Manpage of TELLDIR

TELLDIR

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

telldir - return current location in directory stream  

SYNOPSIS

#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  

DESCRIPTION

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

RETURN VALUE

On success, the telldir() function returns the current location in the directory stream. On error, -1 is returned, and errnois set appropriately.  

ERRORS

EBADF
Invalid directory stream descriptor dirp.
 

ATTRIBUTES

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

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, 4.3BSD.  

NOTES

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 noassumptions about its contents.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO

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Time: 22:27:45 GMT, June 20, 2016