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plan9: add -n option to force use of nsec() instead of relying on RDTSC: apparently 9front's clock may run absolutely crazy under some hypervizors

--- a/orca.man

+++ b/orca.man

@@ -18,6 +18,8 @@

 ] [

 .I -l undo_limit

 ] [

+.I -n

+] [

 .I file

 ]

 .SH DESCRIPTION

@@ -66,6 +68,11 @@

 .TP

 .B -l

 Sets the maximum number of undo steps. Default is 100.

+.TP

+.B -n

+Forces the use of

+.I nsec()

+instead of relying on RDTSC.

 .PP

 .SH KEYS

 .TP

--- a/plan9.c

+++ b/plan9.c

@@ -92,6 +92,7 @@

 static int mode = Minsert;

 static long framedev; /* frame deviation in ms */

 static char *shellcmd;

+static bool usensec;

 static Snap *snaps;

 static int numsnaps, nextsnap;

@@ -651,6 +652,9 @@

 	if (fasthz == 0) {

 		fasthz = ~0ULL;

+		xstart = nsec();

+		if (usensec)

+			return 0;

 		if ((f = open("/dev/time", OREAD)) >= 0 && (n = read(f, tmp, sizeof(tmp)-1)) > 2) {

 			tmp[n] = 0;

 			e = tmp;

@@ -665,7 +669,6 @@

 		if (fasthz == ~0ULL) {

 			fprint(2, "couldn't get fasthz, falling back to nsec()\n");

 			fprint(2, "you might want to disable aux/timesync\n");

-			xstart = nsec();

 			return 0;

 		}

 	}

@@ -1190,7 +1193,7 @@

 static void

 usage(void)

 {

-	print("usage: %s [-p] [-b bpm] [-c cursor] [-l undo_limit] [-s WxH] [-r random_seed] [-i ip_address] [-u udp_port] [-m midi_path] [file]\n", argv0);

+	print("usage: %s [-p] [-n] [-b bpm] [-c cursor] [-l undo_limit] [-s WxH] [-r random_seed] [-i ip_address] [-u udp_port] [-m midi_path] [file]\n", argv0);

 	threadexitsall("usage");

 }

@@ -1224,6 +1227,9 @@

 	ARGBEGIN{

 	case 'p':

 		pause = true;

+		break;

+	case 'n':

+		usensec = true;

 		break;

 	case 'b':

 		bpm = atoi(EARGF(usage()));