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DIRFD(3) Linux Programmer's Manual DIRFD(3) NAME dirfd - get directory stream file descriptor SYNOPSIS #include <sys/types.h> #include <dirent.h> int dirfd(DIR *dirp); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): dirfd(): _BSD_SOURCE || _SVID_SOURCE || /* Since glibc 2.10: */ (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 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 al- ter the file position, such as fstat(2) and fchdir(2). It will be au- tomatically 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 Multithreading (see pthreads(7)) The dirfd() function is thread-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 _BSD_SOURCE or _SVID_SOURCE 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 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/. Linux 2013-07-05 DIRFD(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
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