[PATCH liburing v2 10/12] t/recv-msgall: Don't use a static port number

[Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>]

From: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>

Don't use a static port number. It might already be in use, resulting
in a test failure. Use an ephemeral port to make this test reliable.

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/recv-msgall.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/test/recv-msgall.c b/test/recv-msgall.c
index a6f7cfc..ae123e4 100644
--- a/test/recv-msgall.c
+++ b/test/recv-msgall.c
@@ -12,45 +12,43 @@
 #include <sys/socket.h>
 #include <pthread.h>
 
 #include "liburing.h"
 #include "helpers.h"
 
 #define MAX_MSG	128
-
-#define PORT	10201
 #define HOST	"127.0.0.1"
+static __be16 bind_port;
 
 static int recv_prep(struct io_uring *ring, struct iovec *iov, int *sock,
 		     int use_recvmsg)
 {
 	struct sockaddr_in saddr;
 	struct io_uring_sqe *sqe;
 	int sockfd, ret, val;
 	struct msghdr msg = { };
 
 	memset(&saddr, 0, sizeof(saddr));
 	saddr.sin_family = AF_INET;
 	saddr.sin_addr.s_addr = htonl(INADDR_ANY);
-	saddr.sin_port = htons(PORT);
 
 	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 	if (sockfd < 0) {
 		perror("socket");
 		return 1;
 	}
 
 	val = 1;
 	setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 
-	ret = bind(sockfd, (struct sockaddr *)&saddr, sizeof(saddr));
-	if (ret < 0) {
+	if (t_bind_ephemeral_port(sockfd, &saddr)) {
 		perror("bind");
 		goto err;
 	}
+	bind_port = saddr.sin_port;
 
 	sqe = io_uring_get_sqe(ring);
 	if (!use_recvmsg) {
 		io_uring_prep_recv(sqe, sockfd, iov->iov_base, iov->iov_len,
 					MSG_WAITALL);
 	} else {
 		msg.msg_namelen = sizeof(struct sockaddr_in);
@@ -161,15 +159,15 @@ static int do_send(void)
 
 	buf = malloc(MAX_MSG * sizeof(int));
 	for (i = 0; i < MAX_MSG; i++)
 		buf[i] = i;
 
 	memset(&saddr, 0, sizeof(saddr));
 	saddr.sin_family = AF_INET;
-	saddr.sin_port = htons(PORT);
+	saddr.sin_port = bind_port;
 	inet_pton(AF_INET, HOST, &saddr.sin_addr);
 
 	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
 	if (sockfd < 0) {
 		perror("socket");
 		return 1;
 	}
-- 
Ammar Faizi