xenconsole: support for multiple consoles per domain

This patch adds a new command line argument to xenconsole to specify
to which console to connect to in case a domain has more than one.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

tools/console/client/main.c

@@ -71,6 +71,7 @@ static void usage(const char *program) {
 	       "Attaches to a virtual domain console\n"
 	       "\n"
 	       "  -h, --help       display this help and exit\n"
+	       "  -n, --num N      use console number N\n"
 	       , program);
 }
 
@@ -255,15 +256,17 @@ int main(int argc, char **argv)
 {
 	struct termios attr;
 	int domid;
-	char *sopt = "h";
+	char *sopt = "hn:";
 	int ch;
+	unsigned int num = 0;
 	int opt_ind=0;
 	struct option lopt[] = {
+		{ "num",     1, 0, 'n' },
 		{ "help",    0, 0, 'h' },
 		{ 0 },
 
 	};
-	char *path;
+	char *dom_path = NULL, *path = NULL;
 	int spty, xsfd;
 	struct xs_handle *xs;
 	char *end;
@@ -274,16 +277,17 @@ int main(int argc, char **argv)
 			usage(argv[0]);
 			exit(0);
 			break;
+		case 'n':
+			num = atoi(optarg);
+			break;
+		default:
+			fprintf(stderr, "Invalid argument\n");
+			fprintf(stderr, "Try `%s --help' for more information.\n", 
+					argv[0]);
+			exit(EINVAL);
 		}
 	}
 	
-	if ((argc - optind) != 1) {
-		fprintf(stderr, "Invalid number of arguments\n");
-		fprintf(stderr, "Try `%s --help' for more information.\n", 
-			argv[0]);
-		exit(EINVAL);
-	}
-	
 	domid = strtol(argv[optind], &end, 10);
 	if (end && *end) {
 		fprintf(stderr, "Invalid DOMID `%s'\n", argv[optind]);
@@ -299,13 +303,13 @@ int main(int argc, char **argv)
 
 	signal(SIGTERM, sighandler);
 
-	path = xs_get_domain_path(xs, domid);
-	if (path == NULL)
+	dom_path = xs_get_domain_path(xs, domid);
+	if (dom_path == NULL)
 		err(errno, "xs_get_domain_path()");
-	path = realloc(path, strlen(path) + strlen("/console/tty") + 1);
+	path = malloc(strlen(dom_path) + strlen("/serial/0/tty") + 3);
 	if (path == NULL)
-		err(ENOMEM, "realloc");
-	strcat(path, "/console/tty");
+		err(ENOMEM, "malloc");
+	snprintf(path, strlen(dom_path) + strlen("/serial/0/tty") + 2, "%s/serial/%d/tty", dom_path, num);
 
 	/* FIXME consoled currently does not assume domain-0 doesn't have a
 	   console which is good when we break domain-0 up.  To keep us
@@ -336,5 +340,6 @@ int main(int argc, char **argv)
 	restore_term(STDIN_FILENO, &attr);
 
 	free(path);
+	free(dom_path);
 	return 0;
  }

tools/python/xen/xm/console.py

@@ -24,8 +24,8 @@ from xen.util import utils
 
 XENCONSOLE = "xenconsole"
 
-def execConsole(domid):
-    xen.util.auxbin.execute(XENCONSOLE, [str(domid)])
+def execConsole(domid, num = 0):
+    xen.util.auxbin.execute(XENCONSOLE, [str(domid), "--num", str(num)])
 
 
 class OurXenstoreConnection:

tools/python/xen/xm/main.py

@@ -1779,12 +1779,13 @@ def xm_info(args):
                 print "%-23s:" % x[0], x[1]
 
 def xm_console(args):
-    arg_check(args, "console", 1, 2)
+    arg_check(args, "console", 1, 3)
 
+    num = 0
     quiet = False;
 
     try:
-        (options, params) = getopt.gnu_getopt(args, 'q', ['quiet'])
+        (options, params) = getopt.gnu_getopt(args, 'qn:', ['quiet', 'num'])
     except getopt.GetoptError, opterr:
         err(opterr)
         usage('console')
@@ -1792,6 +1793,8 @@ def xm_console(args):
     for (k, v) in options:
         if k in ['-q', '--quiet']:
             quiet = True
+	elif k in ['-n', '--num']:
+	    num = int(v[0])
         else:
             assert False
 
@@ -1819,7 +1822,7 @@ def xm_console(args):
         else:
             raise xmlrpclib.Fault(0, "Domain '%s' is not started" % dom)
 
-    console.execConsole(domid)
+    console.execConsole(domid, num)
 
 
 def domain_name_to_domid(domain_name):