inet6_opt_next Subroutine
| Item | Description |
|---|---|
| –1 | There are no more options or the option extension header is malformed. |
Purpose
Parses received option extension headers returning the next option.
Syntax
int inet6_opt_next(void *extbuf, socklen_t extlen, int offset,
uint8_t *typep, socklen_t *lenp,
void **databufp);
Description
The inet6_opt_next subroutine parses received option extension headers, returning the next option. The next option is returned by updating the typep, lenp, and databufp parameters.
Parameters
| Item | Description |
|---|---|
| extbuf | Specifies the extension header. |
| extlen | Size of the buffer pointed to by extbuf. |
| offset | Specifies the position where scanning of the extension buffer can continue. Should either be 0 (for the first option) or the length returned by a previous call to inet6_opt_next() or inet6_opt_find(). |
| typep | Stores the option type. |
| lenp | Stores the length of the option data (excluding the option type and option length fields). |
| databufp | Points to the data field of the option. |
Return Values
The inet6_opt_next subroutine returns the updated "previous" length computed by advancing past the option that was returned. This returned "previous" length can then be passed to subsequent calls to inet6_opt_next(). This function does not return any PAD1 or PADN options.