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null.c

/*
 * 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,
};

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