gcc/ada/g-socthi-vms.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) 2002-2004 Ada Core Technologies, Inc.           --
  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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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 Alpha/VMS version.
  39
  40 with Interfaces.C.Pointers;
  41
  42 with Interfaces.C.Strings;
  43 with GNAT.Sockets.Constants;
  44 with GNAT.OS_Lib;
  45
  46 with System;
  47
  48 package GNAT.Sockets.Thin is
  49
  50    --  ??? more comments needed ???
  51
  52    package C renames Interfaces.C;
  53
  54    use type C.int;
  55    --  This is so we can declare the Failure constant below
  56
  57    Success : constant C.int :=  0;
  58    Failure : constant C.int := -1;
  59
  60    function Socket_Errno return Integer renames GNAT.OS_Lib.Errno;
  61    --  Returns last socket error number.
  62
  63    function Socket_Error_Message (Errno : Integer) return C.Strings.chars_ptr;
  64    --  Returns the error message string for the error number Errno. If
  65    --  Errno is not known it returns "Unknown system error".
  66
  67    subtype Fd_Set_Access is System.Address;
  68    No_Fd_Set : constant Fd_Set_Access := System.Null_Address;
  69
  70    type Timeval_Unit is new C.int;
  71    pragma Convention (C, Timeval_Unit);
  72
  73    type Timeval is record
  74       Tv_Sec  : Timeval_Unit;
  75       Tv_Usec : Timeval_Unit;
  76    end record;
  77    pragma Convention (C, Timeval);
  78
  79    type Timeval_Access is access all Timeval;
  80    pragma Convention (C, Timeval_Access);
  81
  82    Immediat : constant Timeval := (0, 0);
  83
  84    type Int_Access is access all C.int;
  85    pragma Convention (C, Int_Access);
  86    --  Access to C integers
  87
  88    type Chars_Ptr_Array is array (C.size_t range <>) of
  89      aliased C.Strings.chars_ptr;
  90
  91    package Chars_Ptr_Pointers is
  92       new C.Pointers (C.size_t, C.Strings.chars_ptr, Chars_Ptr_Array,
  93                       C.Strings.Null_Ptr);
  94    --  Arrays of C (char *)
  95
  96    type In_Addr is record
  97       S_B1, S_B2, S_B3, S_B4 : C.unsigned_char;
  98    end record;
  99    pragma Convention (C, In_Addr);
 100    --  Internet address
 101
 102    type In_Addr_Access is access all In_Addr;
 103    pragma Convention (C, In_Addr_Access);
 104    --  Access to internet address
 105
 106    Inaddr_Any : aliased constant In_Addr := (others => 0);
 107    --  Any internet address (all the interfaces)
 108
 109    type In_Addr_Access_Array is array (C.size_t range <>)
 110      of aliased In_Addr_Access;
 111    pragma Convention (C, In_Addr_Access_Array);
 112
 113    package In_Addr_Access_Pointers is
 114      new C.Pointers (C.size_t, In_Addr_Access, In_Addr_Access_Array, null);
 115    --  Array of internet addresses
 116
 117    type Sockaddr is record
 118       Sa_Family : C.unsigned_short;
 119       Sa_Data   : C.char_array (1 .. 14);
 120    end record;
 121    pragma Convention (C, Sockaddr);
 122    --  Socket address
 123
 124    type Sockaddr_Access is access all Sockaddr;
 125    pragma Convention (C, Sockaddr_Access);
 126    --  Access to socket address
 127
 128    type Sockaddr_In is record
 129       Sin_Family : C.unsigned_short      := Constants.AF_INET;
 130       Sin_Port   : C.unsigned_short      := 0;
 131       Sin_Addr   : In_Addr               := Inaddr_Any;
 132       Sin_Zero   : C.char_array (1 .. 8) := (others => C.char'Val (0));
 133    end record;
 134    pragma Convention (C, Sockaddr_In);
 135    --  Internet socket address
 136
 137    type Sockaddr_In_Access is access all Sockaddr_In;
 138    pragma Convention (C, Sockaddr_In_Access);
 139    --  Access to internet socket address
 140
 141    procedure Set_Length
 142      (Sin : Sockaddr_In_Access;
 143       Len : C.int);
 144    pragma Inline (Set_Length);
 145    --  Set Sin.Sin_Length to Len.
 146    --  On this platform, nothing is done as there is no such field.
 147
 148    procedure Set_Family
 149      (Sin    : Sockaddr_In_Access;
 150       Family : C.int);
 151    pragma Inline (Set_Family);
 152    --  Set Sin.Sin_Family to Family
 153
 154    procedure Set_Port
 155      (Sin     : Sockaddr_In_Access;
 156       Port    : C.unsigned_short);
 157    pragma Inline (Set_Port);
 158    --  Set Sin.Sin_Port to Port
 159
 160    procedure Set_Address
 161      (Sin     : Sockaddr_In_Access;
 162       Address : In_Addr);
 163    pragma Inline (Set_Address);
 164    --  Set Sin.Sin_Addr to Address
 165
 166    type Hostent is record
 167       H_Name      : C.Strings.chars_ptr;
 168       H_Aliases   : Chars_Ptr_Pointers.Pointer;
 169       H_Addrtype  : C.int;
 170       H_Length    : C.int;
 171       H_Addr_List : In_Addr_Access_Pointers.Pointer;
 172    end record;
 173    pragma Convention (C, Hostent);
 174    --  Host entry
 175
 176    type Hostent_Access is access all Hostent;
 177    pragma Convention (C, Hostent_Access);
 178    --  Access to host entry
 179
 180    type Servent is record
 181       S_Name    : C.Strings.chars_ptr;
 182       S_Aliases : Chars_Ptr_Pointers.Pointer;
 183       S_Port    : C.int;
 184       S_Proto   : C.Strings.chars_ptr;
 185    end record;
 186    pragma Convention (C, Servent);
 187    --  Service entry
 188
 189    type Servent_Access is access all Servent;
 190    pragma Convention (C, Servent_Access);
 191    --  Access to service entry
 192
 193    type Two_Int is array (0 .. 1) of C.int;
 194    pragma Convention (C, Two_Int);
 195    --  Used with pipe()
 196
 197    function C_Accept
 198      (S       : C.int;
 199       Addr    : System.Address;
 200       Addrlen : access C.int)
 201       return    C.int;
 202
 203    function C_Bind
 204      (S       : C.int;
 205       Name    : System.Address;
 206       Namelen : C.int)
 207       return    C.int;
 208
 209    function C_Close
 210      (Fd   : C.int)
 211       return C.int;
 212
 213    function C_Connect
 214      (S       : C.int;
 215       Name    : System.Address;
 216       Namelen : C.int)
 217       return    C.int;
 218
 219    function C_Gethostbyaddr
 220      (Addr : System.Address;
 221       Len  : C.int;
 222       Typ  : C.int)
 223       return Hostent_Access;
 224
 225    function C_Gethostbyname
 226      (Name : C.char_array)
 227       return Hostent_Access;
 228
 229    function C_Gethostname
 230      (Name    : System.Address;
 231       Namelen : C.int)
 232       return    C.int;
 233
 234    function C_Getpeername
 235      (S       : C.int;
 236       Name    : System.Address;
 237       Namelen : access C.int)
 238       return    C.int;
 239
 240    function C_Getservbyname
 241      (Name  : C.char_array;
 242       Proto : C.char_array)
 243       return Servent_Access;
 244
 245    function C_Getservbyport
 246      (Port  : C.int;
 247       Proto : C.char_array)
 248       return Servent_Access;
 249
 250    function C_Getsockname
 251      (S       : C.int;
 252       Name    : System.Address;
 253       Namelen : access C.int)
 254       return    C.int;
 255
 256    function C_Getsockopt
 257      (S       : C.int;
 258       Level   : C.int;
 259       Optname : C.int;
 260       Optval  : System.Address;
 261       Optlen  : access C.int)
 262       return    C.int;
 263
 264    function C_Inet_Addr
 265      (Cp   : C.Strings.chars_ptr)
 266       return C.int;
 267
 268    function C_Ioctl
 269      (S    : C.int;
 270       Req  : C.int;
 271       Arg  : Int_Access)
 272       return C.int;
 273
 274    function C_Listen (S, Backlog : C.int) return C.int;
 275
 276    function C_Readv
 277      (Fd     : C.int;
 278       Iov    : System.Address;
 279       Iovcnt : C.int)
 280       return   C.int;
 281
 282    function C_Recv
 283      (S     : C.int;
 284       Msg   : System.Address;
 285       Len   : C.int;
 286       Flags : C.int)
 287       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)
 296       return    C.int;
 297
 298    function C_Select
 299      (Nfds      : C.int;
 300       Readfds   : Fd_Set_Access;
 301       Writefds  : Fd_Set_Access;
 302       Exceptfds : Fd_Set_Access;
 303       Timeout   : Timeval_Access)
 304       return      C.int;
 305
 306    function C_Send
 307      (S     : C.int;
 308       Msg   : System.Address;
 309       Len   : C.int;
 310       Flags : C.int)
 311       return  C.int;
 312
 313    function C_Sendto
 314      (S     : C.int;
 315       Msg   : System.Address;
 316       Len   : C.int;
 317       Flags : C.int;
 318       To    : Sockaddr_In_Access;
 319       Tolen : C.int)
 320       return  C.int;
 321
 322    function C_Setsockopt
 323      (S       : C.int;
 324       Level   : C.int;
 325       Optname : C.int;
 326       Optval  : System.Address;
 327       Optlen  : C.int)
 328       return    C.int;
 329
 330    function C_Shutdown
 331      (S    : C.int;
 332       How  : C.int)
 333       return C.int;
 334
 335    function C_Socket
 336      (Domain   : C.int;
 337       Typ      : C.int;
 338       Protocol : C.int)
 339       return     C.int;
 340
 341    function C_Strerror
 342      (Errnum : C.int)
 343       return   C.Strings.chars_ptr;
 344
 345    function C_System
 346      (Command : System.Address)
 347       return    C.int;
 348
 349    function C_Writev
 350      (Fd     : C.int;
 351       Iov    : System.Address;
 352       Iovcnt : C.int)
 353       return   C.int;
 354
 355    procedure Free_Socket_Set
 356      (Set    : Fd_Set_Access);
 357    --  Free system-dependent socket set.
 358
 359    procedure Get_Socket_From_Set
 360      (Set    : Fd_Set_Access;
 361       Socket : Int_Access;
 362       Last   : Int_Access);
 363    --  Get last socket in Socket and remove it from the socket
 364    --  set. The parameter Last is a maximum value of the largest
 365    --  socket. This hint is used to avoid scanning very large socket
 366    --  sets. After a call to Get_Socket_From_Set, Last is set back to
 367    --  the real largest socket in the socket set.
 368
 369    procedure Insert_Socket_In_Set
 370      (Set    : Fd_Set_Access;
 371       Socket : C.int);
 372    --  Insert socket in the socket set.
 373
 374    function  Is_Socket_In_Set
 375      (Set    : Fd_Set_Access;
 376       Socket : C.int) return C.int;
 377    --  Check whether Socket is in the socket set, return a non-zero
 378    --  value if it is, zero if it is not.
 379
 380    procedure Last_Socket_In_Set
 381      (Set    : Fd_Set_Access;
 382       Last   : Int_Access);
 383    --  Find the largest socket in the socket set. This is needed for
 384    --  select(). When Last_Socket_In_Set is called, parameter Last is
 385    --  a maximum value of the largest socket. This hint is used to
 386    --  avoid scanning very large socket sets. After the call, Last is
 387    --  set back to the real largest socket in the socket set.
 388
 389    function  New_Socket_Set
 390      (Set    : Fd_Set_Access)
 391      return   Fd_Set_Access;
 392    --  Allocate a new socket set which is a system-dependent structure
 393    --  and initialize by copying Set if it is non-null, by making it
 394    --  empty otherwise.
 395
 396    procedure Remove_Socket_From_Set
 397      (Set    : Fd_Set_Access;
 398       Socket : C.int);
 399    --  Remove socket from the socket set.
 400
 401    procedure Finalize;
 402    procedure Initialize (Process_Blocking_IO : Boolean);
 403
 404 private
 405
 406    pragma Import (C, C_Bind,          "DECC$BIND");
 407    pragma Import (C, C_Close,         "DECC$CLOSE");
 408    pragma Import (C, C_Gethostbyaddr, "DECC$GETHOSTBYADDR");
 409    pragma Import (C, C_Gethostbyname, "DECC$GETHOSTBYNAME");
 410    pragma Import (C, C_Gethostname,   "DECC$GETHOSTNAME");
 411    pragma Import (C, C_Getpeername,   "DECC$GETPEERNAME");
 412    pragma Import (C, C_Getservbyname, "DECC$GETSERVBYNAME");
 413    pragma Import (C, C_Getservbyport, "DECC$GETSERVBYPORT");
 414    pragma Import (C, C_Getsockname,   "DECC$GETSOCKNAME");
 415    pragma Import (C, C_Getsockopt,    "DECC$GETSOCKOPT");
 416    pragma Import (C, C_Inet_Addr,     "DECC$INET_ADDR");
 417    pragma Import (C, C_Listen,        "DECC$LISTEN");
 418    pragma Import (C, C_Select,        "DECC$SELECT");
 419    pragma Import (C, C_Setsockopt,    "DECC$SETSOCKOPT");
 420    pragma Import (C, C_Shutdown,      "DECC$SHUTDOWN");
 421    pragma Import (C, C_Strerror,      "DECC$STRERROR");
 422    pragma Import (C, C_System,        "DECC$SYSTEM");
 423
 424    pragma Import (C, Free_Socket_Set, "__gnat_free_socket_set");
 425    pragma Import (C, Get_Socket_From_Set, "__gnat_get_socket_from_set");
 426    pragma Import (C, Is_Socket_In_Set, "__gnat_is_socket_in_set");
 427    pragma Import (C, Last_Socket_In_Set, "__gnat_last_socket_in_set");
 428    pragma Import (C, New_Socket_Set, "__gnat_new_socket_set");
 429    pragma Import (C, Insert_Socket_In_Set, "__gnat_insert_socket_in_set");
 430    pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set");
 431 end GNAT.Sockets.Thin;