1IF_INDEXTONAME(3P)         POSIX Programmer's Manual        IF_INDEXTONAME(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       if_indextoname - map a network interface  index  to  its  corresponding
13       name
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SYNOPSIS

16       #include <net/if.h>
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18       char *if_indextoname(unsigned ifindex, char *ifname);
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DESCRIPTION

22       The  if_indextoname() function shall map an interface index to its cor‐
23       responding name.
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25       When this function is called, ifname shall point  to  a  buffer  of  at
26       least  {IF_NAMESIZE} bytes. The function shall place in this buffer the
27       name of the interface with index ifindex.
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RETURN VALUE

30       If ifindex is an interface index, then the function  shall  return  the
31       value  supplied  in ifname, which points to a buffer now containing the
32       interface name. Otherwise, the function shall return a NULL pointer and
33       set errno to indicate the error.
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ERRORS

36       The if_indextoname() function shall fail if:
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38       ENXIO  The interface does not exist.
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41       The following sections are informative.
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EXAMPLES

44       None.
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APPLICATION USAGE

47       None.
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RATIONALE

50       None.
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FUTURE DIRECTIONS

53       None.
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SEE ALSO

56       getsockopt(),   if_freenameindex(),  if_nameindex(),  if_nametoindex(),
57       setsockopt(), the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
58       <net/if.h>
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61       Portions  of  this text are reprinted and reproduced in electronic form
62       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
63       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
64       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
65       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
66       event of any discrepancy between this version and the original IEEE and
67       The  Open Group Standard, the original IEEE and The Open Group Standard
68       is the referee document. The original Standard can be  obtained  online
69       at http://www.opengroup.org/unix/online.html .
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73IEEE/The Open Group                  2003                   IF_INDEXTONAME(3P)
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