| /* 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 much 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); |
| |
| if (G_OBJECT_CLASS (g_unix_input_stream_parent_class)->finalize) |
| (*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) |
| { |
| g_set_error (error, G_IO_ERROR, |
| g_io_error_from_errno (errno), |
| _("Error reading from unix: %s"), |
| g_strerror (errno)); |
| 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) |
| { |
| if (errno == EINTR) |
| continue; |
| |
| g_set_error (error, G_IO_ERROR, |
| g_io_error_from_errno (errno), |
| _("Error reading from unix: %s"), |
| g_strerror (errno)); |
| } |
| |
| 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) |
| g_set_error (error, G_IO_ERROR, |
| g_io_error_from_errno (errno), |
| _("Error closing unix: %s"), |
| g_strerror (errno)); |
| 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) |
| { |
| if (errno == EINTR) |
| continue; |
| |
| g_set_error (&error, G_IO_ERROR, |
| g_io_error_from_errno (errno), |
| _("Error reading from unix: %s"), |
| g_strerror (errno)); |
| } |
| 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) |
| g_set_error (&error, G_IO_ERROR, |
| g_io_error_from_errno (errno), |
| _("Error closing unix: %s"), |
| g_strerror (errno)); |
| 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" |