D51492.diff
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	diff --git a/lib/libc/tests/db/Makefile b/lib/libc/tests/db/Makefile
	--- a/lib/libc/tests/db/Makefile
	+++ b/lib/libc/tests/db/Makefile
	@@ -7,6 +7,8 @@

	${PACKAGE}FILES+= README

	+ATF_TESTS_C+= dbm_open_test
	+
	NETBSD_ATF_TESTS_C+= db_hash_seq_test
	NETBSD_ATF_TESTS_SH+= db_test
	ATF_TESTS_SH_SED_db_test= -e 's,/bin/csh,/bin/cat,g'
	diff --git a/lib/libc/tests/db/dbm_open_test.c b/lib/libc/tests/db/dbm_open_test.c
	new file mode 100644
	--- /dev/null
	+++ b/lib/libc/tests/db/dbm_open_test.c
	@@ -0,0 +1,43 @@
	+/*-
	+ * Copyright (c) 2025 Klara, Inc.
	+ *
	+ * SPDX-License-Identifier: BSD-2-Clause
	+ */
	+
	+#include <sys/mman.h>
	+
	+#include <fcntl.h>
	+#include <ndbm.h>
	+#include <stdio.h>
	+
	+#include <atf-c.h>
	+
	+ATF_TC(dbm_open_missing_test);
	+ATF_TC_HEAD(dbm_open_missing_test, tc)
	+{
	+ atf_tc_set_md_var(tc, "descr",
	+ "Test dbm_open when creating a new database");
	+}
	+
	+ATF_TC_BODY(dbm_open_missing_test, tc)
	+{
	+ const char *path = "tmp";
	+ const char *dbname = "tmp.db";
	+
	+ /*
	+ * POSIX.1 specifies that a missing database file should
	+ * always get created if O_CREAT is present, except when
	+ * O_EXCL is specified as well.
	+ */
	+ ATF_CHECK(dbm_open(path, O_RDONLY, _PROT_ALL) == NULL);
	+ ATF_REQUIRE(!atf_utils_file_exists(dbname));
	+ ATF_CHECK(dbm_open(path, O_RDONLY \| O_CREAT, _PROT_ALL) != NULL);
	+ ATF_REQUIRE(atf_utils_file_exists(dbname));
	+ ATF_CHECK(dbm_open(path, O_RDONLY \| O_CREAT \| O_EXCL, _PROT_ALL) == NULL);
	+}
	+
	+ATF_TP_ADD_TCS(tp)
	+{
	+ ATF_TP_ADD_TC(tp, dbm_open_missing_test);
	+ return (atf_no_error());
	+}