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net_if.h(0P) POSIX Programmer's Manual net_if.h(0P)

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.

net/if.h — sockets local interfaces

#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.




The System Interfaces volume of POSIX.1‐2008, if_freenameindex(), if_indextoname(), if_nameindex(), if_nametoindex()

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at .

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2013 IEEE/The Open Group