Question

I’m starting the script with ./file.py < pipe >> logfile
and the script is:

while True:
    try:
            I = raw_input().strip().split()
    except EOFError:
            continue
    doSomething()

How could I better handle named pipe? This script always run at 100% CPU and it need to be real-time so I cannot use time.sleep.

Answer 1

At EOF you will loop forever getting yet another EOF. No more input will be done after EOF.

EOF does not mean a “gap” in the data. It means the named socket was disconnected and can no longer be used.

If you want “real-time” data, you have to read individual bytes from the socket until you get a complete “message”. Perhaps a message ends with a '\n'. You can’t use raw_input.

You have to use sys.stdin.read(1) to get bytes.

Pipes, BTW, are buffered. So you won’t get real-time anything. If you want “real-time” you have to use UDP sockets, not TCP pipes.