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* [Bug gdb/17694] New: Terminal isn't properly restored after the change to rl_callback functions
@ 2014-12-10 12:23 terry.guo at arm dot com
2014-12-10 12:24 ` [Bug gdb/17694] " terry.guo at arm dot com
0 siblings, 1 reply; 2+ messages in thread
From: terry.guo at arm dot com @ 2014-12-10 12:23 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17694
Bug ID: 17694
Summary: Terminal isn't properly restored after the change to
rl_callback functions
Product: gdb
Version: HEAD
Status: NEW
Severity: critical
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: terry.guo at arm dot com
Hi there,
I am working on Ubuntu 12.04 64bit and using gdb trunk for arm-none-eabi
target.
Before this change:
commit cbd6f6bf80881be4628622e369baafb337589578
Author: Pedro Alves <palves@redhat.com>
Date: Thu Oct 23 17:13:35 2014 +0100
PR python/17372 - Python hangs when displaying help()
This is more of a readline/terminal issue than a Python one.
My command "arm-none-eabi-gdb -x gdb.cmd coremark.axf" works fine and I can get
back to a normal terminal. Now with above change, after the execution of same
command, the terminal is abnormal, I can't see what I typed, but I can see the
results of typed command. Looks to me the echo feature of terminal isn't
properly restored. I have to use shell 'reset' command to reset the terminal.
However everything works fine if I source my script gdb.cmd in gdb terminal
manually.
This is an embedded project running on a small SOC board. I am sorry that I
can't provide a test case. But I compared how those gdb_rl_callback_handler_*
functions are called in above two different calling methods. Hope this can help
you to understand the issue. Please let me know if further information is
needed.
First thing: before above change, the readline rl_callback_handler* functions
are never called in my case. I just insert printf function into those functions
and never see the output. So I assume they are not called.
Now with above change, I insert three printf functions into new
gdb_rl_callback_handler_* functions. With command "arm-none-eabi-gdb -x gdb.cmd
coremark.axf", I got:
arm-none-eabi-gdb -x g.cmd coremark.axf
GNU gdb (GDB) 7.8.1.20141210-cvs
<<snip it for the sake of simplicity>>
Semihosting disabled.
Breakpoint 1 at 0xa8
Note: automatically using hardware breakpoints for read-only addresses.
Breakpoint 1, 0x000000a8 in _start ()
------I am in gdb_rl_callback_handler_reinstall function and the condition is
true
------I am in gdb_rl_callback_handler_install function
Semihosting enabled.
Breakpoint 2 at 0x6258
<<snip it for the sake of simplicity>>
Correct operation validated. See readme.txt for run and reporting rules.
Breakpoint 2, 0x00006258 in _exit ()
Program received signal SIGQUIT, Quit.
0x0000626c in _kill ()
Now the command is finished and I am in terminal, but I can't see what I typed.
But if I manually source the gdb.cmd in gdb terminal, I got:
arm-none-eabi-gdb coremark.axf
GNU gdb (GDB) 7.8.1.20141210-cvs
<<<snip it>>>
Reading symbols from coremark.axf...(no debugging symbols found)...done.
------I am in gdb_rl_callback_handler_remove function
------I am in gdb_rl_callback_handler_install function
(gdb) source g.cmd
0x0000626c in _kill ()
Semihosting disabled.
Breakpoint 1 at 0xa8
Note: automatically using hardware breakpoints for read-only addresses.
Breakpoint 1, 0x000000a8 in _start ()
Semihosting enabled.
Breakpoint 2 at 0x6258
<<snip it>>
Breakpoint 2, 0x00006258 in _exit ()
Program received signal SIGQUIT, Quit.
0x0000626c in _kill ()
Now the command is finished and I am in terminal. Everything is fine.
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* [Bug gdb/17694] Terminal isn't properly restored after the change to rl_callback functions
2014-12-10 12:23 [Bug gdb/17694] New: Terminal isn't properly restored after the change to rl_callback functions terry.guo at arm dot com
@ 2014-12-10 12:24 ` terry.guo at arm dot com
0 siblings, 0 replies; 2+ messages in thread
From: terry.guo at arm dot com @ 2014-12-10 12:24 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=17694
Terry Guo <terry.guo at arm dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |palves at redhat dot com
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2014-12-10 12:23 [Bug gdb/17694] New: Terminal isn't properly restored after the change to rl_callback functions terry.guo at arm dot com
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