net_if.h - Man Page

sockets local interfaces


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.


#include <net/if.h>


The <net/if.h> header shall define the if_nameindex structure, which shall include 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 symbolic constant 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.

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

The following sections are informative.

Application Usage




Future Directions


See Also

The System Interfaces volume of POSIX.1-2017, if_freenameindex(), if_indextoname(), if_nameindex(), if_nametoindex()

Referenced By

if_freenameindex(3p), if_indextoname(3p), if_nameindex(3p), if_nametoindex(3p).

2017 IEEE/The Open Group POSIX Programmer's Manual