2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/network.c
23 * @brief basic, low-level networking interface
28 #include "gnunet_disk_lib.h"
30 #include "gnunet_container_lib.h"
32 #define DEBUG_NETWORK GNUNET_YES
34 #ifndef INVALID_SOCKET
35 #define INVALID_SOCKET -1
39 struct GNUNET_NETWORK_Handle
49 * Address family / domain.
54 * Number of bytes in addr.
59 * Address we were bound to, or NULL.
61 struct sockaddr *addr;
66 struct GNUNET_NETWORK_FDSet
70 * Maximum number of any socket socket descriptor in the set (plus one)
75 * Bitset with the descriptors.
81 * Linked list of handles
83 struct GNUNET_CONTAINER_SList *handles;
89 #define FD_COPY(s, d) (memcpy ((d), (s), sizeof (fd_set)))
94 * Set if a socket should use blocking or non-blocking IO.
96 * @param doBlock blocking mode
97 * @return GNUNET_OK on success, GNUNET_SYSERR on error
100 socket_set_blocking (struct GNUNET_NETWORK_Handle *fd, int doBlock)
106 if (ioctlsocket (fd->fd, FIONBIO, &mode) == SOCKET_ERROR)
109 SetErrnoFromWinsockError (WSAGetLastError ());
110 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "ioctlsocket");
111 return GNUNET_SYSERR;
117 int flags = fcntl (fd->fd, F_GETFL);
121 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "fcntl");
122 return GNUNET_SYSERR;
125 flags &= ~O_NONBLOCK;
129 if (0 != fcntl (fd->fd, F_SETFL, flags))
132 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "fcntl");
133 return GNUNET_SYSERR;
142 * Make a socket non-inheritable to child processes
144 * @param h the socket to make non-inheritable
145 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
146 * @warning Not implemented on Windows
149 socket_set_inheritable (const struct GNUNET_NETWORK_Handle *h)
153 i = fcntl (h->fd, F_GETFD);
155 return GNUNET_SYSERR;
156 if (i == (i | FD_CLOEXEC))
159 if (fcntl (h->fd, F_SETFD, i) < 0)
160 return GNUNET_SYSERR;
168 * The MSG_NOSIGNAL equivalent on Mac OS X
170 * @param h the socket to make non-delaying
173 socket_set_nosigpipe (const struct GNUNET_NETWORK_Handle *h)
177 setsockopt (h->fd, SOL_SOCKET, SO_NOSIGPIPE, &abs_value, sizeof (abs_value)))
178 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "setsockopt");
184 * Disable delays when sending data via the socket.
185 * (GNUnet makes sure that messages are as big as
188 * @param h the socket to make non-delaying
191 socket_set_nodelay (const struct GNUNET_NETWORK_Handle *h)
195 if (0 != setsockopt (h->fd, IPPROTO_TCP, TCP_NODELAY, &value, sizeof (value)))
196 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "setsockopt");
198 const char * abs_value = "1";
199 if (0 != setsockopt (h->fd, IPPROTO_TCP, TCP_NODELAY, abs_value, sizeof (abs_value)))
200 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "setsockopt");
206 * accept a new connection on a socket
208 * @param desc bound socket
209 * @param address address of the connecting peer, may be NULL
210 * @param address_len length of address
211 * @return client socket
213 struct GNUNET_NETWORK_Handle *
214 GNUNET_NETWORK_socket_accept (const struct GNUNET_NETWORK_Handle *desc,
215 struct sockaddr *address,
216 socklen_t * address_len)
218 struct GNUNET_NETWORK_Handle *ret;
220 ret = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle));
221 ret->fd = accept (desc->fd, address, address_len);
222 ret->af = address->sa_family;
223 if (ret->fd == INVALID_SOCKET)
226 SetErrnoFromWinsockError (WSAGetLastError ());
232 if (ret->fd >= FD_SETSIZE)
234 GNUNET_break (0 == close (ret->fd));
240 if (GNUNET_SYSERR == socket_set_blocking (ret, GNUNET_NO))
244 /* we might want to treat this one as fatal... */
246 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ret));
251 if (GNUNET_OK != socket_set_inheritable (ret))
252 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
253 "socket_set_inheritable");
256 socket_set_nosigpipe (ret);
259 if (address->sa_family != AF_UNIX)
261 socket_set_nodelay (ret);
267 * Bind to a connected socket
269 * @param address address to be bound
270 * @param address_len length of address
271 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
274 GNUNET_NETWORK_socket_bind (struct GNUNET_NETWORK_Handle *desc,
275 const struct sockaddr *address,
276 socklen_t address_len)
283 if (desc->af == AF_INET6)
284 if (0 != setsockopt (desc->fd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof (on)))
285 GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "setsockopt");
287 /* is this needed or desired? or done elsewhere? */
288 if (0 != setsockopt (desc->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)))
289 GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "setsockopt");
295 if (address->sa_family == AF_UNIX)
297 const struct sockaddr_un *un = (const struct sockaddr_un*) address;
298 (void) unlink (un->sun_path);
302 ret = bind (desc->fd, address, address_len);
304 if (SOCKET_ERROR == ret)
305 SetErrnoFromWinsockError (WSAGetLastError ());
308 return GNUNET_SYSERR;
311 desc->addr = GNUNET_malloc (address_len);
312 memcpy (desc->addr, address, address_len);
313 desc->addrlen = address_len;
323 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
326 GNUNET_NETWORK_socket_close (struct GNUNET_NETWORK_Handle *desc)
331 ret = closesocket (desc->fd);
332 SetErrnoFromWinsockError (WSAGetLastError ());
334 ret = close (desc->fd);
338 if ( (desc->af == AF_UNIX) && (NULL != desc->addr) )
340 const struct sockaddr_un *un = (const struct sockaddr_un*) desc->addr;
341 if (0 != unlink (un->sun_path))
342 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
348 GNUNET_free_non_null (desc->addr);
350 return (ret == 0) ? GNUNET_OK : GNUNET_SYSERR;
355 * Box a native socket (and check that it is a socket).
357 * @param fd socket to box
358 * @return NULL on error (including not supported on target platform)
360 struct GNUNET_NETWORK_Handle *
361 GNUNET_NETWORK_socket_box_native (int fd)
366 struct GNUNET_NETWORK_Handle *ret;
368 if (fcntl (fd, F_GETFD) < 0)
369 return NULL; /* invalid FD */
370 ret = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle));
381 * @param address peer address
382 * @param address_len length of address
383 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
386 GNUNET_NETWORK_socket_connect (const struct GNUNET_NETWORK_Handle *desc,
387 const struct sockaddr *address,
388 socklen_t address_len)
391 ret = connect (desc->fd, address, address_len);
394 if (SOCKET_ERROR == ret)
396 SetErrnoFromWinsockError (WSAGetLastError ());
397 if (errno == EWOULDBLOCK)
401 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
409 * @param level protocol level of the option
410 * @param optname identifier of the option
411 * @param optval options
412 * @param optlen length of optval
413 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
416 GNUNET_NETWORK_socket_getsockopt (const struct GNUNET_NETWORK_Handle *desc,
417 int level, int optname, void *optval,
421 ret = getsockopt (desc->fd, level, optname, optval, optlen);
424 if (ret == 0 && level == SOL_SOCKET && optname == SO_ERROR)
425 *((int *) optval) = GetErrnoFromWinsockError (*((int *) optval));
427 else if (SOCKET_ERROR == ret)
428 SetErrnoFromWinsockError (WSAGetLastError ());
431 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
438 * @param backlog length of the listen queue
439 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
442 GNUNET_NETWORK_socket_listen (const struct GNUNET_NETWORK_Handle *desc,
446 ret = listen (desc->fd, backlog);
449 if (SOCKET_ERROR == ret)
450 SetErrnoFromWinsockError (WSAGetLastError ());
453 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
458 * How much data is available to be read on this descriptor?
460 * Returns GNUNET_NO if no data is available, or on error!
464 GNUNET_NETWORK_socket_recvfrom_amount (const struct GNUNET_NETWORK_Handle
469 /* How much is there to be read? */
472 error = ioctl (desc->fd, FIONREAD, &pending);
476 error = ioctlsocket (desc->fd, FIONREAD, &pending);
477 if (error != SOCKET_ERROR)
486 * Read data from a connected socket (always non-blocking).
488 * @param buffer buffer
489 * @param length length of buffer
490 * @param src_addr either the source to recv from, or all zeroes
491 * to be filled in by recvfrom
492 * @param addrlen length of the addr
495 GNUNET_NETWORK_socket_recvfrom (const struct GNUNET_NETWORK_Handle * desc,
496 void *buffer, size_t length,
497 struct sockaddr * src_addr,
505 flags |= MSG_DONTWAIT;
508 ret = recvfrom (desc->fd, buffer, length, flags, src_addr, addrlen);
510 if (SOCKET_ERROR == ret)
511 SetErrnoFromWinsockError (WSAGetLastError ());
518 * Read data from a connected socket (always non-blocking).
520 * @param buffer buffer
521 * @param length length of buffer
524 GNUNET_NETWORK_socket_recv (const struct GNUNET_NETWORK_Handle * desc,
525 void *buffer, size_t length)
532 flags |= MSG_DONTWAIT;
534 ret = recv (desc->fd, buffer, length, flags);
536 if (SOCKET_ERROR == ret)
537 SetErrnoFromWinsockError (WSAGetLastError ());
544 * Send data (always non-blocking).
547 * @param buffer data to send
548 * @param length size of the buffer
549 * @return number of bytes sent, GNUNET_SYSERR on error
552 GNUNET_NETWORK_socket_send (const struct GNUNET_NETWORK_Handle * desc,
553 const void *buffer, size_t length)
560 flags |= MSG_DONTWAIT;
564 flags |= MSG_NOSIGNAL;
567 ret = send (desc->fd, buffer, length, flags);
570 if (SOCKET_ERROR == ret)
571 SetErrnoFromWinsockError (WSAGetLastError ());
579 * Send data to a particular destination (always non-blocking).
580 * This function only works for UDP sockets.
583 * @param message data to send
584 * @param length size of the data
585 * @param dest_addr destination address
586 * @param dest_len length of address
587 * @return number of bytes sent, GNUNET_SYSERR on error
590 GNUNET_NETWORK_socket_sendto (const struct GNUNET_NETWORK_Handle * desc,
591 const void *message, size_t length,
592 const struct sockaddr * dest_addr,
600 flags |= MSG_DONTWAIT;
603 flags |= MSG_NOSIGNAL;
605 ret = sendto (desc->fd, message, length, flags, dest_addr, dest_len);
607 if (SOCKET_ERROR == ret)
608 SetErrnoFromWinsockError (WSAGetLastError ());
617 * @param level protocol level of the option
618 * @param option_name option identifier
619 * @param option_value value to set
620 * @param option_len size of option_value
621 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
624 GNUNET_NETWORK_socket_setsockopt (struct GNUNET_NETWORK_Handle *fd,
625 int level, int option_name,
626 const void *option_value,
627 socklen_t option_len)
631 ret = setsockopt (fd->fd, level, option_name, option_value, option_len);
633 if (SOCKET_ERROR == ret)
634 SetErrnoFromWinsockError (WSAGetLastError ());
636 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
641 * Create a new socket. Configure it for non-blocking IO and
642 * mark it as non-inheritable to child processes (set the
643 * close-on-exec flag).
645 * @param domain domain of the socket
646 * @param type socket type
647 * @param protocol network protocol
648 * @return new socket, NULL on error
650 struct GNUNET_NETWORK_Handle *
651 GNUNET_NETWORK_socket_create (int domain, int type, int protocol)
653 struct GNUNET_NETWORK_Handle *ret;
655 ret = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_Handle));
657 ret->fd = socket (domain, type, protocol);
658 if (INVALID_SOCKET == ret->fd)
661 SetErrnoFromWinsockError (WSAGetLastError ());
668 if (ret->fd >= FD_SETSIZE)
670 GNUNET_break (0 == close (ret->fd));
677 if (GNUNET_SYSERR == socket_set_blocking (ret, GNUNET_NO))
679 /* we might want to treat this one as fatal... */
681 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (ret));
686 if (GNUNET_OK != socket_set_inheritable (ret))
687 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
688 "socket_set_inheritable");
691 socket_set_nosigpipe (ret);
693 if ( (type == SOCK_STREAM)
695 && (domain != AF_UNIX)
698 socket_set_nodelay (ret);
704 * Shut down socket operations
706 * @param how type of shutdown
707 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
710 GNUNET_NETWORK_socket_shutdown (struct GNUNET_NETWORK_Handle *desc, int how)
714 ret = shutdown (desc->fd, how);
717 SetErrnoFromWinsockError (WSAGetLastError ());
719 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
724 * Disable the "CORK" feature for communication with the given socket,
725 * forcing the OS to immediately flush the buffer on transmission
726 * instead of potentially buffering multiple messages. Essentially
727 * reduces the OS send buffers to zero.
730 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
733 GNUNET_NETWORK_socket_disable_corking (struct GNUNET_NETWORK_Handle *desc)
738 if (0 != (ret = setsockopt (desc->fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof (value))))
739 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "setsockopt");
740 if (0 != (ret = setsockopt (desc->fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof (value))))
741 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "setsockopt");
743 return ret == 0 ? GNUNET_OK : GNUNET_SYSERR;
752 GNUNET_NETWORK_fdset_zero (struct GNUNET_NETWORK_FDSet *fds)
757 GNUNET_CONTAINER_slist_clear (fds->handles);
762 * Add a socket to the FD set
764 * @param desc socket to add
767 GNUNET_NETWORK_fdset_set (struct GNUNET_NETWORK_FDSet *fds,
768 const struct GNUNET_NETWORK_Handle *desc)
770 FD_SET (desc->fd, &fds->sds);
771 if (desc->fd + 1 > fds->nsds)
772 fds->nsds = desc->fd + 1;
777 * Check whether a socket is part of the fd set
780 * @return 0 if the FD is not set
783 GNUNET_NETWORK_fdset_isset (const struct GNUNET_NETWORK_FDSet *fds,
784 const struct GNUNET_NETWORK_Handle *desc)
786 return FD_ISSET (desc->fd, &fds->sds);
791 * Add one fd set to another
792 * @param dst the fd set to add to
793 * @param src the fd set to add from
796 GNUNET_NETWORK_fdset_add (struct GNUNET_NETWORK_FDSet *dst,
797 const struct GNUNET_NETWORK_FDSet *src)
800 for (nfds = src->nsds; nfds > 0; nfds--)
801 if (FD_ISSET (nfds, &src->sds))
804 FD_SET (nfds, &dst->sds);
805 if (nfds + 1 > dst->nsds)
806 dst->nsds = nfds + 1;
809 GNUNET_CONTAINER_slist_append (dst->handles, src->handles);
815 * Copy one fd set to another
817 * @param to destination
821 GNUNET_NETWORK_fdset_copy (struct GNUNET_NETWORK_FDSet *to,
822 const struct GNUNET_NETWORK_FDSet *from)
824 FD_COPY (&from->sds, &to->sds);
825 to->nsds = from->nsds;
828 GNUNET_CONTAINER_slist_clear (to->handles);
829 GNUNET_CONTAINER_slist_append (to->handles, from->handles);
835 * Return file descriptor for this network handle
837 * @param desc wrapper to process
838 * @return POSIX file descriptor
841 GNUNET_NETWORK_get_fd (struct GNUNET_NETWORK_Handle *desc)
848 * Copy a native fd set
850 * @param to destination
851 * @param from native source set
852 * @param nfds the biggest socket number in from + 1
855 GNUNET_NETWORK_fdset_copy_native (struct GNUNET_NETWORK_FDSet *to,
856 const fd_set * from, int nfds)
858 FD_COPY (from, &to->sds);
864 * Set a native fd in a set
866 * @param to destination
867 * @param nfd native FD to set
869 void GNUNET_NETWORK_fdset_set_native (struct GNUNET_NETWORK_FDSet *to,
872 GNUNET_assert(nfd >= 0);
873 FD_SET (nfd, &to->sds);
874 to->nsds = GNUNET_MAX (nfd + 1, to->nsds);
879 * Test native fd in a set
881 * @param to set to test, NULL for empty set
882 * @param nfd native FD to test, or -1 for none
883 * @return GNUNET_YES if FD is set in the set
886 GNUNET_NETWORK_fdset_test_native (const struct GNUNET_NETWORK_FDSet *to,
889 if ( (nfd == -1) || (to == NULL) )
891 return FD_ISSET (nfd, &to->sds) ? GNUNET_YES : GNUNET_NO;
896 * Add a file handle to the fd set
898 * @param h the file handle to add
901 GNUNET_NETWORK_fdset_handle_set (struct GNUNET_NETWORK_FDSet *fds,
902 const struct GNUNET_DISK_FileHandle *h)
905 GNUNET_CONTAINER_slist_add (fds->handles,
906 GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT,
907 h, sizeof (struct GNUNET_DISK_FileHandle));
911 GNUNET_DISK_internal_file_handle_ (h, &fd, sizeof (int));
912 FD_SET (fd, &fds->sds);
913 if (fd + 1 > fds->nsds)
921 * Check if a file handle is part of an fd set
923 * @param h file handle
924 * @return GNUNET_YES if the file handle is part of the set
927 GNUNET_NETWORK_fdset_handle_isset (const struct GNUNET_NETWORK_FDSet *fds,
928 const struct GNUNET_DISK_FileHandle *h)
932 return GNUNET_CONTAINER_slist_contains (fds->handles, h,
933 sizeof (struct GNUNET_DISK_FileHandle));
935 return FD_ISSET (h->fd, &fds->sds);
941 * Checks if two fd sets overlap
942 * @param fds1 first fd set
943 * @param fds2 second fd set
944 * @return GNUNET_YES if they do overlap, GNUNET_NO otherwise
947 GNUNET_NETWORK_fdset_overlap (const struct GNUNET_NETWORK_FDSet *fds1,
948 const struct GNUNET_NETWORK_FDSet *fds2)
954 if (nfds > fds2->nsds)
959 if (FD_ISSET (nfds, &fds1->sds) && FD_ISSET (nfds, &fds2->sds))
963 struct GNUNET_CONTAINER_SList_Iterator *it;
964 struct GNUNET_DISK_FileHandle *h;
968 /*This code is somewhat hacky, we are not supposed to know what's
969 inside of fd_set; also the O(n^2) is really bad... */
971 for (i = 0; i < fds1->sds.fd_count; i++)
973 for (j = 0; j < fds2->sds.fd_count; j++)
975 if (fds1->sds.fd_array[i] == fds2->sds.fd_array[j])
979 it = GNUNET_CONTAINER_slist_begin (fds1->handles);
980 while (GNUNET_CONTAINER_slist_end (it) != GNUNET_YES)
982 h = (struct GNUNET_DISK_FileHandle *) GNUNET_CONTAINER_slist_get (it, NULL);
983 if (GNUNET_CONTAINER_slist_contains
984 (fds2->handles, h, sizeof (struct GNUNET_DISK_FileHandle)))
986 GNUNET_CONTAINER_slist_iter_destroy (it);
989 GNUNET_CONTAINER_slist_next (it);
991 GNUNET_CONTAINER_slist_iter_destroy (it);
999 * @return a new fd set
1001 struct GNUNET_NETWORK_FDSet *
1002 GNUNET_NETWORK_fdset_create ()
1004 struct GNUNET_NETWORK_FDSet *fds;
1005 fds = GNUNET_malloc (sizeof (struct GNUNET_NETWORK_FDSet));
1007 fds->handles = GNUNET_CONTAINER_slist_create ();
1009 GNUNET_NETWORK_fdset_zero (fds);
1015 * Releases the associated memory of an fd set
1019 GNUNET_NETWORK_fdset_destroy (struct GNUNET_NETWORK_FDSet *fds)
1022 GNUNET_CONTAINER_slist_destroy (fds->handles);
1028 * Check if sockets meet certain conditions
1029 * @param rfds set of sockets to be checked for readability
1030 * @param wfds set of sockets to be checked for writability
1031 * @param efds set of sockets to be checked for exceptions
1032 * @param timeout relative value when to return
1033 * @return number of selected sockets, GNUNET_SYSERR on error
1036 GNUNET_NETWORK_socket_select (struct GNUNET_NETWORK_FDSet *rfds,
1037 struct GNUNET_NETWORK_FDSet *wfds,
1038 struct GNUNET_NETWORK_FDSet *efds,
1039 const struct GNUNET_TIME_Relative timeout)
1053 handles = GNUNET_CONTAINER_slist_count (rfds->handles);
1058 nfds = GNUNET_MAX (nfds, wfds->nsds);
1060 handles += GNUNET_CONTAINER_slist_count (wfds->handles);
1065 nfds = GNUNET_MAX (nfds, efds->nsds);
1067 handles += GNUNET_CONTAINER_slist_count (efds->handles);
1072 tv.tv_sec = timeout.rel_value / GNUNET_TIME_UNIT_SECONDS.rel_value;
1074 1000 * (timeout.rel_value - (tv.tv_sec * GNUNET_TIME_UNIT_SECONDS.rel_value));
1075 if ((nfds == 0) && (timeout.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
1081 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1083 ("Fatal internal logic error, process hangs in `%s' (abort with CTRL-C)!\n"),
1088 return select (nfds,
1089 (rfds != NULL) ? &rfds->sds : NULL,
1090 (wfds != NULL) ? &wfds->sds : NULL,
1091 (efds != NULL) ? &efds->sds : NULL,
1092 (timeout.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
1097 fd_set sock_read, sock_write, sock_except;
1098 fd_set aread, awrite, aexcept;
1099 struct GNUNET_CONTAINER_SList *handles_read, *handles_write,
1103 struct timeval tvslice;
1107 #define SAFE_FD_ISSET(fd, set) (set != NULL && FD_ISSET(fd, set))
1109 /* calculate how long we need to wait in milliseconds */
1110 if (timeout.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
1111 ms_total = INFINITE;
1114 ms_total = timeout.rel_value / GNUNET_TIME_UNIT_MILLISECONDS.rel_value;
1116 /* select() may be used as a portable way to sleep */
1117 if (!(rfds || wfds || efds))
1124 handles_read = GNUNET_CONTAINER_slist_create ();
1125 handles_write = GNUNET_CONTAINER_slist_create ();
1126 handles_except = GNUNET_CONTAINER_slist_create ();
1129 sock_read = rfds->sds;
1131 FD_ZERO (&sock_read);
1133 sock_write = wfds->sds;
1135 FD_ZERO (&sock_write);
1137 sock_except = efds->sds;
1139 FD_ZERO (&sock_except);
1141 /* multiplex between winsock select() and waiting on the handles */
1145 limit = GetTickCount () + ms_total;
1154 /* overwrite the zero'd sets here; the select call
1155 * will clear those that are not active */
1156 FD_COPY (&sock_read, &aread);
1157 FD_COPY (&sock_write, &awrite);
1158 FD_COPY (&sock_except, &aexcept);
1160 tvslice.tv_usec = 100000;
1162 select (nfds + 1, &aread, &awrite, &aexcept,
1163 &tvslice)) == SOCKET_ERROR)
1166 SetErrnoFromWinsockError (WSAGetLastError ());
1167 if (errno == ENOTSOCK)
1171 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "select");
1174 goto select_loop_end;
1178 /* Poll read pipes */
1182 struct GNUNET_CONTAINER_SList_Iterator *i;
1183 for (i = GNUNET_CONTAINER_slist_begin (rfds->handles);
1184 GNUNET_CONTAINER_slist_end (i) != GNUNET_YES;
1185 GNUNET_CONTAINER_slist_next (i))
1188 struct GNUNET_DISK_FileHandle *fh;
1190 fh = (struct GNUNET_DISK_FileHandle *) GNUNET_CONTAINER_slist_get (i, NULL);
1191 if (fh->type == GNUNET_PIPE)
1193 if (!PeekNamedPipe (fh->h, NULL, 0, NULL, &dwBytes, NULL))
1195 DWORD error_code = GetLastError ();
1198 case ERROR_BROKEN_PIPE:
1199 GNUNET_CONTAINER_slist_add (handles_read,
1200 GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT,
1201 fh, sizeof (struct GNUNET_DISK_FileHandle));
1206 SetErrnoFromWinError (error_code);
1209 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
1213 goto select_loop_end;
1219 GNUNET_CONTAINER_slist_add (handles_read,
1220 GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT,
1221 fh, sizeof (struct GNUNET_DISK_FileHandle));
1227 /* Should we wait for more bytes to read here (in case of previous EOF)? */
1228 GNUNET_CONTAINER_slist_add (handles_read,
1229 GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT,
1230 fh, sizeof (struct GNUNET_DISK_FileHandle));
1233 GNUNET_CONTAINER_slist_iter_destroy (i);
1236 /* Poll for faulty pipes */
1240 struct GNUNET_CONTAINER_SList_Iterator *i;
1241 for (i = GNUNET_CONTAINER_slist_begin (efds->handles);
1242 GNUNET_CONTAINER_slist_end (i) != GNUNET_YES;
1243 GNUNET_CONTAINER_slist_next (i))
1246 struct GNUNET_DISK_FileHandle *fh;
1249 fh = (struct GNUNET_DISK_FileHandle *) GNUNET_CONTAINER_slist_get (i, NULL);
1250 if (fh->type == GNUNET_PIPE)
1252 if (!PeekNamedPipe (fh->h, NULL, 0, NULL, &dwBytes, NULL))
1255 GNUNET_CONTAINER_slist_add (handles_except,
1256 GNUNET_CONTAINER_SLIST_DISPOSITION_TRANSIENT,
1257 fh, sizeof (struct GNUNET_DISK_FileHandle));
1262 GNUNET_CONTAINER_slist_iter_destroy (i);
1267 GNUNET_CONTAINER_slist_append (handles_write, wfds->handles);
1268 retcode += GNUNET_CONTAINER_slist_count (wfds->handles);
1271 /* Check for closed sockets */
1272 for (i = 0; i < nfds; i++)
1275 if (SAFE_FD_ISSET (i, &sock_read))
1278 struct sockaddr addr;
1280 if (getpeername (i, &addr, &len) == SOCKET_ERROR)
1286 (i, SOL_SOCKET, SO_ERROR, (char *) &err, &len) == 0
1287 && err == WSAENOTCONN)
1290 if (!SAFE_FD_ISSET (i, &aread))
1301 if (retcode == 0 && nfds == 0)
1302 Sleep (GNUNET_MIN (100, limit - GetTickCount ()));
1304 while (retcode == 0 && (ms_total == INFINITE || GetTickCount () < limit));
1310 GNUNET_NETWORK_fdset_zero (rfds);
1311 GNUNET_NETWORK_fdset_copy_native (rfds, &aread, retcode);
1312 GNUNET_CONTAINER_slist_clear (rfds->handles);
1313 GNUNET_CONTAINER_slist_append (rfds->handles, handles_read);
1317 GNUNET_NETWORK_fdset_zero (wfds);
1318 GNUNET_NETWORK_fdset_copy_native (wfds, &awrite, retcode);
1319 GNUNET_CONTAINER_slist_clear (wfds->handles);
1320 GNUNET_CONTAINER_slist_append (wfds->handles, handles_write);
1324 GNUNET_NETWORK_fdset_zero (efds);
1325 GNUNET_NETWORK_fdset_copy_native (efds, &aexcept, retcode);
1326 GNUNET_CONTAINER_slist_clear (efds->handles);
1327 GNUNET_CONTAINER_slist_append (efds->handles, handles_except);
1331 GNUNET_CONTAINER_slist_destroy (handles_read);
1332 GNUNET_CONTAINER_slist_destroy (handles_write);
1333 GNUNET_CONTAINER_slist_destroy (handles_except);
1340 /* end of network.c */