From 8d3991d6cca1a57ef5c48460313a07f709c89248 Mon Sep 17 00:00:00 2001
From: "Luke T. Shumaker" <lukeshu@lukeshu.com>
Date: Sat, 22 Mar 2025 16:06:35 -0600
Subject: Enable running tests in parallel

---
 GNUmakefile                    | 5 ++++-
 lib9p/tests/runtest            | 5 +++--
 lib9p/tests/test_server/main.c | 9 +++++++--
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/GNUmakefile b/GNUmakefile
index 1311b6e..bae7357 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -74,6 +74,9 @@ generate-clean:
 platforms := rp2040 host # $(shell sed -nE 's/if *\(PICO_PLATFORM STREQUAL "(.*)"\)/\1/p' cmd/*/CMakeLists.txt)
 build_types = Debug Release RelWithDebInfo MinSizeRel
 
+export CTEST_PARALLEL_LEVEL = 0
+export CTEST_OUTPUT_ON_FAILURE = 1
+
 build: $(foreach t,$(build_types),$(foreach p,$(platforms),build/$p-$t/build))
 .PHONY: build
 
@@ -89,7 +92,7 @@ check: build
 .PHONY: check
 
 $(foreach t,$(build_types),$(foreach p,$(platforms),build/$p-$t/check)): build/%/check: build/%/Makefile
-	CTEST_OUTPUT_ON_FAILURE=1 $(MAKE) -C $(<D) test
+	$(MAKE) -C $(<D) test
 .PHONY: $(foreach t,$(build_types),$(foreach p,$(platforms),build/$p-$t/check))
 
 # `lint` and `format` ##########################################################
diff --git a/lib9p/tests/runtest b/lib9p/tests/runtest
index c2f6c41..3a46f28 100755
--- a/lib9p/tests/runtest
+++ b/lib9p/tests/runtest
@@ -7,11 +7,12 @@
 set -euE -o pipefail
 set -x
 
-valgrind --error-exitcode=2 ./tests/test_server/test_server &
+port=$(python -c 'import socket; s=socket.socket(); s.bind(("", 0)); print(s.getsockname()[1]); s.close()')
+valgrind --error-exitcode=2 ./tests/test_server/test_server "$port" &
 server_pid=$!
 # shellcheck disable=SC2064
 trap "kill $server_pid || true; wait $server_pid || true" EXIT
-server_addr='localhost:9000'
+server_addr="localhost:${port}"
 
 client=(9p -a "$server_addr")
 
diff --git a/lib9p/tests/test_server/main.c b/lib9p/tests/test_server/main.c
index c60dd71..59a21ec 100644
--- a/lib9p/tests/test_server/main.c
+++ b/lib9p/tests/test_server/main.c
@@ -5,6 +5,7 @@
  */
 
 #include <error.h>
+#include <stdlib.h> /* for atoi() */
 
 #include <lib9p/srv.h>
 #include <libcr/coroutine.h>
@@ -32,6 +33,7 @@ static lo_interface lib9p_srv_file get_root(struct lib9p_srv_ctx *, struct lib9p
 const char *hexdig = "0123456789abcdef";
 
 struct {
+	uint16_t                        port;
 	struct hostnet_tcp_listener     listeners[CONFIG_SRV9P_NUM_CONNS];
 	struct lib9p_srv                srv;
 } globals = {
@@ -146,7 +148,7 @@ static COROUTINE read_cr(void *_i) {
 	int i = *((int *)_i);
 	cr_begin();
 
-	hostnet_tcp_listener_init(&globals.listeners[i], 9000);
+	hostnet_tcp_listener_init(&globals.listeners[i], globals.port);
 
 	lib9p_srv_read_cr(&globals.srv, lo_box_hostnet_tcplist_as_net_stream_listener(&globals.listeners[i]));
 
@@ -172,7 +174,10 @@ static COROUTINE init_cr(void *) {
 	cr_exit();
 }
 
-int main() {
+int main(int argc, char *argv[]) {
+	if (argc != 2)
+		error(2, 0, "usage: %s PORT_NUMBER", argv[0]);
+	globals.port = atoi(argv[1]);
 	struct hostclock clock_monotonic = {
 		.clock_id = CLOCK_MONOTONIC,
 	};
-- 
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