xnu-1699.22.81.tar.gz

[apple/xnu.git] / bsd / sys / pipe.h

diff --git a/bsd/sys/pipe.h b/bsd/sys/pipe.h
index a13a2759828bba17953e467d1ebbbebe11cf4556..71557f0b07bb1137ce40d9d0567c28cdc026af25 100644 (file)
--- a/bsd/sys/pipe.h
+++ b/bsd/sys/pipe.h
@@ -107,7 +107,6 @@ struct pipebuf {
 /*
  * Information to support direct transfers between processes for pipes.
  */
-/* LP64todo - not 64bit safe */
 struct pipemapping {
        vm_offset_t     kva;            /* kernel virtual address */
        vm_size_t       cnt;            /* number of chars in buffer */
@@ -130,7 +129,9 @@ struct pipemapping {
 #define PIPE_LWANT     0x200   /* Process wants exclusive access to pointers/data. */
 #define PIPE_DIRECTW   0x400   /* Pipe direct write active. */
 #define PIPE_DIRECTOK  0x800   /* Direct mode ok. */
-#define PIPE_KNOTE     0x1000   /* Pipe has kernel events activated */
+#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. */
 
 #ifdef KERNEL