From d786e30e806e9c157d25e70f7822185eeb676e48 Mon Sep 17 00:00:00 2001 From: Bruce Richardson Date: Tue, 16 Feb 2021 11:39:21 +0000 Subject: [PATCH] usertools: print process name when telemetry connects When the dpdk-telemetry client connects to a DPDK instance, we can use the PID provided in the initial connection message to query from /proc the name of the process we are connected to, and display that to the user. We use the "cmdline" procfs entry for the query since that is available on both Linux and FreeBSD (assuming procfs is mounted on the BSD instance). Signed-off-by: Bruce Richardson Acked-by: Anatoly Burakov Acked-by: Kevin Laatz --- usertools/dpdk-telemetry.py | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/usertools/dpdk-telemetry.py b/usertools/dpdk-telemetry.py index e68192f93f..e04aa04702 100755 --- a/usertools/dpdk-telemetry.py +++ b/usertools/dpdk-telemetry.py @@ -11,6 +11,7 @@ import socket import os import glob import json +import errno import readline import argparse @@ -33,6 +34,20 @@ def read_socket(sock, buf_len, echo=True): return ret +def get_app_name(pid): + """ return the app name for a given PID, for printing """ + proc_cmdline = os.path.join('/proc', str(pid), 'cmdline') + try: + with open(proc_cmdline) as f: + argv0 = f.read(1024).split('\0')[0] + return os.path.basename(argv0) + except IOError as e: + # ignore file not found errors + if e.errno != errno.ENOENT: + raise + return None + + def handle_socket(path): """ Connect to socket and handle user input """ sock = socket.socket(socket.AF_UNIX, socket.SOCK_SEQPACKET) @@ -46,6 +61,9 @@ def handle_socket(path): return json_reply = read_socket(sock, 1024) output_buf_len = json_reply["max_output_len"] + app_name = get_app_name(json_reply["pid"]) + if app_name: + print('Connected to application: "%s"' % app_name) # get list of commands for readline completion sock.send("/".encode()) -- 2.20.1