if_nametoindex
Section: C Library Functions (3)
Updated: 2022-12-15
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NAME
if_nametoindex, if_indextoname - mappings between network interface
names and indexes
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#include <net/if.h>
unsigned int if_nametoindex(const char *ifname);
char *if_indextoname(unsigned int ifindex, char *ifname);
DESCRIPTION
The
if_nametoindex()
function returns the index of the network interface
corresponding to the name
ifname.
The
if_indextoname()
function returns the name of the network interface
corresponding to the interface index
ifindex.
The name is placed in the buffer pointed to by
ifname.
The buffer must allow for the storage of at least
IF_NAMESIZE
bytes.
RETURN VALUE
On success,
if_nametoindex()
returns the index number of the network interface;
on error, 0 is returned and
errno
is set to indicate the error.
On success,
if_indextoname()
returns
ifname;
on error, NULL is returned and
errno
is set to indicate the error.
ERRORS
if_nametoindex()
may fail and set
errno
if:
- ENODEV
-
No interface found with given name.
if_indextoname()
may fail and set
errno
if:
- ENXIO
-
No interface found for the index.
if_nametoindex()
and
if_indextoname()
may also fail for any of the errors specified for
socket(2)
or
ioctl(2).
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
if_nametoindex(),
if_indextoname()
| Thread safety | MT-Safe
|
STANDARDS
POSIX.1-2001, POSIX.1-2008, RFC 3493.
This function first appeared in BSDi.
SEE ALSO
getifaddrs(3),
if_nameindex(3),
ifconfig(8)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- SEE ALSO
-
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