forked from OSchip/llvm-project
77 lines
1.8 KiB
C++
77 lines
1.8 KiB
C++
//===--------------------- KQueue.cpp ---------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "KQueue.h"
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#ifdef LLDB_USE_KQUEUES
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#include "lldb/Core/Error.h"
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#include "Utility/TimeSpecTimeout.h"
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using namespace lldb_private;
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int KQueue::GetFD(bool can_create) {
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if (!IsValid() && can_create)
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m_fd = kqueue();
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return m_fd;
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}
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int KQueue::Close() {
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const int fd = m_fd;
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if (fd >= 0) {
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m_fd = -1;
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return close(fd);
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}
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return 0;
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}
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int KQueue::WaitForEvents(struct kevent *events, int num_events, Error &error,
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uint32_t timeout_usec) {
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const int fd_kqueue = GetFD(false);
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if (fd_kqueue >= 0) {
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TimeSpecTimeout timeout;
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const struct timespec *timeout_ptr =
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timeout.SetRelativeTimeoutMircoSeconds32(timeout_usec);
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int result = ::kevent(fd_kqueue, NULL, 0, events, num_events, timeout_ptr);
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if (result == -1)
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error.SetErrorToErrno();
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else
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error.Clear();
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return result;
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} else {
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error.SetErrorString("invalid kqueue fd");
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}
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return 0;
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}
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bool KQueue::AddFDEvent(int fd, bool read, bool write, bool vnode) {
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const int fd_kqueue = GetFD(true);
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if (fd_kqueue >= 0) {
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struct kevent event;
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event.ident = fd;
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event.filter = 0;
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if (read)
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event.filter |= EVFILT_READ;
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if (write)
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event.filter |= EVFILT_WRITE;
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if (vnode)
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event.filter |= EVFILT_VNODE;
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event.flags = EV_ADD | EV_CLEAR;
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event.fflags = 0;
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event.data = 0;
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event.udata = NULL;
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int err = ::kevent(fd_kqueue, &event, 1, NULL, 0, NULL);
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return err == 0;
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}
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return false;
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}
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#endif
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