[Gambas-user] Pipe doesn't receive contents

[Rolf Schmidt]

Hi Doriano

> > You can't wait until EOF on a named pipe! Also a 'tail' on a named pipe
> > will never give you some data - but 'cat' do!
> >
> > Just read and find another mechanism to stop reading.
>
> I tried cat and tail on named fifo, and both work. You can start first
> either of the two sides, and they work.
> I did it with:
>
> mkfifo /tmp/fifo
> ls >/tmp/fifo

ls sends a termiated data stream!
>
> then, in another terminal:
>
> tail -3 /tmp/fifo

Of course you can read it, because ls stops when the content is in the pipe.

> I also tried to start first the tail command, and then the cat >...
>

See a server which sends data via named pipe, then you will recognice, 
that 'cat' can show the data while 'tail' waits for an end of file, which 
will only come when the server stops! 

Hope it becomes more clear.
Rolf
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