public SelectCompletion(Thread current, int maxfds, UserPtr inp, UserPtr outp, UserPtr exp, SelectHelper helper, ByteBufferRef buf)
: base(current, Kind.SelectCompletionKind, buf)
{
this.fds = maxfds;
this.inp = inp;
this.outp = outp;
this.exp = exp;
this.helper = helper;
}
public static int Select(Thread current, ref Arch.ExceptionRegisters regs, int maxfds, UserPtr inp, UserPtr outp, UserPtr exp, UserPtr tvp)
{
var helper = new SelectHelper();
int ret = 0;
ret = helper.AddUserFdList(current, inp, maxfds, POLLIN);
if (ret < 0)
return ret;
ret = helper.AddUserFdList(current, outp, maxfds, POLLOUT);
if (ret < 0)
return ret;
ret = helper.AddUserFdList(current, exp, maxfds, POLLERR);
if (ret < 0)
return ret;
int timeout = 0;
timeval tv;
if (tvp == UserPtr.Zero)
{
timeout = -1;
}
else if (tvp.Read(current, out tv) != 0)
{
return -ErrorCode.EFAULT;
}
else
{
timeout = (int)(tv.tv_sec * 1000 + tv.tv_usec / 1000);
}
var nfds = helper.TotalFds;
var pollfd_size = pollfd.Size * nfds;
var buf = Globals.AllocateAlignedCompletionBuffer(pollfd_size);
if (!buf.isValid)
return -ErrorCode.ENOMEM;
helper.WritePollFds(buf);
var select_entry = new SelectCompletion(current, maxfds, inp, outp, exp, helper, buf);
ret = Arch.IPCStubs.PollAsync(current.Parent.helperPid, current.impl._value.thread._value, new Pointer(buf.Location), nfds, timeout);
if (ret < 0)
{
select_entry.Dispose();
return ret;
}
Globals.CompletionQueue.Enqueue(select_entry);
current.SaveState(ref regs);
current.AsyncReturn = true;
return 0;
}