1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- G N A T . S O C K E T S . T H I N --
9 -- Copyright (C) 2001-2009, 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 is the version for OpenVMS
36 with GNAT.OS_Lib; use GNAT.OS_Lib;
39 with Interfaces.C; use Interfaces.C;
41 package body GNAT.Sockets.Thin is
43 type VMS_Msghdr is new Msghdr;
44 pragma Pack (VMS_Msghdr);
45 -- On VMS (unlike other platforms), struct msghdr is packed, so a specific
46 -- derived type is required.
48 Non_Blocking_Sockets : aliased Fd_Set;
49 -- When this package is initialized with Process_Blocking_IO set to True,
50 -- sockets are set in non-blocking mode to avoid blocking the whole process
51 -- when a thread wants to perform a blocking IO operation. But the user can
52 -- also set a socket in non-blocking mode by purpose. In order to make a
53 -- difference between these two situations, we track the origin of
54 -- non-blocking mode in Non_Blocking_Sockets. Note that if S is in
55 -- Non_Blocking_Sockets, it has 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 to non-blocking
59 -- mode and we spend a period of time Quantum between two attempts on a
60 -- blocking operation.
62 Unknown_System_Error : constant C.Strings.chars_ptr :=
63 C.Strings.New_String ("Unknown system error");
65 function Syscall_Accept
67 Addr : System.Address;
68 Addrlen : not null access C.int) return C.int;
69 pragma Import (C, Syscall_Accept, "accept");
71 function Syscall_Connect
73 Name : System.Address;
74 Namelen : C.int) return C.int;
75 pragma Import (C, Syscall_Connect, "connect");
81 Flags : C.int) return C.int;
82 pragma Import (C, Syscall_Recv, "recv");
84 function Syscall_Recvfrom
89 From : System.Address;
90 Fromlen : not null access C.int) return C.int;
91 pragma Import (C, Syscall_Recvfrom, "recvfrom");
93 function Syscall_Recvmsg
96 Flags : C.int) return C.int;
97 pragma Import (C, Syscall_Recvmsg, "recvmsg");
99 function Syscall_Sendmsg
101 Msg : System.Address;
102 Flags : C.int) return C.int;
103 pragma Import (C, Syscall_Sendmsg, "sendmsg");
105 function Syscall_Sendto
107 Msg : System.Address;
111 Tolen : C.int) return C.int;
112 pragma Import (C, Syscall_Sendto, "sendto");
114 function Syscall_Socket
115 (Domain, Typ, Protocol : C.int) return C.int;
116 pragma Import (C, Syscall_Socket, "socket");
118 function Non_Blocking_Socket (S : C.int) return Boolean;
119 procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean);
127 Addr : System.Address;
128 Addrlen : not null access C.int) return C.int
131 Val : aliased C.int := 1;
134 pragma Warnings (Off, Discard);
138 R := Syscall_Accept (S, Addr, Addrlen);
139 exit when SOSC.Thread_Blocking_IO
141 or else Non_Blocking_Socket (S)
142 or else Errno /= SOSC.EWOULDBLOCK;
146 if not SOSC.Thread_Blocking_IO
147 and then R /= Failure
149 -- A socket inherits the properties of its server, especially
150 -- the FIONBIO flag. Do not use Socket_Ioctl as this subprogram
151 -- tracks sockets set in non-blocking mode by user.
153 Set_Non_Blocking_Socket (R, Non_Blocking_Socket (S));
154 Discard := C_Ioctl (R, SOSC.FIONBIO, Val'Access);
166 Name : System.Address;
167 Namelen : C.int) return C.int
172 Res := Syscall_Connect (S, Name, Namelen);
174 if SOSC.Thread_Blocking_IO
175 or else Res /= Failure
176 or else Non_Blocking_Socket (S)
177 or else Errno /= SOSC.EINPROGRESS
183 WSet : aliased Fd_Set;
184 Now : aliased Timeval;
187 Reset_Socket_Set (WSet'Access);
189 Insert_Socket_In_Set (WSet'Access, S);
196 Now'Unchecked_Access);
200 if Res = Failure then
208 Res := Syscall_Connect (S, Name, Namelen);
210 if Res = Failure and then Errno = SOSC.EISCONN then
211 return Thin_Common.Success;
221 function Socket_Ioctl
224 Arg : access C.int) return C.int
227 if not SOSC.Thread_Blocking_IO and then Req = SOSC.FIONBIO then
229 Set_Non_Blocking_Socket (S, True);
233 return C_Ioctl (S, Req, Arg);
242 Msg : System.Address;
244 Flags : C.int) return C.int
250 Res := Syscall_Recv (S, Msg, Len, Flags);
251 exit when SOSC.Thread_Blocking_IO
252 or else Res /= Failure
253 or else Non_Blocking_Socket (S)
254 or else Errno /= SOSC.EWOULDBLOCK;
267 Msg : System.Address;
270 From : System.Address;
271 Fromlen : not null access C.int) return C.int
277 Res := Syscall_Recvfrom (S, Msg, Len, Flags, From, Fromlen);
278 exit when SOSC.Thread_Blocking_IO
279 or else Res /= Failure
280 or else Non_Blocking_Socket (S)
281 or else Errno /= SOSC.EWOULDBLOCK;
294 Msg : System.Address;
295 Flags : C.int) return ssize_t
300 for GNAT_Msg'Address use Msg;
301 pragma Import (Ada, GNAT_Msg);
303 VMS_Msg : aliased VMS_Msghdr := VMS_Msghdr (GNAT_Msg);
307 Res := Syscall_Recvmsg (S, VMS_Msg'Address, Flags);
308 exit when SOSC.Thread_Blocking_IO
309 or else Res /= Failure
310 or else Non_Blocking_Socket (S)
311 or else Errno /= SOSC.EWOULDBLOCK;
315 GNAT_Msg := Msghdr (VMS_Msg);
317 return ssize_t (Res);
326 Msg : System.Address;
327 Flags : C.int) return ssize_t
332 for GNAT_Msg'Address use Msg;
333 pragma Import (Ada, GNAT_Msg);
335 VMS_Msg : aliased VMS_Msghdr := VMS_Msghdr (GNAT_Msg);
339 Res := Syscall_Sendmsg (S, VMS_Msg'Address, Flags);
340 exit when SOSC.Thread_Blocking_IO
341 or else Res /= Failure
342 or else Non_Blocking_Socket (S)
343 or else Errno /= SOSC.EWOULDBLOCK;
347 GNAT_Msg := Msghdr (VMS_Msg);
349 return ssize_t (Res);
358 Msg : System.Address;
362 Tolen : C.int) return C.int
368 Res := Syscall_Sendto (S, Msg, Len, Flags, To, Tolen);
369 exit when SOSC.Thread_Blocking_IO
370 or else Res /= Failure
371 or else Non_Blocking_Socket (S)
372 or else Errno /= SOSC.EWOULDBLOCK;
386 Protocol : C.int) return C.int
389 Val : aliased C.int := 1;
392 pragma Unreferenced (Discard);
395 R := Syscall_Socket (Domain, Typ, Protocol);
397 if not SOSC.Thread_Blocking_IO
398 and then R /= Failure
400 -- Do not use Socket_Ioctl as this subprogram tracks sockets set
401 -- in non-blocking mode by user.
403 Discard := C_Ioctl (R, SOSC.FIONBIO, Val'Access);
404 Set_Non_Blocking_Socket (R, False);
414 procedure Finalize is
419 -------------------------
420 -- Host_Error_Messages --
421 -------------------------
423 package body Host_Error_Messages is separate;
429 procedure Initialize is
431 Reset_Socket_Set (Non_Blocking_Sockets'Access);
434 -------------------------
435 -- Non_Blocking_Socket --
436 -------------------------
438 function Non_Blocking_Socket (S : C.int) return Boolean is
442 R := (Is_Socket_In_Set (Non_Blocking_Sockets'Access, S) /= 0);
445 end Non_Blocking_Socket;
447 -----------------------------
448 -- Set_Non_Blocking_Socket --
449 -----------------------------
451 procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean) is
456 Insert_Socket_In_Set (Non_Blocking_Sockets'Access, S);
458 Remove_Socket_From_Set (Non_Blocking_Sockets'Access, S);
462 end Set_Non_Blocking_Socket;
468 package body Signalling_Fds is separate;
470 --------------------------
471 -- Socket_Error_Message --
472 --------------------------
474 function Socket_Error_Message
475 (Errno : Integer) return C.Strings.chars_ptr
478 end GNAT.Sockets.Thin;