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-rw-r--r--erts/doc/src/erl.xml5
-rw-r--r--erts/doc/src/erlang.xml7
-rwxr-xr-xerts/emulator/beam/erl_bif_info.c5
-rw-r--r--erts/emulator/test/system_info_SUITE.erl1
-rw-r--r--erts/preloaded/src/erlang.erl1
5 files changed, 18 insertions, 1 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 9724a1345a..f8f4d14436 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -495,7 +495,7 @@
<c><![CDATA[werl]]></c>, not <c><![CDATA[erl]]></c> (<c><![CDATA[oldshell]]></c>). Note also that
<c><![CDATA[Ctrl-Break]]></c> is used instead of <c><![CDATA[Ctrl-C]]></c> on Windows.</p>
</item>
- <tag><c><![CDATA[+c]]></c></tag>
+ <tag><marker id="+c"><c><![CDATA[+c]]></c></marker></tag>
<item>
<p>Disable compensation for sudden changes of system time.</p>
<p>Normally, <c><![CDATA[erlang:now/0]]></c> will not immediately reflect
@@ -510,6 +510,9 @@
reflect the current system time. Note that timers are based
on <c><![CDATA[erlang:now/0]]></c>. If the system time jumps, timers
then time out at the wrong time.</p>
+ <p><em>NOTE</em>: You can check whether the adjustment is enabled or
+ disabled by calling
+ <seealso marker="erlang#system_info_tolerant_timeofday">erlang:system_info(tolerant_timeofday)</seealso>.</p>
</item>
<tag><c><![CDATA[+d]]></c></tag>
<item>
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 0f4dfc0f98..9ad42374bf 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -6295,6 +6295,13 @@ ok
(<seealso marker="erts:erl_driver#driver_async">driver_async()</seealso>)
as an integer.</p>
</item>
+ <tag><marker id="system_info_tolerant_timeofday"><c>tolerant_timeofday</c></marker></tag>
+ <item>
+ <p>Returns whether compensation for sudden changes of system
+ time is <c>enabled</c> or <c>disabled</c>.</p>
+ <p>See also <seealso marker="erts:erl#+c">+c</seealso>
+ command line flag.</p>
+ </item>
<tag><c>trace_control_word</c></tag>
<item>
<p>Returns the value of the node's trace control word.
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 2adba9b240..4d5e55aaf5 100755
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -2691,6 +2691,11 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1)
else if (ERTS_IS_ATOM_STR("ets_limit",BIF_ARG_1)) {
BIF_RET(make_small(erts_db_get_max_tabs()));
}
+ else if (ERTS_IS_ATOM_STR("tolerant_timeofday",BIF_ARG_1)) {
+ BIF_RET(erts_disable_tolerant_timeofday
+ ? am_disabled
+ : am_enabled);
+ }
BIF_ERROR(BIF_P, BADARG);
}
diff --git a/erts/emulator/test/system_info_SUITE.erl b/erts/emulator/test/system_info_SUITE.erl
index ceb4afb5cf..f959714be7 100644
--- a/erts/emulator/test/system_info_SUITE.erl
+++ b/erts/emulator/test/system_info_SUITE.erl
@@ -155,6 +155,7 @@ misc_smoke_tests(Config) when is_list(Config) ->
?line true = is_binary(erlang:system_info(loaded)),
?line true = is_binary(erlang:system_info(dist)),
?line ok = try erlang:system_info({cpu_topology,erts_get_cpu_topology_error_case}), fail catch error:badarg -> ok end,
+ true = lists:member(erlang:system_info(tolerant_timeofday), [enabled, disabled]),
?line ok.
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 1508eed9ee..af43be10c6 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -2286,6 +2286,7 @@ tuple_to_list(_Tuple) ->
(system_architecture) -> string();
(threads) -> boolean();
(thread_pool_size) -> non_neg_integer();
+ (tolerant_timeofday) -> enabled | disabled;
(trace_control_word) -> non_neg_integer();
(update_cpu_info) -> changed | unchanged;
(version) -> string();