vsock/test: Introduce enable_so_linger() helper

Add a helper function that sets SO_LINGER. Adapt the caller.

Signed-off-by: Michal Luczaj <mhal@rbox.co>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://patch.msgid.link/20250522-vsock-linger-v6-4-2ad00b0e447e@rbox.co
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: mmhal

tools/testing/vsock/util.c

@@ -823,3 +823,16 @@ void enable_so_zerocopy_check(int fd)
 	setsockopt_int_check(fd, SOL_SOCKET, SO_ZEROCOPY, 1,
 			     "setsockopt SO_ZEROCOPY");
 }
+
+void enable_so_linger(int fd, int timeout)
+{
+	struct linger optval = {
+		.l_onoff = 1,
+		.l_linger = timeout
+	};
+
+	if (setsockopt(fd, SOL_SOCKET, SO_LINGER, &optval, sizeof(optval))) {
+		perror("setsockopt(SO_LINGER)");
+		exit(EXIT_FAILURE);
+	}
+}

tools/testing/vsock/util.h

@@ -80,4 +80,5 @@ void setsockopt_int_check(int fd, int level, int optname, int val,
 void setsockopt_timeval_check(int fd, int level, int optname,
 			      struct timeval val, char const *errmsg);
 void enable_so_zerocopy_check(int fd);
+void enable_so_linger(int fd, int timeout);
 #endif /* UTIL_H */

tools/testing/vsock/vsock_test.c

@@ -1813,10 +1813,6 @@ static void test_stream_connect_retry_server(const struct test_opts *opts)
 
 static void test_stream_linger_client(const struct test_opts *opts)
 {
-	struct linger optval = {
-		.l_onoff = 1,
-		.l_linger = 1
-	};
 	int fd;
 
 	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
@@ -1825,11 +1821,7 @@ static void test_stream_linger_client(const struct test_opts *opts)
 		exit(EXIT_FAILURE);
 	}
 
-	if (setsockopt(fd, SOL_SOCKET, SO_LINGER, &optval, sizeof(optval))) {
-		perror("setsockopt(SO_LINGER)");
-		exit(EXIT_FAILURE);
-	}
-
+	enable_so_linger(fd, 1);
 	close(fd);
 }