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Hi, I’m trying to use unix-type channel to send/receive datas between host and guest . Here are the steps I follow : 1) Adding these lines to expose a channel unix type to my guest <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/omnivision_1.agent'/> <target type='virtio' name='org.qemu.guest_agent.0'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> 2) the VM_Orion-1 Guest, exposing a channel "unix" omnivision_1.agent is started, then netstat shows these new things : netstat -apn | grep qemu unix 2 [ ACC ] STREAM LISTENING 37214 19124/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor unix 2 [ ACC ] STREAM LISTENING 37219 19124/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 37242 19124/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 37240 19124/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor 3) I start , on the host , a simple test in order to send datas to the guest: ..... sock = socket(AF_UNIX, SOCK_STREAM, 0); if (sock < 0) { perror("opening stream socket"); return(1); } server.sun_family = AF_UNIX; strcpy(server.sun_path, argv[1]); printf("connecting to socket number : %d \n",sock); fflush(stdout); if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { close(sock); perror("connecting stream socket"); return(1); } printf("writing data on stream socket"); if (write(sock, DATA, sizeof(DATA)) < 0) perror("writing on stream socket"); close(sock); ..... 4) invoking > test "/var/lib/libvirt/qemu/omnivision_1.agent" then I got : connecting to socket number : 3 writing data on stream socket and following netstat result : netstat -apn | grep qemu unix 2 [ ACC ] STREAM LISTENING 39348 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor unix 2 [ ACC ] STREAM LISTENING 39353 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 2 [ ] STREAM CONNECTING 0 - /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39375 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39373 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor 5) if I try to re-invoke test "/var/lib/libvirt/qemu/omnivision_1.agent" then : netstat -apn | grep qemu tcp 0 0 127.0.0.1:5902 0.0.0.0:* LISTEN 20587/qemu-kvm tcp 0 0 127.0.0.1:5902 127.0.0.1:57772 ESTABLISHED 20587/qemu-kvm unix 2 [ ACC ] STREAM LISTENING 39348 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor unix 2 [ ACC ] STREAM LISTENING 39353 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 2 [ ] STREAM CONNECTING 0 - /var/lib/libvirt/qemu/omnivision_1.agent unix 2 [ ] STREAM CONNECTING 0 - /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39375 20587/qemu-kvm /var/lib/libvirt/qemu/omnivision_1.agent unix 3 [ ] STREAM CONNECTED 39373 20587/qemu-kvm /var/lib/libvirt/qemu/VM_Orion-1.monitor on the guest side , I try to retrieve datas sent by host , by using this kind of thing : ... int fd = open("/dev/virtio-ports/org.qemu.guest_agent.0", O_RDWR | O_NONBLOCK); ssize_t size = read(fd, &buffer, 100); ... As you can imagine , I never receive any data from the host . Is it the right way to use this “unix-type” channel ? Thx for your patience. Regards,
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