453 lines
13 KiB
C
453 lines
13 KiB
C
/*
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* Copyright (C) 2008 Google, Inc.
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*
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* Based on, but no longer compatible with, the original
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* OpenBinder.org binder driver interface, which is:
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*
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* Copyright (c) 2005 Palmsource, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _UAPI_LINUX_BINDER_H
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#define _UAPI_LINUX_BINDER_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#define B_PACK_CHARS(c1, c2, c3, c4) \
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((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
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#define B_TYPE_LARGE 0x85
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enum {
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BINDER_TYPE_BINDER = B_PACK_CHARS('s', 'b', '*', B_TYPE_LARGE),
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BINDER_TYPE_WEAK_BINDER = B_PACK_CHARS('w', 'b', '*', B_TYPE_LARGE),
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BINDER_TYPE_HANDLE = B_PACK_CHARS('s', 'h', '*', B_TYPE_LARGE),
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BINDER_TYPE_WEAK_HANDLE = B_PACK_CHARS('w', 'h', '*', B_TYPE_LARGE),
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BINDER_TYPE_FD = B_PACK_CHARS('f', 'd', '*', B_TYPE_LARGE),
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BINDER_TYPE_FDA = B_PACK_CHARS('f', 'd', 'a', B_TYPE_LARGE),
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BINDER_TYPE_PTR = B_PACK_CHARS('p', 't', '*', B_TYPE_LARGE),
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};
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enum {
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FLAT_BINDER_FLAG_PRIORITY_MASK = 0xff,
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FLAT_BINDER_FLAG_ACCEPTS_FDS = 0x100,
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};
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#ifdef BINDER_IPC_32BIT
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typedef __u32 binder_size_t;
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typedef __u32 binder_uintptr_t;
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#else
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typedef __u64 binder_size_t;
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typedef __u64 binder_uintptr_t;
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#endif
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/**
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* struct binder_object_header - header shared by all binder metadata objects.
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* @type: type of the object
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*/
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struct binder_object_header {
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__u32 type;
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};
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/*
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* This is the flattened representation of a Binder object for transfer
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* between processes. The 'offsets' supplied as part of a binder transaction
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* contains offsets into the data where these structures occur. The Binder
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* driver takes care of re-writing the structure type and data as it moves
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* between processes.
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*/
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struct flat_binder_object {
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struct binder_object_header hdr;
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__u32 flags;
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/* 8 bytes of data. */
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union {
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binder_uintptr_t binder; /* local object */
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__u32 handle; /* remote object */
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};
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/* extra data associated with local object */
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binder_uintptr_t cookie;
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};
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/**
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* struct binder_fd_object - describes a filedescriptor to be fixed up.
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* @hdr: common header structure
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* @pad_flags: padding to remain compatible with old userspace code
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* @pad_binder: padding to remain compatible with old userspace code
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* @fd: file descriptor
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* @cookie: opaque data, used by user-space
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*/
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struct binder_fd_object {
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struct binder_object_header hdr;
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__u32 pad_flags;
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union {
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binder_uintptr_t pad_binder;
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__u32 fd;
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};
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binder_uintptr_t cookie;
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};
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/* struct binder_buffer_object - object describing a userspace buffer
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* @hdr: common header structure
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* @flags: one or more BINDER_BUFFER_* flags
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* @buffer: address of the buffer
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* @length: length of the buffer
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* @parent: index in offset array pointing to parent buffer
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* @parent_offset: offset in @parent pointing to this buffer
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*
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* A binder_buffer object represents an object that the
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* binder kernel driver can copy verbatim to the target
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* address space. A buffer itself may be pointed to from
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* within another buffer, meaning that the pointer inside
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* that other buffer needs to be fixed up as well. This
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* can be done by setting the BINDER_BUFFER_FLAG_HAS_PARENT
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* flag in @flags, by setting @parent buffer to the index
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* in the offset array pointing to the parent binder_buffer_object,
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* and by setting @parent_offset to the offset in the parent buffer
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* at which the pointer to this buffer is located.
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*/
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struct binder_buffer_object {
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struct binder_object_header hdr;
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__u32 flags;
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binder_uintptr_t buffer;
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binder_size_t length;
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binder_size_t parent;
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binder_size_t parent_offset;
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};
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enum {
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BINDER_BUFFER_FLAG_HAS_PARENT = 0x01,
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};
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/* struct binder_fd_array_object - object describing an array of fds in a buffer
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* @hdr: common header structure
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* @pad: padding to ensure correct alignment
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* @num_fds: number of file descriptors in the buffer
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* @parent: index in offset array to buffer holding the fd array
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* @parent_offset: start offset of fd array in the buffer
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*
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* A binder_fd_array object represents an array of file
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* descriptors embedded in a binder_buffer_object. It is
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* different from a regular binder_buffer_object because it
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* describes a list of file descriptors to fix up, not an opaque
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* blob of memory, and hence the kernel needs to treat it differently.
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*
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* An example of how this would be used is with Android's
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* native_handle_t object, which is a struct with a list of integers
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* and a list of file descriptors. The native_handle_t struct itself
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* will be represented by a struct binder_buffer_objct, whereas the
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* embedded list of file descriptors is represented by a
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* struct binder_fd_array_object with that binder_buffer_object as
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* a parent.
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*/
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struct binder_fd_array_object {
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struct binder_object_header hdr;
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__u32 pad;
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binder_size_t num_fds;
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binder_size_t parent;
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binder_size_t parent_offset;
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};
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/*
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* On 64-bit platforms where user code may run in 32-bits the driver must
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* translate the buffer (and local binder) addresses appropriately.
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*/
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struct binder_write_read {
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binder_size_t write_size; /* bytes to write */
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binder_size_t write_consumed; /* bytes consumed by driver */
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binder_uintptr_t write_buffer;
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binder_size_t read_size; /* bytes to read */
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binder_size_t read_consumed; /* bytes consumed by driver */
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binder_uintptr_t read_buffer;
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};
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/* Use with BINDER_VERSION, driver fills in fields. */
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struct binder_version {
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/* driver protocol version -- increment with incompatible change */
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__s32 protocol_version;
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};
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/* This is the current protocol version. */
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#ifdef BINDER_IPC_32BIT
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#define BINDER_CURRENT_PROTOCOL_VERSION 7
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#else
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#define BINDER_CURRENT_PROTOCOL_VERSION 8
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#endif
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#define BINDER_WRITE_READ _IOWR('b', 1, struct binder_write_read)
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#define BINDER_SET_IDLE_TIMEOUT _IOW('b', 3, __s64)
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#define BINDER_SET_MAX_THREADS _IOW('b', 5, __u32)
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#define BINDER_SET_IDLE_PRIORITY _IOW('b', 6, __s32)
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#define BINDER_SET_CONTEXT_MGR _IOW('b', 7, __s32)
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#define BINDER_THREAD_EXIT _IOW('b', 8, __s32)
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#define BINDER_VERSION _IOWR('b', 9, struct binder_version)
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/*
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* NOTE: Two special error codes you should check for when calling
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* in to the driver are:
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*
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* EINTR -- The operation has been interupted. This should be
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* handled by retrying the ioctl() until a different error code
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* is returned.
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*
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* ECONNREFUSED -- The driver is no longer accepting operations
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* from your process. That is, the process is being destroyed.
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* You should handle this by exiting from your process. Note
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* that once this error code is returned, all further calls to
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* the driver from any thread will return this same code.
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*/
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enum transaction_flags {
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TF_ONE_WAY = 0x01, /* this is a one-way call: async, no return */
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TF_ROOT_OBJECT = 0x04, /* contents are the component's root object */
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TF_STATUS_CODE = 0x08, /* contents are a 32-bit status code */
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TF_ACCEPT_FDS = 0x10, /* allow replies with file descriptors */
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};
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struct binder_transaction_data {
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/* The first two are only used for bcTRANSACTION and brTRANSACTION,
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* identifying the target and contents of the transaction.
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*/
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union {
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/* target descriptor of command transaction */
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__u32 handle;
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/* target descriptor of return transaction */
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binder_uintptr_t ptr;
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} target;
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binder_uintptr_t cookie; /* target object cookie */
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__u32 code; /* transaction command */
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/* General information about the transaction. */
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__u32 flags;
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pid_t sender_pid;
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uid_t sender_euid;
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binder_size_t data_size; /* number of bytes of data */
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binder_size_t offsets_size; /* number of bytes of offsets */
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/* If this transaction is inline, the data immediately
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* follows here; otherwise, it ends with a pointer to
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* the data buffer.
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*/
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union {
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struct {
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/* transaction data */
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binder_uintptr_t buffer;
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/* offsets from buffer to flat_binder_object structs */
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binder_uintptr_t offsets;
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} ptr;
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__u8 buf[8];
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} data;
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};
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struct binder_transaction_data_sg {
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struct binder_transaction_data transaction_data;
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binder_size_t buffers_size;
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};
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struct binder_ptr_cookie {
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binder_uintptr_t ptr;
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binder_uintptr_t cookie;
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};
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struct binder_handle_cookie {
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__u32 handle;
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binder_uintptr_t cookie;
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} __packed;
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struct binder_pri_desc {
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__s32 priority;
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__u32 desc;
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};
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struct binder_pri_ptr_cookie {
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__s32 priority;
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binder_uintptr_t ptr;
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binder_uintptr_t cookie;
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};
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enum binder_driver_return_protocol {
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BR_ERROR = _IOR('r', 0, __s32),
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/*
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* int: error code
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*/
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BR_OK = _IO('r', 1),
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/* No parameters! */
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BR_TRANSACTION = _IOR('r', 2, struct binder_transaction_data),
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BR_REPLY = _IOR('r', 3, struct binder_transaction_data),
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/*
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* binder_transaction_data: the received command.
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*/
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BR_ACQUIRE_RESULT = _IOR('r', 4, __s32),
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/*
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* not currently supported
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* int: 0 if the last bcATTEMPT_ACQUIRE was not successful.
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* Else the remote object has acquired a primary reference.
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*/
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BR_DEAD_REPLY = _IO('r', 5),
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/*
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* The target of the last transaction (either a bcTRANSACTION or
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* a bcATTEMPT_ACQUIRE) is no longer with us. No parameters.
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*/
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BR_TRANSACTION_COMPLETE = _IO('r', 6),
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/*
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* No parameters... always refers to the last transaction requested
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* (including replies). Note that this will be sent even for
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* asynchronous transactions.
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*/
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BR_INCREFS = _IOR('r', 7, struct binder_ptr_cookie),
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BR_ACQUIRE = _IOR('r', 8, struct binder_ptr_cookie),
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BR_RELEASE = _IOR('r', 9, struct binder_ptr_cookie),
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BR_DECREFS = _IOR('r', 10, struct binder_ptr_cookie),
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/*
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* void *: ptr to binder
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* void *: cookie for binder
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*/
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BR_ATTEMPT_ACQUIRE = _IOR('r', 11, struct binder_pri_ptr_cookie),
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/*
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* not currently supported
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* int: priority
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* void *: ptr to binder
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* void *: cookie for binder
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*/
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BR_NOOP = _IO('r', 12),
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/*
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* No parameters. Do nothing and examine the next command. It exists
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* primarily so that we can replace it with a BR_SPAWN_LOOPER command.
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*/
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BR_SPAWN_LOOPER = _IO('r', 13),
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/*
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* No parameters. The driver has determined that a process has no
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* threads waiting to service incoming transactions. When a process
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* receives this command, it must spawn a new service thread and
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* register it via bcENTER_LOOPER.
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*/
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BR_FINISHED = _IO('r', 14),
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/*
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* not currently supported
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* stop threadpool thread
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*/
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BR_DEAD_BINDER = _IOR('r', 15, binder_uintptr_t),
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/*
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* void *: cookie
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*/
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BR_CLEAR_DEATH_NOTIFICATION_DONE = _IOR('r', 16, binder_uintptr_t),
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/*
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* void *: cookie
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*/
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BR_FAILED_REPLY = _IO('r', 17),
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/*
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* The the last transaction (either a bcTRANSACTION or
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* a bcATTEMPT_ACQUIRE) failed (e.g. out of memory). No parameters.
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*/
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};
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enum binder_driver_command_protocol {
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BC_TRANSACTION = _IOW('c', 0, struct binder_transaction_data),
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BC_REPLY = _IOW('c', 1, struct binder_transaction_data),
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/*
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* binder_transaction_data: the sent command.
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*/
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BC_ACQUIRE_RESULT = _IOW('c', 2, __s32),
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/*
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* not currently supported
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* int: 0 if the last BR_ATTEMPT_ACQUIRE was not successful.
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* Else you have acquired a primary reference on the object.
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*/
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BC_FREE_BUFFER = _IOW('c', 3, binder_uintptr_t),
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/*
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* void *: ptr to transaction data received on a read
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*/
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BC_INCREFS = _IOW('c', 4, __u32),
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BC_ACQUIRE = _IOW('c', 5, __u32),
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BC_RELEASE = _IOW('c', 6, __u32),
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BC_DECREFS = _IOW('c', 7, __u32),
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/*
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* int: descriptor
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*/
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BC_INCREFS_DONE = _IOW('c', 8, struct binder_ptr_cookie),
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BC_ACQUIRE_DONE = _IOW('c', 9, struct binder_ptr_cookie),
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/*
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* void *: ptr to binder
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* void *: cookie for binder
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*/
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BC_ATTEMPT_ACQUIRE = _IOW('c', 10, struct binder_pri_desc),
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/*
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* not currently supported
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* int: priority
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* int: descriptor
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*/
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BC_REGISTER_LOOPER = _IO('c', 11),
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/*
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* No parameters.
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* Register a spawned looper thread with the device.
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*/
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BC_ENTER_LOOPER = _IO('c', 12),
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BC_EXIT_LOOPER = _IO('c', 13),
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/*
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* No parameters.
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* These two commands are sent as an application-level thread
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* enters and exits the binder loop, respectively. They are
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* used so the binder can have an accurate count of the number
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* of looping threads it has available.
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*/
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BC_REQUEST_DEATH_NOTIFICATION = _IOW('c', 14,
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struct binder_handle_cookie),
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/*
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* int: handle
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* void *: cookie
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*/
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BC_CLEAR_DEATH_NOTIFICATION = _IOW('c', 15,
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struct binder_handle_cookie),
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/*
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* int: handle
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* void *: cookie
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*/
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BC_DEAD_BINDER_DONE = _IOW('c', 16, binder_uintptr_t),
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/*
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* void *: cookie
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*/
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BC_TRANSACTION_SG = _IOW('c', 17, struct binder_transaction_data_sg),
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BC_REPLY_SG = _IOW('c', 18, struct binder_transaction_data_sg),
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/*
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* binder_transaction_data_sg: the sent command.
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*/
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};
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#endif /* _UAPI_LINUX_BINDER_H */
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