NAME
telldir - return current location in directory stream SYNOPSIS
#include
long telldir(DIR *dirp); Feature Test Macro Requirements for glibc (see featuretestmacros(7)): telldir(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE 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 appropri‐ ately. 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
4.3BSD, POSIX.1-2001. NOTES In glibc up to version 2.1.1, the return type of telldir() was offt.
POSIX.1-2001 specifies long, and this is the type used since glibc 2.1.2. In early file systems, the value returned by telldir() was a simple file offset within a directory. Modern file systems use tree or hash structures, rather than flat tables, to represent directories. On such file systems, 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
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2013-03-24 TELLDIR(3)