Move the qemu_pipe library into vhal_v2_0 (4e370a4b) · Commits · e / os / android_hardware_interfaces

automotive/vehicle/2.0/default/Android.bp

+1 −1

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	@@ -91,13 +91,13 @@ cc_library_static {
	"impl/vhal_v2_0/LinearFakeValueGenerator.cpp",		"impl/vhal_v2_0/LinearFakeValueGenerator.cpp",
	"impl/vhal_v2_0/JsonFakeValueGenerator.cpp",		"impl/vhal_v2_0/JsonFakeValueGenerator.cpp",
	"impl/vhal_v2_0/GeneratorHub.cpp",		"impl/vhal_v2_0/GeneratorHub.cpp",
			"impl/vhal_v2_0/qemu_pipe.cpp",
	],		],
	local_include_dirs: ["common/include/vhal_v2_0"],		local_include_dirs: ["common/include/vhal_v2_0"],
	export_include_dirs: ["impl"],		export_include_dirs: ["impl"],
	whole_static_libs: [		whole_static_libs: [
	"android.hardware.automotive.vehicle@2.0-emulated-user-hal-lib",		"android.hardware.automotive.vehicle@2.0-emulated-user-hal-lib",
	"android.hardware.automotive.vehicle@2.0-manager-lib",		"android.hardware.automotive.vehicle@2.0-manager-lib",
	"libqemu_pipe",
	],		],
	shared_libs: [		shared_libs: [
	"libbase",		"libbase",

automotive/vehicle/2.0/default/impl/vhal_v2_0/PipeComm.cpp

+1 −1

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	@@ -18,9 +18,9 @@

	#include <android/hardware/automotive/vehicle/2.0/IVehicle.h>		#include <android/hardware/automotive/vehicle/2.0/IVehicle.h>
	#include <log/log.h>		#include <log/log.h>
	#include <qemu_pipe.h>

	#include "PipeComm.h"		#include "PipeComm.h"
			#include "qemu_pipe.h"

	#define CAR_SERVICE_NAME "pipe:qemud:car"		#define CAR_SERVICE_NAME "pipe:qemud:car"

automotive/vehicle/2.0/default/impl/vhal_v2_0/qemu_pipe.cpp

0 → 100644

+104 −0

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			/*
			* Copyright (C) 2011 The Android Open Source Project
			*
			* Licensed under the Apache License, Version 2.0 (the "License");
			* you may not use this file except in compliance with the License.
			* You may obtain a copy of the License at
			*
			* http://www.apache.org/licenses/LICENSE-2.0
			*
			* Unless required by applicable law or agreed to in writing, software
			* distributed under the License is distributed on an "AS IS" BASIS,
			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
			* See the License for the specific language governing permissions and
			* limitations under the License.
			*/

			#include "qemu_pipe.h"

			#include <errno.h>
			#include <fcntl.h>
			#include <stdio.h>
			#include <string.h>
			#include <unistd.h>

			#include <android-base/file.h>

			using android::base::ReadFully;
			using android::base::WriteFully;

			// Define QEMU_PIPE_DEBUG if you want to print error messages when an error
			// occurs during pipe operations. The macro should simply take a printf-style
			// formatting string followed by optional arguments.
			#ifndef QEMU_PIPE_DEBUG
			#define QEMU_PIPE_DEBUG(...) (void)0
			#endif

			int qemu_pipe_open(const char* pipeName) {
			if (!pipeName) {
			errno = EINVAL;
			return -1;
			}

			int fd = TEMP_FAILURE_RETRY(open("/dev/qemu_pipe", O_RDWR));
			if (fd < 0) {
			QEMU_PIPE_DEBUG("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
			return -1;
			}

			// Write the pipe name, including the trailing zero which is necessary.
			size_t pipeNameLen = strlen(pipeName);
			if (WriteFully(fd, pipeName, pipeNameLen + 1U)) {
			return fd;
			}

			// now, add 'pipe:' prefix and try again
			// Note: host side will wait for the trailing '\0' to start
			// service lookup.
			const char pipe_prefix[] = "pipe:";
			if (WriteFully(fd, pipe_prefix, strlen(pipe_prefix)) &&
			WriteFully(fd, pipeName, pipeNameLen + 1U)) {
			return fd;
			}
			QEMU_PIPE_DEBUG("%s: Could not write to %s pipe service: %s", __FUNCTION__, pipeName,
			strerror(errno));
			close(fd);
			return -1;
			}

			int qemu_pipe_frame_send(int fd, const void* buff, size_t len) {
			char header[5];
			snprintf(header, sizeof(header), "%04zx", len);
			if (!WriteFully(fd, header, 4)) {
			QEMU_PIPE_DEBUG("Can't write qemud frame header: %s", strerror(errno));
			return -1;
			}
			if (!WriteFully(fd, buff, len)) {
			QEMU_PIPE_DEBUG("Can't write qemud frame payload: %s", strerror(errno));
			return -1;
			}
			return 0;
			}

			int qemu_pipe_frame_recv(int fd, void* buff, size_t len) {
			char header[5];
			if (!ReadFully(fd, header, 4)) {
			QEMU_PIPE_DEBUG("Can't read qemud frame header: %s", strerror(errno));
			return -1;
			}
			header[4] = '\0';
			size_t size;
			if (sscanf(header, "%04zx", &size) != 1) {
			QEMU_PIPE_DEBUG("Malformed qemud frame header: [%.*s]", 4, header);
			return -1;
			}
			if (size > len) {
			QEMU_PIPE_DEBUG("Oversized qemud frame (% bytes, expected <= %)", size, len);
			return -1;
			}
			if (!ReadFully(fd, buff, size)) {
			QEMU_PIPE_DEBUG("Could not read qemud frame payload: %s", strerror(errno));
			return -1;
			}
			return size;
			}

automotive/vehicle/2.0/default/impl/vhal_v2_0/qemu_pipe.h

0 → 100644

+64 −0

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			/*
			* Copyright (C) 2011 The Android Open Source Project
			*
			* Licensed under the Apache License, Version 2.0 (the "License");
			* you may not use this file except in compliance with the License.
			* You may obtain a copy of the License at
			*
			* http://www.apache.org/licenses/LICENSE-2.0
			*
			* Unless required by applicable law or agreed to in writing, software
			* distributed under the License is distributed on an "AS IS" BASIS,
			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
			* See the License for the specific language governing permissions and
			* limitations under the License.
			*/
			#ifndef ANDROID_CORE_INCLUDE_QEMU_PIPE_H
			#define ANDROID_CORE_INCLUDE_QEMU_PIPE_H

			#include <stddef.h>

			#ifdef __cplusplus
			extern "C" {
			#endif
			// Try to open a new Qemu fast-pipe. This function returns a file descriptor
			// that can be used to communicate with a named service managed by the
			// emulator.
			//
			// This file descriptor can be used as a standard pipe/socket descriptor.
			//
			// 'pipeName' is the name of the emulator service you want to connect to,
			// and should begin with 'pipe:' (e.g. 'pipe:camera' or 'pipe:opengles').
			// For backward compatibility, the 'pipe:' prefix can be omitted, and in
			// that case, qemu_pipe_open will add it for you.

			// On success, return a valid file descriptor, or -1/errno on failure. E.g.:
			//
			// EINVAL -> unknown/unsupported pipeName
			// ENOSYS -> fast pipes not available in this system.
			//
			// ENOSYS should never happen, except if you're trying to run within a
			// misconfigured emulator.
			//
			// You should be able to open several pipes to the same pipe service,
			// except for a few special cases (e.g. GSM modem), where EBUSY will be
			// returned if more than one client tries to connect to it.
			int qemu_pipe_open(const char* pipeName);

			// Send a framed message \|buff\| of \|len\| bytes through the \|fd\| descriptor.
			// This really adds a 4-hexchar prefix describing the payload size.
			// Returns 0 on success, and -1 on error.
			int qemu_pipe_frame_send(int fd, const void* buff, size_t len);

			// Read a frame message from \|fd\|, and store it into \|buff\| of \|len\| bytes.
			// If the framed message is larger than \|len\|, then this returns -1 and the
			// content is lost. Otherwise, this returns the size of the message. NOTE:
			// empty messages are possible in a framed wire protocol and do not mean
			// end-of-stream.
			int qemu_pipe_frame_recv(int fd, void* buff, size_t len);

			#ifdef __cplusplus
			}
			#endif

			#endif /* ANDROID_CORE_INCLUDE_QEMU_PIPE_H */