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    1 // kompilacia: gcc -o priklad5 priklad5.c
    2 
    3 #include <errno.h>
    4 #include <stdio.h>
    5 #include <stdlib.h>
    6 #include <unistd.h>
    7 #include <sys/types.h>
    8 #include <sys/time.h>
    9 
   10 int wait_for_input_2s () {
   11         fd_set set;
   12         struct timeval timeout;
   13 
   14         FD_ZERO(&set);
   15         FD_SET(0, &set); // 0 - stdin
   16 
   17         timeout.tv_sec = 2;
   18         timeout.tv_usec = 0;
   19 
   20         return select(FD_SETSIZE, &set, NULL, NULL, &timeout);
   21 }
   22 
   23 int main (int argc, char ** argv) {
   24         while (1) {
   25                 printf("napis nieco a stlac ENTER: ");
   26                 fflush(stdout);
   27                 if (wait_for_input_2s() > 0) {
   28                         char * str;
   29                         scanf("%as", &str);
   30                         printf("\nvyborne, vies aj pisat (%s)\n\n", str);
   31                         break;
   32                 } else {
   33                         printf("\nnic si nenapisal, este raz,\n");
   34                 }
   35         }
   36 
   37         exit(EXIT_SUCCESS);
   38 }