Section: POSIX Programmer's Manual (0P)
Updated: 2003
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NAME

ftw.h - file tree traversal  

SYNOPSIS

#include <ftw.h>  

DESCRIPTION

The <ftw.h> header shall define the FTW structure that includes at least the following members: 


int  base
int  level

The <ftw.h> header shall define macros for use as values of the third argument to the application-supplied function that is passed as the second argument to ftw() and nftw():

FTW_F
File.
FTW_D
Directory.
FTW_DNR
Directory without read permission.
FTW_DP
Directory with subdirectories visited.
FTW_NS
Unknown type; stat() failed.
FTW_SL
Symbolic link.
FTW_SLN
Symbolic link that names a nonexistent file.

The <ftw.h> header shall define macros for use as values of the fourth argument to nftw():

FTW_PHYS
Physical walk, does not follow symbolic links. Otherwise, nftw() follows links but does not walk down any path that crosses itself.
FTW_MOUNT
The walk does not cross a mount point.
FTW_DEPTH
All subdirectories are visited before the directory itself.
FTW_CHDIR
The walk changes to each directory before reading it.

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided. 


int ftw(const char *, int (*)(const char *, const struct stat *,
    int), int);
int nftw(const char *, int (*)(const char *, const struct stat *,
    int, struct FTW*), int, int);

The <ftw.h> header shall define the stat structure and the symbolic names for st_mode and the file type test macros as described in <sys/stat.h> .

Inclusion of the <ftw.h> header may also make visible all symbols from <sys/stat.h>.

The following sections are informative.  

APPLICATION USAGE

None.  

RATIONALE

None.  

FUTURE DIRECTIONS

None.  

SEE ALSO

<sys/stat.h>, the System Interfaces volume of IEEE Std 1003.1-2001, ftw(), nftw()  

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 .