Mercurial > vordog

annotate vd_watchdog/vd_watchdog.c @ 9:b4f4a69ea86a v20080708

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clear error after event handler for watchdog(9)
author Thinker K.F. Li <thinker@branda.to>
date Tue, 08 Jul 2008 20:29:07 +0800
parents 5fa5e5199d1a
children
rev   line source
3
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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 <string.h>
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30 #include <fcntl.h>
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31 #include <sys/ioctl.h>
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32 #include <sys/types.h>
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33 #include <libgen.h>
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34 #include "vordog.h"
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35
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36 #define DEVNAME "/dev/vordog0"
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37 #define PROG prog
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38
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39 static int unit_factors[] = {0, 1, 60, 3600};
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40 static const char *prog = NULL;
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41
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42 static void
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43 watchdog(int timeout, int unit) {
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44 struct vordog_cfg cfg;
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45 int intval;
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46 int r;
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47 int fd;
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48
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49 fd = open(DEVNAME, O_RDWR);
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50 if(fd == -1) {
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51 perror(PROG);
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52 exit(1);
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53 }
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54
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55 cfg.init_val = timeout;
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56 cfg.unit = unit;
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57 r = ioctl(fd, VDCTL_ENABLE, &cfg);
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58 if(r == -1) {
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59 perror(PROG);
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60 exit(1);
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61 }
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62
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63 /* reset timer periodically */
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64 intval = timeout * unit_factors[unit];
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65 while(1) {
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66 sleep(intval);
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67 r = ioctl(fd, VDCTL_RESET);
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68 if(r == -1) {
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69 perror(PROG);
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70 exit(1);
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71 }
1
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72 }
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73 }
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74
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75 static void
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76 daemonize(void) {
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77 pid_t pid;
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78
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79 pid = fork();
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80 if(pid == -1) {
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81 perror("fork");
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82 exit(1);
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83 }
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84
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85 if(pid != 0)
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86 exit(0); /* parent */
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87
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88 /* child process */
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89 pid = setsid();
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90 if(pid == -1) {
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91 perror("setsid");
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92 exit(1);
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93 }
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94
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95 close(STDOUT_FILENO);
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96 close(STDOUT_FILENO);
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97 /* close(STDERR_FILENO); */
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98 }
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99
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100 static void
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101 usage(const char *prog) {
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102 fprintf(stderr, "Usage: %s [-msMH] <timeout>\n", prog);
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103 fprintf(stderr, "\t-s\tcount in seconds.\n");
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104 fprintf(stderr, "\t-M\tcount in minutes.\n");
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105 fprintf(stderr, "\t-m\tcount in hours.\n");
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106 fprintf(stderr,
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107 "\t<timeout> is interval between periodically reset of\n"
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108 "\t\twatchdog timer, or the system would be reseted without\n"
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109 "\t\treseting timer for 4 times. (default: 30s)\n"
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110 "\t\t(note: 1~255)\n");
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111 }
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112
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113
1
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114 static char *unit_names[] = {
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115 "* 4ms",
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116 "seconds",
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117 "minutes",
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118 "hours"
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119 };
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120
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121 int
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122 main(int argc, char * const argv[]) {
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123 int timeout, unit;
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124 int ch;
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125
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126 prog = basename(argv[0]); /* name of binary file. */
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127 prog = strdup(prog);
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128
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129 timeout = 30; /* default: 30s */
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130 unit = VDT_1S;
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131
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132 while((ch = getopt(argc, argv, "")) != -1) {
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133 switch(ch) {
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134 /* 4ms unit is not used for too short to sleep. */
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135 case 's':
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136 unit = VDT_1S;
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137 break;
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parents: 0
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138 case 'M':
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139 unit = VDT_1M;
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140 break;
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parents: 0
diff changeset
141 case 'H':
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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142 unit = VDT_1H;
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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143 break;
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parents: 0
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144 case '?':
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Thinker K.F. Li <thinker@branda.to>
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145 default:
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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146 usage(prog);
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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147 exit(1);
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parents: 0
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148 }
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parents: 0
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149 }
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parents: 0
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150 argc -= optind;
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parents: 0
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151 argv += optind;
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parents: 0
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152
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parents: 0
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153 if(argc != 1 && argc != 0) {
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parents: 0
diff changeset
154 usage(prog);
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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155 return 1;
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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156 }
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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157
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Thinker K.F. Li <thinker@branda.to>
parents: 0
diff changeset
158 if(argc == 1)
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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159 timeout = atoi(argv[0]);
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Thinker K.F. Li <thinker@branda.to>
parents: 0
diff changeset
160 if(timeout < 1 || timeout > 255) {
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Thinker K.F. Li <thinker@branda.to>
parents: 0
diff changeset
161 usage(prog);
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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162 return 1;
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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163 }
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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164
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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165 printf("Reset watchdog timer every %d %s\n",
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Thinker K.F. Li <thinker@branda.to>
parents: 0
diff changeset
166 timeout, unit_names[unit]);
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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167
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parents: 0
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168 daemonize();
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Thinker K.F. Li <thinker@branda.to>
parents: 0
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169 watchdog(timeout, unit);
4
5fa5e5199d1a use basename of binary file in messages.
Thinker K.F. Li <thinker@branda.to>
parents: 3
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170
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parents: 3
diff changeset
171 free((void *)prog);
0
71475f5afa92 Watchdog for Vortex86 6071 on FreeBSD
Thinker K.F. Li <thinker@branda.to>
parents:
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172 return 0;
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Thinker K.F. Li <thinker@branda.to>
parents:
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173 }