/*
   * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
   * Licensed under the GPL
   */
  
  #include <stddef.h>
  #include <errno.h>
  #include <fcntl.h>
  #include "chan_user.h"
  #include <os.h>
  
  /* This address is used only as a unique identifier */
  static int null_chan;
  
  static void *null_init(char *str, int device, const struct chan_opts *opts)
  {
  	return &null_chan;
  }
  
  static int null_open(int input, int output, int primary, void *d,
  		     char **dev_out)
  {
  	int fd;
  
  	*dev_out = NULL;
  
  	fd = open(DEV_NULL, O_RDWR);
  	return (fd < 0) ? -errno : fd;
  }
  
  static int null_read(int fd, char *c_out, void *unused)
  {
  	return -ENODEV;
  }
  
  static void null_free(void *data)
  {
  }
  
  const struct chan_ops null_ops = {
  	.type		= "null",
  	.init		= null_init,
  	.open		= null_open,
  	.close		= generic_close,
  	.read		= null_read,
  	.write		= generic_write,
  	.console_write	= generic_console_write,
  	.window_size	= generic_window_size,
  	.free		= null_free,
  	.winch		= 0,
  };