ftw.h(0P)		   POSIX Programmer's Manual		     ftw.h(0P)

PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       ftw.h — file tree traversal

SYNOPSIS
       #include <ftw.h>

DESCRIPTION
       The <ftw.h> header shall define the FTW structure, which shall include
       at least the following members:


	   int	base
	   int	level

       The <ftw.h> header shall define the following symbolic constants 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	     Non-directory 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 the following symbolic constants 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 POSIX.1‐2017, ftw(), nftw()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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		     2017			     ftw.h(0P)