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# ACE_SOCK_Dgram_Mcast Class Reference

Defines the member functions for the ACE socket wrapper for UDP/IP multicast. More...

`#include <SOCK_Dgram_Mcast.h>`

Inheritance diagram for ACE_SOCK_Dgram_Mcast:

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Collaboration diagram for ACE_SOCK_Dgram_Mcast:

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List of all members.

## Public Methods
| ACE_SOCK_Dgram_Mcast (void)
| ~ACE_SOCK_Dgram_Mcast (void)
| Default dtor. More...
int | subscribe (const ACE_INET_Addr &mcast_addr, int reuse_addr=1, const ACE_TCHAR *net_if=0, int protocol_family=PF_INET, int protocol=0)
int | unsubscribe (const ACE_INET_Addr &mcast_addr, const ACE_TCHAR *net_if=0, int protocol_family=PF_INET, int protocol=0)
int | unsubscribe (void)
| Unsubscribe from a multicast group. Returns -1 if the call fails. More...
ssize_t | send (const void *buf, size_t n, int flags=0) const
| Send <n> bytes in <buf>. More...
ssize_t | send (const iovec iov[], size_t n, int flags=0) const
| Send <n> <iovecs>. More...
int | set_option (int option, char optval)
void | dump (void) const
| Dump the state of an object. More...
## Public Attributes
| ACE_ALLOC_HOOK_DECLARE
| Declare the dynamic allocation hooks. More...
## Protected Methods
int | make_multicast_address (const ACE_INET_Addr &mcast_addr, const ACE_TCHAR *net_if=ACE_LIB_TEXT("le0"))
| Initialize the <multicast_address_> IP address. More...
int | make_multicast_address_i (const ACE_INET_Addr &mcast_addr, ip_mreq &multicast_address, const ACE_TCHAR *net_if=ACE_LIB_TEXT("le0"))
| Initialize a multicast address. This method factors out common code called by <make_multicast_address> and <subscribe>. More...
## Protected Attributes
ACE_INET_Addr | mcast_addr_
| A copy of the address that we use to <send> multicasts. More...
ip_mreq | mcast_request_if_
| IP address of the interface upon which we're receiving multicasts. More...
## Private Methods
int | open (const ACE_Addr &mcast_addr, int protocol_family=PF_INET, int protocol=0, int reuse_addr=0)
| Not publically visible. More...
int | open (const ACE_Addr &mcast_addr, const ACE_QoS_Params &qos_params, int protocol_family=PF_INET, int protocol=0, ACE_Protocol_Info *protocolinfo=0, ACE_SOCK_GROUP g=0, u_long flags=0, int reuse_addr=0)
| Not publically visible. More...
int | subscribe_ifs (const ACE_INET_Addr &mcast_addr, const ACE_TCHAR *net_if, int protocol_family, int protocol, int reuse_addr)
| Subscribe to the multicast interface using BSD-style semantics (no QoS). More...
int | unsubscribe_ifs (const ACE_INET_Addr &mcast_addr, const ACE_TCHAR *net_if=0, int protocol_family=PF_INET, int protocol=0)
| Unsubscribe to multicast interfaces subscribed to previously by <subscribe_ifs>. More...
ssize_t | send (const void *buf, size_t n, const ACE_Addr &addr, int flags=0) const
| Send an <n> byte <buf> to the datagram socket (uses <sendto(3)>). More...
ssize_t | send (const iovec iov[], size_t n, const ACE_Addr &addr, int flags=0) const
| Send an <iovec> of size <n> to the datagram socket (uses <sendmsg(3)>). More...

## Detailed Description

Defines the member functions for the ACE socket wrapper for UDP/IP multicast.

## Constructor & Destructor Documentation

ACE_SOCK_Dgram_Mcast::ACE_SOCK_Dgram_Mcast | ( | void |  | ) |

| Note that there is no public <open> method. Therefore, this class cannot be used unless you <subscribe> to a multicast group. If you just want to send (and not listen) to a multicast group, use <ACE_SOCK_Dgram> or <ACE_SOCK_CODgram> instead.

ASYS_INLINE ACE_SOCK_Dgram_Mcast::~ACE_SOCK_Dgram_Mcast | ( | void |  | ) |

| Default dtor.

## Member Function Documentation

void ACE_SOCK_Dgram_Mcast::dump | ( | void |  | ) | const

| Dump the state of an object. Reimplemented from ACE_SOCK_Dgram.

int ACE_SOCK_Dgram_Mcast::make_multicast_address | ( | const ACE_INET_Addr & | mcast_addr,
|  | const ACE_TCHAR * | net_if = ACE_LIB_TEXT ("le0")
| ) | `[protected]`

| Initialize the <multicast_address_> IP address.

int ACE_SOCK_Dgram_Mcast::make_multicast_address_i | ( | const ACE_INET_Addr & | mcast_addr,
|  | ip_mreq & | multicast_address,
|  | const ACE_TCHAR * | net_if = ACE_LIB_TEXT ("le0")
| ) | `[protected]`

| Initialize a multicast address. This method factors out common code called by <make_multicast_address> and <subscribe>.

int ACE_SOCK_Dgram_Mcast::open | ( | const ACE_Addr & | mcast_addr,
|  | const ACE_QoS_Params & | qos_params,
|  | int | protocol_family = PF_INET,
|  | int | protocol = 0,
|  | ACE_Protocol_Info * | protocolinfo = 0,
|  | ACE_SOCK_GROUP | g = 0,
|  | u_long | flags = 0,
|  | int | reuse_addr = 0
| ) | `[private]`

| Not publically visible.

int ACE_SOCK_Dgram_Mcast::open | ( | const ACE_Addr & | mcast_addr,
|  | int | protocol_family = PF_INET,
|  | int | protocol = 0,
|  | int | reuse_addr = 0
| ) | `[private]`

| Not publically visible. Reimplemented from ACE_SOCK_Dgram.

ASYS_INLINE ssize_t ACE_SOCK_Dgram_Mcast::send | ( | const iovec | iov[],
|  | size_t | n,
|  | const ACE_Addr & | addr,
|  | int | flags = 0
| ) | const`[private]`

| Send an <iovec> of size <n> to the datagram socket (uses <sendmsg(3)>). Reimplemented from ACE_SOCK_Dgram.

ASYS_INLINE ssize_t ACE_SOCK_Dgram_Mcast::send | ( | const void * | buf,
|  | size_t | n,
|  | const ACE_Addr & | addr,
|  | int | flags = 0
| ) | const`[private]`

| Send an <n> byte <buf> to the datagram socket (uses <sendto(3)>). Reimplemented from ACE_SOCK_Dgram.

ASYS_INLINE ssize_t ACE_SOCK_Dgram_Mcast::send | ( | const iovec | iov[],
|  | size_t | n,
|  | int | flags = 0
| ) | const

| Send <n> <iovecs>.

ASYS_INLINE ssize_t ACE_SOCK_Dgram_Mcast::send | ( | const void * | buf,
|  | size_t | n,
|  | int | flags = 0
| ) | const

| Send <n> bytes in <buf>.

ASYS_INLINE int ACE_SOCK_Dgram_Mcast::set_option | ( | int | option,
|  | char | optval
| ) |

| Set an ip option that takes a char as input, such as <IP_MULTICAST_LOOP> or <IP_MULTICAST_TTL>. This is just a more concise nice interface to a subset of possible <ACE_SOCK::set_option> calls. Returns 0 on success, -1 on failure.

int ACE_SOCK_Dgram_Mcast::subscribe | ( | const ACE_INET_Addr & | mcast_addr,
|  | int | reuse_addr = 1,
|  | const ACE_TCHAR * | net_if = 0,
|  | int | protocol_family = PF_INET,
|  | int | protocol = 0
| ) |

| This is a BSD-style method (i.e., no QoS) for joining a multicast group. The network interface device driver is instructed to accept datagrams with <mcast_addr> multicast addresses. If the socket has already been opened, <subscribe> closes the socket and opens a new socket bound to the <mcast_addr>. The <net_if> interface is hardware specific, e.g., use "netstat -i" to find whether your interface is, such as "le0" or something else. If net_if == 0, <subscribe> uses the default mcast interface. Returns: -1 if the call fails. Note that some platforms, such as pSoS, support only number, not names, for network interfaces. For these platforms, just give these numbers in alphanumeric form and <subscribe> will convert them into numbers via <ACE_OS::atoi>.

int ACE_SOCK_Dgram_Mcast::subscribe_ifs | ( | const ACE_INET_Addr & | mcast_addr,
|  | const ACE_TCHAR * | net_if,
|  | int | protocol_family,
|  | int | protocol,
|  | int | reuse_addr
| ) | `[private]`

| Subscribe to the multicast interface using BSD-style semantics (no QoS).

int ACE_SOCK_Dgram_Mcast::unsubscribe | ( | void |  | ) |

| Unsubscribe from a multicast group. Returns -1 if the call fails.

int ACE_SOCK_Dgram_Mcast::unsubscribe | ( | const ACE_INET_Addr & | mcast_addr,
|  | const ACE_TCHAR * | net_if = 0,
|  | int | protocol_family = PF_INET,
|  | int | protocol = 0
| ) |

| Leave a multicast group identified by <mcast_addr>. The <net_if> interface is hardware specific. Use something like "netstat -i" to find whether your interface is, such as "le0" or something else. If <net_if> == 0, <subscribe> uses the default mcast interface. Returns: -1 if the call fails. Note that some platforms, such as pSoS, support only number, not names, for network interfaces. For these platforms, just give these numbers in alphanumeric form and <subscribe> will convert them into numbers via <ACE_OS::atoi>.

int ACE_SOCK_Dgram_Mcast::unsubscribe_ifs | ( | const ACE_INET_Addr & | mcast_addr,
|  | const ACE_TCHAR * | net_if = 0,
|  | int | protocol_family = PF_INET,
|  | int | protocol = 0
| ) | `[private]`

| Unsubscribe to multicast interfaces subscribed to previously by <subscribe_ifs>.

## Member Data Documentation

ACE_SOCK_Dgram_Mcast::ACE_ALLOC_HOOK_DECLARE

| Declare the dynamic allocation hooks. Reimplemented from ACE_SOCK_Dgram.

ACE_INET_Addr ACE_SOCK_Dgram_Mcast::mcast_addr_`[protected]`

| A copy of the address that we use to <send> multicasts.

ip_mreq ACE_SOCK_Dgram_Mcast::mcast_request_if_`[protected]`

| IP address of the interface upon which we're receiving multicasts.

The documentation for this class was generated from the following files:

- SOCK_Dgram_Mcast.h
- SOCK_Dgram_Mcast.cpp
- SOCK_Dgram_Mcast.i