1socket_getifidx(3)         Library Functions Manual         socket_getifidx(3)
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NAME

6       socket_getifidx - get interface number
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SYNTAX

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

14       socket_getifidx  returns  the  interface  number for a symbolic network
15       interface name (like "eth0" on Linux, for example).
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17       The interface number can be used as scope_id for IPv6 communications on
18       link-local addresses.
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20       If  something  goes  wrong,  socket_getifidx  returns -1, setting errno
21       appropriately.
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SEE ALSO

25       socket_getifname(3), socket_connect6(3)
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29                                                            socket_getifidx(3)