isatty.c

微软的基于HMM的人脸识别原代码, 非常经典的说

/* isatty.c -- chek the terminal device.
 * 
 * Copyright (c) 1995 Cygnus Support
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice is included verbatim in any distributions. No written agreement,
 * license, or royalty fee is required for any of the authorized uses.
 * Modifications to this software may be copyrighted by their authors
 * and need not follow the licensing terms described here, provided that
 * the new terms are clearly indicated on the first page of each file where
 * they apply.
 */
#include "glue.h"

/*
 * isatty -- returns 1 if connected to a terminal device,
 *           returns 0 if not. Since we're hooked up to a
 *           serial port, we'll say yes _AND return a 1.
 */
int
_DEFUN (isatty, (fd),
       int fd)
{
  #ifdef debuglg
  prs("[isatty]\n");
  inbyte();
  #endif
  return (1);
}