dirfd - get directory stream file descriptor
The function dirfd() returns the file descriptor associated with the directory stream
This file descriptor is the one used internally by the directory stream. As a result, it is useful only for functions which do not depend on or alter the file position, such as fstat(2) and fchdir(2). It will be automatically closed when closedir(3) is called.
On success, a nonnegative file descriptor is returned. On error, -1 is returned, and
errno is set to indicate the cause of the error.
POSIX.1-2008 specifies two errors, neither of which is returned by the current implementation.
dirp does not refer to a valid directory stream.
The implementation does not support the association of a file descriptor with a directory.
POSIX.1-2008. This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.
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