// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
-#if NET_4_0
-
using System;
using System.IO;
using System.Collections.Generic;
using Microsoft.Win32.SafeHandles;
using System.Runtime.InteropServices;
-
-
-#if !MOBILE
-using Mono.Unix.Native;
-using Mono.Unix;
-#else
using System.Runtime.CompilerServices;
-#endif
+
namespace System.IO.MemoryMappedFiles
{
-#if !MOBILE
- internal static class MemoryMapImpl {
- //
- // Turns the FileMode into the first half of open(2) flags
- //
- static OpenFlags ToUnixMode (FileMode mode)
- {
- switch (mode){
- case FileMode.CreateNew:
- return OpenFlags.O_CREAT | OpenFlags.O_EXCL;
-
- case FileMode.Create:
- return OpenFlags.O_CREAT | OpenFlags.O_TRUNC;
-
- case FileMode.OpenOrCreate:
- return OpenFlags.O_CREAT;
-
- case FileMode.Truncate:
- return OpenFlags.O_TRUNC;
-
- case FileMode.Append:
- return OpenFlags.O_APPEND;
- default:
- case FileMode.Open:
- return 0;
- }
- }
-
- //
- // Turns the MemoryMappedFileAccess into the second half of open(2) flags
- //
- static OpenFlags ToUnixMode (MemoryMappedFileAccess access)
- {
- switch (access){
- case MemoryMappedFileAccess.CopyOnWrite:
- case MemoryMappedFileAccess.ReadWriteExecute:
- case MemoryMappedFileAccess.ReadWrite:
- return OpenFlags.O_RDWR;
-
- case MemoryMappedFileAccess.Write:
- return OpenFlags.O_WRONLY;
-
- case MemoryMappedFileAccess.ReadExecute:
- case MemoryMappedFileAccess.Read:
- default:
- return OpenFlags.O_RDONLY;
- }
- }
-
- static MmapProts ToUnixProts (MemoryMappedFileAccess access)
- {
- switch (access){
- case MemoryMappedFileAccess.ReadWrite:
- return MmapProts.PROT_WRITE | MmapProts.PROT_READ;
-
- case MemoryMappedFileAccess.Write:
- return MmapProts.PROT_WRITE;
-
- case MemoryMappedFileAccess.CopyOnWrite:
- return MmapProts.PROT_WRITE | MmapProts.PROT_READ;
-
- case MemoryMappedFileAccess.ReadExecute:
- return MmapProts.PROT_EXEC;
-
- case MemoryMappedFileAccess.ReadWriteExecute:
- return MmapProts.PROT_WRITE | MmapProts.PROT_READ | MmapProts.PROT_EXEC;
-
- case MemoryMappedFileAccess.Read:
- default:
- return MmapProts.PROT_READ;
- }
- }
-
- internal static int Open (string path, FileMode mode, ref long capacity, MemoryMappedFileAccess access)
- {
- if (MonoUtil.IsUnix){
- Stat buf;
- if (Syscall.stat (path, out buf) == -1)
- UnixMarshal.ThrowExceptionForLastError ();
-
- if (capacity == 0) {
- // Special files such as FIFOs, sockets, and devices can
- // have a size of 0. Specifying a capacity for these
- // also makes little sense, so don't do the check if the
- // file is one of these.
- if (buf.st_size == 0 &&
- (buf.st_mode & (FilePermissions.S_IFCHR |
- FilePermissions.S_IFBLK |
- FilePermissions.S_IFIFO |
- FilePermissions.S_IFSOCK)) == 0) {
- throw new ArgumentException ("A positive capacity must be specified for a Memory Mapped File backed by an empty file.");
- }
-
- capacity = buf.st_size;
- } else if (capacity < buf.st_size) {
- throw new ArgumentException ("The capacity may not be smaller than the file size.");
- }
-
- int fd = Syscall.open (path, ToUnixMode (mode) | ToUnixMode (access), FilePermissions.DEFFILEMODE);
-
- if (fd == -1)
- UnixMarshal.ThrowExceptionForLastError ();
- return fd;
- }
-
- throw new NotImplementedException ();
- }
-
- internal static void CloseFD (int fd) {
- Syscall.close (fd);
- }
-
- internal static void Flush (int fd) {
- if (MonoUtil.IsUnix)
- Syscall.fsync (fd);
- else
- throw new NotImplementedException ("Not implemented on Windows");
-
- }
-
- static int pagesize;
-
- internal static unsafe void Map (int file_handle, long offset, ref long size, MemoryMappedFileAccess access, out IntPtr map_addr, out int offset_diff)
- {
- if (!MonoUtil.IsUnix)
- throw new NotImplementedException ("Not implemented on windows.");
-
- if (pagesize == 0)
- pagesize = Syscall.getpagesize ();
-
- Stat buf;
- Syscall.fstat (file_handle, out buf);
- long fsize = buf.st_size;
-
- if (size == 0 || size > fsize)
- size = fsize;
-
- // Align offset
- long real_offset = offset & ~(pagesize - 1);
-
- offset_diff = (int)(offset - real_offset);
-
- // FIXME: Need to determine the unix fd for the file, Handle is only
- // equal to it by accident
- //
- // The new API no longer uses FileStream everywhere, but exposes instead
- // the filename (with one exception), we could move this API to use
- // file descriptors instead of the FileStream plus its Handle.
- //
- map_addr = Syscall.mmap (IntPtr.Zero, (ulong) size,
- ToUnixProts (access),
- access == MemoryMappedFileAccess.CopyOnWrite ? MmapFlags.MAP_PRIVATE : MmapFlags.MAP_SHARED,
- file_handle, real_offset);
-
- if (map_addr == (IntPtr)(-1))
- throw new IOException ("mmap failed for fd#" + file_handle + "(" + offset + ", " + size + ")");
- }
-
- internal static bool Unmap (IntPtr map_addr, ulong map_size)
- {
- if (!MonoUtil.IsUnix)
- return false;
- return Syscall.munmap (map_addr, map_size) == 0;
- }
-
- static void ConfigureUnixFD (IntPtr handle, HandleInheritability h)
- {
- // TODO: Mono.Posix is lacking O_CLOEXEC definitions for fcntl.
- }
-
-
- [DllImport("kernel32", SetLastError = true)]
- static extern bool SetHandleInformation (IntPtr hObject, int dwMask, int dwFlags);
- static void ConfigureWindowsFD (IntPtr handle, HandleInheritability h)
- {
- SetHandleInformation (handle, 1 /* FLAG_INHERIT */, h == HandleInheritability.None ? 0 : 1);
- }
-
- internal static void ConfigureFD (IntPtr handle, HandleInheritability inheritability)
- {
- if (MonoUtil.IsUnix)
- ConfigureUnixFD (handle, inheritability);
- else
- ConfigureWindowsFD (handle, inheritability);
- }
-
- }
-#else
internal static class MemoryMapImpl {
- [DllImport ("libc")]
- static extern int fsync (int fd);
-
- [DllImport ("libc")]
- static extern int close (int fd);
-
- [DllImport ("libc")]
- static extern int fcntl (int fd, int cmd, int arg0);
-
- //XXX check if android off_t is 64bits or not. on iOS / darwin it is.
- [DllImport ("libc")]
- static extern IntPtr mmap (IntPtr addr, IntPtr len, int prot, int flags, int fd, long offset);
-
- [DllImport ("libc")]
- static extern int munmap (IntPtr addr, IntPtr size);
-
- [DllImport ("libc", SetLastError=true)]
- static extern int open (string path, int flags, int access);
-
-#if MONODROID
- [DllImport ("__Internal")]
- static extern int monodroid_getpagesize ();
-
- static int getpagesize ()
- {
- return monodroid_getpagesize ();
- }
-#else
- [DllImport ("libc")]
- static extern int getpagesize ();
-#endif
-
[MethodImplAttribute (MethodImplOptions.InternalCall)]
- static extern long mono_filesize_from_path (string str);
+ static extern IntPtr OpenFileInternal (string path, FileMode mode, string mapName, out long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, out int error);
[MethodImplAttribute (MethodImplOptions.InternalCall)]
- static extern long mono_filesize_from_fd (int fd);
-
- //Values valid on iOS/OSX and android ndk r6
- const int F_GETFD = 1;
- const int F_SETFD = 2;
- const int FD_CLOEXEC = 1;
- const int DEFFILEMODE = 0x666;
-
- const int O_RDONLY = 0x0;
- const int O_WRONLY = 0x1;
- const int O_RDWR = 0x2;
+ static extern IntPtr OpenHandleInternal (IntPtr handle, string mapName, out long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, out int error);
- const int PROT_READ = 0x1;
- const int PROT_WRITE = 0x2;
- const int PROT_EXEC = 0x4;
-
- const int MAP_PRIVATE = 0x2;
- const int MAP_SHARED = 0x1;
-
- const int EINVAL = 22;
-
-#if MONODROID
- const int O_CREAT = 0x040;
- const int O_TRUNC = 0x080;
- const int O_EXCL = 0x200;
-
- const int ENAMETOOLONG = 63;
-#else
- /* MONOTOUCH - usr/include/sys/fcntl.h */
- const int O_CREAT = 0x0200;
- const int O_TRUNC = 0x0400;
- const int O_EXCL = 0x0800;
-
- // usr/include/sys/errno.h
- const int ENAMETOOLONG = 63;
-#endif
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ internal extern static void CloseMapping (IntPtr handle);
- static int ToUnixMode (FileMode mode)
- {
- switch (mode) {
- case FileMode.CreateNew:
- return O_CREAT | O_EXCL;
-
- case FileMode.Create:
- return O_CREAT | O_TRUNC;
-
- case FileMode.OpenOrCreate:
- return O_CREAT;
-
- case FileMode.Truncate:
- return O_TRUNC;
- default:
- case FileMode.Open:
- return 0;
- }
- }
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ internal extern static void Flush (IntPtr file_handle);
- //
- // Turns the MemoryMappedFileAccess into the second half of open(2) flags
- //
- static int ToUnixMode (MemoryMappedFileAccess access)
- {
- switch (access) {
- case MemoryMappedFileAccess.CopyOnWrite:
- case MemoryMappedFileAccess.ReadWriteExecute:
- case MemoryMappedFileAccess.ReadWrite:
- return O_RDWR;
-
- case MemoryMappedFileAccess.Write:
- return O_WRONLY;
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ internal extern static void ConfigureHandleInheritability (IntPtr handle, HandleInheritability inheritability);
- case MemoryMappedFileAccess.ReadExecute:
- case MemoryMappedFileAccess.Read:
- default:
- return O_RDONLY;
- }
- }
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ internal extern static bool Unmap (IntPtr mmap_handle);
- static int ToUnixProts (MemoryMappedFileAccess access)
- {
- switch (access){
- case MemoryMappedFileAccess.ReadWrite:
- return PROT_WRITE | PROT_READ;
-
- case MemoryMappedFileAccess.Write:
- return PROT_WRITE;
-
- case MemoryMappedFileAccess.CopyOnWrite:
- return PROT_WRITE | PROT_READ;
-
- case MemoryMappedFileAccess.ReadExecute:
- return PROT_EXEC;
-
- case MemoryMappedFileAccess.ReadWriteExecute:
- return PROT_WRITE | PROT_READ | PROT_EXEC;
-
- case MemoryMappedFileAccess.Read:
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ extern static int MapInternal (IntPtr handle, long offset, ref long size, MemoryMappedFileAccess access, out IntPtr mmap_handle, out IntPtr base_address);
+
+ internal static void Map (IntPtr handle, long offset, ref long size, MemoryMappedFileAccess access, out IntPtr mmap_handle, out IntPtr base_address)
+ {
+ int error = MapInternal (handle, offset, ref size, access, out mmap_handle, out base_address);
+ if (error != 0)
+ throw CreateException (error, "<none>");
+ }
+
+ static Exception CreateException (int error, string path) {
+ switch (error){
+ case 1:
+ return new ArgumentException ("A positive capacity must be specified for a Memory Mapped File backed by an empty file.");
+ case 2:
+ return new ArgumentOutOfRangeException ("The capacity may not be smaller than the file size.");
+ case 3:
+ return new FileNotFoundException (path);
+ case 4:
+ return new IOException ("The file already exists");
+ case 5:
+ return new PathTooLongException ();
+ case 6:
+ return new IOException ("Could not open file");
+ case 7:
+ return new ArgumentException ("Capacity must be bigger than zero for non-file mappings");
+ case 8:
+ return new ArgumentException ("Invalid FileMode value.");
+ case 9:
+ return new IOException ("Could not map file");
default:
- return PROT_READ;
+ return new IOException ("Failed with unknown error code " + error);
}
}
- static void ThrowErrorFromErrno (int errno)
- {
- switch (errno) {
- case EINVAL: throw new ArgumentException ();
- case ENAMETOOLONG: throw new PathTooLongException ();
- default: throw new IOException ("Failed with errno " + errno);
- }
- }
-
- internal static int Open (string path, FileMode mode, ref long capacity, MemoryMappedFileAccess access)
- {
- long file_size = mono_filesize_from_path (path);
- if (file_size < 0)
- throw new FileNotFoundException (path);
-
- if (capacity > file_size)
- throw new ArgumentException ("capacity");
-
- int fd = open (path, ToUnixMode (mode) | ToUnixMode (access), DEFFILEMODE);
-
- if (fd == -1)
- ThrowErrorFromErrno (Marshal.GetLastWin32Error ());
- return fd;
- }
-
- internal static void CloseFD (int fd)
- {
- close (fd);
- }
-
- internal static void Flush (int fd)
- {
- fsync (fd);
- }
-
- internal static bool Unmap (IntPtr map_addr, ulong map_size)
- {
- return munmap (map_addr, (IntPtr)map_size) == 0;
- }
-
- static int pagesize;
-
- internal static unsafe void Map (int file_handle, long offset, ref long size, MemoryMappedFileAccess access, out IntPtr map_addr, out int offset_diff)
+ internal static IntPtr OpenFile (string path, FileMode mode, string mapName, out long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options)
{
- if (pagesize == 0)
- pagesize = getpagesize ();
-
- long fsize = mono_filesize_from_fd (file_handle);
- if (fsize < 0)
- throw new FileNotFoundException ();
-
- if (size == 0 || size > fsize)
- size = fsize;
-
- // Align offset
- long real_offset = offset & ~(pagesize - 1);
-
- offset_diff = (int)(offset - real_offset);
-
- map_addr = mmap (IntPtr.Zero, (IntPtr) size,
- ToUnixProts (access),
- access == MemoryMappedFileAccess.CopyOnWrite ? MAP_PRIVATE : MAP_SHARED,
- file_handle, real_offset);
-
- if (map_addr == (IntPtr)(-1))
- throw new IOException ("mmap failed for fd#" + file_handle + "(" + offset + ", " + size + ")");
+ int error = 0;
+ IntPtr res = OpenFileInternal (path, mode, mapName, out capacity, access, options, out error);
+ if (error != 0)
+ throw CreateException (error, path);
+ return res;
}
- internal static void ConfigureFD (IntPtr handle, HandleInheritability inheritability)
+ internal static IntPtr OpenHandle (IntPtr handle, string mapName, out long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options)
{
- int fd = (int)handle;
- int flags = fcntl (fd, F_GETFD, 0);
- if (inheritability == HandleInheritability.None)
- flags &= ~FD_CLOEXEC;
- else
- flags |= FD_CLOEXEC;
- fcntl (fd, F_SETFD, flags);
+ int error = 0;
+ IntPtr res = OpenHandleInternal (handle, mapName, out capacity, access, options, out error);
+ if (error != 0)
+ throw CreateException (error, "<none>");
+ return res;
}
-
}
-#endif
+
public class MemoryMappedFile : IDisposable {
MemoryMappedFileAccess fileAccess;
//
FileStream stream;
bool keepOpen;
- int unix_fd;
+ IntPtr handle;
public static MemoryMappedFile CreateFromFile (string path)
{
public static MemoryMappedFile CreateFromFile (string path, FileMode mode)
{
- return CreateFromFile (path, mode, null, 0, MemoryMappedFileAccess.ReadWrite);
+ long capacity = 0;
+ if (path == null)
+ throw new ArgumentNullException ("path");
+ if (path.Length == 0)
+ throw new ArgumentException ("path");
+ if (mode == FileMode.Append)
+ throw new ArgumentException ("mode");
+
+ IntPtr handle = MemoryMapImpl.OpenFile (path, mode, null, out capacity, MemoryMappedFileAccess.ReadWrite, MemoryMappedFileOptions.DelayAllocatePages);
+
+ return new MemoryMappedFile () {
+ handle = handle,
+ fileAccess = MemoryMappedFileAccess.ReadWrite,
+ fileCapacity = capacity
+ };
}
public static MemoryMappedFile CreateFromFile (string path, FileMode mode, string mapName)
if (capacity < 0)
throw new ArgumentOutOfRangeException ("capacity");
- int fd = MemoryMapImpl.Open (path, mode, ref capacity, access);
+ IntPtr handle = MemoryMapImpl.OpenFile (path, mode, mapName, out capacity, access, MemoryMappedFileOptions.DelayAllocatePages);
return new MemoryMappedFile () {
- unix_fd = fd,
+ handle = handle,
fileAccess = access,
name = mapName,
fileCapacity = capacity
};
}
-#if MOBILE
- public static MemoryMappedFile CreateFromFile (FileStream fileStream, string mapName, long capacity, MemoryMappedFileAccess access,
- HandleInheritability inheritability,
- bool leaveOpen)
-#else
+
[MonoLimitation ("memoryMappedFileSecurity is currently ignored")]
public static MemoryMappedFile CreateFromFile (FileStream fileStream, string mapName, long capacity, MemoryMappedFileAccess access,
MemoryMappedFileSecurity memoryMappedFileSecurity, HandleInheritability inheritability,
bool leaveOpen)
-#endif
{
if (fileStream == null)
throw new ArgumentNullException ("fileStream");
if ((!MonoUtil.IsUnix && capacity == 0 && fileStream.Length == 0) || (capacity > fileStream.Length))
throw new ArgumentException ("capacity");
- MemoryMapImpl.ConfigureFD (fileStream.Handle, inheritability);
+ IntPtr handle = MemoryMapImpl.OpenHandle (fileStream.Handle, mapName, out capacity, access, MemoryMappedFileOptions.DelayAllocatePages);
+
+ MemoryMapImpl.ConfigureHandleInheritability (handle, inheritability);
return new MemoryMappedFile () {
- stream = fileStream,
+ handle = handle,
fileAccess = access,
name = mapName,
fileCapacity = capacity,
+
+ stream = fileStream,
keepOpen = leaveOpen
};
}
- [MonoLimitation ("CreateNew requires that mapName be a file name on Unix")]
+
+ static MemoryMappedFile CoreShmCreate (string mapName, long capacity, MemoryMappedFileAccess access,
+ MemoryMappedFileOptions options, MemoryMappedFileSecurity memoryMappedFileSecurity,
+ HandleInheritability inheritability, FileMode mode)
+ {
+ if (mapName != null && mapName.Length == 0)
+ throw new ArgumentException ("mapName");
+ if (capacity < 0)
+ throw new ArgumentOutOfRangeException ("capacity");
+
+ IntPtr handle = MemoryMapImpl.OpenFile (null, mode, mapName, out capacity, access, options);
+
+ return new MemoryMappedFile () {
+ handle = handle,
+ fileAccess = access,
+ name = mapName,
+ fileCapacity = capacity
+ };
+ }
+
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile CreateNew (string mapName, long capacity)
{
-#if MOBILE
- return CreateNew (mapName, capacity, MemoryMappedFileAccess.ReadWrite, MemoryMappedFileOptions.DelayAllocatePages, 0);
-#else
- return CreateNew (mapName, capacity, MemoryMappedFileAccess.ReadWrite, MemoryMappedFileOptions.DelayAllocatePages, null, 0);
-#endif
+ return CreateNew (mapName, capacity, MemoryMappedFileAccess.ReadWrite, MemoryMappedFileOptions.DelayAllocatePages, null, HandleInheritability.None);
}
- [MonoLimitation ("CreateNew requires that mapName be a file name on Unix")]
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile CreateNew (string mapName, long capacity, MemoryMappedFileAccess access)
{
-#if MOBILE
- return CreateNew (mapName, capacity, access, MemoryMappedFileOptions.DelayAllocatePages, 0);
-#else
- return CreateNew (mapName, capacity, access, MemoryMappedFileOptions.DelayAllocatePages, null, 0);
-#endif
+ return CreateNew (mapName, capacity, access, MemoryMappedFileOptions.DelayAllocatePages, null, HandleInheritability.None);
}
-#if MOBILE
- public static MemoryMappedFile CreateNew (string mapName, long capacity, MemoryMappedFileAccess access,
- MemoryMappedFileOptions options,
- HandleInheritability handleInheritability)
-#else
- [MonoLimitation ("CreateNew requires that mapName be a file name on Unix; options and memoryMappedFileSecurity are ignored")]
+ [MonoLimitation ("Named mappings scope is process local; options and memoryMappedFileSecurity are ignored")]
public static MemoryMappedFile CreateNew (string mapName, long capacity, MemoryMappedFileAccess access,
MemoryMappedFileOptions options, MemoryMappedFileSecurity memoryMappedFileSecurity,
HandleInheritability inheritability)
-#endif
{
- return CreateFromFile (mapName, FileMode.CreateNew, mapName, capacity, access);
+ return CoreShmCreate (mapName, capacity, access, options, memoryMappedFileSecurity, inheritability, FileMode.CreateNew);
}
- [MonoLimitation ("CreateOrOpen requires that mapName be a file name on Unix")]
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile CreateOrOpen (string mapName, long capacity)
{
return CreateOrOpen (mapName, capacity, MemoryMappedFileAccess.ReadWrite);
}
- [MonoLimitation ("CreateOrOpen requires that mapName be a file name on Unix")]
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile CreateOrOpen (string mapName, long capacity, MemoryMappedFileAccess access)
{
- return CreateFromFile (mapName, FileMode.OpenOrCreate, mapName, capacity, access);
+ return CreateOrOpen (mapName, capacity, access, MemoryMappedFileOptions.DelayAllocatePages, null, HandleInheritability.None);
}
- [MonoTODO]
-#if MOBILE
- public static MemoryMappedFile CreateOrOpen (string mapName, long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, HandleInheritability inheritability)
-#else
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile CreateOrOpen (string mapName, long capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, MemoryMappedFileSecurity memoryMappedFileSecurity, HandleInheritability inheritability)
-#endif
{
- throw new NotImplementedException ();
+ return CoreShmCreate (mapName, capacity, access, options, memoryMappedFileSecurity, inheritability, FileMode.OpenOrCreate);
}
- [MonoTODO]
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile OpenExisting (string mapName)
{
throw new NotImplementedException ();
}
- [MonoTODO]
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile OpenExisting (string mapName, MemoryMappedFileRights desiredAccessRights)
{
throw new NotImplementedException ();
}
- [MonoTODO]
+ [MonoLimitation ("Named mappings scope is process local")]
public static MemoryMappedFile OpenExisting (string mapName, MemoryMappedFileRights desiredAccessRights, HandleInheritability inheritability)
{
throw new NotImplementedException ();
public MemoryMappedViewStream CreateViewStream ()
{
- return CreateViewStream (0, 0);
+ return CreateViewStream (0, 0);//FIXME this is wrong
}
public MemoryMappedViewStream CreateViewStream (long offset, long size)
public MemoryMappedViewStream CreateViewStream (long offset, long size, MemoryMappedFileAccess access)
{
- return new MemoryMappedViewStream (stream != null ? (int)stream.Handle : unix_fd, offset, size, access);
+ var view = MemoryMappedView.Create (handle, offset, size, access);
+ return new MemoryMappedViewStream (view);
}
public MemoryMappedViewAccessor CreateViewAccessor ()
public MemoryMappedViewAccessor CreateViewAccessor (long offset, long size, MemoryMappedFileAccess access)
{
- int file_handle = stream != null ? (int) stream.Handle : unix_fd;
-
- return new MemoryMappedViewAccessor (file_handle, offset, size, access);
+ var view = MemoryMappedView.Create (handle, offset, size, access);
+ return new MemoryMappedViewAccessor (view);
}
MemoryMappedFile ()
if (stream != null){
if (keepOpen == false)
stream.Close ();
- unix_fd = -1;
stream = null;
}
- if (unix_fd != -1) {
- MemoryMapImpl.CloseFD (unix_fd);
- unix_fd = -1;
+ if (handle != IntPtr.Zero) {
+ MemoryMapImpl.CloseMapping (handle);
+ handle = IntPtr.Zero;
}
}
}
-#if !MOBILE
[MonoTODO]
public MemoryMappedFileSecurity GetAccessControl ()
{
{
throw new NotImplementedException ();
}
-#endif
[MonoTODO]
public SafeMemoryMappedFileHandle SafeMemoryMappedFileHandle {
throw new NotImplementedException ();
}
}
+
+ // This converts a MemoryMappedFileAccess to a FileAccess. MemoryMappedViewStream and
+ // MemoryMappedViewAccessor subclass UnmanagedMemoryStream and UnmanagedMemoryAccessor, which both use
+ // FileAccess to determine whether they are writable and/or readable.
+ internal static FileAccess GetFileAccess (MemoryMappedFileAccess access) {
+
+ if (access == MemoryMappedFileAccess.Read) {
+ return FileAccess.Read;
+ }
+ if (access == MemoryMappedFileAccess.Write) {
+ return FileAccess.Write;
+ }
+ else if (access == MemoryMappedFileAccess.ReadWrite) {
+ return FileAccess.ReadWrite;
+ }
+ else if (access == MemoryMappedFileAccess.CopyOnWrite) {
+ return FileAccess.ReadWrite;
+ }
+ else if (access == MemoryMappedFileAccess.ReadExecute) {
+ return FileAccess.Read;
+ }
+ else if (access == MemoryMappedFileAccess.ReadWriteExecute) {
+ return FileAccess.ReadWrite;
+ }
+
+ // If we reached here, access was invalid.
+ throw new ArgumentOutOfRangeException ("access");
+ }
}
}
-#endif
projects / mono.git / blobdiff