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//
// Interop.cs
//
// Author:
// Marius Ungureanu <maungu@microsoft.com>
//
// Copyright (c) 2018 Microsoft Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Runtime.InteropServices;
namespace MacPlatform
{
static class Interop
{
[DllImport ("libc")]
extern static int sysctlbyname (string name, IntPtr oldP, ref nint oldLen, IntPtr newP, nint newlen);
internal static int SysCtl (string name, out string result)
{
nint resultLen = 128;
var resultHandle = Marshal.AllocHGlobal ((int)resultLen);
var retval = sysctlbyname (name, resultHandle, ref resultLen, IntPtr.Zero, 0);
// resultLen includes the null terminal, so we want to cut it off
// but if resultLen < 2 then there's no characters
if (retval != 0 || resultLen < 2) {
result = "Unknown";
return retval;
}
result = Marshal.PtrToStringAuto (resultHandle, (int)resultLen - 1);
Marshal.FreeHGlobal (resultHandle);
return retval;
}
internal static int SysCtl (string name, out int result)
{
nint resultLen = 128;
var resultHandle = Marshal.AllocHGlobal ((int)resultLen);
var retval = sysctlbyname (name, resultHandle, ref resultLen, IntPtr.Zero, 0);
if (retval != 0) {
result = -1;
return retval;
}
result = Marshal.ReadInt32 (resultHandle);
Marshal.FreeHGlobal (resultHandle);
return retval;
}
internal static int SysCtl (string name, out long result)
{
nint resultLen = 128;
var resultHandle = Marshal.AllocHGlobal ((int)resultLen);
var retval = sysctlbyname (name, resultHandle, ref resultLen, IntPtr.Zero, 0);
if (retval != 0) {
result = -1;
return retval;
}
result = Marshal.ReadInt64 (resultHandle);
Marshal.FreeHGlobal (resultHandle);
return retval;
}
}
}
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