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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) 2008-2010, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- 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; 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 ------------------ -- Host entries -- ------------------ type Hostent is new System.Storage_Elements.Storage_Array (1 .. SOSC.SIZEOF_struct_hostent); for Hostent'Alignment use 8; -- Host entry. This is an opaque type used only via the following -- accessor functions, because 'struct hostent' has different layouts on -- different platforms. type Hostent_Access is access all Hostent; pragma Convention (C, Hostent_Access); -- Access to host entry -- Note: the hostent and servent accessors that return char* -- values are compiled with GCC, and on VMS they always return -- 64-bit pointers, so we can't use C.Strings.chars_ptr, which -- on VMS is 32 bits. function Hostent_H_Name (E : Hostent_Access) return System.Address; function Hostent_H_Alias (E : Hostent_Access; I : C.int) return System.Address; function Hostent_H_Addrtype (E : Hostent_Access) return C.int; function Hostent_H_Length (E : Hostent_Access) return C.int; function Hostent_H_Addr (E : Hostent_Access; Index : C.int) return System.Address; --------------------- -- Service entries -- --------------------- 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 System.Address; function Servent_S_Alias (E : Servent_Access; Index : C.int) return System.Address; function Servent_S_Port (E : Servent_Access) return C.unsigned_short; function Servent_S_Proto (E : Servent_Access) return System.Address; ------------------ -- NetDB access -- ------------------ -- There are three possible situations for the following NetDB access -- functions: -- - inherently thread safe (case of data returned in a thread specific -- buffer); -- - thread safe using user-provided buffer; -- - thread unsafe. -- -- In the first and third cases, the Buf and Buflen are ignored. In the -- second case, the caller must provide a buffer large enough to -- accommodate the returned data. In the third case, the caller must ensure -- that these functions are called within a critical section. function C_Gethostbyname (Name : C.char_array; Ret : not null access Hostent; Buf : System.Address; Buflen : C.int; H_Errnop : not null access C.int) return C.int; function C_Gethostbyaddr (Addr : System.Address; Addr_Len : C.int; Addr_Type : C.int; Ret : not null access Hostent; Buf : System.Address; Buflen : C.int; H_Errnop : not null access C.int) return C.int; function C_Getservbyname (Name : C.char_array; Proto : C.char_array; Ret : not null access Servent; Buf : System.Address; Buflen : C.int) return C.int; function C_Getservbyport (Port : C.int; Proto : C.char_array; Ret : not null access Servent; Buf : System.Address; Buflen : C.int) return C.int; ------------------------------------ -- 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; -- Indexes into an Fd_Pair value providing access to each of the connected -- file descriptors. function Inet_Pton (Af : C.int; Cp : System.Address; 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, C_Gethostbyname, "__gnat_gethostbyname"); pragma Import (C, C_Gethostbyaddr, "__gnat_gethostbyaddr"); pragma Import (C, C_Getservbyname, "__gnat_getservbyname"); pragma Import (C, C_Getservbyport, "__gnat_getservbyport"); pragma Import (C, Servent_S_Name, "__gnat_servent_s_name"); pragma Import (C, Servent_S_Alias, "__gnat_servent_s_alias"); pragma Import (C, Servent_S_Port, "__gnat_servent_s_port"); pragma Import (C, Servent_S_Proto, "__gnat_servent_s_proto"); pragma Import (C, Hostent_H_Name, "__gnat_hostent_h_name"); pragma Import (C, Hostent_H_Alias, "__gnat_hostent_h_alias"); pragma Import (C, Hostent_H_Addrtype, "__gnat_hostent_h_addrtype"); pragma Import (C, Hostent_H_Length, "__gnat_hostent_h_length"); pragma Import (C, Hostent_H_Addr, "__gnat_hostent_h_addr"); end GNAT.Sockets.Thin_Common;
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