posix man page for if_indextoname

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

PROLOG
       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
       if_indextoname -- map a network interface index to its corresponding name

SYNOPSIS
       #include <net/if.h>

       char *if_indextoname(unsigned ifindex, char *ifname);

DESCRIPTION
       The if_indextoname() function shall map an interface index to its corresponding name.

       When this function is called, ifname 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 ifindex.

RETURN VALUE
       If  ifindex is an interface index, then the function shall return the value supplied in ifname, which points to a buffer now containing the
       interface name. Otherwise, the function shall return a null pointer and set errno to indicate the error.

ERRORS
       The if_indextoname() function shall fail if:

       ENXIO  The interface does not exist.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       getsockopt(), if_freenameindex(), if_nameindex(), if_nametoindex(), setsockopt()

       The Base Definitions volume of POSIX.1-2008, <net_if.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       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 .

IEEE
/The Open Group						       2013							IF_INDEXTONAME(3P)