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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/sync_socket.h" | |
| 6 | |
| 7 #include <errno.h> | |
| 8 #include <fcntl.h> | |
| 9 #include <limits.h> | |
| 10 #include <stdio.h> | |
| 11 #include <sys/ioctl.h> | |
| 12 #include <sys/socket.h> | |
| 13 #include <sys/types.h> | |
| 14 | |
| 15 #if defined(OS_SOLARIS) | |
| 16 #include <sys/filio.h> | |
| 17 #endif | |
| 18 | |
| 19 #include "base/files/file_util.h" | |
| 20 #include "base/logging.h" | |
| 21 #include "base/threading/thread_restrictions.h" | |
| 22 | |
| 23 namespace base { | |
| 24 | |
| 25 namespace { | |
| 26 // To avoid users sending negative message lengths to Send/Receive | |
| 27 // we clamp message lengths, which are size_t, to no more than INT_MAX. | |
| 28 const size_t kMaxMessageLength = static_cast<size_t>(INT_MAX); | |
| 29 | |
| 30 // Writes |length| of |buffer| into |handle|. Returns the number of bytes | |
| 31 // written or zero on error. |length| must be greater than 0. | |
| 32 size_t SendHelper(SyncSocket::Handle handle, | |
| 33 const void* buffer, | |
| 34 size_t length) { | |
| 35 DCHECK_GT(length, 0u); | |
| 36 DCHECK_LE(length, kMaxMessageLength); | |
| 37 DCHECK_NE(handle, SyncSocket::kInvalidHandle); | |
| 38 const char* charbuffer = static_cast<const char*>(buffer); | |
| 39 return WriteFileDescriptor(handle, charbuffer, length) | |
| 40 ? static_cast<size_t>(length) | |
| 41 : 0; | |
| 42 } | |
| 43 | |
| 44 bool CloseHandle(SyncSocket::Handle handle) { | |
| 45 if (handle != SyncSocket::kInvalidHandle && close(handle) < 0) { | |
| 46 DPLOG(ERROR) << "close"; | |
| 47 return false; | |
| 48 } | |
| 49 | |
| 50 return true; | |
| 51 } | |
| 52 | |
| 53 } // namespace | |
| 54 | |
| 55 const SyncSocket::Handle SyncSocket::kInvalidHandle = -1; | |
| 56 | |
| 57 SyncSocket::SyncSocket() : handle_(kInvalidHandle) {} | |
| 58 | |
| 59 SyncSocket::~SyncSocket() { | |
| 60 Close(); | |
| 61 } | |
| 62 | |
| 63 // static | |
| 64 bool SyncSocket::CreatePair(SyncSocket* socket_a, SyncSocket* socket_b) { | |
| 65 DCHECK_NE(socket_a, socket_b); | |
| 66 DCHECK_EQ(socket_a->handle_, kInvalidHandle); | |
| 67 DCHECK_EQ(socket_b->handle_, kInvalidHandle); | |
| 68 | |
| 69 #if defined(OS_MACOSX) | |
| 70 int nosigpipe = 1; | |
| 71 #endif // defined(OS_MACOSX) | |
| 72 | |
| 73 Handle handles[2] = { kInvalidHandle, kInvalidHandle }; | |
| 74 if (socketpair(AF_UNIX, SOCK_STREAM, 0, handles) != 0) { | |
| 75 CloseHandle(handles[0]); | |
| 76 CloseHandle(handles[1]); | |
| 77 return false; | |
| 78 } | |
| 79 | |
| 80 #if defined(OS_MACOSX) | |
| 81 // On OSX an attempt to read or write to a closed socket may generate a | |
| 82 // SIGPIPE rather than returning -1. setsockopt will shut this off. | |
| 83 if (0 != setsockopt(handles[0], SOL_SOCKET, SO_NOSIGPIPE, | |
| 84 &nosigpipe, sizeof nosigpipe) || | |
| 85 0 != setsockopt(handles[1], SOL_SOCKET, SO_NOSIGPIPE, | |
| 86 &nosigpipe, sizeof nosigpipe)) { | |
| 87 CloseHandle(handles[0]); | |
| 88 CloseHandle(handles[1]); | |
| 89 return false; | |
| 90 } | |
| 91 #endif | |
| 92 | |
| 93 // Copy the handles out for successful return. | |
| 94 socket_a->handle_ = handles[0]; | |
| 95 socket_b->handle_ = handles[1]; | |
| 96 | |
| 97 return true; | |
| 98 } | |
| 99 | |
| 100 // static | |
| 101 SyncSocket::Handle SyncSocket::UnwrapHandle( | |
| 102 const TransitDescriptor& descriptor) { | |
| 103 return descriptor.fd; | |
| 104 } | |
| 105 | |
| 106 bool SyncSocket::PrepareTransitDescriptor(ProcessHandle peer_process_handle, | |
| 107 TransitDescriptor* descriptor) { | |
| 108 descriptor->fd = handle(); | |
| 109 descriptor->auto_close = false; | |
| 110 return descriptor->fd != kInvalidHandle; | |
| 111 } | |
| 112 | |
| 113 bool SyncSocket::Close() { | |
| 114 const bool retval = CloseHandle(handle_); | |
| 115 handle_ = kInvalidHandle; | |
| 116 return retval; | |
| 117 } | |
| 118 | |
| 119 size_t SyncSocket::Send(const void* buffer, size_t length) { | |
| 120 ThreadRestrictions::AssertIOAllowed(); | |
| 121 return SendHelper(handle_, buffer, length); | |
| 122 } | |
| 123 | |
| 124 size_t SyncSocket::Receive(void* buffer, size_t length) { | |
| 125 ThreadRestrictions::AssertIOAllowed(); | |
| 126 DCHECK_GT(length, 0u); | |
| 127 DCHECK_LE(length, kMaxMessageLength); | |
| 128 DCHECK_NE(handle_, kInvalidHandle); | |
| 129 char* charbuffer = static_cast<char*>(buffer); | |
| 130 if (ReadFromFD(handle_, charbuffer, length)) | |
| 131 return length; | |
| 132 return 0; | |
| 133 } | |
| 134 | |
| 135 size_t SyncSocket::ReceiveWithTimeout(void* buffer, | |
| 136 size_t length, | |
| 137 TimeDelta timeout) { | |
| 138 ThreadRestrictions::AssertIOAllowed(); | |
| 139 DCHECK_GT(length, 0u); | |
| 140 DCHECK_LE(length, kMaxMessageLength); | |
| 141 DCHECK_NE(handle_, kInvalidHandle); | |
| 142 | |
| 143 // TODO(dalecurtis): There's an undiagnosed issue on OSX where we're seeing | |
| 144 // large numbers of open files which prevents select() from being used. In | |
| 145 // this case, the best we can do is Peek() to see if we can Receive() now or | |
| 146 // return a timeout error (0) if not. See http://crbug.com/314364. | |
| 147 if (handle_ >= FD_SETSIZE) | |
| 148 return Peek() < length ? 0 : Receive(buffer, length); | |
| 149 | |
| 150 // Only timeouts greater than zero and less than one second are allowed. | |
| 151 DCHECK_GT(timeout.InMicroseconds(), 0); | |
| 152 DCHECK_LT(timeout.InMicroseconds(), | |
| 153 base::TimeDelta::FromSeconds(1).InMicroseconds()); | |
| 154 | |
| 155 // Track the start time so we can reduce the timeout as data is read. | |
| 156 TimeTicks start_time = TimeTicks::Now(); | |
| 157 const TimeTicks finish_time = start_time + timeout; | |
| 158 | |
| 159 fd_set read_fds; | |
| 160 size_t bytes_read_total; | |
| 161 for (bytes_read_total = 0; | |
| 162 bytes_read_total < length && timeout.InMicroseconds() > 0; | |
| 163 timeout = finish_time - base::TimeTicks::Now()) { | |
| 164 FD_ZERO(&read_fds); | |
| 165 FD_SET(handle_, &read_fds); | |
| 166 | |
| 167 // Wait for data to become available. | |
| 168 struct timeval timeout_struct = | |
| 169 { 0, static_cast<suseconds_t>(timeout.InMicroseconds()) }; | |
| 170 const int select_result = | |
| 171 select(handle_ + 1, &read_fds, NULL, NULL, &timeout_struct); | |
| 172 // Handle EINTR manually since we need to update the timeout value. | |
| 173 if (select_result == -1 && errno == EINTR) | |
| 174 continue; | |
| 175 if (select_result <= 0) | |
| 176 return bytes_read_total; | |
| 177 | |
| 178 // select() only tells us that data is ready for reading, not how much. We | |
| 179 // must Peek() for the amount ready for reading to avoid blocking. | |
| 180 DCHECK(FD_ISSET(handle_, &read_fds)); | |
| 181 const size_t bytes_to_read = std::min(Peek(), length - bytes_read_total); | |
| 182 | |
| 183 // There may be zero bytes to read if the socket at the other end closed. | |
| 184 if (!bytes_to_read) | |
| 185 return bytes_read_total; | |
| 186 | |
| 187 const size_t bytes_received = | |
| 188 Receive(static_cast<char*>(buffer) + bytes_read_total, bytes_to_read); | |
| 189 bytes_read_total += bytes_received; | |
| 190 if (bytes_received != bytes_to_read) | |
| 191 return bytes_read_total; | |
| 192 } | |
| 193 | |
| 194 return bytes_read_total; | |
| 195 } | |
| 196 | |
| 197 size_t SyncSocket::Peek() { | |
| 198 DCHECK_NE(handle_, kInvalidHandle); | |
| 199 int number_chars = 0; | |
| 200 if (ioctl(handle_, FIONREAD, &number_chars) == -1) { | |
| 201 // If there is an error in ioctl, signal that the channel would block. | |
| 202 return 0; | |
| 203 } | |
| 204 DCHECK_GE(number_chars, 0); | |
| 205 return number_chars; | |
| 206 } | |
| 207 | |
| 208 CancelableSyncSocket::CancelableSyncSocket() {} | |
| 209 CancelableSyncSocket::CancelableSyncSocket(Handle handle) | |
| 210 : SyncSocket(handle) { | |
| 211 } | |
| 212 | |
| 213 bool CancelableSyncSocket::Shutdown() { | |
| 214 DCHECK_NE(handle_, kInvalidHandle); | |
| 215 return HANDLE_EINTR(shutdown(handle_, SHUT_RDWR)) >= 0; | |
| 216 } | |
| 217 | |
| 218 size_t CancelableSyncSocket::Send(const void* buffer, size_t length) { | |
| 219 DCHECK_GT(length, 0u); | |
| 220 DCHECK_LE(length, kMaxMessageLength); | |
| 221 DCHECK_NE(handle_, kInvalidHandle); | |
| 222 | |
| 223 const long flags = fcntl(handle_, F_GETFL, NULL); | |
| 224 if (flags != -1 && (flags & O_NONBLOCK) == 0) { | |
| 225 // Set the socket to non-blocking mode for sending if its original mode | |
| 226 // is blocking. | |
| 227 fcntl(handle_, F_SETFL, flags | O_NONBLOCK); | |
| 228 } | |
| 229 | |
| 230 const size_t len = SendHelper(handle_, buffer, length); | |
| 231 | |
| 232 if (flags != -1 && (flags & O_NONBLOCK) == 0) { | |
| 233 // Restore the original flags. | |
| 234 fcntl(handle_, F_SETFL, flags); | |
| 235 } | |
| 236 | |
| 237 return len; | |
| 238 } | |
| 239 | |
| 240 // static | |
| 241 bool CancelableSyncSocket::CreatePair(CancelableSyncSocket* socket_a, | |
| 242 CancelableSyncSocket* socket_b) { | |
| 243 return SyncSocket::CreatePair(socket_a, socket_b); | |
| 244 } | |
| 245 | |
| 246 } // namespace base | |
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