auto-test: add virtio-console tests

This commit adds test for virtio-console functionality on new qemu and
guest kernel. Functionality for older qemu and older kernel will come
in the following commits.

Signed-off-by: Amit Shah <amit.shah@redhat.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/auto-virtserial-guest.c b/auto-virtserial-guest.c
index a5c0f57..db1814e 100644
--- a/auto-virtserial-guest.c
+++ b/auto-virtserial-guest.c
@@ -140,6 +140,23 @@ static int set_port_nonblocking(int val)
 	return 0;
 }
 
+static int spawn_console(int val)
+{
+	/* Currently only works on hvc0 */
+	int ret;
+
+	ret = vfork();
+	if (!ret) {
+		/* Child */
+		char *argv[] = { "/sbin/agetty", "/dev/hvc0", "9600", "vt100" };
+		char *envp[] = { NULL };
+
+		ret = execve("/sbin/agetty", argv, envp);
+		error(errno, errno, "execve");
+	}
+	return 0;
+}
+
 static void send_report(int cfd, int ret)
 {
 	struct guest_packet gpkt;
@@ -155,6 +172,15 @@ int main(int argc, char *argv[])
 	struct pollfd pollfd[1];
 	int ret, cfd;
 
+	/*
+	 * Just spawn a console on the default console port -
+	 * /dev/hvc0.  This helps in the case of running on new
+	 * kernel-old qemu combination or old kernel-new qemu
+	 * combination so that the console port test can be run and
+	 * the other tests will just fail.
+	 */
+	spawn_console(0);
+
 	ret = access(CONTROL_PORT, R_OK|W_OK);
 	if (ret == -1)
 		error(errno, errno, "No control port found %s", CONTROL_PORT);