directory wildcard

[Tim Chase]

> I try to assign value to force_mcs sitting in a wildcard
> subdirectory /sys/kernel/debug/ieee80211/phy*, but python does
> not work for that such as:
> 
> os.system("echo %i >
> /sys/kernel/debug/ieee80211/phy*/iwlagn/data/force_mcs" % mcs)
> 
> Any right way to do it?

I'm not sure your code works if there's more than one phy* 
directory in that folder anyways since ">" piping usually only 
works for a single destination.  Though I'd imagine this is only 
a problem for folks that have more than one 802.11 card in their 
machine (which I've done...a useless on-board and a PCMCIA on an 
older laptop).

I'd use python's built-in glob module to do something like

   from glob import glob
   def set_force_mcs(mcs):
     for fname in glob('/sys/kernel/debug/'
         'ieee80211/phy*/iwlagn/data/force_mcs'):
       f = open(fname, 'w')
       f.write('%i\n' % mcs)
       f.close()
   #the following should all work
   set_force_mcs(True)
   set_force_mcs(False)
   set_force_mcs(1)
   set_force_mcs(0)

(I broke the for/glob line intentionally in a way that python 
transparently restores in case mailers munged them between here 
in there...normally, I'd just use a single string parameter for 
glob() instead of line-breaking it if it fit in 80 chars)

If you're using a more recent version of python that has the 
"with" command (I think it was added in 2.6, and available from 
2.5's future), it could be tidied to

   with open(fname, 'w') as f:
     f.write('%i\n' % mcs)


-tkc