if_nameindex()

Return a list of interfaces

Synopsis:

#include <net/if.h>

struct if_nameindex * if_nameindex( void );

Library:

libsocket

Use the -l socket option to qcc to link against this library.

Description:

The if_nameindex() function returns an array of if_nameindex structures, with one structure per interface, as defined in the include file <net/if.h>. The if_nameindex structure contains at least the following members:

unsigned int if_index: The index of the interface (1, 2, …).
char *if_name: A null-terminated name (e.g., le0).

The end of the array of structures is indicated by an entry with an if_index of 0 and an if_name of NULL.

Returns:

A valid array of if_nameindex structures, or NULL if and error occurred while using getifaddrs() to retrieve the list, or there wasn't enough memory available.

Classification:

POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes