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+'\" et
+.TH SEEKDIR "3P" 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
+seekdir
+\(em set the position of a directory stream
+.SH SYNOPSIS
+.LP
+.nf
+#include <dirent.h>
+.P
+void seekdir(DIR *\fIdirp\fP, long \fIloc\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIseekdir\fR()
+function shall set the position of the next
+\fIreaddir\fR()
+operation on the directory stream specified by
+.IR dirp
+to the position specified by
+.IR loc .
+The value of
+.IR loc
+should have been returned from an earlier call to
+\fItelldir\fR()
+using the same directory stream. The new position reverts to the one
+associated with the directory stream when
+\fItelldir\fR()
+was performed.
+.P
+If the value of
+.IR loc
+was not obtained from an earlier call to
+\fItelldir\fR(),
+or if a call to
+\fIrewinddir\fR()
+occurred between the call to
+\fItelldir\fR()
+and the call to
+\fIseekdir\fR(),
+the results of subsequent calls to
+\fIreaddir\fR()
+are unspecified.
+.SH "RETURN VALUE"
+The
+\fIseekdir\fR()
+function shall not return a value.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+The original standard developers perceived that there were restrictions
+on the use of the
+\fIseekdir\fR()
+and
+\fItelldir\fR()
+functions related to implementation details, and for that reason these
+functions need not be supported on all POSIX-conforming systems. They
+are required on implementations supporting the XSI option.
+.P
+One of the perceived problems of implementation is that returning to a
+given point in a directory is quite difficult to describe formally, in
+spite of its intuitive appeal, when systems that use B-trees, hashing
+functions, or other similar mechanisms to order their directories are
+considered. The definition of
+\fIseekdir\fR()
+and
+\fItelldir\fR()
+does not specify whether, when using these interfaces, a given
+directory entry will be seen at all, or more than once.
+.P
+On systems not supporting these functions, their capability can
+sometimes be accomplished by saving a filename found by
+\fIreaddir\fR()
+and later using
+\fIrewinddir\fR()
+and a loop on
+\fIreaddir\fR()
+to relocate the position from which the filename was saved.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIfdopendir\fR\^(\|)",
+.IR "\fIreaddir\fR\^(\|)",
+.IR "\fItelldir\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<dirent.h>\fP",
+.IR "\fB<sys_types.h>\fP"
+.\"
+.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 .