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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "QSORT" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" qsort 
+.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
+qsort \- sort a table of data
+.SH SYNOPSIS
+.LP
+\fB#include <stdlib.h>
+.br
+.sp
+void qsort(void *\fP\fIbase\fP\fB, size_t\fP \fInel\fP\fB, size_t\fP
+\fIwidth\fP\fB,
+.br
+\ \ \ \ \ \  int (*\fP\fIcompar\fP\fB)(const void *, const void *));
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIqsort\fP() function shall sort an array of \fInel\fP objects,
+the initial element of which is pointed to by
+\fIbase\fP. The size of each object, in bytes, is specified by the
+\fIwidth\fP argument. If the \fInel\fP argument has the value
+zero, the comparison function pointed to by \fIcompar\fP shall not
+be called and no rearrangement shall take place.
+.LP
+The application shall ensure that the comparison function pointed
+to by \fIcompar\fP does not alter the contents of the array.
+The implementation may reorder elements of the array between calls
+to the comparison function, but shall not alter the contents of
+any individual element.
+.LP
+When the same objects (consisting of width bytes, irrespective of
+their current positions in the array) are passed more than
+once to the comparison function, the results shall be consistent with
+one another. That is, they shall define a total ordering on
+the array.
+.LP
+The contents of the array shall be sorted in ascending order according
+to a comparison function. The \fIcompar\fP argument is a
+pointer to the comparison function, which is called with two arguments
+that point to the elements being compared. The application
+shall ensure that the function returns an integer less than, equal
+to, or greater than 0, if the first argument is considered
+respectively less than, equal to, or greater than the second. If two
+members compare as equal, their order in the sorted array is
+unspecified.
+.SH RETURN VALUE
+.LP
+The \fIqsort\fP() function shall not return a value.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The comparison function need not compare every byte, so arbitrary
+data may be contained in the elements in addition to the
+values being compared.
+.SH RATIONALE
+.LP
+The requirement that each argument (hereafter referred to as \fIp)\fP
+to the comparison function is a pointer to elements of
+the array implies that for every call, for each argument separately,
+all of the following expressions are nonzero:
+.sp
+.RS
+.nf
+
+\fB((char *)p - (char *)base) % width == 0
+(char *)p >= (char *)base
+(char *)p < (char *)base + nel * width
+\fP
+.fi
+.RE
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+The Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<stdlib.h>\fP
+.SH 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 .