tests: posix: eventfd_basic: add new test

Introduce new test for eventfd, which will test it in only basic
scope. The real reason why this is introduced is to have a test with
minimal set of configuration dependencies, such as disabled
pthreads (compared to full tests/posix/eventfd/ variant). This allows to
test eventfd mechanism with both POSIX_API=n and POSIX_API=y.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>

tests/posix/eventfd_basic/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(eventfd_basic)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/posix/eventfd_basic/prj.conf

@@ -0,0 +1,12 @@
+# Networking config
+CONFIG_NETWORKING=y
+CONFIG_NET_TEST=y
+CONFIG_NET_SOCKETS=y
+
+# Network driver config
+CONFIG_TEST_RANDOM_GENERATOR=y
+
+CONFIG_ZTEST=y
+
+CONFIG_EVENTFD=y
+CONFIG_EVENTFD_MAX=1

tests/posix/eventfd_basic/src/main.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2020 Tobias Svehagen
+ * Copyright (c) 2020 Grinn
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ztest.h>
+
+#include <net/socket.h>
+
+#ifdef CONFIG_POSIX_API
+#include <sys/eventfd.h>
+#else
+#include <posix/sys/eventfd.h>
+#endif
+
+static void test_eventfd(void)
+{
+	int fd = eventfd(0, 0);
+
+	zassert_true(fd >= 0, "fd == %d", fd);
+
+	zsock_close(fd);
+}
+
+static void test_eventfd_write_then_read(void)
+{
+	eventfd_t val;
+	int fd, ret;
+
+	fd = eventfd(0, 0);
+	zassert_true(fd >= 0, "fd == %d", fd);
+
+	ret = eventfd_write(fd, 3);
+	zassert_true(ret == 0, "write ret %d", ret);
+
+	ret = eventfd_write(fd, 2);
+	zassert_true(ret == 0, "write ret %d", ret);
+
+	ret = eventfd_read(fd, &val);
+	zassert_true(ret == 0, "read ret %d", ret);
+	zassert_true(val == 5, "val == %d", val);
+
+	zsock_close(fd);
+
+	/* Test EFD_SEMAPHORE */
+
+	fd = eventfd(0, EFD_SEMAPHORE);
+	zassert_true(fd >= 0, "fd == %d", fd);
+
+	ret = eventfd_write(fd, 3);
+	zassert_true(ret == 0, "write ret %d", ret);
+
+	ret = eventfd_write(fd, 2);
+	zassert_true(ret == 0, "write ret %d", ret);
+
+	ret = eventfd_read(fd, &val);
+	zassert_true(ret == 0, "read ret %d", ret);
+	zassert_true(val == 1, "val == %d", val);
+
+	zsock_close(fd);
+}
+
+void test_main(void)
+{
+	ztest_test_suite(test_eventfd_basic,
+				ztest_unit_test(test_eventfd),
+				ztest_unit_test(test_eventfd_write_then_read)
+				);
+	ztest_run_test_suite(test_eventfd_basic);
+}

tests/posix/eventfd_basic/testcase.yaml

@@ -0,0 +1,11 @@
+common:
+  arch_exclude: posix
+  min_ram: 32
+  tags: posix pthread eventfd
+tests:
+  posix.eventfd_basic:
+    extra_configs:
+      - CONFIG_POSIX_API=n
+  posix.eventfd_basic.posix_api:
+    extra_configs:
+      - CONFIG_POSIX_API=y