Hi, The guest is waiting a connect from the host and then tries to read what has been sent by the host. Both Guest and Host codes look like that : main() { int sock, msgsock, rval; struct sockaddr_un server; char buf[1024]; sock = socket(AF_UNIX, SOCK_STREAM, 0); if (sock < 0) { perror("opening stream socket"); exit(1); } server.sun_family = AF_UNIX; strcpy(server.sun_path, NAME); if (bind(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un))) { perror("binding stream socket"); exit(1); } printf("Socket has name %s\n", server.sun_path); listen(sock, 5); for (;;) { msgsock = accept(sock, 0, 0); if (msgsock == -1) perror("accept"); else do { bzero(buf, sizeof(buf)); if ((rval = read(msgsock, buf, 1024)) < 0) on the host side : main(argc, argv) .... sock = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0); if (sock < 0) { perror("opening stream socket"); return(1); } server.sun_family = AF_UNIX; strcpy(server.sun_path, argv[1]); if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { close(sock); perror("connecting stream socket"); return(1); } if (write(sock, buffer, strlen(buffer)) < 0) perror("writing on stream socket"); Even if the host is not opening or sending anything I got this "already in use" error message. Regards, J.P. -----Message d'origine----- De : Martin Kletzander [mailto:mkletzan@redhat.com] Envoyé : mercredi 4 novembre 2015 16:21 À : Jean-Pierre Ribeauville Cc : libvirt-users@redhat.com Objet : Re: [libvirt-users] Retrieving datas sent by host within the Guest On Wed, Nov 04, 2015 at 02:38:43PM +0000, Jean-Pierre Ribeauville wrote:

Hi,

I' trying to read datas sent by my KVM host within the Guest. Host send these datas trough a channel UNIX type , by using AF_UNIX socket stuff.

If i try to retrive the datas by using such type of thing in the Guest :

#define NAME "/dev/virtio-ports/agent"

sock = socket(AF_UNIX, SOCK_STREAM, 0); 12 if (sock < 0) { 13 perror("opening stream socket"); 14 exit(1); 15 } 16 server.sun_family = AF_UNIX; 17 strcpy(server.sun_path, NAME); 18 if (bind(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un))) { 19 perror("binding stream socket"); 20 exit(1); 21 }

I got ""binding stream socket Address already in use" when trying to bind the socket .

shouldn't you conect() instead of bind() ? Of course, open() should write as well.

But If I use such kind of thing :

fd = open("/dev/virtio-ports/agent", O_RDWR | O_NONBLOCK); ssize_t size = read(fd, &rcv_buffer, 100); if(size >0) printf("Read length(%d) %s\n", size, rcv_buffer);

It works fine.

Is there any chance to be able to use socket stuff on Guest side or is there anything I misunderstand?

Thanks for help.

J.P.

J.P. Ribeauville

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