io: fix nasty io_wake corner case.

[ccan] / ccan / io / test / run-40-wakeup-mutual.c

diff --git a/ccan/io/test/run-40-wakeup-mutual.c b/ccan/io/test/run-40-wakeup-mutual.c
new file mode 100644 (file)
index 0000000..04ec944
--- /dev/null
+++ b/ccan/io/test/run-40-wakeup-mutual.c
@@ -0,0 +1,54 @@
+/* Test previous issue: in duplex case, we wake reader reader wakes writer. */
+#include <ccan/io/io.h>
+/* Include the C files directly. */
+#include <ccan/io/poll.c>
+#include <ccan/io/io.c>
+#include <ccan/tap/tap.h>
+#include <sys/wait.h>
+#include <stdio.h>
+
+static struct io_plan *block_reading(struct io_conn *conn, void *unused)
+{
+       static char buf[1];
+       return io_read(conn, buf, sizeof(buf), io_never, NULL);
+}
+
+static struct io_plan *writer_woken(struct io_conn *conn, void *unused)
+{
+       pass("Writer woken up");
+       return io_write(conn, "1", 1, io_close_cb, NULL);
+}
+
+static struct io_plan *reader_woken(struct io_conn *conn, void *unused)
+{
+       pass("Reader woken up");
+       /* Wake writer */
+       io_wake(conn);
+       return block_reading(conn, unused);
+}
+
+static struct io_plan *setup_conn(struct io_conn *conn, void *trigger)
+{
+       return io_duplex(conn,
+                        io_wait(conn, trigger, reader_woken, NULL),
+                        io_out_wait(conn, conn, writer_woken, NULL));
+}
+
+int main(void)
+{
+       int fds[2];
+       
+       plan_tests(3);
+       ok1(socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) == 0);
+
+       /* We use 'fds' as pointer to wake writer. */
+       io_new_conn(NULL, fds[0], setup_conn, fds);
+
+       io_wake(fds);
+       io_loop(NULL, NULL);
+
+       close(fds[1]);
+
+       /* This exits depending on whether all tests passed */
+       return exit_status();
+}