Merge "Move the qemu_pipe library into vhal_v2_0" am: de2b8f248e (e6f4bdcd) · Commits · e / os / android_hardware_interfaces

automotive/vehicle/2.0/default/Android.bp

+1 −1

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

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

+1 −1

Original line number	Diff line number	Diff line
		@@ -18,9 +18,9 @@

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

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

		#define CAR_SERVICE_NAME "pipe:qemud:car"

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

0 → 100644

+104 −0

Original line number	Diff line number	Diff line
		/*
		* 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

Original line number	Diff line number	Diff line
		/*
		* 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 */