@node _dos_unlock, dos
@subheading Syntax

@example
#include <io.h>

_dos_unlock(int _fd, long _offset, long _length)
@end example

@subheading Description

Removes an advisory lock to the specified region of the file.

@subheading Return Value

Zero if the lock was removed, nonzero otherwise.

@subheading Portability

@portability !ansi, !posix