Import Upstream version 2.72.4
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641
gio/gunixoutputstream.c
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641
gio/gunixoutputstream.c
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/uio.h>
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#include <glib.h>
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#include <glib/gstdio.h>
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#include <glib/glib-unix.h>
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#include "gioerror.h"
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#include "gunixoutputstream.h"
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#include "gcancellable.h"
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#include "gasynchelper.h"
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#include "gfiledescriptorbased.h"
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#include "glibintl.h"
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#include "gioprivate.h"
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#include "giounix-private.h"
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/**
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* SECTION:gunixoutputstream
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* @short_description: Streaming output operations for UNIX file descriptors
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* @include: gio/gunixoutputstream.h
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* @see_also: #GOutputStream
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*
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* #GUnixOutputStream implements #GOutputStream for writing to a UNIX
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* file descriptor, including asynchronous operations. (If the file
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* descriptor refers to a socket or pipe, this will use poll() to do
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* asynchronous I/O. If it refers to a regular file, it will fall back
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* to doing asynchronous I/O in another thread.)
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*
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* Note that `<gio/gunixoutputstream.h>` belongs to the UNIX-specific GIO
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* interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config file
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* when using it.
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*/
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enum {
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PROP_0,
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PROP_FD,
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PROP_CLOSE_FD
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};
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struct _GUnixOutputStreamPrivate {
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int fd;
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guint close_fd : 1;
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guint can_poll : 1;
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};
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static void g_unix_output_stream_pollable_iface_init (GPollableOutputStreamInterface *iface);
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static void g_unix_output_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface);
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G_DEFINE_TYPE_WITH_CODE (GUnixOutputStream, g_unix_output_stream, G_TYPE_OUTPUT_STREAM,
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G_ADD_PRIVATE (GUnixOutputStream)
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G_IMPLEMENT_INTERFACE (G_TYPE_POLLABLE_OUTPUT_STREAM,
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g_unix_output_stream_pollable_iface_init)
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G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED,
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g_unix_output_stream_file_descriptor_based_iface_init)
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)
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static void g_unix_output_stream_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void g_unix_output_stream_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static gssize g_unix_output_stream_write (GOutputStream *stream,
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const void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_unix_output_stream_writev (GOutputStream *stream,
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const GOutputVector *vectors,
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gsize n_vectors,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_unix_output_stream_close (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_unix_output_stream_pollable_can_poll (GPollableOutputStream *stream);
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static gboolean g_unix_output_stream_pollable_is_writable (GPollableOutputStream *stream);
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static GSource *g_unix_output_stream_pollable_create_source (GPollableOutputStream *stream,
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GCancellable *cancellable);
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static GPollableReturn g_unix_output_stream_pollable_writev_nonblocking (GPollableOutputStream *stream,
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const GOutputVector *vectors,
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gsize n_vectors,
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gsize *bytes_written,
|
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GError **error);
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static void
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g_unix_output_stream_class_init (GUnixOutputStreamClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GOutputStreamClass *stream_class = G_OUTPUT_STREAM_CLASS (klass);
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gobject_class->get_property = g_unix_output_stream_get_property;
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gobject_class->set_property = g_unix_output_stream_set_property;
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stream_class->write_fn = g_unix_output_stream_write;
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stream_class->writev_fn = g_unix_output_stream_writev;
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stream_class->close_fn = g_unix_output_stream_close;
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/**
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* GUnixOutputStream:fd:
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*
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* The file descriptor that the stream writes to.
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*
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* Since: 2.20
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*/
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g_object_class_install_property (gobject_class,
|
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PROP_FD,
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g_param_spec_int ("fd",
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P_("File descriptor"),
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P_("The file descriptor to write to"),
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G_MININT, G_MAXINT, -1,
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G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));
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/**
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* GUnixOutputStream:close-fd:
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*
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* Whether to close the file descriptor when the stream is closed.
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*
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* Since: 2.20
|
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*/
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g_object_class_install_property (gobject_class,
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PROP_CLOSE_FD,
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g_param_spec_boolean ("close-fd",
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P_("Close file descriptor"),
|
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P_("Whether to close the file descriptor when the stream is closed"),
|
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TRUE,
|
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G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));
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}
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static void
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g_unix_output_stream_pollable_iface_init (GPollableOutputStreamInterface *iface)
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{
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iface->can_poll = g_unix_output_stream_pollable_can_poll;
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iface->is_writable = g_unix_output_stream_pollable_is_writable;
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iface->create_source = g_unix_output_stream_pollable_create_source;
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iface->writev_nonblocking = g_unix_output_stream_pollable_writev_nonblocking;
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}
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static void
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g_unix_output_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface)
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{
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iface->get_fd = (int (*) (GFileDescriptorBased *))g_unix_output_stream_get_fd;
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}
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static void
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g_unix_output_stream_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GUnixOutputStream *unix_stream;
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unix_stream = G_UNIX_OUTPUT_STREAM (object);
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switch (prop_id)
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{
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case PROP_FD:
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unix_stream->priv->fd = g_value_get_int (value);
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unix_stream->priv->can_poll = _g_fd_is_pollable (unix_stream->priv->fd);
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break;
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case PROP_CLOSE_FD:
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unix_stream->priv->close_fd = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_unix_output_stream_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
|
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{
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GUnixOutputStream *unix_stream;
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unix_stream = G_UNIX_OUTPUT_STREAM (object);
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switch (prop_id)
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{
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case PROP_FD:
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g_value_set_int (value, unix_stream->priv->fd);
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break;
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case PROP_CLOSE_FD:
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g_value_set_boolean (value, unix_stream->priv->close_fd);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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g_unix_output_stream_init (GUnixOutputStream *unix_stream)
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{
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unix_stream->priv = g_unix_output_stream_get_instance_private (unix_stream);
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unix_stream->priv->fd = -1;
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unix_stream->priv->close_fd = TRUE;
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}
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/**
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* g_unix_output_stream_new:
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* @fd: a UNIX file descriptor
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* @close_fd: %TRUE to close the file descriptor when done
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*
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* Creates a new #GUnixOutputStream for the given @fd.
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*
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* If @close_fd, is %TRUE, the file descriptor will be closed when
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* the output stream is destroyed.
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*
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* Returns: a new #GOutputStream
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**/
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GOutputStream *
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g_unix_output_stream_new (gint fd,
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gboolean close_fd)
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{
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GUnixOutputStream *stream;
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g_return_val_if_fail (fd != -1, NULL);
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stream = g_object_new (G_TYPE_UNIX_OUTPUT_STREAM,
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"fd", fd,
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"close-fd", close_fd,
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NULL);
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return G_OUTPUT_STREAM (stream);
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}
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/**
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* g_unix_output_stream_set_close_fd:
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* @stream: a #GUnixOutputStream
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* @close_fd: %TRUE to close the file descriptor when done
|
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*
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* Sets whether the file descriptor of @stream shall be closed
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* when the stream is closed.
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*
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* Since: 2.20
|
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*/
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void
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g_unix_output_stream_set_close_fd (GUnixOutputStream *stream,
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gboolean close_fd)
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{
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g_return_if_fail (G_IS_UNIX_OUTPUT_STREAM (stream));
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|
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close_fd = close_fd != FALSE;
|
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if (stream->priv->close_fd != close_fd)
|
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{
|
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stream->priv->close_fd = close_fd;
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g_object_notify (G_OBJECT (stream), "close-fd");
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}
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}
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/**
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* g_unix_output_stream_get_close_fd:
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||||
* @stream: a #GUnixOutputStream
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*
|
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* Returns whether the file descriptor of @stream will be
|
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* closed when the stream is closed.
|
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*
|
||||
* Returns: %TRUE if the file descriptor is closed when done
|
||||
*
|
||||
* Since: 2.20
|
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*/
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gboolean
|
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g_unix_output_stream_get_close_fd (GUnixOutputStream *stream)
|
||||
{
|
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g_return_val_if_fail (G_IS_UNIX_OUTPUT_STREAM (stream), FALSE);
|
||||
|
||||
return stream->priv->close_fd;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_unix_output_stream_get_fd:
|
||||
* @stream: a #GUnixOutputStream
|
||||
*
|
||||
* Return the UNIX file descriptor that the stream writes to.
|
||||
*
|
||||
* Returns: The file descriptor of @stream
|
||||
*
|
||||
* Since: 2.20
|
||||
*/
|
||||
gint
|
||||
g_unix_output_stream_get_fd (GUnixOutputStream *stream)
|
||||
{
|
||||
g_return_val_if_fail (G_IS_UNIX_OUTPUT_STREAM (stream), -1);
|
||||
|
||||
return stream->priv->fd;
|
||||
}
|
||||
|
||||
static gssize
|
||||
g_unix_output_stream_write (GOutputStream *stream,
|
||||
const void *buffer,
|
||||
gsize count,
|
||||
GCancellable *cancellable,
|
||||
GError **error)
|
||||
{
|
||||
GUnixOutputStream *unix_stream;
|
||||
gssize res = -1;
|
||||
GPollFD poll_fds[2];
|
||||
int nfds = 0;
|
||||
int poll_ret;
|
||||
|
||||
unix_stream = G_UNIX_OUTPUT_STREAM (stream);
|
||||
|
||||
poll_fds[0].fd = unix_stream->priv->fd;
|
||||
poll_fds[0].events = G_IO_OUT;
|
||||
nfds++;
|
||||
|
||||
if (unix_stream->priv->can_poll &&
|
||||
g_cancellable_make_pollfd (cancellable, &poll_fds[1]))
|
||||
nfds++;
|
||||
|
||||
while (1)
|
||||
{
|
||||
int errsv;
|
||||
|
||||
poll_fds[0].revents = poll_fds[1].revents = 0;
|
||||
do
|
||||
{
|
||||
poll_ret = g_poll (poll_fds, nfds, -1);
|
||||
errsv = errno;
|
||||
}
|
||||
while (poll_ret == -1 && errsv == EINTR);
|
||||
|
||||
if (poll_ret == -1)
|
||||
{
|
||||
g_set_error (error, G_IO_ERROR,
|
||||
g_io_error_from_errno (errsv),
|
||||
_("Error writing to file descriptor: %s"),
|
||||
g_strerror (errsv));
|
||||
break;
|
||||
}
|
||||
|
||||
if (g_cancellable_set_error_if_cancelled (cancellable, error))
|
||||
break;
|
||||
|
||||
if (!poll_fds[0].revents)
|
||||
continue;
|
||||
|
||||
res = write (unix_stream->priv->fd, buffer, count);
|
||||
errsv = errno;
|
||||
if (res == -1)
|
||||
{
|
||||
if (errsv == EINTR || errsv == EAGAIN)
|
||||
continue;
|
||||
|
||||
g_set_error (error, G_IO_ERROR,
|
||||
g_io_error_from_errno (errsv),
|
||||
_("Error writing to file descriptor: %s"),
|
||||
g_strerror (errsv));
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if (nfds == 2)
|
||||
g_cancellable_release_fd (cancellable);
|
||||
return res;
|
||||
}
|
||||
|
||||
/* Macro to check if struct iovec and GOutputVector have the same ABI */
|
||||
#define G_OUTPUT_VECTOR_IS_IOVEC (sizeof (struct iovec) == sizeof (GOutputVector) && \
|
||||
G_SIZEOF_MEMBER (struct iovec, iov_base) == G_SIZEOF_MEMBER (GOutputVector, buffer) && \
|
||||
G_STRUCT_OFFSET (struct iovec, iov_base) == G_STRUCT_OFFSET (GOutputVector, buffer) && \
|
||||
G_SIZEOF_MEMBER (struct iovec, iov_len) == G_SIZEOF_MEMBER (GOutputVector, size) && \
|
||||
G_STRUCT_OFFSET (struct iovec, iov_len) == G_STRUCT_OFFSET (GOutputVector, size))
|
||||
|
||||
static gboolean
|
||||
g_unix_output_stream_writev (GOutputStream *stream,
|
||||
const GOutputVector *vectors,
|
||||
gsize n_vectors,
|
||||
gsize *bytes_written,
|
||||
GCancellable *cancellable,
|
||||
GError **error)
|
||||
{
|
||||
GUnixOutputStream *unix_stream;
|
||||
gssize res = -1;
|
||||
GPollFD poll_fds[2];
|
||||
int nfds = 0;
|
||||
int poll_ret;
|
||||
struct iovec *iov;
|
||||
|
||||
if (bytes_written)
|
||||
*bytes_written = 0;
|
||||
|
||||
/* Clamp the number of vectors if more given than we can write in one go.
|
||||
* The caller has to handle short writes anyway.
|
||||
*/
|
||||
if (n_vectors > G_IOV_MAX)
|
||||
n_vectors = G_IOV_MAX;
|
||||
|
||||
unix_stream = G_UNIX_OUTPUT_STREAM (stream);
|
||||
|
||||
if (G_OUTPUT_VECTOR_IS_IOVEC)
|
||||
{
|
||||
/* ABI is compatible */
|
||||
iov = (struct iovec *) vectors;
|
||||
}
|
||||
else
|
||||
{
|
||||
gsize i;
|
||||
|
||||
/* ABI is incompatible */
|
||||
iov = g_newa (struct iovec, n_vectors);
|
||||
for (i = 0; i < n_vectors; i++)
|
||||
{
|
||||
iov[i].iov_base = (void *)vectors[i].buffer;
|
||||
iov[i].iov_len = vectors[i].size;
|
||||
}
|
||||
}
|
||||
|
||||
poll_fds[0].fd = unix_stream->priv->fd;
|
||||
poll_fds[0].events = G_IO_OUT;
|
||||
nfds++;
|
||||
|
||||
if (unix_stream->priv->can_poll &&
|
||||
g_cancellable_make_pollfd (cancellable, &poll_fds[1]))
|
||||
nfds++;
|
||||
|
||||
while (1)
|
||||
{
|
||||
int errsv;
|
||||
|
||||
poll_fds[0].revents = poll_fds[1].revents = 0;
|
||||
do
|
||||
{
|
||||
poll_ret = g_poll (poll_fds, nfds, -1);
|
||||
errsv = errno;
|
||||
}
|
||||
while (poll_ret == -1 && errsv == EINTR);
|
||||
|
||||
if (poll_ret == -1)
|
||||
{
|
||||
g_set_error (error, G_IO_ERROR,
|
||||
g_io_error_from_errno (errsv),
|
||||
_("Error writing to file descriptor: %s"),
|
||||
g_strerror (errsv));
|
||||
break;
|
||||
}
|
||||
|
||||
if (g_cancellable_set_error_if_cancelled (cancellable, error))
|
||||
break;
|
||||
|
||||
if (!poll_fds[0].revents)
|
||||
continue;
|
||||
|
||||
res = writev (unix_stream->priv->fd, iov, n_vectors);
|
||||
errsv = errno;
|
||||
if (res == -1)
|
||||
{
|
||||
if (errsv == EINTR || errsv == EAGAIN)
|
||||
continue;
|
||||
|
||||
g_set_error (error, G_IO_ERROR,
|
||||
g_io_error_from_errno (errsv),
|
||||
_("Error writing to file descriptor: %s"),
|
||||
g_strerror (errsv));
|
||||
}
|
||||
|
||||
if (bytes_written)
|
||||
*bytes_written = res;
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if (nfds == 2)
|
||||
g_cancellable_release_fd (cancellable);
|
||||
return res != -1;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
g_unix_output_stream_close (GOutputStream *stream,
|
||||
GCancellable *cancellable,
|
||||
GError **error)
|
||||
{
|
||||
GUnixOutputStream *unix_stream;
|
||||
int res;
|
||||
|
||||
unix_stream = G_UNIX_OUTPUT_STREAM (stream);
|
||||
|
||||
if (!unix_stream->priv->close_fd)
|
||||
return TRUE;
|
||||
|
||||
/* 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 file descriptor: %s"),
|
||||
g_strerror (errsv));
|
||||
}
|
||||
|
||||
return res != -1;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
g_unix_output_stream_pollable_can_poll (GPollableOutputStream *stream)
|
||||
{
|
||||
return G_UNIX_OUTPUT_STREAM (stream)->priv->can_poll;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
g_unix_output_stream_pollable_is_writable (GPollableOutputStream *stream)
|
||||
{
|
||||
GUnixOutputStream *unix_stream = G_UNIX_OUTPUT_STREAM (stream);
|
||||
GPollFD poll_fd;
|
||||
gint result;
|
||||
|
||||
poll_fd.fd = unix_stream->priv->fd;
|
||||
poll_fd.events = G_IO_OUT;
|
||||
poll_fd.revents = 0;
|
||||
|
||||
do
|
||||
result = g_poll (&poll_fd, 1, 0);
|
||||
while (result == -1 && errno == EINTR);
|
||||
|
||||
return poll_fd.revents != 0;
|
||||
}
|
||||
|
||||
static GSource *
|
||||
g_unix_output_stream_pollable_create_source (GPollableOutputStream *stream,
|
||||
GCancellable *cancellable)
|
||||
{
|
||||
GUnixOutputStream *unix_stream = G_UNIX_OUTPUT_STREAM (stream);
|
||||
GSource *inner_source, *cancellable_source, *pollable_source;
|
||||
|
||||
pollable_source = g_pollable_source_new (G_OBJECT (stream));
|
||||
|
||||
inner_source = g_unix_fd_source_new (unix_stream->priv->fd, G_IO_OUT);
|
||||
g_source_set_dummy_callback (inner_source);
|
||||
g_source_add_child_source (pollable_source, inner_source);
|
||||
g_source_unref (inner_source);
|
||||
|
||||
if (cancellable)
|
||||
{
|
||||
cancellable_source = g_cancellable_source_new (cancellable);
|
||||
g_source_set_dummy_callback (cancellable_source);
|
||||
g_source_add_child_source (pollable_source, cancellable_source);
|
||||
g_source_unref (cancellable_source);
|
||||
}
|
||||
|
||||
return pollable_source;
|
||||
}
|
||||
|
||||
static GPollableReturn
|
||||
g_unix_output_stream_pollable_writev_nonblocking (GPollableOutputStream *stream,
|
||||
const GOutputVector *vectors,
|
||||
gsize n_vectors,
|
||||
gsize *bytes_written,
|
||||
GError **error)
|
||||
{
|
||||
GUnixOutputStream *unix_stream = G_UNIX_OUTPUT_STREAM (stream);
|
||||
struct iovec *iov;
|
||||
gssize res = -1;
|
||||
|
||||
if (!g_pollable_output_stream_is_writable (stream))
|
||||
{
|
||||
*bytes_written = 0;
|
||||
return G_POLLABLE_RETURN_WOULD_BLOCK;
|
||||
}
|
||||
|
||||
/* Clamp the number of vectors if more given than we can write in one go.
|
||||
* The caller has to handle short writes anyway.
|
||||
*/
|
||||
if (n_vectors > G_IOV_MAX)
|
||||
n_vectors = G_IOV_MAX;
|
||||
|
||||
if (G_OUTPUT_VECTOR_IS_IOVEC)
|
||||
{
|
||||
/* ABI is compatible */
|
||||
iov = (struct iovec *) vectors;
|
||||
}
|
||||
else
|
||||
{
|
||||
gsize i;
|
||||
|
||||
/* ABI is incompatible */
|
||||
iov = g_newa (struct iovec, n_vectors);
|
||||
for (i = 0; i < n_vectors; i++)
|
||||
{
|
||||
iov[i].iov_base = (void *)vectors[i].buffer;
|
||||
iov[i].iov_len = vectors[i].size;
|
||||
}
|
||||
}
|
||||
|
||||
while (1)
|
||||
{
|
||||
int errsv;
|
||||
|
||||
res = writev (unix_stream->priv->fd, iov, n_vectors);
|
||||
errsv = errno;
|
||||
if (res == -1)
|
||||
{
|
||||
if (errsv == EINTR)
|
||||
continue;
|
||||
|
||||
g_set_error (error, G_IO_ERROR,
|
||||
g_io_error_from_errno (errsv),
|
||||
_("Error writing to file descriptor: %s"),
|
||||
g_strerror (errsv));
|
||||
}
|
||||
|
||||
if (bytes_written)
|
||||
*bytes_written = res;
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
return res != -1 ? G_POLLABLE_RETURN_OK : G_POLLABLE_RETURN_FAILED;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue