Author eryksun
Recipients amaury.forgeotdarc, casevh, davidsarah, eryksun, neologix, pitrou, python-dev, santoso.wijaya, terry.reedy, vstinner
Date 2014-08-03.03:36:04
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Message-id <1407036965.07.0.90624245079.issue11395@psf.upfronthosting.co.za>
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Content
The buffer size only needs to be capped if WINVER < 0x602. This issue doesn't apply to Windows 8 since it uses the ConDrv device driver instead of LPC. 

Prior to Windows 8, WriteFile redirects to WriteConsoleA when passed a console handle. This makes an LPC call to conhost.exe (csrss.exe before Windows 7), which copies the buffer to a shared heap. But a Windows 8 console process instead has actual File handles provided by the ConDrv device:

    stdin     \Device\ConDrv\Input
    stdout    \Device\ConDrv\Output
    stderr    \Device\ConDrv\Output

For File handles, ReadFile and WriteFile simply call the NT system functions NtReadFile and NtWriteFile. The buffer size is only limited by available memory.
History
Date User Action Args
2014-08-03 03:36:05eryksunsetrecipients: + eryksun, terry.reedy, amaury.forgeotdarc, pitrou, vstinner, casevh, davidsarah, neologix, santoso.wijaya, python-dev
2014-08-03 03:36:05eryksunsetmessageid: <1407036965.07.0.90624245079.issue11395@psf.upfronthosting.co.za>
2014-08-03 03:36:05eryksunlinkissue11395 messages
2014-08-03 03:36:04eryksuncreate