if_nametoindex man page

Prolog

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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.

See Also

getsockopt(), if_freenameindex(), if_indextoname(), if_nameindex(), setsockopt()

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

Info

2013 IEEE/The Open Group POSIX Programmer's Manual