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Index: lib/libc/tests/time/Makefile
===================================================================
--- lib/libc/tests/time/Makefile
+++ lib/libc/tests/time/Makefile
@@ -1,6 +1,12 @@
# $FreeBSD$
.include <bsd.own.mk>
+.include <src.opts.mk>
+
+ATF_TESTS_C= localtime_test
+.if ${MK_DETECT_TZ_CHANGES} != "no"
+CFLAGS.localtime_test.c+= -DDETECT_TZ_CHANGES
+.endif
NETBSD_ATF_TESTS_C= mktime_test
NETBSD_ATF_TESTS_C+= strptime_test
Index: lib/libc/tests/time/localtime_test.c
===================================================================
--- /dev/null
+++ lib/libc/tests/time/localtime_test.c
@@ -0,0 +1,227 @@
+/*-
+ * Copyright (c) 2021 Kyle Evans <kevans@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <atf-c.h>
+
+static bool chrooted;
+
+typedef void (*checker_fn)(struct tm *);
+static void check_for_cst(struct tm *);
+static void check_for_utc(struct tm *);
+
+static const struct tzcheck {
+ const char *tz;
+ checker_fn checker;
+ int delay;
+} tzcheck[] = {
+ {
+ .tz = "UTC",
+ .checker = &check_for_utc,
+ },
+ {
+ .tz = "CST6CDT",
+ .checker = &check_for_utc,
+ /* Implementation detail: not enough delay to re-check. */
+ },
+ {
+ .tz = "CST6CDT",
+ /* Will be ignored if we don't detect timezone changes. */
+ .checker = &check_for_cst,
+#ifdef DETECT_TZ_CHANGES
+ /*
+ * Implementation detail: tzcode will recheck every 61 seconds.
+ *
+ * Don't bother with the delay for stock builds so that we don't
+ * add the latency in the common case. Folks that want to test
+ * tz change detection need to opt-in with the usual build
+ * option.
+ */
+ .delay = 61,
+#endif
+ },
+};
+
+static void
+check_for_cst(struct tm *tmp)
+{
+
+ ATF_REQUIRE_STREQ(tmp->tm_isdst ? "CDT" : "CST", tmp->tm_zone);
+ /* -6 offset, -5 in CDT. Can't really validate DST. */
+ ATF_REQUIRE_EQ(-(60 * 60 * 6) + (tmp->tm_isdst ? (60 * 60) : 0),
+ tmp->tm_gmtoff);
+}
+
+static void
+check_for_utc(struct tm *tmp)
+{
+
+ ATF_REQUIRE_STREQ("UTC", tmp->tm_zone);
+ ATF_REQUIRE_EQ(0, tmp->tm_gmtoff);
+}
+
+static void
+copy_files(const char *path, const char *dest)
+{
+ pid_t p;
+ int status;
+
+ p = fork();
+ ATF_REQUIRE(p != -1);
+
+ if (p == 0) {
+ execlp("cp", "cp", "-R", path, dest, NULL);
+ _exit(1);
+ }
+
+ waitpid(p, &status, 0);
+ ATF_REQUIRE_EQ(0, WEXITSTATUS(status));
+}
+
+static void
+setup_chroot(void)
+{
+
+ ATF_REQUIRE_EQ(0, mkdir("etc", 0755));
+ ATF_REQUIRE_EQ(0, mkdir("usr", 0755));
+ ATF_REQUIRE_EQ(0, mkdir("usr/share", 0755));
+
+ /* Less string manipulation... */
+ copy_files("/usr/share/zoneinfo", "usr/share/zoneinfo");
+
+ ATF_REQUIRE_EQ(0, chroot("."));
+ chrooted = true;
+}
+
+static void
+setup_tz(const char *tz)
+{
+ char *tzfile, *tzpath;
+ struct stat sb;
+ int len;
+
+ if (!chrooted) {
+ setup_chroot();
+
+ /*
+ * This dance ensures that we start using /etc/localtime from
+ * the chroot and ignoring any TZ that may have been set in the
+ * environment.
+ */
+ setenv("TZ", "", 1);
+ tzset();
+ unsetenv("TZ");
+ }
+ tzfile = tzpath = NULL;
+ len = asprintf(&tzfile, "/usr/share/zoneinfo/%s", tz);
+ ATF_REQUIRE(len > 0);
+ if (stat(tzfile, &sb) == -1) {
+ ATF_REQUIRE(errno == ENOENT);
+ free(tzfile);
+ atf_tc_skip("needed timezone '%s' not installed", tz);
+ }
+
+ unlink("/etc/localtime");
+ ATF_REQUIRE_EQ(0, symlink(tzfile, "/etc/localtime"));
+ free(tzfile);
+ tzset();
+}
+
+ATF_TC_WITHOUT_HEAD(tmdata_cst);
+ATF_TC_BODY(tmdata_cst, tc)
+{
+ time_t clk;
+ struct tm tm;
+
+ clk = 0;
+ memset(&tm, '\0', sizeof(tm));
+
+ setup_tz("CST6CDT");
+ ATF_REQUIRE_EQ(&tm, localtime_r(&clk, &tm));
+ check_for_cst(&tm);
+}
+
+ATF_TC_WITHOUT_HEAD(tmdata_utc);
+ATF_TC_BODY(tmdata_utc, tc)
+{
+ time_t clk;
+ struct tm tm;
+
+ clk = 0;
+ memset(&tm, '\0', sizeof(tm));
+
+ setup_tz("UTC");
+ ATF_REQUIRE_EQ(&tm, localtime_r(&clk, &tm));
+ check_for_utc(&tm);
+}
+
+ATF_TC_WITHOUT_HEAD(tzchange);
+ATF_TC_BODY(tzchange, tc)
+{
+ const struct tzcheck *tzc;
+ time_t clk;
+ struct tm tm;
+
+ clk = 0;
+
+ setup_tz("UTC");
+ for (size_t i = 0; i < nitems(tzcheck); i++) {
+ tzc = &tzcheck[i];
+ memset(&tm, '\0', sizeof(tm));
+
+ setup_tz(tzc->tz);
+ sleep(tzc->delay);
+ ATF_REQUIRE_EQ(&tm, localtime_r(&clk, &tm));
+
+#ifdef DETECT_TZ_CHANGES
+ (*tzc->checker)(&tm);
+#else
+ check_for_utc(&tm);
+#endif
+ }
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+ ATF_TP_ADD_TC(tp, tmdata_cst);
+ ATF_TP_ADD_TC(tp, tmdata_utc);
+ ATF_TP_ADD_TC(tp, tzchange);
+
+ return (atf_no_error());
+}

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