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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
IF_NAMETOINDEX(3) Linux Programmer's Manual IF_NAMETOINDEX(3)
if_nametoindex, if_indextoname - mappings between network interface
names and indexes
#include <net/if.h>
unsigned int if_nametoindex(const char *ifname);
char *if_indextoname(unsigned int ifindex, char *ifname);
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.
On success, if_nametoindex() returns the index number of the network
interface; on error, 0 is returned and errno is set appropriately.
On success, if_indextoname() returns ifname; on error, NULL is
returned and errno is set appropriately.
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).
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────────────────────────────┼───────────────┼─────────┤
│if_nametoindex(), if_indextoname() │ Thread safety │ MT-Safe │
└───────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008, RFC 3493.
This function first appeared in BSDi.
getifaddrs(3), if_nameindex(3), ifconfig(8)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2017-07-13 IF_NAMETOINDEX(3)
Pages that refer to this page: if_nameindex(3)