_kbhit() for linux

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#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <termios.h>

#include <unistd.h>

#include <fcntl.h>

int kbhit(void)

{

  struct termios oldt, newt;

  int ch;

  int oldf;

  tcgetattr(STDIN_FILENO, &oldt);

  newt = oldt;

  newt.c_lflag &= ~(ICANON | ECHO);

  tcsetattr(STDIN_FILENO, TCSANOW, &newt);

  oldf = fcntl(STDIN_FILENO, F_GETFL, );

  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);

  ch = getchar();

  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

  fcntl(STDIN_FILENO, F_SETFL, oldf);

  if(ch != EOF)

  {

    ungetc(ch, stdin);

    return ;

  }

  return ;

}

main( int argc, char** argv )

{

    char *input = argv[];

    int nomor = argc;

    pid_t pid = ;

    /* set stuff up */

    /* accept command line args */

    pid = fork();

    if( pid ==  ){

        /* this is the "background" process.  Execute process loop here */

        int x=;

        while()

        {

            if(kbhit())

              printf("you hit keyboard");

        }

    }

    else {

        /* "foreground" process exits */

        exit();

    }

}