1 files changed, 69 insertions, 0 deletions
diff --git a/lib/libc/tests/stdlib/getenv_r_test.c b/lib/libc/tests/stdlib/getenv_r_test.c
new file mode 100644
index 000000000000..8085b92b1064
--- /dev/null
+++ b/lib/libc/tests/stdlib/getenv_r_test.c
@@ -0,0 +1,69 @@
+/*-
+ * Copyright (c) 2025 Klara, Inc.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <atf-c.h>
+
+ATF_TC_WITHOUT_HEAD(getenv_r_ok);
+ATF_TC_BODY(getenv_r_ok, tc)
+{
+	const char *ident = atf_tc_get_ident(tc);
+	char buf[256];
+
+	ATF_REQUIRE_EQ(0, setenv("ATF_TC_IDENT", ident, 1));
+	ATF_REQUIRE_EQ(0, getenv_r("ATF_TC_IDENT", buf, sizeof(buf)));
+	ATF_REQUIRE_STREQ(ident, buf);
+}
+
+ATF_TC_WITHOUT_HEAD(getenv_r_einval);
+ATF_TC_BODY(getenv_r_einval, tc)
+{
+	char buf[256];
+
+	errno = 0;
+	ATF_REQUIRE_EQ(-1, getenv_r(NULL, buf, sizeof(buf)));
+	ATF_REQUIRE_EQ(EINVAL, errno);
+	errno = 0;
+	ATF_REQUIRE_EQ(-1, getenv_r("", buf, sizeof(buf)));
+	ATF_REQUIRE_EQ(EINVAL, errno);
+	errno = 0;
+	ATF_REQUIRE_EQ(-1, getenv_r("A=B", buf, sizeof(buf)));
+	ATF_REQUIRE_EQ(EINVAL, errno);
+}
+
+ATF_TC_WITHOUT_HEAD(getenv_r_enoent);
+ATF_TC_BODY(getenv_r_enoent, tc)
+{
+	char buf[256];
+
+	errno = 0;
+	ATF_REQUIRE_EQ(-1, getenv_r("no such variable", buf, sizeof(buf)));
+	ATF_REQUIRE_EQ(ENOENT, errno);
+}
+
+ATF_TC_WITHOUT_HEAD(getenv_r_erange);
+ATF_TC_BODY(getenv_r_erange, tc)
+{
+	const char *ident = atf_tc_get_ident(tc);
+	char buf[256];
+
+	ATF_REQUIRE_EQ(0, setenv("ATF_TC_IDENT", ident, 1));
+	errno = 0;
+	ATF_REQUIRE_EQ(-1, getenv_r("ATF_TC_IDENT", buf, strlen(ident)));
+	ATF_REQUIRE_EQ(ERANGE, errno);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, getenv_r_ok);
+	ATF_TP_ADD_TC(tp, getenv_r_einval);
+	ATF_TP_ADD_TC(tp, getenv_r_enoent);
+	ATF_TP_ADD_TC(tp, getenv_r_erange);
+	return (atf_no_error());
+}