socket_getifidx3diet
Get interface number
Usage
#include <socket.h>
int socket_getifidx(const char* ifname);
Overview
socket_getifidx returns the interface number for a symbolic network interface name (like "eth0" on Linux, for example).
The interface number can be used as scope_id for IPv6 communications on link-local addresses.
If something goes wrong, socket_getifidx returns -1, setting errno appropriately.
Releases
Unchanged in 4 releases since Debian 3.1 (Sarge).