Sat, 25 Apr 2020 20:31:31 +0200
Version 0.9.8. Added extra path to the fonts for Debian buster. Changed the PID to work on Proportional on Measurement. Added loops so that it looks like the PID is running at 100 mSec intervals.
/***************************************************************************** * 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 ThermFerm; see the file COPYING. If not, write to the Free * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *****************************************************************************/ #include "lock.h" #include "thermferm.h" /* * Put a lock on this program. */ int lockprog(char *name) { char *tempfile, *lockfile; FILE *fp; pid_t oldpid; tempfile = calloc(PATH_MAX, sizeof(char)); lockfile = calloc(PATH_MAX, sizeof(char)); snprintf(tempfile, PATH_MAX, "/var/run/%s.tmp", name); snprintf(lockfile, PATH_MAX, "/var/run/%s.pid", name); if ((fp = fopen(tempfile, "w")) == NULL) { perror(name); printf("Can't create lockfile \"%s\"\n", tempfile); free(tempfile); free(lockfile); return 1; } fprintf(fp, "%10u\n", getpid()); fclose(fp); while (TRUE) { if (link(tempfile, lockfile) == 0) { unlink(tempfile); free(tempfile); free(lockfile); return 0; } if ((fp = fopen(lockfile, "r")) == NULL) { perror(name); printf("Can't open lockfile \"%s\"\n", tempfile); unlink(tempfile); free(tempfile); free(lockfile); return 1; } if (fscanf(fp, "%u", &oldpid) != 1) { perror(name); printf("Can't read old pid from \"%s\"\n", tempfile); fclose(fp); unlink(tempfile); free(tempfile); free(lockfile); return 1; } fclose(fp); if (kill(oldpid,0) == -1) { if (errno == ESRCH) { printf("Stale lock found for pid %u\n", oldpid); unlink(lockfile); /* no return, try lock again */ } else { perror(name); printf("Kill for %u failed\n",oldpid); unlink(tempfile); free(tempfile); free(lockfile); return 1; } } else { printf("Another %s is already running, pid=%u\n", name, oldpid); unlink(tempfile); free(tempfile); free(lockfile); return 1; } } } void ulockprog(char *name) { char *lockfile; pid_t oldpid; FILE *fp; lockfile = calloc(PATH_MAX, sizeof(char)); snprintf(lockfile, PATH_MAX, "/var/run/%s.pid", name); if ((fp = fopen(lockfile, "r")) == NULL) { syslog(LOG_NOTICE, "Can't open lockfile \"%s\"", lockfile); free(lockfile); return; } if (fscanf(fp, "%u", &oldpid) != 1) { syslog(LOG_NOTICE, "Can't read old pid from \"%s\"", lockfile); fclose(fp); unlink(lockfile); free(lockfile); return; } fclose(fp); if (oldpid == getpid()) { (void)unlink(lockfile); } free(lockfile); }