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socket_getifidx(3)    DragonFly Library Functions Manual    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)

                                                            socket_getifidx(3)