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98 usage(const char *prog) {
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99 fprintf(stderr, "Usage: %s [-msMH] <timeout>\n", prog);
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100 fprintf(stderr, "\t-s\tcount in seconds.\n");
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101 fprintf(stderr, "\t-M\tcount in minutes.\n");
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102 fprintf(stderr, "\t-m\tcount in hours.\n");
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103 fprintf(stderr,
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104 "\t<timeout> is interval between periodically reset of\n"
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105 "\t\twatchdog timer, or the system would be reseted without\n"
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106 "\t\treseting timer for 4 times. (default: 30s)\n"
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107 "\t\t(note: 1~255)\n");
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108 }
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109
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110
1
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111 static char *unit_names[] = {
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112 "* 4ms",
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113 "seconds",
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114 "minutes",
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115 "hours"
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116 };
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117
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118 int
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119 main(int argc, char * const argv[]) {
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120 int timeout, unit;
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121 int ch;
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122 const char *prog = argv[0];
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123
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124 timeout = 30; /* default: 30s */
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125 unit = VDT_1S;
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126
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127 while((ch = getopt(argc, argv, "")) != -1) {
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128 switch(ch) {
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129 /* 4ms unit is not used for too short to sleep. */
1
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130 case 's':
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131 unit = VDT_1S;
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132 break;
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133 case 'M':
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134 unit = VDT_1M;
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135 break;
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136 case 'H':
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137 unit = VDT_1H;
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138 break;
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139 case '?':
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140 default:
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141 usage(prog);
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142 exit(1);
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143 }
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144 }
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145 argc -= optind;
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146 argv += optind;
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147
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148 if(argc != 1 && argc != 0) {
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149 usage(prog);
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150 return 1;
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151 }
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152
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153 if(argc == 1)
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154 timeout = atoi(argv[0]);
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155 if(timeout < 1 || timeout > 255) {
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156 usage(prog);
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157 return 1;
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158 }
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159
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160 printf("Reset watchdog timer every %d %s\n",
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161 timeout, unit_names[unit]);
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162
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163 daemonize();
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164 watchdog(timeout, unit);
0
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165 return 0;
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166 }