From: osy <osy86@users.noreply.github.com>
macOS 11/iOS 14 added preadv/pwritev APIs. Due to weak linking, configure
will succeed with CONFIG_PREADV even when targeting a lower OS version. We
therefore need to check at run time if we can actually use these APIs.
Signed-off-by: Joelle van Dyne <j@getutm.app>
---
block/file-posix.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/block/file-posix.c b/block/file-posix.c
index cdc73b5f1d..d7482036a3 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1393,12 +1393,24 @@ static bool preadv_present = true;
static ssize_t
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
+#ifdef CONFIG_DARWIN /* preadv introduced in macOS 11 */
+ if (!__builtin_available(macOS 11, iOS 14, watchOS 7, tvOS 14, *)) {
+ preadv_present = false;
+ return -ENOSYS;
+ } else
+#endif
return preadv(fd, iov, nr_iov, offset);
}
static ssize_t
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
+#ifdef CONFIG_DARWIN /* pwritev introduced in macOS 11 */
+ if (!__builtin_available(macOS 11, iOS 14, watchOS 7, tvOS 14, *)) {
+ preadv_present = false;
+ return -ENOSYS;
+ } else
+#endif
return pwritev(fd, iov, nr_iov, offset);
}
--
2.24.3 (Apple Git-128)