Mercurial > mbsePi-apps / file comparison
comparison: thermometers/thermometers.c
thermometers/thermometers.c
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- ee8f851b4d93
- parent 406
- 44566f986f76
- child 408
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| 1 /***************************************************************************** | |
| 2 * Copyright (C) 2014 | |
| 3 * | |
| 4 * Michiel Broek <mbroek at mbse dot eu> | |
| 5 * | |
| 6 * This file is part of the mbsePi-apps | |
| 7 * | |
| 8 * This is free software; you can redistribute it and/or modify it | |
| 9 * under the terms of the GNU General Public License as published by the | |
| 10 * Free Software Foundation; either version 2, or (at your option) any | |
| 11 * later version. | |
| 12 * | |
| 13 * mbsePi-apps is distributed in the hope that it will be useful, but | |
| 14 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 * General Public License for more details. | |
| 17 * | |
| 18 * You should have received a copy of the GNU General Public License | |
| 19 * along with EC-65K; see the file COPYING. If not, write to the Free | |
| 20 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
| 21 *****************************************************************************/ | |
| 22 | |
| 23 #include "thermometers.h" | |
| 24 | |
| 25 | |
| 26 static int my_shutdown = FALSE; | |
| 27 static pid_t pgrp, mypid; | |
| 28 | |
| 29 extern int debug; | |
| 30 extern sys_config Config; | |
| 31 #ifdef HAVE_WIRINGPI_H | |
| 32 extern int lcdHandle; | |
| 33 #endif | |
| 34 | |
| 35 int server(void); | |
| 36 void help(void); | |
| 37 void die(int); | |
| 38 | |
| 39 | |
| 40 void help(void) | |
| 41 { | |
| 42 fprintf(stdout, "mbsePi-apps thermometers v%s starting\n\n", VERSION); | |
| 43 fprintf(stdout, "Usage: thermomeneters [-d] [-h]\n"); | |
| 44 fprintf(stdout, " -d --debug Debug and run in foreground\n"); | |
| 45 fprintf(stdout, " -h --help Display this help\n"); | |
| 46 } | |
| 47 | |
| 48 | |
| 49 | |
| 50 void die(int onsig) | |
| 51 { | |
| 52 switch (onsig) { | |
| 53 case SIGHUP: syslog(LOG_NOTICE, "Got SIGHUP, shutting down"); | |
| 54 break; | |
| 55 case SIGINT: syslog(LOG_NOTICE, "Keyboard interrupt, shutting down"); | |
| 56 break; | |
| 57 case SIGTERM: syslog(LOG_NOTICE, "Got SIGTERM, shutting down"); | |
| 58 break; | |
| 59 default: syslog(LOG_NOTICE, "die() on signal %d", onsig); | |
| 60 } | |
| 61 | |
| 62 my_shutdown = TRUE; | |
| 63 } | |
| 64 | |
| 65 | |
| 66 | |
| 67 #ifdef HAVE_WIRINGPI_H | |
| 68 void stopLCD(void) | |
| 69 { | |
| 70 lcdClear(lcdHandle); | |
| 71 setBacklight(0); | |
| 72 } | |
| 73 #endif | |
| 74 | |
| 75 | |
| 76 | |
| 77 int main(int argc, char *argv[]) | |
| 78 { | |
| 79 int rc, c, i; | |
| 80 pid_t frk; | |
| 81 #ifdef HAVE_WIRINGPI_H | |
| 82 char buf[80]; | |
| 83 #endif | |
| 84 | |
| 85 while (1) { | |
| 86 int option_index = 0; | |
| 87 static struct option long_options[] = { | |
| 88 {"debug", 0, 0, 'c'}, | |
| 89 {"help", 0, 0, 'h'}, | |
| 90 {0, 0, 0, 0} | |
| 91 }; | |
| 92 | |
| 93 c = getopt_long(argc, argv, "dh", long_options, &option_index); | |
| 94 if (c == -1) | |
| 95 break; | |
| 96 | |
| 97 switch (c) { | |
| 98 case 'd': debug = TRUE; | |
| 99 break; | |
| 100 case 'h': help(); | |
| 101 return 1; | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 openlog("thermometers", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_USER); | |
| 106 syslog(LOG_NOTICE, "mbsePi-apps thermometers v%s starting", VERSION); | |
| 107 if (debug) | |
| 108 fprintf(stdout, "mbsePi-apps thermometers v%s starting\n", VERSION); | |
| 109 | |
| 110 if (rdconfig((char *)"thermometers.conf")) { | |
| 111 fprintf(stderr, "Error reading configuration\n"); | |
| 112 syslog(LOG_NOTICE, "Error reading configuration, halted"); | |
| 113 return 1; | |
| 114 } | |
| 115 | |
| 116 /* | |
| 117 * Catch all the signals we can, and ignore the rest. Note that SIGKILL can't be ignored | |
| 118 * but that's live. This daemon should only be stopped by SIGTERM. | |
| 119 * Don't catch SIGCHLD. | |
| 120 */ | |
| 121 for (i = 0; i < NSIG; i++) { | |
| 122 if ((i != SIGCHLD) && (i != SIGKILL) && (i != SIGSTOP)) | |
| 123 signal(i, (void (*))die); | |
| 124 } | |
| 125 | |
| 126 #ifdef HAVE_WIRINGPI_H | |
| 127 | |
| 128 if (wiringPiSetup () ) | |
| 129 return 1; | |
| 130 | |
| 131 if ((rc = initLCD (16, 2))) { | |
| 132 fprintf(stderr, "Cannot initialize LCD display, rc=%d\n", rc); | |
| 133 return 1; | |
| 134 } | |
| 135 | |
| 136 lcdPosition(lcdHandle, 0, 0); | |
| 137 lcdPuts(lcdHandle, "Thermometers"); | |
| 138 lcdPosition(lcdHandle, 0, 1); | |
| 139 sprintf(buf, "Version %s", VERSION); | |
| 140 lcdPuts(lcdHandle, buf); | |
| 141 #endif | |
| 142 | |
| 143 if (debug) { | |
| 144 /* | |
| 145 * For debugging run in foreground. | |
| 146 */ | |
| 147 rc = server(); | |
| 148 } else { | |
| 149 /* | |
| 150 * Server initialization is complete. Now we can fork the | |
| 151 * daemon and return to the user. We need to do a setpgrp | |
| 152 * so that the daemon will no longer be assosiated with the | |
| 153 * users control terminal. This is done before the fork, so | |
| 154 * that the child will not be a process group leader. Otherwise, | |
| 155 * if the child were to open a terminal, it would become | |
| 156 * associated with that terminal as its control terminal. | |
| 157 */ | |
| 158 if ((pgrp = setpgid(0, 0)) == -1) { | |
| 159 syslog(LOG_NOTICE, "setpgpid failed"); | |
| 160 } | |
| 161 | |
| 162 frk = fork(); | |
| 163 switch (frk) { | |
| 164 case -1: | |
| 165 syslog(LOG_NOTICE, "Daemon fork failed: %s", strerror(errno)); | |
| 166 syslog(LOG_NOTICE, "Finished, rc=1"); | |
| 167 #ifdef HAVE_WIRINGPI_H | |
| 168 stopLCD(); | |
| 169 #endif | |
| 170 exit(1); | |
| 171 case 0: /* | |
| 172 * Run the daemon | |
| 173 */ | |
| 174 fclose(stdin); | |
| 175 if (open("/dev/null", O_RDONLY) != 0) { | |
| 176 syslog(LOG_NOTICE, "Reopen of stdin to /dev/null failed"); | |
| 177 _exit(2); | |
| 178 } | |
| 179 fclose(stdout); | |
| 180 if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 1) { | |
| 181 syslog(LOG_NOTICE, "Reopen of stdout to /dev/null failed"); | |
| 182 _exit(2); | |
| 183 } | |
| 184 fclose(stderr); | |
| 185 if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 2) { | |
| 186 syslog(LOG_NOTICE, "Reopen of stderr to /dev/null failed"); | |
| 187 _exit(2); | |
| 188 } | |
| 189 mypid = getpid(); | |
| 190 rc = server(); | |
| 191 break; | |
| 192 /* Not reached */ | |
| 193 default: | |
| 194 /* | |
| 195 * Here we detach this process and let the child | |
| 196 * run the deamon process. | |
| 197 */ | |
| 198 syslog(LOG_NOTICE, "Starting daemon with pid %d", frk); | |
| 199 exit(0); | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 syslog(LOG_NOTICE, "Finished, rc=%d", rc); | |
| 204 return rc; | |
| 205 } | |
| 206 | |
| 207 | |
| 208 | |
| 209 int server(void) | |
| 210 { | |
| 211 int temp, rc = 0; | |
| 212 #ifdef HAVE_WIRINGPI_H | |
| 213 char buf[1024]; | |
| 214 int lcdupdate; | |
| 215 #endif | |
| 216 w1_therm *tmp1; | |
| 217 char *device, line[60], *p = NULL; | |
| 218 FILE *fp; | |
| 219 | |
| 220 if (debug) | |
| 221 fprintf(stdout, (char *)"Enter loop\n"); | |
| 222 | |
| 223 do { | |
| 224 #ifdef HAVE_WIRINGPI_H | |
| 225 lcdupdate = FALSE; | |
| 226 #endif | |
| 227 | |
| 228 /* | |
| 229 * Here send our 1-wire sensors values | |
| 230 */ | |
| 231 for (tmp1 = Config.w1therms; tmp1; tmp1 = tmp1->next) { | |
| 232 | |
| 233 /* | |
| 234 * Build path and alias topic | |
| 235 */ | |
| 236 device = xstrcpy((char *)"/sys/bus/w1/devices/"); | |
| 237 device = xstrcat(device, tmp1->master); | |
| 238 device = xstrcat(device, (char *)"/"); | |
| 239 device = xstrcat(device, tmp1->name); | |
| 240 device = xstrcat(device, (char *)"/w1_slave"); | |
| 241 | |
| 242 /* | |
| 243 * Read sensor data | |
| 244 */ | |
| 245 if ((fp = fopen(device, "r"))) { | |
| 246 /* | |
| 247 * The output looks like: | |
| 248 * 72 01 4b 46 7f ff 0e 10 57 : crc=57 YES | |
| 249 * 72 01 4b 46 7f ff 0e 10 57 t=23125 | |
| 250 */ | |
| 251 fgets(line, 50, fp); | |
| 252 line[strlen(line)-1] = '\0'; | |
| 253 if ((line[36] == 'Y') && (line[37] == 'E')) { | |
| 254 /* | |
| 255 * CRC is Ok, continue | |
| 256 */ | |
| 257 fgets(line, 50, fp); | |
| 258 line[strlen(line)-1] = '\0'; | |
| 259 strtok(line, (char *)"="); | |
| 260 p = strtok(NULL, (char *)"="); | |
| 261 rc = sscanf(p, "%d", &temp); | |
| 262 if ((rc == 1) && (tmp1->lastval != temp)) { | |
| 263 tmp1->lastval = temp; | |
| 264 #ifdef HAVE_WIRINGPI_H | |
| 265 lcdupdate = TRUE; | |
| 266 #endif | |
| 267 } | |
| 268 } else { | |
| 269 syslog(LOG_NOTICE, "sensor %s/%s CRC error", tmp1->master, tmp1->name); | |
| 270 } | |
| 271 fclose(fp); | |
| 272 tmp1->present = 1; | |
| 273 } else { | |
| 274 tmp1->present = 0; | |
| 275 if (debug) | |
| 276 printf("sensor %s is missing\n", tmp1->name); | |
| 277 } | |
| 278 | |
| 279 free(device); | |
| 280 device = NULL; | |
| 281 } | |
| 282 | |
| 283 #ifdef HAVE_WIRINGPI_H | |
| 284 if (lcdupdate) { | |
| 285 lcdPosition(lcdHandle, 0, 0); | |
| 286 tmp1 = Config.w1therms; | |
| 287 snprintf(buf, 16, "%5.1f %cC %s ", tmp1->lastval / 1000.0, 0xdf, tmp1->alias); | |
| 288 lcdPuts(lcdHandle, buf); | |
| 289 tmp1 = tmp1->next; | |
| 290 lcdPosition(lcdHandle, 0, 1); | |
| 291 snprintf(buf, 16, "%5.1f %cC %s ", tmp1->lastval / 1000.0, 0xdf, tmp1->alias); | |
| 292 lcdPuts(lcdHandle, buf); | |
| 293 } | |
| 294 #endif | |
| 295 | |
| 296 if (my_shutdown) { | |
| 297 #ifdef HAVE_WIRINGPI_H | |
| 298 lcdClear(lcdHandle); | |
| 299 lcdPosition(lcdHandle, 0, 0); | |
| 300 lcdPuts(lcdHandle, "Shuting down ..."); | |
| 301 #endif | |
| 302 } | |
| 303 | |
| 304 usleep(100000); | |
| 305 | |
| 306 } while (! my_shutdown); | |
| 307 | |
| 308 if (debug) | |
| 309 fprintf(stdout, (char *)"Out of loop\n"); | |
| 310 | |
| 311 #ifdef HAVE_WIRINGPI_H | |
| 312 stopLCD(); | |
| 313 #endif | |
| 314 | |
| 315 return rc; | |
| 316 } | |
| 317 |
