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#define _POSIX_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>

int fd, P1;
 
void handler(int signum)
{
    char buff[151], c;
    size_t i;
    for (i = 0; (c = getc(fd)) != EOF; i++) {
        buff[i] = c;
    }
    buff[i+1] = '\0';
 
    write(P1, buff, strlen(buff));
}
 
int main(int argc, char *argv[])
{
    fd = open("p1.txt", O_RDONLY);
    (void)signal(SIGUSR1, handler);
    P1 = atoi(argv[1]);
 
    const char* textmsg = "P1 SA HLASI KU SLUZBE!";
    printf("%s\n", textmsg);
 
    kill(getppid(), SIGUSR1);
 
    while (1)
    {
        sleep(5);
    }
 
    return 0;
}