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Apparently SuSE 9.1's X distribution uses even bigger buffers than the standard ones. 64kB appears to be enough for a stack in that case, but let's just go nuts and make the stacks enormous, so that it takes a few more doublings of X's stack needs before we run into this problem again. The VM system should take care of not actually using most of the memory anyway.
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1 #include <u.h>

2 #include "x11-inc.h"

3 #include <libc.h>

4 #include <draw.h>

5 #include <thread.h>

6 #include <memdraw.h>

7 #include <keyboard.h>

8 #include "x11-memdraw.h"

10 void

11 closekeyboard(Keyboardctl *kc)

12 {

13 	if(kc == nil)

14 		return;

16 /*	postnote(PNPROC, kc->pid, "kill");

17 */

19 #ifdef BUG

20 	/* Drain the channel */

21 	while(?kc->c)

22 		<-kc->c;

23 #endif

25 	close(kc->ctlfd);

26 	close(kc->consfd);

27 	free(kc->file);

28 	free(kc->c);

29 	free(kc);

30 }

32 static

33 void

34 _ioproc(void *arg)

35 {

36 	int i;

37 	int fd;

38 	Keyboardctl *kc;

39 	Rune r;

40 	XEvent xevent;

42 	kc = arg;

43 	threadsetname("kbdproc");

44 	kc->pid = getpid();

45 	fd = XConnectionNumber(_x.kbdcon);

46 	XSelectInput(_x.kbdcon, _x.drawable, KeyPressMask);

47 	for(;;){

48 		XWindowEvent(_x.kbdcon, _x.drawable, KeyPressMask, &xevent);

49 		switch(xevent.type){

50 		case KeyPress:

51 			i = _xtoplan9kbd(&xevent);

52 			if(i == -1)

53 				continue;

54 			r = i;

55 			send(kc->c, &r);

56 			while((i=_xtoplan9kbd(nil)) >= 0){

57 				r = i;

58 				send(kc->c, &r);

59 			}

60 			break;

61 		}

62 	}

63 }

65 Keyboardctl*

66 initkeyboard(char *file)

67 {

68 	Keyboardctl *kc;

70 	kc = mallocz(sizeof(Keyboardctl), 1);

71 	if(kc == nil)

72 		return nil;

73 	kc->c = chancreate(sizeof(Rune), 20);

74 	chansetname(kc->c, "kbdc");

75 	proccreate(_ioproc, kc, 256*1024);

76 	return kc;

77 }