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Thu, 20 Feb 2025 09:29:55 -0800 (PST) Date: Thu, 20 Feb 2025 09:29:54 -0800 From: Stanislav Fomichev To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, jdamato@fastly.com, petrm@nvidia.com Subject: Re: [PATCH net-next v2 5/7] selftests: drv-net: add a way to wait for a local process Message-ID: References: <20250219234956.520599-1-kuba@kernel.org> <20250219234956.520599-6-kuba@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20250219234956.520599-6-kuba@kernel.org> On 02/19, Jakub Kicinski wrote: > We use wait_port_listen() extensively to wait for a process > we spawned to be ready. Not all processes will open listening > sockets. Add a method of explicitly waiting for a child to > be ready. Pass a FD to the spawned process and wait for it > to write a message to us. FD number is passed via KSFT_READY_FD > env variable. > > Similarly use KSFT_WAIT_FD to let the child process for a sign > that we are done and child should exit. Sending a signal to > a child with shell=True can get tricky. > > Make use of this method in the queues test to make it less flaky. > > Signed-off-by: Jakub Kicinski Acked-by: Stanislav Fomichev