sys/kern/uipc_msg.c

   1 /*
   2  * Copyright (c) 2003, 2004 Jeffrey M. Hsu.  All rights reserved.
   3  * Copyright (c) 2003, 2004 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Jeffrey M. Hsu.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of The DragonFly Project nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific, prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $DragonFly: src/sys/kern/uipc_msg.c,v 1.19 2007/07/04 23:36:26 dillon Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/msgport.h>
  39 #include <sys/protosw.h>
  40 #include <sys/socket.h>
  41 #include <sys/socketvar.h>
  42 #include <sys/socketops.h>
  43 #include <sys/thread.h>
  44 #include <sys/thread2.h>
  45 #include <sys/msgport2.h>
  46 #include <net/netmsg2.h>
  47
  48 #include <net/netisr.h>
  49 #include <net/netmsg.h>
  50
  51 int
  52 so_pru_abort(struct socket *so)
  53 {
  54         int error;
  55         struct netmsg_pru_abort msg;
  56         lwkt_port_t port;
  57
  58         port = so->so_proto->pr_mport(so, NULL, PRU_ABORT);
  59         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
  60                     netmsg_pru_abort);
  61         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_abort;
  62         msg.nm_so = so;
  63         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
  64         return (error);
  65 }
  66
  67 int
  68 so_pru_accept(struct socket *so, struct sockaddr **nam)
  69 {
  70         /* Block (memory allocation) in process context. XXX JH */
  71         return ((*so->so_proto->pr_usrreqs->pru_accept)(so, nam));
  72
  73 #ifdef notdef
  74         int error;
  75         struct netmsg_pru_accept msg;
  76         lwkt_port_t port;
  77
  78         port = so->so_proto->pr_mport(so, NULL, PRU_ACCEPT);
  79         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
  80                     netmsg_pru_accept);
  81         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_accept;
  82         msg.nm_so = so;
  83         msg.nm_nam = nam;
  84         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
  85         return (error);
  86 #endif
  87 }
  88
  89 int
  90 so_pru_attach(struct socket *so, int proto, struct pru_attach_info *ai)
  91 {
  92         int error;
  93         struct netmsg_pru_attach msg;
  94         lwkt_port_t port;
  95
  96         port = so->so_proto->pr_mport(NULL, NULL, PRU_ATTACH);
  97         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
  98                     netmsg_pru_attach);
  99         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_attach;
 100         msg.nm_so = so;
 101         msg.nm_proto = proto;
 102         msg.nm_ai = ai;
 103         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 104         return (error);
 105 }
 106
 107 int
 108 so_pru_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 109 {
 110         int error;
 111         struct netmsg_pru_bind msg;
 112         lwkt_port_t port;
 113
 114         /* Send mesg to thread for new address. */
 115         port = so->so_proto->pr_mport(NULL, nam, PRU_BIND);
 116         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 117                     netmsg_pru_bind);
 118         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_bind;
 119         msg.nm_so = so;
 120         msg.nm_nam = nam;
 121         msg.nm_td = td;         /* used only for prison_ip() XXX JH */
 122         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 123         return (error);
 124 }
 125
 126 int
 127 so_pru_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 128 {
 129         int error;
 130         struct netmsg_pru_connect msg;
 131         lwkt_port_t port;
 132
 133         port = so->so_proto->pr_mport(so, nam, PRU_CONNECT);
 134         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 135                     netmsg_pru_connect);
 136         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_connect;
 137         msg.nm_so = so;
 138         msg.nm_nam = nam;
 139         msg.nm_td = td;
 140         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 141         return (error);
 142 }
 143
 144 int
 145 so_pru_connect2(struct socket *so1, struct socket *so2)
 146 {
 147         int error;
 148         struct netmsg_pru_connect2 msg;
 149         lwkt_port_t port;
 150
 151         port = so1->so_proto->pr_mport(so1, NULL, PRU_CONNECT2);
 152         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 153                     netmsg_pru_connect2);
 154         msg.nm_prufn = so1->so_proto->pr_usrreqs->pru_connect2;
 155         msg.nm_so1 = so1;
 156         msg.nm_so2 = so2;
 157         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 158         return (error);
 159 }
 160
 161 int
 162 so_pru_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp)
 163 {
 164         return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, ifp,
 165             curthread));
 166 #ifdef gag      /* does copyin and copyout deep inside stack XXX JH */
 167         int error;
 168         struct netmsg_pru_control msg;
 169         lwkt_port_t port;
 170
 171         port = so->so_proto->pr_mport(so, NULL, PRU_CONTROL);
 172         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 173                     netmsg_pru_control);
 174         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_control;
 175         msg.nm_so = so;
 176         msg.nm_cmd = cmd;
 177         msg.nm_data = data;
 178         msg.nm_ifp = ifp;
 179         msg.nm_td = td;
 180         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 181         return (error);
 182 #endif
 183 }
 184
 185 int
 186 so_pru_detach(struct socket *so)
 187 {
 188         int error;
 189         struct netmsg_pru_detach msg;
 190         lwkt_port_t port;
 191
 192         port = so->so_proto->pr_mport(so, NULL, PRU_DETACH);
 193         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 194                     netmsg_pru_detach);
 195         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_detach;
 196         msg.nm_so = so;
 197         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 198         return (error);
 199 }
 200
 201 int
 202 so_pru_disconnect(struct socket *so)
 203 {
 204         int error;
 205         struct netmsg_pru_disconnect msg;
 206         lwkt_port_t port;
 207
 208         port = so->so_proto->pr_mport(so, NULL, PRU_DISCONNECT);
 209         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 210                     netmsg_pru_disconnect);
 211         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_disconnect;
 212         msg.nm_so = so;
 213         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 214         return (error);
 215 }
 216
 217 int
 218 so_pru_listen(struct socket *so, struct thread *td)
 219 {
 220         int error;
 221         struct netmsg_pru_listen msg;
 222         lwkt_port_t port;
 223
 224         port = so->so_proto->pr_mport(so, NULL, PRU_LISTEN);
 225         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 226                     netmsg_pru_listen);
 227         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_listen;
 228         msg.nm_so = so;
 229         msg.nm_td = td;         /* used only for prison_ip() XXX JH */
 230         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 231         return (error);
 232 }
 233
 234 int
 235 so_pru_peeraddr(struct socket *so, struct sockaddr **nam)
 236 {
 237         int error;
 238         struct netmsg_pru_peeraddr msg;
 239         lwkt_port_t port;
 240
 241         port = so->so_proto->pr_mport(so, NULL, PRU_PEERADDR);
 242         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 243                     netmsg_pru_peeraddr);
 244         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_peeraddr;
 245         msg.nm_so = so;
 246         msg.nm_nam = nam;
 247         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 248         return (error);
 249 }
 250
 251 int
 252 so_pru_rcvd(struct socket *so, int flags)
 253 {
 254         int error;
 255         struct netmsg_pru_rcvd msg;
 256         lwkt_port_t port;
 257
 258         port = so->so_proto->pr_mport(so, NULL, PRU_RCVD);
 259         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 260                     netmsg_pru_rcvd);
 261         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_rcvd;
 262         msg.nm_so = so;
 263         msg.nm_flags = flags;
 264         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 265         return (error);
 266 }
 267
 268 int
 269 so_pru_rcvoob(struct socket *so, struct mbuf *m, int flags)
 270 {
 271         int error;
 272         struct netmsg_pru_rcvoob msg;
 273         lwkt_port_t port;
 274
 275         port = so->so_proto->pr_mport(so, NULL, PRU_RCVOOB);
 276         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 277                     netmsg_pru_rcvoob);
 278         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_rcvoob;
 279         msg.nm_so = so;
 280         msg.nm_m = m;
 281         msg.nm_flags = flags;
 282         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 283         return (error);
 284 }
 285
 286 int
 287 so_pru_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 288     struct mbuf *control, struct thread *td)
 289 {
 290         int error;
 291         struct netmsg_pru_send msg;
 292         lwkt_port_t port;
 293
 294         port = so->so_proto->pr_mport(so, NULL, PRU_SEND);
 295         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 296                     netmsg_pru_send);
 297         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_send;
 298         msg.nm_so = so;
 299         msg.nm_flags = flags;
 300         msg.nm_m = m;
 301         msg.nm_addr = addr;
 302         msg.nm_control = control;
 303         msg.nm_td = td;
 304         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 305         return (error);
 306 }
 307
 308 int
 309 so_pru_sense(struct socket *so, struct stat *sb)
 310 {
 311         int error;
 312         struct netmsg_pru_sense msg;
 313         lwkt_port_t port;
 314
 315         port = so->so_proto->pr_mport(so, NULL, PRU_SENSE);
 316         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 317                     netmsg_pru_sense);
 318         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sense;
 319         msg.nm_so = so;
 320         msg.nm_stat = sb;
 321         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 322         return (error);
 323 }
 324
 325 int
 326 so_pru_shutdown(struct socket *so)
 327 {
 328         int error;
 329         struct netmsg_pru_shutdown msg;
 330         lwkt_port_t port;
 331
 332         port = so->so_proto->pr_mport(so, NULL, PRU_SHUTDOWN);
 333         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 334                     netmsg_pru_shutdown);
 335         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_shutdown;
 336         msg.nm_so = so;
 337         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 338         return (error);
 339 }
 340
 341 int
 342 so_pru_sockaddr(struct socket *so, struct sockaddr **nam)
 343 {
 344         int error;
 345         struct netmsg_pru_sockaddr msg;
 346         lwkt_port_t port;
 347
 348         port = so->so_proto->pr_mport(so, NULL, PRU_SOCKADDR);
 349         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 350                     netmsg_pru_sockaddr);
 351         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sockaddr;
 352         msg.nm_so = so;
 353         msg.nm_nam = nam;
 354         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 355         return (error);
 356 }
 357
 358 int
 359 so_pru_sopoll(struct socket *so, int events, struct ucred *cred)
 360 {
 361         int error;
 362         struct netmsg_pru_sopoll msg;
 363         lwkt_port_t port;
 364
 365         port = so->so_proto->pr_mport(so, NULL, PRU_SOPOLL);
 366         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 367                     netmsg_pru_sopoll);
 368         msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sopoll;
 369         msg.nm_so = so;
 370         msg.nm_events = events;
 371         msg.nm_cred = cred;
 372         msg.nm_td = curthread;
 373         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 374         return (error);
 375 }
 376
 377 int
 378 so_pr_ctloutput(struct socket *so, struct sockopt *sopt)
 379 {
 380         return ((*so->so_proto->pr_ctloutput)(so, sopt));
 381 #ifdef gag      /* does copyin and copyout deep inside stack XXX JH */
 382         struct netmsg_pr_ctloutput msg;
 383         lwkt_port_t port;
 384         int error;
 385
 386         port = so->so_proto->pr_mport(so, NULL);
 387         netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 388                     netmsg_pru_ctloutput);
 389         msg.nm_prfn = so->so_proto->pr_ctloutput;
 390         msg.nm_so = so;
 391         msg.nm_sopt = sopt;
 392         error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
 393         return (error);
 394 #endif
 395 }
 396
 397 /*
 398  * If we convert all the protosw pr_ functions for all the protocols
 399  * to take a message directly, this layer can go away.  For the moment
 400  * our dispatcher ignores the return value, but since we are handling
 401  * the replymsg ourselves we return EASYNC by convention.
 402  */
 403 void
 404 netmsg_pru_abort(netmsg_t msg)
 405 {
 406         struct netmsg_pru_abort *nm = (void *)msg;
 407
 408         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
 409 }
 410
 411 #ifdef notused
 412 void
 413 netmsg_pru_accept(netmsg_t msg)
 414 {
 415         struct netmsg_pru_accept *nm = (void *)msg;
 416
 417         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
 418 }
 419 #endif
 420
 421 void
 422 netmsg_pru_attach(netmsg_t msg)
 423 {
 424         struct netmsg_pru_attach *nm = (void *)msg;
 425
 426         lwkt_replymsg(&msg->nm_lmsg,
 427                       nm->nm_prufn(nm->nm_so, nm->nm_proto, nm->nm_ai));
 428 }
 429
 430 void
 431 netmsg_pru_bind(netmsg_t msg)
 432 {
 433         struct netmsg_pru_bind *nm = (void *)msg;
 434
 435         lwkt_replymsg(&msg->nm_lmsg,
 436                       nm->nm_prufn(nm->nm_so, nm->nm_nam, nm->nm_td));
 437 }
 438
 439 void
 440 netmsg_pru_connect(netmsg_t msg)
 441 {
 442         struct netmsg_pru_connect *nm = (void *)msg;
 443
 444         lwkt_replymsg(&msg->nm_lmsg,
 445                       nm->nm_prufn(nm->nm_so, nm->nm_nam, nm->nm_td));
 446 }
 447
 448 void
 449 netmsg_pru_connect2(netmsg_t msg)
 450 {
 451         struct netmsg_pru_connect2 *nm = (void *)msg;
 452
 453         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so1, nm->nm_so2));
 454 }
 455
 456 void
 457 netmsg_pru_control(netmsg_t msg)
 458 {
 459         struct netmsg_pru_control *nm = (void *)msg;
 460         int error;
 461
 462         error = nm->nm_prufn(nm->nm_so, nm->nm_cmd, nm->nm_data,
 463                                 nm->nm_ifp, nm->nm_td);
 464         lwkt_replymsg(&msg->nm_lmsg, error);
 465 }
 466
 467 void
 468 netmsg_pru_detach(netmsg_t msg)
 469 {
 470         struct netmsg_pru_detach *nm = (void *)msg;
 471
 472         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
 473 }
 474
 475 void
 476 netmsg_pru_disconnect(netmsg_t msg)
 477 {
 478         struct netmsg_pru_disconnect *nm = (void *)msg;
 479
 480         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
 481 }
 482
 483 void
 484 netmsg_pru_listen(netmsg_t msg)
 485 {
 486         struct netmsg_pru_listen *nm = (void *)msg;
 487
 488         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_td));
 489 }
 490
 491 void
 492 netmsg_pru_peeraddr(netmsg_t msg)
 493 {
 494         struct netmsg_pru_peeraddr *nm = (void *)msg;
 495
 496         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
 497 }
 498
 499 void
 500 netmsg_pru_rcvd(netmsg_t msg)
 501 {
 502         struct netmsg_pru_rcvd *nm = (void *)msg;
 503
 504         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_flags));
 505 }
 506
 507 void
 508 netmsg_pru_rcvoob(netmsg_t msg)
 509 {
 510         struct netmsg_pru_rcvoob *nm = (void *)msg;
 511
 512         lwkt_replymsg(&msg->nm_lmsg,
 513                       nm->nm_prufn(nm->nm_so, nm->nm_m, nm->nm_flags));
 514 }
 515
 516 void
 517 netmsg_pru_send(netmsg_t msg)
 518 {
 519         struct netmsg_pru_send *nm = (void *)msg;
 520         int error;
 521
 522         error = nm->nm_prufn(nm->nm_so, nm->nm_flags, nm->nm_m,
 523                                 nm->nm_addr, nm->nm_control, nm->nm_td);
 524         lwkt_replymsg(&msg->nm_lmsg, error);
 525 }
 526
 527 void
 528 netmsg_pru_sense(netmsg_t msg)
 529 {
 530         struct netmsg_pru_sense *nm = (void *)msg;
 531
 532         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_stat));
 533 }
 534
 535 void
 536 netmsg_pru_shutdown(netmsg_t msg)
 537 {
 538         struct netmsg_pru_shutdown *nm = (void *)msg;
 539
 540         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
 541 }
 542
 543 void
 544 netmsg_pru_sockaddr(netmsg_t msg)
 545 {
 546         struct netmsg_pru_sockaddr *nm = (void *)msg;
 547
 548         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
 549 }
 550
 551 void
 552 netmsg_pru_sopoll(netmsg_t msg)
 553 {
 554         struct netmsg_pru_sopoll *nm = (void *)msg;
 555         int error;
 556
 557         error = nm->nm_prufn(nm->nm_so, nm->nm_events, nm->nm_cred, nm->nm_td);
 558         lwkt_replymsg(&msg->nm_lmsg, error);
 559 }
 560
 561 void
 562 netmsg_pr_ctloutput(netmsg_t msg)
 563 {
 564         struct netmsg_pr_ctloutput *nm = (void *)msg;
 565
 566         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prfn(nm->nm_so, nm->nm_sopt));
 567 }
 568
 569 void
 570 netmsg_pr_timeout(netmsg_t msg)
 571 {
 572         struct netmsg_pr_timeout *nm = (void *)msg;
 573
 574         lwkt_replymsg(&msg->nm_lmsg, nm->nm_prfn());
 575 }
 576
 577 /*
 578  * Handle a predicate event request.  This function is only called once
 579  * when the predicate message queueing request is received.
 580  */
 581 void
 582 netmsg_so_notify(netmsg_t netmsg)
 583 {
 584         struct netmsg_so_notify *msg = (void *)netmsg;
 585         struct signalsockbuf *ssb;
 586
 587         ssb = (msg->nm_etype & NM_REVENT) ?
 588                         &msg->nm_so->so_rcv :
 589                         &msg->nm_so->so_snd;
 590
 591         /*
 592          * Reply immediately if the event has occured, otherwise queue the
 593          * request.
 594          */
 595         if (msg->nm_predicate(&msg->nm_netmsg)) {
 596                 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg,
 597                               msg->nm_netmsg.nm_lmsg.ms_error);
 598         } else {
 599                 TAILQ_INSERT_TAIL(&ssb->ssb_sel.si_mlist, msg, nm_list);
 600                 ssb->ssb_flags |= SSB_MEVENT;
 601         }
 602 }
 603
 604 /*
 605  * Called by doio when trying to abort a netmsg_so_notify message.
 606  * Unlike the other functions this one is dispatched directly by
 607  * the LWKT subsystem, so it takes a lwkt_msg_t as an argument.
 608  *
 609  * The original message, lmsg, is under the control of the caller and
 610  * will not be destroyed until we return so we can safely reference it
 611  * in our synchronous abort request.
 612  *
 613  * This part of the abort request occurs on the originating cpu which
 614  * means we may race the message flags and the original message may
 615  * not even have been processed by the target cpu yet.
 616  */
 617 void
 618 netmsg_so_notify_doabort(lwkt_msg_t lmsg)
 619 {
 620         struct netmsg_so_notify_abort msg;
 621
 622         if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
 623                 netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
 624                             netmsg_so_notify_abort);
 625                 msg.nm_notifymsg = (void *)lmsg;
 626                 lwkt_domsg(lmsg->ms_target_port, &msg.nm_netmsg.nm_lmsg, 0);
 627         }
 628 }
 629
 630 /*
 631  * Predicate requests can be aborted.  This function is only called once
 632  * and will interlock against processing/reply races (since such races
 633  * occur on the same thread that controls the port where the abort is
 634  * requeued).
 635  *
 636  * This part of the abort request occurs on the target cpu.  The message
 637  * flags must be tested again in case the test that we did on the
 638  * originating cpu raced.  Since messages are handled in sequence, the
 639  * original message will have already been handled by the loop and either
 640  * replied to or queued.
 641  *
 642  * We really only need to interlock with MSGF_REPLY (a bit that is set on
 643  * our cpu when we reply).  Note that MSGF_DONE is not set until the
 644  * reply reaches the originating cpu.  Test both bits anyway.
 645  */
 646 void
 647 netmsg_so_notify_abort(netmsg_t netmsg)
 648 {
 649         struct netmsg_so_notify_abort *abrtmsg = (void *)netmsg;
 650         struct netmsg_so_notify *msg = abrtmsg->nm_notifymsg;
 651         struct signalsockbuf *ssb;
 652
 653         /*
 654          * The original notify message is not destroyed until after the
 655          * abort request is returned, so we can check its state.
 656          */
 657         if ((msg->nm_netmsg.nm_lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
 658                 ssb = (msg->nm_etype & NM_REVENT) ?
 659                                 &msg->nm_so->so_rcv :
 660                                 &msg->nm_so->so_snd;
 661                 TAILQ_REMOVE(&ssb->ssb_sel.si_mlist, msg, nm_list);
 662                 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, EINTR);
 663         }
 664
 665         /*
 666          * Reply to the abort message
 667          */
 668         lwkt_replymsg(&abrtmsg->nm_netmsg.nm_lmsg, 0);
 669 }
 670