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+>IF_NAMETOINDEX(3) System Library Functions Manual IF_NAMETOINDEX(3)
+
+NAME
+ if_nametoindex, if_indextoname, if_nameindex, if_freenameindex - convert
+ interface index to name, and vice versa
+
+SYNOPSIS
+ #include <net/if.h>
+
+ unsigned int
+ if_nametoindex(const char *ifname);
+
+ char *
+ if_indextoname(unsigned int ifindex, char *ifname);
+
+ struct if_nameindex *
+ if_nameindex(void);
+
+ void
+ if_freenameindex(struct if_nameindex *ptr);
+
+DESCRIPTION
+ These functions map interface indexes to interface names (such as
+ ``lo0''), and vice versa.
+
+ The if_nametoindex() function converts an interface name specified by the
+ ifname argument to an interface index (positive integer value). If the
+ specified interface does not exist, 0 will be returned.
+
+ if_indextoname() converts an interface index specified by the ifindex
+ argument to an interface name. The ifname argument must point to a
+ buffer of at least IF_NAMESIZE bytes into which the interface name corre-
+ sponding to the specified index is returned. (IF_NAMESIZE is also
+ defined in <net/if.h> and its value includes a terminating null byte at
+ the end of the interface name.) This pointer is also the return value of
+ the function. If there is no interface corresponding to the specified
+ index, NULL is returned.
+
+ if_nameindex() returns an array of if_nameindex structures.
+ if_nametoindex is also defined in <net/if.h>, and is as follows:
+
+ struct if_nameindex {
+ unsigned int if_index; /* 1, 2, ... */
+ char *if_name; /* null terminated name: "le0", ... */
+ };
+
+ The end of the array of structures is indicated by a structure with an
+ if_index of 0 and an if_name of NULL. The function returns a null
+ pointer on error. The memory used for this array of structures along
+ with the interface names pointed to by the if_name members is obtained
+ dynamically. This memory is freed by the if_freenameindex() function.
+
+ if_freenameindex() takes a pointer that was returned by if_nameindex() as
+ argument (ptr), and it reclaims the region allocated.
+
+DIAGNOSTICS
+ if_nametoindex() returns 0 on error, positive integer on success.
+ if_indextoname() and if_nameindex() return NULL on errors.
+
+SEE ALSO
+ R. Gilligan, S. Thomson, J. Bound, and W. Stevens, ``Basic Socket Inter-
+ face Extensions for IPv6,'' RFC2553, March 1999.
+
+STANDARDS
+ These functions are defined in ``Basic Socket Interface Extensions for
+ IPv6'' (RFC2533).
+
+BSD May 21, 1998 BSD
+ </PRE
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