NAME
dirfd - get directory stream file descriptor SYNOPSIS
#include
#include
int dirfd(DIR *dirp); Feature Test Macro Requirements for glibc (see featuretestmacros(7)): dirfd(): BSDSOURCE || SVIDSOURCE || /* Since glibc 2.10: */ (POSIXCSOURCE >= 200809L || XOPENSOURCE >= 700) DESCRIPTION The 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 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. RETURN VALUE On success, a nonnegative file descriptor is returned. On error, -1 is returned, and errno is set to indicate the cause of the error. ERRORS
POSIX.1-2008 specifies two errors, neither of which is returned by the current implementation. EINVAL dirp does not refer to a valid directory stream. ENOTSUP The implementation does not support the association of a file descriptor with a directory. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────┼───────────────┼─────────┤
│dirfd() │ Thread safety │ MT-Safe │ └──────────┴───────────────┴─────────┘ CONFORMING TO
POSIX.1-2008. This function was a BSD extension, present in 4.3BSD- Reno, not in 4.2BSD. NOTES The prototype for dirfd() is available only if BSDSOURCE or SVIDSOURCE is defined. SEE ALSO open(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3) COLOPHON
This page is part of release 3.53 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/.
Linux 2013-07-05 DIRFD(3)