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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* giochannel.c: IO Channel abstraction
* Copyright 1998 Owen Taylor
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
/*
* MT safe
*/
#include "glib.h"
#include <unistd.h>
typedef struct _GIOChannelPrivate GIOChannelPrivate;
struct _GIOChannelPrivate {
GIOChannel channel;
GIOFuncs *funcs;
guint ref_count;
gboolean closed;
};
GIOChannel *
g_io_channel_new (GIOFuncs *funcs,
gpointer channel_data)
{
GIOChannelPrivate *result;
GIOChannel *channel;
g_return_val_if_fail (funcs != NULL, NULL);
result = g_new (GIOChannelPrivate, 1);
channel = (GIOChannel *)result;
result->funcs = funcs;
result->ref_count = 1;
result->closed = FALSE;
channel->channel_data = channel_data;
return channel;
}
void
g_io_channel_ref (GIOChannel *channel)
{
GIOChannelPrivate *private;
g_return_if_fail (channel != NULL);
private = (GIOChannelPrivate *)channel;
private->ref_count++;
}
void
g_io_channel_unref (GIOChannel *channel)
{
GIOChannelPrivate *private;
g_return_if_fail (channel != NULL);
private = (GIOChannelPrivate *)channel;
private->ref_count--;
if (private->ref_count == 0)
{
/* We don't want to close the channel here, because
* the channel may just be wrapping a file or socket
* that the app is independently manipulating.
*/
private->funcs->io_free (channel);
g_free (private);
}
}
GIOError
g_io_channel_read (GIOChannel *channel,
gchar *buf,
guint count,
guint *bytes_read)
{
GIOChannelPrivate *private = (GIOChannelPrivate *)channel;
g_return_val_if_fail (channel != NULL, G_IO_ERROR_UNKNOWN);
g_return_val_if_fail (!private->closed, G_IO_ERROR_UNKNOWN);
return private->funcs->io_read (channel, buf, count, bytes_read);
}
GIOError
g_io_channel_write (GIOChannel *channel,
gchar *buf,
guint count,
guint *bytes_written)
{
GIOChannelPrivate *private = (GIOChannelPrivate *)channel;
g_return_val_if_fail (channel != NULL, G_IO_ERROR_UNKNOWN);
g_return_val_if_fail (!private->closed, G_IO_ERROR_UNKNOWN);
return private->funcs->io_write (channel, buf, count, bytes_written);
}
GIOError
g_io_channel_seek (GIOChannel *channel,
gint offset,
GSeekType type)
{
GIOChannelPrivate *private = (GIOChannelPrivate *)channel;
g_return_val_if_fail (channel != NULL, G_IO_ERROR_UNKNOWN);
g_return_val_if_fail (!private->closed, G_IO_ERROR_UNKNOWN);
return private->funcs->io_seek (channel, offset, type);
}
void
g_io_channel_close (GIOChannel *channel)
{
GIOChannelPrivate *private = (GIOChannelPrivate *)channel;
g_return_if_fail (channel != NULL);
g_return_if_fail (!private->closed);
private->closed = TRUE;
private->funcs->io_close (channel);
}
guint
g_io_add_watch_full (GIOChannel *channel,
gint priority,
GIOCondition condition,
GIOFunc func,
gpointer user_data,
GDestroyNotify notify)
{
GIOChannelPrivate *private = (GIOChannelPrivate *)channel;
g_return_val_if_fail (channel != NULL, 0);
g_return_val_if_fail (!private->closed, 0);
return private->funcs->io_add_watch (channel, priority, condition,
func, user_data, notify);
}
guint
g_io_add_watch (GIOChannel *channel,
GIOCondition condition,
GIOFunc func,
gpointer user_data)
{
return g_io_add_watch_full (channel, 0, condition, func, user_data, NULL);
}
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