函数名: isatty
功 能: 检查设备类型
用 法: #include <io.h>
int isatty(int handle);
程序例:
#include <stdio.h>
#include <io.h>
int main(void)
{
int handle;
handle = fileno(stdprn);
if (isatty(handle))
printf("Handle %d is a device type\n", handle);
else
printf("Handle %d isn't a device type\n", handle);
return 0;
}