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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 03:01:46 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 03:01:46 +0000
commitf8fe689a81f906d1b91bb3220acde2a4ecb14c5b (patch)
tree26484e9d7e2c67806c2d1760196ff01aaa858e8c /src/VBox/Runtime/r3/linux/time-linux.cpp
parentInitial commit. (diff)
downloadvirtualbox-f8fe689a81f906d1b91bb3220acde2a4ecb14c5b.tar.xz
virtualbox-f8fe689a81f906d1b91bb3220acde2a4ecb14c5b.zip
Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Runtime/r3/linux/time-linux.cpp')
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diff --git a/src/VBox/Runtime/r3/linux/time-linux.cpp b/src/VBox/Runtime/r3/linux/time-linux.cpp
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+/* $Id: time-linux.cpp $ */
+/** @file
+ * IPRT - Time, POSIX.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#define RTTIME_INCL_TIMEVAL
+#include <sys/time.h>
+#include <time.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#ifndef __NR_clock_gettime
+# define __NR_timer_create 259
+# define __NR_clock_gettime (__NR_timer_create+6)
+#endif
+
+#include <iprt/time.h>
+#include "internal/time.h"
+
+
+DECLINLINE(int) sys_clock_gettime(clockid_t id, struct timespec *ts)
+{
+ int rc = syscall(__NR_clock_gettime, id, ts);
+ if (rc >= 0)
+ return rc;
+ return -1;
+}
+
+
+/**
+ * Wrapper around various monotone time sources.
+ */
+DECLINLINE(int) mono_clock(struct timespec *ts)
+{
+ static int iWorking = -1;
+ switch (iWorking)
+ {
+#ifdef CLOCK_MONOTONIC
+ /*
+ * Standard clock_gettime()
+ */
+ case 0:
+ return clock_gettime(CLOCK_MONOTONIC, ts);
+
+ /*
+ * Syscall clock_gettime().
+ */
+ case 1:
+ return sys_clock_gettime(CLOCK_MONOTONIC, ts);
+
+#endif /* CLOCK_MONOTONIC */
+
+
+ /*
+ * Figure out what's working.
+ */
+ case -1:
+ {
+#ifdef CLOCK_MONOTONIC
+ /*
+ * Real-Time API.
+ */
+ int rc = clock_gettime(CLOCK_MONOTONIC, ts);
+ if (!rc)
+ {
+ iWorking = 0;
+ return 0;
+ }
+
+ rc = sys_clock_gettime(CLOCK_MONOTONIC, ts);
+ if (!rc)
+ {
+ iWorking = 1;
+ return 0;
+ }
+#endif /* CLOCK_MONOTONIC */
+
+ /* give up */
+ iWorking = -2;
+ break;
+ }
+ }
+ return -1;
+}
+
+
+DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
+{
+ /* check monotonic clock first. */
+ static bool fMonoClock = true;
+ if (fMonoClock)
+ {
+ struct timespec ts;
+ if (!mono_clock(&ts))
+ return (uint64_t)ts.tv_sec * RT_NS_1SEC_64
+ + ts.tv_nsec;
+ fMonoClock = false;
+ }
+
+ /* fallback to gettimeofday(). */
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
+ + (uint64_t)(tv.tv_usec * RT_NS_1US);
+}
+
+
+/**
+ * Gets the current nanosecond timestamp.
+ *
+ * This differs from RTTimeNanoTS in that it will use system APIs and not do any
+ * resolution or performance optimizations.
+ *
+ * @returns nanosecond timestamp.
+ */
+RTDECL(uint64_t) RTTimeSystemNanoTS(void)
+{
+ return rtTimeGetSystemNanoTS();
+}
+
+
+/**
+ * Gets the current millisecond timestamp.
+ *
+ * This differs from RTTimeNanoTS in that it will use system APIs and not do any
+ * resolution or performance optimizations.
+ *
+ * @returns millisecond timestamp.
+ */
+RTDECL(uint64_t) RTTimeSystemMilliTS(void)
+{
+ return rtTimeGetSystemNanoTS() / RT_NS_1MS;
+}
+