[PATCH liburing v2 06/12] t/files-exit-hang-poll: Don't brute force the port number

[Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>]

From: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>

Don't brute force the port number, use `t_bind_ephemeral_port()`,
much simpler and reliable for choosing a port number that is not
in use.

Cc: Dylan Yudaken <dylany@xxxxxx>
Cc: Facebook Kernel Team <kernel-team@xxxxxx>
Cc: Pavel Begunkov <asml.silence@xxxxxxxxx>
Reviewed-by: Alviro Iskandar Setiawan <alviro.iskandar@xxxxxxxxxxx>
Tested-by: Alviro Iskandar Setiawan <alviro.iskandar@xxxxxxxxxxx>
Signed-off-by: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>
---
 test/files-exit-hang-poll.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/test/files-exit-hang-poll.c b/test/files-exit-hang-poll.c
index 0c609f1..04febc8 100644
--- a/test/files-exit-hang-poll.c
+++ b/test/files-exit-hang-poll.c
@@ -15,16 +15,14 @@
 #include <unistd.h>
 #include <poll.h>
 #include "liburing.h"
 #include "helpers.h"
 
 #define BACKLOG 512
 
-#define PORT 9100
-
 static struct io_uring ring;
 
 static void add_poll(struct io_uring *ring, int fd)
 {
 	struct io_uring_sqe *sqe;
 
 	sqe = io_uring_get_sqe(ring);
@@ -60,15 +58,14 @@ static void alarm_sig(int sig)
 
 int main(int argc, char *argv[])
 {
 	struct sockaddr_in serv_addr;
 	struct io_uring_cqe *cqe;
 	int ret, sock_listen_fd;
 	const int val = 1;
-	int i;
 
 	if (argc > 1)
 		return T_EXIT_SKIP;
 
 	sock_listen_fd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
 	if (sock_listen_fd < 0) {
 		perror("socket");
@@ -77,28 +74,17 @@ int main(int argc, char *argv[])
 
 	setsockopt(sock_listen_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 
 	memset(&serv_addr, 0, sizeof(serv_addr));
 	serv_addr.sin_family = AF_INET;
 	serv_addr.sin_addr.s_addr = INADDR_ANY;
 
-	for (i = 0; i < 100; i++) {
-		serv_addr.sin_port = htons(PORT + i);
-
-		ret = bind(sock_listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
-		if (!ret)
-			break;
-		if (errno != EADDRINUSE) {
-			fprintf(stderr, "bind: %s\n", strerror(errno));
-			return T_EXIT_FAIL;
-		}
-		if (i == 99) {
-			printf("Gave up on finding a port, skipping\n");
-			goto skip;
-		}
+	if (t_bind_ephemeral_port(sock_listen_fd, &serv_addr)) {
+		perror("bind");
+		return T_EXIT_FAIL;
 	}
 
 	if (listen(sock_listen_fd, BACKLOG) < 0) {
 		perror("Error listening on socket\n");
 		return T_EXIT_FAIL;
 	}
 
@@ -121,11 +107,8 @@ int main(int argc, char *argv[])
 	if (ret) {
 		fprintf(stderr, "wait_cqe=%d\n", ret);
 		return T_EXIT_FAIL;
 	}
 
 	io_uring_queue_exit(&ring);
 	return T_EXIT_PASS;
-skip:
-	io_uring_queue_exit(&ring);
-	return T_EXIT_SKIP;
 }
-- 
Ammar Faizi