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seekdir(3p) [posix man page]

SEEKDIR(3P)						     POSIX Programmer's Manual						       SEEKDIR(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
seekdir -- set the position of a directory stream SYNOPSIS
#include <dirent.h> void seekdir(DIR *dirp, long loc); DESCRIPTION
The seekdir() function shall set the position of the next readdir() operation on the directory stream specified by dirp to the position specified by loc. The value of loc should have been returned from an earlier call to telldir() using the same directory stream. The new position reverts to the one associated with the directory stream when telldir() was performed. If the value of loc was not obtained from an earlier call to telldir(), or if a call to rewinddir() occurred between the call to telldir() and the call to seekdir(), the results of subsequent calls to readdir() are unspecified. RETURN VALUE
The seekdir() function shall not return a value. ERRORS
No errors are defined. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
The original standard developers perceived that there were restrictions on the use of the seekdir() and telldir() functions related to implementation details, and for that reason these functions need not be supported on all POSIX-conforming systems. They are required on implementations supporting the XSI option. One of the perceived problems of implementation is that returning to a given point in a directory is quite difficult to describe formally, in spite of its intuitive appeal, when systems that use B-trees, hashing functions, or other similar mechanisms to order their directories are considered. The definition of seekdir() and telldir() does not specify whether, when using these interfaces, a given directory entry will be seen at all, or more than once. On systems not supporting these functions, their capability can sometimes be accomplished by saving a filename found by readdir() and later using rewinddir() and a loop on readdir() to relocate the position from which the filename was saved. FUTURE DIRECTIONS
None. SEE ALSO
fdopendir(), readdir(), telldir() The Base Definitions volume of POSIX.1-2008, <dirent.h>, <sys_types.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan- dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html . Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . IEEE
/The Open Group 2013 SEEKDIR(3P)

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TELLDIR(3P)						     POSIX Programmer's Manual						       TELLDIR(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
telldir -- current location of a named directory stream SYNOPSIS
#include <dirent.h> long telldir(DIR *dirp); DESCRIPTION
The telldir() function shall obtain the current location associated with the directory stream specified by dirp. If the most recent operation on the directory stream was a seekdir(), the directory position returned from the telldir() shall be the same as that supplied as a loc argument for seekdir(). RETURN VALUE
Upon successful completion, telldir() shall return the current location of the specified directory stream. ERRORS
No errors are defined. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
fdopendir(), readdir(), seekdir() The Base Definitions volume of POSIX.1-2008, <dirent.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan- dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html . Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . IEEE
/The Open Group 2013 TELLDIR(3P)
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