Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #80723 > unrolled thread

Bad file descriptor

Back to article view | Back to comp.lang.python

Contents

  Bad file descriptor satishmlmlml@gmail.com - 2014-11-13 15:40 -0800
    Re: Bad file descriptor sohcahtoa82@gmail.com - 2014-11-13 15:43 -0800
    Re: Bad file descriptor Ben Finney <ben+python@benfinney.id.au> - 2014-11-14 10:56 +1100
      Re: Bad file descriptor Roy Smith <roy@panix.com> - 2014-11-13 19:41 -0500
    Re: Bad file descriptor Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-11-14 05:17 +0000
    Re: Bad file descriptor Cameron Simpson <cs@zip.com.au> - 2014-11-14 18:42 +1100

#80723 — Bad file descriptor

import os
os.write(1, b'Hello descriptor world\n')
OSError: Bad file descriptor

How to give a file descriptor number to this function? How to get a file descriptor number?

[toc] | [next] | [standalone]

#80726

On Thursday, November 13, 2014 3:40:50 PM UTC-8, satish...@gmail.com wrote:
> import os
> os.write(1, b'Hello descriptor world\n')
> OSError: Bad file descriptor
> 
> How to give a file descriptor number to this function? How to get a file descriptor number?

http://bit.ly/1zRWHyq

[toc] | [prev] | [next] | [standalone]

#80731

satishmlmlml@gmail.com writes:

> import os
> os.write(1, b'Hello descriptor world\n')
> OSError: Bad file descriptor

It works fine for me::

    >>> import os
    >>> os.write(1, b'Hello descriptor world\n')
    Hello descriptor world
    23

You don't say which Python, or which version, you're using. In the
absence of different information, most of us will assume the latest
stable release of CPython. Currently, that is CPython 3.4.

-- 
 \      “I am too firm in my consciousness of the marvelous to be ever |
  `\       fascinated by the mere supernatural …” —Joseph Conrad, _The |
_o__)                                                     Shadow-Line_ |
Ben Finney

[toc] | [prev] | [next] | [standalone]

#80734

In article <mailman.15802.1415923204.18130.python-list@python.org>,
 Ben Finney <ben+python@benfinney.id.au> wrote:

> satishmlmlml@gmail.com writes:
> 
> > import os
> > os.write(1, b'Hello descriptor world\n')
> > OSError: Bad file descriptor
> 
> It works fine for me::
> 
>     >>> import os
>     >>> os.write(1, b'Hello descriptor world\n')
>     Hello descriptor world
>     23
> 
> You don't say which Python, or which version, you're using. In the
> absence of different information, most of us will assume the latest
> stable release of CPython. Currently, that is CPython 3.4.

I don't think this has anything to do with which version of Python he's 
using.  I think all that's happening is (for some unknown reason), fd 1 
is closed before his program runs.  You can demonstrate this, for 
example, in bash:


$ cat hello.py 
import os
os.write(1, b'Hello descriptor world\n')


$ python hello.py 
Hello descriptor world


$ 1<&- python hello.py 
Traceback (most recent call last):
  File "hello.py", line 2, in <module>
    os.write(1, b'Hello descriptor world\n')
OSError: [Errno 9] Bad file descriptor


You owe the Oracle 5 minutes of his life back and a cookie for making 
him read enough of the bash manual to figure out the syntax to tell it 
to close a descriptor.

[toc] | [prev] | [next] | [standalone]

#80740

On 13/11/2014 23:40, satishmlmlml@gmail.com wrote:
> import os
> os.write(1, b'Hello descriptor world\n')
> OSError: Bad file descriptor
>
> How to give a file descriptor number to this function? How to get a file descriptor number?
>

I suggest getting your cheque book out and paying for the advice you so 
desperately need.  Or follow the advice already given about asking smart 
questions.  Or RTFM.  Or simply go away.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

[toc] | [prev] | [next] | [standalone]

#80748

On 13Nov2014 15:40, satishmlmlml@gmail.com <satishmlmlml@gmail.com> wrote:
>import os
>os.write(1, b'Hello descriptor world\n')
>OSError: Bad file descriptor
>
>How to give a file descriptor number to this function? How to get a file descriptor number?

Wow, this must be at least the 4th post of the same question.
It now occurs to me that a newer Python won't help you.

Are you running this at a command prompt?
Or are you running this in some IDE?

The reason I ask this question is that at a command prompt, the above would 
probably work.

In short, please provide more context. What OS? What version of Python? What 
environment (command prompt, IDE (which one?), a standalone script, etc)?

CHeers,
Cameron Simpson <cs@zip.com.au>

Louis Pasteur's theory of germs is ridiculous fiction.
       --Pierre Pachet, Professor of Physiology at Toulouse, 1872

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web