Signed-off-by: Fam Zheng <[email protected]>
---
poll-glib.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/poll-glib.c b/poll-glib.c
index 64fde69..23d528d 100644
--- a/poll-glib.c
+++ b/poll-glib.c
@@ -14,6 +14,9 @@
#include "qemu-common.h"
#include "qemu/timer.h"
#include "qemu/poll.h"
+#if CONFIG_PPOLL
+#include <poll.h>
+#endif
struct QEMUPoll {
/* Array of GPollFD for g_poll() */
@@ -42,13 +45,33 @@ void qemu_poll_free(QEMUPoll *qpoll)
int qemu_poll(QEMUPoll *qpoll, int64_t timeout_ns)
{
int i;
+ void *fds = qpoll->gpollfds->data;
+ int nfds = qpoll->gpollfds->len;
+
for (i = 0; i < qpoll->gpollfds->len; i++) {
GPollFD *p = &g_array_index(qpoll->gpollfds, GPollFD, i);
p->revents = 0;
}
- return g_poll((GPollFD *)qpoll->gpollfds->data,
- qpoll->gpollfds->len,
- qemu_timeout_ns_to_ms(timeout_ns));
+#if CONFIG_PPOLL
+ if (timeout_ns < 0) {
+ return ppoll(fds, nfds, NULL, NULL);
+ } else {
+ struct timespec ts;
+ int64_t tvsec = timeout_ns / 1000000000LL;
+ /* Avoid possibly overflowing and specifying a negative number of
+ * seconds, which would turn a very long timeout into a busy-wait.
+ */
+ if (tvsec > (int64_t)INT32_MAX) {
+ tvsec = INT32_MAX;
+ }
+ ts.tv_sec = tvsec;
+ ts.tv_nsec = timeout_ns % 1000000000LL;
+ return ppoll(fds, nfds, &ts, NULL);
+ }
+
+#else
+ return g_poll(data, nfds, qemu_timeout_ns_to_ms(timeout_ns));
+#endif
}
/* Add an fd to poll. Return -EEXIST if fd already registered. */
--
1.9.3
