WINGs/connection.c

   1 /*
   2  *  WINGs WMConnection function library
   3  *
   4  *  Copyright (c) 1999 Dan Pascu
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21
  22 /*
  23  * TODO:
  24  * - decide if we want to support connections with external sockets, else
  25  *   clean up the structure of the unneeded members.
  26  *
  27  */
  28
  29
  30 #include "../src/config.h"
  31
  32 #include <unistd.h>
  33 #include <fcntl.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <stdarg.h>
  38 #include <errno.h>
  39 #include <sys/socket.h>
  40 #include <netinet/in.h>
  41 #include <arpa/inet.h>
  42 #include <netdb.h>
  43 #include <signal.h>
  44 #ifdef __FreeBSD__
  45 #include <sys/signal.h>
  46 #endif
  47
  48 #include "WINGs.h"
  49
  50
  51 /* Some older systems does not define this (linux libc5, maybe others too) */
  52 #ifndef SHUT_RDWR
  53 # define SHUT_RDWR              2
  54 #endif
  55
  56 /* for SunOS */
  57 #ifndef SA_RESTART
  58 # define SA_RESTART             0
  59 #endif
  60
  61 /* Stuff for setting the sockets into non-blocking mode. */
  62 /*#ifdef        __POSIX_SOURCE
  63 # define NONBLOCK_OPT           O_NONBLOCK
  64 #else
  65 # define NONBLOCK_OPT           FNDELAY
  66 #endif*/
  67
  68 #define NONBLOCK_OPT            O_NONBLOCK
  69
  70
  71 #define NETBUF_SIZE             4096
  72
  73
  74 #define DEF_TIMEOUT             600   /* 600 seconds == 10 minutes */
  75
  76
  77 int WCErrorCode = 0;
  78
  79
  80
  81 static Bool SigInitialized = False;
  82
  83
  84
  85 typedef struct TimeoutData {
  86     unsigned timeout;
  87     WMHandlerID *handler;
  88 } TimeoutData;
  89
  90
  91
  92 typedef struct W_Connection {
  93     int sock;                     /* the socket we speak through */
  94
  95     struct {
  96         WMHandlerID *read;        /* the input read handler */
  97         WMHandlerID *write;       /* the input write handler */
  98         WMHandlerID *exception;   /* the input exception handler */
  99     } handler;
 100
 101     ConnectionDelegate *delegate; /* client delegates */
 102     void *clientData;             /* client data */
 103     unsigned int uflags;          /* flags for the client */
 104
 105     WMBag *outputQueue;
 106     unsigned bufPos;
 107
 108     TimeoutData sendTimeout;
 109
 110     WMConnectionState state;
 111
 112     char *address;
 113     char *service;
 114     char *protocol;
 115
 116     Bool closeOnRelease;
 117     Bool wasNonBlocking;
 118     Bool isNonBlocking;
 119
 120 } W_Connection;
 121
 122
 123
 124
 125 static void
 126 clearOutputQueue(WMConnection *cPtr) /*FOLD00*/
 127 {
 128     int i;
 129
 130     cPtr->bufPos = 0;
 131
 132     for (i=0; i<WMGetBagItemCount(cPtr->outputQueue); i++)
 133         WMReleaseData(WMGetFromBag(cPtr->outputQueue, i));
 134
 135     WMEmptyBag(cPtr->outputQueue);
 136 }
 137
 138
 139 static void
 140 sendTimeout(void *cdata) /*FOLD00*/
 141 {
 142     WMConnection *cPtr = (WMConnection*) cdata;
 143     TimeoutData *tPtr = &cPtr->sendTimeout;
 144
 145     tPtr->handler = NULL;
 146     if (cPtr->handler.write) {
 147         WMDeleteInputHandler(cPtr->handler.write);
 148         cPtr->handler.write = NULL;
 149     }
 150     if (WMGetBagItemCount(cPtr->outputQueue)>0) {
 151         clearOutputQueue(cPtr);
 152         if (cPtr->delegate && cPtr->delegate->didTimeout)
 153             (*cPtr->delegate->didTimeout)(cPtr->delegate, cPtr);
 154     }
 155 }
 156
 157
 158 static void
 159 inputHandler(int fd, int mask, void *clientData) /*FOLD00*/
 160 {
 161     WMConnection *cPtr = (WMConnection*)clientData;
 162
 163     if (cPtr->state==WCClosed || cPtr->state==WCDied)
 164         return;
 165
 166     if ((mask & WIWriteMask)) {
 167         if (cPtr->state == WCInProgress) {
 168             int result;
 169             int len = sizeof(result);
 170
 171             if (getsockopt(cPtr->sock, SOL_SOCKET, SO_ERROR,
 172                            (void*)&result, &len) == 0 && result != 0) {
 173                 cPtr->state = WCFailed;
 174                 WCErrorCode = result;
 175                 /* should call wsyserrorwithcode(result, ...) here? */
 176             } else {
 177                 cPtr->state = WCConnected;
 178             }
 179
 180             if (cPtr->handler.write) {
 181                 WMDeleteInputHandler(cPtr->handler.write);
 182                 cPtr->handler.write = NULL;
 183             }
 184
 185             if (cPtr->delegate && cPtr->delegate->didInitialize)
 186                 (*cPtr->delegate->didInitialize)(cPtr->delegate, cPtr);
 187
 188             if (cPtr->state == WCFailed)
 189                 return;
 190         } else if (cPtr->state == WCConnected) {
 191             WMFlushConnection(cPtr);
 192         }
 193     }
 194
 195     if (!cPtr->delegate)
 196         return;
 197
 198     /* if the connection died, may get destroyed in the delegate, so retain */
 199     wretain(cPtr);
 200
 201     if ((mask & WIReadMask) && cPtr->delegate->didReceiveInput)
 202         (*cPtr->delegate->didReceiveInput)(cPtr->delegate, cPtr);
 203
 204     if ((mask & WIExceptMask) && cPtr->delegate->didCatchException)
 205         (*cPtr->delegate->didCatchException)(cPtr->delegate, cPtr);
 206
 207     wrelease(cPtr);
 208 }
 209
 210
 211 static Bool
 212 setSocketNonBlocking(int sock, Bool flag) /*FOLD00*/
 213 {
 214     int state;
 215     Bool isNonBlock;
 216
 217     state = fcntl(sock, F_GETFL, 0);
 218
 219     if (state < 0) {
 220         wsyserror("Failed to get socket flags with fcntl.");
 221         return False;
 222     }
 223
 224     isNonBlock = (state & NONBLOCK_OPT) != 0;
 225
 226     if (flag) {
 227         if (isNonBlock)
 228             return True;
 229         state |= NONBLOCK_OPT;
 230     } else {
 231         if (!isNonBlock)
 232             return True;
 233         state &= ~NONBLOCK_OPT;
 234     }
 235
 236     if (fcntl(sock, F_SETFL, state) < 0) {
 237         wsyserror("Failed to set socket flags with fcntl.");
 238         return False;
 239     }
 240
 241     return True;
 242 }
 243
 244
 245 static void
 246 setConnectionAddress(WMConnection *cPtr, struct sockaddr_in *socketaddr) /*FOLD00*/
 247 {
 248     wassertr(cPtr->address==NULL);
 249
 250     cPtr->address = wstrdup(inet_ntoa(socketaddr->sin_addr));
 251     cPtr->service = wmalloc(16);
 252     sprintf(cPtr->service, "%hu", ntohs(socketaddr->sin_port));
 253     cPtr->protocol = wstrdup("tcp");
 254 }
 255
 256
 257 static struct sockaddr_in*
 258 getSocketAddress(char* name, char* service, char* protocol) /*FOLD00*/
 259 {
 260     static struct sockaddr_in socketaddr;
 261     struct servent *sp;
 262
 263     if (!protocol || protocol[0]=='\0')
 264         protocol = "tcp";
 265
 266     memset(&socketaddr, 0, sizeof(struct sockaddr_in));
 267     socketaddr.sin_family = AF_INET;
 268
 269     /*
 270      * If we were given a hostname, we use any address for that host.
 271      * Otherwise we expect the given name to be an address unless it is
 272      * NULL (any address).
 273      */
 274     if (name && name[0]!='\0') {
 275         WMHost *host = WMGetHostWithName(name);
 276
 277         if (!host)
 278             return NULL; /* name is not a hostname nor a number and dot adr */
 279
 280         name = WMGetHostAddress(host);
 281 #ifndef HAVE_INET_ATON
 282         if ((socketaddr.sin_addr.s_addr = inet_addr(name)) == INADDR_NONE) {
 283 #else
 284         if (inet_aton(name, &socketaddr.sin_addr) == 0) {
 285 #endif
 286             WMReleaseHost(host);
 287             return NULL;
 288         }
 289         WMReleaseHost(host);
 290     } else {
 291         socketaddr.sin_addr.s_addr = htonl(INADDR_ANY);
 292     }
 293
 294     if (!service || service[0]=='\0') {
 295         socketaddr.sin_port = 0;
 296     } else if ((sp = getservbyname(service, protocol))==0) {
 297         char *endptr;
 298         unsigned portNumber;
 299
 300         portNumber = strtoul(service, &endptr, 10);
 301
 302         if (service[0]!='\0' && *endptr=='\0' && portNumber<65536) {
 303             socketaddr.sin_port = htons(portNumber);
 304         } else {
 305             return NULL;
 306         }
 307     } else {
 308         socketaddr.sin_port = sp->s_port;
 309     }
 310
 311     return &socketaddr;
 312 }
 313
 314
 315 static WMConnection*
 316 createConnectionWithSocket(int sock, Bool closeOnRelease) /*FOLD00*/
 317 {
 318     WMConnection *cPtr;
 319     struct sigaction sig_action;
 320
 321     cPtr = wmalloc(sizeof(WMConnection));
 322     wretain(cPtr);
 323     memset(cPtr, 0, sizeof(WMConnection));
 324
 325     cPtr->sock = sock;
 326     cPtr->sendTimeout.timeout = DEF_TIMEOUT;
 327     cPtr->sendTimeout.handler = NULL;
 328     cPtr->closeOnRelease = closeOnRelease;
 329     cPtr->outputQueue = WMCreateBag(16);
 330     cPtr->state = WCNotConnected;
 331
 332     /* ignore dead pipe */
 333     if (!SigInitialized) {
 334         sig_action.sa_handler = SIG_IGN;
 335         sig_action.sa_flags = SA_RESTART;
 336         sigaction(SIGPIPE, &sig_action, NULL);
 337         SigInitialized = True;
 338     }
 339
 340     return cPtr;
 341 }
 342
 343
 344 #if 0
 345 WMConnection*
 346 WMCreateConnectionWithSocket(int sock, Bool closeOnRelease) /*FOLD00*/
 347 {
 348     WMConnection *cPtr;
 349     struct sockaddr_in clientname;
 350     int size, n;
 351
 352     cPtr = createConnectionWithSocket(sock, closeOnRelease);
 353     cPtr->wasNonBlocking = WMIsConnectionNonBlocking(cPtr);
 354     cPtr->isNonBlocking = cPtr->wasNonBlocking;
 355
 356     // some way to find out if it is connected, and binded. can't find
 357     // if it listens though!!!
 358
 359     size = sizeof(clientname);
 360     n = getpeername(sock, (struct sockaddr*) &clientname, &size);
 361     if (n==0) {
 362         /* Since we have a peer, it means we are connected */
 363         cPtr->state = WCConnected;
 364     } else {
 365         size = sizeof(clientname);
 366         n = getsockname(sock, (struct sockaddr*) &clientname, &size);
 367         if (n==0) {
 368             /* We don't have a peer, but we are binded to an address.
 369              * Assume we are listening on it (we don't know that for sure!)
 370              */
 371             cPtr->state = WCListening;
 372         } else {
 373             cPtr->state = WCNotConnected;
 374         }
 375     }
 376
 377     return cPtr;
 378 }
 379 #endif
 380
 381
 382 /*
 383  * host     is the name on which we want to listen for incoming connections,
 384  *          and it must be a name of this host, or NULL if we want to listen
 385  *          on any incoming address.
 386  * service  is either a service name as present in /etc/services, or the port
 387  *          number we want to listen on. If NULL, a random port between
 388  *          1024 and 65535 will be assigned to us.
 389  * protocol is one of "tcp" or "udp". If NULL, "tcp" will be used by default.
 390  *          currently only "tcp" is supported.
 391  */
 392 WMConnection*
 393 WMCreateConnectionAsServerAtAddress(char *host, char *service, char *protocol) /*FOLD00*/
 394 {
 395     WMConnection *cPtr;
 396     struct sockaddr_in *socketaddr;
 397     int sock, size, on;
 398
 399     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 400         WCErrorCode = 0;
 401         wwarning("Bad address-service-protocol combination");
 402         return NULL;
 403     }
 404
 405     /* Create the actual socket */
 406     sock = socket(PF_INET, SOCK_STREAM, 0);
 407     if (sock<0) {
 408         WCErrorCode = errno;
 409         wsyserror("Unable to create socket");
 410         return NULL;
 411     }
 412
 413     /*
 414      * Set socket options. We try to make the port reusable and have it
 415      * close as fast as possible without waiting in unnecessary wait states
 416      * on close.
 417      */
 418     on = 1;
 419     setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
 420
 421     if (bind(sock, (struct sockaddr *)socketaddr, sizeof(*socketaddr)) < 0) {
 422         WCErrorCode = errno;
 423         wsyserror("Unable to bind to address '%s:%hu'",
 424                   inet_ntoa(socketaddr->sin_addr),
 425                   ntohs(socketaddr->sin_port));
 426         close(sock);
 427         return NULL;
 428     }
 429
 430     if (listen(sock, 10) < 0) {
 431         WCErrorCode = errno;
 432         wsyserror("Unable to listen on port '%hu'",
 433                   ntohs(socketaddr->sin_port));
 434         close(sock);
 435         return NULL;
 436     }
 437
 438     /* Find out what is the address/service/protocol we get */
 439     /* In case some of address/service/protocol were NULL */
 440     size = sizeof(*socketaddr);
 441     if (getsockname(sock, (struct sockaddr*)socketaddr, &size) < 0) {
 442         WCErrorCode = errno;
 443         wsyserror("Unable to get socket address");
 444         close(sock);
 445         return NULL;
 446     }
 447
 448     cPtr = createConnectionWithSocket(sock, True);
 449     cPtr->state = WCListening;
 450     WMSetConnectionNonBlocking(cPtr, True);
 451
 452     setConnectionAddress(cPtr, socketaddr);
 453
 454     return cPtr;
 455 }
 456
 457
 458 WMConnection*
 459 WMCreateConnectionToAddress(char *host, char *service, char *protocol) /*FOLD00*/
 460 {
 461     WMConnection *cPtr;
 462     struct sockaddr_in *socketaddr;
 463     int sock;
 464
 465     if (service==NULL || service[0]=='\0') {
 466         WCErrorCode = 0;
 467         wwarning("Bad argument - service is not specified");
 468         return NULL;
 469     }
 470
 471     if (host==NULL || host[0]=='\0')
 472         host = "localhost";
 473
 474     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 475         WCErrorCode = 0;
 476         wwarning("Bad address-service-protocol combination");
 477         return NULL;
 478     }
 479
 480     /* Create the actual socket */
 481     sock = socket(PF_INET, SOCK_STREAM, 0);
 482     if (sock<0) {
 483         WCErrorCode = errno;
 484         wsyserror("Unable to create socket");
 485         return NULL;
 486     }
 487     /* make socket blocking while we connect. */
 488     setSocketNonBlocking(sock, False);
 489     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 490         WCErrorCode = errno;
 491         wsyserror("Unable to make connection to address '%s:%hu'",
 492                   inet_ntoa(socketaddr->sin_addr),
 493                   ntohs(socketaddr->sin_port));
 494         close(sock);
 495         return NULL;
 496     }
 497
 498     cPtr = createConnectionWithSocket(sock, True);
 499     cPtr->state = WCConnected;
 500     WMSetConnectionNonBlocking(cPtr, True);
 501     setConnectionAddress(cPtr, socketaddr);
 502
 503     return cPtr;
 504 }
 505
 506
 507 WMConnection*
 508 WMCreateConnectionToAddressAndNotify(char *host, char *service, char *protocol) /*FOLD00*/
 509 {
 510     WMConnection *cPtr;
 511     /*TimeoutData *tPtr;*/
 512     struct sockaddr_in *socketaddr;
 513     int sock;
 514     Bool isNonBlocking;
 515
 516     if (service==NULL || service[0]=='\0') {
 517         WCErrorCode = 0;
 518         wwarning("Bad argument - service is not specified");
 519         return NULL;
 520     }
 521
 522     if (host==NULL || host[0]=='\0')
 523         host = "localhost";
 524
 525     if ((socketaddr = getSocketAddress(host, service, protocol)) == NULL) {
 526         WCErrorCode = 0;
 527         wwarning("Bad address-service-protocol combination");
 528         return NULL;
 529     }
 530
 531     /* Create the actual socket */
 532     sock = socket(PF_INET, SOCK_STREAM, 0);
 533     if (sock<0) {
 534         WCErrorCode = errno;
 535         wsyserror("Unable to create socket");
 536         return NULL;
 537     }
 538     isNonBlocking = setSocketNonBlocking(sock, True);
 539     if (connect(sock, (struct sockaddr*)socketaddr, sizeof(*socketaddr)) < 0) {
 540         if (errno!=EINPROGRESS) {
 541             WCErrorCode = errno;
 542             wsyserror("Unable to make connection to address '%s:%hu'",
 543                       inet_ntoa(socketaddr->sin_addr),
 544                       ntohs(socketaddr->sin_port));
 545             close(sock);
 546             return NULL;
 547         }
 548     }
 549
 550     cPtr = createConnectionWithSocket(sock, True);
 551     cPtr->state = WCInProgress;
 552     cPtr->isNonBlocking = isNonBlocking;
 553
 554     /*tPtr = &cPtr->sendTimeout;
 555      tPtr->handler = WMAddTimerHandler(tPtr->timeout*1000, connectTimeout, cPtr);
 556     */
 557     cPtr->handler.write = WMAddInputHandler(cPtr->sock, WIWriteMask,
 558                                             inputHandler, cPtr);
 559
 560     setConnectionAddress(cPtr, socketaddr);
 561
 562     return cPtr;
 563 }
 564
 565
 566 static void
 567 removeAllHandlers(WMConnection *cPtr) /*FOLD00*/
 568 {
 569     if (cPtr->handler.read)
 570         WMDeleteInputHandler(cPtr->handler.read);
 571     if (cPtr->handler.write)
 572         WMDeleteInputHandler(cPtr->handler.write);
 573     if (cPtr->handler.exception)
 574         WMDeleteInputHandler(cPtr->handler.exception);
 575     if (cPtr->sendTimeout.handler)
 576         WMDeleteTimerHandler(cPtr->sendTimeout.handler);
 577
 578     cPtr->handler.read = NULL;
 579     cPtr->handler.write = NULL;
 580     cPtr->handler.exception = NULL;
 581     cPtr->sendTimeout.handler = NULL;
 582 }
 583
 584
 585 void
 586 WMDestroyConnection(WMConnection *cPtr) /*FOLD00*/
 587 {
 588     if (cPtr->closeOnRelease && cPtr->sock>=0) {
 589         shutdown(cPtr->sock, SHUT_RDWR);
 590         close(cPtr->sock);
 591     }
 592
 593     removeAllHandlers(cPtr);
 594     clearOutputQueue(cPtr);
 595     WMFreeBag(cPtr->outputQueue);
 596
 597     if (cPtr->address) {
 598         wfree(cPtr->address);
 599         wfree(cPtr->service);
 600         wfree(cPtr->protocol);
 601     }
 602
 603     wrelease(cPtr);
 604 }
 605
 606
 607 void
 608 WMCloseConnection(WMConnection *cPtr) /*FOLD00*/
 609 {
 610     if (cPtr->sock>=0) {
 611         shutdown(cPtr->sock, SHUT_RDWR);
 612         close(cPtr->sock);
 613         cPtr->sock = -1;
 614     }
 615
 616     removeAllHandlers(cPtr);
 617     clearOutputQueue(cPtr);
 618
 619     cPtr->state = WCClosed;
 620 }
 621
 622
 623 WMConnection*
 624 WMAcceptConnection(WMConnection *listener) /*FOLD00*/
 625 {
 626     struct sockaddr_in clientname;
 627     int size;
 628     int newSock;
 629     WMConnection *newConnection;
 630
 631     if (listener->state!=WCListening) {
 632         wwarning("Called 'WMAcceptConnection()' on a non-listening connection");
 633         WCErrorCode = 0;
 634         return NULL;
 635     }
 636
 637     size = sizeof(clientname);
 638     newSock = accept(listener->sock, (struct sockaddr*) &clientname, &size);
 639     if (newSock<0) {
 640         if (errno!=EAGAIN && errno!=EWOULDBLOCK) {
 641             WCErrorCode = errno;
 642             wsyserror("Could not accept connection");
 643         } else {
 644             WCErrorCode = 0;
 645         }
 646         return NULL;
 647     }
 648
 649     newConnection = createConnectionWithSocket(newSock, True);
 650     WMSetConnectionNonBlocking(newConnection, True);
 651     newConnection->state = WCConnected;
 652     setConnectionAddress(newConnection, &clientname);
 653
 654     return newConnection;
 655 }
 656
 657
 658 char*
 659 WMGetConnectionAddress(WMConnection *cPtr) /*FOLD00*/
 660 {
 661     return cPtr->address;
 662 }
 663
 664
 665 char*
 666 WMGetConnectionService(WMConnection *cPtr) /*FOLD00*/
 667 {
 668     return cPtr->service;
 669 }
 670
 671
 672 char*
 673 WMGetConnectionProtocol(WMConnection *cPtr)
 674 {
 675     return cPtr->protocol;
 676 }
 677
 678
 679 int
 680 WMGetConnectionSocket(WMConnection *cPtr) /*FOLD00*/
 681 {
 682     return cPtr->sock;
 683 }
 684
 685
 686 WMConnectionState
 687 WMGetConnectionState(WMConnection *cPtr) /*FOLD00*/
 688 {
 689     return cPtr->state;
 690 }
 691
 692
 693 Bool
 694 WMEnqueueConnectionData(WMConnection *cPtr, WMData *data) /*FOLD00*/
 695 {
 696     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, False);
 697     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, False);
 698
 699     if (cPtr->state!=WCConnected)
 700         return False;
 701
 702     WMPutInBag(cPtr->outputQueue, WMRetainData(data));
 703     return True;
 704 }
 705
 706
 707 int
 708 WMSendConnectionData(WMConnection *cPtr, WMData *data) /*FOLD00*/
 709 {
 710     int bytes, pos, len, totalTransfer;
 711     TimeoutData *tPtr = &cPtr->sendTimeout;
 712     const void *dataBytes;
 713
 714     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, -1);
 715     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, -1);
 716
 717     if (cPtr->state!=WCConnected)
 718         return -1;
 719
 720     /* If we have no data just flush the queue, else try to send data */
 721     if (data && WMGetDataLength(data)>0) {
 722         WMPutInBag(cPtr->outputQueue, WMRetainData(data));
 723         /* If there already was something in queue, and also a write input
 724          * handler is established, it means we were unable to send, so
 725          * return and let the write handler notify us when we can send.
 726          */
 727         if (WMGetBagItemCount(cPtr->outputQueue)>1 && cPtr->handler.write)
 728             return 0;
 729     }
 730
 731     totalTransfer = 0;
 732
 733     while (WMGetBagItemCount(cPtr->outputQueue) > 0) {
 734         data = WMGetFromBag(cPtr->outputQueue, 0);
 735         dataBytes = WMDataBytes(data);
 736         len = WMGetDataLength(data);
 737         pos = cPtr->bufPos; /* where we're left last time */
 738         while(pos < len) {
 739         again:
 740             bytes = write(cPtr->sock, dataBytes+pos, len - pos);
 741             if(bytes<0) {
 742                 switch (errno) {
 743                 case EINTR:
 744                     goto again;
 745                 case EWOULDBLOCK:
 746                     /* save the position where we're left and add a timeout */
 747                     cPtr->bufPos = pos;
 748                     if (!tPtr->handler) {
 749                         tPtr->handler = WMAddTimerHandler(tPtr->timeout*1000,
 750                                                           sendTimeout, cPtr);
 751                     }
 752                     if (!cPtr->handler.write) {
 753                         cPtr->handler.write =
 754                             WMAddInputHandler(cPtr->sock, WIWriteMask,
 755                                               inputHandler, cPtr);
 756                     }
 757                     return totalTransfer;
 758                 default:
 759                     WCErrorCode = errno;
 760                     cPtr->state = WCDied;
 761                     /*clearOutputQueue(cPtr);*/
 762                     removeAllHandlers(cPtr);
 763                     if (cPtr->delegate && cPtr->delegate->didDie)
 764                         (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 765                     return -1;
 766                 }
 767             }
 768             pos += bytes;
 769             totalTransfer += bytes;
 770         }
 771         WMReleaseData(data);
 772         WMDeleteFromBag(cPtr->outputQueue, 0);
 773         cPtr->bufPos = 0;
 774         if (tPtr->handler) {
 775             WMDeleteTimerHandler(tPtr->handler);
 776             tPtr->handler = NULL;
 777         }
 778         if (cPtr->handler.write) {
 779             WMDeleteInputHandler(cPtr->handler.write);
 780             cPtr->handler.write = NULL;
 781         }
 782     }
 783
 784     return totalTransfer;
 785 }
 786
 787
 788 /*
 789  * WMGetConnectionAvailableData(connection):
 790  *
 791  * will return a WMData structure containing the available data on the
 792  * specified connection. If connection is non-blocking (default) and no data
 793  * is available when this function is called, an empty WMData is returned.
 794  *
 795  * If an error occurs while reading or the other side closed connection,
 796  * it will return NULL.
 797  * Also trying to read from an already died or closed connection is
 798  * considered to be an error condition, and will return NULL.
 799  */
 800 WMData*
 801 WMGetConnectionAvailableData(WMConnection *cPtr) /*FOLD00*/
 802 {
 803     char buffer[NETBUF_SIZE];
 804     int nbytes;
 805     WMData *aData;
 806
 807     wassertrv(cPtr->state!=WCNotConnected && cPtr->state!=WCListening, NULL);
 808     wassertrv(cPtr->state!=WCInProgress && cPtr->state!=WCFailed, NULL);
 809
 810     if (cPtr->state!=WCConnected)
 811         return NULL;
 812
 813     aData = NULL;
 814
 815 again:
 816     nbytes = read(cPtr->sock, buffer, NETBUF_SIZE);
 817     if (nbytes<0) {
 818         switch (errno) {
 819         case EINTR:
 820             goto again;
 821         case EWOULDBLOCK:
 822             aData = WMCreateDataWithCapacity(0);
 823             break;
 824         default:
 825             WCErrorCode = errno;
 826             cPtr->state = WCDied;
 827             removeAllHandlers(cPtr);
 828             if (cPtr->delegate && cPtr->delegate->didDie)
 829                 (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 830             break;
 831         }
 832     } else if (nbytes==0) {      /* the other side has closed connection */
 833         cPtr->state = WCClosed;
 834         removeAllHandlers(cPtr);
 835         if (cPtr->delegate && cPtr->delegate->didDie)
 836             (*cPtr->delegate->didDie)(cPtr->delegate, cPtr);
 837     } else {
 838         aData = WMCreateDataWithBytes(buffer, nbytes);
 839     }
 840
 841     return aData;
 842 }
 843
 844
 845 void
 846 WMSetConnectionDelegate(WMConnection *cPtr, ConnectionDelegate *delegate) /*FOLD00*/
 847 {
 848     wassertr(cPtr->sock >= 0);
 849     /* Don't try to set the delegate multiple times */
 850     wassertr(cPtr->delegate == NULL);
 851
 852     cPtr->delegate = delegate;
 853     if (delegate && delegate->didReceiveInput && !cPtr->handler.read)
 854         cPtr->handler.read = WMAddInputHandler(cPtr->sock, WIReadMask,
 855                                                inputHandler, cPtr);
 856     if (delegate && delegate->didCatchException && !cPtr->handler.exception)
 857         cPtr->handler.exception = WMAddInputHandler(cPtr->sock, WIExceptMask,
 858                                                     inputHandler, cPtr);
 859 }
 860
 861
 862 #if 0
 863 Bool
 864 WMIsConnectionNonBlocking(WMConnection *cPtr) /*FOLD00*/
 865 {
 866 #if 1
 867     int state;
 868
 869     state = fcntl(cPtr->sock, F_GETFL, 0);
 870
 871     if (state < 0) {
 872         wsyserror("Failed to get socket flags with fcntl.");
 873         /* If we can't use fcntl on socket, this probably also means we could
 874          * not use fcntl to set non-blocking mode, and since a socket defaults
 875          * to blocking when created, return False as the best assumption */
 876         return False;
 877     }
 878
 879     return ((state & NONBLOCK_OPT)!=0);
 880 #else
 881     return cPtr->isNonBlocking;
 882 #endif
 883 }
 884 #endif
 885
 886
 887 void
 888 WMSetConnectionNonBlocking(WMConnection *cPtr, Bool flag) /*FOLD00*/
 889 {
 890     if (cPtr->sock < 0)
 891         return;
 892
 893     if (cPtr->isNonBlocking == flag)
 894         return;
 895
 896     if (setSocketNonBlocking(cPtr->sock, flag)==True)
 897         cPtr->isNonBlocking = flag;
 898 }
 899
 900
 901 void*
 902 WMGetConnectionClientData(WMConnection *cPtr) /*FOLD00*/
 903 {
 904     return cPtr->clientData;
 905 }
 906
 907
 908 void
 909 WMSetConnectionClientData(WMConnection *cPtr, void *data) /*FOLD00*/
 910 {
 911     cPtr->clientData = data;
 912 }
 913
 914
 915 unsigned int
 916 WMGetConnectionFlags(WMConnection *cPtr) /*FOLD00*/
 917 {
 918     return cPtr->uflags;
 919 }
 920
 921
 922 void
 923 WMSetConnectionFlags(WMConnection *cPtr, unsigned int flags) /*FOLD00*/
 924 {
 925     cPtr->uflags = flags;
 926 }
 927
 928
 929 void
 930 WMSetConnectionSendTimeout(WMConnection *cPtr, unsigned int timeout) /*FOLD00*/
 931 {
 932     if (timeout == 0)
 933         timeout = DEF_TIMEOUT;
 934
 935     cPtr->sendTimeout.timeout = timeout;
 936 }
 937
 938