centos man page for if_nametoindex

IF_NAMETOINDEX(3P)					     POSIX Programmer's Manual						IF_NAMETOINDEX(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_nametoindex - map a network interface name to its corresponding index

SYNOPSIS
       #include <net/if.h>

       unsigned if_nametoindex(const char *ifname);

DESCRIPTION
       The if_nametoindex() function shall return the interface index corresponding to name ifname.

RETURN VALUE
       The corresponding index if ifname is the name of an interface; otherwise, zero.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       getsockopt(), if_freenameindex(), if_indextoname(), if_nameindex(), setsockopt(), the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
       <net/if.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003							IF_NAMETOINDEX(3P)