Merge \"[qemu]: Move qemu_pipe.h from include/system/ directory.\" (1c01bae8) · Commits · e / os / android_system_core

adb/transport_local.cpp

+7 −3

Original line number	Diff line number	Diff line
		@@ -240,16 +240,20 @@ static void server_socket_thread(void* arg) {
		/* This is relevant only for ADB daemon running inside the emulator. */
		/*
		* Redefine open and write for qemu_pipe.h that contains inlined references
		* to those routines. We will redifine them back after qemu_pipe.h inclusion.
		* to those routines. We will redefine them back after qemu_pipe.h inclusion.
		*/
		#undef open
		#undef read
		#undef write
		#define open adb_open
		#define read adb_read
		#define write adb_write
		#include <hardware/qemu_pipe.h>
		#include <system/qemu_pipe.h>
		#undef open
		#undef read
		#undef write
		#define open ___xxx_open
		#define read ___xxx_read
		#define write ___xxx_write

		/* A worker thread that monitors host connections, and registers a transport for
		@@ -297,7 +301,7 @@ static void qemu_socket_thread(void* arg) {
		D("transport: qemu_socket_thread() starting");

		/* adb QEMUD service connection request. */
		snprintf(con_name, sizeof(con_name), "qemud:adb:%d", port);
		snprintf(con_name, sizeof(con_name), "pipe:qemud:adb:%d", port);

		/* Connect to the adb QEMUD service. */
		fd = qemu_pipe_open(con_name);

include/system/qemu_pipe.h

0 → 100644

+134 −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_INCLUDE_SYSTEM_QEMU_PIPE_H
		#define ANDROID_INCLUDE_SYSTEM_QEMU_PIPE_H

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

		// 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

		// 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 must begin with 'pipe:' (e.g. 'pipe:camera' or 'pipe:opengles').
		//
		// 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.
		static __inline__ int qemu_pipe_open(const char* pipeName) {
		// Sanity check.
		if (!pipeName \|\| memcmp(pipeName, "pipe:", 5) != 0) {
		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);
		ssize_t ret = TEMP_FAILURE_RETRY(write(fd, pipeName, pipeNameLen + 1U));
		if (ret != (ssize_t)pipeNameLen + 1) {
		QEMU_PIPE_DEBUG("%s: Could not connect to %s pipe service: %s",
		__FUNCTION__, pipeName, strerror(errno));
		if (ret == 0) {
		errno = ECONNRESET;
		} else if (ret > 0) {
		errno = EINVAL;
		}
		return -1;
		}
		return fd;
		}

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

		// 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.
		static int __inline__ qemu_pipe_frame_recv(int fd, void* buff, size_t len) {
		char header[5];
		ssize_t ret = TEMP_FAILURE_RETRY(read(fd, header, 4));
		if (ret != 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;
		}
		ret = TEMP_FAILURE_RETRY(read(fd, buff, size));
		if (ret != size) {
		QEMU_PIPE_DEBUG("Could not read qemud frame payload: %s",
		strerror(errno));
		return -1;
		}
		return size;
		}

		#endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */