if_nametoindex() - convert interface name to interface index

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#include <net.if.h>

unsigned int if_nametoindex(const char * ifname);

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Description

The function if_nametoindex() returns the interface index corresponding to the specified interface name. ifname is a null-terminated string containing the interface name.

Return value

If execution is successful, if_nametoindex() returns the interface index. Otherwise 0 is returned

Errors indicated by errno

No errors are defined.