Tue, 06 May 2014 13:24:25 +0200
Sensor reading is done in a thread
/***************************************************************************** * Copyright (C) 2014 * * Michiel Broek <mbroek at mbse dot eu> * * This file is part of the mbsePi-apps * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * mbsePi-apps is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with EC-65K; see the file COPYING. If not, write to the Free * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *****************************************************************************/ #include "../lib/mbselib.h" #include "coolers.h" #include "mosquitto.h" #include "sensors.h" #ifdef HAVE_WIRINGPI_H bool shutdown = false; static pid_t pgrp, mypid; extern bool debug; extern sys_config Config; extern int lcdHandle; int lcdupdate; int server(void); void help(void); void die(int); void help(void) { fprintf(stdout, "mbsePi-apps coolers v%s starting\n\n", VERSION); fprintf(stdout, "Usage: coolers [-d] [-h]\n"); fprintf(stdout, " -d --debug Debug and run in foreground\n"); fprintf(stdout, " -h --help Display this help\n"); } void die(int onsig) { switch (onsig) { case SIGHUP: syslog(LOG_NOTICE, "Got SIGHUP, shutting down"); break; case SIGINT: syslog(LOG_NOTICE, "Keyboard interrupt, shutting down"); break; case SIGTERM: syslog(LOG_NOTICE, "Got SIGTERM, shutting down"); break; default: syslog(LOG_NOTICE, "die() on signal %d", onsig); } shutdown = true; } void stopLCD(void) { lcdClear(lcdHandle); setBacklight(0); } int main(int argc, char *argv[]) { int rc, c, i; pid_t frk; char buf[80]; while (1) { int option_index = 0; static struct option long_options[] = { {"debug", 0, 0, 'c'}, {"help", 0, 0, 'h'}, {0, 0, 0, 0} }; c = getopt_long(argc, argv, "dh", long_options, &option_index); if (c == -1) break; switch (c) { case 'd': debug = true; break; case 'h': help(); return 1; } } openlog("coolers", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_USER); syslog(LOG_NOTICE, "mbsePi-apps coolers v%s starting", VERSION); if (debug) fprintf(stdout, "mbsePi-apps coolers v%s starting\n", VERSION); if (rdconfig((char *)"coolers.conf")) { fprintf(stderr, "Error reading configuration\n"); syslog(LOG_NOTICE, "halted"); return 1; } /* * Catch all the signals we can, and ignore the rest. Note that SIGKILL can't be ignored * but that's live. This daemon should only be stopped by SIGTERM. * Don't catch SIGCHLD. */ for (i = 0; i < NSIG; i++) { if ((i != SIGCHLD) && (i != SIGKILL) && (i != SIGSTOP)) signal(i, (void (*))die); } if ((rc = initLCD (16, 2))) { fprintf(stderr, "Cannot initialize LCD display, rc=%d\n", rc); return 1; } lcdPosition(lcdHandle, 0, 0); lcdPuts(lcdHandle, "Coolers"); lcdPosition(lcdHandle, 0, 1); sprintf(buf, "Version %s", VERSION); lcdPuts(lcdHandle, buf); if (debug) { /* * For debugging run in foreground. */ rc = server(); } else { /* * Server initialization is complete. Now we can fork the * daemon and return to the user. We need to do a setpgrp * so that the daemon will no longer be assosiated with the * users control terminal. This is done before the fork, so * that the child will not be a process group leader. Otherwise, * if the child were to open a terminal, it would become * associated with that terminal as its control terminal. */ if ((pgrp = setpgid(0, 0)) == -1) { syslog(LOG_NOTICE, "setpgpid failed"); } frk = fork(); switch (frk) { case -1: syslog(LOG_NOTICE, "Daemon fork failed: %s", strerror(errno)); syslog(LOG_NOTICE, "Finished, rc=1"); stopLCD(); exit(1); case 0: /* * Run the daemon */ fclose(stdin); if (open("/dev/null", O_RDONLY) != 0) { syslog(LOG_NOTICE, "Reopen of stdin to /dev/null failed"); _exit(2); } fclose(stdout); if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 1) { syslog(LOG_NOTICE, "Reopen of stdout to /dev/null failed"); _exit(2); } fclose(stderr); if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 2) { syslog(LOG_NOTICE, "Reopen of stderr to /dev/null failed"); _exit(2); } mypid = getpid(); rc = server(); break; /* Not reached */ default: /* * Here we detach this process and let the child * run the deamon process. */ syslog(LOG_NOTICE, "Starting daemon with pid %d", frk); exit(0); } } syslog(LOG_NOTICE, "Finished, rc=%d", rc); return rc; } int server(void) { char buf[1024]; w1_therm *tmp1, *old1; int rc, run = 0; my_mosquitto_init(); rc = piThreadCreate (my_sensors_loop); if (rc) { fprintf(stderr, "my_sensors_loop thread didn't start\n"); } else { if (debug) fprintf(stdout, "Thread my_sensors_loop started\n"); } do { lcdupdate = FALSE; run = my_mosquitto_loop(); if (run && lcdupdate) { lcdPosition(lcdHandle, 0, 0); tmp1 = Config.w1therms; snprintf(buf, 16, "%4.1f %cC %c %s ", tmp1->lastval / 1000.0, 0xdf, ' ', tmp1->alias); lcdPuts(lcdHandle, buf); old1 = tmp1->next; tmp1 = old1; lcdPosition(lcdHandle, 0, 1); snprintf(buf, 16, "%4.1f %cC %c %s ", tmp1->lastval / 1000.0, 0xdf, ' ', tmp1->alias); lcdPuts(lcdHandle, buf); } } while (run); if (debug) fprintf(stdout, (char *)"Out of loop\n"); my_mosquitto_exit(); stopLCD(); return 0; } #else int main(int argc, char *argv[]) { fprintf(stderr, "Compiled on a system without a wiringPi library.\n"); fprintf(stderr, "This program is useless and will do nothing.\n"); return 0; } #endif