Wed, 18 Oct 2023 10:06:11 +0200
Version 0.3.45. Removed all writing to ascii logfiles in the webserver environment, only log to MySQL.
/***************************************************************************** * Copyright (C) 2017-2021 * * Michiel Broek <mbroek at mbse dot eu> * * This file is part of the bms (Brewery Management System) * * 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. * * bms 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 "bms.h" #include "futil.h" extern char *Private_Path; /* * 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, "%s/run/%s.tmp", Private_Path, name); snprintf(lockfile, PATH_MAX, "%s/run/%s.pid", Private_Path, name); if (mkdirs(tempfile, 0755) == false) { syslog(LOG_NOTICE, "Can't create path `%s': %s", tempfile, strerror(errno)); free(tempfile); free(lockfile); return 1; } if ((fp = fopen(tempfile, "w")) == NULL) { syslog(LOG_NOTICE, "Can't create lockfile `%s': %s", tempfile, strerror(errno)); free(tempfile); free(lockfile); return 1; } fprintf(fp, "%u\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) { syslog(LOG_NOTICE, "Can't open lockfile `%s': %s", tempfile, strerror(errno)); unlink(tempfile); free(tempfile); free(lockfile); return 1; } if (fscanf(fp, "%u", &oldpid) != 1) { syslog(LOG_NOTICE, "Can't read old pid from `%s'", tempfile); fclose(fp); unlink(tempfile); free(tempfile); free(lockfile); return 1; } fclose(fp); if (kill(oldpid,0) == -1) { if (errno == ESRCH || errno == EPERM) { syslog(LOG_NOTICE, "Stale lock found for pid %u, try lock again", oldpid); unlink(lockfile); /* no return, try lock again */ } else { syslog(LOG_NOTICE, "Kill for %u failed: %s",oldpid, strerror(errno)); unlink(tempfile); free(tempfile); free(lockfile); return 1; } } else { syslog(LOG_NOTICE, "Another %s is already running, pid=%u", 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, "%s/run/%s.pid", Private_Path, name); if ((fp = fopen(lockfile, "r")) == NULL) { syslog(LOG_NOTICE, "Can't open lockfile `%s': %s", lockfile, strerror(errno)); 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); }