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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) 2008-2009, 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 new System.Storage_Elements.Storage_Array (1 .. SOSC.SIZEOF_struct_servent); for Servent'Alignment use 8; -- Service entry. This is an opaque type used only via the following -- accessor functions, because 'struct servent' has different layouts on -- different platforms. type Servent_Access is access all Servent; pragma Convention (C, Servent_Access); -- Access to service entry function Servent_S_Name (E : Servent_Access) return C.Strings.chars_ptr; function Servent_S_Aliases (E : Servent_Access) return Chars_Ptr_Pointers.Pointer; function Servent_S_Port (E : Servent_Access) return C.int; function Servent_S_Proto (E : Servent_Access) return C.Strings.chars_ptr; procedure Servent_Set_S_Name (E : Servent_Access; S_Name : C.Strings.chars_ptr); procedure Servent_Set_S_Aliases (E : Servent_Access; S_Aliases : Chars_Ptr_Pointers.Pointer); procedure Servent_Set_S_Port (E : Servent_Access; S_Port : C.int); procedure Servent_Set_S_Proto (E : Servent_Access; S_Proto : C.Strings.chars_ptr); ------------------ -- 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 ------------------------------------ -- Scatter/gather vector handling -- ------------------------------------ type Msghdr is record Msg_Name : System.Address; Msg_Namelen : C.unsigned; Msg_Iov : System.Address; Msg_Iovlen : SOSC.Msg_Iovlen_T; Msg_Control : System.Address; Msg_Controllen : C.size_t; Msg_Flags : C.int; end record; pragma Convention (C, Msghdr); ---------------------------- -- Socket sets management -- ---------------------------- procedure Get_Socket_From_Set (Set : access Fd_Set; Last : access C.int; Socket : access C.int); -- 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 : access Fd_Set; Socket : C.int); -- Insert socket in the socket set function Is_Socket_In_Set (Set : access constant Fd_Set; 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 : access Fd_Set; Last : access C.int); -- 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. procedure Remove_Socket_From_Set (Set : access Fd_Set; Socket : C.int); -- Remove socket from the socket set procedure Reset_Socket_Set (Set : access Fd_Set); -- Make Set empty ------------------------------------------ -- 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. function Inet_Pton (Af : C.int; Cp : C.Strings.chars_ptr; Inp : System.Address) return C.int; function C_Ioctl (Fd : C.int; Req : C.int; Arg : access C.int) return C.int; private 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, Insert_Socket_In_Set, "__gnat_insert_socket_in_set"); pragma Import (C, Remove_Socket_From_Set, "__gnat_remove_socket_from_set"); pragma Import (C, Reset_Socket_Set, "__gnat_reset_socket_set"); pragma Import (C, C_Ioctl, "__gnat_socket_ioctl"); pragma Import (C, Inet_Pton, SOSC.Inet_Pton_Linkname); pragma Import (C, Servent_S_Name, "__gnat_servent_s_name"); pragma Import (C, Servent_S_Aliases, "__gnat_servent_s_aliases"); pragma Import (C, Servent_S_Port, "__gnat_servent_s_port"); pragma Import (C, Servent_S_Proto, "__gnat_servent_s_proto"); pragma Import (C, Servent_Set_S_Name, "__gnat_servent_set_s_name"); pragma Import (C, Servent_Set_S_Aliases, "__gnat_servent_set_s_aliases"); pragma Import (C, Servent_Set_S_Port, "__gnat_servent_set_s_port"); pragma Import (C, Servent_Set_S_Proto, "__gnat_servent_set_s_proto"); end GNAT.Sockets.Thin_Common;
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