ccan/io: make enum io_state namespace-safe.

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

ccan/io/backend.h

@@ -28,11 +28,10 @@ enum io_result {
 };
 
 enum io_state {
-	IO,
-	NEXT, /* eg starting, woken from idle, return from io_break. */
-	IDLE,
-	FINISHED,
-	PROCESSING /* We expect them to change this now. */
+	IO_IO,
+	IO_NEXT, /* eg starting, woken from idle, return from io_break. */
+	IO_IDLE,
+	IO_FINISHED
 };
 
 static inline enum io_state from_ioplan(struct io_plan *op)

ccan/io/io.c

@@ -58,7 +58,7 @@ struct io_conn *io_new_conn_(int fd,
 	conn->finish = finish;
 	conn->finish_arg = conn->next_arg = arg;
 	conn->pollflag = 0;
-	conn->state = NEXT;
+	conn->state = IO_NEXT;
 	conn->duplex = NULL;
 	conn->timeout = NULL;
 	if (!add_conn(conn)) {
@@ -87,7 +87,7 @@ struct io_conn *io_duplex_(struct io_conn *old,
 	conn->finish = finish;
 	conn->finish_arg = conn->next_arg = arg;
 	conn->pollflag = 0;
-	conn->state = NEXT;
+	conn->state = IO_NEXT;
 	conn->duplex = old;
 	conn->timeout = NULL;
 	if (!add_duplex(conn)) {
@@ -144,7 +144,7 @@ struct io_plan *io_write_(struct io_conn *conn, const void *data, size_t len,
 	conn->next = cb;
 	conn->next_arg = arg;
 	conn->pollflag = POLLOUT;
-	return to_ioplan(IO);
+	return to_ioplan(IO_IO);
 }
 
 static enum io_result do_read(struct io_conn *conn)
@@ -171,7 +171,7 @@ struct io_plan *io_read_(struct io_conn *conn, void *data, size_t len,
 	conn->next = cb;
 	conn->next_arg = arg;
 	conn->pollflag = POLLIN;
-	return to_ioplan(IO);
+	return to_ioplan(IO_IO);
 }
 
 static enum io_result do_read_partial(struct io_conn *conn)
@@ -195,7 +195,7 @@ struct io_plan *io_read_partial_(struct io_conn *conn, void *data, size_t *len,
 	conn->next = cb;
 	conn->next_arg = arg;
 	conn->pollflag = POLLIN;
-	return to_ioplan(IO);
+	return to_ioplan(IO_IO);
 }
 
 static enum io_result do_write_partial(struct io_conn *conn)
@@ -220,13 +220,13 @@ struct io_plan *io_write_partial_(struct io_conn *conn,
 	conn->next = cb;
 	conn->next_arg = arg;
 	conn->pollflag = POLLOUT;
-	return to_ioplan(IO);
+	return to_ioplan(IO_IO);
 }
 
 struct io_plan *io_idle(struct io_conn *conn)
 {
 	conn->pollflag = 0;
-	return to_ioplan(IDLE);
+	return to_ioplan(IO_IDLE);
 }
 
 void io_wake_(struct io_conn *conn,
@@ -234,12 +234,12 @@ void io_wake_(struct io_conn *conn,
 
 {
 	/* It might have finished, but we haven't called its finish() yet. */
-	if (conn->state == FINISHED)
+	if (conn->state == IO_FINISHED)
 		return;
-	assert(conn->state == IDLE);
+	assert(conn->state == IO_IDLE);
 	conn->next = fn;
 	conn->next_arg = arg;
-	backend_set_state(conn, to_ioplan(NEXT));
+	backend_set_state(conn, to_ioplan(IO_NEXT));
 }
 
 static struct io_plan *do_next(struct io_conn *conn)
@@ -251,7 +251,7 @@ static struct io_plan *do_next(struct io_conn *conn)
 
 struct io_plan *do_ready(struct io_conn *conn)
 {
-	assert(conn->state == IO);
+	assert(conn->state == IO_IO);
 	switch (conn->io(conn)) {
 	case RESULT_CLOSE:
 		return io_close(conn, NULL);
@@ -268,7 +268,7 @@ struct io_plan *do_ready(struct io_conn *conn)
 /* Close the connection, we're done. */
 struct io_plan *io_close(struct io_conn *conn, void *arg)
 {
-	return to_ioplan(FINISHED);
+	return to_ioplan(IO_FINISHED);
 }
 
 /* Exit the loop, returning this (non-NULL) arg. */
@@ -280,5 +280,5 @@ struct io_plan *io_break_(struct io_conn *conn, void *ret,
 	conn->next = fn;
 	conn->next_arg = arg;
 
-	return to_ioplan(NEXT);
+	return to_ioplan(IO_NEXT);
 }

ccan/io/poll.c

@@ -101,9 +101,9 @@ static void del_conn(struct io_conn *conn)
 		conn->duplex->duplex = NULL;
 	} else
 		del_fd(&conn->fd);
-	if (conn->state == FINISHED)
+	if (conn->state == IO_FINISHED)
 		num_finished--;
-	else if (conn->state == NEXT)
+	else if (conn->state == IO_NEXT)
 		num_next--;
 }
 
@@ -130,9 +130,9 @@ void backend_set_state(struct io_conn *conn, struct io_plan *plan)
 	if (pfd->events)
 		num_waiting++;
 
-	if (state == NEXT)
+	if (state == IO_NEXT)
 		num_next++;
-	else if (state == FINISHED)
+	else if (state == IO_FINISHED)
 		num_finished++;
 
 	conn->state = state;
@@ -169,11 +169,11 @@ static void finish_and_next(bool finished_only)
 			continue;
 		c = (void *)fds[i];
 		for (duplex = c->duplex; c; c = duplex, duplex = NULL) {
-			if (c->state == FINISHED) {
+			if (c->state == IO_FINISHED) {
 				del_conn(c);
 				free(c);
 				i--;
-			} else if (!finished_only && c->state == NEXT) {
+			} else if (!finished_only && c->state == IO_NEXT) {
 				backend_set_state(c, c->next(c, c->next_arg));
 				num_next--;
 			}