On recent windows fileno return -2 in case of closed stdin, stdout, stderr

[Bastien ROUCARIES]

Hi,

according to 
https://docs.microsoft.com/fr-fr/cpp/c-runtime-library/reference/fileno?view=vs-2019

If stdout or stderr is not associated with an output stream (for
example, in a Windows application without a console window), the file
descriptor returned is -2. In previous versions, the file descriptor
returned was -1. This change allows applications to distinguish this
condition from an error.

This should be mentionned in the doc:
A work arround is to create a console at the beginning of the program
and close the window.

if(AllocConsole())
{
    freopen ("CONOUT$", "w", stdout);
    freopen ("CONOUT$", "w", stderr);
    ShowWindow (FindWindowA ("ConsoleWindowClass", NULL), false);
}

See also https://github.com/rprichard/win32-console-docs for list of
bug due to closing console handle.

Bastien