avutil/file_open: avoid file handle inheritance on Windows
authorTobias Rapp <t.rapp@noa-audio.com>
Thu, 29 Oct 2015 08:11:37 +0000 (09:11 +0100)
committerMichael Niedermayer <michael@niedermayer.cc>
Thu, 12 Nov 2015 01:55:46 +0000 (02:55 +0100)
commit5ae4842122ca5b70f5499d233ff99143ac3369e4
treecdd4163e1c4f3214396d7e045bc2e48a4bfe269d
parentab6f4bc06433c57ca9b789a5853524b67301b548
avutil/file_open: avoid file handle inheritance on Windows

Avoids inheritance of file handles on Windows systems similar to the
O_CLOEXEC/FD_CLOEXEC flag on Linux.

Fixes file lock issues in Windows applications when a child process
is started with handle inheritance enabled (standard input/output
redirection) while a FFmpeg transcoding is running in the parent
process.

Links relevant to the subject:

https://msdn.microsoft.com/en-us/library/w7sa2b22.aspx

Describes the _wsopen() function and the O_NOINHERIT flag. File handles
opened by _wsopen() are inheritable by default.

https://msdn.microsoft.com/en-us/library/windows/desktop/ms682425%28v=vs.85%29.aspx

Describes handle inheritance when creating new processes. Handle
inheritance must be enabled (bInheritHandles = TRUE) e.g. when you want
to pass handles for stdin/stdout via lpStartupInfo.

Signed-off-by: Tobias Rapp <t.rapp@noa-audio.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 474665346616e446ecd1407002fdf5f88201bf72)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavutil/file_open.c