DIRFDSection: Linux Programmer's Manual (3)
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NAMEdirfd - get directory stream file descriptor
int dirfd(DIR *dirp);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe function dirfd() returns the file descriptor associated with the directory stream dirp.
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.
RETURN VALUEOn success, a non-negative file descriptor is returned. On error, -1 is returned.
ERRORSPOSIX.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.
CONFORMING TOPOSIX.1-2008. This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.
NOTESThe prototype for dirfd() is only available if _BSD_SOURCE or _SVID_SOURCE is defined.
SEE ALSOopen(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.