How to write to a named pipe?
JamesL at Lugoj.Com
Mon Aug 16 23:33:01 EDT 1999
singlets at my-deja.com wrote:
> >>> import os
> >>> os.mkfifo('/tmp/myfifo')
> >>> f=open('/tmp/myfifo','w') # now we're stuck
f = open('/tmp/myfifo', 'w+')
(Note the extra '+')
Not sure why 'rw' doesn't work. But 'r+' also works. Here is something you
can try: in one window start a Python interpreter and do:
f = open('/tmp/myfifo', 'w') # The usual block.
And then in the other interpreter do:
f = open('/tmp/myfifo', 'r') # Both should now return!
You can reverse the open order and get the same result. Basically pipes are
unidirectional and expect a reader and a writer. I'm so used to opening
pipes in 'C' in read/write mode that I've forgotten why things are like
this. At least it doesn't block, once you remember to always open read/write
More information about the Python-list