telldir (3) - Linux Man Pages
telldir: return current location in directory stream
NAMEtelldir - return current location in directory stream
#include <dirent.h> long telldir(DIR *dirp);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe telldir() function returns the current location associated with the directory stream dirp.
RETURN VALUEOn success, the telldir() function returns the current location in the directory stream. On error, -1 is returned, and errno is set appropriately.
- Invalid directory stream descriptor dirp.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOPOSIX.1-2001, POSIX.1-2008, 4.3BSD.
NOTESIn 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 ALSOclosedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3)
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