IF_NAMEINDEX(3P) POSIX Programmer's Manual IF_NAMEINDEX(3P)PROLOG
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.
NAMEif_nameindex - return all network interface names and indexes
SYNOPSIS
#include <net/if.h>
struct if_nameindex *if_nameindex(void);
DESCRIPTION
The if_nameindex() function shall return an array of if_nameindex
structures, one structure per interface. The end of the array is indi‐
cated 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.
RETURN VALUE
An array of structures identifying local interfaces. A NULL pointer is
returned upon an error, with errno set to indicate the error.
ERRORS
The if_nameindex() function may fail if:
ENOBUFS
Insufficient resources are available to complete the function.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOgetsockopt(), if_freenameindex(), if_indextoname(), if_nametoindex(),
setsockopt(), the Base Definitions volume of IEEE Std 1003.1-2001,
<net/if.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. 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 http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 IF_NAMEINDEX(3P)
