linux下按下键退出while循环(类似于_kbhit)

#include <stdio.h>
#include <sys/select.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>
#define STDIN     0
int main()
{
    struct timeval tv = {0,0};
    struct termios term , termbak;
    char   ch;
    fd_set    fd;
   
    FD_ZERO(&fd);
    FD_SET( STDIN ,&fd);
  tcgetattr(STDIN, &term);
  termbak = term;
    term.c_lflag &= ~(ICANON|ECHO);
    tcsetattr(STDIN, TCSANOW, &term);   
    while(1)
    {
        FD_ZERO(&fd);
        FD_SET( STDIN ,&fd);
        if(   1 == select( STDIN+1,&fd,NULL,NULL,&tv)
             && 1 == read( STDIN , &ch , 1 )
             && 'q' == tolower(ch) )
            break;
        putchar('.');fflush(stdout);
        usleep(100000);
    }
   
    tcsetattr(STDIN,TCSANOW,&termbak);
   
    return 0;
}
转载自：http://topic.csdn.net/u/20100115/10/7ec685ee-27ef-4b03-b184-ce0a1e728cde.html