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page: avoid intermediate rc shell processes with using exec, move newwindow() before forking namespace

use exec to avoid intermediate rc processes.

avoid capturing old namespace in the waiting process by doing the
newwindow() call before it.

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

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

@@ -299,10 +299,9 @@

 	if(p->data){

 		p->ext = p->data;

 		if(strcmp(p->ext, "ico") == 0)

-			snprint(nam, sizeof(nam), "%s -c", p->ext);

+			pipeline(fd, "exec %s -c", p->ext);

 		else

-			snprint(nam, sizeof(nam), "%s -t9", p->ext);

-		pipeline(fd, "%s", nam);

+			pipeline(fd, "exec %s -t9", p->ext);

 	}

 	/*

@@ -325,7 +324,7 @@

 {

 	seek(p->fd, 0, 0);

 	if(p->data){

-		pipeline(p->fd, "%s", (char*)p->data);

+		pipeline(p->fd, "exec %s", (char*)p->data);

 		p->data = nil;

 	}

 	p->open = popenfile;

@@ -339,7 +338,7 @@

 	seek(p->fd, 0, 0);

 	snprint(mnt, sizeof(mnt), "/n/tapefs.%.12d%.8lux", getpid(), (ulong)p);

-	snprint(cmd, sizeof(cmd), "%s -m %s /fd/0", (char*)p->data, mnt);

+	snprint(cmd, sizeof(cmd), "exec %s -m %s /fd/0", (char*)p->data, mnt);

 	switch(rfork(RFPROC|RFMEM|RFFDG|RFREND)){

 	case -1:

 		close(p->fd);

@@ -812,11 +811,11 @@

 		p->open = nil;

 	else {

 		if(rotate)

-			pipeline(fd, "rotate -r %d", rotate);

+			pipeline(fd, "exec rotate -r %d", rotate);

 		if(resize.x)

-			pipeline(fd, "resize -x %d", resize.x);

+			pipeline(fd, "exec resize -x %d", resize.x);

 		else if(resize.y)

-			pipeline(fd, "resize -y %d", resize.y);

+			pipeline(fd, "exec resize -y %d", resize.y);

 	}

 	return fd;

 }

@@ -1489,6 +1488,11 @@

 		usage();

 	} ARGEND;

+	if(newwin > 0){

+		if(newwindow(nil) < 0)

+			sysfatal("newwindow: %r");

+	}

+

 	/*

 	 * so that we can stop all subprocesses with a note,

 	 * and to isolate rendezvous from other processes

@@ -1501,11 +1505,6 @@

 	}

 	cohort = getpid();

 	atexit(killcohort);

-

-	if(newwin > 0){

-		if(newwindow(nil) < 0)

-			sysfatal("newwindow: %r");

-	}

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

 		sysfatal("initdraw: %r");

 	paper = display->white;

-- 

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