select.c

//
// Created by Administrator on 2019/1/29.
//
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/select.h>
#include <w32api/_timeval.h>

#define BUF_SIZE 30

int main(int argc, char *argv[])
{
    fd_set reads, temps;
    int result, str_len;
    char buf[BUF_SIZE];
    struct timeval timeout;

    FD_ZERO(&reads);
    FD_SET(0, &reads);

/*    timeout.tv_sec=5;
    timeout.tv_usec=5000;*/

    while (1)
    {
        temps=reads;
        timeout.tv_sec=5;
        timeout.tv_usec=0;
        result=select(1, &temps, 0, 0, &timeout);
        if (result == -1) {
            puts("select() error");
            break;
        }
        else if (result == 0)
        {
            puts("Time-Out");
        }
        else {
            if (FD_ISSET(0, &temps))
            {
                str_len=read(0, buf, BUF_SIZE);
                buf[str_len]=0;
                printf("message from console: %s", buf);
            }
        }
    }
    return 0;
}