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glib/gio/gunixinputstream.c
Michael Natterer a4427bfff5 chain up unconditionally in finalize() and dispose(). Also don't 
2008-06-16  Michael Natterer  <mitch@imendio.com>

	* *.c: chain up unconditionally in finalize() and dispose(). Also
	don't dereference these function pointers when calling them since
	that has no meaning at all.


svn path=/trunk/; revision=7048
2008-06-16 09:54:04 +00:00

496 lines
13 KiB
C
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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* 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.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <poll.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "gioerror.h"
#include "gsimpleasyncresult.h"
#include "gunixinputstream.h"
#include "gcancellable.h"
#include "gasynchelper.h"
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gunixinputstream
* @short_description: Streaming input operations for Unix file descriptors
* @include: gio/gunixinputstream.h
* @see_also: #GInputStream
*
* #GUnixInputStream implements #GInputStream for reading from a
* unix file descriptor, including asynchronous operations. The file
* descriptor must be selectable, so it doesn't work with opened files.
**/
G_DEFINE_TYPE (GUnixInputStream, g_unix_input_stream, G_TYPE_INPUT_STREAM);
struct _GUnixInputStreamPrivate {
int fd;
gboolean close_fd_at_close;
};
static gssize g_unix_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error);
static gboolean g_unix_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error);
static void g_unix_input_stream_read_async (GInputStream *stream,
void *buffer,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gssize g_unix_input_stream_read_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static void g_unix_input_stream_skip_async (GInputStream *stream,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gssize g_unix_input_stream_skip_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static void g_unix_input_stream_close_async (GInputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gboolean g_unix_input_stream_close_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static void
g_unix_input_stream_finalize (GObject *object)
{
GUnixInputStream *stream;
stream = G_UNIX_INPUT_STREAM (object);
G_OBJECT_CLASS (g_unix_input_stream_parent_class)->finalize (object);
}
static void
g_unix_input_stream_class_init (GUnixInputStreamClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
g_type_class_add_private (klass, sizeof (GUnixInputStreamPrivate));
gobject_class->finalize = g_unix_input_stream_finalize;
stream_class->read_fn = g_unix_input_stream_read;
stream_class->close_fn = g_unix_input_stream_close;
stream_class->read_async = g_unix_input_stream_read_async;
stream_class->read_finish = g_unix_input_stream_read_finish;
if (0)
{
/* TODO: Implement instead of using fallbacks */
stream_class->skip_async = g_unix_input_stream_skip_async;
stream_class->skip_finish = g_unix_input_stream_skip_finish;
}
stream_class->close_async = g_unix_input_stream_close_async;
stream_class->close_finish = g_unix_input_stream_close_finish;
}
static void
g_unix_input_stream_init (GUnixInputStream *unix_stream)
{
unix_stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (unix_stream,
G_TYPE_UNIX_INPUT_STREAM,
GUnixInputStreamPrivate);
}
/**
* g_unix_input_stream_new:
* @fd: unix file descriptor.
* @close_fd_at_close: a #gboolean.
*
* Creates a new #GUnixInputStream for the given @fd. If @close_fd_at_close
* is %TRUE, the file descriptor will be closed when the stream is closed.
*
* Returns: a #GUnixInputStream.
**/
GInputStream *
g_unix_input_stream_new (int fd,
gboolean close_fd_at_close)
{
GUnixInputStream *stream;
g_return_val_if_fail (fd != -1, NULL);
stream = g_object_new (G_TYPE_UNIX_INPUT_STREAM, NULL);
stream->priv->fd = fd;
stream->priv->close_fd_at_close = close_fd_at_close;
return G_INPUT_STREAM (stream);
}
static gssize
g_unix_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
{
GUnixInputStream *unix_stream;
gssize res;
struct pollfd poll_fds[2];
int poll_ret;
int cancel_fd;
unix_stream = G_UNIX_INPUT_STREAM (stream);
cancel_fd = g_cancellable_get_fd (cancellable);
if (cancel_fd != -1)
{
do
{
poll_fds[0].events = POLLIN;
poll_fds[0].fd = unix_stream->priv->fd;
poll_fds[1].events = POLLIN;
poll_fds[1].fd = cancel_fd;
poll_ret = poll (poll_fds, 2, -1);
}
while (poll_ret == -1 && errno == EINTR);
if (poll_ret == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error reading from unix: %s"),
g_strerror (errsv));
return -1;
}
}
while (1)
{
if (g_cancellable_set_error_if_cancelled (cancellable, error))
break;
res = read (unix_stream->priv->fd, buffer, count);
if (res == -1)
{
int errsv = errno;
if (errsv == EINTR)
continue;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error reading from unix: %s"),
g_strerror (errsv));
}
break;
}
return res;
}
static gboolean
g_unix_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
GUnixInputStream *unix_stream;
int res;
unix_stream = G_UNIX_INPUT_STREAM (stream);
if (!unix_stream->priv->close_fd_at_close)
return TRUE;
while (1)
{
/* This might block during the close. Doesn't seem to be a way to avoid it though. */
res = close (unix_stream->priv->fd);
if (res == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error closing unix: %s"),
g_strerror (errsv));
}
break;
}
return res != -1;
}
typedef struct {
gsize count;
void *buffer;
GAsyncReadyCallback callback;
gpointer user_data;
GCancellable *cancellable;
GUnixInputStream *stream;
} ReadAsyncData;
static gboolean
read_async_cb (ReadAsyncData *data,
GIOCondition condition,
int fd)
{
GSimpleAsyncResult *simple;
GError *error = NULL;
gssize count_read;
/* We know that we can read from fd once without blocking */
while (1)
{
if (g_cancellable_set_error_if_cancelled (data->cancellable, &error))
{
count_read = -1;
break;
}
count_read = read (data->stream->priv->fd, data->buffer, data->count);
if (count_read == -1)
{
int errsv = errno;
if (errsv == EINTR)
continue;
g_set_error (&error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error reading from unix: %s"),
g_strerror (errsv));
}
break;
}
simple = g_simple_async_result_new (G_OBJECT (data->stream),
data->callback,
data->user_data,
g_unix_input_stream_read_async);
g_simple_async_result_set_op_res_gssize (simple, count_read);
if (count_read == -1)
{
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
}
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
return FALSE;
}
static void
g_unix_input_stream_read_async (GInputStream *stream,
void *buffer,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSource *source;
GUnixInputStream *unix_stream;
ReadAsyncData *data;
unix_stream = G_UNIX_INPUT_STREAM (stream);
data = g_new0 (ReadAsyncData, 1);
data->count = count;
data->buffer = buffer;
data->callback = callback;
data->user_data = user_data;
data->cancellable = cancellable;
data->stream = unix_stream;
source = _g_fd_source_new (unix_stream->priv->fd,
POLLIN,
cancellable);
g_source_set_callback (source, (GSourceFunc)read_async_cb, data, g_free);
g_source_attach (source, NULL);
g_source_unref (source);
}
static gssize
g_unix_input_stream_read_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
gssize nread;
simple = G_SIMPLE_ASYNC_RESULT (result);
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_unix_input_stream_read_async);
nread = g_simple_async_result_get_op_res_gssize (simple);
return nread;
}
static void
g_unix_input_stream_skip_async (GInputStream *stream,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data)
{
g_warn_if_reached ();
/* TODO: Not implemented */
}
static gssize
g_unix_input_stream_skip_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
g_warn_if_reached ();
return 0;
/* TODO: Not implemented */
}
typedef struct {
GInputStream *stream;
GAsyncReadyCallback callback;
gpointer user_data;
} CloseAsyncData;
static void
close_async_data_free (gpointer _data)
{
CloseAsyncData *data = _data;
g_free (data);
}
static gboolean
close_async_cb (CloseAsyncData *data)
{
GUnixInputStream *unix_stream;
GSimpleAsyncResult *simple;
GError *error = NULL;
gboolean result;
int res;
unix_stream = G_UNIX_INPUT_STREAM (data->stream);
if (!unix_stream->priv->close_fd_at_close)
{
result = TRUE;
goto out;
}
while (1)
{
res = close (unix_stream->priv->fd);
if (res == -1)
{
int errsv = errno;
g_set_error (&error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error closing unix: %s"),
g_strerror (errsv));
}
break;
}
result = res != -1;
out:
simple = g_simple_async_result_new (G_OBJECT (data->stream),
data->callback,
data->user_data,
g_unix_input_stream_close_async);
if (!result)
{
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
}
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
return FALSE;
}
static void
g_unix_input_stream_close_async (GInputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSource *idle;
CloseAsyncData *data;
data = g_new0 (CloseAsyncData, 1);
data->stream = stream;
data->callback = callback;
data->user_data = user_data;
idle = g_idle_source_new ();
g_source_set_callback (idle, (GSourceFunc)close_async_cb, data, close_async_data_free);
g_source_attach (idle, NULL);
g_source_unref (idle);
}
static gboolean
g_unix_input_stream_close_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
/* Failures handled in generic close_finish code */
return TRUE;
}
#define __G_UNIX_INPUT_STREAM_C__
#include "gioaliasdef.c"
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