ccan/io: test read after hangup.

In particular, make sure that idle connections don't get closed.

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

diff --git a/ccan/io/poll.c b/ccan/io/poll.c
index 9f9bb4a256168699eecec1dc062855475766e899..7f3df7ed301728965cbc2fc203f0bcc46262ec11 100644 (file)
--- a/ccan/io/poll.c
+++ b/ccan/io/poll.c
@@ -31,8 +31,12 @@ static bool add_fd(struct fd *fd, short events)
                max_fds = num;
        }
 
-       pollfds[num_fds].fd = fd->fd;
        pollfds[num_fds].events = events;
+       /* In case it's idle. */
+       if (!events)
+               pollfds[num_fds].fd = -fd->fd;
+       else
+               pollfds[num_fds].fd = fd->fd;
        pollfds[num_fds].revents = 0; /* In case we're iterating now */
        fds[num_fds] = fd;
        fd->backend_info = num_fds;
@@ -91,8 +95,11 @@ void backend_plan_changed(struct io_conn *conn)
                assert(!mask || pfd->events != mask);
                pfd->events |= mask;
        }
-       if (pfd->events)
+       if (pfd->events) {
                num_waiting++;
+               pfd->fd = conn->fd.fd;
+       } else
+               pfd->fd = -conn->fd.fd;
 
        if (!conn->plan.next)
                num_closing++;

diff --git a/ccan/io/test/run-08-hangup-on-idle.c b/ccan/io/test/run-08-hangup-on-idle.c
new file mode 100644 (file)
index 0000000..364d794
--- /dev/null
+++ b/ccan/io/test/run-08-hangup-on-idle.c
@@ -0,0 +1,45 @@
+#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 int fds2[2];
+
+static struct io_plan timeout_wakeup(struct io_conn *conn, char *buf)
+{
+       /* This kills the dummy connection. */
+       close(fds2[1]);
+       return io_read(buf, 16, io_close, NULL);
+}
+
+int main(void)
+{
+       int fds[2];
+       struct io_conn *conn;
+       char buf[16];
+
+       plan_tests(4);
+
+       ok1(pipe(fds) == 0);
+
+       /* Write then close. */
+       io_new_conn(fds[1], io_write("hello there world", 16, io_close, NULL),
+                   NULL, NULL);
+       conn = io_new_conn(fds[0], io_idle(), NULL, NULL);
+
+       /* To avoid assert(num_waiting) */
+       ok1(pipe(fds2) == 0);
+       io_new_conn(fds2[0], io_read(buf, 16, io_close, NULL), NULL, NULL);
+
+       /* After half a second, it will read. */
+       io_timeout(conn, time_from_msec(500), timeout_wakeup, buf);
+
+       ok1(io_loop() == NULL);
+       ok1(memcmp(buf, "hello there world", 16) == 0);
+
+       /* This exits depending on whether all tests passed */
+       return exit_status();
+}

diff --git a/ccan/io/test/run-08-read-after-hangup.c b/ccan/io/test/run-08-read-after-hangup.c
new file mode 100644 (file)
index 0000000..95eb651
--- /dev/null
+++ b/ccan/io/test/run-08-read-after-hangup.c
@@ -0,0 +1,35 @@
+#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>
+#include <signal.h>
+
+static char inbuf[8];
+
+static struct io_plan wake_it(struct io_conn *conn, struct io_conn *reader)
+{
+       io_wake(reader, io_read(inbuf, 8, io_close, NULL));
+       return io_close(conn, NULL);
+}
+
+int main(void)
+{
+       int fds[2];
+       struct io_conn *conn;
+
+       plan_tests(3);
+
+       ok1(pipe(fds) == 0);
+       conn = io_new_conn(fds[0], io_idle(), NULL, NULL);
+       io_new_conn(fds[1], io_write("EASYTEST", 8, wake_it, conn),
+                   NULL, NULL);
+
+       ok1(io_loop() == NULL);
+       ok1(memcmp(inbuf, "EASYTEST", sizeof(inbuf)) == 0);
+
+       /* This exits depending on whether all tests passed */
+       return exit_status();
+}