1 /* 2 * Copyright (c) 1982 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)uipc_socket.c 6.19 (Berkeley) 12/19/85 7 */ 8 9 #include "param.h" 10 #include "systm.h" 11 #include "dir.h" 12 #include "user.h" 13 #include "proc.h" 14 #include "file.h" 15 #include "inode.h" 16 #include "buf.h" 17 #include "mbuf.h" 18 #include "un.h" 19 #include "domain.h" 20 #include "protosw.h" 21 #include "socket.h" 22 #include "socketvar.h" 23 #include "stat.h" 24 #include "ioctl.h" 25 #include "uio.h" 26 #include "../net/route.h" 27 #include "../netinet/in.h" 28 #include "../net/if.h" 29 30 /* 31 * Socket operation routines. 32 * These routines are called by the routines in 33 * sys_socket.c or from a system process, and 34 * implement the semantics of socket operations by 35 * switching out to the protocol specific routines. 36 * 37 * TODO: 38 * test socketpair 39 * clean up async 40 * out-of-band is a kludge 41 */ 42 /*ARGSUSED*/ 43 socreate(dom, aso, type, proto) 44 struct socket **aso; 45 register int type; 46 int proto; 47 { 48 register struct protosw *prp; 49 register struct socket *so; 50 register struct mbuf *m; 51 register int error; 52 53 if (proto) 54 prp = pffindproto(dom, proto, type); 55 else 56 prp = pffindtype(dom, type); 57 if (prp == 0) 58 return (EPROTONOSUPPORT); 59 if (prp->pr_type != type) 60 return (EPROTOTYPE); 61 m = m_getclr(M_WAIT, MT_SOCKET); 62 so = mtod(m, struct socket *); 63 so->so_options = 0; 64 so->so_state = 0; 65 so->so_type = type; 66 if (u.u_uid == 0) 67 so->so_state = SS_PRIV; 68 so->so_proto = prp; 69 error = 70 (*prp->pr_usrreq)(so, PRU_ATTACH, 71 (struct mbuf *)0, (struct mbuf *)proto, (struct mbuf *)0); 72 if (error) { 73 so->so_state |= SS_NOFDREF; 74 sofree(so); 75 return (error); 76 } 77 *aso = so; 78 return (0); 79 } 80 81 sobind(so, nam) 82 struct socket *so; 83 struct mbuf *nam; 84 { 85 int s = splnet(); 86 int error; 87 88 error = 89 (*so->so_proto->pr_usrreq)(so, PRU_BIND, 90 (struct mbuf *)0, nam, (struct mbuf *)0); 91 splx(s); 92 return (error); 93 } 94 95 solisten(so, backlog) 96 register struct socket *so; 97 int backlog; 98 { 99 int s = splnet(), error; 100 101 error = 102 (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, 103 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 104 if (error) { 105 splx(s); 106 return (error); 107 } 108 if (so->so_q == 0) { 109 so->so_q = so; 110 so->so_q0 = so; 111 so->so_options |= SO_ACCEPTCONN; 112 } 113 if (backlog < 0) 114 backlog = 0; 115 so->so_qlimit = MIN(backlog, SOMAXCONN); 116 splx(s); 117 return (0); 118 } 119 120 sofree(so) 121 register struct socket *so; 122 { 123 124 if (so->so_head) { 125 if (!soqremque(so, 0) && !soqremque(so, 1)) 126 panic("sofree dq"); 127 so->so_head = 0; 128 } 129 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 130 return; 131 sbrelease(&so->so_snd); 132 sorflush(so); 133 (void) m_free(dtom(so)); 134 } 135 136 /* 137 * Close a socket on last file table reference removal. 138 * Initiate disconnect if connected. 139 * Free socket when disconnect complete. 140 */ 141 soclose(so) 142 register struct socket *so; 143 { 144 int s = splnet(); /* conservative */ 145 int error; 146 147 if (so->so_options & SO_ACCEPTCONN) { 148 while (so->so_q0 != so) 149 (void) soabort(so->so_q0); 150 while (so->so_q != so) 151 (void) soabort(so->so_q); 152 } 153 if (so->so_pcb == 0) 154 goto discard; 155 if (so->so_state & SS_ISCONNECTED) { 156 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 157 error = sodisconnect(so, (struct mbuf *)0); 158 if (error) 159 goto drop; 160 } 161 if (so->so_options & SO_LINGER) { 162 if ((so->so_state & SS_ISDISCONNECTING) && 163 (so->so_state & SS_NBIO)) 164 goto drop; 165 while (so->so_state & SS_ISCONNECTED) 166 sleep((caddr_t)&so->so_timeo, PZERO+1); 167 } 168 } 169 drop: 170 if (so->so_pcb) { 171 int error2 = 172 (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 173 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 174 if (error == 0) 175 error = error2; 176 } 177 discard: 178 if (so->so_state & SS_NOFDREF) 179 panic("soclose: NOFDREF"); 180 so->so_state |= SS_NOFDREF; 181 sofree(so); 182 splx(s); 183 return (error); 184 } 185 186 /* 187 * Must be called at splnet... 188 */ 189 soabort(so) 190 struct socket *so; 191 { 192 193 return ( 194 (*so->so_proto->pr_usrreq)(so, PRU_ABORT, 195 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 196 } 197 198 soaccept(so, nam) 199 register struct socket *so; 200 struct mbuf *nam; 201 { 202 int s = splnet(); 203 int error; 204 205 if ((so->so_state & SS_NOFDREF) == 0) 206 panic("soaccept: !NOFDREF"); 207 so->so_state &= ~SS_NOFDREF; 208 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 209 (struct mbuf *)0, nam, (struct mbuf *)0); 210 splx(s); 211 return (error); 212 } 213 214 soconnect(so, nam) 215 register struct socket *so; 216 struct mbuf *nam; 217 { 218 int s = splnet(); 219 int error; 220 221 /* 222 * If protocol is connection-based, can only connect once. 223 * Otherwise, if connected, try to disconnect first. 224 * This allows user to disconnect by connecting to, e.g., 225 * a null address. 226 */ 227 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 228 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 229 (error = sodisconnect(so)))) 230 error = EISCONN; 231 else 232 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 233 (struct mbuf *)0, nam, (struct mbuf *)0); 234 splx(s); 235 return (error); 236 } 237 238 soconnect2(so1, so2) 239 register struct socket *so1; 240 struct socket *so2; 241 { 242 int s = splnet(); 243 int error; 244 245 error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, 246 (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0); 247 splx(s); 248 return (error); 249 } 250 251 sodisconnect(so, nam) 252 register struct socket *so; 253 struct mbuf *nam; 254 { 255 int s = splnet(); 256 int error; 257 258 if ((so->so_state & SS_ISCONNECTED) == 0) { 259 error = ENOTCONN; 260 goto bad; 261 } 262 if (so->so_state & SS_ISDISCONNECTING) { 263 error = EALREADY; 264 goto bad; 265 } 266 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 267 (struct mbuf *)0, nam, (struct mbuf *)0); 268 bad: 269 splx(s); 270 return (error); 271 } 272 273 /* 274 * Send on a socket. 275 * If send must go all at once and message is larger than 276 * send buffering, then hard error. 277 * Lock against other senders. 278 * If must go all at once and not enough room now, then 279 * inform user that this would block and do nothing. 280 * Otherwise, if nonblocking, send as much as possible. 281 */ 282 sosend(so, nam, uio, flags, rights) 283 register struct socket *so; 284 struct mbuf *nam; 285 register struct uio *uio; 286 int flags; 287 struct mbuf *rights; 288 { 289 struct mbuf *top = 0; 290 register struct mbuf *m, **mp; 291 register int space; 292 int len, rlen = 0, error = 0, s, dontroute, first = 1; 293 294 if (sosendallatonce(so) && uio->uio_resid > so->so_snd.sb_hiwat) 295 return (EMSGSIZE); 296 dontroute = 297 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 298 (so->so_proto->pr_flags & PR_ATOMIC); 299 u.u_ru.ru_msgsnd++; 300 if (rights) 301 rlen = rights->m_len; 302 #define snderr(errno) { error = errno; splx(s); goto release; } 303 304 restart: 305 sblock(&so->so_snd); 306 do { 307 s = splnet(); 308 if (so->so_state & SS_CANTSENDMORE) 309 snderr(EPIPE); 310 if (so->so_error) { 311 error = so->so_error; 312 so->so_error = 0; /* ??? */ 313 splx(s); 314 goto release; 315 } 316 if ((so->so_state & SS_ISCONNECTED) == 0) { 317 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 318 snderr(ENOTCONN); 319 if (nam == 0) 320 snderr(EDESTADDRREQ); 321 } 322 if (flags & MSG_OOB) 323 space = 1024; 324 else { 325 space = sbspace(&so->so_snd); 326 if (space <= rlen || 327 (sosendallatonce(so) && 328 space < uio->uio_resid + rlen) || 329 (uio->uio_resid >= CLBYTES && space < CLBYTES && 330 so->so_snd.sb_cc >= CLBYTES && 331 (so->so_state & SS_NBIO) == 0)) { 332 if (so->so_state & SS_NBIO) { 333 if (first) 334 error = EWOULDBLOCK; 335 splx(s); 336 goto release; 337 } 338 sbunlock(&so->so_snd); 339 sbwait(&so->so_snd); 340 splx(s); 341 goto restart; 342 } 343 } 344 splx(s); 345 mp = ⊤ 346 space -= rlen; 347 while (space > 0) { 348 register struct iovec *iov = uio->uio_iov; 349 350 MGET(m, M_WAIT, MT_DATA); 351 if (iov->iov_len >= NBPG && space >= CLBYTES) { 352 register struct mbuf *p; 353 MCLGET(p, 1); 354 if (p == 0) 355 goto nopages; 356 m->m_off = (int)p - (int)m; 357 len = MIN(CLBYTES, iov->iov_len); 358 space -= CLBYTES; 359 } else { 360 nopages: 361 len = MIN(MIN(MLEN, iov->iov_len), space); 362 space -= len; 363 } 364 error = uiomove(mtod(m, caddr_t), len, UIO_WRITE, uio); 365 m->m_len = len; 366 *mp = m; 367 if (error) 368 goto release; 369 mp = &m->m_next; 370 if (uio->uio_resid <= 0) 371 break; 372 while (uio->uio_iov->iov_len == 0) { 373 uio->uio_iov++; 374 uio->uio_iovcnt--; 375 if (uio->uio_iovcnt <= 0) 376 panic("sosend"); 377 } 378 } 379 if (dontroute) 380 so->so_options |= SO_DONTROUTE; 381 s = splnet(); /* XXX */ 382 error = (*so->so_proto->pr_usrreq)(so, 383 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 384 top, (caddr_t)nam, rights); 385 splx(s); 386 if (dontroute) 387 so->so_options &= ~SO_DONTROUTE; 388 rights = 0; 389 rlen = 0; 390 top = 0; 391 first = 0; 392 if (error) 393 break; 394 } while (uio->uio_resid); 395 396 release: 397 sbunlock(&so->so_snd); 398 if (top) 399 m_freem(top); 400 if (error == EPIPE) 401 psignal(u.u_procp, SIGPIPE); 402 return (error); 403 } 404 405 /* 406 * Implement receive operations on a socket. 407 * We depend on the way that records are added to the sockbuf 408 * by sbappend*. In particular, each record (mbufs linked through m_next) 409 * must begin with an address if the protocol so specifies, 410 * followed by an optional mbuf containing access rights if supported 411 * by the protocol, and then zero or more mbufs of data. 412 * In order to avoid blocking network interrupts for the entire time here, 413 * we splx() while doing the actual copy to user space. 414 * Although the sockbuf is locked, new data may still be appended, 415 * and thus we must maintain consistency of the sockbuf during that time. 416 */ 417 soreceive(so, aname, uio, flags, rightsp) 418 register struct socket *so; 419 struct mbuf **aname; 420 register struct uio *uio; 421 int flags; 422 struct mbuf **rightsp; 423 { 424 register struct mbuf *m, *n; 425 register int len, error = 0, s, tomark; 426 struct protosw *pr = so->so_proto; 427 struct mbuf *nextrecord; 428 int moff; 429 430 if (rightsp) 431 *rightsp = 0; 432 if (aname) 433 *aname = 0; 434 if (flags & MSG_OOB) { 435 m = m_get(M_WAIT, MT_DATA); 436 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, 437 m, (struct mbuf *)(flags & MSG_PEEK), (struct mbuf *)0); 438 if (error) 439 goto bad; 440 do { 441 len = uio->uio_resid; 442 if (len > m->m_len) 443 len = m->m_len; 444 error = 445 uiomove(mtod(m, caddr_t), (int)len, UIO_READ, uio); 446 m = m_free(m); 447 } while (uio->uio_resid && error == 0 && m); 448 bad: 449 if (m) 450 m_freem(m); 451 return (error); 452 } 453 454 restart: 455 sblock(&so->so_rcv); 456 s = splnet(); 457 458 #define rcverr(errno) { error = errno; splx(s); goto release; } 459 if (so->so_rcv.sb_cc == 0) { 460 if (so->so_error) { 461 error = so->so_error; 462 so->so_error = 0; 463 splx(s); 464 goto release; 465 } 466 if (so->so_state & SS_CANTRCVMORE) { 467 splx(s); 468 goto release; 469 } 470 if ((so->so_state & SS_ISCONNECTED) == 0 && 471 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 472 rcverr(ENOTCONN); 473 if (uio->uio_resid == 0) 474 goto release; 475 if (so->so_state & SS_NBIO) 476 rcverr(EWOULDBLOCK); 477 sbunlock(&so->so_rcv); 478 sbwait(&so->so_rcv); 479 splx(s); 480 goto restart; 481 } 482 u.u_ru.ru_msgrcv++; 483 m = so->so_rcv.sb_mb; 484 if (m == 0) 485 panic("receive 1"); 486 nextrecord = m->m_act; 487 if (pr->pr_flags & PR_ADDR) { 488 if (m->m_type != MT_SONAME) 489 panic("receive 1a"); 490 if (flags & MSG_PEEK) { 491 if (aname) 492 *aname = m_copy(m, 0, m->m_len); 493 m = m->m_next; 494 } else { 495 sbfree(&so->so_rcv, m); 496 if (aname) { 497 *aname = m; 498 m = m->m_next; 499 (*aname)->m_next = 0; 500 } else { 501 MFREE(m, n); 502 nextrecord = m->m_act; 503 m = n; 504 } 505 } 506 } 507 if (m && m->m_type == MT_RIGHTS) { 508 if ((pr->pr_flags & PR_RIGHTS) == 0) 509 panic("receive 2a"); 510 if (flags & MSG_PEEK) { 511 if (rightsp) 512 *rightsp = m_copy(m, 0, m->m_len); 513 m = m->m_next; 514 } else { 515 sbfree(&so->so_rcv, m); 516 if (rightsp) { 517 *rightsp = m; 518 n = m->m_next; 519 m->m_next = 0; 520 m = n; 521 } else { 522 MFREE(m, n); 523 m = n; 524 } 525 } 526 } 527 moff = 0; 528 tomark = so->so_oobmark; 529 while (m && uio->uio_resid > 0 && error == 0) { 530 if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 531 panic("receive 3"); 532 len = uio->uio_resid; 533 so->so_state &= ~SS_RCVATMARK; 534 if (tomark && len > tomark) 535 len = tomark; 536 if (len > m->m_len - moff) 537 len = m->m_len - moff; 538 so->so_rcv.sb_mb = m; 539 m->m_act = nextrecord; 540 splx(s); 541 error = 542 uiomove(mtod(m, caddr_t) + moff, (int)len, UIO_READ, uio); 543 s = splnet(); 544 if (len == m->m_len - moff) { 545 if (flags & MSG_PEEK) { 546 m = m->m_next; 547 moff = 0; 548 } else { 549 sbfree(&so->so_rcv, m); 550 nextrecord = m->m_act; 551 MFREE(m, n); 552 so->so_rcv.sb_mb = m = n; 553 } 554 } else { 555 if (flags & MSG_PEEK) 556 moff += len; 557 else { 558 m->m_off += len; 559 m->m_len -= len; 560 so->so_rcv.sb_cc -= len; 561 } 562 } 563 if ((flags & MSG_PEEK) == 0 && so->so_oobmark) { 564 so->so_oobmark -= len; 565 if (so->so_oobmark == 0) { 566 so->so_state |= SS_RCVATMARK; 567 break; 568 } 569 } 570 if (tomark) { 571 tomark -= len; 572 if (tomark == 0) 573 break; 574 } 575 } 576 if ((flags & MSG_PEEK) == 0) { 577 if (so->so_rcv.sb_mb == 0) 578 so->so_rcv.sb_mb = nextrecord; 579 else if (pr->pr_flags & PR_ATOMIC) 580 (void) sbdroprecord(&so->so_rcv); 581 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 582 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 583 (struct mbuf *)0, (struct mbuf *)0); 584 if (error == 0 && rightsp && *rightsp && 585 pr->pr_domain->dom_externalize) 586 error = (*pr->pr_domain->dom_externalize)(*rightsp); 587 } 588 release: 589 sbunlock(&so->so_rcv); 590 splx(s); 591 return (error); 592 } 593 594 soshutdown(so, how) 595 register struct socket *so; 596 register int how; 597 { 598 register struct protosw *pr = so->so_proto; 599 600 how++; 601 if (how & FREAD) 602 sorflush(so); 603 if (how & FWRITE) 604 return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN, 605 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 606 return (0); 607 } 608 609 sorflush(so) 610 register struct socket *so; 611 { 612 register struct sockbuf *sb = &so->so_rcv; 613 register struct protosw *pr = so->so_proto; 614 register int s; 615 struct sockbuf asb; 616 617 sblock(sb); 618 s = splimp(); 619 socantrcvmore(so); 620 sbunlock(sb); 621 asb = *sb; 622 bzero((caddr_t)sb, sizeof (*sb)); 623 splx(s); 624 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 625 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 626 sbrelease(&asb); 627 } 628 629 sosetopt(so, level, optname, m0) 630 register struct socket *so; 631 int level, optname; 632 struct mbuf *m0; 633 { 634 int error = 0; 635 register struct mbuf *m = m0; 636 637 if (level != SOL_SOCKET) { 638 if (so->so_proto && so->so_proto->pr_ctloutput) 639 return ((*so->so_proto->pr_ctloutput) 640 (PRCO_SETOPT, so, level, optname, &m0)); 641 error = ENOPROTOOPT; 642 } else { 643 switch (optname) { 644 645 case SO_LINGER: 646 if (m == NULL || m->m_len != sizeof (struct linger)) { 647 error = EINVAL; 648 goto bad; 649 } 650 so->so_linger = mtod(m, struct linger *)->l_linger; 651 /* fall thru... */ 652 653 case SO_DEBUG: 654 case SO_KEEPALIVE: 655 case SO_DONTROUTE: 656 case SO_USELOOPBACK: 657 case SO_BROADCAST: 658 case SO_REUSEADDR: 659 if (m == NULL || m->m_len < sizeof (int)) { 660 error = EINVAL; 661 goto bad; 662 } 663 if (*mtod(m, int *)) 664 so->so_options |= optname; 665 else 666 so->so_options &= ~optname; 667 break; 668 669 case SO_SNDBUF: 670 case SO_RCVBUF: 671 case SO_SNDLOWAT: 672 case SO_RCVLOWAT: 673 case SO_SNDTIMEO: 674 case SO_RCVTIMEO: 675 if (m == NULL || m->m_len < sizeof (int)) { 676 error = EINVAL; 677 goto bad; 678 } 679 switch (optname) { 680 681 case SO_SNDBUF: 682 case SO_RCVBUF: 683 if (sbreserve(optname == SO_SNDBUF ? &so->so_snd : 684 &so->so_rcv, *mtod(m, int *)) == 0) { 685 error = ENOBUFS; 686 goto bad; 687 } 688 break; 689 690 case SO_SNDLOWAT: 691 so->so_snd.sb_lowat = *mtod(m, int *); 692 break; 693 case SO_RCVLOWAT: 694 so->so_rcv.sb_lowat = *mtod(m, int *); 695 break; 696 case SO_SNDTIMEO: 697 so->so_snd.sb_timeo = *mtod(m, int *); 698 break; 699 case SO_RCVTIMEO: 700 so->so_rcv.sb_timeo = *mtod(m, int *); 701 break; 702 } 703 break; 704 705 default: 706 error = ENOPROTOOPT; 707 break; 708 } 709 } 710 bad: 711 if (m) 712 (void) m_free(m); 713 return (error); 714 } 715 716 sogetopt(so, level, optname, mp) 717 register struct socket *so; 718 int level, optname; 719 struct mbuf **mp; 720 { 721 register struct mbuf *m; 722 723 if (level != SOL_SOCKET) { 724 if (so->so_proto && so->so_proto->pr_ctloutput) { 725 return ((*so->so_proto->pr_ctloutput) 726 (PRCO_GETOPT, so, level, optname, mp)); 727 } else 728 return (ENOPROTOOPT); 729 } else { 730 m = m_get(M_WAIT, MT_SOOPTS); 731 m->m_len = sizeof (int); 732 733 switch (optname) { 734 735 case SO_LINGER: 736 m->m_len = sizeof (struct linger); 737 mtod(m, struct linger *)->l_onoff = 738 so->so_options & SO_LINGER; 739 mtod(m, struct linger *)->l_linger = so->so_linger; 740 break; 741 742 case SO_USELOOPBACK: 743 case SO_DONTROUTE: 744 case SO_DEBUG: 745 case SO_KEEPALIVE: 746 case SO_REUSEADDR: 747 case SO_BROADCAST: 748 *mtod(m, int *) = so->so_options & optname; 749 break; 750 751 case SO_TYPE: 752 *mtod(m, int *) = so->so_type; 753 break; 754 755 case SO_ERROR: 756 *mtod(m, int *) = so->so_error; 757 so->so_error = 0; 758 break; 759 760 case SO_SNDBUF: 761 *mtod(m, int *) = so->so_snd.sb_hiwat; 762 break; 763 764 case SO_RCVBUF: 765 *mtod(m, int *) = so->so_rcv.sb_hiwat; 766 break; 767 768 case SO_SNDLOWAT: 769 *mtod(m, int *) = so->so_snd.sb_lowat; 770 break; 771 772 case SO_RCVLOWAT: 773 *mtod(m, int *) = so->so_rcv.sb_lowat; 774 break; 775 776 case SO_SNDTIMEO: 777 *mtod(m, int *) = so->so_snd.sb_timeo; 778 break; 779 780 case SO_RCVTIMEO: 781 *mtod(m, int *) = so->so_rcv.sb_timeo; 782 break; 783 784 default: 785 m_free(m); 786 return (ENOPROTOOPT); 787 } 788 *mp = m; 789 return (0); 790 } 791 } 792 793 sohasoutofband(so) 794 register struct socket *so; 795 { 796 struct proc *p; 797 798 if (so->so_pgrp < 0) 799 gsignal(-so->so_pgrp, SIGURG); 800 else if (so->so_pgrp > 0 && (p = pfind(so->so_pgrp)) != 0) 801 psignal(p, SIGURG); 802 if (so->so_rcv.sb_sel) { 803 selwakeup(so->so_rcv.sb_sel, so->so_rcv.sb_flags & SB_COLL); 804 so->so_rcv.sb_sel = 0; 805 so->so_rcv.sb_flags &= ~SB_COLL; 806 } 807 } 808