@node _close, file system
@subheading Syntax

@example
#include <io.h>

int _close(int fd);
@end example

@subheading Description

This is a direct connection to the MS-DOS close function call, int
0x21, %ah = 0x3e. This function can be hooked by the
@xref{File System Extensions}. If you don't want this, you should
use @xref{_dos_close}.

@subheading Return Value

Zero if the file was closed, else nonzero. 

@subheading Portability

@portability !ansi, !posix