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gio: Implement GSeekable on GUnixInputStream

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It seems like an artificial limitation, and prevents us seeking DBus-passed file-descriptors.

Fixes https://gitlab.gnome.org/GNOME/glib/-/issues/3200
This commit is contained in:
Richard Hughes 2023-12-21 11:02:44 +00:00
parent 30d6e911c4
commit c614f5170b
1 changed files with 103 additions and 0 deletions
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103
gio/gunixinputstream.c
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@ -66,6 +66,7 @@ struct _GUnixInputStreamPrivate {
static void g_unix_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface); static void g_unix_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface);
static void g_unix_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface); static void g_unix_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface);
static void g_unix_input_stream_seekable_iface_init (GSeekableIface *iface);
G_DEFINE_TYPE_WITH_CODE (GUnixInputStream, g_unix_input_stream, G_TYPE_INPUT_STREAM, G_DEFINE_TYPE_WITH_CODE (GUnixInputStream, g_unix_input_stream, G_TYPE_INPUT_STREAM,
G_ADD_PRIVATE (GUnixInputStream) G_ADD_PRIVATE (GUnixInputStream)
@ -73,6 +74,8 @@ G_DEFINE_TYPE_WITH_CODE (GUnixInputStream, g_unix_input_stream, G_TYPE_INPUT_STR
g_unix_input_stream_pollable_iface_init) g_unix_input_stream_pollable_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED, G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED,
g_unix_input_stream_file_descriptor_based_iface_init) g_unix_input_stream_file_descriptor_based_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
g_unix_input_stream_seekable_iface_init)
) )
static void g_unix_input_stream_set_property (GObject *object, static void g_unix_input_stream_set_property (GObject *object,
@ -106,6 +109,19 @@ static gboolean g_unix_input_stream_pollable_is_readable (GPollableInputStream
static GSource *g_unix_input_stream_pollable_create_source (GPollableInputStream *stream, static GSource *g_unix_input_stream_pollable_create_source (GPollableInputStream *stream,
GCancellable *cancellable); GCancellable *cancellable);
static goffset g_unix_input_stream_tell (GSeekable *seekable);
static gboolean g_unix_input_stream_can_seek (GSeekable *seekable);
static gboolean g_unix_input_stream_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error);
static gboolean g_unix_input_stream_can_truncate (GSeekable *seekable);
static gboolean g_unix_input_stream_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error);
static void static void
g_unix_input_stream_class_init (GUnixInputStreamClass *klass) g_unix_input_stream_class_init (GUnixInputStreamClass *klass)
{ {
@ -165,6 +181,16 @@ g_unix_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface
iface->get_fd = (int (*) (GFileDescriptorBased *))g_unix_input_stream_get_fd; iface->get_fd = (int (*) (GFileDescriptorBased *))g_unix_input_stream_get_fd;
} }
static void
g_unix_input_stream_seekable_iface_init (GSeekableIface *iface)
{
iface->tell = g_unix_input_stream_tell;
iface->can_seek = g_unix_input_stream_can_seek;
iface->seek = g_unix_input_stream_seek;
iface->can_truncate = g_unix_input_stream_can_truncate;
iface->truncate_fn = g_unix_input_stream_truncate;
}
static void static void
g_unix_input_stream_set_property (GObject *object, g_unix_input_stream_set_property (GObject *object,
guint prop_id, guint prop_id,
@ -480,3 +506,80 @@ g_unix_input_stream_pollable_create_source (GPollableInputStream *stream,
return pollable_source; return pollable_source;
} }
static goffset
g_unix_input_stream_tell (GSeekable *seekable)
{
GUnixInputStream *unix_stream = G_UNIX_INPUT_STREAM (seekable);
goffset rc = lseek (unix_stream->priv->fd, 0, SEEK_CUR);
if (rc < 0)
g_critical ("cannot tell GUnixInputStream: %s", g_strerror (errno));
return rc;
}
static gboolean
g_unix_input_stream_can_seek (GSeekable *seekable)
{
GUnixInputStream *unix_stream = G_UNIX_INPUT_STREAM (seekable);
return lseek (unix_stream->priv->fd, 0, SEEK_CUR) >= 0;
}
static int
_seek_type_to_lseek (GSeekType type)
{
switch (type)
{
default:
case G_SEEK_CUR:
return SEEK_CUR;
case G_SEEK_SET:
return SEEK_SET;
case G_SEEK_END:
return SEEK_END;
}
}
static gboolean
g_unix_input_stream_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GUnixInputStream *unix_stream = G_UNIX_INPUT_STREAM (seekable);
goffset rc;
g_return_val_if_fail (G_IS_UNIX_INPUT_STREAM (unix_stream), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
rc = lseek (unix_stream->priv->fd, offset, _seek_type_to_lseek (type));
if (rc < 0)
{
g_set_error (error,
G_IO_ERROR,
g_io_error_from_errno (errno),
"Error seeking file descriptor: %s",
g_strerror (errno));
return FALSE;
}
return TRUE;
}
static gboolean
g_unix_input_stream_can_truncate (GSeekable *seekable)
{
return FALSE;
}
static gboolean
g_unix_input_stream_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
"Cannot truncate GUnixInputStream");
return FALSE;
}