|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
|
|
|
if_nametoindex(3) Library Functions Manual if_nametoindex(3)
if_nametoindex, if_indextoname - mappings between network
interface names and indexes
Standard C library (libc, -lc)
#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 to
indicate the error.
On success, if_indextoname() returns ifname; on error, NULL is
returned and errno is set to indicate the error.
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.1-2008, RFC 3493.
POSIX.1-2001. BSDi.
getifaddrs(3), if_nameindex(3), ifconfig(8)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 if_nametoindex(3)
Pages that refer to this page: if_nameindex(3)
|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|