[PATCH liburing 1/1] test: fix parallel send-zerocopy

[Pavel Begunkov <asml.silence@gmail.com>]

Dylan reported that running send-zerocopy in parallel often fails,
seems to trigger regardless whether it's zc or not. The problem here
is using the same port for all programs, let the kernel to select it.

Reported-by: Dylan Yudaken <dylany@meta.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 test/send-zerocopy.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/test/send-zerocopy.c b/test/send-zerocopy.c
index 16830df..ab56397 100644
--- a/test/send-zerocopy.c
+++ b/test/send-zerocopy.c
@@ -40,7 +40,6 @@
 
 #define MAX_MSG	128
 
-#define PORT	10200
 #define HOST	"127.0.0.1"
 #define HOSTV6	"::1"
 
@@ -190,7 +189,8 @@ static int create_socketpair_ip(struct sockaddr_storage *addr,
 				bool ipv6, bool client_connect,
 				bool msg_zc, bool tcp)
 {
-	int family, addr_size;
+	int family;
+	socklen_t addr_size;
 	int ret, val;
 	int listen_sock = -1;
 	int sock;
@@ -201,14 +201,14 @@ static int create_socketpair_ip(struct sockaddr_storage *addr,
 
 		family = AF_INET6;
 		saddr->sin6_family = family;
-		saddr->sin6_port = htons(PORT);
+		saddr->sin6_port = htons(0);
 		addr_size = sizeof(*saddr);
 	} else {
 		struct sockaddr_in *saddr = (struct sockaddr_in *)addr;
 
 		family = AF_INET;
 		saddr->sin_family = family;
-		saddr->sin_port = htons(PORT);
+		saddr->sin_port = htons(0);
 		saddr->sin_addr.s_addr = htonl(INADDR_ANY);
 		addr_size = sizeof(*saddr);
 	}
@@ -223,16 +223,19 @@ static int create_socketpair_ip(struct sockaddr_storage *addr,
 		perror("socket");
 		return 1;
 	}
-	val = 1;
-	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
-	val = 1;
-	setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val));
 
 	ret = bind(sock, (struct sockaddr *)addr, addr_size);
 	if (ret < 0) {
 		perror("bind");
 		return 1;
 	}
+
+	ret = getsockname(sock, (struct sockaddr *)addr, &addr_size);
+	if (ret < 0) {
+		fprintf(stderr, "getsockname failed %i\n", errno);
+		return 1;
+	}
+
 	if (tcp) {
 		ret = listen(sock, 128);
 		assert(ret != -1);
-- 
2.39.1