Section (3) telldir
telldir — return current location in directory stream
returns the current location associated with the directory
On success, the
function returns the current location in the directory
stream. On error, −1 is returned, and
errno is set appropriately.
For an explanation of the terms used in this section, see attributes(7).
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.
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Copyright 1993 David Metcalfe (davidprism.demon.co.uk)
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Linux libc source code
Lewine_zsingle_quotesz_s _POSIX Programmer_zsingle_quotesz_s Guide_ (O_zsingle_quotesz_Reilly & Associates, 1991)
386BSD man pages
Modified Sat Jul 24 17:48:42 1993 by Rik Faith (faithcs.unc.edu)