Merge pull request #2901 from nguerrera/shim-open

 Use shims for open, close, unlink, shm_open, shm_unlink

Author: nguerrera

src/Common/src/Interop/FreeBSD/libc/Interop.OpenFlags.cs

@@ -1,13 +1,20 @@
 // Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+using System;
 using System.Runtime.InteropServices;
 
 internal static partial class Interop
 {
     internal static partial class libc
     {
+        [Flags]
+        internal enum Pipe2Flags
+        {
+            O_CLOEXEC   = 0x80000,
+        }
+
         [DllImport(Libraries.Libc, SetLastError = true)]
-        internal static extern unsafe int pipe2(int* pipefd, int flags);
+        internal static extern unsafe int pipe2(int* pipefd, Pipe2Flags flags);
     }
 }

src/Common/src/Interop/Linux/libc/Interop.OpenFlags.cs

@@ -5,9 +5,9 @@
 
 internal static partial class Interop
 {
-    internal static partial class libc
+    internal static partial class Sys
     {
-        [DllImport(Libraries.Libc, SetLastError = true)]
-        internal static extern int close(int fd);
+        [DllImport(Libraries.SystemNative, SetLastError = true)]
+        internal static extern int Close(int fd);
     }
 }

src/Common/src/Interop/Linux/libc/Interop.pipe2.cs

@@ -1,16 +1,13 @@
 // Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-using System;
 using System.Runtime.InteropServices;
 
-using mode_t  = System.Int32;
-
 internal static partial class Interop
 {
-    internal static partial class libc
+    internal static partial class Sys
     {
-        [DllImport(Libraries.Libc, SetLastError = true)]
-        internal static extern int open(string filename, OpenFlags flags, mode_t mode);
+        [DllImport(Libraries.SystemNative, SetLastError = true)]
+        internal static extern int Open(string filename, OpenFlags flags, int mode);
     }
 }

src/Common/src/Interop/Linux/librt/Interop.shm_open.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+internal static partial class Interop
+{
+    internal static partial class Sys
+    {
+        [Flags]
+        internal enum OpenFlags
+        {
+            // Access modes (mutually exclusive)
+            O_RDONLY = 0x0000,
+            O_WRONLY = 0x0001,
+            O_RDWR   = 0x0002,
+
+            // Flags (combineable)
+            O_CLOEXEC = 0x0010,
+            O_CREAT   = 0x0020,
+            O_EXCL    = 0x0040,
+            O_TRUNC   = 0x0080,
+            O_SYNC    = 0x0100,
+        }
+    }
+}

src/Common/src/Interop/OSX/libc/Interop.OpenFlags.cs

@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class Sys
+    {
+        [DllImport(Libraries.SystemNative, SetLastError = true)]
+        internal static extern int ShmOpen(string name, OpenFlags flags, int mode);
+
+        [DllImport(Libraries.SystemNative, SetLastError = true)]
+        internal static extern int ShmUnlink(string name);
+    }
+}