[Overview][Constants][Types][Procedures and functions][Variables] |
Duplicate a file handle
Source position: line 0
function Dup( |
oldfile: LongInt; |
var newfile: LongInt |
):Boolean; |
var oldfile: text; |
var newfile: text |
):Boolean; |
var oldfile: ; |
var newfile: |
):Boolean; |
Makes NewFilean exact copy of OldFile, after having flushed the buffer of OldFilein case it is a Text file or untyped file. Due to the buffering mechanism of Pascal, this has not the same functionality as the dup call in C. The internal Pascal buffers are not the same after this call, but when the buffers are flushed (e.g. after output), the output is sent to the same file. Doing an lseek will, however, work as in C, i.e. doing a lseek will change the fileposition in both files.
The function returns Falsein case of an error, Trueif successful.
In case of errors, Linuxerroris used to report errors.
|
Duplicate one filehandle to another |
program Example31; { Program to demonstrate the Dup function. } uses oldlinux; var f : text; begin if not dup (output,f) then Writeln ('Dup Failed !'); writeln ('This is written to stdout.'); writeln (f,'This is written to the dup file, and flushed');flush(f); writeln end.