https://android-review.googlesource.com/102253

• permit interrupts during a write(2) loop in the cat builtin, too,
  not just in the read(2) loop – fixes inability to kill a clogged
  output cat

• kill the cat when smores finish

TODO: revisit this ⓐ in more depth, ⓑ for other functions, such as
      “hd”, and ⓒ test on AOSP as well

sh.h

@@ -169,9 +169,9 @@
 #endif
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.692 2014/07/13 11:34:29 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.693 2014/07/28 21:45:45 tg Exp $");
 #endif
-#define MKSH_VERSION "R50 2014/07/13"
+#define MKSH_VERSION "R50 2014/07/28"
 
 /* arithmetic types: C implementation */
 #if !HAVE_CAN_INTTYPES