socket_getifidx(3)

NAME
socket_getifidx - get interface number

SYNTAX
#include <socket.h> int socket_getifidx(const char* ifname);

DESCRIPTION
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.

SEE ALSO
socket_getifname(3), socket_connect6(3)