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)):

       || /* 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


   EBADF  Invalid directory stream descriptor dirp.


   For  an  explanation  of  the  terms  used   in   this   section,   see

   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

   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),


   This page is part of release 4.09 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

                              2016-03-15                        TELLDIR(3)


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