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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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