1 files changed, 56 insertions, 0 deletions
diff --git a/Kernel/Syscalls/sleep.cpp b/Kernel/Syscalls/sleep.cpp
new file mode 100644
index 0000000000..e768ff7b22
--- /dev/null
+++ b/Kernel/Syscalls/sleep.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/Process.h>
+#include <Kernel/Time/TimeManagement.h>
+
+namespace Kernel {
+
+int Process::sys$usleep(useconds_t usec)
+{
+    REQUIRE_PROMISE(stdio);
+    if (!usec)
+        return 0;
+    u64 wakeup_time = Thread::current()->sleep(usec * TimeManagement::the().ticks_per_second() / 1000000);
+    if (wakeup_time > g_uptime)
+        return -EINTR;
+    return 0;
+}
+
+int Process::sys$sleep(unsigned seconds)
+{
+    REQUIRE_PROMISE(stdio);
+    if (!seconds)
+        return 0;
+    u64 wakeup_time = Thread::current()->sleep(seconds * TimeManagement::the().ticks_per_second());
+    if (wakeup_time > g_uptime) {
+        u32 ticks_left_until_original_wakeup_time = wakeup_time - g_uptime;
+        return ticks_left_until_original_wakeup_time / TimeManagement::the().ticks_per_second();
+    }
+    return 0;
+}
+
+}