devdraw/OSX: correct access to reply buffer (fixes rpc tag crash)
diff --git a/src/cmd/devdraw/osx-srv.c b/src/cmd/devdraw/osx-srv.c
index 9329bc2..10baf0f 100644
--- a/src/cmd/devdraw/osx-srv.c
+++ b/src/cmd/devdraw/osx-srv.c
@@ -289,6 +289,7 @@
/*
* Reply to m.
*/
+QLock replylock;
void
replymsg(Wsysmsg *m)
{
@@ -303,6 +304,8 @@
if(trace) fprint(2, "-> %W\n", m);
/* copy to output buffer */
n = sizeW2M(m);
+
+ qlock(&replylock);
if(n > nmbuf){
free(mbuf);
mbuf = malloc(n);
@@ -313,6 +316,7 @@
convW2M(m, mbuf, n);
if(write(4, mbuf, n) != n)
sysfatal("write: %r");
+ qunlock(&replylock);
}
/*
