diff options
author | José Valim <[email protected]> | 2014-05-01 17:44:18 +0200 |
---|---|---|
committer | Lukas Larsson <[email protected]> | 2014-10-16 17:56:17 +0200 |
commit | 2d3a39b5729a295d4e0ac416ff0280e3edca44c6 (patch) | |
tree | 4d3af1051e0b8993bf1e629a628705dc94e0300a /bootstrap/lib/stdlib/ebin/sys.beam | |
parent | 48083e54b502afb2768066394074d29423162dc8 (diff) | |
download | otp-2d3a39b5729a295d4e0ac416ff0280e3edca44c6.tar.gz otp-2d3a39b5729a295d4e0ac416ff0280e3edca44c6.tar.bz2 otp-2d3a39b5729a295d4e0ac416ff0280e3edca44c6.zip |
Fix io:columns/0 timeout when invoked via user
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
Diffstat (limited to 'bootstrap/lib/stdlib/ebin/sys.beam')
0 files changed, 0 insertions, 0 deletions