The bind() call associates the datagram socket with the network settings in the sockaddr_vm structure, instead of the sockaddr_in structure.

struct sockaddr_vm my_addr = {0};
my_addr.svm_family = afVMCI;
my_addr.svm_cid = VMADDR_CID_ANY;
my_addr.svm_port = VMADDR_PORT_ANY;
if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof my_addr) == -1) {
      perror("bind");
      goto close;
}

The sockaddr_vm structure contains an element for the context ID (CID) to specify the virtual machine. For the client (connector) this is the local CID. For the server (listener), it could be any connecting virtual machine. VMADDR_CID_ANY and VMADDR_PORT_ANY are predefined so that at bind or connection time, the appropriate CID and port number are filled in from the client. VMADDR_CID_ANY is replaced with the CID of the virtual machine and VMADDR_PORT_ANY provides an ephemeral port from the nonreserved range (>= 1024).

The client (connector) can obtain its local CID by calling VMCISock_GetLocalCID().

The vSockets bind() function is the same as for a UDP datagram application.