mirror of
https://github.com/eddyem/BTA_utils.git
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103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* This file is part of the btaprinthdr 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/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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#include <usefull_macros.h>
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#include "cmdlnopts.h"
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#include "bta_print.h"
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#include "bta_shdata.h"
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static pid_t childpid;
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static glob_pars *G = NULL;
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void signals(int signo){
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signal(signo, SIG_IGN);
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if(childpid){ // master process
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if(signo == SIGUSR1){ // kill child
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kill(childpid, signo);
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signal(signo, signals);
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return;
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}
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WARNX("Master killed with sig=%d", signo);
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if(G && G->pidfile) unlink(G->pidfile);
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}
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exit(signo);
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}
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int main(int argc, char **argv){
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char *self = strdup(argv[0]);
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initial_setup();
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G = parse_args(argc, argv);
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if(!G->outfile){
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ERRX("Point output file name");
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}
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if(G->refresh < 0.1 || G->refresh > 30.){
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ERRX("Refresh rate should be from 0.1 to 30 seconds");
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}
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FILE *f = fopen(G->outfile, "w");
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if(!f) ERRX("Can't create file %s", G->outfile);
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fclose(f); unlink(G->outfile);
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check4running(self, G->pidfile);
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signal(SIGINT, signals);
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signal(SIGQUIT, signals);
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signal(SIGABRT, signals);
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signal(SIGTERM, signals);
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signal(SIGHUP, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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signal(SIGUSR1, signals);
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#ifndef EBUG
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unsigned int pause = 5;
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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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wait(NULL);
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if(dtime() - t0 < 1.) pause += 5;
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else pause = 1;
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if(pause > 900) pause = 900;
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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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#endif
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if(!get_shm_block(&sdat, ClientSide)){
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ERRX("BTA daemon isn't running?");
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}
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unsigned s = (unsigned)G->refresh;
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useconds_t us = (G->refresh - s)* 1e6;
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while(1){
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if(!check_shm_block(&sdat)) return 1;
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print_header(G->outfile);
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if(s) sleep(s);
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usleep(us);
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}
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return 0;
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}
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