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https://github.com/eddyem/eddys_snippets.git
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108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/*
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* This file is part of the canserver project.
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* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <usefull_macros.h>
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#include "cmdlnopts.h"
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#include "sersock.h"
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static TTY_descr *dev = NULL;
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static pid_t childpid = 0;
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int server = 1;
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void signals(int sig){
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if(childpid){ // slave process
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DBG("Child killed with sig=%d", sig);
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LOGWARN("Child killed with sig=%d", sig);
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exit(sig);
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}
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// master process
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DBG("Master process");
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if(!server) restore_console();
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else if(dev) close_tty(&dev);
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if(sig){
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DBG("Exit with signal %d", sig);
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signal(sig, SIG_IGN);
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LOGERR("Exit with signal %d", sig);
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}else LOGERR("Exit");
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if(GP->pidfile && server){
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DBG("Unlink pid file");
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unlink(GP->pidfile);
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}
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exit(sig);
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}
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int main(int argc, char **argv){
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initial_setup();
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parse_args(argc, argv);
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if(GP->logfile){
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int lvl = LOGLEVEL_WARN + GP->verbose;
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DBG("level = %d", lvl);
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if(lvl > LOGLEVEL_ANY) lvl = LOGLEVEL_ANY;
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verbose(1, "Log file %s @ level %d\n", GP->logfile, lvl);
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OPENLOG(GP->logfile, lvl, 1);
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if(!globlog) WARNX("Can't create log file");
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}
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if(GP->client) server = 0;
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else if(!GP->devpath){
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LOGERR("You should point serial device path");
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ERRX("You should point serial device path");
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}
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/* int port = atoi(GP->port);
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if(port < 1024 || port > 65535){
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LOGERR("Wrong port value: %d", port);
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WARNX("Wrong port value: %d", port);
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return 1;
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}*/
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if(server) check4running(NULL, GP->pidfile);
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// signal reactions:
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signal(SIGTERM, signals); // kill (-15) - quit
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signal(SIGHUP, SIG_IGN); // hup - ignore
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signal(SIGINT, signals); // ctrl+C - quit
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signal(SIGQUIT, signals); // ctrl+\ - quit
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signal(SIGTSTP, SIG_IGN); // ignore ctrl+Z
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LOGMSG("Started");
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#ifndef EBUG
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if(server){
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unsigned int pause = 1;
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while(1){
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childpid = fork();
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if(childpid){ // master
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double t0 = dtime();
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LOGMSG("Created child with pid %d", childpid);
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wait(NULL);
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LOGWARN("Child %d died", childpid);
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if(dtime() - t0 < 1.) ++pause;
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else pause = 1;
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if(pause > 30) pause = 30;
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sleep(pause); // wait a little before respawn
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}else{ // slave
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prctl(PR_SET_PDEATHSIG, SIGTERM); // send SIGTERM to child when parent dies
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break;
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}
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}
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}
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#endif
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return start_socket(server, GP->path, &dev);
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}
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