1 /* 2 * Copyright 2006 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 17 #pragma once 18 19 #include <errno.h> 20 #include <stdbool.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <sys/socket.h> 25 26 #define ANDROID_SOCKET_ENV_PREFIX "ANDROID_SOCKET_" 27 #define ANDROID_SOCKET_DIR "/dev/socket" 28 29 /* 30 * osi_android_get_control_socket - simple helper function to get the file 31 * descriptor of our init-managed Unix domain socket. `name' is the name of the 32 * socket, as given in init.rc. Returns -1 on error. 33 * 34 * This is inline and not in libcutils proper because we want to use this in 35 * third-party daemons with minimal modification. 36 */ 37 static inline int osi_android_get_control_socket(const char* name) { 38 char key[64]; 39 snprintf(key, sizeof(key), ANDROID_SOCKET_ENV_PREFIX "%s", name); 40 41 const char* val = getenv(key); 42 if (!val) { 43 return -1; 44 } 45 46 errno = 0; 47 int fd = strtol(val, NULL, 10); 48 if (errno) { 49 return -1; 50 } 51 52 return fd; 53 } 54 55 /* 56 * See also android.os.LocalSocketAddress.Namespace 57 */ 58 // Linux "abstract" (non-filesystem) namespace 59 #define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0 60 // Android "reserved" (/dev/socket) namespace 61 #define ANDROID_SOCKET_NAMESPACE_RESERVED 1 62 // Normal filesystem namespace 63 #define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2 64 65 extern int osi_socket_local_server(const char* name, int namespaceId, int type); 66 extern int osi_socket_local_server_bind(int s, const char* name, 67 int namespaceId); 68 extern int osi_socket_local_client_connect(int fd, const char* name, 69 int namespaceId, int type); 70 extern int osi_socket_local_client(const char* name, int namespaceId, int type); 71
