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X-HELO:	atfriesa01.ssi-schaefer.com
Subject:	Re: [ANNOUNCEMENT] TEST: Cygwin 3.0.0-0.7
To:	cygwin AT cygwin DOT com
References:	<20190207182735 DOT GG13951 AT calimero DOT vinschen DOT de> <8a2f041f-f8f7-6e17-5d97-5a168440009b AT ssi-schaefer DOT com> <20190208113158 DOT GH13951 AT calimero DOT vinschen DOT de> <17e339bb-2115-bf22-7291-04215aab3150 AT ssi-schaefer DOT com> <20190208122126 DOT GM13951 AT calimero DOT vinschen DOT de> <20190208122338 DOT GN13951 AT calimero DOT vinschen DOT de> <b07e6ba2-0ce0-4662-7a02-bda6ce3b0108 AT ssi-schaefer DOT com> <20190208130635 DOT GO13951 AT calimero DOT vinschen DOT de> <20190208132807 DOT GP13951 AT calimero DOT vinschen DOT de> <6b182191-b235-fcbb-5b25-66243950043c AT ssi-schaefer DOT com> <20190208144827 DOT GR13951 AT calimero DOT vinschen DOT de>
From:	Michael Haubenwallner <michael DOT haubenwallner AT ssi-schaefer DOT com>
Message-ID:	<00970ac8-48e6-9776-e396-5ab78e55e61b@ssi-schaefer.com>
Date:	Fri, 8 Feb 2019 17:17:53 +0100
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In-Reply-To:	<20190208144827.GR13951@calimero.vinschen.de>

On 2/8/19 3:48 PM, Corinna Vinschen wrote:
> On Feb  8 15:43, Michael Haubenwallner wrote:
>> On 2/8/19 2:28 PM, Corinna Vinschen wrote:
>>> On Feb  8 14:06, Corinna Vinschen wrote:
>>>> On Feb  8 13:52, Michael Haubenwallner wrote:
>>>>> On 2/8/19 1:23 PM, Corinna Vinschen wrote:
>>>>>> On Feb  8 13:21, Corinna Vinschen wrote:
>>>>>>> On Feb  8 12:51, Michael Haubenwallner wrote:
>>>>>>>>
>>>>>>>> For now it seems like there's an inconsistency with PIDs:
>>>>>>>> A first process PID 100, receives PID 101 from spawn(),
>>>>>>>> but in the new process getpid() returns 102:
>>>>>>>>
>>>>>>>> $ ./dospawn /bin/bash -c 'echo $$'
>>>>>>>> 12625
>>>>>>>> waitpid: pid 12624 status 0x0
>>>>>>>
>>>>>>> Oh, hmm.  If you call spawnve, rather than execve, a new child pid
>>>>>>> is generated in spawnve, rather than just keeping the callers pid.
>>>>>>>
>>>>>>> However, apparently the child invents its own pid in pinfo::thisproc
>>>>>>> after being spawned.  But actually this should only occur for forked
>>>>>>> processes aore processes started from non-Cygwin parents.
>>>>>>
>>>>>> Does that help, by any chance:
>>>>>> [nope]
>>>>>
>>>>> How should the child be informed at all about the new cygpid value generated in
>>>>> parent's child_info_spawn::worker() ?
>>>>
>>>> I just realized this myself.  The old method creating Cygwin pids just
>>>> fetched the pid from GetCurrentProcessId(), which was right for spawned
>>>> (but not execed) processes.  For the new pid we might have to give this
>>>> to the child via child_info_spawn.
>>>
>>> This works for me, can you test this, too, please?
>>
>> Looks good to me as well, I'm going to start my hours running use case now.
> 
> Sounds good, thanks.  I'll push this change now.  We can always
> rework it if it's insufficient.

*** WARNING WARNING WARNING WARNING WARNING ***
*** .../newlib-cygwin/winsup/cygwin/child_info.h: magic number for CHILD_INFO_MAGIC changed old 0x3ee00652U != new 0xf4531879U
*** WARNING WARNING WARNING WARNING WARNING ***

Seems like the CHILD_INFO_MAGIC bump is missing for this change, no?

/haubi/

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