TELLDIR(3)		   Linux Programmer's Manual		    TELLDIR(3)



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 errno is set appropri-
       ately.

ERRORS
       EBADF  Invalid directory stream descriptor dirp.

ATTRIBUTES
       For  an	explanation  of	 the  terms  used   in	 this	section,   see
       attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |telldir() | Thread safety | MT-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	struc-
       tures,  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.

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

COLOPHON
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       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/.



				  2016-03-15			    TELLDIR(3)