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mojo/public/c/include/mojo/system/handle.h

Index: mojo/public/c/include/mojo/system/handle.h
diff --git a/mojo/public/c/include/mojo/system/handle.h b/mojo/public/c/include/mojo/system/handle.h
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-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This file contains Mojo system handle-related declarations/definitions.
-//
-// Note: This header should be compilable as C.
-
-#ifndef MOJO_PUBLIC_C_INCLUDE_MOJO_SYSTEM_HANDLE_H_
-#define MOJO_PUBLIC_C_INCLUDE_MOJO_SYSTEM_HANDLE_H_
-
-#include <mojo/macros.h>
-#include <mojo/result.h>
-#include <stdint.h>
-
-// |MojoHandle|: Handles to Mojo objects.
-//   |MOJO_HANDLE_INVALID| - A value that is never a valid handle.
-
-typedef uint32_t MojoHandle;
-
-#define MOJO_HANDLE_INVALID ((MojoHandle)0)
-
-// |MojoHandleRights|: Rights ("permissions") for handles. Each handle has a
-// bitset of rights flags, which subsequently only be reduced. See each function
-// for details about the right(s) required (some, like |MojoClose()|, require no
-// rights).
-//   |MOJO_HANDLE_RIGHT_NONE| - No rights.
-//   |MOJO_HANDLE_RIGHT_DUPLICATE| - Right to duplicate a handle.
-//   |MOJO_HANDLE_RIGHT_TRANSFER| - Right to transfer a handle (e.g., include in
-//       a message).
-//   |MOJO_HANDLE_RIGHT_READ| - Right to "read" from the handle (e.g., read a
-//       message).
-//   |MOJO_HANDLE_RIGHT_WRITE| - Right to "write" to the handle (e.g., write a
-//       message).
-//   |MOJO_HANDLE_RIGHT_GET_OPTIONS| - Right to get a handle's options.
-//   |MOJO_HANDLE_RIGHT_SET_OPTIONS| - Right to set a handle's options.
-//   |MOJO_HANDLE_RIGHT_MAP_READABLE| - Right to "map" a (e.g., buffer) handle
-//       as readable memory.
-//   |MOJO_HANDLE_RIGHT_MAP_WRITABLE| - Right to "map" a (e.g., buffer) handle
-//       as writable memory.
-//   |MOJO_HANDLE_RIGHT_MAP_EXECUTABLE| - Right to "map" a (e.g., buffer) handle
-//       as executable memory.
-//
-// TODO(vtl): Add rights support/checking to existing handle types.
-
-typedef uint32_t MojoHandleRights;
-
-#define MOJO_HANDLE_RIGHT_NONE ((MojoHandleRights)0)
-#define MOJO_HANDLE_RIGHT_DUPLICATE ((MojoHandleRights)1 << 0)
-#define MOJO_HANDLE_RIGHT_TRANSFER ((MojoHandleRights)1 << 1)
-#define MOJO_HANDLE_RIGHT_READ ((MojoHandleRights)1 << 2)
-#define MOJO_HANDLE_RIGHT_WRITE ((MojoHandleRights)1 << 3)
-#define MOJO_HANDLE_RIGHT_GET_OPTIONS ((MojoHandleRights)1 << 4)
-#define MOJO_HANDLE_RIGHT_SET_OPTIONS ((MojoHandleRights)1 << 5)
-#define MOJO_HANDLE_RIGHT_MAP_READABLE ((MojoHandleRights)1 << 6)
-#define MOJO_HANDLE_RIGHT_MAP_WRITABLE ((MojoHandleRights)1 << 7)
-#define MOJO_HANDLE_RIGHT_MAP_EXECUTABLE ((MojoHandleRights)1 << 8)
-
-// |MojoHandleSignals|: Used to specify signals that can be waited on for a
-// handle (and which can be triggered), e.g., the ability to read or write to
-// the handle.
-//   |MOJO_HANDLE_SIGNAL_NONE| - No flags. |MojoWait()|, etc. will return
-//       |MOJO_RESULT_FAILED_PRECONDITION| if you attempt to wait on this.
-//   |MOJO_HANDLE_SIGNAL_READABLE| - Can read (e.g., a message) from the handle.
-//   |MOJO_HANDLE_SIGNAL_WRITABLE| - Can write (e.g., a message) to the handle.
-//   |MOJO_HANDLE_SIGNAL_PEER_CLOSED| - The peer handle is closed.
-//   |MOJO_HANDLE_SIGNAL_READ_THRESHOLD| - Can read a certain amount of data
-//       from the handle (e.g., a data pipe consumer; see
-//       |MojoDataPipeConsumerOptions|).
-
-typedef uint32_t MojoHandleSignals;
-
-#define MOJO_HANDLE_SIGNAL_NONE ((MojoHandleSignals)0)
-#define MOJO_HANDLE_SIGNAL_READABLE ((MojoHandleSignals)1 << 0)
-#define MOJO_HANDLE_SIGNAL_WRITABLE ((MojoHandleSignals)1 << 1)
-#define MOJO_HANDLE_SIGNAL_PEER_CLOSED ((MojoHandleSignals)1 << 2)
-#define MOJO_HANDLE_SIGNAL_READ_THRESHOLD ((MojoHandleSignals)1 << 3)
-#define MOJO_HANDLE_SIGNAL_WRITE_THRESHOLD ((MojoHandleSignals)1 << 4)
-
-// |MojoHandleSignalsState|: Returned by wait functions to indicate the
-// signaling state of handles. Members are as follows:
-//   - |satisfied signals|: Bitmask of signals that were satisfied at some time
-//         before the call returned.
-//   - |satisfiable signals|: These are the signals that are possible to
-//         satisfy. For example, if the return value was
-//         |MOJO_RESULT_FAILED_PRECONDITION|, you can use this field to
-//         determine which, if any, of the signals can still be satisfied.
-// Note: This struct is not extensible (and only has 32-bit quantities), so it's
-// 32-bit-aligned.
-
-MOJO_STATIC_ASSERT(MOJO_ALIGNOF(uint32_t) == 4, "uint32_t has weird alignment");
-struct MOJO_ALIGNAS(4) MojoHandleSignalsState {
-  MojoHandleSignals satisfied_signals;
-  MojoHandleSignals satisfiable_signals;
-};
-MOJO_STATIC_ASSERT(sizeof(struct MojoHandleSignalsState) == 8,
-                   "MojoHandleSignalsState has wrong size");
-
-MOJO_BEGIN_EXTERN_C
-
-// |MojoClose()|: Closes the given |handle|.
-//
-// Returns:
-//   |MOJO_RESULT_OK| on success.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle.
-//   |MOJO_RESULT_BUSY| if |handle| is currently in use in some transaction
-//       (that, e.g., may result in it being invalidated, such as being sent in
-//       a message).
-//
-// Concurrent operations on |handle| may succeed (or fail as usual) if they
-// happen before the close, be cancelled with result |MOJO_RESULT_CANCELLED| if
-// they properly overlap (this is likely the case with |MojoWait()|, etc.), or
-// fail with |MOJO_RESULT_INVALID_ARGUMENT| if they happen after.
-MojoResult MojoClose(MojoHandle handle);  // In.
-
-// |MojoGetRights()|: Gets the given |handle|'s rights.
-//
-// On success, |*rights| (|rights| must be non-null) will be set to |handle|'s
-// rights.
-//
-// Returns:
-//   |MOJO_RESULT_OK| on success.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle.
-//   |MOJO_RESULT_BUSY| if |handle| is currently in use in some transaction
-//       (that, e.g., may result in it being invalidated, such as being sent in
-//       a message).
-MojoResult MojoGetRights(MojoHandle handle, MojoHandleRights* rights);  // Out.
-
-// |MojoReplaceHandleWithReducedRights()|: Replaces |handle| with an equivalent
-// one with reduced rights.
-//
-// On success, |*replacement_handle| will be a handle that is equivalent to
-// |handle| (before the call), but with:
-//
-//   replacement handle rights = current rights & ~rights_to_remove.
-//
-// |handle| will be invalidated and any ongoing two-phase operations (e.g., for
-// data pipes) on |handle| will be aborted.
-//
-// On failure, |handle| will remain valid and unchanged (with any ongoing
-// two-phase operations undisturbed) and |*replacement_handle| will not be set.
-//
-// Note that it is not an error to "remove" rights that the handle does not
-// (currently) possess.
-//
-// Returns:
-//   |MOJO_RESULT_OK| on success.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle.
-//   |MOJO_RESULT_RESOURCE_EXHAUSTED| if a process/system/quota/etc. limit has
-//       been reached.
-//   |MOJO_RESULT_BUSY| if |handle| is currently in use in some transaction
-//       (that, e.g., may result in it being invalidated, such as being sent in
-//       a message).
-MojoResult MojoReplaceHandleWithReducedRights(
-    MojoHandle handle,
-    MojoHandleRights rights_to_remove,
-    MojoHandle* replacement_handle);  // Out.
-
-// |MojoDuplicateHandleWithReducedRights()|: Duplicates |handle| to a new handle
-// with reduced rights. This requires |handle| to have the
-// |MOJO_HANDLE_RIGHT_DUPLICATE| (note that some handle types may never have
-// this right).
-//
-// The rights for the new handle are determined as in
-// |MojoReplaceHandleWithReducedRights()|. That is, on success:
-//
-//   new handle rights = original handle rights & ~rights_to_remove.
-//
-// Returns:
-//   |MOJO_RESULT_OK| on success.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle.
-//   |MOJO_RESULT_PERMISSION_DENIED| if |handle| does not have the
-//       |MOJO_HANDLE_RIGHT_DUPLICATE| right.
-//   |MOJO_RESULT_RESOURCE_EXHAUSTED| if a process/system/quota/etc. limit has
-//       been reached.
-//   |MOJO_RESULT_BUSY| if |handle| is currently in use in some transaction
-//       (that, e.g., may result in it being invalidated, such as being sent in
-//       a message).
-MojoResult MojoDuplicateHandleWithReducedRights(
-    MojoHandle handle,
-    MojoHandleRights rights_to_remove,
-    MojoHandle* new_handle);  // Out.
-
-// |MojoDuplicateHandle()|: Duplicates |handle| to a new handle with equivalent
-// rights. This requires |handle| to have the |MOJO_HANDLE_RIGHT_DUPLICATE|.
-// This is equivalent to |MojoDuplicateHandleWithReducedRights(handle,
-// MOJO_HANDLE_RIGHT_NONE, new_handle)|.
-//
-// Returns:
-//   |MOJO_RESULT_OK| on success.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle.
-//   |MOJO_RESULT_PERMISSION_DENIED| if |handle| does not have the
-//       |MOJO_HANDLE_RIGHT_DUPLICATE| right.
-//   |MOJO_RESULT_RESOURCE_EXHAUSTED| if a process/system/quota/etc. limit has
-//       been reached.
-//   |MOJO_RESULT_BUSY| if |handle| is currently in use in some transaction
-//       (that, e.g., may result in it being invalidated, such as being sent in
-//       a message).
-MojoResult MojoDuplicateHandle(MojoHandle handle,
-                               MojoHandle* new_handle);  // Out.
-
-MOJO_END_EXTERN_C
-
-#endif  // MOJO_PUBLIC_C_INCLUDE_MOJO_SYSTEM_HANDLE_H_