84 lines
3.3 KiB
C#
84 lines
3.3 KiB
C#
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namespace Unosquare.RaspberryIO.Native
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{
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using Swan;
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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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internal 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></returns>
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public static string Strerror(int error)
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{
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if (!Runtime.IsUsingMonoRuntime) return 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 (EntryPointNotFoundException)
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{
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return null;
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}
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}
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/// <summary>
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/// Changes file permissions on a Unix file system
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/// </summary>
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/// <param name="filename">The filename.</param>
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/// <param name="mode">The mode.</param>
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/// <returns>The result</returns>
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[DllImport(LibCLibrary, EntryPoint = "chmod", SetLastError = true)]
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public static extern int Chmod(string filename, uint mode);
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/// <summary>
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/// Converts a string to a 32 bit integer. Use endpointer as IntPtr.Zero
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/// </summary>
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/// <param name="numberString">The number string.</param>
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/// <param name="endPointer">The end pointer.</param>
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/// <param name="numberBase">The number base.</param>
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/// <returns>The result</returns>
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[DllImport(LibCLibrary, EntryPoint = "strtol", SetLastError = true)]
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public static extern int StringToInteger(string numberString, IntPtr endPointer, int numberBase);
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/// <summary>
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/// The write() function attempts to write nbytes from buffer to the file associated with handle. On text files, it expands each LF to a CR/LF.
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/// The function returns the number of bytes written to the file. A return value of -1 indicates an error, with errno set appropriately.
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/// </summary>
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/// <param name="fd">The fd.</param>
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/// <param name="buffer">The buffer.</param>
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/// <param name="count">The count.</param>
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/// <returns>The result</returns>
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[DllImport(LibCLibrary, EntryPoint = "write", SetLastError = true)]
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public static extern int Write(int fd, byte[] buffer, int count);
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/// <summary>
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/// Fills in the structure with information about the system.
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/// </summary>
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/// <param name="name">The name.</param>
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/// <returns>The result</returns>
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[DllImport(LibCLibrary, EntryPoint = "uname", SetLastError = true)]
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public static extern int Uname(out SystemName name);
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[DllImport(LibCLibrary, EntryPoint = "strerror", SetLastError = true)]
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private static extern string 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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