ccan/io: use shutdown() before close.

During a debugging session, I wondered why poll() wasn't exiting
when I killed a (local) peer.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/ccan/io/poll.c b/ccan/io/poll.c
index 078de1403ff8a886db059f14b2437799bab7edf3..8f77dd42d7c888acfb5dca50aea510304592b403 100644 (file)
--- a/ccan/io/poll.c
+++ b/ccan/io/poll.c
@@ -78,6 +78,12 @@ static void del_fd(struct fd *fd)
        }
        num_fds--;
        fd->backend_info = -1;
        }
        num_fds--;
        fd->backend_info = -1;

+
+       /* Closing a local socket doesn't wake poll() because other end
+        * has them open.  See 2.6.  When should I use shutdown()?
+        * in http://www.faqs.org/faqs/unix-faq/socket/ */
+       shutdown(fd->fd, SHUT_RDWR);
+

        close(fd->fd);
 }
 
        close(fd->fd);
 }