/usr/share/ada/adainclude/dbus-ada/d_bus-connection.adb is in libdbusada0.2-dev 0.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- D_Bus/Ada - An Ada binding to D-Bus
--
-- Copyright (C) 2011 Reto Buerki <reet@codelabs.ch>
--
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- as published by the Free Software Foundation; either version 2
-- of the License, or (at your option) any later version.
--
-- This program 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 General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-- USA.
--
-- As a special exception, if other files instantiate generics from this
-- unit, or you link this unit with other files to produce an
-- executable this unit does not by itself cause the resulting
-- executable to be covered by the GNU General Public License. This
-- exception does not however invalidate any other reasons why the
-- executable file might be covered by the GNU Public License.
--
with Interfaces.C.Strings;
with dbus_bus_h;
with dbus_shared_h;
with dbus_errors_h;
with dbus_connection_h;
with dbus_message_h;
with dbus_types_h;
with dbus_arch_deps_h;
package body D_Bus.Connection is
package C renames Interfaces.C;
Bus_Types : constant array (Bus_Type) of dbus_shared_h.DBusBusType
:= (Bus_Session => dbus_shared_h.DBUS_BUS_SESSION,
Bus_System => dbus_shared_h.DBUS_BUS_SYSTEM,
Bus_Starter => dbus_shared_h.DBUS_BUS_STARTER);
-- Mapping of Ada bus type enum to low-level D-Bus bus types.
procedure Check (Result : access dbus_errors_h.DBusError);
-- Check D-Bus error object and raise an exception if error is set. The
-- D-Bus error object is freed before the exception is raised.
procedure Add_Args
(D_Message : System.Address;
Args : Arguments.Argument_List_Type);
-- Add arguments to low-level D-Bus message.
-------------------------------------------------------------------------
procedure Add_Args
(D_Message : System.Address;
Args : Arguments.Argument_List_Type)
is
D_Args : aliased dbus_message_h.DBusMessageIter;
begin
dbus_message_h.dbus_message_iter_init_append
(arg1 => D_Message,
arg2 => D_Args'Access);
Arguments.Serialize
(Args => Args,
D_Args => D_Args'Access);
end Add_Args;
-------------------------------------------------------------------------
procedure Add_Match
(Connection : Connection_Type;
Rule : String)
is
D_Err : aliased dbus_errors_h.DBusError;
C_Str : C.Strings.chars_ptr := C.Strings.New_String
(Str => Rule);
begin
dbus_bus_h.dbus_bus_add_match
(arg1 => Connection.Thin_Connection,
arg2 => C_Str,
arg3 => D_Err'Access);
C.Strings.Free (Item => C_Str);
Check (Result => D_Err'Access);
end Add_Match;
-------------------------------------------------------------------------
function Call_Blocking
(Connection : Connection_Type;
Destination : String;
Path : String;
Iface : String;
Method : String;
Args : Arguments.Argument_List_Type :=
Arguments.Empty_Argument_List)
return Arguments.Argument_List_Type
is
use type System.Address;
use type C.int;
D_Msg : System.Address := System.Null_Address;
D_Reply : System.Address := System.Null_Address;
D_Err : aliased dbus_errors_h.DBusError;
C_Dest : C.Strings.chars_ptr;
C_Path : C.Strings.chars_ptr;
C_Iface : C.Strings.chars_ptr;
C_Method : C.Strings.chars_ptr;
----------------------------------------------------------------------
procedure Free_Strings;
-- Free allocated memory.
procedure Free_Strings
is
begin
C.Strings.Free (Item => C_Dest);
C.Strings.Free (Item => C_Path);
C.Strings.Free (Item => C_Iface);
C.Strings.Free (Item => C_Method);
end Free_Strings;
begin
C_Dest := C.Strings.New_String (Str => Destination);
C_Path := C.Strings.New_String (Str => Path);
C_Iface := C.Strings.New_String (Str => Iface);
C_Method := C.Strings.New_String (Str => Method);
D_Msg := dbus_message_h.dbus_message_new_method_call
(arg1 => C_Dest,
arg2 => C_Path,
arg3 => C_Iface,
arg4 => C_Method);
Free_Strings;
if D_Msg = System.Null_Address then
raise D_Bus_Error with "Could not allocate message";
end if;
Add_Args (D_Message => D_Msg,
Args => Args);
D_Reply := dbus_connection_h.dbus_connection_send_with_reply_and_block
(arg1 => Connection.Thin_Connection,
arg2 => D_Msg,
arg3 => -1,
arg4 => D_Err'Access);
dbus_message_h.dbus_message_unref (arg1 => D_Msg);
D_Msg := System.Null_Address;
if D_Reply = System.Null_Address then
Check (Result => D_Err'Access);
end if;
declare
use type dbus_types_h.dbus_bool_t;
D_Args : aliased dbus_message_h.DBusMessageIter;
begin
if dbus_message_h.dbus_message_iter_init
(arg1 => D_Reply,
arg2 => D_Args'Access) = 0
then
dbus_message_h.dbus_message_unref (arg1 => D_Reply);
return Arguments.Empty_Argument_List;
end if;
return A : Arguments.Argument_List_Type do
A := Arguments.Deserialize (D_Args => D_Args'Access);
dbus_message_h.dbus_message_unref (arg1 => D_Reply);
end return;
end;
end Call_Blocking;
-------------------------------------------------------------------------
procedure Check (Result : access dbus_errors_h.DBusError)
is
use type dbus_types_h.dbus_bool_t;
begin
if dbus_errors_h.dbus_error_is_set (arg1 => Result) = 1 then
declare
Error_String : constant String := C.Strings.Value (Result.message);
begin
dbus_errors_h.dbus_error_free (arg1 => Result);
raise D_Bus_Error with Error_String;
end;
end if;
end Check;
-------------------------------------------------------------------------
function Connect (Bus : Bus_Type := Bus_Session) return Connection_Type
is
D_Conn : System.Address := System.Null_Address;
D_Err : aliased dbus_errors_h.DBusError;
begin
D_Conn := dbus_bus_h.dbus_bus_get
(arg1 => Bus_Types (Bus),
arg2 => D_Err'Access);
Check (Result => D_Err'Access);
return Connection_Type'(Thin_Connection => D_Conn);
end Connect;
-------------------------------------------------------------------------
function Connect (Address : String) return Connection_Type
is
C_Addr : C.Strings.chars_ptr := C.Strings.New_String (Str => Address);
D_Conn : System.Address := System.Null_Address;
D_Err : aliased dbus_errors_h.DBusError;
begin
D_Conn := dbus_connection_h.dbus_connection_open
(arg1 => C_Addr,
arg2 => D_Err'Access);
C.Strings.Free (Item => C_Addr);
Check (Result => D_Err'Access);
return Connection_Type'(Thin_Connection => D_Conn);
end Connect;
-------------------------------------------------------------------------
procedure Dispatch
(Connection : Connection_Type;
Callback : Callbacks.Message_Callback)
is
use type C.int;
use type dbus_types_h.dbus_bool_t;
function Call_Back
(D_Conn : System.Address;
Msg : System.Address;
Usr_Data : System.Address)
return dbus_shared_h.DBusHandlerResult;
-- Dispatch deserialized message to given callback procedure.
function Call_Back
(D_Conn : System.Address;
Msg : System.Address;
Usr_Data : System.Address)
return dbus_shared_h.DBusHandlerResult
is
pragma Unreferenced (D_Conn, Usr_Data);
begin
Callback (Msg => Messages.Create (D_Msg => Msg));
return dbus_shared_h.DBUS_HANDLER_RESULT_HANDLED;
end Call_Back;
procedure Free_Usr_Data (arg1 : System.Address) is null;
D_Res : dbus_types_h.dbus_bool_t;
begin
D_Res := dbus_connection_h.dbus_connection_add_filter
(arg1 => Connection.Thin_Connection,
arg2 => Call_Back'Access,
arg3 => System.Null_Address,
arg4 => Free_Usr_Data'Access);
if D_Res = 0 then
raise D_Bus_Error with "Could not add connection filter";
end if;
while dbus_connection_h.dbus_connection_read_write_dispatch
(arg1 => Connection.Thin_Connection,
arg2 => -1) = 1
loop
null;
end loop;
end Dispatch;
-------------------------------------------------------------------------
procedure Request_Name
(Connection : Connection_Type;
Name : String)
is
use type C.int;
use type C.unsigned;
C_Res : C.int;
C_Name : C.Strings.chars_ptr := C.Strings.New_String (Str => Name);
D_Err : aliased dbus_errors_h.DBusError;
begin
C_Res := dbus_bus_h.dbus_bus_request_name
(arg1 => Connection.Thin_Connection,
arg2 => C_Name,
arg3 => dbus_shared_h.DBUS_NAME_FLAG_REPLACE_EXISTING,
arg4 => D_Err'Access);
C.Strings.Free (Item => C_Name);
Check (Result => D_Err'Access);
if C_Res /= dbus_shared_h.DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER then
raise D_Bus_Error with "Not primary owner for '"
& Name & "' (" & C_Res'Img & ")";
end if;
end Request_Name;
-------------------------------------------------------------------------
procedure Send
(Connection : Connection_Type;
Message : Messages.Message_Type)
is
use type dbus_types_h.dbus_bool_t;
D_Serial : aliased dbus_arch_deps_h.dbus_uint32_t := 0;
begin
if dbus_connection_h.dbus_connection_send
(arg1 => Connection.Thin_Connection,
arg2 => Messages.To_Thin (Msg => Message),
arg3 => D_Serial'Access) = 0
then
raise D_Bus_Error with "Could not send message: out of memory";
end if;
end Send;
-------------------------------------------------------------------------
procedure Send_Signal
(Connection : Connection_Type;
Object_Name : String;
Iface : String;
Name : String;
Args : Arguments.Argument_List_Type :=
Arguments.Empty_Argument_List)
is
use type System.Address;
D_Msg : System.Address := System.Null_Address;
C_Object : C.Strings.chars_ptr;
C_Iface : C.Strings.chars_ptr;
C_Name : C.Strings.chars_ptr;
----------------------------------------------------------------------
procedure Free_Strings;
-- Free allocated memory.
procedure Free_Strings
is
begin
C.Strings.Free (Item => C_Object);
C.Strings.Free (Item => C_Iface);
C.Strings.Free (Item => C_Name);
end Free_Strings;
begin
C_Object := C.Strings.New_String (Str => Object_Name);
C_Iface := C.Strings.New_String (Str => Iface);
C_Name := C.Strings.New_String (Str => Name);
D_Msg := dbus_message_h.dbus_message_new_signal
(arg1 => C_Object,
arg2 => C_Iface,
arg3 => C_Name);
if D_Msg = System.Null_Address then
Free_Strings;
raise D_Bus_Error with "Could not allocate message";
end if;
begin
Add_Args (D_Message => D_Msg,
Args => Args);
exception
when D_Bus_Error =>
Free_Strings;
raise;
end;
declare
use type C.unsigned;
D_Serial : aliased dbus_arch_deps_h.dbus_uint32_t := 0;
begin
if dbus_connection_h.dbus_connection_send
(arg1 => Connection.Thin_Connection,
arg2 => D_Msg,
arg3 => D_Serial'Access) = 0
then
Free_Strings;
raise D_Bus_Error with "Could not send signal";
end if;
end;
Free_Strings;
dbus_message_h.dbus_message_unref (arg1 => D_Msg);
end Send_Signal;
end D_Bus.Connection;
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