#include <sys/select.h>
#include <termios.h>
#include <sys/ioctl.h>
int _kbhit()
{
static const int STDIN = ;
static bool initialized = false; if (! initialized)
{
// Use termios to turn off line buffering
termios term;
tcgetattr(STDIN, &term);
term.c_lflag &= ~ICANON;
tcsetattr(STDIN, TCSANOW, &term);
setbuf(stdin, NULL);
initialized = true;
} int bytesWaiting;
ioctl(STDIN, FIONREAD, &bytesWaiting);
return bytesWaiting; }
至于干什么用,你发现了它就表示你则知道它是做什么用的。