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