@node _fmode, stdio
@subheading Syntax

@example
#include <fcntl.h>

extern int _fmode;
@end example

@subheading Description

This variable may be set to @code{O_TEXT} or @code{O_BINARY} to specify
the mode that newly opened files should be opened in if the open call
did not specify.  @xref{open}. @xref{fopen}.

The default value is @code{O_TEXT}.

@subheading Portability

@portability !ansi, !posix

@subheading Example

@example
_fmode = O_BINARY;
@end example