C23: add timespec_getres() and the new TIME_* constants.
Nothing to see here --- you'll want to keep using POSIX clock_gettime()
and clock_getres() instead. But portable code might use this eventually,
and it's trivial, so let's add it anyway.
(The whole "zero as an error return" precluding the direct use of
Linux's CLOCK_ constants is what really makes this a terrible API ---
we're going to have to add explicit translation any time they add a
new base.)
Test: treehugger
Change-Id: Iddb6cbe67b67b2b10fdd8b5ee654896d23deee47
diff --git a/libc/bionic/time.cpp b/libc/bionic/time.cpp
new file mode 100644
index 0000000..3a41027
--- /dev/null
+++ b/libc/bionic/time.cpp
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2018 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>
+
+static clockid_t __base_to_clock(int base) {
+ switch (base) {
+ case TIME_UTC:
+ return CLOCK_REALTIME;
+ case TIME_MONOTONIC:
+ return CLOCK_MONOTONIC;
+ case TIME_ACTIVE:
+ return CLOCK_PROCESS_CPUTIME_ID;
+ case TIME_THREAD_ACTIVE:
+ return CLOCK_THREAD_CPUTIME_ID;
+ default:
+ return -1;
+ }
+}
+
+int timespec_get(timespec* ts, int base) {
+ clockid_t clock = __base_to_clock(base);
+ return (clock != -1 && clock_gettime(clock, ts) != -1) ? base : 0;
+}
+
+int timespec_getres(timespec* ts, int base) {
+ clockid_t clock = __base_to_clock(base);
+ return (clock != -1 && clock_getres(clock, ts) != -1) ? base : 0;
+}