telldir - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEtelldir − return current location in directory stream

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#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

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DESCRIPTIONThe telldir() function returns the current location associated with the directory stream dirp.

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RETURN VALUEOn 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.

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ERRORSEBADF  Invalid directory stream descriptor dirp.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue telldir() Thread safetyMT-Safe

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STANDARDSPOSIX.1-2001, POSIX.1-2008, 4.3BSD.

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NOTESUp 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.

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SEE ALSOclosedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3) 0

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