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-rw-r--r--src/ClockTAI.cpp24
1 files changed, 20 insertions, 4 deletions
diff --git a/src/ClockTAI.cpp b/src/ClockTAI.cpp
index b14de8d..8d693a2 100644
--- a/src/ClockTAI.cpp
+++ b/src/ClockTAI.cpp
@@ -71,9 +71,20 @@ const int64_t ntp_unix_offset = 2208988800L;
// distribution
static array<const char*, 2> tai_urls = {
"http://www.ietf.org/timezones/data/leap-seconds.list",
- "https://raw.githubusercontent.com/eggert/tz/master/leap-seconds.list"};
+ "https://raw.githubusercontent.com/eggert/tz/master/leap-seconds.list",
+};
-static const char* tai_ietf_cache_file = "/tmp/odr-dabmux-leap-seconds.cache";
+// A downloaded bulletin will be saved in the first location of tai_cache_locations
+static array<const char*, 2> tai_cache_locations = {
+ // According to the Filesystem Hierarchy Standard, the data in
+ // /var/tmp "must not be deleted when the system is booted.". This is why
+ // this location has been added.
+ "/var/tmp/odr-dabmux-leap-seconds.cache",
+
+ // The old location in /tmp is less appropriate, as /tmp can get cleared
+ // on a reboot.
+ "/tmp/odr-dabmux-leap-seconds.cache",
+};
ClockTAI::ClockTAI() :
RemoteControllable("clocktai")
@@ -94,7 +105,12 @@ int ClockTAI::get_valid_offset()
offset_valid = true;
}
else {
- load_bulletin_from_file(tai_ietf_cache_file);
+ for (const auto& cache_file : tai_cache_locations) {
+ load_bulletin_from_file(cache_file);
+ if (bulletin_is_valid()) {
+ break;
+ }
+ }
if (bulletin_is_valid()) {
#if TEST
@@ -125,7 +141,7 @@ int ClockTAI::get_valid_offset()
}
if (offset_valid) {
- update_cache(tai_ietf_cache_file);
+ update_cache(tai_cache_locations[0]);
break;
}
}