IF.H(7) Miscellaneous Information Manual IF.H(7)

net/if.h — sockets local interfaces

#include <net/if.h>

The <net/if.h> header shall define the structure that includes at least the following members:

unsigned  if_index  Numeric index of the interface.
char     *if_name   Null-terminated name of the interface.

The <net/if.h> header shall define the following macro for the length of a buffer containing an interface name (including the terminating NULL character):

Interface name length.

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

unsigned              if_nametoindex(const char *);
char                 *if_indextoname(unsigned, char *);
struct if_nameindex  *if_nameindex(void);
void                  if_freenameindex(struct if_nameindex *);

None.

None.

None.

The System Interfaces volume of IEEE Std 1003.1-2001 (“POSIX.1”), if_freenameindex(3), if_indextoname(3), if_nameindex(3), if_nametoindex(3)

First released in Issue 6. Derived from the XNS, Issue 5.2 specification.

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December 6, 2001 posix.fail