gcc/ada/g-socthi.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                    G N A T . S O C K E T S . T H I N                     --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2001-2005, 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 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.                                              --
  21 --                                                                          --
  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.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  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.
  37
  38 --  This is the default version
  39
  40 with Interfaces.C.Pointers;
  41 with Interfaces.C.Strings;
  42 with GNAT.Sockets.Constants;
  43 with GNAT.OS_Lib;
  44
  45 with System;
  46
  47 package GNAT.Sockets.Thin is
  48
  49    --  This package is intended for hosts implementing BSD sockets with a
  50    --  standard interface. It will be used as a default for all the platforms
  51    --  that do not have a specific version of this file.
  52
  53    package C renames Interfaces.C;
  54
  55    use type C.int;
  56    --  This is so we can declare the Failure constant below
  57
  58    Success : constant C.int :=  0;
  59    Failure : constant C.int := -1;
  60
  61    function Socket_Errno return Integer renames GNAT.OS_Lib.Errno;
  62    --  Returns last socket error number
  63
  64    function Socket_Error_Message (Errno : Integer) return C.Strings.chars_ptr;
  65    --  Returns the error message string for the error number Errno. If Errno is
  66    --  not known it returns "Unknown system error".
  67
  68    function Host_Errno return Integer;
  69    pragma Import (C, Host_Errno, "__gnat_get_h_errno");
  70    --  Returns last host error number
  71
  72    subtype Fd_Set_Access is System.Address;
  73    No_Fd_Set : constant Fd_Set_Access := System.Null_Address;
  74
  75    type time_t is
  76      range -2 ** (8 * Constants.SIZEOF_tv_sec - 1)
  77          .. 2 ** (8 * Constants.SIZEOF_tv_sec - 1) - 1;
  78    for time_t'Size use 8 * Constants.SIZEOF_tv_sec;
  79    pragma Convention (C, time_t);
  80
  81    type suseconds_t is
  82      range -2 ** (8 * Constants.SIZEOF_tv_usec - 1)
  83          .. 2 ** (8 * Constants.SIZEOF_tv_usec - 1) - 1;
  84    for suseconds_t'Size use 8 * Constants.SIZEOF_tv_usec;
  85    pragma Convention (C, suseconds_t);
  86
  87    type Timeval is record
  88       Tv_Sec  : time_t;
  89       Tv_Usec : suseconds_t;
  90    end record;
  91    pragma Convention (C, Timeval);
  92
  93    type Timeval_Access is access all Timeval;
  94    pragma Convention (C, Timeval_Access);
  95
  96    Immediat : constant Timeval := (0, 0);
  97
  98    type Int_Access is access all C.int;
  99    pragma Convention (C, Int_Access);
 100    --  Access to C integers
 101
 102    type Chars_Ptr_Array is array (C.size_t range <>) of
 103      aliased C.Strings.chars_ptr;
 104
 105    package Chars_Ptr_Pointers is
 106       new C.Pointers (C.size_t, C.Strings.chars_ptr, Chars_Ptr_Array,
 107                       C.Strings.Null_Ptr);
 108    --  Arrays of C (char *)
 109
 110    type In_Addr is record
 111       S_B1, S_B2, S_B3, S_B4 : C.unsigned_char;
 112    end record;
 113    pragma Convention (C, In_Addr);
 114    --  Internet address
 115
 116    type In_Addr_Access is access all In_Addr;
 117    pragma Convention (C, In_Addr_Access);
 118    --  Access to internet address
 119
 120    Inaddr_Any : aliased constant In_Addr := (others => 0);
 121    --  Any internet address (all the interfaces)
 122
 123    type In_Addr_Access_Array is array (C.size_t range <>)
 124      of aliased In_Addr_Access;
 125    pragma Convention (C, In_Addr_Access_Array);
 126
 127    package In_Addr_Access_Pointers is
 128      new C.Pointers (C.size_t, In_Addr_Access, In_Addr_Access_Array, null);
 129    --  Array of internet addresses
 130
 131    type Sockaddr is record
 132       Sa_Family : C.unsigned_short;
 133       Sa_Data   : C.char_array (1 .. 14);
 134    end record;
 135    pragma Convention (C, Sockaddr);
 136    --  Socket address
 137
 138    type Sockaddr_Access is access all Sockaddr;
 139    pragma Convention (C, Sockaddr_Access);
 140    --  Access to socket address
 141
 142    type Sockaddr_In is record
 143       Sin_Family : C.unsigned_short      := Constants.AF_INET;
 144       Sin_Port   : C.unsigned_short      := 0;
 145       Sin_Addr   : In_Addr               := Inaddr_Any;
 146       Sin_Zero   : C.char_array (1 .. 8) := (others => C.char'Val (0));
 147    end record;
 148    pragma Convention (C, Sockaddr_In);
 149    --  Internet socket address
 150
 151    type Sockaddr_In_Access is access all Sockaddr_In;
 152    pragma Convention (C, Sockaddr_In_Access);
 153    --  Access to internet socket address
 154
 155    procedure Set_Length
 156      (Sin : Sockaddr_In_Access;
 157       Len : C.int);
 158    pragma Inline (Set_Length);
 159    --  Set Sin.Sin_Length to Len.
 160    --  On this platform, nothing is done as there is no such field.
 161
 162    procedure Set_Family
 163      (Sin    : Sockaddr_In_Access;
 164       Family : C.int);
 165    pragma Inline (Set_Family);
 166    --  Set Sin.Sin_Family to Family
 167
 168    procedure Set_Port
 169      (Sin  : Sockaddr_In_Access;
 170       Port : C.unsigned_short);
 171    pragma Inline (Set_Port);
 172    --  Set Sin.Sin_Port to Port
 173
 174    procedure Set_Address
 175      (Sin     : Sockaddr_In_Access;
 176       Address : In_Addr);
 177    pragma Inline (Set_Address);
 178    --  Set Sin.Sin_Addr to Address
 179
 180    type Hostent is record
 181       H_Name      : C.Strings.chars_ptr;
 182       H_Aliases   : Chars_Ptr_Pointers.Pointer;
 183       H_Addrtype  : C.int;
 184       H_Length    : C.int;
 185       H_Addr_List : In_Addr_Access_Pointers.Pointer;
 186    end record;
 187    pragma Convention (C, Hostent);
 188    --  Host entry
 189
 190    type Hostent_Access is access all Hostent;
 191    pragma Convention (C, Hostent_Access);
 192    --  Access to host entry
 193
 194    type Servent is record
 195       S_Name    : C.Strings.chars_ptr;
 196       S_Aliases : Chars_Ptr_Pointers.Pointer;
 197       S_Port    : C.int;
 198       S_Proto   : C.Strings.chars_ptr;
 199    end record;
 200    pragma Convention (C, Servent);
 201    --  Service entry
 202
 203    type Servent_Access is access all Servent;
 204    pragma Convention (C, Servent_Access);
 205    --  Access to service entry
 206
 207    type Two_Int is array (0 .. 1) of C.int;
 208    pragma Convention (C, Two_Int);
 209    --  Used with pipe()
 210
 211    function C_Accept
 212      (S       : C.int;
 213       Addr    : System.Address;
 214       Addrlen : access C.int) return C.int;
 215
 216    function C_Bind
 217      (S       : C.int;
 218       Name    : System.Address;
 219       Namelen : C.int) return C.int;
 220
 221    function C_Close
 222      (Fd : C.int) return C.int;
 223
 224    function C_Connect
 225      (S       : C.int;
 226       Name    : System.Address;
 227       Namelen : C.int) return C.int;
 228
 229    function C_Gethostbyaddr
 230      (Addr : System.Address;
 231       Len  : C.int;
 232       Typ  : C.int) return Hostent_Access;
 233
 234    function C_Gethostbyname
 235      (Name : C.char_array) return Hostent_Access;
 236
 237    function C_Gethostname
 238      (Name    : System.Address;
 239       Namelen : C.int) return C.int;
 240
 241    function C_Getpeername
 242      (S       : C.int;
 243       Name    : System.Address;
 244       Namelen : access C.int) return C.int;
 245
 246    function C_Getservbyname
 247      (Name  : C.char_array;
 248       Proto : C.char_array) return Servent_Access;
 249
 250    function C_Getservbyport
 251      (Port  : C.int;
 252       Proto : C.char_array) return Servent_Access;
 253
 254    function C_Getsockname
 255      (S       : C.int;
 256       Name    : System.Address;
 257       Namelen : access C.int) return C.int;
 258
 259    function C_Getsockopt
 260      (S       : C.int;
 261       Level   : C.int;
 262       Optname : C.int;
 263       Optval  : System.Address;
 264       Optlen  : access C.int) return C.int;
 265
 266    function C_Inet_Addr
 267      (Cp : C.Strings.chars_ptr) return C.int;
 268
 269    function C_Ioctl
 270      (S    : C.int;
 271       Req  : C.int;
 272       Arg  : Int_Access) return C.int;
 273
 274    function C_Listen
 275      (S       : C.int;
 276       Backlog : C.int) return C.int;
 277
 278    function C_Readv
 279      (Fd     : C.int;
 280       Iov    : System.Address;
 281       Iovcnt : C.int) return C.int;
 282
 283    function C_Recv
 284      (S     : C.int;
 285       Msg   : System.Address;
 286       Len   : C.int;
 287       Flags : C.int) return C.int;
 288
 289    function C_Recvfrom
 290      (S       : C.int;
 291       Msg     : System.Address;
 292       Len     : C.int;
 293       Flags   : C.int;
 294       From    : Sockaddr_In_Access;
 295       Fromlen : access C.int) return C.int;
 296
 297    function C_Select
 298      (Nfds      : C.int;
 299       Readfds   : Fd_Set_Access;
 300       Writefds  : Fd_Set_Access;
 301       Exceptfds : Fd_Set_Access;
 302       Timeout   : Timeval_Access) return C.int;
 303
 304    function C_Send
 305      (S     : C.int;
 306       Msg   : System.Address;
 307       Len   : C.int;
 308       Flags : C.int) return C.int;
 309
 310    function C_Sendto
 311      (S     : C.int;
 312       Msg   : System.Address;
 313       Len   : C.int;
 314       Flags : C.int;
 315       To    : Sockaddr_In_Access;
 316       Tolen : C.int) return C.int;
 317
 318    function C_Setsockopt
 319      (S       : C.int;
 320       Level   : C.int;
 321       Optname : C.int;
 322       Optval  : System.Address;
 323       Optlen  : C.int) return C.int;
 324
 325    function C_Shutdown
 326      (S   : C.int;
 327       How : C.int) return C.int;
 328
 329    function C_Socket
 330      (Domain   : C.int;
 331       Typ      : C.int;
 332       Protocol : C.int) return C.int;
 333
 334    function C_Strerror
 335      (Errnum : C.int) return C.Strings.chars_ptr;
 336
 337    function C_System
 338      (Command : System.Address) return C.int;
 339
 340    function C_Writev
 341      (Fd     : C.int;
 342       Iov    : System.Address;
 343       Iovcnt : C.int) return C.int;
 344
 345    procedure Free_Socket_Set
 346      (Set : Fd_Set_Access);
 347    --  Free system-dependent socket set
 348
 349    procedure Get_Socket_From_Set
 350      (Set    : Fd_Set_Access;
 351       Socket : Int_Access;
 352       Last   : Int_Access);
 353    --  Get last socket in Socket and remove it from the socket
 354    --  set. The parameter Last is a maximum value of the largest
 355    --  socket. This hint is used to avoid scanning very large socket
 356    --  sets. After a call to Get_Socket_From_Set, Last is set back to
 357    --  the real largest socket in the socket set.
 358
 359    procedure Insert_Socket_In_Set
 360      (Set    : Fd_Set_Access;
 361       Socket : C.int);
 362    --  Insert socket in the socket set
 363
 364    function  Is_Socket_In_Set
 365      (Set    : Fd_Set_Access;
 366       Socket : C.int) return C.int;
 367    --  Check whether Socket is in the socket set, return a non-zero
 368    --  value if it is, zero if it is not.
 369
 370    procedure Last_Socket_In_Set
 371      (Set    : Fd_Set_Access;
 372       Last   : Int_Access);
 373    --  Find the largest socket in the socket set. This is needed for select().
 374    --  When Last_Socket_In_Set is called, parameter Last is a maximum value of
 375    --  the largest socket. This hint is used to avoid scanning very large
 376    --  socket sets. After the call, Last is set back to the real largest socket
 377    --  in the socket set.
 378
 379    function  New_Socket_Set
 380      (Set : Fd_Set_Access) return Fd_Set_Access;
 381    --  Allocate a new socket set which is a system-dependent structure and
 382    --  initialize by copying Set if it is non-null, by making it empty
 383    --  otherwise.
 384
 385    procedure Remove_Socket_From_Set
 386      (Set    : Fd_Set_Access;
 387       Socket : C.int);
 388    --  Remove socket from the socket set
 389
 390    procedure Finalize;
 391    procedure Initialize (Process_Blocking_IO : Boolean);
 392
 393 private
 394    pragma Import (C, C_Bind, "bind");
 395    pragma Import (C, C_Close, "close");
 396    pragma Import (C, C_Gethostbyaddr, "gethostbyaddr");
 397    pragma Import (C, C_Gethostbyname, "gethostbyname");
 398    pragma Import (C, C_Gethostname, "gethostname");
 399    pragma Import (C, C_Getpeername, "getpeername");
 400    pragma Import (C, C_Getservbyname, "getservbyname");
 401    pragma Import (C, C_Getservbyport, "getservbyport");
 402    pragma Import (C, C_Getsockname, "getsockname");
 403    pragma Import (C, C_Getsockopt, "getsockopt");
 404    pragma Import (C, C_Inet_Addr, "inet_addr");
 405    pragma Import (C, C_Listen, "listen");
 406    pragma Import (C, C_Readv, "readv");
 407    pragma Import (C, C_Select, "select");
 408    pragma Import (C, C_Setsockopt, "setsockopt");
 409    pragma Import (C, C_Shutdown, "shutdown");
 410    pragma Import (C, C_Strerror, "strerror");
 411    pragma Import (C, C_System, "system");
 412    pragma Import (C, C_Writev, "writev");
 413
 414    pragma Import (C, Free_Socket_Set, "__gnat_free_socket_set");
 415    pragma Import (C, Get_Socket_From_Set, "__gnat_get_socket_from_set");
 416    pragma Import (C, Is_Socket_In_Set, "__gnat_is_socket_in_set");
 417    pragma Import (C, Last_Socket_In_Set, "__gnat_last_socket_in_set");
 418    pragma Import (C, New_Socket_Set, "__gnat_new_socket_set");
 419    pragma Import (C, Insert_Socket_In_Set, "__gnat_insert_socket_in_set");
 420    pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set");
 421 end GNAT.Sockets.Thin;