Section: POSIX Programmer's Manual (3P)
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.
--- map a network interface index to its corresponding name
char *if_indextoname(unsigned ifindex, char *ifname);
function shall map an interface index to its corresponding name.
When this function is called,
shall point to a buffer of at least
bytes. The function shall place in this buffer the name of the interface
is an interface index, then the function shall return the value supplied in
which points to a buffer now containing the interface name. Otherwise,
the function shall return a null pointer and set
to indicate the error.
function shall fail if:
The interface does not exist.
The following sections are informative.
The Base Definitions volume of POSIX.1-2017,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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
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