FpPipe
Create a set of pipe file handlers
Declaration
Source position: bunxh.inc line 37
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 |
|---|---|
| fpMkFifo | Create FIFO (named pipe) in file system |
| #rtl.unix.POpen | Pipe file to standard input/output of program |
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.