From: Sergio Durigan Junior <sergiodj@redhat.com>
To: Pedro Alves <palves@redhat.com>
Cc: Jan Kratochvil <jan.kratochvil@redhat.com>,
GDB Patches <gdb-patches@sourceware.org>
Subject: Re: [PATCH] Always print "Detaching after fork from child..."
Date: Thu, 25 Jan 2018 20:21:00 -0000 [thread overview]
Message-ID: <87lgglwuzc.fsf@redhat.com> (raw)
In-Reply-To: <93ffe8e4-ad56-01b1-c0b5-f9d9c5fb71ec@redhat.com> (Pedro Alves's message of "Thu, 25 Jan 2018 15:58:56 +0000")
On Thursday, January 25 2018, Pedro Alves wrote:
> On 01/24/2018 08:56 PM, Sergio Durigan Junior wrote:
>> On Wednesday, January 24 2018, Jan Kratochvil wrote:
>>
>>> On Wed, 24 Jan 2018 20:47:14 +0100, Sergio Durigan Junior wrote:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=235197
>>>
>>> As a justification for this patch:
>>>
>>> ------------------------------------------------------------------------------
>>> cat >fork2.c <<EOH
>>> #include <unistd.h>
>>> #include <stdio.h>
>>> static void printit(void) {
>>> puts("printed");
>>> }
>>> int main(void) {
>>> if (!fork()) printit();
>>> return 0;
>>> }
>>> EOH
>>> gcc -o fork2 fork2.c -Wall -g
>>> gdb -q ./fork2
>>> (gdb) b printit
>>> Breakpoint 1 at 0x40052b: file fork2.c, line 4.
>>> (gdb) r
>>> Starting program: /quad/home/jkratoch/t/fork2
>>> printed
>>> [Inferior 1 (process 15812) exited normally]
>>> (gdb) q
>>> ------------------------------------------------------------------------------
>>>
>>> As the GDB user does not expect the program could do any forks s/he is
>>> confused the breakpoint did not get hit and assumes GDB is just broken.
>>
>> Thanks for the extra justification and the useful example.
>>
>>> But then I cannot say this patch is too great, it produces many uninteresting
>>> Detaching after fork from child process 24905.
>>> messages rather just annoying in most cases. So nowadays I feel the message
>>> is more an excuse how to show it is user's fault s/he did not read it.
>>> But I think nobody reads them as there are too many such messages.
>>
>> I understand where you're coming from, but I still think this is a good
>> patch because I read the messages, and as I said, they even helped me in
>> one occasion.
>
> I'm of two minds here. On the one hand, "help, GDB doesn't stop at
> my breakpoint!" is a FAQ on IRC. OTOH, I also worry a bit about
> printing too many messages.
>
> Maybe the middle ground is having a way to toggle this output on/off
> other than the over-broad "set verbose". An idea would be to make it
> conditional on the existing "set print inferior-events" instead, and
> flip "set print inferior-events" on by default, like
> "set print thread-events" is on by default. One trouble with the
> "set print inferior-events" setting is that currently it prints
> redundant info, like:
>
> ~~
> [Inferior 1 (process 2629) exited normally]
> [Inferior 2629 exited]
> ~~
>
> But we can fix that, I think. See a quick straw-man patch below.
> (Really just a a straw-man; there's more redundancy if you do "follow-fork child",
> for example.)
Thanks for the reply and the patch. It is my understanding that you
would like it to be extended in order to avoid redundancy in other
cases. I will take a look at it.
--
Sergio
GPG key ID: 237A 54B1 0287 28BF 00EF 31F4 D0EB 7628 65FC 5E36
Please send encrypted e-mail if possible
http://sergiodj.net/
next prev parent reply other threads:[~2018-01-25 20:21 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-24 19:47 Sergio Durigan Junior
2018-01-24 20:43 ` Jan Kratochvil
2018-01-24 20:56 ` Sergio Durigan Junior
2018-01-25 15:59 ` Pedro Alves
2018-01-25 20:21 ` Sergio Durigan Junior [this message]
2018-01-25 22:39 ` Pedro Alves
2018-01-31 16:57 ` [PATCH v2] Enable 'set print inferior-events' and cleanup attach/detach messages Sergio Durigan Junior
2018-02-01 17:17 ` Pedro Alves
2018-03-06 1:44 ` Sergio Durigan Junior
2018-03-09 21:56 ` [PATCH v3] Enable 'set print inferior-events' and improve detach/fork/kill/exit messages Sergio Durigan Junior
2018-03-20 19:24 ` Sergio Durigan Junior
2018-03-26 10:58 ` Pedro Alves
2018-03-26 11:43 ` Pedro Alves
2018-04-03 0:15 ` Sergio Durigan Junior
2018-04-02 21:51 ` Sergio Durigan Junior
2018-04-05 18:47 ` [PATCH v4] " Sergio Durigan Junior
2018-04-05 21:32 ` Sergio Durigan Junior
2018-04-06 15:39 ` Pedro Alves
2018-04-06 15:56 ` Sergio Durigan Junior
2018-04-06 16:41 ` Pedro Alves
2018-04-10 16:22 ` Sergio Durigan Junior
2018-04-11 18:46 ` [PATCH v5] " Sergio Durigan Junior
2018-04-11 19:05 ` Pedro Alves
2018-04-11 19:08 ` Sergio Durigan Junior
2018-04-16 20:04 ` [PATCH v6] " Sergio Durigan Junior
2018-04-17 15:57 ` Pedro Alves
2018-04-17 20:07 ` Sergio Durigan Junior
2018-04-19 19:54 ` [PATCH v7] " Sergio Durigan Junior
2018-04-24 13:33 ` Pedro Alves
2018-04-24 19:49 ` Sergio Durigan Junior
2018-04-25 17:41 ` [PATCH] Fix new inferior events output (Re: [PATCH v7] Enable 'set print inferior-events' and improve detach/fork/kill/exit messages) Pedro Alves
2018-04-25 17:53 ` Sergio Durigan Junior
2018-04-25 18:07 ` Pedro Alves
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