ftw.h - file tree traversal
The <ftw.h> header shall define the FTW structure that includes at
least the following members:
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():
Directory without read permission.
FTW_DP Directory with subdirectories visited.
FTW_NS Unknown type; stat() failed.
FTW_SL Symbolic link.
Symbolic link that names a nonexistent file.
The <ftw.h> header shall define macros for use as values of the fourth
argument to nftw():
Physical walk, does not follow symbolic links. Otherwise, nftw()
follows links but does not walk down any path that crosses
The walk does not cross a mount point.
All subdirectories are visited before the directory itself.
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 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
Inclusion of the <ftw.h> header may also make visible all symbols from
The following sections are informative.
<sys/stat.h> , the System Interfaces volume of IEEE Std 1003.1-2001,
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 .