Add kwin full source tree, greeter login, zsh, pcid service, and build system improvements

local/recipes/kde/kwin/src/utils/filedescriptor.cpp

@@ -0,0 +1,109 @@
+/*
+    KWin - the KDE window manager
+    This file is part of the KDE project.
+
+    SPDX-FileCopyrightText:: 2022 Xaver Hugl <xaver.hugl@gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+#include "filedescriptor.h"
+
+#include <fcntl.h>
+#include <sys/poll.h>
+#include <unistd.h>
+#include <utility>
+
+namespace KWin
+{
+
+FileDescriptor::FileDescriptor(int fd)
+    : m_fd(fd)
+{
+}
+
+FileDescriptor::FileDescriptor(FileDescriptor &&other)
+    : m_fd(std::exchange(other.m_fd, -1))
+{
+}
+
+FileDescriptor &FileDescriptor::operator=(FileDescriptor &&other)
+{
+    if (m_fd != -1) {
+        ::close(m_fd);
+    }
+    m_fd = std::exchange(other.m_fd, -1);
+    return *this;
+}
+
+FileDescriptor::~FileDescriptor()
+{
+    if (m_fd != -1) {
+        ::close(m_fd);
+    }
+}
+
+bool FileDescriptor::isValid() const
+{
+    return m_fd != -1;
+}
+
+int FileDescriptor::get() const
+{
+    return m_fd;
+}
+
+int FileDescriptor::take()
+{
+    return std::exchange(m_fd, -1);
+}
+
+void FileDescriptor::reset()
+{
+    if (m_fd != -1) {
+        ::close(m_fd);
+        m_fd = -1;
+    }
+}
+
+FileDescriptor FileDescriptor::duplicate() const
+{
+    if (m_fd != -1) {
+        return FileDescriptor{fcntl(m_fd, F_DUPFD_CLOEXEC, 0)};
+    } else {
+        return {};
+    }
+}
+
+bool FileDescriptor::isClosed() const
+{
+    return isClosed(m_fd);
+}
+
+bool FileDescriptor::isReadable() const
+{
+    return isReadable(m_fd);
+}
+
+bool FileDescriptor::isClosed(int fd)
+{
+    pollfd pfd = {
+        .fd = fd,
+        .events = POLLIN,
+        .revents = 0,
+    };
+    if (poll(&pfd, 1, 0) < 0) {
+        return true;
+    }
+    return pfd.revents & (POLLHUP | POLLERR);
+}
+
+bool FileDescriptor::isReadable(int fd)
+{
+    pollfd pfd = {
+        .fd = fd,
+        .events = POLLIN,
+        .revents = 0,
+    };
+    return poll(&pfd, 1, 0) && (pfd.revents & (POLLIN | POLLNVAL)) != 0;
+}
+}