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This patch fixes an issue where io:columns/0 times out when invoked from
any application callback (or any supervisor/supervised module since the
group leader is inherited).
To reproduce the issue, one must simply call io:columns() from any
application callback. You will notice the process will block for 2 seconds
which then times out and returns {:error, :enotsup}.
Note this bug only happens inside the erlang shell (using -noshell or
escripts do not trigger the bug).
To fix the bug, it is important to understand how io requests flow from
application callback processes. Here are the steps followed:
1. Since io:columns/1 is timing out, the first step is to find out who is the
group leader for the application callback process. Using process_info/1, we
can see the parent process is the application_master and handles
io_requests by delegating them to the group_leader.
2. By inspecting the application_master process, we can find the group_leader
the message is sent is the registered process named user. The process is
running the group module which does handle io:columns/1 requests delegating
them to user_drv process.
3. The user_drv process does handle tty_geometry requests, except that a
clause above ends up short-circuiting all tty_geometry requests from the
user process.
This patch moves the user clause below the specific driver messages.
OTP-12241
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Added a put_chars_sync to the protocol that can be used to
talk to user_drv and made group use it. This is needed in order
to guarantee that bytes has been pushed to the tty port when
doing something like this:
io:format("halting\n"),erlang:halt(0).
Before this change the halting message could be lost in the message
queue of the user_drv process, this is no longer possible.
This commit also fixes ssh_cli as that plugs itself in as a user_drv
process.
OTP-12240
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* sverk/crypto-ec-mem-leak/OTP-11999:
crypto: Fix memory leak of EC "keys" and "points"
crypto: Fix crypto for debug and valgrind
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* egil/fix-doc-links:
doc: Fix broken links in Installation Guide
doc: Fix broken links
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* siri/cuddle-with-tests:
[reltool] Back out adaption to better quoting on windows
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This commit only changes the test. It reverts commit 710a1fa
([reltool] Adapt tests to better quoting of paths on windows) because
the commit that actually changed the quoting behaviour on windows was
moved from the maint branch to master (9633e0e win32: Fix quoting of
paths).
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* ia/inets/prep-for-release:
inets: Prepare for release
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without relying on opt-version has been built.
Removed ASSERT to make crypto_callback.debug.so work without
dynamic linking to libcrypto.so.
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This ticket is about records in Erlang code, and when to check the
fields against the (optional) types given when defining records.
Dialyzer operates on the Erlang Core format, where there are no trace
of records. The fix implemented is a Real Hack:
Given the new option 'dialyzer' erl_expand_records marks the line
number of records in a way that is undone by v3_core, which in turn
inserts annotations that can be recognized by Dialyzer.
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* ia/ssl/revert-due-to-performance-issue:
Revert "ssl: Avoid creating a huge session table"
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* bjorn/compiler/fix-latin1-fallback/OTP-11987:
Fix handling of latin1 characters in false ifdef branches
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* bjorn/kernel/remove-file_info-vestiges/OTP-11982:
Remove documentation and stub for non-exist file:file_info/1
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* siri/ct-and-cover/OTP-11971:
[test_server] Fix bug introduced in 5a3c466
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This reverts commit fcc6a756277c8f041aae1b2aa431e43f9285c368.
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This was detected by dialyzer - an '=' character too much had
erronously been inserted.
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* siri/reltool-typo/OTP-11977:
Fix typo in error message in reltool_server
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* peppe/common_test/ct_basic_html_error:
Fix problem with mismatching html tags when running basic_html log mode
OTP-11917
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* peppe/common_test/ct_log_cache_error:
Force CT log cache to rescan entries with incomplete results
OTP-11988
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The fallback to latin-1 encoding would not work if the invalid
UTF-8 characters occurred in a skipped branch in an -ifdef/-ifndef.
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* dgud/wx/additional-functionality/OTP-11986:
wx: Fix destroy bug
wx: Add wxPopup(Transient)Window
wx: Fix non constant define (wxSL_LABELS)
wx: Add wxActivateEvent
wx: Add missing wxTextCtrl:changeValue
OTP-11985
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Do not postpone deletion of wx*DC objects since they need to be
deleted directly. Otherwise, if inside showModal, causes an eternal
loop of wxPaint events on Windows.
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* bjorn/asn1/dialyzer-warnings/OTP-11372: (23 commits)
BER: Eliminate dialyzer warnings for specialized decode functions
BER: Eliminate dialyzer warning for encoding of BIT STRINGs
BER: Optimize encoding of ENUMERATED
BER: Remove a redundant clause in encoding of open types
(U)PER: Fix decoding of named INTEGER
(U)PER: Fix encoding of a semi-constrained, named INTEGER
(U)PER: Optimize handling of named BIT STRING with a lower zero bound
PER: Optimize encoding of character strings with simple ranges
PER: Remove unnecessary clause for handling DEFAULT
(U)PER: Suppress dialyzer warnings for complete/1
Test suites: Add support for running Dialyzer on generated code
Improve tests of DEFAULT values
Correct OCTET STRING default when legacy_erlang_types is active
Remove old DEFAULT-checking code made obsolete in the previous commit
Rewrite the code for testing DEFAULT for DER
Test DEFAULT more thoroughly
Set.py: Correct illegal DEFAULT value
BER: Optimize decoding of ENUMERATED
BER: Suppress dialyzer warnings for encode_bit_string/4
BER: Inline testing of constraints when decoding
...
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SSH_MSG_IGNORE
SSH_MSG_UNIMPLEMENTED
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* gorillainduction/improve_mnesia_locker_complexity:
Optimize tid lock table
OTP-11981
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* ia/ssl/test-cuddle:
ssl: Test case stability
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* ia/ssl/dialyzer-specs:
ssl: Fix dialyzer specs to reflect reality
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file:file_info/1 was removed a long time ago, but its
documentation was not removed.
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* bjorn/kernel/stick-preloaded/OTP-11913:
Allow unsticking pre-loaded modules
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Commit ed06dd12ea74018b902a2c4c7924313d23cedb75 made pre-loaded
modules (such as erlang) sticky, and also made it impossible to
unstick them to prevent them from ever be reloaded.
It turns out that there are tools that may want to instrument
the erlang module (such as concuerror), so making it
impossible to unstick modules is harsh. Therefore, revert the
part of the commit that prevented unsticking the pre-loaded
modules.
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* ia/ssh/inet-option/OTP-11976:
ssh: Handle inet and inet6 option correctly
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* ia/ssl/CSS/OTP-11975:
ssl: Make sure change cipher spec is correctly handled
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* siri/ct-and-cover/OTP-11971:
Improve cover analysis via common_test
Change internal format of CoverInfo in test_server
[ct] Add test of cover support when merge_tests=false
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* ia/ssl/version-argument:
ssl: Version argument to ssl_cipher:anonymous_suites should not be added yet!
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* erlang/pr/383:
Fix small copy&paste mistakes in doc of alternative process registry
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