Fix rc not to bus error on Mac OS X.

Don't print about child notes either.

src/cmd/rc/io.c

@@ -126,10 +126,13 @@ void flush(io *f)
 	}
 }
 io *openfd(int fd){
-	io *f=new(struct io);
+	io *f;
+fprint(2, "in openfd\n");
+	f=new(struct io);
 	f->fd=fd;
 	f->bufp=f->ebuf=f->buf;
 	f->strp=0;
+fprint(2, "in openfd\n");
 	return f;
 }
 io *openstr(void){
@@ -155,6 +158,7 @@ io *opencore(char *s, int len)
 	Memcpy(buf, s, len);
 	return f;
 }
+/*
 void rewind(io *io)
 {
 	if(io->fd==-1) io->bufp=io->strp;
@@ -163,6 +167,7 @@ void rewind(io *io)
 		Seek(io->fd, 0L, 0);
 	}
 }
+*/
 void closeio(io *io)
 {
 	if(io->fd>=0) close(io->fd);

src/cmd/rc/io.h

@@ -1,3 +1,9 @@
+/*
+ * on Mac OS X, err is something else,
+ * and assigning to it causes a bus error.
+ * what a crappy linker.
+ */
+#define err rc_err
 #define	EOF	(-1)
 #define	NBUF	512
 struct io{

src/cmd/rc/plan9ish.c

@@ -400,7 +400,7 @@ notifyf(void *unused0, char *s)
 			if(strncmp(s, "sys: ", 5)!=0) interrupted=1;
 			goto Out;
 		}
-
+	if(strcmp(s, "sys: child") != 0)
 		pfmt(err, "rc: note: %s\n", s);
 	noted(NDFLT);
 	return;