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+'\" et
+.TH ftw.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH 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.
+.\"
+.SH NAME
+ftw.h
+\(em file tree traversal
+.SH SYNOPSIS
+.LP
+.nf
+#include <ftw.h>
+.fi
+.SH DESCRIPTION
+The
+.IR <ftw.h> 
+header shall define the
+.BR FTW
+structure, which shall include at least the following members:
+.sp
+.RS 4
+.nf
+
+int  base
+int  level
+.fi
+.P
+.RE
+.P
+The
+.IR <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
+\fIftw\fR()
+and
+\fInftw\fR():
+.IP FTW_F 14
+Non-directory file.
+.IP FTW_D 14
+Directory.
+.IP FTW_DNR 14
+Directory without read permission.
+.IP FTW_DP 14
+Directory with subdirectories visited.
+.IP FTW_NS 14
+Unknown type;
+\fIstat\fR()
+failed.
+.IP FTW_SL 14
+Symbolic link.
+.IP FTW_SLN 14
+Symbolic link that names a nonexistent file.
+.P
+The
+.IR <ftw.h> 
+header shall define the following symbolic constants for use as
+values of the fourth argument to
+\fInftw\fR():
+.IP FTW_PHYS 14
+Physical walk, does not follow symbolic links. Otherwise,
+\fInftw\fR()
+follows links but does not walk down any path that crosses itself.
+.IP FTW_MOUNT 14
+The walk does not cross a mount point.
+.IP FTW_DEPTH 14
+All subdirectories are visited before the directory itself.
+.IP FTW_CHDIR 14
+The walk changes to each directory before reading it.
+.P
+The following shall be declared as functions and may also be defined as
+macros. Function prototypes shall be provided.
+.sp
+.RS 4
+.nf
+
+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);
+.fi
+.P
+.RE
+.P
+The
+.IR <ftw.h> 
+header shall define the
+.BR stat
+structure and the symbolic names for
+.IR st_mode
+and the file type test macros as described in
+.IR <sys/stat.h> .
+.P
+Inclusion of the
+.IR <ftw.h> 
+header may also make visible all symbols from
+.IR <sys/stat.h> .
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fB<sys_stat.h>\fP"
+.P
+The System Interfaces volume of POSIX.1\(hy2017,
+.IR "\fIftw\fR\^(\|)",
+.IR "\fInftw\fR\^(\|)"
+.\"
+.SH 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 .
+.PP
+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 .