[PATCH v5] testpmd: cleanup cleanly from signal

[Andrew Rybchenko]

On 11/9/22 20:29, Stephen Hemminger wrote:
> Do a clean shutdown of testpmd when a signal is received;
> instead of having testpmd kill itself.
> This fixes problem where a signal could be received
> in the middle of a PMD and then the signal handler would call
> PMD's close routine which could cause a deadlock.
> 
> Added benefit is it gets rid of Windows specific code.
> 
> Fixes: d9a191a00e81 ("app/testpmd: fix quitting in container")

Cc to stable?

> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>

with one nit below:

Reviewed-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>

[snip]

> @@ -4476,15 +4459,37 @@ main(int argc, char** argv)
>   				prev_time = cur_time;
>   				rte_delay_us_sleep(US_PER_S);
>   			}
> -		}
> +		} else {
> +			char c;
> +			fd_set fds;
>   
> -		printf("Press enter to exit\n");
> -		rc = read(0, &c, 1);
> -		pmd_test_exit();
> -		if (rc < 0)
> -			return 1;
> +			printf("Press enter to exit\n");
> +
> +			FD_ZERO(&fds);
> +			FD_SET(0, &fds);
> +
> +			if (select(1, &fds, NULL, NULL, NULL) <= 0) {
> +				fprintf(stderr, "Select failed: %s\n",
> +					strerror(errno));
> +			} else if (read(0, &c, 1) <= 0) {
> +				fprintf(stderr,
> +					"Read stdin failed: %s\n",
> +					strerror(errno));
> +			}
> +		}
> +		stop_packet_forwarding();

force_quit() calls stop_packet_forwarding() if test_done is 0.
So, there is no difference in test_done == 0 case.
If test_done is not zero, stop_packet_forwarding() just logs
"Packet forwarding not started" and does nothing. So, the
difference is only in error message. Is it intentional?

> +		force_quit();
>   	}
>   
> +#ifdef RTE_LIB_PDUMP
> +	/* uninitialize packet capture framework */
> +	rte_pdump_uninit();
> +#endif
> +#ifdef RTE_LIB_LATENCYSTATS
> +	if (latencystats_enabled != 0)
> +		rte_latencystats_uninit();
> +#endif
> +
>   	ret = rte_eal_cleanup();
>   	if (ret != 0)
>   		rte_exit(EXIT_FAILURE,