45 lines
1.4 KiB
C#
45 lines
1.4 KiB
C#
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namespace Unosquare.RaspberryIO.Abstractions.Native
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{
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using System;
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using System.Runtime.InteropServices;
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using System.Text;
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/// <summary>
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/// Provides standard 'libc' calls using platform-invoke.
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/// </summary>
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public static class Standard
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{
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internal const string LibCLibrary = "libc";
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#region LibC Calls
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/// <summary>
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/// Strerrors the specified error.
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/// </summary>
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/// <param name="error">The error.</param>
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/// <returns>The error string.</returns>
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public static string Strerror(int error)
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{
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if (Type.GetType("Mono.Runtime") == null) return Marshal.PtrToStringAnsi(StrError(error));
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try
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{
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var buffer = new StringBuilder(256);
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var result = Strerror(error, buffer, (ulong)buffer.Capacity);
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return (result != -1) ? buffer.ToString() : null;
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}
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catch (Exception)
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{
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return null;
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}
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}
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[DllImport(LibCLibrary, EntryPoint = "strerror", SetLastError = true)]
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private static extern IntPtr StrError(int errnum);
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[DllImport("MonoPosixHelper", EntryPoint = "Mono_Posix_Syscall_strerror_r", SetLastError = true)]
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private static extern int Strerror(int error, [Out] StringBuilder buffer, ulong length);
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#endregion
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}
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}
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