Ruby

We are embedding Ruby VM into a windows app ( msvc2015 CRT ). VM fails to initialize in Init_IO with 'closed stream', when initing stdin, stdout and stderr. Debugging shows that fileno() call for stdin and stderr returns -2 value and it is not and error according to MSDN:

https://msdn.microsoft.com/en-us/en-en/library/zs6wbdhx.aspx
"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."

Applying following patch to rb_io_check_closed seems to resolve the issue:

#ifdef _WIN32  if ((fptr->fd < 0) && (fptr->fd != -2) ) { #else  if (fptr->fd < 0) { #endif rb_raise(rb_eIOError, closed_stream); }