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Diffstat (limited to 'qemu_pipe/qemu_pipe.cpp')
| -rw-r--r-- | qemu_pipe/qemu_pipe.cpp | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/qemu_pipe/qemu_pipe.cpp b/qemu_pipe/qemu_pipe.cpp deleted file mode 100644 index a4529deb8..000000000 --- a/qemu_pipe/qemu_pipe.cpp +++ /dev/null @@ -1,132 +0,0 @@ -/* - * 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 <unistd.h> -#include <fcntl.h> -#include <string.h> -#include <errno.h> -#include <stdio.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. -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. -int qemu_pipe_frame_send(int fd, const void* buff, size_t len) { - char header[5]; - snprintf(header, sizeof(header), "%04zx", 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. -int 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 != (ssize_t)size) { - QEMU_PIPE_DEBUG("Could not read qemud frame payload: %s", - strerror(errno)); - return -1; - } - return size; -} |