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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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TELLDIR(3) Linux Programmer's Manual TELLDIR(3)
telldir - return current location in directory stream
#include <dirent.h>
long telldir(DIR *dirp);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
telldir():
_XOPEN_SOURCE
|| /* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 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 appropriately.
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.1-2001, POSIX.1-2008, 4.3BSD.
In glibc up to version 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 release 5.10 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
https://www.kernel.org/doc/man-pages/.
2017-09-15 TELLDIR(3)
Pages that refer to this page: closedir(3), dirfd(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3)
Copyright and license for this manual page
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