keunyoung | b85b275 | 2013-03-08 12:28:03 -0800 | [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 | #include "Win32PipeStream.h" |
| 17 | |
| 18 | #include <errno.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <unistd.h> |
| 22 | #include <string.h> |
| 23 | #include <windows.h> |
| 24 | |
| 25 | #ifndef _WIN32 |
| 26 | #error ONLY BUILD THIS SOURCE FILE FOR WINDOWS! |
| 27 | #endif |
| 28 | |
| 29 | /* The official documentation states that the name of a given named |
| 30 | * pipe cannot be more than 256 characters long. |
| 31 | */ |
| 32 | #define NAMED_PIPE_MAX 256 |
| 33 | |
| 34 | Win32PipeStream::Win32PipeStream(size_t bufSize) : |
| 35 | SocketStream(bufSize), |
| 36 | m_pipe(INVALID_HANDLE_VALUE) |
| 37 | { |
| 38 | } |
| 39 | |
| 40 | Win32PipeStream::Win32PipeStream(HANDLE pipe, size_t bufSize) : |
| 41 | SocketStream(-1, bufSize), |
| 42 | m_pipe(pipe) |
| 43 | { |
| 44 | } |
| 45 | |
| 46 | Win32PipeStream::~Win32PipeStream() |
| 47 | { |
| 48 | if (m_pipe != INVALID_HANDLE_VALUE) { |
| 49 | CloseHandle(m_pipe); |
| 50 | m_pipe = INVALID_HANDLE_VALUE; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /* Initialize the pipe name corresponding to a given port |
| 55 | */ |
| 56 | static void |
| 57 | make_pipe_name(char *path, size_t pathlen, int port_number) |
| 58 | { |
| 59 | snprintf(path, pathlen, "\\\\.\\pipe\\qemu-gles-%d", port_number); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | /* Technical note: Named pipes work differently from BSD Sockets. |
| 64 | * One does not create/bind a pipe, and collect a new handle each |
| 65 | * time a client connects with accept(). |
| 66 | * |
| 67 | * Instead, the server creates a new pipe instance each time it wants |
| 68 | * to get a new client connection, then calls ConnectNamedPipe() to |
| 69 | * wait for a connection. |
| 70 | * |
| 71 | * So listen() is a no-op, and accept() really creates the pipe handle. |
| 72 | * |
| 73 | * Also, connect() must create a pipe handle with CreateFile() and |
| 74 | * wait for a server instance with WaitNamedPipe() |
| 75 | */ |
| 76 | int Win32PipeStream::listen(unsigned short port) |
| 77 | { |
| 78 | // just save the port number for accept() |
| 79 | m_port = port; |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | SocketStream * Win32PipeStream::accept() |
| 84 | { |
| 85 | char path[NAMED_PIPE_MAX+1]; |
| 86 | SocketStream* clientStream; |
| 87 | HANDLE pipe; |
| 88 | |
| 89 | make_pipe_name(path, sizeof(path), m_port); |
| 90 | |
| 91 | pipe = ::CreateNamedPipe( |
| 92 | path, // pipe name |
| 93 | PIPE_ACCESS_DUPLEX, // read-write access |
| 94 | PIPE_TYPE_BYTE | // byte-oriented writes |
| 95 | PIPE_READMODE_BYTE | // byte-oriented reads |
| 96 | PIPE_WAIT, // blocking operations |
| 97 | PIPE_UNLIMITED_INSTANCES, // no limit on clients |
| 98 | 4096, // input buffer size |
| 99 | 4096, // output buffer size |
| 100 | 0, // client time-out |
| 101 | NULL); // default security attributes |
| 102 | |
| 103 | if (pipe == INVALID_HANDLE_VALUE) { |
| 104 | ERR("%s: CreateNamedPipe failed %d\n", __FUNCTION__, (int)GetLastError()); |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | // Stupid Win32 API design: If a client is already connected, then |
| 109 | // ConnectNamedPipe will return 0, and GetLastError() will return |
| 110 | // ERROR_PIPE_CONNECTED. This is not an error! It just means that the |
| 111 | // function didn't have to wait. |
| 112 | // |
| 113 | if (::ConnectNamedPipe(pipe, NULL) == 0 && GetLastError() != ERROR_PIPE_CONNECTED) { |
| 114 | ERR("%s: ConnectNamedPipe failed: %d\n", __FUNCTION__, (int)GetLastError()); |
| 115 | CloseHandle(pipe); |
| 116 | return NULL; |
| 117 | } |
| 118 | |
| 119 | clientStream = new Win32PipeStream(pipe, m_bufsize); |
| 120 | return clientStream; |
| 121 | } |
| 122 | |
| 123 | int Win32PipeStream::connect(unsigned short port) |
| 124 | { |
| 125 | char path[NAMED_PIPE_MAX+1]; |
| 126 | HANDLE pipe; |
| 127 | int tries = 10; |
| 128 | |
| 129 | make_pipe_name(path, sizeof(path), port); |
| 130 | |
| 131 | /* We're going to loop in order to wait for the pipe server to |
| 132 | * be setup properly. |
| 133 | */ |
| 134 | for (; tries > 0; tries--) { |
| 135 | pipe = ::CreateFile( |
| 136 | path, // pipe name |
| 137 | GENERIC_READ | GENERIC_WRITE, // read & write |
| 138 | 0, // no sharing |
| 139 | NULL, // default security attrs |
| 140 | OPEN_EXISTING, // open existing pipe |
| 141 | 0, // default attributes |
| 142 | NULL); // no template file |
| 143 | |
| 144 | /* If we have a valid pipe handle, break from the loop */ |
| 145 | if (pipe != INVALID_HANDLE_VALUE) { |
| 146 | break; |
| 147 | } |
| 148 | |
| 149 | /* We can get here if the pipe is busy, i.e. if the server hasn't |
| 150 | * create a new pipe instance to service our request. In which case |
| 151 | * GetLastError() will return ERROR_PIPE_BUSY. |
| 152 | * |
| 153 | * If so, then use WaitNamedPipe() to wait for a decent time |
| 154 | * to try again. |
| 155 | */ |
| 156 | if (GetLastError() != ERROR_PIPE_BUSY) { |
| 157 | /* Not ERROR_PIPE_BUSY */ |
| 158 | ERR("%s: CreateFile failed: %d\n", __FUNCTION__, (int)GetLastError()); |
| 159 | errno = EINVAL; |
| 160 | return -1; |
| 161 | } |
| 162 | |
| 163 | /* Wait for 5 seconds */ |
| 164 | if ( !WaitNamedPipe(path, 5000) ) { |
| 165 | ERR("%s: WaitNamedPipe failed: %d\n", __FUNCTION__, (int)GetLastError()); |
| 166 | errno = EINVAL; |
| 167 | return -1; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | m_pipe = pipe; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | /* Special buffer methods, since we can't use socket functions here */ |
| 176 | |
| 177 | int Win32PipeStream::commitBuffer(size_t size) |
| 178 | { |
| 179 | if (m_pipe == INVALID_HANDLE_VALUE) |
| 180 | return -1; |
| 181 | |
| 182 | size_t res = size; |
| 183 | int retval = 0; |
| 184 | |
| 185 | while (res > 0) { |
| 186 | DWORD written; |
| 187 | if (! ::WriteFile(m_pipe, (const char *)m_buf + (size - res), res, &written, NULL)) { |
| 188 | retval = -1; |
| 189 | ERR("%s: failed: %d\n", __FUNCTION__, (int)GetLastError()); |
| 190 | break; |
| 191 | } |
| 192 | res -= written; |
| 193 | } |
| 194 | return retval; |
| 195 | } |
| 196 | |
| 197 | const unsigned char *Win32PipeStream::readFully(void *buf, size_t len) |
| 198 | { |
| 199 | const unsigned char* ret = NULL; |
| 200 | |
| 201 | if (m_pipe == INVALID_HANDLE_VALUE) |
| 202 | return NULL; |
| 203 | |
| 204 | if (!buf) { |
| 205 | return NULL; // do not allow NULL buf in that implementation |
| 206 | } |
| 207 | |
| 208 | size_t res = len; |
| 209 | while (res > 0) { |
| 210 | DWORD readcount = 0; |
| 211 | if (! ::ReadFile(m_pipe, (char *)buf + (len - res), res, &readcount, NULL) || readcount == 0) { |
| 212 | errno = (int)GetLastError(); |
| 213 | return NULL; |
| 214 | } |
| 215 | res -= readcount; |
| 216 | } |
| 217 | return (const unsigned char *)buf; |
| 218 | } |
| 219 | |
| 220 | const unsigned char *Win32PipeStream::read( void *buf, size_t *inout_len) |
| 221 | { |
| 222 | size_t len = *inout_len; |
| 223 | DWORD readcount; |
| 224 | |
| 225 | if (m_pipe == INVALID_HANDLE_VALUE) |
| 226 | return NULL; |
| 227 | |
| 228 | if (!buf) { |
| 229 | return NULL; // do not allow NULL buf in that implementation |
| 230 | } |
| 231 | |
| 232 | if (!::ReadFile(m_pipe, (char *)buf, len, &readcount, NULL)) { |
| 233 | errno = (int)GetLastError(); |
| 234 | return NULL; |
| 235 | } |
| 236 | |
| 237 | *inout_len = (size_t)readcount; |
| 238 | return (const unsigned char *)buf; |
| 239 | } |