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This allows us to enable/disable lock counting at will, and greatly improves
the performance of erts_debug:lock_counters/1 since we no longer have to
worry about the lock counters "dying" while we're enumerating them.
OTP-14412
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Call get_stacktrace/0 in a safer way
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Remove duplicate aes_gcm from a list of ciphers
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* ferd/kernel/shell-history-storage/OTP-14409:
Add persistence to history of the non-legacy shell
add option 'quiet' to disk_log
Fix type declaration for disk_log.hrl
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because there is a bug in the client verification code for those algorithms
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Conflicts:
lib/ssh/src/ssh_transport.erl
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Conflicts:
lib/ssh/src/ssh_transport.erl
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* dgud/observer/chunk-proc-info:
observer: Fix alpabetic ordering when sorting on Name
observer: Handle crash when node goes down
observer: listen on correct notebook change
observer: chunk process list info
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* dgud/wx/fix-msvc-2015:
wx: Fix builds on VS-2017
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This patch adds a mechanism by which shell history gets stored
persistently on disk and gets loaded whenever a new shell session
begins.
The log files are added to the user's cache directory, with multiple
files in it, although the location is configurable.
All Erlang instances on a given host will share the same log file.
There are two hook points in group.erl that are used: when instantiating
the buffer, where we fetch from disk, and when adding a line to the
buffer (gets stored).
This allows all shell instances to use the same base set of lines when
loaded, but to keep their history separate after the fact. As lines are
added as you go, a new shell session (with ^G -> s -> c) will have
access to previous sessions' lines.
The implementation makes use of the disk_log library with a rotating log
in order to store data, and allow automated repairs.
By default, the feature is disabled and must be turned on through OTP
environment variable part of the kernel application. The options
include:
| Option | Accepted values | Default | Description |
| ------------------------ | ----------------- |---------- | -------------------- |
| shell_history | enabled, disabled | disabled | turn feature on/off |
| shell_history_path | any string | user cache| where to put files |
| shell_history_file_bytes | 51200..N bytes | 512kb | max data size (>50kb)|
| shell_history_drop | ["q().", ...] | [] | blacklisted lines |
A version header is added to the disk_log configuration, allowing
changes in the storage format to be enacted in the future (i.e. adding
segmentation by node name in the same file, or encoding) without
conflict.
Log rotation is used with multiple log files to ensure proper
enforcement of resizing without too much data loss. Because disk_log
does not allow to just flush bits of content on rewrite (it truncates
any full file), we instead use a wrap log and try to divide the
configured size into up to 10 log files so that every time we rotate a
log, we lose only 10% of the data. This remains true for corrupted files
that cannot fully be repaired.
This many-logs-based approach in turn forces the use of a minimal log
size for the `shell_history_file_bytes` configuration, since it has to
be divided by 10.
The shell history is not loaded for the `user` process which, despite
running the group.erl module, does not actually require history as it
mostly just forwards IO protocol information.
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This option allows to suppress output of info_msgs to error_logger when
recoverable errors are encountered in disk_log by setting the value to
'true'.
Defaults to 'false', the backwards compatible behaviour.
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A specific type was given as an atom rather than an actual type
defintion.
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proc_lib calls erlang:get_stacktrace/0 twice, which is unnecessary,
and potentially unsafe since there are calls to many functions
in between. Any of the calls could potentially cause and catch
an exception, invalidating the stacktrace.
Only call erlang:get_stacktrace/0 once, and pass the result to
the second place where it is needed.
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It happens to work today, but it is potentially unsafe to call
io:format/2 before calling erlang:get_stacktrace/0. Make the
code safe by calling erlang:get_stacktrace/0 directly after
catching the exception.
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Fix a few minor issues in the lcnt documentation
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Simplify building a lock-counting emulator
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We generally avoid abbreviations such as "e.g." and "i.e." in
the documentation. We write "Erlang", not "erlang" (except when
referring to the erlang module).
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* ingela/dtls/opts:
ssl: Adopt setopts and getopts for DTLS
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Revise minor notation in httpc:request/[4,5]
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* ingela/remove-debug:
ssl: Remove debug printout
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* ingela/dtls/replay-protect/OTP-14077:
dtls: Implement replay protection
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See RFC 6347 section 3.3
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Warn for potentially unsafe use of get_stacktrace/0
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Add option hibernate_after to gen_server, gen_statem and gen_event.
Also added to the deprecated gen_fsm behaviour.
OTP14405
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Add unicode binary support to http_uri functions
OTP-14404
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* ingela/ssl/bench-certs:
ssl: Disable Server Name verification in bench tests for now
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