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into maint-20
* john/erts/fix-heart-command-overflow/OTP-15034/ERIERL-166:
heart: Use ntohs instead of manual conversion
# Conflicts:
# lib/kernel/test/heart_SUITE.erl
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Multiplying a signed char by 256 is undefined behavior and caused
problems on some platforms when the length was long enough. We
could cast it to an unsigned int to make it work, but it's best not
to reinvent the wheel.
Fixes OTP-15034
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Hardware watchdog support was removed from heart in R13A, but there were
still some vestiges in the code and the documentation.
- Remove mentions of the HW_WD_DISABLE variable, as it's no longer used.
- Remove the HEART_BEAT_BOOT_DELAY variable, as it was only used for the
hardware watchdog.
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* dotsimon/erts/heart_no_kill/OTP-13650:
erts: Fix HEART_NO_KILL logic
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* dotsimon/erts/heart_no_kill/OTP-13650:
erts: make HEART_NO_KILL have to be set to TRUE
Don't kill old erlang if HEART_NO_KILL is set
Conflicts:
lib/kernel/doc/src/heart.xml
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If the environment variable HEART_NO_KILL is set then
heart won't kill the old erlang process. This is desirable
if the command executed by heart takes care of this.
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The "if" referred to in the comment was removed in commit 70c9312c4b.
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By using environment variable HEART_KILL_SIGNAL, heart can now use
a different signal to kill the old running Erlang.
By default the signal is SIGKILL but SIGABRT may also be used by
setting environment variable: HEART_KILL_SIGNAL=SIGABRT
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The old time API is based on erlang:now/0. The major issue with
erlang:now/0 is that it was intended to be used for so many
unrelated things. This tied these unrelated operations together
and unnecessarily caused performance, scalability as well as
accuracy, and precision issues for operations that do not need
to have such issues. The new API spreads different functionality
over multiple functions in order to improve on this.
The new API consists of a number of new BIFs:
- erlang:convert_time_unit/3
- erlang:monotonic_time/0
- erlang:monotonic_time/1
- erlang:system_time/0
- erlang:system_time/1
- erlang:time_offset/0
- erlang:time_offset/1
- erlang:timestamp/0
- erlang:unique_integer/0
- erlang:unique_integer/1
- os:system_time/0
- os:system_time/1
and a number of extensions of existing BIFs:
- erlang:monitor(time_offset, clock_service)
- erlang:system_flag(time_offset, finalize)
- erlang:system_info(os_monotonic_time_source)
- erlang:system_info(time_offset)
- erlang:system_info(time_warp_mode)
- erlang:system_info(time_correction)
- erlang:system_info(start_time)
See the "Time and Time Correction in Erlang" chapter of the
ERTS User's Guide for more information.
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Fix erlc, escript, dialyzer, typer, ct_run, heart
and epmd should all be using widestrings on windows
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Conflicts:
erts/etc/common/heart.c
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Not setting ERL_CRASH_DUMP_SECONDS will now terminate beam
immediately on a crash without writing a crash dump file.
Setting ERL_CRASH_DUMP_SECONDS to 0 will also terminate beam
immediately on a crash without writing a crash dump file, i.e. same as not
setting ERL_CRASH_DUMP_SECONDS environment variable.
Setting ERL_CRASH_DUMP_SECONDS to a negative value will let the beam wait
indefinitely on the crash dump file being written.
Setting ERL_CRASH_DUMP_SECONDS to a positive value will let the beam wait
that many seconds on the crash dump file being written.
A positive value will set both an alarm in beam AND a heart timeout for restart
if heart is running.
This is due to the change of 'heart' behavior when 'heart' is
listening for a crash.
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When a crash dump is about to be written and we have
heartbeat enabled on a system. We need time to write it
before heart explicitly kills the beam.
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Conflicts:
erts/etc/common/heart.c
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* pan/heart_and_times/OTP-10111:
Make heart use clock_gettime when available
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heart:get_cmd/0 is documented to return an empty string if the command is
cleared. get_cmd/0 returns 2 extra bytes: 1 byte for the trailing null,
1 byte from the op (the op is an unsigned char and 2 bytes are allocated
for it in the returned buffer).
1> heart:get_cmd().
{ok,[0,0]}
2> heart:set_cmd("echo hello").
ok
3> heart:get_cmd().
{ok,[101,99,104,111,32,104,101,108,108,111,0,0]}
4> heart:clear_cmd().
ok
5> heart:get_cmd().
{ok,[0,99]}
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