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chrony/017d6f8f5630071e2a532f58f9513757d94ac7d5.patch

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From 017d6f8f5630071e2a532f58f9513757d94ac7d5 Mon Sep 17 00:00:00 2001
From: Patrick Oppenlander <patrick.oppenlander@gmail.com>
Date: Thu, 8 Feb 2024 14:36:25 +1100
Subject: [PATCH] reference: move leap second source into leapdb
Separate out source of leap second data into a new module in preparation
for supporting more sources such as leap-seconds.list.
---
Makefile.in | 2 +-
leapdb.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++
leapdb.h | 37 +++++++++++++
main.c | 3 ++
reference.c | 99 +++--------------------------------
5 files changed, 194 insertions(+), 94 deletions(-)
create mode 100644 leapdb.c
create mode 100644 leapdb.h
diff --git a/Makefile.in b/Makefile.in
index 101e0c69..318109bb 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -37,7 +37,7 @@ GETDATE_CFLAGS = @GETDATE_CFLAGS@
EXTRA_OBJS = @EXTRA_OBJS@
-OBJS = array.o cmdparse.o conf.o local.o logging.o main.o memory.o quantiles.o \
+OBJS = array.o cmdparse.o conf.o leapdb.o local.o logging.o main.o memory.o quantiles.o \
reference.o regress.o rtc.o samplefilt.o sched.o socket.o sources.o sourcestats.o \
stubs.o smooth.o sys.o sys_null.o tempcomp.o util.o $(EXTRA_OBJS)
diff --git a/leapdb.c b/leapdb.c
new file mode 100644
index 00000000..676a0d5d
--- /dev/null
+++ b/leapdb.c
@@ -0,0 +1,147 @@
+/*
+ chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar 2009-2018, 2020, 2022
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ **********************************************************************
+
+ =======================================================================
+
+ This module provides leap second information. */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "conf.h"
+#include "leapdb.h"
+#include "logging.h"
+
+/* ================================================== */
+
+/* Name of a system timezone containing leap seconds occuring at midnight */
+static char *leap_tzname;
+
+/* ================================================== */
+
+static NTP_Leap
+get_tz_leap(time_t when, int *tai_offset)
+{
+ static time_t last_tz_leap_check;
+ static NTP_Leap tz_leap;
+ static int tz_tai_offset;
+
+ struct tm stm, *tm;
+ time_t t;
+ char *tz_env, tz_orig[128];
+
+ *tai_offset = tz_tai_offset;
+
+ /* Do this check at most twice a day */
+ when = when / (12 * 3600) * (12 * 3600);
+ if (last_tz_leap_check == when)
+ return tz_leap;
+
+ last_tz_leap_check = when;
+ tz_leap = LEAP_Normal;
+ tz_tai_offset = 0;
+
+ tm = gmtime(&when);
+ if (!tm)
+ return tz_leap;
+
+ stm = *tm;
+
+ /* Temporarily switch to the timezone containing leap seconds */
+ tz_env = getenv("TZ");
+ if (tz_env) {
+ if (strlen(tz_env) >= sizeof (tz_orig))
+ return tz_leap;
+ strcpy(tz_orig, tz_env);
+ }
+ setenv("TZ", leap_tzname, 1);
+ tzset();
+
+ /* Get the TAI-UTC offset, which started at the epoch at 10 seconds */
+ t = mktime(&stm);
+ if (t != -1)
+ tz_tai_offset = t - when + 10;
+
+ /* Set the time to 23:59:60 and see how it overflows in mktime() */
+ stm.tm_sec = 60;
+ stm.tm_min = 59;
+ stm.tm_hour = 23;
+
+ t = mktime(&stm);
+
+ if (tz_env)
+ setenv("TZ", tz_orig, 1);
+ else
+ unsetenv("TZ");
+ tzset();
+
+ if (t == -1)
+ return tz_leap;
+
+ if (stm.tm_sec == 60)
+ tz_leap = LEAP_InsertSecond;
+ else if (stm.tm_sec == 1)
+ tz_leap = LEAP_DeleteSecond;
+
+ *tai_offset = tz_tai_offset;
+
+ return tz_leap;
+}
+
+/* ================================================== */
+
+void
+LDB_Initialise(void)
+{
+ int tai_offset;
+
+ leap_tzname = CNF_GetLeapSecTimezone();
+ if (leap_tzname) {
+ /* Check that the timezone has good data for Jun 30 2012 and Dec 31 2012 */
+ if (get_tz_leap(1341014400, &tai_offset) == LEAP_InsertSecond && tai_offset == 34 &&
+ get_tz_leap(1356912000, &tai_offset) == LEAP_Normal && tai_offset == 35) {
+ LOG(LOGS_INFO, "Using %s timezone to obtain leap second data", leap_tzname);
+ } else {
+ LOG(LOGS_WARN, "Timezone %s failed leap second check, ignoring", leap_tzname);
+ leap_tzname = NULL;
+ }
+ }
+}
+
+/* ================================================== */
+
+NTP_Leap
+LDB_GetLeap(time_t when, int *tai_offset)
+{
+ *tai_offset = 0;
+ if (leap_tzname)
+ return get_tz_leap(when, tai_offset);
+ return LEAP_Normal;
+}
+
+/* ================================================== */
+
+void
+LDB_Finalise(void)
+{
+ /* Nothing to do */
+}
diff --git a/leapdb.h b/leapdb.h
new file mode 100644
index 00000000..eab24141
--- /dev/null
+++ b/leapdb.h
@@ -0,0 +1,37 @@
+/*
+ chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Patrick Oppenlander 2023
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ **********************************************************************
+
+ =======================================================================
+
+ This module provides leap second information.
+
+ */
+
+#ifndef GOT_LEAPDB_H
+#define GOT_LEAPDB_H
+
+#include "ntp.h"
+
+extern void LDB_Initialise(void);
+extern NTP_Leap LDB_GetLeap(time_t when, int *tai_offset);
+extern void LDB_Finalise(void);
+
+#endif /* GOT_LEAPDB_H */
diff --git a/main.c b/main.c
index 21d0fe7f..cb240640 100644
--- a/main.c
+++ b/main.c
@@ -32,6 +32,7 @@
#include "main.h"
#include "sched.h"
+#include "leapdb.h"
#include "local.h"
#include "sys.h"
#include "ntp_io.h"
@@ -134,6 +135,7 @@ MAI_CleanupAndExit(void)
RCL_Finalise();
SRC_Finalise();
REF_Finalise();
+ LDB_Finalise();
RTC_Finalise();
SYS_Finalise();
@@ -655,6 +657,7 @@ int main
if (!geteuid())
LOG(LOGS_WARN, "Running with root privileges");
+ LDB_Initialise();
REF_Initialise();
SST_Initialise();
NSR_Initialise();
diff --git a/reference.c b/reference.c
index 97dfbe98..1ac6cb93 100644
--- a/reference.c
+++ b/reference.c
@@ -33,6 +33,7 @@
#include "reference.h"
#include "util.h"
#include "conf.h"
+#include "leapdb.h"
#include "logging.h"
#include "local.h"
#include "sched.h"
@@ -122,9 +123,6 @@ static int leap_in_progress;
/* Timer for the leap second handler */
static SCH_TimeoutID leap_timeout_id;
-/* Name of a system timezone containing leap seconds occuring at midnight */
-static char *leap_tzname;
-
/* ================================================== */
static LOG_FileID logfileid;
@@ -155,7 +153,6 @@ static int ref_adjustments;
/* ================================================== */
-static NTP_Leap get_tz_leap(time_t when, int *tai_offset);
static void update_leap_status(NTP_Leap leap, time_t now, int reset);
/* ================================================== */
@@ -195,7 +192,6 @@ REF_Initialise(void)
FILE *in;
double file_freq_ppm, file_skew_ppm;
double our_frequency_ppm;
- int tai_offset;
mode = REF_ModeNormal;
are_we_synchronised = 0;
@@ -260,18 +256,6 @@ REF_Initialise(void)
if (leap_mode == REF_LeapModeSystem && !LCL_CanSystemLeap())
leap_mode = REF_LeapModeStep;
- leap_tzname = CNF_GetLeapSecTimezone();
- if (leap_tzname) {
- /* Check that the timezone has good data for Jun 30 2012 and Dec 31 2012 */
- if (get_tz_leap(1341014400, &tai_offset) == LEAP_InsertSecond && tai_offset == 34 &&
- get_tz_leap(1356912000, &tai_offset) == LEAP_Normal && tai_offset == 35) {
- LOG(LOGS_INFO, "Using %s timezone to obtain leap second data", leap_tzname);
- } else {
- LOG(LOGS_WARN, "Timezone %s failed leap second check, ignoring", leap_tzname);
- leap_tzname = NULL;
- }
- }
-
CNF_GetMakeStep(&make_step_limit, &make_step_threshold);
CNF_GetMaxChange(&max_offset_delay, &max_offset_ignore, &max_offset);
CNF_GetMailOnChange(&do_mail_change, &mail_change_threshold, &mail_change_user);
@@ -593,77 +577,6 @@ is_leap_second_day(time_t when)
/* ================================================== */
-static NTP_Leap
-get_tz_leap(time_t when, int *tai_offset)
-{
- static time_t last_tz_leap_check;
- static NTP_Leap tz_leap;
- static int tz_tai_offset;
-
- struct tm stm, *tm;
- time_t t;
- char *tz_env, tz_orig[128];
-
- *tai_offset = tz_tai_offset;
-
- /* Do this check at most twice a day */
- when = when / (12 * 3600) * (12 * 3600);
- if (last_tz_leap_check == when)
- return tz_leap;
-
- last_tz_leap_check = when;
- tz_leap = LEAP_Normal;
- tz_tai_offset = 0;
-
- tm = gmtime(&when);
- if (!tm)
- return tz_leap;
-
- stm = *tm;
-
- /* Temporarily switch to the timezone containing leap seconds */
- tz_env = getenv("TZ");
- if (tz_env) {
- if (strlen(tz_env) >= sizeof (tz_orig))
- return tz_leap;
- strcpy(tz_orig, tz_env);
- }
- setenv("TZ", leap_tzname, 1);
- tzset();
-
- /* Get the TAI-UTC offset, which started at the epoch at 10 seconds */
- t = mktime(&stm);
- if (t != -1)
- tz_tai_offset = t - when + 10;
-
- /* Set the time to 23:59:60 and see how it overflows in mktime() */
- stm.tm_sec = 60;
- stm.tm_min = 59;
- stm.tm_hour = 23;
-
- t = mktime(&stm);
-
- if (tz_env)
- setenv("TZ", tz_orig, 1);
- else
- unsetenv("TZ");
- tzset();
-
- if (t == -1)
- return tz_leap;
-
- if (stm.tm_sec == 60)
- tz_leap = LEAP_InsertSecond;
- else if (stm.tm_sec == 1)
- tz_leap = LEAP_DeleteSecond;
-
- *tai_offset = tz_tai_offset;
-
- return tz_leap;
-}
-
-/* ================================================== */
-
static void
leap_end_timeout(void *arg)
{
@@ -751,16 +664,16 @@ set_leap_timeout(time_t now)
static void
update_leap_status(NTP_Leap leap, time_t now, int reset)
{
- NTP_Leap tz_leap;
+ NTP_Leap ldb_leap;
int leap_sec, tai_offset;
leap_sec = 0;
tai_offset = 0;
- if (leap_tzname && now) {
- tz_leap = get_tz_leap(now, &tai_offset);
+ if (now) {
+ ldb_leap = LDB_GetLeap(now, &tai_offset);
if (leap == LEAP_Normal)
- leap = tz_leap;
+ leap = ldb_leap;
}
if (leap == LEAP_InsertSecond || leap == LEAP_DeleteSecond) {
@@ -1398,7 +1311,7 @@ REF_GetTaiOffset(struct timespec *ts)
{
int tai_offset;
- get_tz_leap(ts->tv_sec, &tai_offset);
+ LDB_GetLeap(ts->tv_sec, &tai_offset);
return tai_offset;
}
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