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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11

NAME

13       if_indextoname — map a network interface  index  to  its  corresponding
14       name
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SYNOPSIS

17       #include <net/if.h>
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19       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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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

49       None.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

55       getsockopt(),   if_freenameindex(),  if_nameindex(),  if_nametoindex(),
56       setsockopt()
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58       The Base Definitions volume of POSIX.1‐2008, <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, 2013 Edition, Standard for Information Technology
63       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
64       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
65       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
66       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
67       event of any discrepancy between this version and the original IEEE and
68       The  Open Group Standard, the original IEEE and The Open Group Standard
69       is the referee document. The original Standard can be  obtained  online
70       at http://www.unix.org/online.html .
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72       Any  typographical  or  formatting  errors that appear in this page are
73       most likely to have been introduced during the conversion of the source
74       files  to  man page format. To report such errors, see https://www.ker‐
75       nel.org/doc/man-pages/reporting_bugs.html .
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79IEEE/The Open Group                  2013                   IF_INDEXTONAME(3P)
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