SafeNativeMethods.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Channels / SafeNativeMethods.cs / 1 / SafeNativeMethods.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
namespace System.ServiceModel.Channels
{ 
    using System.Security;
    using System.Runtime.InteropServices; 
 
    [SuppressUnmanagedCodeSecurity]
    internal static class SafeNativeMethods 
    {
        public const string KERNEL32 = "kernel32.dll";

        [DllImport(KERNEL32, SetLastError = false)] 
        static extern uint GetSystemTimeAdjustment(
            [Out] out int adjustment, 
            [Out] out uint increment, 
            [Out] out uint adjustmentDisabled
        ); 

        [DllImport(KERNEL32, SetLastError = true)]
        public static extern void GetSystemTimeAsFileTime(out long time);
 
        /// 
        /// Critical - calls critical method GetSystemTimeAdjustment 
        /// Safe - method is a SafeNativeMethod 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        internal static long GetSystemTimeResolution()
        {
            int dummyAdjustment;
            uint increment; 
            uint dummyAdjustmentDisabled;
 
            if (GetSystemTimeAdjustment(out dummyAdjustment, out increment, out dummyAdjustmentDisabled) != 0) 
            {
                return (long)increment; 
            }

            // Assume the default, which is around 15 milliseconds.
            return 15 * TimeSpan.TicksPerMillisecond; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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