1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- G N A T . S O C K E T S . T H I N --
9 -- Copyright (C) 2002-2009, AdaCore --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This package provides a target dependent thin interface to the sockets
35 -- layer for use by the GNAT.Sockets package (g-socket.ads). This package
36 -- should not be directly with'ed by an applications program.
38 -- This version is for VxWorks
40 with GNAT.OS_Lib; use GNAT.OS_Lib;
43 with Interfaces.C; use Interfaces.C;
45 package body GNAT.Sockets.Thin is
47 Non_Blocking_Sockets : aliased Fd_Set;
48 -- When this package is initialized with Process_Blocking_IO set
49 -- to True, sockets are set in non-blocking mode to avoid blocking
50 -- the whole process when a thread wants to perform a blocking IO
51 -- operation. But the user can also set a socket in non-blocking
52 -- mode by purpose. In order to make a difference between these
53 -- two situations, we track the origin of non-blocking mode in
54 -- Non_Blocking_Sockets. If S is in Non_Blocking_Sockets, it has
55 -- been set in non-blocking mode by the user.
57 Quantum : constant Duration := 0.2;
58 -- When SOSC.Thread_Blocking_IO is False, we set sockets in
59 -- non-blocking mode and we spend a period of time Quantum between
60 -- two attempts on a blocking operation.
62 Unknown_System_Error : constant C.Strings.chars_ptr :=
63 C.Strings.New_String ("Unknown system error");
65 -----------------------
66 -- Local Subprograms --
67 -----------------------
69 -- All these require comments ???
71 function Syscall_Accept
73 Addr : System.Address;
74 Addrlen : not null access C.int) return C.int;
75 pragma Import (C, Syscall_Accept, "accept");
77 function Syscall_Connect
79 Name : System.Address;
80 Namelen : C.int) return C.int;
81 pragma Import (C, Syscall_Connect, "connect");
87 Flags : C.int) return C.int;
88 pragma Import (C, Syscall_Recv, "recv");
90 function Syscall_Recvfrom
95 From : System.Address;
96 Fromlen : not null access C.int) return C.int;
97 pragma Import (C, Syscall_Recvfrom, "recvfrom");
99 function Syscall_Recvmsg
101 Msg : System.Address;
102 Flags : C.int) return C.int;
103 pragma Import (C, Syscall_Recvmsg, "recvmsg");
105 function Syscall_Sendmsg
107 Msg : System.Address;
108 Flags : C.int) return C.int;
109 pragma Import (C, Syscall_Sendmsg, "sendmsg");
111 function Syscall_Send
113 Msg : System.Address;
115 Flags : C.int) return C.int;
116 pragma Import (C, Syscall_Send, "send");
118 function Syscall_Sendto
120 Msg : System.Address;
124 Tolen : C.int) return C.int;
125 pragma Import (C, Syscall_Sendto, "sendto");
127 function Syscall_Socket
130 Protocol : C.int) return C.int;
131 pragma Import (C, Syscall_Socket, "socket");
133 function Non_Blocking_Socket (S : C.int) return Boolean;
134 procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean);
142 Addr : System.Address;
143 Addrlen : not null access C.int) return C.int
146 Val : aliased C.int := 1;
149 pragma Unreferenced (Res);
153 R := Syscall_Accept (S, Addr, Addrlen);
154 exit when SOSC.Thread_Blocking_IO
156 or else Non_Blocking_Socket (S)
157 or else Errno /= SOSC.EWOULDBLOCK;
161 if not SOSC.Thread_Blocking_IO
162 and then R /= Failure
164 -- A socket inherits the properties of its server especially
165 -- the FIONBIO flag. Do not use Socket_Ioctl as this subprogram
166 -- tracks sockets set in non-blocking mode by user.
168 Set_Non_Blocking_Socket (R, Non_Blocking_Socket (S));
169 Res := C_Ioctl (R, SOSC.FIONBIO, Val'Access);
170 -- Is it OK to ignore result ???
182 Name : System.Address;
183 Namelen : C.int) return C.int
188 Res := Syscall_Connect (S, Name, Namelen);
190 if SOSC.Thread_Blocking_IO
191 or else Res /= Failure
192 or else Non_Blocking_Socket (S)
193 or else Errno /= SOSC.EINPROGRESS
199 WSet : aliased Fd_Set;
200 Now : aliased Timeval;
202 Reset_Socket_Set (WSet'Access);
204 Insert_Socket_In_Set (WSet'Access, S);
211 Now'Unchecked_Access);
215 if Res = Failure then
223 Res := Syscall_Connect (S, Name, Namelen);
226 and then Errno = SOSC.EISCONN
228 return Thin_Common.Success;
238 function Socket_Ioctl
241 Arg : access C.int) return C.int
244 if not SOSC.Thread_Blocking_IO and then Req = SOSC.FIONBIO then
246 Set_Non_Blocking_Socket (S, True);
250 return C_Ioctl (S, Req, Arg);
259 Msg : System.Address;
261 Flags : C.int) return C.int
267 Res := Syscall_Recv (S, Msg, Len, Flags);
268 exit when SOSC.Thread_Blocking_IO
269 or else Res /= Failure
270 or else Non_Blocking_Socket (S)
271 or else Errno /= SOSC.EWOULDBLOCK;
284 Msg : System.Address;
287 From : System.Address;
288 Fromlen : not null access C.int) return C.int
294 Res := Syscall_Recvfrom (S, Msg, Len, Flags, From, Fromlen);
295 exit when SOSC.Thread_Blocking_IO
296 or else Res /= Failure
297 or else Non_Blocking_Socket (S)
298 or else Errno /= SOSC.EWOULDBLOCK;
311 Msg : System.Address;
312 Flags : C.int) return ssize_t
318 Res := Syscall_Recvmsg (S, Msg, Flags);
319 exit when SOSC.Thread_Blocking_IO
320 or else Res /= Failure
321 or else Non_Blocking_Socket (S)
322 or else Errno /= SOSC.EWOULDBLOCK;
326 return ssize_t (Res);
335 Msg : System.Address;
336 Flags : C.int) return ssize_t
342 Res := Syscall_Sendmsg (S, Msg, Flags);
343 exit when SOSC.Thread_Blocking_IO
344 or else Res /= Failure
345 or else Non_Blocking_Socket (S)
346 or else Errno /= SOSC.EWOULDBLOCK;
350 return ssize_t (Res);
359 Msg : System.Address;
363 Tolen : C.int) return C.int
371 if To = Null_Address then
373 -- In violation of the standard sockets API, VxWorks does not
374 -- support sendto(2) calls on connected sockets with a null
375 -- destination address, so use send(2) instead in that case.
377 Res := Syscall_Send (S, Msg, Len, Flags);
379 -- Normal case where destination address is non-null
382 Res := Syscall_Sendto (S, Msg, Len, Flags, To, Tolen);
385 exit when SOSC.Thread_Blocking_IO
386 or else Res /= Failure
387 or else Non_Blocking_Socket (S)
388 or else Errno /= SOSC.EWOULDBLOCK;
402 Protocol : C.int) return C.int
405 Val : aliased C.int := 1;
408 pragma Unreferenced (Res);
411 R := Syscall_Socket (Domain, Typ, Protocol);
413 if not SOSC.Thread_Blocking_IO
414 and then R /= Failure
416 -- Do not use Socket_Ioctl as this subprogram tracks sockets set
417 -- in non-blocking mode by user.
419 Res := C_Ioctl (R, SOSC.FIONBIO, Val'Access);
420 -- Is it OK to ignore result ???
421 Set_Non_Blocking_Socket (R, False);
431 procedure Finalize is
436 -------------------------
437 -- Host_Error_Messages --
438 -------------------------
440 package body Host_Error_Messages is separate;
446 procedure Initialize is
448 Reset_Socket_Set (Non_Blocking_Sockets'Access);
451 -------------------------
452 -- Non_Blocking_Socket --
453 -------------------------
455 function Non_Blocking_Socket (S : C.int) return Boolean is
459 R := (Is_Socket_In_Set (Non_Blocking_Sockets'Access, S) /= 0);
462 end Non_Blocking_Socket;
464 -----------------------------
465 -- Set_Non_Blocking_Socket --
466 -----------------------------
468 procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean) is
472 Insert_Socket_In_Set (Non_Blocking_Sockets'Access, S);
474 Remove_Socket_From_Set (Non_Blocking_Sockets'Access, S);
478 end Set_Non_Blocking_Socket;
484 package body Signalling_Fds is separate;
486 --------------------------
487 -- Socket_Error_Message --
488 --------------------------
490 function Socket_Error_Message
491 (Errno : Integer) return C.Strings.chars_ptr
493 use type Interfaces.C.Strings.chars_ptr;
495 C_Msg : C.Strings.chars_ptr;
498 C_Msg := C_Strerror (C.int (Errno));
500 if C_Msg = C.Strings.Null_Ptr then
501 return Unknown_System_Error;
506 end Socket_Error_Message;
508 end GNAT.Sockets.Thin;