Re: trouble with reading from pipes

[Daniel Davidson <danield igb uiuc edu>]

Thanks for the answer.  That is exactly what I was looking for.

Dan


On Thu, 2006-01-26 at 14:56 -0500, zentara wrote:
> 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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