[Lazarus] Can Lazarus IDE debugger attach to already running process?

[patspiper]

On 18/09/13 21:14, patspiper wrote:
> On 18/09/13 21:01, Martin wrote:
>> On 18/09/2013 19:00, patspiper wrote:
>>>
>>> I tried to attach to an external process (Ubuntu 11.04) and (Ooops) 
>>> the debugger entered the error state; Attach failed. This happens 
>>> whether the process is a Lazarus compiled app or other.
>>>
>>> Lazarus 1.3 r42849 FPC 2.6.3 i386-linux-gtk 2
>>>
>>> I am not sure if Graeme has the same symptoms or not.
>> Can you sent me a log:
>> http://wiki.lazarus.freepascal.org/GDB_Debugger_Tips#gdb.exe_has_stopped_working 
>>
> Log:
>
> =thread-group-added,id="i1"
> (gdb)
> <-gdb-set confirm off>
> ^done
> (gdb)
> <-gdb-set new-console off>
> ^error,msg="No symbol table is loaded.  Use the \"file\" command."
> (gdb)
> <set width 50000>
> &"set width 50000\n"
> ^done
> (gdb)
> <-gdb-version>
> ~"GNU gdb (Ubuntu/Linaro 7.2-1ubuntu11) 7.2\n"
> ~"Copyright (C) 2010 Free Software Foundation, Inc.\n"
> ~"License GPLv3+: GNU GPL version 3 or later 
> <http://gnu.org/licenses/gpl.html>\nThis is free software: you are 
> free to change and redistribute it.\nThere is NO WARRANTY, to the 
> extent permitted by law.  Type \"show copying\"\nand \"show warranty\" 
> for details.\n"
> ~"This GDB was configured as \"i686-linux-gnu\".\nFor bug reporting 
> instructions, please see:\n"
> ~"<http://www.gnu.org/software/gdb/bugs/>.\n"
> ^done
> (gdb)
> <-file-exec-and-symbols "/home/deleteme/project1">
> ^done
> (gdb)
> <-file-exec-and-symbols >
> ^done
> (gdb)
> <-gdb-set language pascal>
> ^done
> (gdb)
> <attach 9149>
> &"attach 9149\n"
> &"Could not attach to process.  If your uid matches the uid of the 
> target\nprocess, check the setting of 
> /proc/sys/kernel/yama/ptrace_scope, or try\nagain as the root user. 
> For more details, see /etc/sysctl.d/10-ptrace.conf\n"
> &"ptrace: Operation not permitted.\n"
> ^error,msg="ptrace: Operation not permitted."
> (gdb)
> <detach>
> &"detach\n"
> &"The program is not being run.\n"
> ^error,msg="The program is not being run."
> (gdb)
> <kill>

In 10-ptrace.conf: kernel.yama.ptrace_scope = 1

"A scope of "1" limits # PTRACE only to direct child processes (e.g. 
"gdb name-of-program" and # "strace -f name-of-program" work, but gdb's 
"attach" and "strace -fp $PID" # do not)"
which essentially explains why the debugger fails to attach to the process.

Stephano