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25 .\" $FreeBSD: src/lib/libc/net/if_indextoname.3,v 1.11 2005/11/23 10:49:07 ru Exp $
35 .Nd provide mappings between interface names and indexes
43 .Fn if_nametoindex "const char *ifname"
45 .Fn if_indextoname "unsigned int ifindex" "char *ifname"
46 .Ft "struct if_nameindex *"
47 .Fn if_nameindex "void"
49 .Fn if_freenameindex "struct if_nameindex *ptr"
53 function maps the interface name specified in
55 to its corresponding index.
56 If the specified interface does not exist, it returns 0.
60 function maps the interface index specified in
62 to it corresponding name, which is copied into the
65 which must be of at least
68 This pointer is also the return value of the function.
69 If there is no interface corresponding to the specified
76 function returns an array of
78 structures, one structure per interface, as
79 defined in the include file
83 structure contains at least the following entries:
85 unsigned int if_index; /* 1, 2, ... */
86 char *if_name; /* null terminated name: "lnc0", ... */
89 The end of the array of structures is indicated by a structure with an
97 pointer is returned upon an error.
101 function frees the dynamic memory that was
105 Upon successful completion,
107 returns the index number of the interface.
108 If the interface is not found, a value of 0 is returned and
112 A value of 0 is also returned if an error
113 occurs while retrieving the list of interfaces via
116 Upon successful completion,
120 If the interface is not found, a
122 pointer is returned and
128 pointer is also returned if an error
129 occurs while retrieving the list of interfaces via
137 occurs while retrieving the list of interfaces via
139 or if sufficient memory cannot be allocated.
153 The implementation first appeared in BSDi