[PATCH 6/9] libxl: event tests: Provide libxl_test_fdevent

[Ian Jackson <ian.jackson@eu.citrix.com>]

We are going to use this shortly.  But, it is nicely self-contained.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
---
 tools/libxl/Makefile             |    2 +-
 tools/libxl/libxl_test_fdevent.c |   79 ++++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl_test_fdevent.h |   12 ++++++
 3 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 tools/libxl/libxl_test_fdevent.c
 create mode 100644 tools/libxl/libxl_test_fdevent.h

diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 512b0e1..b92809c 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -101,7 +101,7 @@ LIBXL_OBJS += _libxl_types.o libxl_flask.o _libxl_types_internal.o
 
 LIBXL_TESTS += timedereg
 LIBXL_TESTS_PROGS = $(LIBXL_TESTS)
-LIBXL_TESTS_INSIDE = $(LIBXL_TESTS)
+LIBXL_TESTS_INSIDE = $(LIBXL_TESTS) fdevent
 
 # Each entry FOO in LIBXL_TESTS has two main .c files:
 #   libxl_test_FOO.c  "inside libxl" code to support the test case
diff --git a/tools/libxl/libxl_test_fdevent.c b/tools/libxl/libxl_test_fdevent.c
new file mode 100644
index 0000000..2d875d9
--- /dev/null
+++ b/tools/libxl/libxl_test_fdevent.c
@@ -0,0 +1,79 @@
+/*
+ * fdevent test helpr for the libxl event system
+ */
+
+#include "libxl_internal.h"
+
+#include "libxl_test_fdevent.h"
+
+typedef struct {
+    libxl__ao *ao;
+    libxl__ev_fd fd;
+    libxl__ao_abortable abrt;
+} libxl__test_fdevent;
+
+static void fdevent_complete(libxl__egc *egc, libxl__test_fdevent *tfe,
+                             int rc);
+
+static void tfe_init(libxl__test_fdevent *tfe, libxl__ao *ao)
+{
+    tfe->ao = ao;
+    libxl__ev_fd_init(&tfe->fd);
+    libxl__ao_abortable_init(&tfe->abrt);
+}
+
+static void tfe_cleanup(libxl__gc *gc, libxl__test_fdevent *tfe)
+{
+    libxl__ev_fd_deregister(gc, &tfe->fd);
+    libxl__ao_abortable_deregister(&tfe->abrt);
+}
+
+static void tfe_fd_cb(libxl__egc *egc, libxl__ev_fd *ev,
+                      int fd, short events, short revents)
+{
+    libxl__test_fdevent *tfe = CONTAINER_OF(ev,*tfe,fd);
+    STATE_AO_GC(tfe->ao);
+    fdevent_complete(egc, tfe, 0);
+}
+
+static void tfe_abrt_cb(libxl__egc *egc, libxl__ao_abortable *abrt,
+                        int rc)
+{
+    libxl__test_fdevent *tfe = CONTAINER_OF(abrt,*tfe,abrt);
+    STATE_AO_GC(tfe->ao);
+    fdevent_complete(egc, tfe, rc);
+}
+
+static void fdevent_complete(libxl__egc *egc, libxl__test_fdevent *tfe,
+                             int rc)
+{
+    STATE_AO_GC(tfe->ao);
+    tfe_cleanup(gc, tfe);
+    libxl__ao_complete(egc, ao, rc);
+}
+
+int libxl_test_fdevent(libxl_ctx *ctx, int fd, short events,
+                       libxl_asyncop_how *ao_how)
+{
+    int rc;
+    libxl__test_fdevent *tfe;
+
+    AO_CREATE(ctx, 0, ao_how);
+    GCNEW(tfe);
+
+    tfe_init(tfe, ao);
+
+    rc = libxl__ev_fd_register(gc, &tfe->fd, tfe_fd_cb, fd, events);
+    if (rc) goto out;
+
+    tfe->abrt.ao = ao;
+    tfe->abrt.callback = tfe_abrt_cb;
+    rc = libxl__ao_abortable_register(&tfe->abrt);
+    if (rc) goto out;
+
+    return AO_INPROGRESS;
+
+ out:
+    tfe_cleanup(gc, tfe);
+    return AO_CREATE_FAIL(rc);
+}
diff --git a/tools/libxl/libxl_test_fdevent.h b/tools/libxl/libxl_test_fdevent.h
new file mode 100644
index 0000000..82a307e
--- /dev/null
+++ b/tools/libxl/libxl_test_fdevent.h
@@ -0,0 +1,12 @@
+#ifndef TEST_FDEVENT_H
+#define TEST_FDEVENT_H
+
+#include <pthread.h>
+
+int libxl_test_fdevent(libxl_ctx *ctx, int fd, short events,
+                       libxl_asyncop_how *ao_how)
+                       LIBXL_EXTERNAL_CALLERS_ONLY;
+/* This operation waits for one of the poll events to occur on fd, and
+ * then completes successfully.  (Or, it can be aborted.) */
+
+#endif /*TEST_FDEVENT_H*/
-- 
1.7.10.4