@c ----------------------------------------------------------------------
@node vfork, unix
@heading @code{vfork}

@subheading Description

This function is provided to assist in porting Unix programs only.  It
always fails. 

@subheading Return Value

-1

@c ----------------------------------------------------------------------
@node vfprintf, stdio
@heading @code{vfprintf}
@subheading Syntax

@example
#include <stdio.h>
#include <stdarg.h>

int vfprintf(FILE *file, const char *format, va_list arguments);
@end example

@subheading Description

Sends formatted output from the @var{arguments} to the @var{file}. 
@xref{printf}

@subheading Return Value

The number of characters written.