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man:if_nametoindex

IF_NAMETOINDEX(3) Linux Programmer's Manual IF_NAMETOINDEX(3)

NAME

     if_nametoindex,  if_indextoname  -  mappings  between network interface
     names and indexes

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  inter-
     face 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 appropriately.
     On success, if_indextoname() returns ifname; on error, NULL is returned
     and errno is set appropriately.

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 |
     +-----------------------------------+---------------+---------+

CONFORMING TO

     POSIX.1-2001, POSIX.1-2008, RFC 3493.
     This function first appeared in BSDi.

SEE ALSO

     getifaddrs(3), if_nameindex(3), ifconfig(8)

COLOPHON

     This  page  is  part of release 4.16 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 2017-09-15 IF_NAMETOINDEX(3)

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