mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-02 17:48:55 +08:00
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/select.h>
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#define BUF_SIZE 30
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int main(int argc, char *argv[])
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{
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fd_set reads, temps;
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int result, str_len;
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char buf[BUF_SIZE];
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struct timeval timeout;
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FD_ZERO(&reads); //初始化变量
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FD_SET(0, &reads); //将文件描述符0对应的位设置为1
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/*
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timeout.tv_sec=5;
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timeout.tv_usec=5000;
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*/
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while (1)
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{
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temps = reads; //为了防止调用了select 函数后，位的内容改变，先提前存一下
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timeout.tv_sec = 5;
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timeout.tv_usec = 0;
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result = select(1, &temps, 0, 0, &timeout); //如果控制台输入数据，则返回大于0的数，没有就会超时
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if (result == -1)
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{
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puts("select error!");
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break;
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}
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else if (result == 0)
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{
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puts("Time-out!");
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}
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else
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{
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if (FD_ISSET(0, &temps)) //验证发生变化的值是否是标准输入端
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{
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str_len = read(0, buf, BUF_SIZE);
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buf[str_len] = 0;
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printf("message from console: %s", buf);
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}
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}
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}
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return 0;
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}
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