On Tuesday, June 20, 2000 at 12:30:00 PM UTC+5:30, Bob DeJoie wrote:

On Mon, 19 Jun 2000 15:57:58 GMT, "Øyvind Holmeide" <oeyvind.holmeide@no.abb.com> wrote:

I am trying to use UDP multicast in VxWorks without success. I have used >the sample code from WindRiver, see below, but the sendto() command fails >with errno = 0x41. Any hints?

<snip>

/* sin.sa_len = (u_char) sizeof(sin); */
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(0);

if (bind(sockDesc, (struct sockaddr *)&sin, sizeof(sin)) != 0)

perror("bind");
if (sockDesc)
close (sockDesc);
return (ERROR);
}

At this point in my initialization I configure the interface for
multicast, with somethin like :
setsockopt(send_socket,
IPPROTO_IP,
IP_MULTICAST_IF,
(char *)&sin.sin_addr.s_addr,
sizeof(sin.sin_addr.s_addr));
Then set TTL if there are any routers in that the message must
go through.
I am using 5.3.1 with the SENS and SENS upgrade patches applied.

toAddrLen = sizeof(struct sockaddr_in);
/* toAddr.sa_len = (u_char) toAddrLen; */
toAddr.sin_family = AF_INET;

/* initialize the address to the send */
toAddr.sin_addr.s_addr = inet_addr (mcastAddr);

/* initialize the port to send */
toAddr.sin_port = htons(mcastPort);

bufPtr = sendBuf; /* initialize the buffer pointer */

/* send the buffer */
while (sendLen > 0)

if ((len = sendto (sockDesc, bufPtr, sendLen, 0,
(struct sockaddr *)&toAddr, toAddrLen)) < 0 )

printf("mcastSend sendto errno:0x%x\n", errno );
break;
}

sendLen -= len;
bufPtr += len;

taskDelay (1); /* give a taskDelay */
}

if (sockDesc != ERROR)
close (sockDesc);

return (OK);
}

================================================
Bob DeJoie
Kwajalein Missile Range
Republic of the Marshall Islands
email: rjdejoie@kmrmail.kmr.ll.mit.edu
phone: 805-355-5855 fax: 805-355-3833
Time Zone: GMT +12 hours ================================================

Dear All,

Can someone provide working code for Multicast receiver and sender for Vxworks 6.5.3 and 6.9
I am unable to receive the multicast response after binding.
After so many failed attempts unable to receive the data.

Current code link "https://pastebin.com/embed_js/KTn17YG2"
This code is working in ubuntu, but in vxworks after binding not able to receive packets.
Do I need to configure in L3 switch?

Thanks...

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