blob: 53aec97a083dde5f8d145c070652d2b7d8f71b47
| 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_INCLUDE_HARDWARE_QEMU_PIPE_H |
| 17 | #define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H |
| 18 | |
| 19 | #include <sys/cdefs.h> |
| 20 | #include <unistd.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <sys/mman.h> |
| 23 | #include <pthread.h> /* for pthread_once() */ |
| 24 | #include <stdlib.h> |
| 25 | #include <stdio.h> |
| 26 | #include <string.h> |
| 27 | #include <errno.h> |
| 28 | |
| 29 | #ifndef D |
| 30 | # define D(...) do{}while(0) |
| 31 | #endif |
| 32 | |
| 33 | /* Try to open a new Qemu fast-pipe. This function returns a file descriptor |
| 34 | * that can be used to communicate with a named service managed by the |
| 35 | * emulator. |
| 36 | * |
| 37 | * This file descriptor can be used as a standard pipe/socket descriptor. |
| 38 | * |
| 39 | * 'pipeName' is the name of the emulator service you want to connect to. |
| 40 | * E.g. 'opengles' or 'camera'. |
| 41 | * |
| 42 | * On success, return a valid file descriptor |
| 43 | * Returns -1 on error, and errno gives the error code, e.g.: |
| 44 | * |
| 45 | * EINVAL -> unknown/unsupported pipeName |
| 46 | * ENOSYS -> fast pipes not available in this system. |
| 47 | * |
| 48 | * ENOSYS should never happen, except if you're trying to run within a |
| 49 | * misconfigured emulator. |
| 50 | * |
| 51 | * You should be able to open several pipes to the same pipe service, |
| 52 | * except for a few special cases (e.g. GSM modem), where EBUSY will be |
| 53 | * returned if more than one client tries to connect to it. |
| 54 | */ |
| 55 | static __inline__ int |
| 56 | qemu_pipe_open(const char* pipeName) |
| 57 | { |
| 58 | char buff[256]; |
| 59 | int buffLen; |
| 60 | int fd, ret; |
| 61 | |
| 62 | if (pipeName == NULL || pipeName[0] == '\0') { |
| 63 | errno = EINVAL; |
| 64 | return -1; |
| 65 | } |
| 66 | |
| 67 | snprintf(buff, sizeof buff, "pipe:%s", pipeName); |
| 68 | |
| 69 | fd = open("/dev/qemu_pipe", O_RDWR); |
| 70 | if (fd < 0 && errno == ENOENT) |
| 71 | fd = open("/dev/goldfish_pipe", O_RDWR); |
| 72 | if (fd < 0) { |
| 73 | D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno)); |
| 74 | //errno = ENOSYS; |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | buffLen = strlen(buff); |
| 79 | |
| 80 | ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1)); |
| 81 | if (ret != buffLen+1) { |
| 82 | D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno)); |
| 83 | if (ret == 0) { |
| 84 | errno = ECONNRESET; |
| 85 | } else if (ret > 0) { |
| 86 | errno = EINVAL; |
| 87 | } |
| 88 | return -1; |
| 89 | } |
| 90 | |
| 91 | return fd; |
| 92 | } |
| 93 | |
| 94 | #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */ |
| 95 |