auto import from //depot/cupcake/@135843

1 files changed, 52 insertions, 0 deletions

diff --git a/libc/unistd/usleep.c b/libc/unistd/usleep.c
new file mode 100644
index 0000000..75458b1
--- /dev/null
+++ b/libc/unistd/usleep.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * 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 OWNER 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 <time.h>
+#include <errno.h>
+
+void usleep(unsigned long usec)
+{
+  struct timespec ts;
+
+  ts.tv_sec  = usec/1000000UL;
+
+#ifdef __arm__
+    /* avoid divisions and modulos on the ARM */
+  ts.tv_nsec = (usec - ts.tv_sec*1000000UL)*1000;
+#else
+  ts.tv_nsec = (usec % 1000000UL) * 1000UL;
+#endif
+
+  for (;;)
+  {
+    if ( nanosleep( &ts, &ts ) >= 0 )
+        break;
+
+    if ( errno != EINTR )
+        break;
+  }
+}