Print to terminal

print-to-terminal.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>

#define FIFO_FILE "/tmp/veri.log"
#define TERM_EMU_CMD "xterm -e 'cat /tmp/veri.log'"

volatile int running = 1;

void ctrlc_handler(int unused)
{
    running = 0;
}

int main(void)
{
    signal(SIGINT, ctrlc_handler);

    if (access(FIFO_FILE, W_OK) != 0) {
        if (mkfifo(FIFO_FILE, 0666) != 0) {
            printf("Make fifo error\n");
            return -1;
        }
    }

    switch(fork()) {
    case -1:
        printf("Fork error\n");
        remove(FIFO_FILE);
        return -1;

    case 0:
        execl("/bin/sh", "sh", "-c", TERM_EMU_CMD, (char*)NULL);
        return 0;
    }

    FILE *f = fopen(FIFO_FILE, "a");

    for (int n = 0; (n < 1000) && running; n ++) {
        fprintf(f, "Fork: N = %i\n", n);
        fflush(f);

        printf("Main: N = %i\n", n);
        sleep(1);
    }

    fclose(f);
    remove(FIFO_FILE);

    return 0;
}