vfs: call pipe_check before reviving select()

	. select callback on close() on a pipe
	  would falsely revive a read-select on
	  the pipe
	. the extra pipe_check catches it
	. fixes the new import of the netbsd
	  make in -j N mode (make jobs that communicate
	  with pipes)

diff --git a/servers/vfs/pipe.c b/servers/vfs/pipe.c
index ce0909727068a457dedfe3c82bd4e1427bfca3f4..f9e2c6ad6ab793e3b36d083835cd8c146e6a7d9b 100644 (file)
--- a/servers/vfs/pipe.c
+++ b/servers/vfs/pipe.c
@@ -392,7 +392,16 @@ int count;                 /* max number of processes to release */
                if (f->filp_count < 1 || !(f->filp_pipe_select_ops & selop) ||
                    f->filp_vno != vp)
                        continue;
+
+               /* Do a pipe_check to see if we really want to callback this
+                * select; a close() doesn't always warrant it.
+                */
+               if(pipe_check(f, op == VFS_READ ? READING : WRITING,
+                       f->filp_flags & ~O_NONBLOCK, 1, 1) == SUSPEND) {
+                       continue;
+               }
                select_callback(f, selop);
+
                f->filp_pipe_select_ops &= ~selop;
        }
   }