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tty.c

/*
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
 * Licensed under the GPL
 */

#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include "chan_user.h"
#include "kern_constants.h"
#include "os.h"
#include "um_malloc.h"
#include "user.h"

struct tty_chan {
      char *dev;
      int raw;
      struct termios tt;
};

static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
{
      struct tty_chan *data;

      if (*str != ':') {
            printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify "
                   "a device\n");
            return NULL;
      }
      str++;

      data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
      if (data == NULL)
            return NULL;
      *data = ((struct tty_chan) { .dev   = str,
                             .raw   = opts->raw });

      return data;
}

static int tty_open(int input, int output, int primary, void *d,
                char **dev_out)
{
      struct tty_chan *data = d;
      int fd, err, mode = 0;

      if (input && output)
            mode = O_RDWR;
      else if (input)
            mode = O_RDONLY;
      else if (output)
            mode = O_WRONLY;

      fd = open(data->dev, mode);
      if (fd < 0)
            return -errno;

      if (data->raw) {
            CATCH_EINTR(err = tcgetattr(fd, &data->tt));
            if (err)
                  return err;

            err = raw(fd);
            if (err)
                  return err;
      }

      *dev_out = data->dev;
      return fd;
}

const struct chan_ops tty_ops = {
      .type       = "tty",
      .init       = tty_chan_init,
      .open       = tty_open,
      .close            = generic_close,
      .read       = generic_read,
      .write            = generic_write,
      .console_write    = generic_console_write,
      .window_size      = generic_window_size,
      .free       = generic_free,
      .winch            = 0,
};

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