initial version

tvtswitch.c

@@ -0,0 +1,38 @@
+#include <sys/time.h>
+#include <dev/wscons/wsconsio.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(int argc, char *argv[])
+{
+	int fd, vtnum;
+	struct wsdisplay_addscreendata screendata;
+	struct timeval t0, t1, dt;
+
+	fd = open("/dev/ttyC0", O_RDWR);
+	if (fd < 0)
+		err(2, "open /dev/ttyC0");
+	
+	if (argc == 2) {
+		vtnum = atoi(argv[1]);
+		gettimeofday(&t0, NULL);
+		if (ioctl(fd, WSDISPLAYIO_SETSCREEN, &vtnum) < 0)
+			err(2, "SETSCREEN");
+		gettimeofday(&t1, NULL);
+		timersub(&t1, &t0, &dt);
+		printf("vt switch took %lu %ld %lf ms\n",
+		    (unsigned long)dt.tv_sec, (long)dt.tv_usec,
+		    dt.tv_usec/1000.0);
+	}
+	screendata.idx = -1;
+	if (ioctl(fd, WSDISPLAYIO_GETSCREEN, &screendata) < 0)
+		err(2, "GETSCREEN");
+	printf("Current VT: %d %s %s\n", screendata.idx,
+	    screendata.screentype, screendata.emul);
+	exit(0);
+}