ipc - python interprocess querying/control -

ipc - python interprocess querying/control -

i have python based service daemon doing lot of multiplexed io (select).

from script (also python) want query service daemon status/information and/or command processing (e.g. pause it, shut down, alter parameters, etc).

what best way send command messages ("from on process this!") , query processed info ("what result of that?") using python?

i read somewhere named pipes might work, don't know much named pipes, in python - , whether there improve alternatives.

both background service daemon , frontend programmed me, options open :)

i using linux.

pipes , named pipes solution communicate between different processes. pipes work shared memory buffer has interface mimics simple file on each of 2 ends. 1 process writes info on 1 end of pipe, , reads info on other end.

named pipes similar above , except pipe associated real file in computer.

more details @

http://www.softpanorama.org/scripting/pipes.shtml

in python, named pipe files created os.mkfifo call

x = os.mkfifo(filename)

in kid , parent open pipe file

out = os.open(filename, os.o_wronly) in = open(filename, 'r')

to write

os.write(out, 'xxxx')

to read

lines = in.readline( )

edit: adding links so

http://stackoverflow.com/questions/1430446/create-a-temporary-fifo-named-pipe-in-python http://stackoverflow.com/search?q=python+named+pipes

you may want read more on "ipc , python"

http://www.freenetpages.co.uk/hp/alan.gauld/tutipc.htm

python ipc