if_indextoname(3p) — Linux manual page

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
       corresponding 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(3p), if_freenameindex(3p), if_nameindex(3p),
       if_nametoindex(3p), setsockopt(3p)

       The Base Definitions volume of POSIX.1‐2017, net_if.h(0p)

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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               2017                IF_INDEXTONAME(3P)

Pages that refer to this page: net_if.h(0p), if_freenameindex(3p), if_nameindex(3p), if_nametoindex(3p)

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