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usbd: improved event file

--- a/sys/src/cmd/nusb/usbd/hub.c

+++ b/sys/src/cmd/nusb/usbd/hub.c

@@ -5,7 +5,7 @@

 #include "dat.h"

 #include "fns.h"

-static Hub *hubs;

+Hub *hubs;

 static int nhubs;

 static int mustdump;

 static int pollms = Pollms;

--- a/sys/src/cmd/nusb/usbd/usbd.c

+++ b/sys/src/cmd/nusb/usbd/usbd.c

@@ -26,10 +26,10 @@

 	char *data;

 	int len;

 	Event *link;

-	int ref;

+	int ref, prev;

 };

-static Event *evfirst, *evlast;

+static Event *evlast;

 static Req *reqfirst, *reqlast;

 static QLock evlock;

@@ -59,10 +59,7 @@

 static void

 initevent(void)

 {

-	evfirst = mallocz(sizeof(*evfirst), 1);

-	if(evfirst == nil)

-		sysfatal("malloc: %r");

-	evlast = evfirst;

+	evlast = mallocz(sizeof(Event), 1);

 }

 static void

@@ -80,8 +77,8 @@

 	fulfill(req, e);

 	req->fid->aux = e->link;

 	e->link->ref++;

-	if(--e->ref == 0 && e == evfirst){

-		evfirst = e->link;

+	if(--e->ref == 0 && e->prev == 0){

+		e->link->prev--;

 		free(e->data);

 		free(e);

 	}

@@ -104,6 +101,7 @@

 	e->data = data;

 	e->len = strlen(data);

 	e->link = ee;

+	ee->prev++;

 	for(r = reqfirst; r != nil; r = rr){

 		rr = r->aux;

 		r->aux = nil;

@@ -113,8 +111,8 @@

 		fulfill(r, e);

 		respond(r, nil);

 	}

-	if(e->ref == 0 && e == evfirst){

-		evfirst = ee;

+	if(e->ref == 0 && e->prev == 0){

+		ee->prev--;

 		free(e->data);

 		free(e);

 	}

@@ -199,13 +197,50 @@

 		respond(req, nil);

 }

+static char *

+formatdev(Dev *d)

+{

+	Usbdev *u;

+	

+	u = d->usb;

+	return smprint("in id %d vid 0x%.4x did 0x%.4x csp 0x%.8lx\n",

+		d->id, u->vid, u->did, u->csp);

+}

+

 static void

+enumerate(Event **l)

+{

+	Event *e;

+	Hub *h;

+	Port *p;

+	extern Hub *hubs;

+	

+	for(h = hubs; h != nil; h = h->next){

+		for(p = h->port; p < h->port + h->nport; p++){

+			if(p->dev == nil || p->dev->usb == nil || p->hub != nil)

+				continue;

+			e = mallocz(sizeof(Event), 1);

+			if(e == nil)

+				sysfatal("malloc: %r");

+			e->data = formatdev(p->dev);

+			e->len = strlen(e->data);

+			e->prev = 1;

+			*l = e;

+			l = &e->link;

+		}

+	}

+	*l = evlast;

+	evlast->prev++;

+}

+

+static void

 usbdopen(Req *req)

 {

 	if(req->fid->qid.path == Qusbevent){

 		qlock(&evlock);

-		req->fid->aux = evlast;

-		evlast->ref++;

+		enumerate(&req->fid->aux);

+		((Event *)req->fid->aux)->ref++;

+		((Event *)req->fid->aux)->prev--;

 		qunlock(&evlock);

 	}

 	respond(req, nil);

@@ -219,14 +254,14 @@

 	if(fid->qid.path == Qusbevent){

 		qlock(&evlock);

 		e = fid->aux;

-		if(--e->ref == 0 && e == evfirst){

-			while(e->ref == 0 && e != evlast){

+		if(--e->ref == 0 && e->prev == 0){

+			while(e->ref == 0 && e->prev == 0 && e != evlast){

 				ee = e->link;

+				ee->prev--;

 				free(e->data);

 				free(e);

 				e = ee;

 			}

-			evfirst = e;

 		}

 		qunlock(&evlock);

 	}

@@ -264,15 +299,12 @@

 startdev(Port *p)

 {

 	Dev *d;

-	Usbdev *u;

-	if((d = p->dev) == nil || (u = p->dev->usb) == nil){

+	if((d = p->dev) == nil || p->dev->usb == nil){

 		fprint(2, "okay what?\n");

 		return -1;

 	}

-	pushevent(smprint("in id %d vid 0x%.4x did 0x%.4x csp 0x%.8x\n",

-		d->id, u->vid, u->did, u->csp));

-	closedev(p->dev);

+	pushevent(formatdev(d));

 	return 0;

 }

-- 

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