2 This file is part of GNUnet.
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3 (C) 2009 Christian Grothoff (and other contributing authors)
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5 GNUnet is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published
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7 by the Free Software Foundation; either version 2, or (at your
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8 option) any later version.
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10 GNUnet is distributed in the hope that it will be useful, but
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with GNUnet; see the file COPYING. If not, write to the
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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18 Boston, MA 02111-1307, USA.
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22 * @file util/network.c
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23 * @brief basic, low-level networking interface
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24 * @author Nils Durner
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27 #include "platform.h"
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28 #include "gnunet_disk_lib.h"
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30 #include "gnunet_container_lib.h"
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32 #define DEBUG_SOCK GNUNET_NO
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34 #ifndef INVALID_SOCKET
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35 #define INVALID_SOCKET -1
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38 struct GNUNET_NETWORK_Handle
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43 struct GNUNET_NETWORK_FDSet
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45 /* socket descriptors */
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50 struct GNUNET_CONTAINER_SList *handles;
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55 #define FD_COPY(s, d) (memcpy ((d), (s), sizeof (fd_set)))
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61 * Set if a socket should use blocking or non-blocking IO.
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63 * @param doBlock blocking mode
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64 * @return GNUNET_OK on success, GNUNET_SYSERR on error
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67 socket_set_blocking (struct GNUNET_NETWORK_Handle *fd,
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73 if (ioctlsocket (fd->fd, FIONBIO, &mode) == SOCKET_ERROR)
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75 SetErrnoFromWinsockError (WSAGetLastError ());
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76 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "ioctlsocket");
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77 return GNUNET_SYSERR;
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83 int flags = fcntl (fd->fd, F_GETFL);
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86 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "fcntl");
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87 return GNUNET_SYSERR;
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90 flags &= ~O_NONBLOCK;
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92 flags |= O_NONBLOCK;
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93 if (0 != fcntl (fd->fd, F_SETFL, flags))
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95 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "fcntl");
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96 return GNUNET_SYSERR;
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105 * Make a non-inheritable to child processes
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107 * @param h the socket to make non-inheritable
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108 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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109 * @warning Not implemented on Windows
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112 socket_set_inheritable (const struct GNUNET_NETWORK_Handle
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117 i = fcntl (h->fd, F_GETFD);
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118 if (i == (i | FD_CLOEXEC))
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120 return (fcntl (h->fd, F_SETFD, i | FD_CLOEXEC) == 0)
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121 ? GNUNET_OK : GNUNET_SYSERR;
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128 * Disable delays when sending data via the socket.
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129 * (GNUnet makes sure that messages are as big as
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130 * possible already).
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132 * @param h the socket to make non-delaying
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135 socket_set_nodelay (const struct GNUNET_NETWORK_Handle
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139 setsockopt (h->fd, IPPROTO_TCP, TCP_NODELAY, &value, sizeof(value));
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145 * accept a new connection on a socket
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147 * @param desc bound socket
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148 * @param address address of the connecting peer, may be NULL
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149 * @param address_len length of address
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150 * @return client socket
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152 struct GNUNET_NETWORK_Handle *
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153 GNUNET_NETWORK_socket_accept (const struct GNUNET_NETWORK_Handle *desc,
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154 struct sockaddr *address,
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155 socklen_t * address_len)
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157 struct GNUNET_NETWORK_Handle *ret;
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159 ret = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle));
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160 ret->fd = accept (desc->fd, address, address_len);
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161 if (ret->fd == INVALID_SOCKET)
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164 SetErrnoFromWinsockError (WSAGetLastError ());
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170 if (ret->fd >= FD_SETSIZE)
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178 if (GNUNET_SYSERR == socket_set_blocking (ret, GNUNET_NO))
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180 /* we might want to treat this one as fatal... */
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182 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ret));
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186 if (GNUNET_OK != socket_set_inheritable (ret))
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187 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
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188 "socket_set_inheritable");
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190 socket_set_nodelay (ret);
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195 * Bind to a connected socket
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196 * @param desc socket
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197 * @param address address to be bound
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198 * @param address_len length of address
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199 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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202 GNUNET_NETWORK_socket_bind (struct GNUNET_NETWORK_Handle *desc,
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203 const struct sockaddr *address,
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204 socklen_t address_len)
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208 ret = bind (desc->fd, address, address_len);
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210 if (SOCKET_ERROR == ret)
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211 SetErrnoFromWinsockError (WSAGetLastError ());
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213 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
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219 * @param desc socket
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220 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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223 GNUNET_NETWORK_socket_close (struct GNUNET_NETWORK_Handle *desc)
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229 ret = closesocket (desc->fd);
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230 SetErrnoFromWinsockError (WSAGetLastError ());
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232 ret = close (desc->fd);
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235 GNUNET_free (desc);
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237 return (ret == 0) ? GNUNET_OK : GNUNET_SYSERR;
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242 * @param desc socket
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243 * @param address peer address
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244 * @param address_len length of address
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245 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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248 GNUNET_NETWORK_socket_connect (const struct GNUNET_NETWORK_Handle *desc,
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249 const struct sockaddr *address,
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250 socklen_t address_len)
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254 ret = connect (desc->fd, address, address_len);
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256 if (SOCKET_ERROR == ret)
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258 SetErrnoFromWinsockError (WSAGetLastError ());
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259 if (errno == EWOULDBLOCK)
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260 errno = EINPROGRESS;
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263 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
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267 * Get socket options
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269 * @param desc socket
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270 * @param level protocol level of the option
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271 * @param optname identifier of the option
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272 * @param optval options
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273 * @param optlen length of optval
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274 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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277 GNUNET_NETWORK_socket_getsockopt (const struct GNUNET_NETWORK_Handle *desc,
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278 int level, int optname, void *optval,
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279 socklen_t * optlen)
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283 ret = getsockopt (desc->fd, level, optname, optval, optlen);
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285 if (ret == 0 && level == SOL_SOCKET && optname == SO_ERROR)
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286 *((int *) optval) = GetErrnoFromWinsockError (*((int *) optval));
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287 else if (SOCKET_ERROR == ret)
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288 SetErrnoFromWinsockError (WSAGetLastError ());
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290 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
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294 * Listen on a socket
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295 * @param desc socket
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296 * @param backlog length of the listen queue
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297 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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300 GNUNET_NETWORK_socket_listen (const struct GNUNET_NETWORK_Handle *desc,
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305 ret = listen (desc->fd, backlog);
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307 if (SOCKET_ERROR == ret)
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308 SetErrnoFromWinsockError (WSAGetLastError ());
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311 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
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315 * Read data from a connected socket (always non-blocking).
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316 * @param desc socket
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317 * @param buffer buffer
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318 * @param length length of buffer
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321 GNUNET_NETWORK_socket_recv (const struct GNUNET_NETWORK_Handle * desc,
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322 void *buffer, size_t length)
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328 #ifdef MSG_DONTWAIT
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329 flags |= MSG_DONTWAIT;
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331 ret = recv (desc->fd, buffer, length, flags);
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333 if (SOCKET_ERROR == ret)
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334 SetErrnoFromWinsockError (WSAGetLastError ());
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341 * Send data (always non-blocking).
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343 * @param desc socket
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344 * @param buffer data to send
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345 * @param length size of the buffer
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346 * @return number of bytes sent, GNUNET_SYSERR on error
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349 GNUNET_NETWORK_socket_send (const struct GNUNET_NETWORK_Handle * desc,
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350 const void *buffer, size_t length)
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357 /* shouldn't matter if this fails as there's a SIGPIPE handler */
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358 ret = setsockopt (desc->fd, SOL_SOCKET, SO_NOSIGPIPE,
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359 (void *) &no_sigpipe, sizeof (no_sigpipe));
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363 #ifdef MSG_DONTWAIT
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364 flags |= MSG_DONTWAIT;
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366 #ifdef MSG_NOSIGNAL
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367 flags |= MSG_NOSIGNAL;
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369 ret = send (desc->fd, buffer, length, flags);
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371 if (SOCKET_ERROR == ret)
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372 SetErrnoFromWinsockError (WSAGetLastError ());
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380 * Send data to a particular destination (always non-blocking).
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381 * This function only works for UDP sockets.
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383 * @param desc socket
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384 * @param message data to send
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385 * @param length size of the data
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386 * @param dest_addr destination address
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387 * @param dest_len length of address
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388 * @return number of bytes sent, GNUNET_SYSERR on error
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391 GNUNET_NETWORK_socket_sendto (const struct GNUNET_NETWORK_Handle * desc,
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392 const void *message, size_t length,
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393 const struct sockaddr * dest_addr,
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394 socklen_t dest_len)
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401 /* shouldn't matter if this fails as there's a SIGPIPE handler */
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402 ret = setsockopt (desc->fd, SOL_SOCKET, SO_NOSIGPIPE,
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403 (void *) &no_sigpipe, sizeof (no_sigpipe));
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407 #ifdef MSG_DONTWAIT
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408 flags |= MSG_DONTWAIT;
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410 #ifdef MSG_NOSIGNAL
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411 flags |= MSG_NOSIGNAL;
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413 ret = sendto (desc->fd, message, length, flags, dest_addr, dest_len);
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415 if (SOCKET_ERROR == ret)
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416 SetErrnoFromWinsockError (WSAGetLastError ());
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423 * Set socket option
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425 * @param level protocol level of the option
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426 * @param option_name option identifier
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427 * @param option_value value to set
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428 * @param option_len size of option_value
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429 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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432 GNUNET_NETWORK_socket_setsockopt (struct GNUNET_NETWORK_Handle *fd,
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433 int level, int option_name,
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434 const void *option_value,
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435 socklen_t option_len)
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439 ret = setsockopt (fd->fd, level, option_name, option_value, option_len);
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441 if (SOCKET_ERROR == ret)
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442 SetErrnoFromWinsockError (WSAGetLastError ());
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445 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
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451 * Create a new socket. Configure it for non-blocking IO and
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452 * mark it as non-inheritable to child processes (set the
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453 * close-on-exec flag).
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455 * @param domain domain of the socket
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456 * @param type socket type
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457 * @param protocol network protocol
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458 * @return new socket, NULL on error
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460 struct GNUNET_NETWORK_Handle *
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461 GNUNET_NETWORK_socket_create (int domain, int type, int protocol)
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463 struct GNUNET_NETWORK_Handle *ret;
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465 ret = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle));
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466 ret->fd = socket (domain, type, protocol);
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467 if (INVALID_SOCKET == ret->fd)
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470 SetErrnoFromWinsockError (WSAGetLastError ());
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476 if (ret->fd >= FD_SETSIZE)
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485 if (GNUNET_SYSERR == socket_set_blocking (ret, GNUNET_NO))
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487 /* we might want to treat this one as fatal... */
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489 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ret));
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493 if (GNUNET_OK != socket_set_inheritable (ret))
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494 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
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495 "socket_set_inheritable");
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497 if (type == SOCK_STREAM)
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498 socket_set_nodelay (ret);
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504 * Shut down socket operations
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505 * @param desc socket
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506 * @param how type of shutdown
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507 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
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510 GNUNET_NETWORK_socket_shutdown (struct GNUNET_NETWORK_Handle *desc,
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515 ret = shutdown (desc->fd, how);
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518 SetErrnoFromWinsockError (WSAGetLastError ());
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521 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
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527 * @param fds fd set
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530 GNUNET_NETWORK_fdset_zero (struct GNUNET_NETWORK_FDSet *fds)
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532 FD_ZERO (&fds->sds);
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535 GNUNET_CONTAINER_slist_clear (fds->handles);
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541 * Add a socket to the FD set
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542 * @param fds fd set
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543 * @param desc socket to add
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546 GNUNET_NETWORK_fdset_set (struct GNUNET_NETWORK_FDSet *fds,
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547 const struct GNUNET_NETWORK_Handle *desc)
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549 FD_SET (desc->fd, &fds->sds);
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551 if (desc->fd + 1 > fds->nsds)
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552 fds->nsds = desc->fd + 1;
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557 * Check whether a socket is part of the fd set
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558 * @param fds fd set
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559 * @param desc socket
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560 * @return 0 if the FD is not set
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563 GNUNET_NETWORK_fdset_isset (const struct GNUNET_NETWORK_FDSet *fds,
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564 const struct GNUNET_NETWORK_Handle *desc)
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566 return FD_ISSET (desc->fd, &fds->sds);
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571 * Add one fd set to another
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572 * @param dst the fd set to add to
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573 * @param src the fd set to add from
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576 GNUNET_NETWORK_fdset_add (struct GNUNET_NETWORK_FDSet *dst,
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577 const struct GNUNET_NETWORK_FDSet *src)
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581 for (nfds = src->nsds; nfds > 0; nfds--)
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582 if (FD_ISSET (nfds, &src->sds))
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584 FD_SET (nfds, &dst->sds);
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585 if (nfds + 1 > dst->nsds)
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586 dst->nsds = nfds + 1;
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592 * Copy one fd set to another
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593 * @param to destination
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594 * @param from source
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597 GNUNET_NETWORK_fdset_copy (struct GNUNET_NETWORK_FDSet *to,
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598 const struct GNUNET_NETWORK_FDSet *from)
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600 FD_COPY (&from->sds, &to->sds);
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601 to->nsds = from->nsds;
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603 struct GNUNET_CONTAINER_SList_Iterator *iter;
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606 GNUNET_CONTAINER_slist_clear (to->handles);
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608 for (iter = GNUNET_CONTAINER_slist_begin (from->handles);
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609 GNUNET_CONTAINER_slist_end (iter) != GNUNET_YES; GNUNET_CONTAINER_slist_next (iter))
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614 handle = GNUNET_CONTAINER_slist_get (iter, &len);
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615 GNUNET_CONTAINER_slist_add (to->handles, GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT, handle, len);
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622 * Copy a native fd set
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623 * @param to destination
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624 * @param from native source set
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625 * @param nfds the biggest socket number in from + 1
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628 GNUNET_NETWORK_fdset_copy_native (struct GNUNET_NETWORK_FDSet *to,
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629 const fd_set * from, int nfds)
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631 FD_COPY (from, &to->sds);
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637 * Add a file handle to the fd set
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638 * @param fds fd set
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639 * @param h the file handle to add
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642 GNUNET_NETWORK_fdset_handle_set (struct GNUNET_NETWORK_FDSet *fds,
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643 const struct GNUNET_DISK_FileHandle *h)
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648 GNUNET_DISK_internal_file_handle_ (h, &hw, sizeof (HANDLE));
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649 GNUNET_CONTAINER_slist_add (fds->handles, GNUNET_NO, &hw, sizeof (HANDLE));
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653 GNUNET_DISK_internal_file_handle_ (h, &fd, sizeof (int));
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654 FD_SET (fd, &fds->sds);
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655 if (fd + 1 > fds->nsds)
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656 fds->nsds = fd + 1;
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661 * Check if a file handle is part of an fd set
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662 * @param fds fd set
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663 * @param h file handle
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664 * @return GNUNET_YES if the file handle is part of the set
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667 GNUNET_NETWORK_fdset_handle_isset (const struct GNUNET_NETWORK_FDSet *fds,
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668 const struct GNUNET_DISK_FileHandle *h)
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671 return GNUNET_CONTAINER_slist_contains (fds->handles, h->h, sizeof (HANDLE));
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673 return FD_ISSET (h->fd, &fds->sds);
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678 * Checks if two fd sets overlap
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679 * @param fds1 first fd set
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680 * @param fds2 second fd set
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681 * @return GNUNET_YES if they do overlap, GNUNET_NO otherwise
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684 GNUNET_NETWORK_fdset_overlap (const struct GNUNET_NETWORK_FDSet *fds1,
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685 const struct GNUNET_NETWORK_FDSet *fds2)
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690 if (nfds < fds2->nsds)
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693 for (; nfds >= 0; nfds--)
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694 if (FD_ISSET (nfds, &fds1->sds) && FD_ISSET (nfds, &fds2->sds))
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701 * Creates an fd set
\r
702 * @return a new fd set
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704 struct GNUNET_NETWORK_FDSet *
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705 GNUNET_NETWORK_fdset_create ()
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707 struct GNUNET_NETWORK_FDSet *fds;
\r
709 fds = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_FDSet));
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711 fds->handles = GNUNET_CONTAINER_slist_create ();
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713 GNUNET_NETWORK_fdset_zero (fds);
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719 * Releases the associated memory of an fd set
\r
720 * @param fds fd set
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723 GNUNET_NETWORK_fdset_destroy (struct GNUNET_NETWORK_FDSet *fds)
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726 GNUNET_CONTAINER_slist_destroy (fds->handles);
\r
733 * Check if sockets meet certain conditions
\r
734 * @param rfds set of sockets to be checked for readability
\r
735 * @param wfds set of sockets to be checked for writability
\r
736 * @param efds set of sockets to be checked for exceptions
\r
737 * @param timeout relative value when to return
\r
738 * @return number of selected sockets, GNUNET_SYSERR on error
\r
741 GNUNET_NETWORK_socket_select (struct GNUNET_NETWORK_FDSet *rfds,
\r
742 struct GNUNET_NETWORK_FDSet *wfds,
\r
743 struct GNUNET_NETWORK_FDSet *efds,
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744 const struct GNUNET_TIME_Relative timeout)
\r
752 nfds = GNUNET_MAX (nfds, wfds->nsds);
\r
754 nfds = GNUNET_MAX (nfds, efds->nsds);
\r
759 tv.tv_sec = timeout.value / GNUNET_TIME_UNIT_SECONDS.value;
\r
760 tv.tv_usec = 1000 * (timeout.value - (tv.tv_sec * GNUNET_TIME_UNIT_SECONDS.value));
\r
761 if ( (nfds == 0) &&
\r
762 (timeout.value == GNUNET_TIME_UNIT_FOREVER_REL.value) )
\r
764 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
\r
765 _("Fatal internal logic error, process hangs in `%s' (abort with CTRL-C)!\n"),
\r
769 return select (nfds + 1,
\r
770 (rfds != NULL) ? &rfds->sds : NULL,
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771 (wfds != NULL) ? &wfds->sds : NULL,
\r
772 (efds != NULL) ? &efds->sds : NULL,
\r
773 (timeout.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
\r
778 fd_set sock_read, sock_write, sock_except;
\r
779 fd_set aread, awrite, aexcept;
\r
781 struct timeval tvslice;
\r
785 #define SAFE_FD_ISSET(fd, set) (set != NULL && FD_ISSET(fd, set))
\r
787 /* calculate how long we need to wait in milliseconds */
\r
788 if (timeout.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
\r
789 ms_total = INFINITE;
\r
791 ms_total = timeout.value / GNUNET_TIME_UNIT_MILLISECONDS.value;
\r
793 /* select() may be used as a portable way to sleep */
\r
794 if (!(rfds || wfds || efds))
\r
801 sock_read = rfds->sds;
\r
803 FD_ZERO(&sock_read);
\r
806 sock_write = wfds->sds;
\r
808 FD_ZERO(&sock_write);
\r
811 sock_except = efds->sds;
\r
813 FD_ZERO(&sock_except);
\r
815 /* multiplex between winsock select() and waiting on the handles */
\r
819 FD_ZERO (&aexcept);
\r
821 limit = GetTickCount () + ms_total;
\r
828 /* overwrite the zero'd sets here; the select call
\r
829 * will clear those that are not active */
\r
831 FD_COPY (&sock_read, &aread);
\r
832 FD_COPY (&sock_write, &awrite);
\r
833 FD_COPY (&sock_except, &aexcept);
\r
835 tvslice.tv_sec = 0;
\r
836 tvslice.tv_usec = 100000;
\r
839 select (nfds + 1, &aread, &awrite, &aexcept,
\r
840 &tvslice)) == SOCKET_ERROR)
\r
842 SetErrnoFromWinsockError (WSAGetLastError ());
\r
843 if (errno == ENOTSOCK)
\r
847 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "select");
\r
850 goto select_loop_end;
\r
854 /* Poll read pipes */
\r
857 struct GNUNET_CONTAINER_SList_Iterator *i;
\r
860 on_next = GNUNET_NO;
\r
861 for (i = GNUNET_CONTAINER_slist_begin (rfds->handles);
\r
862 GNUNET_CONTAINER_slist_end (i) != GNUNET_YES;
\r
863 on_next || GNUNET_CONTAINER_slist_next (i))
\r
868 h = *(HANDLE *) GNUNET_CONTAINER_slist_get (i, NULL);
\r
869 on_next = GNUNET_NO;
\r
871 if (!PeekNamedPipe (h, NULL, 0, NULL, &dwBytes, NULL))
\r
873 GNUNET_CONTAINER_slist_erase (i);
\r
874 on_next = GNUNET_YES;
\r
877 SetErrnoFromWinError (GetLastError ());
\r
879 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "PeekNamedPipe");
\r
881 goto select_loop_end;
\r
889 GNUNET_CONTAINER_slist_erase (i);
\r
890 on_next = GNUNET_YES;
\r
895 /* Poll for faulty pipes */
\r
898 struct GNUNET_CONTAINER_SList_Iterator *i;
\r
901 on_next = GNUNET_NO;
\r
902 for (i = GNUNET_CONTAINER_slist_begin (efds->handles);
\r
903 GNUNET_CONTAINER_slist_end (i) != GNUNET_YES;
\r
904 on_next || GNUNET_CONTAINER_slist_next (i))
\r
909 h = *(HANDLE *) GNUNET_CONTAINER_slist_get (i, NULL);
\r
911 if (PeekNamedPipe (h, NULL, 0, NULL, &dwBytes, NULL))
\r
913 GNUNET_CONTAINER_slist_erase (i);
\r
914 on_next = GNUNET_YES;
\r
919 on_next = GNUNET_NO;
\r
925 GNUNET_assert (GNUNET_CONTAINER_slist_count (wfds->handles) == 0);
\r
927 /* Check for closed sockets */
\r
928 for (i = 0; i < nfds; i++)
\r
930 if (SAFE_FD_ISSET (i, &sock_read))
\r
932 struct sockaddr addr;
\r
935 if (getpeername (i, &addr, &len) == SOCKET_ERROR)
\r
939 len = sizeof (err);
\r
941 (i, SOL_SOCKET, SO_ERROR, (char *) &err, &len) == 0
\r
942 && err == WSAENOTCONN)
\r
944 if (!SAFE_FD_ISSET (i, &aread))
\r
946 FD_SET (i, &aread);
\r
956 while (retcode == 0 && (ms_total == INFINITE || GetTickCount () < limit));
\r
962 GNUNET_NETWORK_fdset_zero (rfds);
\r
963 GNUNET_NETWORK_fdset_copy_native (rfds, &aread, retcode);
\r
968 GNUNET_NETWORK_fdset_zero (wfds);
\r
969 GNUNET_NETWORK_fdset_copy_native (wfds, &awrite, retcode);
\r
974 GNUNET_NETWORK_fdset_zero (efds);
\r
975 GNUNET_NETWORK_fdset_copy_native (efds, &aexcept, retcode);
\r
984 /* end of network.c */
\r