ccan: update to get io fix for duplex pipes.

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

ccan/README

@@ -1,3 +1,3 @@
 CCAN imported from http://ccodearchive.net.
 
-CCAN version: init-2393-g9728f1d9
+CCAN version: init-2397-g261b1086

ccan/ccan/endian/endian.h

@@ -103,13 +103,22 @@ static inline uint64_t bswap_64(uint64_t val)
 }
 #endif
 
+/* Needed for Glibc like endiness check */
+#define	__LITTLE_ENDIAN	1234
+#define	__BIG_ENDIAN	4321
+
 /* Sanity check the defines.  We don't handle weird endianness. */
 #if !HAVE_LITTLE_ENDIAN && !HAVE_BIG_ENDIAN
 #error "Unknown endian"
 #elif HAVE_LITTLE_ENDIAN && HAVE_BIG_ENDIAN
 #error "Can't compile for both big and little endian."
+#elif HAVE_LITTLE_ENDIAN
+#define __BYTE_ORDER	__LITTLE_ENDIAN
+#elif HAVE_BIG_ENDIAN
+#define __BYTE_ORDER	__BIG_ENDIAN
 #endif
 
+
 #ifdef __CHECKER__
 /* sparse needs forcing to remove bitwise attribute from ccan/short_types */
 #define ENDIAN_CAST __attribute__((force))

ccan/ccan/io/_info

@@ -61,9 +61,10 @@
  * {
  * 	// Remove what we just wrote.
  * 	b->start += b->wlen;
+ *	b->wlen = 0;
  * 	assert(b->start <= sizeof(b->buf));
  *
- * 	// If we wrote something, wake writer.
+ * 	// If we wrote something, wake reader.
  * 	if (b->wlen != 0)
  * 		io_wake(b);
  *
@@ -114,6 +115,7 @@
  * 	io_new_conn(NULL, tochild[1], write_out, &to);
  *
  * 	// Read from child, write to stdout.
+ * 	memset(&from, 0, sizeof(from));
  * 	reader = io_new_conn(NULL, fromchild[0], read_in, &from);
  * 	io_set_finish(reader, finish, &from);
  * 	io_new_conn(NULL, STDOUT_FILENO, write_out, &from);

ccan/ccan/io/io.c

@@ -363,14 +363,20 @@ void io_wake(const void *wait)
 	backend_wake(wait);
 }
 
-/* Returns false if this has been freed. */
-static bool do_plan(struct io_conn *conn, struct io_plan *plan)
+/* Returns false if this should not be touched (eg. freed). */
+static bool do_plan(struct io_conn *conn, struct io_plan *plan,
+		    bool idle_on_epipe)
 {
 	/* We shouldn't have polled for this event if this wasn't true! */
 	assert(plan->status == IO_POLLING);
 
 	switch (plan->io(conn->fd.fd, &plan->arg)) {
 	case -1:
+		if (errno == EPIPE && idle_on_epipe) {
+			plan->status = IO_UNSET;
+			backend_new_plan(conn);
+			return false;
+		}
 		io_close(conn);
 		return false;
 	case 0:
@@ -386,11 +392,14 @@ static bool do_plan(struct io_conn *conn, struct io_plan *plan)
 void io_ready(struct io_conn *conn, int pollflags)
 {
 	if (pollflags & POLLIN)
-		if (!do_plan(conn, &conn->plan[IO_IN]))
+		if (!do_plan(conn, &conn->plan[IO_IN], false))
 			return;
 
 	if (pollflags & POLLOUT)
-		do_plan(conn, &conn->plan[IO_OUT]);
+		/* If we're writing to a closed pipe, we need to wait for
+		 * read to fail if we're duplex: we want to drain it! */
+		do_plan(conn, &conn->plan[IO_OUT],
+			conn->plan[IO_IN].status == IO_POLLING);
 }
 
 void io_do_always(struct io_conn *conn)