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# PRMcastRequest
Structure used to specify values for the `PR_SockOpt_AddMember` and
`PR_SockOpt_DropMember` socket options that define a request to join
or leave a multicast group.
## Syntax
```{code}
#include <prio.h>
struct PRMcastRequest {
PRNetAddr mcaddr;
PRNetAddr ifaddr;
};
typedef struct PRMcastRequest PRMcastRequest;
```
### Fields
The structure has the following fields:
`mcaddr`
: IP multicast address of group.
`ifaddr`
: Local IP address of interface.
## Description
The `mcaddr` and `ifaddr` fields are of the type {ref}`PRNetAddr`, but
their `port` fields are ignored. Only the IP address (`inet.ip`)
fields are used.