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fd.c

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

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <termios.h>
#include "chan_user.h"
#include "kern_constants.h"
#include "os.h"
#include "um_malloc.h"
#include "user.h"

struct fd_chan {
      int fd;
      int raw;
      struct termios tt;
      char str[sizeof("1234567890\0")];
};

static void *fd_init(char *str, int device, const struct chan_opts *opts)
{
      struct fd_chan *data;
      char *end;
      int n;

      if (*str != ':') {
            printk(UM_KERN_ERR "fd_init : channel type 'fd' must specify a "
                   "file descriptor\n");
            return NULL;
      }
      str++;
      n = strtoul(str, &end, 0);
      if ((*end != '\0') || (end == str)) {
            printk(UM_KERN_ERR "fd_init : couldn't parse file descriptor "
                   "'%s'\n", str);
            return NULL;
      }

      data = kmalloc(sizeof(*data), UM_GFP_KERNEL);
      if (data == NULL)
            return NULL;

      *data = ((struct fd_chan) { .fd     = n,
                            .raw    = opts->raw });
      return data;
}

static int fd_open(int input, int output, int primary, void *d, char **dev_out)
{
      struct fd_chan *data = d;
      int err;

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

            err = raw(data->fd);
            if (err)
                  return err;
      }
      sprintf(data->str, "%d", data->fd);
      *dev_out = data->str;
      return data->fd;
}

static void fd_close(int fd, void *d)
{
      struct fd_chan *data = d;
      int err;

      if (!data->raw || !isatty(fd))
            return;

      CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
      if (err)
            printk(UM_KERN_ERR "Failed to restore terminal state - "
                   "errno = %d\n", -err);
      data->raw = 0;
}

const struct chan_ops fd_ops = {
      .type       = "fd",
      .init       = fd_init,
      .open       = fd_open,
      .close            = fd_close,
      .read       = generic_read,
      .write            = generic_write,
      .console_write    = generic_console_write,
      .window_size      = generic_window_size,
      .free       = generic_free,
      .winch            = 1,
};

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