初步建立一下对 select() 函数的印象_1 - 编程论坛

程序代码：

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

int main(void) {

    fd_set rfds;

    struct timeval tv;

    int retval;

    FD_ZERO(&rfds);

    FD_SET(0, &rfds);

    tv.tv_sec = 5;

    tv.tv_usec = 0;

    retval = select( 1, &rfds, NULL, NULL, &tv);

    if( retval == -1 )

        perror( "select()" );

    else if(retval)

        /* FD_ISSET(0, &rfds) will be true */
        printf("Data is available now.\n");

    else

        printf("No data within five seconds.\n");

    return 0;
}

编译运行一下可以对select()有一个直观的感觉了

[ 本帖最后由 madfrogme 于 2012-8-30 09:17 编辑 ]