int32_t SystemNative_Poll(PollEvent* pollEvents, uint32_t eventCount, int32_t milliseconds, uint32_t* triggered)
{
if (pollEvents == NULL || triggered == NULL)
{
return Error_EFAULT;
}
if (milliseconds < -1)
{
return Error_EINVAL;
}
size_t bufferSize;
if (!multiply_s(sizeof(struct pollfd), (size_t)eventCount, &bufferSize))
{
return SystemNative_ConvertErrorPlatformToPal(EOVERFLOW);
}
int useStackBuffer = bufferSize <= 2048;
struct pollfd* pollfds = (struct pollfd*)(useStackBuffer ? alloca(bufferSize) : malloc(bufferSize));
if (pollfds == NULL)
{
return Error_ENOMEM;
}
for (uint32_t i = 0; i < eventCount; i++)
{
const PollEvent* event = &pollEvents[i];
pollfds[i].fd = event->FileDescriptor;
// we need to do this for platforms like AIX where PAL_POLL* doesn't
// match up to their reality; this is PollEvent -> system polling
switch (event->Events)
{
case PAL_POLLIN:
pollfds[i].events = POLLIN;
break;
case PAL_POLLPRI:
pollfds[i].events = POLLPRI;
break;
case PAL_POLLOUT:
pollfds[i].events = POLLOUT;
break;
case PAL_POLLERR:
pollfds[i].events = POLLERR;
break;
case PAL_POLLHUP:
pollfds[i].events = POLLHUP;
break;
case PAL_POLLNVAL:
pollfds[i].events = POLLNVAL;
break;
default:
pollfds[i].events = event->Events;
break;
}
pollfds[i].revents = 0;
}
int rv;
while ((rv = poll(pollfds, (nfds_t)eventCount, milliseconds)) < 0 && errno == EINTR);
if (rv < 0)
{
if (!useStackBuffer)
{
free(pollfds);
}
*triggered = 0;
return SystemNative_ConvertErrorPlatformToPal(errno);
}
for (uint32_t i = 0; i < eventCount; i++)
{
const struct pollfd* pfd = &pollfds[i];
assert(pfd->fd == pollEvents[i].FileDescriptor);
assert(pfd->events == pollEvents[i].Events);
// same as the other switch, just system -> PollEvent
switch (pfd->revents)
{
case POLLIN:
pollEvents[i].TriggeredEvents = PAL_POLLIN;
break;
case POLLPRI:
pollEvents[i].TriggeredEvents = PAL_POLLPRI;
break;
case POLLOUT:
pollEvents[i].TriggeredEvents = PAL_POLLOUT;
break;
case POLLERR:
pollEvents[i].TriggeredEvents = PAL_POLLERR;
break;
case POLLHUP:
pollEvents[i].TriggeredEvents = PAL_POLLHUP;
break;
case POLLNVAL:
pollEvents[i].TriggeredEvents = PAL_POLLNVAL;
break;
default:
pollEvents[i].TriggeredEvents = (int16_t)pfd->revents;
break;
}
}
*triggered = (uint32_t)rv;
if (!useStackBuffer)
{
free(pollfds);
}
return Error_SUCCESS;
}
extern "C" Error SystemNative_Poll(PollEvent* pollEvents, uint32_t eventCount, int32_t milliseconds, uint32_t* triggered)
{
if (pollEvents == nullptr || triggered == nullptr)
{
return PAL_EFAULT;
}
if (milliseconds < -1)
{
return PAL_EINVAL;
}
size_t bufferSize;
if (!multiply_s(sizeof(pollfd), static_cast<size_t>(eventCount), &bufferSize))
{
return SystemNative_ConvertErrorPlatformToPal(EOVERFLOW);
}
bool useStackBuffer = bufferSize <= 2048;
pollfd* pollfds = reinterpret_cast<pollfd*>(useStackBuffer ? alloca(bufferSize) : malloc(bufferSize));
if (pollfds == nullptr)
{
return PAL_ENOMEM;
}
for (uint32_t i = 0; i < eventCount; i++)
{
const PollEvent& event = pollEvents[i];
pollfds[i] = { .fd = event.FileDescriptor, .events = event.Events, .revents = 0 };
}
int rv;
while (CheckInterrupted(rv = poll(pollfds, static_cast<nfds_t>(eventCount), milliseconds)));
if (rv < 0)
{
if (!useStackBuffer)
{
free(pollfds);
}
*triggered = 0;
return SystemNative_ConvertErrorPlatformToPal(errno);
}
for (uint32_t i = 0; i < eventCount; i++)
{
const pollfd& pfd = pollfds[i];
assert(pfd.fd == pollEvents[i].FileDescriptor);
assert(pfd.events == pollEvents[i].Events);
pollEvents[i].TriggeredEvents = static_cast<PollEvents>(pfd.revents);
}
*triggered = static_cast<uint32_t>(rv);
if (!useStackBuffer)
{
free(pollfds);
}
return PAL_SUCCESS;
}
extern "C" int32_t SystemNative_PosixFAdvise(intptr_t fd, int64_t offset, int64_t length, FileAdvice advice)
{
#if HAVE_POSIX_ADVISE
int32_t result;
while (CheckInterrupted(
result =
#if HAVE_POSIX_FADVISE64
posix_fadvise64(
#else
posix_fadvise(
#endif
ToFileDescriptor(fd),
offset,
length,
advice)));
return result;
#else
// Not supported on this platform. Caller can ignore this failure since it's just a hint.
(void)fd, (void)offset, (void)length, (void)advice;
return ENOTSUP;
#endif
}
