PR target/58115
[official-gcc.git] / gcc / ada / g-sothco.ads
blobb957f225e80d699fa4129f8da9049fa4f6eaffa3
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- G N A T . S O C K E T S . T H I N _ C O M M O N --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 2008-2012, AdaCore --
10 -- --
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 3, 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. --
17 -- --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
32 -- This is the target-independent part of the thin sockets mapping.
33 -- This package should not be directly with'ed by an applications program.
35 with Ada.Unchecked_Conversion;
37 with Interfaces.C;
38 with Interfaces.C.Pointers;
40 package GNAT.Sockets.Thin_Common is
42 package C renames Interfaces.C;
44 use type C.int;
45 -- This is so we can declare the Failure constant below
47 Success : constant C.int := 0;
48 Failure : constant C.int := -1;
50 type time_t is
51 range -2 ** (8 * SOSC.SIZEOF_tv_sec - 1)
52 .. 2 ** (8 * SOSC.SIZEOF_tv_sec - 1) - 1;
53 for time_t'Size use 8 * SOSC.SIZEOF_tv_sec;
54 pragma Convention (C, time_t);
56 type suseconds_t is
57 range -2 ** (8 * SOSC.SIZEOF_tv_usec - 1)
58 .. 2 ** (8 * SOSC.SIZEOF_tv_usec - 1) - 1;
59 for suseconds_t'Size use 8 * SOSC.SIZEOF_tv_usec;
60 pragma Convention (C, suseconds_t);
62 type Timeval is record
63 Tv_Sec : time_t;
64 Tv_Usec : suseconds_t;
65 end record;
66 pragma Convention (C, Timeval);
68 type Timeval_Access is access all Timeval;
69 pragma Convention (C, Timeval_Access);
71 Immediat : constant Timeval := (0, 0);
73 -------------------------------------------
74 -- Mapping tables to low level constants --
75 -------------------------------------------
77 Families : constant array (Family_Type) of C.int :=
78 (Family_Inet => SOSC.AF_INET,
79 Family_Inet6 => SOSC.AF_INET6);
81 Lengths : constant array (Family_Type) of C.unsigned_char :=
82 (Family_Inet => SOSC.SIZEOF_sockaddr_in,
83 Family_Inet6 => SOSC.SIZEOF_sockaddr_in6);
85 ----------------------------
86 -- Generic socket address --
87 ----------------------------
89 -- Common header
91 -- All socket address types (struct sockaddr, struct sockaddr_storage,
92 -- and protocol specific address types) start with the same 2-byte header,
93 -- which is either a length and a family (one byte each) or just a two-byte
94 -- family. The following unchecked union describes the two possible layouts
95 -- and is meant to be constrained with SOSC.Have_Sockaddr_Len.
97 type Sockaddr_Length_And_Family
98 (Has_Sockaddr_Len : Boolean := False)
99 is record
100 case Has_Sockaddr_Len is
101 when True =>
102 Length : C.unsigned_char;
103 Char_Family : C.unsigned_char;
105 when False =>
106 Short_Family : C.unsigned_short;
107 end case;
108 end record;
109 pragma Unchecked_Union (Sockaddr_Length_And_Family);
110 pragma Convention (C, Sockaddr_Length_And_Family);
112 procedure Set_Family
113 (Length_And_Family : out Sockaddr_Length_And_Family;
114 Family : Family_Type);
115 -- Set the family component to the appropriate value for Family, and also
116 -- set Length accordingly if applicable on this platform.
118 type Sockaddr is record
119 Sa_Family : Sockaddr_Length_And_Family;
120 -- Address family (and address length on some platforms)
122 Sa_Data : C.char_array (1 .. 14) := (others => C.nul);
123 -- Family-specific data
124 -- Note that some platforms require that all unused (reserved) bytes
125 -- in addresses be initialized to 0 (e.g. VxWorks).
126 end record;
127 pragma Convention (C, Sockaddr);
128 -- Generic socket address
130 type Sockaddr_Access is access all Sockaddr;
131 pragma Convention (C, Sockaddr_Access);
132 -- Access to socket address
134 ----------------------------
135 -- AF_INET socket address --
136 ----------------------------
138 type In_Addr is record
139 S_B1, S_B2, S_B3, S_B4 : C.unsigned_char;
140 end record;
141 for In_Addr'Alignment use C.int'Alignment;
142 pragma Convention (C, In_Addr);
143 -- IPv4 address, represented as a network-order C.int. Note that the
144 -- underlying operating system may assume that values of this type have
145 -- C.int alignment, so we need to provide a suitable alignment clause here.
147 function To_In_Addr is new Ada.Unchecked_Conversion (C.int, In_Addr);
148 function To_Int is new Ada.Unchecked_Conversion (In_Addr, C.int);
150 type In_Addr_Access is access all In_Addr;
151 pragma Convention (C, In_Addr_Access);
152 -- Access to internet address
154 Inaddr_Any : aliased constant In_Addr := (others => 0);
155 -- Any internet address (all the interfaces)
157 type In_Addr_Access_Array is array (C.size_t range <>)
158 of aliased In_Addr_Access;
159 pragma Convention (C, In_Addr_Access_Array);
161 package In_Addr_Access_Pointers is new C.Pointers
162 (C.size_t, In_Addr_Access, In_Addr_Access_Array, null);
163 -- Array of internet addresses
165 type Sockaddr_In is record
166 Sin_Family : Sockaddr_Length_And_Family;
167 -- Address family (and address length on some platforms)
169 Sin_Port : C.unsigned_short;
170 -- Port in network byte order
172 Sin_Addr : In_Addr;
173 -- IPv4 address
175 Sin_Zero : C.char_array (1 .. 8) := (others => C.nul);
176 -- Padding
178 -- Note that some platforms require that all unused (reserved) bytes
179 -- in addresses be initialized to 0 (e.g. VxWorks).
180 end record;
181 pragma Convention (C, Sockaddr_In);
182 -- Internet socket address
184 type Sockaddr_In_Access is access all Sockaddr_In;
185 pragma Convention (C, Sockaddr_In_Access);
186 -- Access to internet socket address
188 procedure Set_Port
189 (Sin : Sockaddr_In_Access;
190 Port : C.unsigned_short);
191 pragma Inline (Set_Port);
192 -- Set Sin.Sin_Port to Port
194 procedure Set_Address
195 (Sin : Sockaddr_In_Access;
196 Address : In_Addr);
197 pragma Inline (Set_Address);
198 -- Set Sin.Sin_Addr to Address
200 ------------------
201 -- Host entries --
202 ------------------
204 type Hostent is new
205 System.Storage_Elements.Storage_Array (1 .. SOSC.SIZEOF_struct_hostent);
206 for Hostent'Alignment use 8;
207 -- Host entry. This is an opaque type used only via the following
208 -- accessor functions, because 'struct hostent' has different layouts on
209 -- different platforms.
211 type Hostent_Access is access all Hostent;
212 pragma Convention (C, Hostent_Access);
213 -- Access to host entry
215 -- Note: the hostent and servent accessors that return char*
216 -- values are compiled with GCC, and on VMS they always return
217 -- 64-bit pointers, so we can't use C.Strings.chars_ptr, which
218 -- on VMS is 32 bits.
220 function Hostent_H_Name
221 (E : Hostent_Access) return System.Address;
223 function Hostent_H_Alias
224 (E : Hostent_Access; I : C.int) return System.Address;
226 function Hostent_H_Addrtype
227 (E : Hostent_Access) return C.int;
229 function Hostent_H_Length
230 (E : Hostent_Access) return C.int;
232 function Hostent_H_Addr
233 (E : Hostent_Access; Index : C.int) return System.Address;
235 ---------------------
236 -- Service entries --
237 ---------------------
239 type Servent is new
240 System.Storage_Elements.Storage_Array (1 .. SOSC.SIZEOF_struct_servent);
241 for Servent'Alignment use 8;
242 -- Service entry. This is an opaque type used only via the following
243 -- accessor functions, because 'struct servent' has different layouts on
244 -- different platforms.
246 type Servent_Access is access all Servent;
247 pragma Convention (C, Servent_Access);
248 -- Access to service entry
250 function Servent_S_Name
251 (E : Servent_Access) return System.Address;
253 function Servent_S_Alias
254 (E : Servent_Access; Index : C.int) return System.Address;
256 function Servent_S_Port
257 (E : Servent_Access) return C.unsigned_short;
259 function Servent_S_Proto
260 (E : Servent_Access) return System.Address;
262 ------------------
263 -- NetDB access --
264 ------------------
266 -- There are three possible situations for the following NetDB access
267 -- functions:
268 -- - inherently thread safe (case of data returned in a thread specific
269 -- buffer);
270 -- - thread safe using user-provided buffer;
271 -- - thread unsafe.
273 -- In the first and third cases, the Buf and Buflen are ignored. In the
274 -- second case, the caller must provide a buffer large enough to
275 -- accommodate the returned data. In the third case, the caller must ensure
276 -- that these functions are called within a critical section.
278 function C_Gethostbyname
279 (Name : C.char_array;
280 Ret : not null access Hostent;
281 Buf : System.Address;
282 Buflen : C.int;
283 H_Errnop : not null access C.int) return C.int;
285 function C_Gethostbyaddr
286 (Addr : System.Address;
287 Addr_Len : C.int;
288 Addr_Type : C.int;
289 Ret : not null access Hostent;
290 Buf : System.Address;
291 Buflen : C.int;
292 H_Errnop : not null access C.int) return C.int;
294 function C_Getservbyname
295 (Name : C.char_array;
296 Proto : C.char_array;
297 Ret : not null access Servent;
298 Buf : System.Address;
299 Buflen : C.int) return C.int;
301 function C_Getservbyport
302 (Port : C.int;
303 Proto : C.char_array;
304 Ret : not null access Servent;
305 Buf : System.Address;
306 Buflen : C.int) return C.int;
308 ------------------------------------
309 -- Scatter/gather vector handling --
310 ------------------------------------
312 type Msghdr is record
313 Msg_Name : System.Address;
314 Msg_Namelen : C.unsigned;
315 Msg_Iov : System.Address;
316 Msg_Iovlen : SOSC.Msg_Iovlen_T;
317 Msg_Control : System.Address;
318 Msg_Controllen : C.size_t;
319 Msg_Flags : C.int;
320 end record;
321 pragma Convention (C, Msghdr);
323 ----------------------------
324 -- Socket sets management --
325 ----------------------------
327 procedure Get_Socket_From_Set
328 (Set : access Fd_Set;
329 Last : access C.int;
330 Socket : access C.int);
331 -- Get last socket in Socket and remove it from the socket set. The
332 -- parameter Last is a maximum value of the largest socket. This hint is
333 -- used to avoid scanning very large socket sets. After a call to
334 -- Get_Socket_From_Set, Last is set back to the real largest socket in the
335 -- socket set.
337 procedure Insert_Socket_In_Set
338 (Set : access Fd_Set;
339 Socket : C.int);
340 -- Insert socket in the socket set
342 function Is_Socket_In_Set
343 (Set : access constant Fd_Set;
344 Socket : C.int) return C.int;
345 -- Check whether Socket is in the socket set, return a non-zero
346 -- value if it is, zero if it is not.
348 procedure Last_Socket_In_Set
349 (Set : access Fd_Set;
350 Last : access C.int);
351 -- Find the largest socket in the socket set. This is needed for select().
352 -- When Last_Socket_In_Set is called, parameter Last is a maximum value of
353 -- the largest socket. This hint is used to avoid scanning very large
354 -- socket sets. After the call, Last is set back to the real largest socket
355 -- in the socket set.
357 procedure Remove_Socket_From_Set (Set : access Fd_Set; Socket : C.int);
358 -- Remove socket from the socket set
360 procedure Reset_Socket_Set (Set : access Fd_Set);
361 -- Make Set empty
363 ------------------------------------------
364 -- Pairs of signalling file descriptors --
365 ------------------------------------------
367 type Two_Ints is array (0 .. 1) of C.int;
368 pragma Convention (C, Two_Ints);
369 -- Container for two int values
371 subtype Fd_Pair is Two_Ints;
372 -- Two_Ints as used for Create_Signalling_Fds: a pair of connected file
373 -- descriptors, one of which (the "read end" of the connection) being used
374 -- for reading, the other one (the "write end") being used for writing.
376 Read_End : constant := 0;
377 Write_End : constant := 1;
378 -- Indexes into an Fd_Pair value providing access to each of the connected
379 -- file descriptors.
381 function Inet_Pton
382 (Af : C.int;
383 Cp : System.Address;
384 Inp : System.Address) return C.int;
386 function C_Ioctl
387 (Fd : C.int;
388 Req : SOSC.IOCTL_Req_T;
389 Arg : access C.int) return C.int;
391 private
392 pragma Import (C, Get_Socket_From_Set, "__gnat_get_socket_from_set");
393 pragma Import (C, Is_Socket_In_Set, "__gnat_is_socket_in_set");
394 pragma Import (C, Last_Socket_In_Set, "__gnat_last_socket_in_set");
395 pragma Import (C, Insert_Socket_In_Set, "__gnat_insert_socket_in_set");
396 pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set");
397 pragma Import (C, Reset_Socket_Set, "__gnat_reset_socket_set");
398 pragma Import (C, C_Ioctl, "__gnat_socket_ioctl");
399 pragma Import (C, Inet_Pton, SOSC.Inet_Pton_Linkname);
401 pragma Import (C, C_Gethostbyname, "__gnat_gethostbyname");
402 pragma Import (C, C_Gethostbyaddr, "__gnat_gethostbyaddr");
403 pragma Import (C, C_Getservbyname, "__gnat_getservbyname");
404 pragma Import (C, C_Getservbyport, "__gnat_getservbyport");
406 pragma Import (C, Servent_S_Name, "__gnat_servent_s_name");
407 pragma Import (C, Servent_S_Alias, "__gnat_servent_s_alias");
408 pragma Import (C, Servent_S_Port, "__gnat_servent_s_port");
409 pragma Import (C, Servent_S_Proto, "__gnat_servent_s_proto");
411 pragma Import (C, Hostent_H_Name, "__gnat_hostent_h_name");
412 pragma Import (C, Hostent_H_Alias, "__gnat_hostent_h_alias");
413 pragma Import (C, Hostent_H_Addrtype, "__gnat_hostent_h_addrtype");
414 pragma Import (C, Hostent_H_Length, "__gnat_hostent_h_length");
415 pragma Import (C, Hostent_H_Addr, "__gnat_hostent_h_addr");
417 end GNAT.Sockets.Thin_Common;