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    The following form allows you to view linux man pages.

    Command:

    if_indextoname

    
    
    
    

    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_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).
    
    
    

    CONFORMING TO

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

    SEE ALSO

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

    GNU 2012-12-14 IF_NAMETOINDEX(3)

    
    
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