Standards
| Standards / Extensions |
C or C++ |
Dependencies |
|---|
RFC3542
|
both |
z/OS® V1R7 |
Format
#define _OPEN_SYS_SOCK_IPV6
#include <netinet/in.h>
int inet6_opt_next(void *extbuf, socklen_t extlen, int offset,
uint8_t *typep, socklen_t *lenp, void **databufp);
General description
inet6_opt_next() parses
received option extension headers and returns the next option.
Returned value
If successful, inet6_opt_next()
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.
Upon failure, returns
-1 and errno is set to one of the following:
EINVAL If
one of the following is true:
- extbuf is NULL;
- extlen is not a positive multiple of
8;
- offset is less than 0 or greater than
or equal to extlen;
- typep, lenp,
or databufp is NULL;
- there are no more options;
- the extension header is malformed.
Usage notes
- extbuf and extlen specifies
the extension header.
- offset should either be zero (for the
first option) or the length returned by a previous call to inet6_opt_next()
or inet6_opt_find(). It specifies the position to continue scanning
the extension buffer. The next option is returned by updating typep, lenp,
and databufp.
- typep points to the option type field.
- lenp stores the length of the option
data (excluding the option type and option length fields).
- databufp points to the data field of
the of the option.