47 lines
1.6 KiB
C#
47 lines
1.6 KiB
C#
//------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------
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namespace System.ServiceModel.Channels
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{
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using System.Runtime;
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using System.Runtime.InteropServices;
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using System.Runtime.Versioning;
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using System.Security;
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[SuppressUnmanagedCodeSecurity]
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internal static class SafeNativeMethods
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{
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public const string KERNEL32 = "kernel32.dll";
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[DllImport(KERNEL32, SetLastError = false)]
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[ResourceExposure(ResourceScope.None)]
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static extern uint GetSystemTimeAdjustment(
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[Out] out int adjustment,
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[Out] out uint increment,
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[Out] out uint adjustmentDisabled
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);
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[DllImport(KERNEL32, SetLastError = true)]
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[ResourceExposure(ResourceScope.None)]
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public static extern void GetSystemTimeAsFileTime(out long time);
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[Fx.Tag.SecurityNote(Critical = "Calls critical method GetSystemTimeAdjustment.",
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Safe = "Method is a SafeNativeMethod.")]
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[SecuritySafeCritical]
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internal static long GetSystemTimeResolution()
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{
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int dummyAdjustment;
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uint increment;
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uint dummyAdjustmentDisabled;
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if (GetSystemTimeAdjustment(out dummyAdjustment, out increment, out dummyAdjustmentDisabled) != 0)
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{
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return (long)increment;
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}
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// Assume the default, which is around 15 milliseconds.
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return 15 * TimeSpan.TicksPerMillisecond;
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}
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}
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}
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