aio / timers: add ppoll support with qemu_poll_ns

Add qemu_poll_ns which works like g_poll but takes a nanosecond
timeout.

Signed-off-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/qemu-timer.c b/qemu-timer.c
index be29adf9eb..120d58fb2a 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -37,6 +37,10 @@
 #include <mmsystem.h>
 #endif
 
+#ifdef CONFIG_PPOLL
+#include <poll.h>
+#endif
+
 /***********************************************************/
 /* timers */
 
@@ -323,6 +327,26 @@ int qemu_timeout_ns_to_ms(int64_t ns)
 }
 
 
+/* qemu implementation of g_poll which uses a nanosecond timeout but is
+ * otherwise identical to g_poll
+ */
+int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
+{
+#ifdef CONFIG_PPOLL
+    if (timeout < 0) {
+        return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
+    } else {
+        struct timespec ts;
+        ts.tv_sec = timeout / 1000000000LL;
+        ts.tv_nsec = timeout % 1000000000LL;
+        return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
+    }
+#else
+    return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
+#endif
+}
+
+
 QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
                           QEMUTimerCB *cb, void *opaque)
 {