Re: non blocking read()

[Pierre Barbier de Reuille]

Steve Holden a écrit :
Donn Cave wrote:
In article <[EMAIL PROTECTED]>,
 Gustavo Córdova Avila <[EMAIL PROTECTED]> wrote:

David Bolen wrote:

Jp Calderone <[EMAIL PROTECTED]> writes:

  def nonBlockingReadAll(fileObj):
      bytes = []
      while True:
          b = fileObj.read(1024)
          bytes.append(b)
          if len(b) < 1024:
              break
      return ''.join(bytes)
Wouldn't this still block if the input just happened to end at a
multiple of the read size (1024)?
-- David
No, it'll read up to 1024 bytes or as much as it can, and
then return an apropriatly sized string.

Depends.  I don't believe the original post mentioned
that the file is a pipe, socket or similar, but it's

It did actually specifically mention files.
Read more carrefully and you'll see that it mentionned "file object" and 
, on UNIX systems, that's very different than "file". It even mentions 
"stdin", and stdin (though not always a pipe) always bahaves like a pipe 
when it comes to non-blocking reading.

For an answer, you can modify stdin (or whatever file desciptor you 
have) to have non-blocking reading operations. It can be done using :

*****************
import fcntl, os
fcntl.fcntl(0, fcntl.F_SETFL, os.O_NONBLOCK)
*****************
You can replace the "0" by whatever file descriptor you want of course !
After that call stdin is non-blocking.
Pierre
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