IOError: [Errno 28] No space left on device

Lie Ryan lie.1296 at
Wed Nov 18 03:23:41 CET 2009

hong zhang wrote:
> --- On Tue, 11/17/09, Tim Chase <python.list at> wrote:
>> From: Tim Chase <python.list at>
>> Subject: Re: IOError: [Errno 28] No space left on device
>> To: "Lie Ryan" <lie.1296 at>
>> Cc: python-list at
>> Date: Tuesday, November 17, 2009, 7:47 PM
>>>> for i in
>> glob.glob('/sys/kernel/debug/ieee80211/phy*/iwlagn/data/continuous_tx'):
>>>>     with open(i, 'w') as f:
>>>>         print
>>>> f, cont_tx
>>>> work perfectly.
>>>> But following get error like:
>>>> print >>f, cont_tx
>>>> IOError: [Errno 28] No space left on device
>>> Apparently the harddisk where you stored the file is
>> full?
>> Likely a misinterpretation of the error.  I'm guessing
>> either one needs to be root to write to this [likely
>> virtual] file, or a member of an associated group..  It
>> would help to have the output of
>> bash$ whoami
>> bash$ id
>> and
>> bash$ ls -lsF
>> /sys/kernel/debug/ieee80211/phy*/iwlagn/data/continuous_tx
> It is root. see following. 
>   File "../henry-cont-tx", line 186, in do_cont_tx
>     print >>f, cont_tx
> IOError: [Errno 28] No space left on device
> root at tester-laptop:/home/tester/Desktop/sv-project/scripts/scripts# whoami
> root
> root at tester-laptop:/home/tester/Desktop/sv-project/scripts/scripts# id
> uid=0(root) gid=0(root) groups=0(root)
> root at tester-laptop:/home/tester/Desktop/sv-project/scripts/scripts# ls -lsF /sys/kernel/debug/ieee80211/phy*/iwlagn/data/continuous_tx
> 0 -rw------- 1 root root 0 2009-11-17 17:51 /sys/kernel/debug/ieee80211/phy2/iwlagn/data/continuous_tx

Where is the output file? Could it possibly be located in a device that 
is impossible to write even for root (e.g. filesystem mounted as 
read-only or CD or floppy with the readonly switch active or NTFS 
partition without ntfs-3g driver)?

Can you write to this file from outside python (try echo-ing to the 
file)? What's the permission of the folder?

The output of your 'df' shows that you only have one partition (for 
root) and nothing else; it is quite uncommon for linux/unix to be setup 
with only one partition, you didn't trim anything right?

What's the output of:
$ mount

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