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telldir(3) — Linux manual page

telldir(3)               Library Functions Manualtelldir(3)

NAME        top

       telldir - return current location in directory stream

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <dirent.h>long telldir(DIR *dirp);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):telldir():           _XOPEN_SOURCE              || /* glibc >= 2.19: */ _DEFAULT_SOURCE              || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION        top

       Thetelldir() function returns the current location associated       with the directory streamdirp.

RETURN VALUE        top

       On success, thetelldir() function returns the current location in       the directory stream.  On error, -1 is returned, anderrno is set       to indicate the error.

ERRORS        top

EBADFInvalid directory stream descriptordirp.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │telldir()                            │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001, 4.3BSD.       Up to glibc 2.1.1, the return type oftelldir() wasoff_t.       POSIX.1-2001 specifieslong, and this is the type used since glibc       2.1.2.       In early filesystems, the value returned bytelldir() was a simple       file offset within a directory.  Modern filesystems use tree or       hash structures, rather than flat tables, to represent       directories.  On such filesystems, the value returned bytelldir()       (and used internally byreaddir(3)) is a "cookie" that is used by       the implementation to derive a position within a directory.       Application programs should treat this strictly as an opaque       value, makingno assumptions about its contents.

SEE ALSO        top

closedir(3),opendir(3),readdir(3),rewinddir(3),scandir(3),seekdir(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17telldir(3)

Pages that refer to this page:closedir(3), dirfd(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3)

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