[dpdk-dev] [PATCH v2] usertools/dpdk-telemetry: print name of app when connected
Burakov, Anatoly
anatoly.burakov at intel.com
Tue Feb 16 13:19:24 CET 2021
On 16-Feb-21 11:39 AM, Bruce Richardson wrote:
> 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 <bruce.richardson at intel.com>
>
> ---
> V2:
> Updated with stylistic feedback from Anatoly, and split name query into a
> separate function.
> ---
> usertools/dpdk-telemetry.py | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/usertools/dpdk-telemetry.py b/usertools/dpdk-telemetry.py
> index 181859658..b2acd92ba 100755
> --- a/usertools/dpdk-telemetry.py
> +++ b/usertools/dpdk-telemetry.py
> @@ -11,6 +11,7 @@
> import os
> import glob
> import json
> +import errno
> import readline
>
> # global vars
> @@ -32,6 +33,20 @@ 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)
> @@ -45,6 +60,9 @@ 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())
> --
> 2.27.0
>
Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>
--
Thanks,
Anatoly
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