Hi! newb here. I am trying to make a c++ program that will read from a named pipe created by python. My problem is, the named pipe created by python uses os.getpid() as part of the pipe name. when i try calling the pipe from c++, i use getpid(). i am not getting the same value from c++. is there a method equivalent in c++ for os.getpid?
thanks!
edit:
sorry, i am actually using os.getpid() to get the session id via ProcessIDtoSessionID(). i then use the session id as part of the pipe name
The standard library does not give you anything other than files. You will need to use some other OS specific API.
You don't get same proccess IDs because your python program and c++ programs are run in different proccesses thus having different process IDs. So generally use a different logic to name your fifo files.
You won't get the same value if you're running as a separate process as each process has their own process ID. Find some other way to identify the pipe.
You cannot easily retrieve the Python interpreter's PID from your C++ program.
Either assign the named pipe a constant name, or if you really need multiple pipes of the same Python program, create a temporary file to which the Python programs write their PIDs (use file locking!) - then you can read the PIDs from the C++ program.