bohu | f66a7ee | 2017-03-29 12:19:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #ifndef ANDROID_CORE_INCLUDE_QEMU_PIPE_H |
| 17 | #define ANDROID_CORE_INCLUDE_QEMU_PIPE_H |
| 18 | |
| 19 | #include <stddef.h> |
| 20 | |
| 21 | #ifdef __cplusplus |
| 22 | extern "C" { |
| 23 | #endif |
| 24 | // Try to open a new Qemu fast-pipe. This function returns a file descriptor |
| 25 | // that can be used to communicate with a named service managed by the |
| 26 | // emulator. |
| 27 | // |
| 28 | // This file descriptor can be used as a standard pipe/socket descriptor. |
| 29 | // |
| 30 | // 'pipeName' is the name of the emulator service you want to connect to, |
bohu | f868066 | 2017-03-29 12:19:56 -0700 | [diff] [blame^] | 31 | // and should begin with 'pipe:' (e.g. 'pipe:camera' or 'pipe:opengles'). |
| 32 | // For backward compatibility, the 'pipe:' prefix can be omitted, and in |
| 33 | // that case, qemu_pipe_open will add it for you. |
| 34 | |
bohu | f66a7ee | 2017-03-29 12:19:40 -0700 | [diff] [blame] | 35 | // On success, return a valid file descriptor, or -1/errno on failure. E.g.: |
| 36 | // |
| 37 | // EINVAL -> unknown/unsupported pipeName |
| 38 | // ENOSYS -> fast pipes not available in this system. |
| 39 | // |
| 40 | // ENOSYS should never happen, except if you're trying to run within a |
| 41 | // misconfigured emulator. |
| 42 | // |
| 43 | // You should be able to open several pipes to the same pipe service, |
| 44 | // except for a few special cases (e.g. GSM modem), where EBUSY will be |
| 45 | // returned if more than one client tries to connect to it. |
| 46 | int qemu_pipe_open(const char* pipeName); |
| 47 | |
| 48 | // Send a framed message |buff| of |len| bytes through the |fd| descriptor. |
| 49 | // This really adds a 4-hexchar prefix describing the payload size. |
| 50 | // Returns 0 on success, and -1 on error. |
| 51 | int qemu_pipe_frame_send(int fd, const void* buff, size_t len); |
| 52 | |
| 53 | // Read a frame message from |fd|, and store it into |buff| of |len| bytes. |
| 54 | // If the framed message is larger than |len|, then this returns -1 and the |
| 55 | // content is lost. Otherwise, this returns the size of the message. NOTE: |
| 56 | // empty messages are possible in a framed wire protocol and do not mean |
| 57 | // end-of-stream. |
| 58 | int qemu_pipe_frame_recv(int fd, void* buff, size_t len); |
| 59 | |
| 60 | #ifdef __cplusplus |
| 61 | } |
| 62 | #endif |
| 63 | |
| 64 | #endif /* ANDROID_CORE_INCLUDE_QEMU_PIPE_H */ |