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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;