D44075.diff
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	diff --git a/lib/libc/tests/sys/Makefile b/lib/libc/tests/sys/Makefile
	--- a/lib/libc/tests/sys/Makefile
	+++ b/lib/libc/tests/sys/Makefile
	@@ -7,6 +7,7 @@
	ATF_TESTS_C+= brk_test
	.endif
	ATF_TESTS_C+= cpuset_test
	+ATF_TESTS_C+= errno_test
	ATF_TESTS_C+= queue_test
	ATF_TESTS_C+= sendfile_test

	diff --git a/lib/libc/tests/sys/errno_test.c b/lib/libc/tests/sys/errno_test.c
	new file mode 100644
	--- /dev/null
	+++ b/lib/libc/tests/sys/errno_test.c
	@@ -0,0 +1,36 @@
	+/*-
	+ * Copyright (c) 2024 The FreeBSD Foundation
	+ *
	+ * SPDX-License-Identifier: BSD-2-Clause
	+ *
	+ * This software were developed by Konstantin Belousov <kib@FreeBSD.org>
	+ * under sponsorship from the FreeBSD Foundation.
	+ */
	+
	+#include <errno.h>
	+#include <unistd.h>
	+
	+#include <atf-c.h>
	+
	+ATF_TC(errno_basic);
	+ATF_TC_HEAD(errno_basic, tc)
	+{
	+ atf_tc_set_md_var(tc, "descr",
	+ "Verify basic functionality of errno");
	+}
	+
	+ATF_TC_BODY(errno_basic, tc)
	+{
	+ int res;
	+
	+ res = unlink("/non/existent/file");
	+ ATF_REQUIRE(res == -1);
	+ ATF_REQUIRE(errno == ENOENT);
	+}
	+
	+ATF_TP_ADD_TCS(tp)
	+{
	+ ATF_TP_ADD_TC(tp, errno_basic);
	+
	+ return (atf_no_error());
	+}