Re: trouble with reading from pipes

[zentara <zentara zentara net>]

On Thu, 26 Jan 2006 13:30:22 -0600
Daniel Davidson <danield igb uiuc edu> wrote:

> Thanks everyone for the help yesterday.
>
> I now have a question about how to handle the partial line reads.  Right
> now I am guessing that the best way to do this is to keep a copy of the
> last buffer read laying around, and attach that to the next read in case
> the data needed is split on last previous, first next boundary.  Then I
> can just to a =~/\n(.*?)\n.*?$/ and the last full line will be in $1.
> Is there another (better?) preferred way to do this.  Seems like sysseek
> should be useful, but I cannot get it to work.

You can't seek on a pipe. You will have to save previous output in a buffer.

> Is there also a way to monitor if any new information has been passed to
> a readable filehandle.

You can read "perldoc -q filehandle" and look for the section 
"How can I tell if a character is waiting on a filehandle?"  It tells of
a method to detect if there is any unsent pipe data. You can find the amount,
then sysread that amount...... sort of the opposite of flushing.....you are sucking :-)

> Dan
>
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