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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- G N A T . S O C K E T S . T H I N . S I G N A L L I N G _ F D S --
--- --
--- B o d y --
--- --
--- Copyright (C) 2001-2008, AdaCore --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT 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 distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 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. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- Portable sockets-based implementation of GNAT.Sockets.Thin.Signalling_Fds
--- used for platforms that do not support UNIX pipes.
-
--- Note: this code used to be in GNAT.Sockets, but has been moved to a
--- platform-specific file. It is now used only for non-UNIX platforms.
-
-separate (GNAT.Sockets.Thin)
-package body Signalling_Fds is
-
- -----------
- -- Close --
- -----------
-
- procedure Close (Sig : C.int) is
- Res : C.int;
- pragma Unreferenced (Res);
- -- Res is assigned but never read, because we purposefully ignore
- -- any error returned by the C_Close system call, as per the spec
- -- of this procedure.
- begin
- Res := C_Close (Sig);
- end Close;
-
- ------------
- -- Create --
- ------------
-
- function Create (Fds : not null access Fd_Pair) return C.int is
- L_Sock, R_Sock, W_Sock : C.int := Failure;
- -- Listening socket, read socket and write socket
-
- Sin : aliased Sockaddr_In;
- Len : aliased C.int;
- -- Address of listening socket
-
- Res : C.int;
- -- Return status of system calls
-
- begin
- Fds.all := (Read_End | Write_End => Failure);
-
- -- We open two signalling sockets. One of them is used to send data
- -- to the other, which is included in a C_Select socket set. The
- -- communication is used to force the call to C_Select to complete,
- -- and the waiting task to resume its execution.
-
- loop
- -- Retry loop, in case the C_Connect below fails
-
- -- Create a listening socket
-
- L_Sock := C_Socket (SOSC.AF_INET, SOSC.SOCK_STREAM, 0);
-
- if L_Sock = Failure then
- goto Fail;
- end if;
-
- -- Bind the socket to an available port on localhost
-
- Set_Family (Sin.Sin_Family, Family_Inet);
- Sin.Sin_Addr.S_B1 := 127;
- Sin.Sin_Addr.S_B2 := 0;
- Sin.Sin_Addr.S_B3 := 0;
- Sin.Sin_Addr.S_B4 := 1;
- Sin.Sin_Port := 0;
-
- Len := C.int (Lengths (Family_Inet));
- Res := C_Bind (L_Sock, Sin'Address, Len);
-
- if Res = Failure then
- goto Fail;
- end if;
-
- -- Get assigned port
-
- Res := C_Getsockname (L_Sock, Sin'Address, Len'Access);
- if Res = Failure then
- goto Fail;
- end if;
-
- -- Set socket to listen mode, with a backlog of 1 to guarantee that
- -- exactly one call to connect(2) succeeds.
-
- Res := C_Listen (L_Sock, 1);
-
- if Res = Failure then
- goto Fail;
- end if;
-
- -- Create read end (client) socket
-
- R_Sock := C_Socket (SOSC.AF_INET, SOSC.SOCK_STREAM, 0);
-
- if R_Sock = Failure then
- goto Fail;
- end if;
-
- -- Connect listening socket
-
- Res := C_Connect (R_Sock, Sin'Address, Len);
-
- exit when Res /= Failure;
-
- if Socket_Errno /= SOSC.EADDRINUSE then
- goto Fail;
- end if;
-
- -- In rare cases, the above C_Bind chooses a port that is still
- -- marked "in use", even though it has been closed (perhaps by some
- -- other process that has already exited). This causes the above
- -- C_Connect to fail with EADDRINUSE. In this case, we close the
- -- ports, and loop back to try again. This mysterious Windows
- -- behavior is documented. See, for example:
- -- http://msdn2.microsoft.com/en-us/library/ms737625.aspx
- -- In an experiment with 2000 calls, 21 required exactly one retry, 7
- -- required two, and none required three or more. Note that no delay
- -- is needed between retries; retrying C_Bind will typically produce
- -- a different port.
-
- pragma Assert (Res = Failure
- and then
- Socket_Errno = SOSC.EADDRINUSE);
- pragma Warnings (Off); -- useless assignment to "Res"
- Res := C_Close (W_Sock);
- pragma Warnings (On);
- W_Sock := Failure;
- Res := C_Close (R_Sock);
- R_Sock := Failure;
- end loop;
-
- -- Since the call to connect(2) has succeeded and the backlog limit on
- -- the listening socket is 1, we know that there is now exactly one
- -- pending connection on L_Sock, which is the one from R_Sock.
-
- W_Sock := C_Accept (L_Sock, Sin'Address, Len'Access);
-
- if W_Sock = Failure then
- goto Fail;
- end if;
-
- -- Set TCP_NODELAY on W_Sock, since we always want to send the data out
- -- immediately.
-
- Set_Socket_Option
- (Socket => Socket_Type (W_Sock),
- Level => IP_Protocol_For_TCP_Level,
- Option => (Name => No_Delay, Enabled => True));
-
- -- Close listening socket (ignore exit status)
-
- Res := C_Close (L_Sock);
-
- Fds.all := (Read_End => R_Sock, Write_End => W_Sock);
-
- return Thin_Common.Success;
-
- <<Fail>>
- declare
- Saved_Errno : constant Integer := Socket_Errno;
-
- begin
- if W_Sock /= Failure then
- Res := C_Close (W_Sock);
- end if;
-
- if R_Sock /= Failure then
- Res := C_Close (R_Sock);
- end if;
-
- if L_Sock /= Failure then
- Res := C_Close (L_Sock);
- end if;
-
- Set_Socket_Errno (Saved_Errno);
- end;
-
- return Failure;
- end Create;
-
- ----------
- -- Read --
- ----------
-
- function Read (Rsig : C.int) return C.int is
- Buf : aliased Character;
- begin
- return C_Recv (Rsig, Buf'Address, 1, SOSC.MSG_Forced_Flags);
- end Read;
-
- -----------
- -- Write --
- -----------
-
- function Write (Wsig : C.int) return C.int is
- Buf : aliased Character := ASCII.NUL;
- begin
- return C_Send (Wsig, Buf'Address, 1, SOSC.MSG_Forced_Flags);
- end Write;
-
-end Signalling_Fds;