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annotate vd_watchdog/vd_watchdog.c @ 2:89e9d591748d

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Fix bug of usage for vd_watchdog, and add Makefile
author Thinker K.F. Li <thinker@branda.to>
date Tue, 08 Jul 2008 11:17:01 +0800
parents 0b9854adb86c
children 60a234c9c03f
rev   line source
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <fcntl.h>
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5 #include <sys/ioctl.h>
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6 #include <sys/types.h>
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7 #include "vordog.h"
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8
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9 #define DEVNAME "/dev/vordog0"
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10 #define PROG "vd_watchdog"
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11
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12 static int unit_factors[] = {0, 1, 60, 3600};
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13
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14 static void
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15 watchdog(int timeout, int unit) {
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16 struct vordog_cfg cfg;
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17 int intval;
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18 int r;
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19 int fd;
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20
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21 fd = open(DEVNAME, O_RDWR);
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22 if(fd == -1) {
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23 perror(PROG);
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24 exit(1);
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25 }
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26
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27 cfg.init_val = timeout;
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28 cfg.unit = unit;
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29 r = ioctl(fd, VDCTL_ENABLE, &cfg);
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30 if(r == -1) {
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31 perror(PROG);
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32 exit(1);
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33 }
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34
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35 /* reset timer periodically */
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36 intval = timeout * unit_factors[unit];
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37 while(1) {
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38 sleep(intval);
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39 r = ioctl(fd, VDCTL_RESET);
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40 if(r == -1) {
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41 perror(PROG);
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42 exit(1);
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43 }
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44 }
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45 }
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46
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47 static void
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48 daemonize(void) {
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49 pid_t pid;
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50
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51 pid = fork();
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52 if(pid == -1) {
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53 perror("fork");
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54 exit(1);
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55 }
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56
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57 if(pid != 0)
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58 exit(0); /* parent */
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59
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60 /* child process */
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61 pid = setsid();
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62 if(pid == -1) {
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63 perror("setsid");
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64 exit(1);
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65 }
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66
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67 close(STDOUT_FILENO);
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68 close(STDOUT_FILENO);
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69 /* close(STDERR_FILENO); */
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70 }
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71
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72 static void
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73 usage(const char *prog) {
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74 fprintf(stderr, "Usage: %s [-msMH] <timeout>\n", prog);
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75 fprintf(stderr, "\t-s\tcount in seconds.\n");
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76 fprintf(stderr, "\t-M\tcount in minutes.\n");
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77 fprintf(stderr, "\t-m\tcount in hours.\n");
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78 fprintf(stderr,
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79 "\t<timeout> is interval between periodically reset of\n"
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80 "\t\twatchdog timer, or the system would be reseted without\n"
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81 "\t\treseting timer for 4 times. (default: 30s)\n"
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82 "\t\t(note: 1~255)\n");
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83 }
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84
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85
1
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86 static char *unit_names[] = {
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87 "* 4ms",
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88 "seconds",
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89 "minutes",
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90 "hours"
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91 };
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92
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93 int
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94 main(int argc, char * const argv[]) {
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95 int timeout, unit;
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96 int ch;
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97 const char *prog = argv[0];
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98
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99 timeout = 30; /* default: 30s */
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100 unit = VDT_1S;
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101
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102 while((ch = getopt(argc, argv, "")) != -1) {
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103 switch(ch) {
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104 case 's':
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105 unit = VDT_1S;
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106 break;
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107 case 'M':
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108 unit = VDT_1M;
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109 break;
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110 case 'H':
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111 unit = VDT_1H;
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112 break;
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113 case '?':
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114 default:
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115 usage(prog);
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116 exit(1);
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117 }
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118 }
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119 argc -= optind;
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120 argv += optind;
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121
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122 if(argc != 1 && argc != 0) {
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123 usage(prog);
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124 return 1;
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125 }
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126
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127 if(argc == 1)
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128 timeout = atoi(argv[0]);
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129 if(timeout < 1 || timeout > 255) {
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130 usage(prog);
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131 return 1;
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132 }
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133
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134 printf("Reset watchdog timer every %d %s\n",
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135 timeout, unit_names[unit]);
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136
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137 daemonize();
0b9854adb86c Remove tedious messages and daemonize vd_watchdog.
Thinker K.F. Li <thinker@branda.to>
parents: 0
diff changeset
138 watchdog(timeout, unit);
0
71475f5afa92 Watchdog for Vortex86 6071 on FreeBSD
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
139 return 0;
71475f5afa92 Watchdog for Vortex86 6071 on FreeBSD
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
140 }