[Bug server/17760] New: gdbserver (MinGW) reports incorrect pid for a process being debugged

[Bug server/17760] New: gdbserver (MinGW) reports incorrect pid for a process being debugged

[nikolay.koldunov at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17760

            Bug ID: 17760
           Summary: gdbserver (MinGW) reports incorrect pid for a process
                    being debugged
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
          Assignee: unassigned at sourceware dot org
          Reporter: nikolay.koldunov at oracle dot com

$ gdbserver :1234
C:/Users/tester/Documents/NetBeansProjects/Arguments_1/dist/Debug/MinGW-Windows/arguments_1.exe
Process
C:/Users/tester/Documents/NetBeansProjects/Arguments_1/dist/Debug/MinGW-Windows/arguments_1.exe
created; pid = 864
Listening on port 1234
Remote debugging from host 127.0.0.1

pid = 864


$ gdb --interpreter mi
=thread-group-added,id="i1"
~"GNU gdb (GDB) 7.6.1\n"
~"Copyright (C) 2013 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 \"mingw32\".\nFor bug reporting instructions,
please see:\n"
~"<http://www.gnu.org/software/gdb/bugs/>.\n"
(gdb)
target remote :1234
&"target remote :1234\n"
~"Remote debugging using :1234\n"
=thread-group-started,id="i1",pid="42000"
=thread-created,id="1",group-id="i1"
~"0x77a60fac in ?? ()\n"
*stopped,frame={addr="0x77a60fac",func="??",args=[]},thread-id="1",stopped-threads="all"
^done
(gdb)

pid = 42000

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug server/17760] gdbserver (MinGW) reports incorrect pid for a process being debugged

[palves at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17760

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |palves at redhat dot com

--- Comment #1 from Pedro Alves <palves at redhat dot com> ---
"42000" is a magic internal PID number that GDB uses whenever it can't figure
out the target's pid.  

On GNU/Linux, GDBserver activates the multi-process extensions 
(target_supports_multi_process) and thus GDB knows the real inferior's PID.

The trouble is that gdbserver's Windows backend doesn't support multi-process,
and so gdbserver doesn't tell GDB the real PID of the process.

Maybe we could activate the extensions even if the target backend can't debug
more than one process at a time.  We'd need to make server.c refuse vRun /
vAttach if already debugging a process, on !target_supports_multi_process
targets, but it would probably works.

(tbc, not going to do it myself)

-- 
You are receiving this mail because:
You are on the CC list for the bug.