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long telldir(DIR *dirp);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
telldir(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_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 appropri-
EBADF Invalid directory stream descriptor dirp.
Multithreading (see pthreads(7))
The telldir() function is thread-safe.
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 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.
closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3),