O_BINARY

[Robert]

Pelles C .chm documentation states

_setmode function
Declared in:

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<io.h>
however, the definitions for the _setmode function "mode" parameter arguments

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_O_BINARYetc.,

are not in

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<io.h>but, instead, are located in

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<fcntl.h>
The <io.h> header should

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#include <fcntl.h>

[TimoVJL]

https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/setmode?view=msvc-170
Non standard function, for msvc, so follows ms specs ?