gcc/ada/libgnat/g-sothco.ads

   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) 2008-2018, 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 ------------------------------------------------------------------------------
  31
  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.
  34
  35 with Ada.Unchecked_Conversion;
  36
  37 with Interfaces.C;
  38 with Interfaces.C.Pointers;
  39
  40 package GNAT.Sockets.Thin_Common is
  41
  42    package C renames Interfaces.C;
  43
  44    Success : constant C.int :=  0;
  45    Failure : constant C.int := -1;
  46
  47    type time_t is
  48      range -2 ** (8 * SOSC.SIZEOF_tv_sec - 1)
  49          .. 2 ** (8 * SOSC.SIZEOF_tv_sec - 1) - 1;
  50    for time_t'Size use 8 * SOSC.SIZEOF_tv_sec;
  51    pragma Convention (C, time_t);
  52
  53    type suseconds_t is
  54      range -2 ** (8 * SOSC.SIZEOF_tv_usec - 1)
  55          .. 2 ** (8 * SOSC.SIZEOF_tv_usec - 1) - 1;
  56    for suseconds_t'Size use 8 * SOSC.SIZEOF_tv_usec;
  57    pragma Convention (C, suseconds_t);
  58
  59    type Timeval is record
  60       Tv_Sec  : time_t;
  61       Tv_Usec : suseconds_t;
  62    end record;
  63    pragma Convention (C, Timeval);
  64
  65    type Timeval_Access is access all Timeval;
  66    pragma Convention (C, Timeval_Access);
  67
  68    Immediat : constant Timeval := (0, 0);
  69
  70    -------------------------------------------
  71    -- Mapping tables to low level constants --
  72    -------------------------------------------
  73
  74    Families : constant array (Family_Type) of C.int :=
  75                 (Family_Inet  => SOSC.AF_INET,
  76                  Family_Inet6 => SOSC.AF_INET6);
  77
  78    Lengths  : constant array (Family_Type) of C.unsigned_char :=
  79                 (Family_Inet  => SOSC.SIZEOF_sockaddr_in,
  80                  Family_Inet6 => SOSC.SIZEOF_sockaddr_in6);
  81
  82    ----------------------------
  83    -- Generic socket address --
  84    ----------------------------
  85
  86    --  Common header
  87
  88    --  All socket address types (struct sockaddr, struct sockaddr_storage,
  89    --  and protocol specific address types) start with the same 2-byte header,
  90    --  which is either a length and a family (one byte each) or just a two-byte
  91    --  family. The following unchecked union describes the two possible layouts
  92    --  and is meant to be constrained with SOSC.Have_Sockaddr_Len.
  93
  94    type Sockaddr_Length_And_Family
  95      (Has_Sockaddr_Len : Boolean := False)
  96    is record
  97       case Has_Sockaddr_Len is
  98          when True =>
  99             Length      : C.unsigned_char;
 100             Char_Family : C.unsigned_char;
 101
 102          when False =>
 103             Short_Family : C.unsigned_short;
 104       end case;
 105    end record;
 106    pragma Unchecked_Union (Sockaddr_Length_And_Family);
 107    pragma Convention (C, Sockaddr_Length_And_Family);
 108
 109    procedure Set_Family
 110      (Length_And_Family : out Sockaddr_Length_And_Family;
 111       Family            : Family_Type);
 112    --  Set the family component to the appropriate value for Family, and also
 113    --  set Length accordingly if applicable on this platform.
 114
 115    type Sockaddr is record
 116       Sa_Family : Sockaddr_Length_And_Family;
 117       --  Address family (and address length on some platforms)
 118
 119       Sa_Data : C.char_array (1 .. 14) := (others => C.nul);
 120       --  Family-specific data
 121       --  Note that some platforms require that all unused (reserved) bytes
 122       --  in addresses be initialized to 0 (e.g. VxWorks).
 123    end record;
 124    pragma Convention (C, Sockaddr);
 125    --  Generic socket address
 126
 127    type Sockaddr_Access is access all Sockaddr;
 128    pragma Convention (C, Sockaddr_Access);
 129    --  Access to socket address
 130
 131    ----------------------------
 132    -- AF_INET socket address --
 133    ----------------------------
 134
 135    type In_Addr is record
 136       S_B1, S_B2, S_B3, S_B4 : C.unsigned_char;
 137    end record;
 138    for In_Addr'Alignment use C.int'Alignment;
 139    pragma Convention (C, In_Addr);
 140    --  IPv4 address, represented as a network-order C.int. Note that the
 141    --  underlying operating system may assume that values of this type have
 142    --  C.int alignment, so we need to provide a suitable alignment clause here.
 143
 144    function To_In_Addr is new Ada.Unchecked_Conversion (C.int, In_Addr);
 145    function To_Int     is new Ada.Unchecked_Conversion (In_Addr, C.int);
 146
 147    type In_Addr_Access is access all In_Addr;
 148    pragma Convention (C, In_Addr_Access);
 149    --  Access to internet address
 150
 151    Inaddr_Any : aliased constant In_Addr := (others => 0);
 152    --  Any internet address (all the interfaces)
 153
 154    type In_Addr_Access_Array is array (C.size_t range <>)
 155      of aliased In_Addr_Access;
 156    pragma Convention (C, In_Addr_Access_Array);
 157
 158    package In_Addr_Access_Pointers is new C.Pointers
 159      (C.size_t, In_Addr_Access, In_Addr_Access_Array, null);
 160    --  Array of internet addresses
 161
 162    type Sockaddr_In is record
 163       Sin_Family : Sockaddr_Length_And_Family;
 164       --  Address family (and address length on some platforms)
 165
 166       Sin_Port : C.unsigned_short;
 167       --  Port in network byte order
 168
 169       Sin_Addr : In_Addr;
 170       --  IPv4 address
 171
 172       Sin_Zero : C.char_array (1 .. 8) := (others => C.nul);
 173       --  Padding
 174       --
 175       --  Note that some platforms require that all unused (reserved) bytes
 176       --  in addresses be initialized to 0 (e.g. VxWorks).
 177    end record;
 178    pragma Convention (C, Sockaddr_In);
 179    --  Internet socket address
 180
 181    type Sockaddr_In_Access is access all Sockaddr_In;
 182    pragma Convention (C, Sockaddr_In_Access);
 183    --  Access to internet socket address
 184
 185    procedure Set_Port
 186      (Sin  : Sockaddr_In_Access;
 187       Port : C.unsigned_short);
 188    pragma Inline (Set_Port);
 189    --  Set Sin.Sin_Port to Port
 190
 191    procedure Set_Address
 192      (Sin     : Sockaddr_In_Access;
 193       Address : In_Addr);
 194    pragma Inline (Set_Address);
 195    --  Set Sin.Sin_Addr to Address
 196
 197    ------------------
 198    -- Host entries --
 199    ------------------
 200
 201    type Hostent is new
 202      System.Storage_Elements.Storage_Array (1 .. SOSC.SIZEOF_struct_hostent);
 203    for Hostent'Alignment use 8;
 204    --  Host entry. This is an opaque type used only via the following
 205    --  accessor functions, because 'struct hostent' has different layouts on
 206    --  different platforms.
 207
 208    type Hostent_Access is access all Hostent;
 209    pragma Convention (C, Hostent_Access);
 210    --  Access to host entry
 211
 212    function Hostent_H_Name
 213      (E : Hostent_Access) return System.Address;
 214
 215    function Hostent_H_Alias
 216      (E : Hostent_Access; I : C.int) return System.Address;
 217
 218    function Hostent_H_Addrtype
 219      (E : Hostent_Access) return C.int;
 220
 221    function Hostent_H_Length
 222      (E : Hostent_Access) return C.int;
 223
 224    function Hostent_H_Addr
 225      (E : Hostent_Access; Index : C.int) return System.Address;
 226
 227    ---------------------
 228    -- Service entries --
 229    ---------------------
 230
 231    type Servent is new
 232      System.Storage_Elements.Storage_Array (1 .. SOSC.SIZEOF_struct_servent);
 233    for Servent'Alignment use 8;
 234    --  Service entry. This is an opaque type used only via the following
 235    --  accessor functions, because 'struct servent' has different layouts on
 236    --  different platforms.
 237
 238    type Servent_Access is access all Servent;
 239    pragma Convention (C, Servent_Access);
 240    --  Access to service entry
 241
 242    function Servent_S_Name
 243      (E : Servent_Access) return System.Address;
 244
 245    function Servent_S_Alias
 246      (E : Servent_Access; Index : C.int) return System.Address;
 247
 248    function Servent_S_Port
 249      (E : Servent_Access) return C.unsigned_short;
 250
 251    function Servent_S_Proto
 252      (E : Servent_Access) return System.Address;
 253
 254    ------------------
 255    -- NetDB access --
 256    ------------------
 257
 258    --  There are three possible situations for the following NetDB access
 259    --  functions:
 260    --    - inherently thread safe (case of data returned in a thread specific
 261    --      buffer);
 262    --    - thread safe using user-provided buffer;
 263    --    - thread unsafe.
 264    --
 265    --  In the first and third cases, the Buf and Buflen are ignored. In the
 266    --  second case, the caller must provide a buffer large enough to
 267    --  accommodate the returned data. In the third case, the caller must ensure
 268    --  that these functions are called within a critical section.
 269
 270    function C_Gethostbyname
 271      (Name     : C.char_array;
 272       Ret      : not null access Hostent;
 273       Buf      : System.Address;
 274       Buflen   : C.int;
 275       H_Errnop : not null access C.int) return C.int;
 276
 277    function C_Gethostbyaddr
 278      (Addr      : System.Address;
 279       Addr_Len  : C.int;
 280       Addr_Type : C.int;
 281       Ret       : not null access Hostent;
 282       Buf       : System.Address;
 283       Buflen    : C.int;
 284       H_Errnop  : not null access C.int) return C.int;
 285
 286    function C_Getservbyname
 287      (Name   : C.char_array;
 288       Proto  : C.char_array;
 289       Ret    : not null access Servent;
 290       Buf    : System.Address;
 291       Buflen : C.int) return C.int;
 292
 293    function C_Getservbyport
 294      (Port   : C.int;
 295       Proto  : C.char_array;
 296       Ret    : not null access Servent;
 297       Buf    : System.Address;
 298       Buflen : C.int) return C.int;
 299
 300    ------------------------------------
 301    -- Scatter/gather vector handling --
 302    ------------------------------------
 303
 304    type Msghdr is record
 305       Msg_Name       : System.Address;
 306       Msg_Namelen    : C.unsigned;
 307       Msg_Iov        : System.Address;
 308       Msg_Iovlen     : SOSC.Msg_Iovlen_T;
 309       Msg_Control    : System.Address;
 310       Msg_Controllen : C.size_t;
 311       Msg_Flags      : C.int;
 312    end record;
 313    pragma Convention (C, Msghdr);
 314
 315    ----------------------------
 316    -- Socket sets management --
 317    ----------------------------
 318
 319    procedure Get_Socket_From_Set
 320      (Set    : access Fd_Set;
 321       Last   : access C.int;
 322       Socket : access C.int);
 323    --  Get last socket in Socket and remove it from the socket set. The
 324    --  parameter Last is a maximum value of the largest socket. This hint is
 325    --  used to avoid scanning very large socket sets. After a call to
 326    --  Get_Socket_From_Set, Last is set back to the real largest socket in the
 327    --  socket set.
 328
 329    procedure Insert_Socket_In_Set
 330      (Set    : access Fd_Set;
 331       Socket : C.int);
 332    --  Insert socket in the socket set
 333
 334    function  Is_Socket_In_Set
 335      (Set    : access constant Fd_Set;
 336       Socket : C.int) return C.int;
 337    --  Check whether Socket is in the socket set, return a non-zero
 338    --  value if it is, zero if it is not.
 339
 340    procedure Last_Socket_In_Set
 341      (Set  : access Fd_Set;
 342       Last : access C.int);
 343    --  Find the largest socket in the socket set. This is needed for select().
 344    --  When Last_Socket_In_Set is called, parameter Last is a maximum value of
 345    --  the largest socket. This hint is used to avoid scanning very large
 346    --  socket sets. After the call, Last is set back to the real largest socket
 347    --  in the socket set.
 348
 349    procedure Remove_Socket_From_Set (Set : access Fd_Set; Socket : C.int);
 350    --  Remove socket from the socket set
 351
 352    procedure Reset_Socket_Set (Set : access Fd_Set);
 353    --  Make Set empty
 354
 355    ------------------------------------------
 356    -- Pairs of signalling file descriptors --
 357    ------------------------------------------
 358
 359    type Two_Ints is array (0 .. 1) of C.int;
 360    pragma Convention (C, Two_Ints);
 361    --  Container for two int values
 362
 363    subtype Fd_Pair is Two_Ints;
 364    --  Two_Ints as used for Create_Signalling_Fds: a pair of connected file
 365    --  descriptors, one of which (the "read end" of the connection) being used
 366    --  for reading, the other one (the "write end") being used for writing.
 367
 368    Read_End  : constant := 0;
 369    Write_End : constant := 1;
 370    --  Indexes into an Fd_Pair value providing access to each of the connected
 371    --  file descriptors.
 372
 373    function Inet_Pton
 374      (Af  : C.int;
 375       Cp  : System.Address;
 376       Inp : System.Address) return C.int;
 377
 378    function C_Ioctl
 379      (Fd  : C.int;
 380       Req : SOSC.IOCTL_Req_T;
 381       Arg : access C.int) return C.int;
 382
 383 private
 384    pragma Import (C, Get_Socket_From_Set, "__gnat_get_socket_from_set");
 385    pragma Import (C, Is_Socket_In_Set, "__gnat_is_socket_in_set");
 386    pragma Import (C, Last_Socket_In_Set, "__gnat_last_socket_in_set");
 387    pragma Import (C, Insert_Socket_In_Set, "__gnat_insert_socket_in_set");
 388    pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set");
 389    pragma Import (C, Reset_Socket_Set, "__gnat_reset_socket_set");
 390    pragma Import (C, C_Ioctl, "__gnat_socket_ioctl");
 391    pragma Import (C, Inet_Pton, SOSC.Inet_Pton_Linkname);
 392
 393    pragma Import (C, C_Gethostbyname, "__gnat_gethostbyname");
 394    pragma Import (C, C_Gethostbyaddr, "__gnat_gethostbyaddr");
 395    pragma Import (C, C_Getservbyname, "__gnat_getservbyname");
 396    pragma Import (C, C_Getservbyport, "__gnat_getservbyport");
 397
 398    pragma Import (C, Servent_S_Name,  "__gnat_servent_s_name");
 399    pragma Import (C, Servent_S_Alias, "__gnat_servent_s_alias");
 400    pragma Import (C, Servent_S_Port,  "__gnat_servent_s_port");
 401    pragma Import (C, Servent_S_Proto, "__gnat_servent_s_proto");
 402
 403    pragma Import (C, Hostent_H_Name,     "__gnat_hostent_h_name");
 404    pragma Import (C, Hostent_H_Alias,    "__gnat_hostent_h_alias");
 405    pragma Import (C, Hostent_H_Addrtype, "__gnat_hostent_h_addrtype");
 406    pragma Import (C, Hostent_H_Length,   "__gnat_hostent_h_length");
 407    pragma Import (C, Hostent_H_Addr,     "__gnat_hostent_h_addr");
 408
 409 end GNAT.Sockets.Thin_Common;