ams: support building unit test programs on windows/linux/macos

libraries/libstratosphere/source/os/impl/os_timeout_helper_impl.os.linux.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include "os_timeout_helper_impl.os.linux.hpp"
+
+#include <time.h>
+
+namespace ams::os::impl {
+
+    void TimeoutHelperImpl::Sleep(TimeSpan tm) {
+        /* If asked to sleep for no time, do nothing */
+        if (tm == 0) {
+            return;
+        }
+
+        constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
+        const s64 ns = tm.GetNanoSeconds();
+        struct timespec ts = { .tv_sec = (ns / NanoSecondsPerSecond), .tv_nsec = ns % NanoSecondsPerSecond };
+
+        while (true) {
+            const auto ret = ::nanosleep(std::addressof(ts), std::addressof(ts));
+            if (ret == 0) {
+                break;
+            }
+
+            AMS_ASSERT(errno == EINTR);
+        }
+    }
+
+}