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page: dont tell rio our pid

$wsys might be from a remote system so pid will not work.

new rio errors out on mouse/cons instead.

--- a/sys/src/cmd/page.c

+++ b/sys/src/cmd/page.c

@@ -1269,7 +1269,7 @@

 void

 showext(Page *p)

 {

-	char buf[128], label[64], *argv[4];

+	char label[64], *argv[4];

 	Point ps;

 	int fd;

@@ -1289,8 +1289,7 @@

 		seek(fd, 0, 0);

 	}

 	if(rfork(RFPROC|RFMEM|RFFDG|RFNOTEG|RFNAMEG|RFNOWAIT) == 0){

-		snprint(buf, sizeof(buf), "-pid %d", getpid());

-		if(newwindow(buf) != -1){

+		if(newwindow(nil) != -1){

 			dupfds(fd, 1, 2, -1);

 			if((fd = open("/dev/label", OWRITE)) >= 0){

 				write(fd, label, strlen(label));

@@ -1504,10 +1503,8 @@

 	atexit(killcohort);

 	if(newwin > 0){

-		s = smprint("-pid %d", getpid());

-		if(newwindow(s) < 0)

+		if(newwindow(nil) < 0)

 			sysfatal("newwindow: %r");

-		free(s);

 	}

 	if(initdraw(drawerr, nil, argv0) < 0)

 		sysfatal("initdraw: %r");

-- 

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