|telldir(3)||Library Functions Manual||telldir(3)|
telldir - return current location in directory stream
Standard C library (libc, -lc)
long telldir(DIR *dirp);
|| /* Glibc >= 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 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 to indicate the error.
- Invalid directory stream descriptor dirp.
For an explanation of the terms used in this section, see attributes(7).
|telldir ()||Thread safety||MT-Safe|
POSIX.1-2001, POSIX.1-2008, 4.3BSD.
Up to glibc 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.
|2022-12-15||Linux man-pages 6.02|