The OpenNET Project / Index page

[ новости /+++ | форум | wiki | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

seekdir (3)
  • seekdir (3) ( Solaris man: Библиотечные вызовы )
  • seekdir (3) ( FreeBSD man: Библиотечные вызовы )
  • seekdir (3) ( Русские man: Библиотечные вызовы )
  • seekdir (3) ( Linux man: Библиотечные вызовы )
  • >> seekdir (3) ( POSIX man: Библиотечные вызовы )
  •  

    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(). 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 extension.

    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

    opendir() , readdir() , telldir() , the Base Definitions volume of IEEE Std 1003.1-2001, <dirent.h>, <stdio.h>, <sys/types.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. 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 Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


    Поиск по тексту MAN-ов: 




    Спонсоры:
    PostgresPro
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2022 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру