The GNU Modula-2 front end to GCC

gm2-libs/Selective

DEFINITION MODULE Selective ;

(*
    Description: provides Modula-2 with access to the select(2) primitive.
*)

FROM SYSTEM IMPORT ADDRESS ;

EXPORT QUALIFIED SetOfFd, Timeval,
                 InitSet, KillSet, InitTime, KillTime,
                 GetTime, SetTime,
                 FdZero, FdSet, FdClr, FdIsSet, Select,
                 MaxFdsPlusOne, WriteCharRaw, ReadCharRaw,
                 GetTimeOfDay ;

TYPE

   SetOfFd = ADDRESS ;    (* Hidden type in Selective.c *)

   Timeval = ADDRESS ;    (* Hidden type in Selective.c *)



PROCEDURE Select (nooffds: CARDINAL;
                  readfds, writefds, exceptfds: SetOfFd;
                  timeout: Timeval) : INTEGER ;


PROCEDURE InitTime (sec, usec: CARDINAL) : Timeval ;

PROCEDURE KillTime (t: Timeval) : Timeval ;

PROCEDURE GetTime (t: Timeval; VAR sec, usec: CARDINAL) ;

PROCEDURE SetTime (t: Timeval; sec, usec: CARDINAL) ;

PROCEDURE InitSet () : SetOfFd ;

PROCEDURE KillSet (s: SetOfFd) : SetOfFd ;

PROCEDURE FdZero (s: SetOfFd) ;

PROCEDURE FdSet (fd: INTEGER; s: SetOfFd) ;

PROCEDURE FdClr (fd: INTEGER; s: SetOfFd) ;

PROCEDURE FdIsSet (fd: INTEGER; s: SetOfFd) : BOOLEAN ;

PROCEDURE MaxFdsPlusOne (a, b: INTEGER) : INTEGER ;

(* you must use the raw routines with select - not the FIO buffered routines *)

PROCEDURE WriteCharRaw (fd: INTEGER; ch: CHAR) ;

PROCEDURE ReadCharRaw (fd: INTEGER) : CHAR ;

(*
   GetTimeOfDay - fills in a record, Timeval, filled in with the
                  current system time in seconds and microseconds.
                  It returns zero (see man 3p gettimeofday)
*)


PROCEDURE GetTimeOfDay (tv: Timeval) : INTEGER ;


END Selective.