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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
   appropriately.

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
   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.

SEE ALSO

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

COLOPHON

   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
   https://www.kernel.org/doc/man-pages/.

                              2016-03-15                        TELLDIR(3)



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