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

  • BSD mandoc
     

    NAME

    
    
    ftw , nftw
    
     - traverse (walk) a file tree
    
     
    

    SYNOPSIS

       #include <ftw.h>
    int Fo ftw Fa const char *path Fa int lp]*fnrp]lp]const char *, const struct stat *, intrp] Fa int maxfds Fc Ft int Fo nftw Fa const char *path Fa int lp]*fnrp]lp]const char *, const struct stat *, int, struct FTW *rp] Fa int maxfds Fa int flags Fc  

    DESCRIPTION

    The ftw ();
    and nftw ();
    functions traverse (walk) the directory hierarchy rooted in Fa path . For each object in the hierarchy, these functions call the function pointed to by Fa fn . The ftw ();
    function passes this function a pointer to a NUL -terminated string containing the name of the object, a pointer to a Vt stat structure corresponding to the object, and an integer flag. The nftw ();
    function passes the aforementioned arguments plus a pointer to a Vt FTW structure as defined by    #include <ftw.h>
    (shown below):
    struct FTW {
        int base;   /* offset of basename into pathname */
        int level;  /* directory depth relative to starting point */
    };
    

    Possible values for the flag passed to Fa fn are:

    FTW_F
    A regular file.
    FTW_D
    A directory being visited in pre-order.
    FTW_DNR
    A directory which cannot be read. The directory will not be descended into.
    FTW_DP
    A directory being visited in post-order Fn ( nftw only).
    FTW_NS
    A file for which no stat(2) information was available. The contents of the Vt stat structure are undefined.
    FTW_SL
    A symbolic link.
    FTW_SLN
    A symbolic link with a non-existent target Fn ( nftw only).

    The ftw ();
    function traverses the tree in pre-order. That is, it processes the directory before the directory's contents.

    The Fa maxfds argument specifies the maximum number of file descriptors to keep open while traversing the tree. It has no effect in this implementation.

    The nftw ();
    function has an additional Fa flags argument with the following possible values:

    FTW_PHYS
    Physical walk, do not follow symbolic links.
    FTW_MOUNT
    The walk will not cross a mount point.
    FTW_DEPTH
    Process directories in post-order. Contents of a directory are visited before the directory itself. By default, nftw ();
    traverses the tree in pre-order.
    FTW_CHDIR
    Change to a directory before reading it. By default, nftw ();
    will change its starting directory. The current working directory will be restored to its original value before nftw ();
    returns.

     

    RETURN VALUES

    If the tree was traversed successfully, the ftw ();
    and nftw ();
    functions return 0. If the function pointed to by Fa fn returns a non-zero value, ftw ();
    and nftw ();
    will stop processing the tree and return the value from Fa fn . Both functions return -1 if an error is detected.  

    ERRORS

    The ftw ();
    and nftw ();
    functions may fail and set errno for any of the errors specified for the library functions close(2), open(2), stat(2), malloc(3), opendir(3) and readdir(3). If the FTW_CHDIR flag is set, the nftw ();
    function may fail and set errno for any of the errors specified for chdir(2). In addition, either function may fail and set errno as follows:

    Bq Er EINVAL
    The Fa maxfds argument is less than 1.

     

    SEE ALSO

    chdir(2), close(2), open(2), stat(2), fts(3), malloc(3), opendir(3), readdir(3)  

    STANDARDS

    The ftw ();
    and nftw ();
    functions conform to St -p1003.1-2001 .  

    HISTORY

    These functions first appeared in AT&T System V.3 . Their first Fx appearance was in Fx 5.3 .  

    BUGS

    The Fa maxfds argument is currently ignored.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    STANDARDS
    HISTORY
    BUGS


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