thermferm/thermferm.c

/*****************************************************************************
 * 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 "thermferm.h"


int			current_unit = -1;
int			tempA = 80;
int			tempB = 80;

key_t			key = 5680;		/* key to be passed to shmget()		*/
int			shmid;

bool			my_shutdown = false;
static pid_t		pgrp, mypid;

extern bool		debug;
extern sys_config	Config;
#ifdef HAVE_WIRINGPI_H
extern int		lcdHandle;
extern unsigned char	lcdbuf[MAX_LCDS][20][4];
#endif
int			lcdupdate;


int  server(void);
void help(void);
void die(int);
#ifdef HAVE_WIRINGPI_H
void sendRCswitch(char *, int);
void stopLCD(void);
void stopRCswitch(void);
#endif


void help(void)
{
    fprintf(stdout, "mbsePi-apps thermferm v%s starting\n\n", VERSION);
    fprintf(stdout, "Usage: thermferm [-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);
    }

    my_shutdown = true;
}


#ifdef HAVE_WIRINGPI_H
void stopLCD(void)
{
    mb_lcdClear(lcdHandle);
    setBacklight(0);
}
#endif


int main(int argc, char *argv[])
{
    int		rc, c, i;
    pid_t	frk;
#ifdef HAVE_WIRINGPI_H
    char	buf[80];
#endif

    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("thermferm", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_USER);
    syslog(LOG_NOTICE, "mbsePi-apps thermferm v%s starting", VERSION);
    if (debug)
	fprintf(stdout, "mbsePi-apps thermferm v%s starting\n", VERSION);

    if (rdconfig((char *)"thermferm.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);
    }

#ifdef HAVE_WIRINGPI_H
    if (wiringPiSetup () )
	return 1;

    if ((rc = initLCD (16, 2))) {
	fprintf(stderr, "Cannot initialize LCD display, rc=%d\n", rc);
	return 1;
    }

    lcdPosition(lcdHandle, 0, 0);
    sprintf(buf, "    Thermferm");
    mb_lcdPuts(lcdHandle, buf);
    lcdPosition(lcdHandle, 0, 1);
    sprintf(buf, "  Version %s", VERSION);
    mb_lcdPuts(lcdHandle, buf);
#endif

    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");
#ifdef HAVE_WIRINGPI_H
			stopLCD();
#endif
			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];
    time_t		now, last = (time_t)0;
    w1_therm		*tmp1;
#ifdef HAVE_WIRINGPI_H
    int			rc;
#endif
    int			run = 1, temp;

    if (lockprog((char *)"thermferm")) {
	syslog(LOG_NOTICE, "Can't lock");
	return 1;
    }

#ifdef HAVE_WIRINGPI_H
    rc = piThreadCreate(my_sensors_loop);
    if (rc) {
	fprintf(stderr, "my_sensors_loop thread didn't start rc=%d\n", rc);
	syslog(LOG_NOTICE, "my_sensors_loop thread didn't start rc=%d", rc);
    }

    rc = piThreadCreate(my_server_loop);
    if (rc) {
	fprintf(stderr, "my_server_loop thread didn't start rc=%d\n", rc);
	syslog(LOG_NOTICE, "my_server_loop thread didn't start rc=%d", rc);
    }
#endif

    snprintf(buf, 1023, "tempA,tempB");
    logger((char *)"thermferm.log", (char *)"thermferm", buf);

    do {
	lcdupdate = FALSE;

	if (my_shutdown)
	    run = 0;

	tmp1 = Config.w1therms;
	if (tmp1->update) {
	    tmp1->update = FALSE;
	    lcdupdate = TRUE;
	}
	tmp1 = tmp1->next;
	if (tmp1->update) {
	    tmp1->update = FALSE;
	    lcdupdate = TRUE;
	}

#ifdef HAVE_WIRINGPI_H
	if (run && lcdupdate) {
	    lcdPosition(lcdHandle, 0, 0);
	    tmp1 = Config.w1therms;
	    snprintf(buf, 16, "%5.2f %cC %s              ", tmp1->lastval / 1000.0, 0xdf, tmp1->alias);
	    mb_lcdPuts(lcdHandle, buf);
	    temp = tmp1->lastval;
	    tmp1 = tmp1->next;
	    lcdPosition(lcdHandle, 0, 1);
	    snprintf(buf, 16, "%5.2f %cC %s              ", tmp1->lastval / 1000.0, 0xdf, tmp1->alias);
	    mb_lcdPuts(lcdHandle, buf);
	}
#endif

	now = time(NULL);
	if (((int)now - (int)last) > 60) {
	    last = now;
	    tmp1 = Config.w1therms;
	    temp = tmp1->lastval;
	    tmp1 = tmp1->next;
	    if (temp && tmp1->lastval && run) {
	    	snprintf(buf, 1023, "%.2f,%.2f", temp / 1000.0, tmp1->lastval / 1000.0);
	    	logger((char *)"thermferm.log", (char *)"thermferm", buf);
	    }
	}
	usleep(100000);

    } while (run);

    if (debug)
	fprintf(stdout, (char *)"Out of loop\n");

    /*
     * Give threads time to cleanup
     */
    usleep(1500000);

#ifdef HAVE_WIRINGPI_H
    stopLCD();
#endif

    wrconfig((char *)"thermferm.conf");

    ulockprog((char *)"thermferm");

    if (debug)
	fprintf(stdout, "Goodbye\n");

    return 0;
}