[PATCH v2 07/13] examples/vhost_blk: do not tear down from signal handler

[Stephen Hemminger <stephen@networkplumber.org>]

The SIGINT handler destroyed the controller and called exit() from
signal context.

Set a flag, break the sleep loop, and destroy the controller in main().

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
---
 examples/vhost_blk/vhost_blk.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/examples/vhost_blk/vhost_blk.c b/examples/vhost_blk/vhost_blk.c
index 9c9e326949..0665d9fb51 100644
--- a/examples/vhost_blk/vhost_blk.c
+++ b/examples/vhost_blk/vhost_blk.c
@@ -850,24 +850,18 @@ vhost_blk_ctrlr_destroy(struct vhost_blk_ctrlr *ctrlr)
 	rte_vhost_driver_unregister(dev_pathname);
 }
 
+/* Set by the SIGINT handler to break the main loop. */
+static volatile sig_atomic_t quit;
+
 static void
 signal_handler(__rte_unused int signum)
 {
-	struct vhost_blk_ctrlr *ctrlr;
-
-	ctrlr = vhost_blk_ctrlr_find(dev_pathname);
-	if (ctrlr == NULL)
-		return;
-
-	if (ctrlr->started)
-		destroy_device(ctrlr->vid);
-
-	vhost_blk_ctrlr_destroy(ctrlr);
-	exit(0);
+	quit = 1;
 }
 
 int main(int argc, char *argv[])
 {
+	struct vhost_blk_ctrlr *ctrlr;
 	int ret;
 
 	/* init EAL */
@@ -895,9 +889,17 @@ int main(int argc, char *argv[])
 	}
 
 	/* loop for exit the application */
-	while (1)
+	while (!quit)
 		sleep(1);
 
+	ctrlr = vhost_blk_ctrlr_find(dev_pathname);
+	if (ctrlr != NULL) {
+		if (ctrlr->started)
+			destroy_device(ctrlr->vid);
+
+		vhost_blk_ctrlr_destroy(ctrlr);
+	}
+
 	/* clean up the EAL */
 	rte_eal_cleanup();
 
-- 
2.53.0