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    FpPipe

    Create a set of pipe file handlers.

    Declaration

    Source position: bunxh.inc line 41

    function FpPipe(var fildes: TFilDes) : cint;

    Description

    FpPipe creates a pipe, i.e. two file objects, one for input, one for output. The file handles are returned in the array fildes. The input handle is in the 0-th element of the array, the output handle is in the 1-st element.

    The function returns zero if everything went successfully, a nonzero return value indicates an error.

    Errors

    In case the function fails, the following return values are possible:

    sys_emfile
    Too many file descriptors for this process.
    sys_enfile
    The system file table is full.

    See also

    Name Description
    #rtl.unix.POpen Pipe file to standard input/output of program.
    fpMkFifo Create FIFO (named pipe) in file system.

    Example

    Program Example36;

{ Program to demonstrate the AssignPipe function. }

Uses BaseUnix,Unix;

Var pipi,pipo : Text;
    s : String;

begin
  Writeln ('Assigning Pipes.');
  If assignpipe(pipi,pipo)<>0 then
    Writeln('Error assigning pipes !',fpgeterrno);
  Writeln ('Writing to pipe, and flushing.');
  Writeln (pipo,'This is a textstring');close(pipo);
  Writeln ('Reading from pipe.');
  While not eof(pipi) do
    begin
    Readln (pipi,s);
    Writeln ('Read from pipe : ',s);
    end;
  close (pipi);
  writeln ('Closed pipes.');
  writeln
end.