IF_NAMETOINDEX(P) POSIX Programmer's Manual IF_NAMETOINDEX(P)NAMEif_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 corre‐
sponding to name ifname.
RETURN VALUE
The corresponding index if ifname is the name of an interface; other‐
wise, zero.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOgetsockopt() , 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 Technology
-- 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(P)
