/*
** select.c -- a select() demo
*/

#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#define STDIN 0  /* file descriptor for standard input */

main()
{
    struct timeval tv;
    fd_set readfds;

    tv.tv_sec = 2;
    tv.tv_usec = 500000;

    FD_ZERO(&readfds);
    FD_SET(STDIN, &readfds);

    /* don't care about writefds and exceptfds: */
    select(STDIN+1, &readfds, NULL, NULL, &tv);

    if (FD_ISSET(STDIN, &readfds))
        printf("A key was pressed!\n");
    else
        printf("Timed out.\n");
}