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authorJim Meyering <jim@meyering.net>1997-11-15 05:41:02 +0000
committerJim Meyering <jim@meyering.net>1997-11-15 05:41:02 +0000
commite84c69c6cf4c97c275cfd87073732d1b8bc1266e (patch)
treef15d2600aef3ce823715abd87a9a74e1d12c9ced /m4
parent7ee6b0046fdc269fe895ef622c317ba468c993c7 (diff)
downloadcoreutils-e84c69c6cf4c97c275cfd87073732d1b8bc1266e.tar.xz
(bigtime_test): New function from Paul Eggert to detect SunOS4.1.4's
infinite looping mktime. Portability tweaks from Paul Eggert.
Diffstat (limited to 'm4')
-rw-r--r--m4/mktime.m451
1 files changed, 46 insertions, 5 deletions
diff --git a/m4/mktime.m4 b/m4/mktime.m4
index 9a9cc2ff4..c82183024 100644
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -8,7 +8,8 @@ dnl FIXME: when this goes back into automake, remove all jm_ prefixes
AC_DEFUN(jm_AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
- AC_CHECK_HEADERS(sys/time.h)
+ AC_CHECK_HEADERS(sys/time.h unistd.h)
+ AC_CHECK_FUNCS(alarm)
AC_CACHE_CHECK([for working mktime], jm_am_cv_func_working_mktime,
[AC_TRY_RUN(
changequote(<<, >>)dnl
@@ -25,11 +26,16 @@ changequote(<<, >>)dnl
# endif
#endif
+#if !HAVE_ALARM
+# define alarm(X) /* empty */
+#endif
+
static time_t time_t_max;
/* Values we'll use to set the TZ environment variable. */
static const char *const tz_strings[] = {
- NULL, "GMT0", "JST-9", "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
+ (const char *) 0, "GMT0", "JST-9",
+ "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
};
#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
@@ -37,10 +43,11 @@ static void
mktime_test (now)
time_t now;
{
- if (mktime (localtime (&now)) != now)
+ struct tm *lt;
+ if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
now = time_t_max - now;
- if (mktime (localtime (&now)) != now)
+ if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
}
@@ -61,11 +68,41 @@ irix_6_4_bug ()
exit (1);
}
+static void
+bigtime_test (j)
+ int j;
+{
+ struct tm tm;
+ time_t now;
+ tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
+ /* This test makes some buggy mktime implementations loop.
+ Give up after 10 seconds. */
+ alarm (10);
+ now = mktime (&tm);
+ alarm (0);
+ if (now != (time_t) -1)
+ {
+ struct tm *lt = localtime (&now);
+ if (! (lt
+ && lt->tm_year == tm.tm_year
+ && lt->tm_mon == tm.tm_mon
+ && lt->tm_mday == tm.tm_mday
+ && lt->tm_hour == tm.tm_hour
+ && lt->tm_min == tm.tm_min
+ && lt->tm_sec == tm.tm_sec
+ && lt->tm_yday == tm.tm_yday
+ && lt->tm_wday == tm.tm_wday
+ && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
+ == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
+ exit (1);
+ }
+}
+
int
main ()
{
time_t t, delta;
- int i;
+ int i, j;
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
@@ -80,6 +117,10 @@ main ()
mktime_test (t);
mktime_test ((time_t) 60 * 60);
mktime_test ((time_t) 60 * 60 * 24);
+
+ for (j = 1; 0 < j; j *= 2)
+ bigtime_test (j);
+ bigtime_test (j - 1);
}
irix_6_4_bug ();
exit (0);