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DIRFD(3) Linux Programmer's Manual DIRFD(3)
dirfd - get directory stream file descriptor
int dirfd(DIR *dir);
The function dirfd() returns the file descriptor associated with the
directory stream dir.
This descriptor is the one used internally by the directory stream. As
a result, it is only useful 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 error -1 is returned.
The prototype for dirfd() is only available if _BSD_SOURCE or
_SVID_SOURCE is defined.
This is a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD. It is
present in libc5 (since 5.1.2) and in glibc2. This function is under
consideration for inclusion in a future version of POSIX.1.
open(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3),
Linux 2.5 2002-01-05 DIRFD(3)
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