SPO-01-NIX

#include <stdio.h>
#include <stdlib.h>
#include <curses.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>

void drawtime(int x, int y)
{
    // Get current time
    time_t t = time(NULL);
    // Transform to string
    char* s = ctime(&t);
    // Write time to given position of console
    mvaddstr(x,y,s);
    // Refresh output
    refresh();
    sleep(1);
}

int kbhit(){
    fd_set rfds;
    struct timeval tv;

    /* Ждем, пока на стандартном вводе (fd 0) что-нибудь  появится. */
    FD_ZERO(&rfds);
    FD_SET(0, &rfds);
    tv.tv_sec = 0;
    tv.tv_usec = 100;

   return select(1, &rfds, NULL, NULL, &tv);
}

void init_curses()
{
    // Initialize all curses data structures
    initscr();
    //Set cursor set to 0 - invisible
    curs_set(0);
    // Disable input echo
    noecho();
    refresh();

}

int waitForChild(pid_t pid)
{
    int status;
    pid_t w = waitpid(pid, &status, WCONTINUED | WUNTRACED);
    if ( w == -1 )
    {
        return 0;
    }
    if (WIFEXITED(status) || WIFSIGNALED(status)){
        return 1;
    }
    return 1;
}

int main(int argc, char** argv)
{
    init_curses();
    // Fork current process
    pid_t childpid = fork();
    int childExist = 1;

    if (childpid){ // parent
        while( !kbhit() )
        {
            mvaddstr(0,0,"Parent");
            drawtime(2,0);
        }
        // Parent takes kbhit()
        kill(childpid, SIGTERM); // kill child
        if (!waitForChild(childpid))
            exit(EXIT_FAILURE);
    }
    else{ // child
        while( true )
        {
            mvaddstr(0, 40,"Child");
            drawtime(2 ,40);
        }
    }
    // Exit from curses and restore default settings
    endwin();
    exit(EXIT_SUCCESS);
}