Re: [rfc] Fix PR 18208: update /proc/pid/coredump_filter by c code

[Yao Qi <qiyaoltc@gmail.com>]

Luis Machado <lgustavo@codesourcery.com> writes:

>>> -# Get the inferior's PID.
>>> -set infpid ""
>>>   gdb_test_multiple "info inferiors" "getting inferior pid" {
>>> -    -re "process \($decimal\).*\r\n$gdb_prompt $" {
>>> -	set infpid $expect_out(1,string)
>>> +    -re "process $decimal.*\r\n$gdb_prompt $" {
>>>       }
>>>       -re "Remote target.*$gdb_prompt $" {
>>>   	# If the target does not provide PID information (like usermode QEMU),
>>
>> This "If the target does not provide PID information" check sounds
>> odd now.  Do we still need it?
>
> If we're not dealing with PID's, i don't think so.

At the very start, I removed this block, but I recall that this block is
used as a guard for usermode QEMU which doesn't provide PID
information.  With this patch applied, we'll access
/proc/self/coredump_filter, but I am afraid it doesn't work as expected
on usermode QEMU, because usermode QEMU just intercepts few /proc
accesses and pass most of them through the host linux.  Accessing
/proc/QEMU_PID/coredump_filter isn't what we want in this test, so I
think it's better to skip the test for usermode QEMU.

Of course, I don't mind removing this block.  Luis, could you try this
patch and remove this block, see whether it causes fails on usermode QEMU?

-- 
Yao (齐尧)