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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- G N A T . S O C K E T S . T H I N --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2002-2009, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package provides a target dependent thin interface to the sockets
+-- layer for use by the GNAT.Sockets package (g-socket.ads). This package
+-- should not be directly with'ed by an applications program.
+
+-- This version is for VxWorks
+
+with GNAT.OS_Lib; use GNAT.OS_Lib;
+with GNAT.Task_Lock;
+
+with Interfaces.C; use Interfaces.C;
+
+package body GNAT.Sockets.Thin is
+
+ Non_Blocking_Sockets : aliased Fd_Set;
+ -- When this package is initialized with Process_Blocking_IO set
+ -- to True, sockets are set in non-blocking mode to avoid blocking
+ -- the whole process when a thread wants to perform a blocking IO
+ -- operation. But the user can also set a socket in non-blocking
+ -- mode by purpose. In order to make a difference between these
+ -- two situations, we track the origin of non-blocking mode in
+ -- Non_Blocking_Sockets. If S is in Non_Blocking_Sockets, it has
+ -- been set in non-blocking mode by the user.
+
+ Quantum : constant Duration := 0.2;
+ -- When SOSC.Thread_Blocking_IO is False, we set sockets in
+ -- non-blocking mode and we spend a period of time Quantum between
+ -- two attempts on a blocking operation.
+
+ Unknown_System_Error : constant C.Strings.chars_ptr :=
+ C.Strings.New_String ("Unknown system error");
+
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
+
+ -- All these require comments ???
+
+ function Syscall_Accept
+ (S : C.int;
+ Addr : System.Address;
+ Addrlen : not null access C.int) return C.int;
+ pragma Import (C, Syscall_Accept, "accept");
+
+ function Syscall_Connect
+ (S : C.int;
+ Name : System.Address;
+ Namelen : C.int) return C.int;
+ pragma Import (C, Syscall_Connect, "connect");
+
+ function Syscall_Recv
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int) return C.int;
+ pragma Import (C, Syscall_Recv, "recv");
+
+ function Syscall_Recvfrom
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int;
+ From : System.Address;
+ Fromlen : not null access C.int) return C.int;
+ pragma Import (C, Syscall_Recvfrom, "recvfrom");
+
+ function Syscall_Recvmsg
+ (S : C.int;
+ Msg : System.Address;
+ Flags : C.int) return C.int;
+ pragma Import (C, Syscall_Recvmsg, "recvmsg");
+
+ function Syscall_Sendmsg
+ (S : C.int;
+ Msg : System.Address;
+ Flags : C.int) return C.int;
+ pragma Import (C, Syscall_Sendmsg, "sendmsg");
+
+ function Syscall_Send
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int) return C.int;
+ pragma Import (C, Syscall_Send, "send");
+
+ function Syscall_Sendto
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int;
+ To : System.Address;
+ Tolen : C.int) return C.int;
+ pragma Import (C, Syscall_Sendto, "sendto");
+
+ function Syscall_Socket
+ (Domain : C.int;
+ Typ : C.int;
+ Protocol : C.int) return C.int;
+ pragma Import (C, Syscall_Socket, "socket");
+
+ function Non_Blocking_Socket (S : C.int) return Boolean;
+ procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean);
+
+ --------------
+ -- C_Accept --
+ --------------
+
+ function C_Accept
+ (S : C.int;
+ Addr : System.Address;
+ Addrlen : not null access C.int) return C.int
+ is
+ R : C.int;
+ Val : aliased C.int := 1;
+
+ Res : C.int;
+ pragma Unreferenced (Res);
+
+ begin
+ loop
+ R := Syscall_Accept (S, Addr, Addrlen);
+ exit when SOSC.Thread_Blocking_IO
+ or else R /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EWOULDBLOCK;
+ delay Quantum;
+ end loop;
+
+ if not SOSC.Thread_Blocking_IO
+ and then R /= Failure
+ then
+ -- A socket inherits the properties of its server especially
+ -- the FIONBIO flag. Do not use Socket_Ioctl as this subprogram
+ -- tracks sockets set in non-blocking mode by user.
+
+ Set_Non_Blocking_Socket (R, Non_Blocking_Socket (S));
+ Res := C_Ioctl (R, SOSC.FIONBIO, Val'Access);
+ -- Is it OK to ignore result ???
+ end if;
+
+ return R;
+ end C_Accept;
+
+ ---------------
+ -- C_Connect --
+ ---------------
+
+ function C_Connect
+ (S : C.int;
+ Name : System.Address;
+ Namelen : C.int) return C.int
+ is
+ Res : C.int;
+
+ begin
+ Res := Syscall_Connect (S, Name, Namelen);
+
+ if SOSC.Thread_Blocking_IO
+ or else Res /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EINPROGRESS
+ then
+ return Res;
+ end if;
+
+ declare
+ WSet : aliased Fd_Set;
+ Now : aliased Timeval;
+ begin
+ Reset_Socket_Set (WSet'Access);
+ loop
+ Insert_Socket_In_Set (WSet'Access, S);
+ Now := Immediat;
+ Res := C_Select
+ (S + 1,
+ No_Fd_Set_Access,
+ WSet'Access,
+ No_Fd_Set_Access,
+ Now'Unchecked_Access);
+
+ exit when Res > 0;
+
+ if Res = Failure then
+ return Res;
+ end if;
+
+ delay Quantum;
+ end loop;
+ end;
+
+ Res := Syscall_Connect (S, Name, Namelen);
+
+ if Res = Failure
+ and then Errno = SOSC.EISCONN
+ then
+ return Thin_Common.Success;
+ else
+ return Res;
+ end if;
+ end C_Connect;
+
+ ------------------
+ -- Socket_Ioctl --
+ ------------------
+
+ function Socket_Ioctl
+ (S : C.int;
+ Req : C.int;
+ Arg : access C.int) return C.int
+ is
+ begin
+ if not SOSC.Thread_Blocking_IO and then Req = SOSC.FIONBIO then
+ if Arg.all /= 0 then
+ Set_Non_Blocking_Socket (S, True);
+ end if;
+ end if;
+
+ return C_Ioctl (S, Req, Arg);
+ end Socket_Ioctl;
+
+ ------------
+ -- C_Recv --
+ ------------
+
+ function C_Recv
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int) return C.int
+ is
+ Res : C.int;
+
+ begin
+ loop
+ Res := Syscall_Recv (S, Msg, Len, Flags);
+ exit when SOSC.Thread_Blocking_IO
+ or else Res /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EWOULDBLOCK;
+ delay Quantum;
+ end loop;
+
+ return Res;
+ end C_Recv;
+
+ ----------------
+ -- C_Recvfrom --
+ ----------------
+
+ function C_Recvfrom
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int;
+ From : System.Address;
+ Fromlen : not null access C.int) return C.int
+ is
+ Res : C.int;
+
+ begin
+ loop
+ Res := Syscall_Recvfrom (S, Msg, Len, Flags, From, Fromlen);
+ exit when SOSC.Thread_Blocking_IO
+ or else Res /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EWOULDBLOCK;
+ delay Quantum;
+ end loop;
+
+ return Res;
+ end C_Recvfrom;
+
+ ---------------
+ -- C_Recvmsg --
+ ---------------
+
+ function C_Recvmsg
+ (S : C.int;
+ Msg : System.Address;
+ Flags : C.int) return System.CRTL.ssize_t
+ is
+ Res : C.int;
+
+ begin
+ loop
+ Res := Syscall_Recvmsg (S, Msg, Flags);
+ exit when SOSC.Thread_Blocking_IO
+ or else Res /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EWOULDBLOCK;
+ delay Quantum;
+ end loop;
+
+ return System.CRTL.ssize_t (Res);
+ end C_Recvmsg;
+
+ ---------------
+ -- C_Sendmsg --
+ ---------------
+
+ function C_Sendmsg
+ (S : C.int;
+ Msg : System.Address;
+ Flags : C.int) return System.CRTL.ssize_t
+ is
+ Res : C.int;
+
+ begin
+ loop
+ Res := Syscall_Sendmsg (S, Msg, Flags);
+ exit when SOSC.Thread_Blocking_IO
+ or else Res /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EWOULDBLOCK;
+ delay Quantum;
+ end loop;
+
+ return System.CRTL.ssize_t (Res);
+ end C_Sendmsg;
+
+ --------------
+ -- C_Sendto --
+ --------------
+
+ function C_Sendto
+ (S : C.int;
+ Msg : System.Address;
+ Len : C.int;
+ Flags : C.int;
+ To : System.Address;
+ Tolen : C.int) return C.int
+ is
+ use System;
+
+ Res : C.int;
+
+ begin
+ loop
+ if To = Null_Address then
+
+ -- In violation of the standard sockets API, VxWorks does not
+ -- support sendto(2) calls on connected sockets with a null
+ -- destination address, so use send(2) instead in that case.
+
+ Res := Syscall_Send (S, Msg, Len, Flags);
+
+ -- Normal case where destination address is non-null
+
+ else
+ Res := Syscall_Sendto (S, Msg, Len, Flags, To, Tolen);
+ end if;
+
+ exit when SOSC.Thread_Blocking_IO
+ or else Res /= Failure
+ or else Non_Blocking_Socket (S)
+ or else Errno /= SOSC.EWOULDBLOCK;
+ delay Quantum;
+ end loop;
+
+ return Res;
+ end C_Sendto;
+
+ --------------
+ -- C_Socket --
+ --------------
+
+ function C_Socket
+ (Domain : C.int;
+ Typ : C.int;
+ Protocol : C.int) return C.int
+ is
+ R : C.int;
+ Val : aliased C.int := 1;
+
+ Res : C.int;
+ pragma Unreferenced (Res);
+
+ begin
+ R := Syscall_Socket (Domain, Typ, Protocol);
+
+ if not SOSC.Thread_Blocking_IO
+ and then R /= Failure
+ then
+ -- Do not use Socket_Ioctl as this subprogram tracks sockets set
+ -- in non-blocking mode by user.
+
+ Res := C_Ioctl (R, SOSC.FIONBIO, Val'Access);
+ -- Is it OK to ignore result ???
+ Set_Non_Blocking_Socket (R, False);
+ end if;
+
+ return R;
+ end C_Socket;
+
+ --------------
+ -- Finalize --
+ --------------
+
+ procedure Finalize is
+ begin
+ null;
+ end Finalize;
+
+ -------------------------
+ -- Host_Error_Messages --
+ -------------------------
+
+ package body Host_Error_Messages is separate;
+
+ ----------------
+ -- Initialize --
+ ----------------
+
+ procedure Initialize is
+ begin
+ Reset_Socket_Set (Non_Blocking_Sockets'Access);
+ end Initialize;
+
+ -------------------------
+ -- Non_Blocking_Socket --
+ -------------------------
+
+ function Non_Blocking_Socket (S : C.int) return Boolean is
+ R : Boolean;
+ begin
+ Task_Lock.Lock;
+ R := (Is_Socket_In_Set (Non_Blocking_Sockets'Access, S) /= 0);
+ Task_Lock.Unlock;
+ return R;
+ end Non_Blocking_Socket;
+
+ -----------------------------
+ -- Set_Non_Blocking_Socket --
+ -----------------------------
+
+ procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean) is
+ begin
+ Task_Lock.Lock;
+ if V then
+ Insert_Socket_In_Set (Non_Blocking_Sockets'Access, S);
+ else
+ Remove_Socket_From_Set (Non_Blocking_Sockets'Access, S);
+ end if;
+
+ Task_Lock.Unlock;
+ end Set_Non_Blocking_Socket;
+
+ --------------------
+ -- Signalling_Fds --
+ --------------------
+
+ package body Signalling_Fds is separate;
+
+ --------------------------
+ -- Socket_Error_Message --
+ --------------------------
+
+ function Socket_Error_Message
+ (Errno : Integer) return C.Strings.chars_ptr
+ is separate;
+
+end GNAT.Sockets.Thin;
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