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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
       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 appropriately.

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

ERRORS

       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

   Multithreading (see pthreads(7))
       The if_nametoindex() and if_indextoname() functions are thread-safe.

CONFORMING TO

       RFC 3493, POSIX.1-2001.

       This function first appeared in BSDi.

SEE ALSO

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

COLOPHON

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



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