[PATCH v6] testpmd: cleanup cleanly from signal

[Stephen Hemminger <stephen@networkplumber.org>]

Do a clean shutdown of testpmd when a signal is received;
instead of having testpmd kill itself.
This fixes the problem where a signal could be received
in the middle of a PMD and then the signal handler would call
PMD's close routine leading to locking problems.

An added benefit is it gets rid of some Windows specific code.

Fixes: d9a191a00e81 ("app/testpmd: fix quitting in container")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
v5 - drop unnecessary print in signal handler.
     don't cleanup twice
     don't print message when select() is interrupted.

 app/test-pmd/testpmd.c | 72 ++++++++++++++++++++----------------------
 1 file changed, 35 insertions(+), 37 deletions(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index cf5942d0c422..62d87f758ac8 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -11,6 +11,7 @@
 #include <fcntl.h>
 #ifndef RTE_EXEC_ENV_WINDOWS
 #include <sys/mman.h>
+#include <sys/select.h>
 #endif
 #include <sys/types.h>
 #include <errno.h>
@@ -4224,13 +4225,6 @@ init_port(void)
 	memset(txring_numa, NUMA_NO_CONFIG, RTE_MAX_ETHPORTS);
 }
 
-static void
-force_quit(void)
-{
-	pmd_test_exit();
-	prompt_exit();
-}
-
 static void
 print_stats(void)
 {
@@ -4249,28 +4243,9 @@ print_stats(void)
 }
 
 static void
-signal_handler(int signum)
+signal_handler(int signum __rte_unused)
 {
-	if (signum == SIGINT || signum == SIGTERM) {
-		fprintf(stderr, "\nSignal %d received, preparing to exit...\n",
-			signum);
-#ifdef RTE_LIB_PDUMP
-		/* uninitialize packet capture framework */
-		rte_pdump_uninit();
-#endif
-#ifdef RTE_LIB_LATENCYSTATS
-		if (latencystats_enabled != 0)
-			rte_latencystats_uninit();
-#endif
-		force_quit();
-		/* Set flag to indicate the force termination. */
-		f_quit = 1;
-		/* exit with the expected status */
-#ifndef RTE_EXEC_ENV_WINDOWS
-		signal(signum, SIG_DFL);
-		kill(getpid(), signum);
-#endif
-	}
+	f_quit = 1;
 }
 
 int
@@ -4449,9 +4424,6 @@ main(int argc, char** argv)
 	} else
 #endif
 	{
-		char c;
-		int rc;
-
 		f_quit = 0;
 
 		printf("No commandline core given, start packet forwarding\n");
@@ -4476,15 +4448,41 @@ main(int argc, char** argv)
 				prev_time = cur_time;
 				rte_delay_us_sleep(US_PER_S);
 			}
-		}
+		} else {
+			char c;
+			fd_set fds;
+			int rc;
 
-		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);
+
+			rc = select(1, &fds, NULL, NULL, NULL);
+			if (rc < 0 && errno != EINTR) {
+				fprintf(stderr, "Select failed: %s\n",
+					strerror(errno));
+				return 1;
+			}
+			if (rc > 0)
+				rc = read(0, &c, 1);
+
+			pmd_test_exit();
+			if (rc < 0)
+				return 1;
+			prompt_exit();
+		}
 	}
 
+#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,
-- 
2.35.1