Message 269645 - Python tracker

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Author	eryksun
Recipients	abarry, eryksun, paul.moore, steve.dower, tim.golden, vstinner, zach.ware
Date	2016-07-01.05:24:36
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1467350676.76.0.948801134496.issue27423@psf.upfronthosting.co.za>
In-reply-to

Content
test_os intentionally operates on invalid file descriptors. In the Windows CRT this leads to failed assertions, such as from its _VALIDATE_RETURN macro. This macro would also call the default invalid parameter handler, which would kill the process, but that's disabled in 3.5+ via _Py_BEGIN_SUPPRESS_IPH. That leaves the message box for failed assertions in debug builds [1]. On entry, support.SuppressCrashReport calls the CRT functions _CrtSetReportMode [2] and _CrtSetReportFile [3] to ensure that failed assertions are instead printed to stderr. These functions are available in a debug build of the msvcrt module. [1]: https://msdn.microsoft.com/en-us/library/9sb57dw4.aspx [2]: https://msdn.microsoft.com/en-us/library/1y71x448.aspx [3]: https://msdn.microsoft.com/en-us/library/a68f826y.aspx

test_os intentionally operates on invalid file descriptors. In the Windows CRT this leads to failed assertions, such as from its _VALIDATE_RETURN macro. This macro would also call the default invalid parameter handler, which would kill the process, but that's disabled in 3.5+ via _Py_BEGIN_SUPPRESS_IPH. That leaves the message box for failed assertions in debug builds [1]. On entry, support.SuppressCrashReport calls the CRT functions _CrtSetReportMode [2] and _CrtSetReportFile [3] to ensure that failed assertions are instead printed to stderr. These functions are available in a debug build of the msvcrt module.

[1]: https://msdn.microsoft.com/en-us/library/9sb57dw4.aspx
[2]: https://msdn.microsoft.com/en-us/library/1y71x448.aspx
[3]: https://msdn.microsoft.com/en-us/library/a68f826y.aspx

History
Date	User	Action	Args
2016-07-01 05:24:36	eryksun	set	recipients: + eryksun, paul.moore, vstinner, tim.golden, zach.ware, steve.dower, abarry
2016-07-01 05:24:36	eryksun	set	messageid: <1467350676.76.0.948801134496.issue27423@psf.upfronthosting.co.za>
2016-07-01 05:24:36	eryksun	link	issue27423 messages
2016-07-01 05:24:36	eryksun	create