52 lines
1.7 KiB
C#
52 lines
1.7 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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// This file reiimplements CoreFX source file 'src/Common/src/Interop/Unix/System.Native/Interop.Read.cs'
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using Microsoft.Win32.SafeHandles;
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using System;
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internal static partial class Interop
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{
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internal static partial class Sys
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{
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static Sys ()
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{
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Interop.mono_pal_init ();
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}
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/// <summary>
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/// Reads a number of bytes from an open file descriptor into a specified buffer.
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/// </summary>
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/// <param name="fd">The open file descriptor to try to read from</param>
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/// <param name="buffer">The buffer to read info into</param>
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/// <param name="count">The size of the buffer</param>
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/// <returns>
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/// Returns the number of bytes read on success; otherwise, -1 is returned
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/// Note - on fail. the position of the stream may change depending on the platform; consult man 2 read for more info
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/// </returns>
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internal static unsafe int Read (SafeFileHandle fd, byte* buffer, int count)
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{
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int bytes_read = -1;
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bool release = false;
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try {
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fd.DangerousAddRef (ref release);
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do {
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bytes_read = Read (fd.DangerousGetHandle (), buffer, count);
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} while (bytes_read < 0 && Marshal.GetLastWin32Error () == (int) Interop.Error.EINTR);
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}
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finally {
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if (release)
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fd.DangerousRelease ();
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}
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return bytes_read;
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}
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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internal static extern unsafe int Read (IntPtr fd, byte* buffer, int count);
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}
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}
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