[PATCH liburing v2 07/12] t/socket: 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/socket.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/test/socket.c b/test/socket.c
index 6a3ea09..94c8e9f 100644
--- a/test/socket.c
+++ b/test/socket.c
@@ -7,53 +7,53 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <arpa/inet.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <pthread.h>
+#include <assert.h>
 
 #include "liburing.h"
 #include "helpers.h"
 
 static char str[] = "This is a test of send and recv over io_uring!";
 
 #define MAX_MSG	128
 
-#define PORT	10202
 #define HOST	"127.0.0.1"
 
 static int no_socket;
+static __be32 g_port;
 
 static int recv_prep(struct io_uring *ring, struct iovec *iov, int *sock,
 		     int registerfiles)
 {
 	struct sockaddr_in saddr;
 	struct io_uring_sqe *sqe;
 	int sockfd, ret, val, use_fd;
 
 	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;
 	}
+	g_port = saddr.sin_port;
 
 	if (registerfiles) {
 		ret = io_uring_register_files(ring, &sockfd, 1);
 		if (ret) {
 			fprintf(stderr, "file reg failed\n");
 			goto err;
 		}
@@ -240,17 +240,18 @@ static int do_send(int socket_direct, int alloc)
 		ret = io_uring_register_files(&ring, &fd, 1);
 		if (ret) {
 			fprintf(stderr, "file register %d\n", ret);
 			return 1;
 		}
 	}
 
+	assert(g_port != 0);
 	memset(&saddr, 0, sizeof(saddr));
 	saddr.sin_family = AF_INET;
-	saddr.sin_port = htons(PORT);
+	saddr.sin_port = g_port;
 	inet_pton(AF_INET, HOST, &saddr.sin_addr);
 
 	sqe = io_uring_get_sqe(&ring);
 	if (socket_direct) {
 		unsigned file_index = 0;
 		if (alloc)
 			file_index = IORING_FILE_INDEX_ALLOC - 1;
-- 
Ammar Faizi