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socket_getifidx(3) | Library Functions Manual | socket_getifidx(3) |
NAME¶
socket_getifidx - get interface number
SYNTAX¶
#include <libowfat/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.