if_nameindex - return all network interface names and indexes
struct if_nameindex *if_nameindex(void);
The if_nameindex() function shall return an array of if_nameindex structures, one structure per interface. The end of the array is indicated by a structure with an if_index field of zero and an if_name field of NULL.
Applications should call if_freenameindex() to release the memory that may be dynamically allocated by this function, after they have finished using it.
An array of structures identifying local interfaces. A NULL pointer is returned upon an error, with errno set to indicate the error.
The if_nameindex() function may fail if:
- Insufficient resources are available to complete the function.
getsockopt(), if_freenameindex(), if_indextoname(), if_nametoindex(), setsockopt(), the Base Definitions volume of IEEE Std 1003.1-2001, <net/if.h>
First released in Issue 6. Derived from the XNS, Issue 5.2 specification.