if_indextoname() - convert interface index to interface name

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#include <sys.socket.h>
#include <net.if.h>

char * if_indextoname(unsigned int ifindex, char * ifname);

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Description

The function if_indextoname() returns the interface name corresponding to the specified interface index. To achieve this, a pointer to a buffer of minimum length IF_NAMESIZE (present in <net.if.h>) is supplied in ifname.

Return value

If execution is successful, if_indextoname() returns the interface name stored in ifname. Otherwise a NULL pointer is returned

Errors indicated by errno

ENXIO

No interface name corresponding to the specified index was found.