if_nametoindex - map a network interface name to its corresponding index
#include <net/if.h>
unsigned if_nametoindex(const char *ifname);
The if_nametoindex() function shall return the interface index corresponding to name ifname.
The corresponding index if ifname is the name of an interface; otherwise, zero.
No errors are defined.
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getsockopt(), if_freenameindex(), if_indextoname(), if_nameindex(), setsockopt(), the Base Definitions volume of IEEE Std 1003.1-2001, <net/if.h>
First released in Issue 6. Derived from the XNS, Issue 5.2 specification.