[PATCH 7/9] libxl: event tests: Provide miniature poll machinery

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

This allows a test case to have a poll-based event loop with exact
control of the sequence of operations.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
---
 tools/libxl/test_common.c |   44 +++++++++++++++++++++++++++++++++++++++++++-
 tools/libxl/test_common.h |   15 +++++++++++++++
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/test_common.c b/tools/libxl/test_common.c
index 83b94eb..c6bbbab 100644
--- a/tools/libxl/test_common.c
+++ b/tools/libxl/test_common.c
@@ -12,4 +12,46 @@ void test_common_setup(int level)
 
     int rc = libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0, logger);
     assert(!rc);
-}    
+}
+
+struct timeval now;
+
+void test_common_get_now(void)
+{
+    int r = gettimeofday(&now, 0);  assert(!r);
+}
+
+int poll_nfds, poll_nfds_allocd;
+struct pollfd *poll_fds;
+int poll_timeout;
+
+void test_common_beforepoll(void)
+{
+    for (;;) {
+        test_common_get_now();
+
+        poll_timeout = -1;
+        poll_nfds = poll_nfds_allocd;
+        int rc = libxl_osevent_beforepoll(ctx, &poll_nfds, poll_fds,
+                                          &poll_timeout, now);
+        if (!rc) return;
+        assert(rc == ERROR_BUFFERFULL);
+
+        assert(poll_nfds > poll_nfds_allocd);
+        poll_fds = realloc(poll_fds, poll_nfds * sizeof(poll_fds[0]));
+        assert(poll_fds);
+        poll_nfds_allocd = poll_nfds;
+    }
+}
+
+void test_common_dopoll(void) {
+    errno = 0;
+    int r = poll(poll_fds, poll_nfds, poll_timeout);
+    fprintf(stderr, "poll: r=%d errno=%s\n", r, strerror(errno));
+}
+
+void test_common_afterpoll(void)
+{
+    test_common_get_now();
+    libxl_osevent_afterpoll(ctx, poll_nfds, poll_fds, now);
+}
diff --git a/tools/libxl/test_common.h b/tools/libxl/test_common.h
index 8b2471e..10c7166 100644
--- a/tools/libxl/test_common.h
+++ b/tools/libxl/test_common.h
@@ -6,9 +6,24 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 
 void test_common_setup(int level);
 
 extern libxl_ctx *ctx;
 
+void test_common_get_now(void);
+
+extern struct timeval now;
+
+void test_common_beforepoll(void);
+void test_common_dopoll(void);
+void test_common_afterpoll(void);
+
+extern int poll_nfds, poll_nfds_allocd;
+extern struct pollfd *poll_fds;
+extern int poll_timeout;
+
 #endif /*TEST_COMMON_H*/
-- 
1.7.10.4