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block: check availablity for preadv/pwritev on mac

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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.
This commit is contained in:
Joelle van Dyne
2020-09-14 15:06:29 -07:00
parent c17f7d3b39
commit f8be906d32
1 changed files with 33 additions and 0 deletions
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block/file-posix.c
+33
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@@ -1390,17 +1390,50 @@ static int handle_aiocb_flush(void *opaque)
#ifdef CONFIG_PREADV
static bool preadv_present = true;
static bool preadv_checked;
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 (unlikely(!preadv_checked)) {
if (__builtin_available(macOS 11, iOS 14, watchOS 7, tvOS 14, *)) {
preadv_checked = true;
} else {
preadv_present = false;
return -ENOSYS;
}
}
/* Now we suppress the availability warning since we use the cached check */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability-new"
return preadv(fd, iov, nr_iov, offset);
#pragma clang diagnostic pop
#else /* CONFIG_DARWIN */
return preadv(fd, iov, nr_iov, offset);
#endif
}
static ssize_t
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset)
{
#ifdef CONFIG_DARWIN /* preadv introduced in macOS 11 */
if (unlikely(!preadv_checked)) {
if (__builtin_available(macOS 11, iOS 14, watchOS 7, tvOS 14, *)) {
preadv_checked = true;
} else {
preadv_present = false;
return -ENOSYS;
}
}
/* Now we suppress the availability warning since we use the cached check */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability-new"
return pwritev(fd, iov, nr_iov, offset);
#pragma clang diagnostic pop
#else /* CONFIG_DARWIN */
return pwritev(fd, iov, nr_iov, offset);
#endif
}
#else