Tue, 06 May 2014 13:24:25 +0200
Sensor reading is done in a thread
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1 | /***************************************************************************** |
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2 | * Copyright (C) 2014 |
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3 | * |
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4 | * Michiel Broek <mbroek at mbse dot eu> |
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5 | * |
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6 | * This file is part of the mbsePi-apps |
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7 | * |
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8 | * This is free software; you can redistribute it and/or modify it |
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9 | * under the terms of the GNU General Public License as published by the |
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10 | * Free Software Foundation; either version 2, or (at your option) any |
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11 | * later version. |
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12 | * |
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13 | * mbsePi-apps is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with EC-65K; see the file COPYING. If not, write to the Free |
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20 | * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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21 | *****************************************************************************/ |
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22 | |
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23 | #include "../lib/mbselib.h" |
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24 | #include "coolers.h" |
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25 | #include "mosquitto.h" |
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26 | #include "sensors.h" |
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27 | |
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28 | #ifdef HAVE_WIRINGPI_H |
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29 | |
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30 | |
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31 | bool shutdown = false; |
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32 | static pid_t pgrp, mypid; |
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33 | |
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34 | extern bool debug; |
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35 | extern sys_config Config; |
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36 | extern int lcdHandle; |
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37 | int lcdupdate; |
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38 | |
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39 | int server(void); |
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40 | void help(void); |
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41 | void die(int); |
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42 | |
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43 | |
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44 | void help(void) |
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45 | { |
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46 | fprintf(stdout, "mbsePi-apps coolers v%s starting\n\n", VERSION); |
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47 | fprintf(stdout, "Usage: coolers [-d] [-h]\n"); |
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48 | fprintf(stdout, " -d --debug Debug and run in foreground\n"); |
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49 | fprintf(stdout, " -h --help Display this help\n"); |
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50 | } |
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51 | |
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52 | |
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53 | |
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54 | void die(int onsig) |
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55 | { |
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56 | switch (onsig) { |
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57 | case SIGHUP: syslog(LOG_NOTICE, "Got SIGHUP, shutting down"); |
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58 | break; |
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59 | case SIGINT: syslog(LOG_NOTICE, "Keyboard interrupt, shutting down"); |
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60 | break; |
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61 | case SIGTERM: syslog(LOG_NOTICE, "Got SIGTERM, shutting down"); |
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62 | break; |
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63 | default: syslog(LOG_NOTICE, "die() on signal %d", onsig); |
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64 | } |
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65 | |
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66 | shutdown = true; |
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67 | } |
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68 | |
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69 | |
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70 | |
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71 | void stopLCD(void) |
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72 | { |
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73 | lcdClear(lcdHandle); |
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74 | setBacklight(0); |
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75 | } |
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76 | |
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77 | |
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78 | |
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79 | int main(int argc, char *argv[]) |
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80 | { |
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81 | int rc, c, i; |
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82 | pid_t frk; |
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83 | char buf[80]; |
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84 | |
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85 | while (1) { |
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86 | int option_index = 0; |
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87 | static struct option long_options[] = { |
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88 | {"debug", 0, 0, 'c'}, |
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89 | {"help", 0, 0, 'h'}, |
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90 | {0, 0, 0, 0} |
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91 | }; |
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92 | |
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93 | c = getopt_long(argc, argv, "dh", long_options, &option_index); |
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94 | if (c == -1) |
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95 | break; |
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96 | |
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97 | switch (c) { |
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98 | case 'd': debug = true; |
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99 | break; |
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100 | case 'h': help(); |
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101 | return 1; |
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102 | } |
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103 | } |
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104 | |
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105 | openlog("coolers", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_USER); |
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106 | syslog(LOG_NOTICE, "mbsePi-apps coolers v%s starting", VERSION); |
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107 | if (debug) |
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108 | fprintf(stdout, "mbsePi-apps coolers v%s starting\n", VERSION); |
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109 | |
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110 | if (rdconfig((char *)"coolers.conf")) { |
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111 | fprintf(stderr, "Error reading configuration\n"); |
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112 | syslog(LOG_NOTICE, "halted"); |
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113 | return 1; |
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114 | } |
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115 | |
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116 | /* |
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117 | * Catch all the signals we can, and ignore the rest. Note that SIGKILL can't be ignored |
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118 | * but that's live. This daemon should only be stopped by SIGTERM. |
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119 | * Don't catch SIGCHLD. |
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120 | */ |
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121 | for (i = 0; i < NSIG; i++) { |
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122 | if ((i != SIGCHLD) && (i != SIGKILL) && (i != SIGSTOP)) |
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123 | signal(i, (void (*))die); |
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124 | } |
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125 | |
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126 | if ((rc = initLCD (16, 2))) { |
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127 | fprintf(stderr, "Cannot initialize LCD display, rc=%d\n", rc); |
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128 | return 1; |
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129 | } |
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130 | |
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131 | lcdPosition(lcdHandle, 0, 0); |
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132 | lcdPuts(lcdHandle, "Coolers"); |
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133 | lcdPosition(lcdHandle, 0, 1); |
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134 | sprintf(buf, "Version %s", VERSION); |
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135 | lcdPuts(lcdHandle, buf); |
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136 | |
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137 | if (debug) { |
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138 | /* |
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139 | * For debugging run in foreground. |
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140 | */ |
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141 | rc = server(); |
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142 | } else { |
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143 | /* |
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144 | * Server initialization is complete. Now we can fork the |
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145 | * daemon and return to the user. We need to do a setpgrp |
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146 | * so that the daemon will no longer be assosiated with the |
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147 | * users control terminal. This is done before the fork, so |
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148 | * that the child will not be a process group leader. Otherwise, |
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149 | * if the child were to open a terminal, it would become |
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150 | * associated with that terminal as its control terminal. |
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151 | */ |
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152 | if ((pgrp = setpgid(0, 0)) == -1) { |
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153 | syslog(LOG_NOTICE, "setpgpid failed"); |
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154 | } |
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155 | |
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156 | frk = fork(); |
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157 | switch (frk) { |
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158 | case -1: |
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159 | syslog(LOG_NOTICE, "Daemon fork failed: %s", strerror(errno)); |
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160 | syslog(LOG_NOTICE, "Finished, rc=1"); |
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161 | stopLCD(); |
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162 | exit(1); |
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163 | case 0: /* |
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164 | * Run the daemon |
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165 | */ |
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166 | fclose(stdin); |
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167 | if (open("/dev/null", O_RDONLY) != 0) { |
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168 | syslog(LOG_NOTICE, "Reopen of stdin to /dev/null failed"); |
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169 | _exit(2); |
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170 | } |
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171 | fclose(stdout); |
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172 | if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 1) { |
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173 | syslog(LOG_NOTICE, "Reopen of stdout to /dev/null failed"); |
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174 | _exit(2); |
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175 | } |
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176 | fclose(stderr); |
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177 | if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 2) { |
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178 | syslog(LOG_NOTICE, "Reopen of stderr to /dev/null failed"); |
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179 | _exit(2); |
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180 | } |
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181 | mypid = getpid(); |
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182 | rc = server(); |
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183 | break; |
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184 | /* Not reached */ |
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185 | default: |
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186 | /* |
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187 | * Here we detach this process and let the child |
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188 | * run the deamon process. |
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189 | */ |
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190 | syslog(LOG_NOTICE, "Starting daemon with pid %d", frk); |
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191 | exit(0); |
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192 | } |
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193 | } |
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194 | |
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195 | syslog(LOG_NOTICE, "Finished, rc=%d", rc); |
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196 | return rc; |
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197 | } |
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198 | |
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199 | |
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200 | |
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201 | int server(void) |
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202 | { |
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203 | char buf[1024]; |
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204 | w1_therm *tmp1, *old1; |
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205 | int rc, run = 0; |
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206 | |
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207 | my_mosquitto_init(); |
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208 | |
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209 | rc = piThreadCreate (my_sensors_loop); |
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210 | if (rc) { |
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211 | fprintf(stderr, "my_sensors_loop thread didn't start\n"); |
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212 | } else { |
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213 | if (debug) |
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214 | fprintf(stdout, "Thread my_sensors_loop started\n"); |
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215 | } |
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216 | |
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217 | do { |
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218 | lcdupdate = FALSE; |
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219 | |
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220 | run = my_mosquitto_loop(); |
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221 | |
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222 | if (run && lcdupdate) { |
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223 | lcdPosition(lcdHandle, 0, 0); |
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224 | tmp1 = Config.w1therms; |
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225 | snprintf(buf, 16, "%4.1f %cC %c %s ", tmp1->lastval / 1000.0, 0xdf, ' ', tmp1->alias); |
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226 | lcdPuts(lcdHandle, buf); |
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227 | old1 = tmp1->next; |
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228 | tmp1 = old1; |
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229 | lcdPosition(lcdHandle, 0, 1); |
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230 | snprintf(buf, 16, "%4.1f %cC %c %s ", tmp1->lastval / 1000.0, 0xdf, ' ', tmp1->alias); |
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231 | lcdPuts(lcdHandle, buf); |
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232 | } |
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233 | |
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234 | } while (run); |
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235 | |
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236 | if (debug) |
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237 | fprintf(stdout, (char *)"Out of loop\n"); |
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238 | |
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239 | my_mosquitto_exit(); |
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240 | stopLCD(); |
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241 | |
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242 | return 0; |
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243 | } |
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244 | |
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245 | #else |
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246 | |
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247 | |
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248 | int main(int argc, char *argv[]) |
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249 | { |
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250 | fprintf(stderr, "Compiled on a system without a wiringPi library.\n"); |
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251 | fprintf(stderr, "This program is useless and will do nothing.\n"); |
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252 | return 0; |
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253 | } |
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254 | |
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255 | |
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256 | #endif |