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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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telldir(3) Library Functions Manual telldir(3)
telldir - return current location in directory stream
Standard C library (libc, -lc)
#include <dirent.h>
long telldir(DIR *dirp);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
telldir():
_XOPEN_SOURCE
|| /* glibc >= 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
The telldir() function returns the current location associated
with the directory stream dirp.
On success, the telldir() function returns the current location in
the directory stream. On error, -1 is returned, and errno is set
to indicate the error.
EBADF Invalid directory stream descriptor dirp.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ telldir() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
POSIX.1-2001, 4.3BSD.
Up to glibc 2.1.1, the return type of telldir() was off_t.
POSIX.1-2001 specifies long, and this is the type used since glibc
2.1.2.
In early filesystems, the value returned by telldir() 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 by telldir()
(and used internally by readdir(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, making no assumptions about its contents.
closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3),
seekdir(3)
This page is part of the man-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 is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 telldir(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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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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