1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- G N A T . S O C K E T S . T H I N --
9 -- Copyright (C) 2002-2007, 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 is the Alpha/VMS version
40 with Interfaces.C.Pointers;
41 with Interfaces.C.Strings;
44 with GNAT.Sockets.Constants;
49 package GNAT.Sockets.Thin is
51 -- ??? more comments needed ???
53 package C renames Interfaces.C;
56 -- This is so we can declare the Failure constant below
58 Success : constant C.int := 0;
59 Failure : constant C.int := -1;
61 function Socket_Errno return Integer renames GNAT.OS_Lib.Errno;
62 -- Returns last socket error number
64 procedure Set_Socket_Errno (Errno : Integer) renames GNAT.OS_Lib.Set_Errno;
65 -- Set last socket error number
67 function Socket_Error_Message (Errno : Integer) return C.Strings.chars_ptr;
68 -- Returns the error message string for the error number Errno. If Errno is
69 -- not known, returns "Unknown system error".
71 function Host_Errno return Integer;
72 pragma Import (C, Host_Errno, "__gnat_get_h_errno");
73 -- Returns last host error number
75 package Host_Error_Messages is
77 function Host_Error_Message
78 (H_Errno : Integer) return C.Strings.chars_ptr;
79 -- Returns the error message string for the host error number H_Errno.
80 -- If H_Errno is not known, returns "Unknown system error".
82 end Host_Error_Messages;
84 subtype Fd_Set_Access is System.Aux_DEC.Short_Address;
85 No_Fd_Set : constant Fd_Set_Access := System.Null_Address;
88 range -2 ** (8 * Constants.SIZEOF_tv_sec - 1)
89 .. 2 ** (8 * Constants.SIZEOF_tv_sec - 1) - 1;
90 for time_t'Size use 8 * Constants.SIZEOF_tv_sec;
91 pragma Convention (C, time_t);
94 range -2 ** (8 * Constants.SIZEOF_tv_usec - 1)
95 .. 2 ** (8 * Constants.SIZEOF_tv_usec - 1) - 1;
96 for suseconds_t'Size use 8 * Constants.SIZEOF_tv_usec;
97 pragma Convention (C, suseconds_t);
99 type Timeval is record
101 Tv_Usec : suseconds_t;
103 pragma Convention (C, Timeval);
105 type Timeval_Access is access all Timeval;
106 pragma Convention (C, Timeval_Access);
108 Immediat : constant Timeval := (0, 0);
110 type Int_Access is access all C.int;
111 pragma Convention (C, Int_Access);
112 -- Access to C integers
114 type Chars_Ptr_Array is array (C.size_t range <>) of
115 aliased C.Strings.chars_ptr;
117 package Chars_Ptr_Pointers is
118 new C.Pointers (C.size_t, C.Strings.chars_ptr, Chars_Ptr_Array,
120 -- Arrays of C (char *)
122 type In_Addr is record
123 S_B1, S_B2, S_B3, S_B4 : C.unsigned_char;
125 for In_Addr'Alignment use C.int'Alignment;
126 pragma Convention (C, In_Addr);
127 -- IPv4 address, represented as a network-order C.int. Note that the
128 -- underlying operating system may assume that values of this type have
129 -- C.int alignment, so we need to provide a suitable alignment clause here.
131 type In_Addr_Access is access all In_Addr;
132 pragma Convention (C, In_Addr_Access);
133 -- Access to internet address
135 Inaddr_Any : aliased constant In_Addr := (others => 0);
136 -- Any internet address (all the interfaces)
138 type In_Addr_Access_Array is array (C.size_t range <>)
139 of aliased In_Addr_Access;
140 pragma Convention (C, In_Addr_Access_Array);
142 package In_Addr_Access_Pointers is
143 new C.Pointers (C.size_t, In_Addr_Access, In_Addr_Access_Array, null);
144 -- Array of internet addresses
146 type Sockaddr is record
147 Sa_Family : C.unsigned_short;
148 Sa_Data : C.char_array (1 .. 14);
150 pragma Convention (C, Sockaddr);
153 type Sockaddr_Access is access all Sockaddr;
154 pragma Convention (C, Sockaddr_Access);
155 -- Access to socket address
157 type Sockaddr_In is record
158 Sin_Family : C.unsigned_short := Constants.AF_INET;
159 Sin_Port : C.unsigned_short := 0;
160 Sin_Addr : In_Addr := Inaddr_Any;
161 Sin_Zero : C.char_array (1 .. 8) := (others => C.char'Val (0));
163 pragma Convention (C, Sockaddr_In);
164 -- Internet socket address
166 type Sockaddr_In_Access is access all Sockaddr_In;
167 pragma Convention (C, Sockaddr_In_Access);
168 -- Access to internet socket address
171 (Sin : Sockaddr_In_Access;
173 pragma Inline (Set_Length);
174 -- Set Sin.Sin_Length to Len.
175 -- On this platform, nothing is done as there is no such field.
178 (Sin : Sockaddr_In_Access;
180 pragma Inline (Set_Family);
181 -- Set Sin.Sin_Family to Family
184 (Sin : Sockaddr_In_Access;
185 Port : C.unsigned_short);
186 pragma Inline (Set_Port);
187 -- Set Sin.Sin_Port to Port
189 procedure Set_Address
190 (Sin : Sockaddr_In_Access;
192 pragma Inline (Set_Address);
193 -- Set Sin.Sin_Addr to Address
195 type Hostent is record
196 H_Name : C.Strings.chars_ptr;
197 H_Aliases : Chars_Ptr_Pointers.Pointer;
200 H_Addr_List : In_Addr_Access_Pointers.Pointer;
202 pragma Convention (C, Hostent);
205 type Hostent_Access is access all Hostent;
206 pragma Convention (C, Hostent_Access);
207 -- Access to host entry
209 type Servent is record
210 S_Name : C.Strings.chars_ptr;
211 S_Aliases : Chars_Ptr_Pointers.Pointer;
213 S_Proto : C.Strings.chars_ptr;
215 pragma Convention (C, Servent);
218 type Servent_Access is access all Servent;
219 pragma Convention (C, Servent_Access);
220 -- Access to service entry
222 type Two_Ints is array (0 .. 1) of C.int;
223 pragma Convention (C, Two_Ints);
224 -- Container for two int values
226 subtype Fd_Pair is Two_Ints;
227 -- Two_Ints as used for Create_Signalling_Fds: a pair of connected file
228 -- descriptors, one of which (the "read end" of the connection) being used
229 -- for reading, the other one (the "write end") being used for writing.
231 Read_End : constant := 0;
232 Write_End : constant := 1;
233 -- Indices into an Fd_Pair value providing access to each of the connected
236 --------------------------------
237 -- Standard library functions --
238 --------------------------------
242 Addr : System.Address;
243 Addrlen : not null access C.int) return C.int;
247 Name : System.Address;
248 Namelen : C.int) return C.int;
251 (Fd : C.int) return C.int;
255 Name : System.Address;
256 Namelen : C.int) return C.int;
258 function C_Gethostname
259 (Name : System.Address;
260 Namelen : C.int) return C.int;
262 function C_Getpeername
264 Name : System.Address;
265 Namelen : not null access C.int) return C.int;
267 function C_Getsockname
269 Name : System.Address;
270 Namelen : not null access C.int) return C.int;
272 function C_Getsockopt
276 Optval : System.Address;
277 Optlen : not null access C.int) return C.int;
280 (Cp : C.Strings.chars_ptr) return C.int;
285 Arg : Int_Access) return C.int;
289 Backlog : C.int) return C.int;
293 Iov : System.Address;
294 Iovcnt : C.int) return C.int;
298 Msg : System.Address;
300 Flags : C.int) return C.int;
304 Msg : System.Address;
307 From : Sockaddr_In_Access;
308 Fromlen : not null access C.int) return C.int;
312 Readfds : Fd_Set_Access;
313 Writefds : Fd_Set_Access;
314 Exceptfds : Fd_Set_Access;
315 Timeout : Timeval_Access) return C.int;
319 Msg : System.Address;
321 Flags : C.int) return C.int;
325 Msg : System.Address;
328 To : Sockaddr_In_Access;
329 Tolen : C.int) return C.int;
331 function C_Setsockopt
335 Optval : System.Address;
336 Optlen : C.int) return C.int;
340 How : C.int) return C.int;
345 Protocol : C.int) return C.int;
348 (Errnum : C.int) return C.Strings.chars_ptr;
351 (Command : System.Address) return C.int;
355 Iov : System.Address;
356 Iovcnt : C.int) return C.int;
358 -------------------------------------------------------
359 -- Signalling file descriptors for selector abortion --
360 -------------------------------------------------------
362 package Signalling_Fds is
364 function Create (Fds : not null access Fd_Pair) return C.int;
365 pragma Convention (C, Create);
366 -- Create a pair of connected descriptors suitable for use with C_Select
367 -- (used for signalling in Selector objects).
369 function Read (Rsig : C.int) return C.int;
370 pragma Convention (C, Read);
371 -- Read one byte of data from rsig, the read end of a pair of signalling
372 -- fds created by Create_Signalling_Fds.
374 function Write (Wsig : C.int) return C.int;
375 pragma Convention (C, Write);
376 -- Write one byte of data to wsig, the write end of a pair of signalling
377 -- fds created by Create_Signalling_Fds.
379 procedure Close (Sig : C.int);
380 pragma Convention (C, Close);
381 -- Close one end of a pair of signalling fds (ignoring any error)
385 ----------------------------
386 -- Socket sets management --
387 ----------------------------
389 procedure Free_Socket_Set
390 (Set : Fd_Set_Access);
391 -- Free system-dependent socket set
393 procedure Get_Socket_From_Set
394 (Set : Fd_Set_Access;
397 -- Get last socket in Socket and remove it from the socket set. The
398 -- parameter Last is a maximum value of the largest socket. This hint is
399 -- used to avoid scanning very large socket sets. After a call to
400 -- Get_Socket_From_Set, Last is set back to the real largest socket in the
403 procedure Insert_Socket_In_Set
404 (Set : Fd_Set_Access;
406 -- Insert socket in the socket set
408 function Is_Socket_In_Set
409 (Set : Fd_Set_Access;
410 Socket : C.int) return C.int;
411 -- Check whether Socket is in the socket set, return a non-zero
412 -- value if it is, zero if it is not.
414 procedure Last_Socket_In_Set
415 (Set : Fd_Set_Access;
417 -- Find the largest socket in the socket set. This is needed for select().
418 -- When Last_Socket_In_Set is called, parameter Last is a maximum value of
419 -- the largest socket. This hint is used to avoid scanning very large
420 -- socket sets. After the call, Last is set back to the real largest socket
421 -- in the socket set.
423 function New_Socket_Set
424 (Set : Fd_Set_Access) return Fd_Set_Access;
425 -- Allocate a new socket set which is a system-dependent structure and
426 -- initialize by copying Set if it is non-null, by making it empty
429 procedure Remove_Socket_From_Set
430 (Set : Fd_Set_Access;
432 -- Remove socket from the socket set
434 -------------------------------------------
435 -- Nonreentrant network databases access --
436 -------------------------------------------
438 function Nonreentrant_Gethostbyname
439 (Name : C.char_array) return Hostent_Access;
441 function Nonreentrant_Gethostbyaddr
442 (Addr : System.Address;
444 Addr_Type : C.int) return Hostent_Access;
446 function Nonreentrant_Getservbyname
447 (Name : C.char_array;
448 Proto : C.char_array) return Servent_Access;
450 function Nonreentrant_Getservbyport
452 Proto : C.char_array) return Servent_Access;
454 procedure Initialize;
459 pragma Import (C, C_Bind, "DECC$BIND");
460 pragma Import (C, C_Close, "DECC$CLOSE");
461 pragma Import (C, C_Gethostname, "DECC$GETHOSTNAME");
462 pragma Import (C, C_Getpeername, "DECC$GETPEERNAME");
463 pragma Import (C, C_Getsockname, "DECC$GETSOCKNAME");
464 pragma Import (C, C_Getsockopt, "DECC$GETSOCKOPT");
465 pragma Import (C, C_Inet_Addr, "DECC$INET_ADDR");
466 pragma Import (C, C_Listen, "DECC$LISTEN");
467 pragma Import (C, C_Select, "DECC$SELECT");
468 pragma Import (C, C_Setsockopt, "DECC$SETSOCKOPT");
469 pragma Import (C, C_Shutdown, "DECC$SHUTDOWN");
470 pragma Import (C, C_Strerror, "DECC$STRERROR");
471 pragma Import (C, C_System, "DECC$SYSTEM");
473 pragma Import (C, Free_Socket_Set, "__gnat_free_socket_set");
474 pragma Import (C, Get_Socket_From_Set, "__gnat_get_socket_from_set");
475 pragma Import (C, Is_Socket_In_Set, "__gnat_is_socket_in_set");
476 pragma Import (C, Last_Socket_In_Set, "__gnat_last_socket_in_set");
477 pragma Import (C, New_Socket_Set, "__gnat_new_socket_set");
478 pragma Import (C, Insert_Socket_In_Set, "__gnat_insert_socket_in_set");
479 pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set");
481 pragma Import (C, Nonreentrant_Gethostbyname, "DECC$GETHOSTBYNAME");
482 pragma Import (C, Nonreentrant_Gethostbyaddr, "DECC$GETHOSTBYADDR");
483 pragma Import (C, Nonreentrant_Getservbyname, "DECC$GETSERVBYNAME");
484 pragma Import (C, Nonreentrant_Getservbyport, "DECC$GETSERVBYPORT");
486 end GNAT.Sockets.Thin;