dirfd(3) Library Functions Manual dirfd(3) NAME dirfd - get directory stream file descriptor LIBRARY Standard C library (libc, -lc) SYNOPSIS #include <sys/types.h> #include <dirent.h> int dirfd(DIR *dirp); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): dirfd(): /* Since glibc 2.10: */ _POSIX_C_SOURCE >= 200809L || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE DESCRIPTION The function dirfd() returns the file descriptor associated with the directory stream dirp. This file descriptor is the one used internally by the directory stream. As a result, it is useful only for functions which do not de- pend 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, dirfd() returns a file descriptor (a nonnegative integer). On error, -1 is returned, and errno is set to indicate 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 at- tributes(7). ┌────────────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────────────────────────┼───────────────┼─────────┤ │dirfd() │ Thread safety │ MT-Safe │ └────────────────────────────────────────────┴───────────────┴─────────┘ STANDARDS POSIX.1-2008. This function was a BSD extension, present in 4.3BSD- Reno, not in 4.2BSD. SEE ALSO open(2), openat(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3) Linux man-pages 6.03 2023-02-05 dirfd(3)
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