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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "IF_INDEXTONAME" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" if_indextoname 
+.SH NAME
+if_indextoname \- map a network interface index to its corresponding
+name
+.SH SYNOPSIS
+.LP
+\fB#include <net/if.h>
+.br
+.sp
+char *if_indextoname(unsigned\fP \fIifindex\fP\fB, char *\fP\fIifname\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIif_indextoname\fP() function shall map an interface index to
+its corresponding name.
+.LP
+When this function is called, \fIifname\fP shall point to a buffer
+of at least {IF_NAMESIZE} bytes. The function shall place in
+this buffer the name of the interface with index \fIifindex\fP.
+.SH RETURN VALUE
+.LP
+If \fIifindex\fP is an interface index, then the function shall return
+the value supplied in \fIifname\fP, which points to a
+buffer now containing the interface name. Otherwise, the function
+shall return a NULL pointer and set \fIerrno\fP to indicate the
+error.
+.SH ERRORS
+.LP
+The \fIif_indextoname\fP() function shall fail if:
+.TP 7
+.B ENXIO
+The interface does not exist.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIgetsockopt\fP() , \fIif_freenameindex\fP() , \fIif_nameindex\fP()
+, \fIif_nametoindex\fP() , \fIsetsockopt\fP() , the Base Definitions
+volume of IEEE\ Std\ 1003.1-2001, \fI<net/if.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 .