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libthread: reduce stack usage for ioprocs, open /proc/n/ctl with OCEXEC flag

--- a/sys/src/libthread/ioproc.c

+++ b/sys/src/libthread/ioproc.c

@@ -19,6 +19,15 @@

 	qunlock(io);

 }

+static int

+openprocctl(void)

+{

+	char buf[32];

+

+	snprint(buf, sizeof(buf), "/proc/%lud/ctl", (ulong)getpid());

+	return open(buf, OWRITE|OCEXEC);

+}

+

 static void

 xioproc(void *a)

 {

@@ -28,15 +37,11 @@

 	c = a;

 	if(io = mallocz(sizeof(*io), 1)){

-		char buf[128];

-

 		/*

 		 * open might fail, ignore it for programs like factotum

 		 * that don't use iointerrupt() anyway.

 		 */

-		snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());

-		io->ctl = open(buf, OWRITE);

-

+		io->ctl = openprocctl();

 		if((io->creply = chancreate(sizeof(void*), 0)) == nil){

 			if(io->ctl >= 0)

 				close(io->ctl);