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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- G N A T . S O C K E T S . T H I N _ C O M M O N --
--- --
--- S p e c --
--- --
--- Copyright (C) 2008, AdaCore --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is the target-independent part of the thin sockets mapping.
--- This package should not be directly with'ed by an applications program.
-
-with Ada.Unchecked_Conversion;
-
-with Interfaces.C;
-with Interfaces.C.Pointers;
-with Interfaces.C.Strings;
-
-package GNAT.Sockets.Thin_Common is
-
- package C renames Interfaces.C;
-
- use type C.int;
- -- This is so we can declare the Failure constant below
-
- Success : constant C.int := 0;
- Failure : constant C.int := -1;
-
- type time_t is
- range -2 ** (8 * SOSC.SIZEOF_tv_sec - 1)
- .. 2 ** (8 * SOSC.SIZEOF_tv_sec - 1) - 1;
- for time_t'Size use 8 * SOSC.SIZEOF_tv_sec;
- pragma Convention (C, time_t);
-
- type suseconds_t is
- range -2 ** (8 * SOSC.SIZEOF_tv_usec - 1)
- .. 2 ** (8 * SOSC.SIZEOF_tv_usec - 1) - 1;
- for suseconds_t'Size use 8 * SOSC.SIZEOF_tv_usec;
- pragma Convention (C, suseconds_t);
-
- type Timeval is record
- Tv_Sec : time_t;
- Tv_Usec : suseconds_t;
- end record;
- pragma Convention (C, Timeval);
-
- type Timeval_Access is access all Timeval;
- pragma Convention (C, Timeval_Access);
-
- Immediat : constant Timeval := (0, 0);
-
- -------------------------------------------
- -- Mapping tables to low level constants --
- -------------------------------------------
-
- Families : constant array (Family_Type) of C.int :=
- (Family_Inet => SOSC.AF_INET,
- Family_Inet6 => SOSC.AF_INET6);
-
- Lengths : constant array (Family_Type) of C.unsigned_char :=
- (Family_Inet => SOSC.SIZEOF_sockaddr_in,
- Family_Inet6 => SOSC.SIZEOF_sockaddr_in6);
-
- ----------------------------
- -- Generic socket address --
- ----------------------------
-
- -- Common header
-
- -- All socket address types (struct sockaddr, struct sockaddr_storage,
- -- and protocol specific address types) start with the same 2-byte header,
- -- which is either a length and a family (one byte each) or just a two-byte
- -- family. The following unchecked union describes the two possible layouts
- -- and is meant to be constrained with SOSC.Have_Sockaddr_Len.
-
- type Sockaddr_Length_And_Family
- (Has_Sockaddr_Len : Boolean := False)
- is record
- case Has_Sockaddr_Len is
- when True =>
- Length : C.unsigned_char;
- Char_Family : C.unsigned_char;
-
- when False =>
- Short_Family : C.unsigned_short;
- end case;
- end record;
- pragma Unchecked_Union (Sockaddr_Length_And_Family);
- pragma Convention (C, Sockaddr_Length_And_Family);
-
- procedure Set_Family
- (Length_And_Family : out Sockaddr_Length_And_Family;
- Family : Family_Type);
- -- Set the family component to the appropriate value for Family, and also
- -- set Length accordingly if applicable on this platform.
-
- type Sockaddr is record
- Sa_Family : Sockaddr_Length_And_Family;
- -- Address family (and address length on some platforms)
-
- Sa_Data : C.char_array (1 .. 14) := (others => C.nul);
- -- Family-specific data
- -- Note that some platforms require that all unused (reserved) bytes
- -- in addresses be initialized to 0 (e.g. VxWorks).
- end record;
- pragma Convention (C, Sockaddr);
- -- Generic socket address
-
- type Sockaddr_Access is access all Sockaddr;
- pragma Convention (C, Sockaddr_Access);
- -- Access to socket address
-
- ----------------------------
- -- AF_INET socket address --
- ----------------------------
-
- type In_Addr is record
- S_B1, S_B2, S_B3, S_B4 : C.unsigned_char;
- end record;
- for In_Addr'Alignment use C.int'Alignment;
- pragma Convention (C, In_Addr);
- -- IPv4 address, represented as a network-order C.int. Note that the
- -- underlying operating system may assume that values of this type have
- -- C.int alignment, so we need to provide a suitable alignment clause here.
-
- function To_In_Addr is new Ada.Unchecked_Conversion (C.int, In_Addr);
- function To_Int is new Ada.Unchecked_Conversion (In_Addr, C.int);
-
- type In_Addr_Access is access all In_Addr;
- pragma Convention (C, In_Addr_Access);
- -- Access to internet address
-
- Inaddr_Any : aliased constant In_Addr := (others => 0);
- -- Any internet address (all the interfaces)
-
- type In_Addr_Access_Array is array (C.size_t range <>)
- of aliased In_Addr_Access;
- pragma Convention (C, In_Addr_Access_Array);
-
- package In_Addr_Access_Pointers is new C.Pointers
- (C.size_t, In_Addr_Access, In_Addr_Access_Array, null);
- -- Array of internet addresses
-
- type Sockaddr_In is record
- Sin_Family : Sockaddr_Length_And_Family;
- -- Address family (and address length on some platforms)
-
- Sin_Port : C.unsigned_short;
- -- Port in network byte order
-
- Sin_Addr : In_Addr;
- -- IPv4 address
-
- Sin_Zero : C.char_array (1 .. 8) := (others => C.nul);
- -- Padding
- -- Note that some platforms require that all unused (reserved) bytes
- -- in addresses be initialized to 0 (e.g. VxWorks).
- end record;
- pragma Convention (C, Sockaddr_In);
- -- Internet socket address
-
- type Sockaddr_In_Access is access all Sockaddr_In;
- pragma Convention (C, Sockaddr_In_Access);
- -- Access to internet socket address
-
- procedure Set_Port
- (Sin : Sockaddr_In_Access;
- Port : C.unsigned_short);
- pragma Inline (Set_Port);
- -- Set Sin.Sin_Port to Port
-
- procedure Set_Address
- (Sin : Sockaddr_In_Access;
- Address : In_Addr);
- pragma Inline (Set_Address);
- -- Set Sin.Sin_Addr to Address
-
- ---------------------
- -- Service entries --
- ---------------------
-
- type Chars_Ptr_Array is array (C.size_t range <>) of
- aliased C.Strings.chars_ptr;
-
- package Chars_Ptr_Pointers is
- new C.Pointers (C.size_t, C.Strings.chars_ptr, Chars_Ptr_Array,
- C.Strings.Null_Ptr);
- -- Arrays of C (char *)
-
- type Servent is record
- S_Name : C.Strings.chars_ptr;
- S_Aliases : Chars_Ptr_Pointers.Pointer;
- S_Port : C.int;
- S_Proto : C.Strings.chars_ptr;
- end record;
- pragma Convention (C, Servent);
- -- Service entry
-
- type Servent_Access is access all Servent;
- pragma Convention (C, Servent_Access);
- -- Access to service entry
-
- ------------------
- -- Host entries --
- ------------------
-
- type Hostent is record
- H_Name : C.Strings.chars_ptr;
- H_Aliases : Chars_Ptr_Pointers.Pointer;
- H_Addrtype : SOSC.H_Addrtype_T;
- H_Length : SOSC.H_Length_T;
- H_Addr_List : In_Addr_Access_Pointers.Pointer;
- end record;
- pragma Convention (C, Hostent);
- -- Host entry
-
- type Hostent_Access is access all Hostent;
- pragma Convention (C, Hostent_Access);
- -- Access to host entry
-
- ----------------------------
- -- Socket sets management --
- ----------------------------
-
- type Int_Access is access all C.int;
- pragma Convention (C, Int_Access);
- -- Access to C integers
-
- procedure Free_Socket_Set (Set : Fd_Set_Access);
- -- Free system-dependent socket set
-
- procedure Get_Socket_From_Set
- (Set : Fd_Set_Access;
- Socket : Int_Access;
- Last : Int_Access);
- -- Get last socket in Socket and remove it from the socket set. The
- -- parameter Last is a maximum value of the largest socket. This hint is
- -- used to avoid scanning very large socket sets. After a call to
- -- Get_Socket_From_Set, Last is set back to the real largest socket in the
- -- socket set.
-
- procedure Insert_Socket_In_Set
- (Set : Fd_Set_Access;
- Socket : C.int);
- -- Insert socket in the socket set
-
- function Is_Socket_In_Set
- (Set : Fd_Set_Access;
- Socket : C.int) return C.int;
- -- Check whether Socket is in the socket set, return a non-zero
- -- value if it is, zero if it is not.
-
- procedure Last_Socket_In_Set
- (Set : Fd_Set_Access;
- Last : Int_Access);
- -- Find the largest socket in the socket set. This is needed for select().
- -- When Last_Socket_In_Set is called, parameter Last is a maximum value of
- -- the largest socket. This hint is used to avoid scanning very large
- -- socket sets. After the call, Last is set back to the real largest socket
- -- in the socket set.
-
- function New_Socket_Set
- (Set : Fd_Set_Access) return Fd_Set_Access;
- -- Allocate a new socket set which is a system-dependent structure and
- -- initialize by copying Set if it is non-null, by making it empty
- -- otherwise.
-
- procedure Remove_Socket_From_Set
- (Set : Fd_Set_Access;
- Socket : C.int);
- -- Remove socket from the socket set
-
- ------------------------------------------
- -- Pairs of signalling file descriptors --
- ------------------------------------------
-
- type Two_Ints is array (0 .. 1) of C.int;
- pragma Convention (C, Two_Ints);
- -- Container for two int values
-
- subtype Fd_Pair is Two_Ints;
- -- Two_Ints as used for Create_Signalling_Fds: a pair of connected file
- -- descriptors, one of which (the "read end" of the connection) being used
- -- for reading, the other one (the "write end") being used for writing.
-
- Read_End : constant := 0;
- Write_End : constant := 1;
- -- Indices into an Fd_Pair value providing access to each of the connected
- -- file descriptors.
-
-private
-
- pragma Import (C, Free_Socket_Set, "__gnat_free_socket_set");
- pragma Import (C, Get_Socket_From_Set, "__gnat_get_socket_from_set");
- pragma Import (C, Is_Socket_In_Set, "__gnat_is_socket_in_set");
- pragma Import (C, Last_Socket_In_Set, "__gnat_last_socket_in_set");
- pragma Import (C, New_Socket_Set, "__gnat_new_socket_set");
- pragma Import (C, Insert_Socket_In_Set, "__gnat_insert_socket_in_set");
- pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set");
-end GNAT.Sockets.Thin_Common;