Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

telldir(3) [opendarwin man page]

TELLDIR(3)						     Linux Programmer's Manual							TELLDIR(3)

NAME
telldir - return current location in directory stream SYNOPSIS
#include <dirent.h> long telldir(DIR *dirp); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): telldir(): _XOPEN_SOURCE || /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE 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 appro- priately. 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
POSIX.1-2001, POSIX.1-2008, 4.3BSD. NOTES
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 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 ALSO
closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2017-09-15 TELLDIR(3)

Check Out this Related Man Page

SEEKDIR(3)                                                   Linux Programmer's Manual                                                  SEEKDIR(3)

NAME
seekdir - set the position of the next readdir() call in the directory stream. SYNOPSIS
#include <dirent.h> void seekdir(DIR *dirp, long loc); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): seekdir(): _XOPEN_SOURCE || /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE DESCRIPTION
The seekdir() function sets the location in the directory stream from which the next readdir(2) call will start. The loc argument should be a value returned by a previous call to telldir(3). RETURN VALUE
The seekdir() function returns no value. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------+---------------+---------+ |Interface | Attribute | Value | +----------+---------------+---------+ |seekdir() | Thread safety | MT-Safe | +----------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, 4.3BSD. NOTES
In glibc up to version 2.1.1, the type of the loc argument was off_t. POSIX.1-2001 specifies long, and this is the type used since glibc 2.1.2. See telldir(3) for information on why you should be careful in making any assumptions about the value in this argument. SEE ALSO
lseek(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), telldir(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2016-03-15 SEEKDIR(3)
Man Page