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.

NAME¶

if_nametoindex - map a network interface name to its corresponding index

SYNOPSIS¶

#include <net/if.h>

unsigned if_nametoindex(const char *ifname);

DESCRIPTION¶

The if_nametoindex() function shall return the interface index corresponding to name ifname.

RETURN VALUE¶

The corresponding index if ifname is the name of an interface; otherwise, zero.

ERRORS¶

No errors are defined.

The following sections are informative.

EXAMPLES¶

None.

APPLICATION USAGE¶

None.

RATIONALE¶

None.

FUTURE DIRECTIONS¶

None.

SEE ALSO¶

getsockopt(), if_freenameindex(), if_indextoname(), if_nameindex(), 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 .