ccan: update ccan to 7c38521d

- readme: remove reference to old domain and point to rustyrussell/ccan

Author: nGoline

ccan/README

@@ -1,3 +1,3 @@
-CCAN imported from http://ccodearchive.net.
+CCAN imported from https://github.com/rustyrussell/ccan.
 
-CCAN version: init-2612-ge242779f
+CCAN version: 7c38521d

ccan/ccan/io/poll.c

@@ -433,6 +433,7 @@ void *io_loop(struct timers *timers, struct timer **expired)
 
 		fairness_counter++;
 		for (size_t rotation = 0; rotation < num_fds && !io_loop_return; rotation++) {
+			socklen_t errno_len = sizeof(errno);
 			struct io_conn *c;
 			int events;
 
@@ -469,8 +470,18 @@ void *io_loop(struct timers *timers, struct timer **expired)
 				r--;
 				io_ready(c, events);
 			} else if (events & (POLLHUP|POLLNVAL|POLLERR)) {
+				/* On `connect` failure, Linux typically
+				 * returns POLLIN|POLLERR. MacOS returns either
+				 * POLLHUP|POLLERR or POLLOUT|POLLHUP depending
+				 * on version, setting the socket error to
+				 * ECONNREFUSED. */
 				r--;
-				errno = EBADF;
+				/* Get fd's specific error to find Mac's
+				 * ECONNREFUSED, among others */
+				if(getsockopt(fds[i]->fd, SOL_SOCKET, SO_ERROR,
+					      &errno, &errno_len) == -1) {
+					errno = EBADF;
+				}
 				io_close(c);
 			}
 		}

ccan/ccan/json_out/json_out.c

@@ -306,7 +306,7 @@ bool json_out_addstrn(struct json_out *jout,
 	struct json_escape *e;
 
 	if (json_escape_needed(str, len)) {
-		e = json_escape_len(NULL, str, len);
+		e = json_escape(NULL, str);
 		str = e->s;
 		len = strlen(str);
 	} else