#define PIPE_KNOTE 0x1000 /* Pipe has kernel events activated */
#define PIPE_DRAIN 0x2000 /* Waiting for I/O to drop for a close. Treated like EOF;
only separate for easier debugging. */
+#define PIPE_WSELECT 0x4000 /* Some thread has done an FWRITE select on the pipe */
+#define PIPE_DEAD 0x8000 /* Pipe is dead and needs garbage collection */
#ifdef KERNEL