/* GLIB - Library of useful routines for C programming

 * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald

 *

 * giounix.c: IO Channels using unix file descriptors

 * Copyright 1998 Owen Taylor

 * Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

/*

 * Modified by the GLib Team and others 1997-2000.  See the AUTHORS

 * file for a list of people on the GLib Team.  See the ChangeLog

 * files for a list of changes.  These files are distributed with

 * GLib at ftp://ftp.gtk.org/pub/gtk/. 

 */

/* 

 * MT safe

 */

#include "config.h"

#ifndef __SYMBIAN32__

#define _POSIX_SOURCE		/* for SSIZE_MAX */

#endif /* __SYMBIAN32__ */

#include <sys/types.h>

#include <sys/stat.h>

#include <stdio.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <fcntl.h>

#include "glib.h"

#include "galias.h"

#ifdef __SYMBIAN32__

#include <glib_wsd.h>

#endif /* __SYMBIAN32__ */

/*

 * Unix IO Channels

 */

typedef struct _GIOUnixChannel GIOUnixChannel;

typedef struct _GIOUnixWatch GIOUnixWatch;

struct _GIOUnixChannel

{

  GIOChannel channel;

  gint fd;

};

struct _GIOUnixWatch

{

  GSource       source;

  GPollFD       pollfd;

  GIOChannel   *channel;

  GIOCondition  condition;

};

static GIOStatus	g_io_unix_read		(GIOChannel   *channel,

						 gchar        *buf,

						 gsize         count,

						 gsize        *bytes_read,

						 GError      **err);

static GIOStatus	g_io_unix_write		(GIOChannel   *channel,

						 const gchar  *buf,

						 gsize         count,

						 gsize        *bytes_written,

						 GError      **err);

static GIOStatus	g_io_unix_seek		(GIOChannel   *channel,

						 gint64        offset,

						 GSeekType     type,

						 GError      **err);

static GIOStatus	g_io_unix_close		(GIOChannel   *channel,

						 GError      **err);

static void		g_io_unix_free		(GIOChannel   *channel);

static GSource*		g_io_unix_create_watch	(GIOChannel   *channel,

						 GIOCondition  condition);

static GIOStatus	g_io_unix_set_flags	(GIOChannel   *channel,

                       				 GIOFlags      flags,

						 GError      **err);

static GIOFlags 	g_io_unix_get_flags	(GIOChannel   *channel);

static gboolean g_io_unix_prepare  (GSource     *source,

				    gint        *timeout);

static gboolean g_io_unix_check    (GSource     *source);

static gboolean g_io_unix_dispatch (GSource     *source,

				    GSourceFunc  callback,

				    gpointer     user_data);

static void     g_io_unix_finalize (GSource     *source);

#if EMULATOR

PLS(g_io_watch_funcs,giounix,GSourceFuncs)

#define g_io_watch_funcs  (*FUNCTION_NAME(g_io_watch_funcs,giounix)())

const GSourceFuncs temp_g_io_watch_funcs = {

  g_io_unix_prepare,

  g_io_unix_check,

  g_io_unix_dispatch,

  g_io_unix_finalize

};

#else

GSourceFuncs g_io_watch_funcs = {

  g_io_unix_prepare,

  g_io_unix_check,

  g_io_unix_dispatch,

  g_io_unix_finalize

};

#endif /* EMULATOR */

#ifdef __SYMBIAN32__

EXPORT_C GSourceFuncs *_g_io_watch_funcs()

{

	return &g_io_watch_funcs;

}

#endif /* __SYMBIAN32__ */

#if EMULATOR

PLS(unix_channel_funcs,giounix,GIOFuncs )

#define unix_channel_funcs (*FUNCTION_NAME(unix_channel_funcs,giounix)())

const GIOFuncs temp_unix_channel_funcs = {

  g_io_unix_read,

  g_io_unix_write,

  g_io_unix_seek,

  g_io_unix_close,

  g_io_unix_create_watch,

  g_io_unix_free,

  g_io_unix_set_flags,

  g_io_unix_get_flags,

};

#else

static GIOFuncs unix_channel_funcs = {

  g_io_unix_read,

  g_io_unix_write,

  g_io_unix_seek,

  g_io_unix_close,

  g_io_unix_create_watch,

  g_io_unix_free,

  g_io_unix_set_flags,

  g_io_unix_get_flags,

};

#endif /* EMULATOR */

static gboolean 

g_io_unix_prepare (GSource  *source,

		   gint     *timeout)

{

  GIOUnixWatch *watch = (GIOUnixWatch *)source;

  GIOCondition buffer_condition = g_io_channel_get_buffer_condition (watch->channel);

  *timeout = -1;

  /* Only return TRUE here if _all_ bits in watch->condition will be set

   */

  return ((watch->condition & buffer_condition) == watch->condition);

}

static gboolean 

g_io_unix_check (GSource  *source)

{

  GIOUnixWatch *watch = (GIOUnixWatch *)source;

  GIOCondition buffer_condition = g_io_channel_get_buffer_condition (watch->channel);

  GIOCondition poll_condition = watch->pollfd.revents;

  return ((poll_condition | buffer_condition) & watch->condition);

}

static gboolean

g_io_unix_dispatch (GSource     *source,

		    GSourceFunc  callback,

		    gpointer     user_data)

{

  GIOFunc func = (GIOFunc)callback;

  GIOUnixWatch *watch = (GIOUnixWatch *)source;

  GIOCondition buffer_condition = g_io_channel_get_buffer_condition (watch->channel);

  if (!func)

    {

      g_warning ("IO watch dispatched without callback\n"

		 "You must call g_source_connect().");

      return FALSE;

    }

  return (*func) (watch->channel,

		  (watch->pollfd.revents | buffer_condition) & watch->condition,

		  user_data);

}

static void 

g_io_unix_finalize (GSource *source)

{

  GIOUnixWatch *watch = (GIOUnixWatch *)source;

  g_io_channel_unref (watch->channel);

}

static GIOStatus

g_io_unix_read (GIOChannel *channel, 

		gchar      *buf, 

		gsize       count,

		gsize      *bytes_read,

		GError    **err)

{

  GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;

  gssize result;

  if (count > SSIZE_MAX) /* At least according to the Debian manpage for read */

    count = SSIZE_MAX;

 retry:

  result = read (unix_channel->fd, buf, count);

  if (result < 0)

    {

      *bytes_read = 0;

      switch (errno)

        {

#ifdef EINTR

          case EINTR:

            goto retry;

#endif

#ifdef EAGAIN

          case EAGAIN:

            return G_IO_STATUS_AGAIN;

#endif

          default:

            g_set_error (err, G_IO_CHANNEL_ERROR,

                         g_io_channel_error_from_errno (errno),

                         g_strerror (errno));

            return G_IO_STATUS_ERROR;

        }

    }

  *bytes_read = result;

  return (result > 0) ? G_IO_STATUS_NORMAL : G_IO_STATUS_EOF;

}

static GIOStatus

g_io_unix_write (GIOChannel  *channel, 

		 const gchar *buf, 

		 gsize       count,

		 gsize      *bytes_written,

		 GError    **err)

{

  GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;

  gssize result;

 retry:

  result = write (unix_channel->fd, buf, count);

  if (result < 0)

    {

      *bytes_written = 0;

      switch (errno)

        {

#ifdef EINTR

          case EINTR:

            goto retry;

#endif

#ifdef EAGAIN

          case EAGAIN:

            return G_IO_STATUS_AGAIN;

#endif

          default:

            g_set_error (err, G_IO_CHANNEL_ERROR,

                         g_io_channel_error_from_errno (errno),

                         g_strerror (errno));

            return G_IO_STATUS_ERROR;

        }

    }

  *bytes_written = result;

  return G_IO_STATUS_NORMAL;

}

static GIOStatus

g_io_unix_seek (GIOChannel *channel,

		gint64      offset, 

		GSeekType   type,

                GError    **err)

{

  GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;

  int whence;

  off_t tmp_offset;

  off_t result;

  switch (type)

    {

    case G_SEEK_SET:

      whence = SEEK_SET;

      break;

    case G_SEEK_CUR:

      whence = SEEK_CUR;

      break;

    case G_SEEK_END:

      whence = SEEK_END;

      break;

    default:

      whence = -1; /* Shut the compiler up */

      g_assert_not_reached ();

    }

  tmp_offset = offset;

  if (tmp_offset != offset)

    {

      g_set_error (err, G_IO_CHANNEL_ERROR,

		   g_io_channel_error_from_errno (EINVAL),

		   g_strerror (EINVAL));

      return G_IO_STATUS_ERROR;

    }

  result = lseek (unix_channel->fd, tmp_offset, whence);

  if (result < 0)

    {

      g_set_error (err, G_IO_CHANNEL_ERROR,

		   g_io_channel_error_from_errno (errno),

		   g_strerror (errno));

      return G_IO_STATUS_ERROR;

    }

  return G_IO_STATUS_NORMAL;

}

static GIOStatus

g_io_unix_close (GIOChannel *channel,

		 GError    **err)

{

  GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;

  if (close (unix_channel->fd) < 0)

    {

      g_set_error (err, G_IO_CHANNEL_ERROR,

		   g_io_channel_error_from_errno (errno),

		   g_strerror (errno));

      return G_IO_STATUS_ERROR;

    }

  return G_IO_STATUS_NORMAL;

}

static void 

g_io_unix_free (GIOChannel *channel)

{

  GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;

  g_free (unix_channel);

}

static GSource *

g_io_unix_create_watch (GIOChannel   *channel,

			GIOCondition  condition)

{

  GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel;

  GSource *source;

  GIOUnixWatch *watch;

  source = g_source_new (&g_io_watch_funcs, sizeof (GIOUnixWatch));

  watch = (GIOUnixWatch *)source;

  watch->channel = channel;

  g_io_channel_ref (channel);

  watch->condition = condition;

  watch->pollfd.fd = unix_channel->fd;

  watch->pollfd.events = condition;

  g_source_add_poll (source, &watch->pollfd);

  return source;

}

static GIOStatus

g_io_unix_set_flags (GIOChannel *channel,

                     GIOFlags    flags,

                     GError    **err)

{

  glong fcntl_flags;

  GIOUnixChannel *unix_channel = (GIOUnixChannel *) channel;

  fcntl_flags = 0;

  if (flags & G_IO_FLAG_APPEND)

    fcntl_flags |= O_APPEND;

  if (flags & G_IO_FLAG_NONBLOCK)

#ifdef O_NONBLOCK

    fcntl_flags |= O_NONBLOCK;

#else

    fcntl_flags |= O_NDELAY;

#endif

  if (fcntl (unix_channel->fd, F_SETFL, fcntl_flags) == -1)

    {

      g_set_error (err, G_IO_CHANNEL_ERROR,

		   g_io_channel_error_from_errno (errno),

		   g_strerror (errno));

      return G_IO_STATUS_ERROR;

    }

  return G_IO_STATUS_NORMAL;

}

static GIOFlags

g_io_unix_get_flags (GIOChannel *channel)

{

  GIOFlags flags = 0;

  glong fcntl_flags;

  GIOUnixChannel *unix_channel = (GIOUnixChannel *) channel;

  fcntl_flags = fcntl (unix_channel->fd, F_GETFL);

  if (fcntl_flags == -1)

    {

      g_warning (G_STRLOC "Error while getting flags for FD: %s (%d)\n",

		 g_strerror (errno), errno);

      return 0;

    }

  if (fcntl_flags & O_APPEND)

    flags |= G_IO_FLAG_APPEND;

#ifdef O_NONBLOCK

  if (fcntl_flags & O_NONBLOCK)

#else

  if (fcntl_flags & O_NDELAY)

#endif

    flags |= G_IO_FLAG_NONBLOCK;

  switch (fcntl_flags & (O_RDONLY | O_WRONLY | O_RDWR))

    {

      case O_RDONLY:

        channel->is_readable = TRUE;

        channel->is_writeable = FALSE;

        break;

      case O_WRONLY:

        channel->is_readable = FALSE;

        channel->is_writeable = TRUE;

        break;

      case O_RDWR:

        channel->is_readable = TRUE;

        channel->is_writeable = TRUE;

        break;

      default:

        g_assert_not_reached ();

    }

  return flags;

}

EXPORT_C GIOChannel *

g_io_channel_new_file (const gchar *filename,

                       const gchar *mode,

                       GError     **error)

{

  int fid, flags;

  mode_t create_mode;

  GIOChannel *channel;

  enum { /* Cheesy hack */

    MODE_R = 1 << 0,

    MODE_W = 1 << 1,

    MODE_A = 1 << 2,

    MODE_PLUS = 1 << 3

  } mode_num;

  struct stat buffer;

  g_return_val_if_fail (filename != NULL, NULL);

  g_return_val_if_fail (mode != NULL, NULL);

  g_return_val_if_fail ((error == NULL) || (*error == NULL), NULL);

  switch (mode[0])

    {

      case 'r':

        mode_num = MODE_R;

        break;

      case 'w':

        mode_num = MODE_W;

        break;

      case 'a':

        mode_num = MODE_A;

        break;

      default:

        g_warning ("Invalid GIOFileMode %s.\n", mode);

        return NULL;

    }

  switch (mode[1])

    {

      case '\0':

        break;

      case '+':

        if (mode[2] == '\0')

          {