uipc_usrreq.c revision 1.2
1 /* 2 * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)uipc_usrreq.c 7.26 (Berkeley) 6/3/91 34 * $Id: uipc_usrreq.c,v 1.2 1993/05/18 18:19:42 cgd Exp $ 35 */ 36 37 #include "param.h" 38 #include "proc.h" 39 #include "filedesc.h" 40 #include "select.h" 41 #include "domain.h" 42 #include "protosw.h" 43 #include "socket.h" 44 #include "socketvar.h" 45 #include "unpcb.h" 46 #include "un.h" 47 #include "namei.h" 48 #include "vnode.h" 49 #include "file.h" 50 #include "stat.h" 51 #include "mbuf.h" 52 53 /* 54 * Unix communications domain. 55 * 56 * TODO: 57 * SEQPACKET, RDM 58 * rethink name space problems 59 * need a proper out-of-band 60 */ 61 struct sockaddr sun_noname = { sizeof(sun_noname), AF_UNIX }; 62 ino_t unp_ino; /* prototype for fake inode numbers */ 63 64 /*ARGSUSED*/ 65 uipc_usrreq(so, req, m, nam, control) 66 struct socket *so; 67 int req; 68 struct mbuf *m, *nam, *control; 69 { 70 struct unpcb *unp = sotounpcb(so); 71 register struct socket *so2; 72 register int error = 0; 73 struct proc *p = curproc; /* XXX */ 74 75 if (req == PRU_CONTROL) 76 return (EOPNOTSUPP); 77 if (req != PRU_SEND && control && control->m_len) { 78 error = EOPNOTSUPP; 79 goto release; 80 } 81 if (unp == 0 && req != PRU_ATTACH) { 82 error = EINVAL; 83 goto release; 84 } 85 switch (req) { 86 87 case PRU_ATTACH: 88 if (unp) { 89 error = EISCONN; 90 break; 91 } 92 error = unp_attach(so); 93 break; 94 95 case PRU_DETACH: 96 unp_detach(unp); 97 break; 98 99 case PRU_BIND: 100 error = unp_bind(unp, nam, p); 101 break; 102 103 case PRU_LISTEN: 104 if (unp->unp_vnode == 0) 105 error = EINVAL; 106 break; 107 108 case PRU_CONNECT: 109 error = unp_connect(so, nam, p); 110 break; 111 112 case PRU_CONNECT2: 113 error = unp_connect2(so, (struct socket *)nam); 114 break; 115 116 case PRU_DISCONNECT: 117 unp_disconnect(unp); 118 break; 119 120 case PRU_ACCEPT: 121 /* 122 * Pass back name of connected socket, 123 * if it was bound and we are still connected 124 * (our peer may have closed already!). 125 */ 126 if (unp->unp_conn && unp->unp_conn->unp_addr) { 127 nam->m_len = unp->unp_conn->unp_addr->m_len; 128 bcopy(mtod(unp->unp_conn->unp_addr, caddr_t), 129 mtod(nam, caddr_t), (unsigned)nam->m_len); 130 } else { 131 nam->m_len = sizeof(sun_noname); 132 *(mtod(nam, struct sockaddr *)) = sun_noname; 133 } 134 break; 135 136 case PRU_SHUTDOWN: 137 socantsendmore(so); 138 unp_shutdown(unp); 139 break; 140 141 case PRU_RCVD: 142 switch (so->so_type) { 143 144 case SOCK_DGRAM: 145 panic("uipc 1"); 146 /*NOTREACHED*/ 147 148 case SOCK_STREAM: 149 #define rcv (&so->so_rcv) 150 #define snd (&so2->so_snd) 151 if (unp->unp_conn == 0) 152 break; 153 so2 = unp->unp_conn->unp_socket; 154 /* 155 * Adjust backpressure on sender 156 * and wakeup any waiting to write. 157 */ 158 snd->sb_mbmax += unp->unp_mbcnt - rcv->sb_mbcnt; 159 unp->unp_mbcnt = rcv->sb_mbcnt; 160 snd->sb_hiwat += unp->unp_cc - rcv->sb_cc; 161 unp->unp_cc = rcv->sb_cc; 162 sowwakeup(so2); 163 #undef snd 164 #undef rcv 165 break; 166 167 default: 168 panic("uipc 2"); 169 } 170 break; 171 172 case PRU_SEND: 173 if (control && (error = unp_internalize(control, p))) 174 break; 175 switch (so->so_type) { 176 177 case SOCK_DGRAM: { 178 struct sockaddr *from; 179 180 if (nam) { 181 if (unp->unp_conn) { 182 error = EISCONN; 183 break; 184 } 185 error = unp_connect(so, nam, p); 186 if (error) 187 break; 188 } else { 189 if (unp->unp_conn == 0) { 190 error = ENOTCONN; 191 break; 192 } 193 } 194 so2 = unp->unp_conn->unp_socket; 195 if (unp->unp_addr) 196 from = mtod(unp->unp_addr, struct sockaddr *); 197 else 198 from = &sun_noname; 199 if (sbappendaddr(&so2->so_rcv, from, m, control)) { 200 sorwakeup(so2); 201 m = 0; 202 control = 0; 203 } else 204 error = ENOBUFS; 205 if (nam) 206 unp_disconnect(unp); 207 break; 208 } 209 210 case SOCK_STREAM: 211 #define rcv (&so2->so_rcv) 212 #define snd (&so->so_snd) 213 if (so->so_state & SS_CANTSENDMORE) { 214 error = EPIPE; 215 break; 216 } 217 if (unp->unp_conn == 0) 218 panic("uipc 3"); 219 so2 = unp->unp_conn->unp_socket; 220 /* 221 * Send to paired receive port, and then reduce 222 * send buffer hiwater marks to maintain backpressure. 223 * Wake up readers. 224 */ 225 if (control) { 226 if (sbappendcontrol(rcv, m, control)) 227 control = 0; 228 } else 229 sbappend(rcv, m); 230 snd->sb_mbmax -= 231 rcv->sb_mbcnt - unp->unp_conn->unp_mbcnt; 232 unp->unp_conn->unp_mbcnt = rcv->sb_mbcnt; 233 snd->sb_hiwat -= rcv->sb_cc - unp->unp_conn->unp_cc; 234 unp->unp_conn->unp_cc = rcv->sb_cc; 235 sorwakeup(so2); 236 m = 0; 237 #undef snd 238 #undef rcv 239 break; 240 241 default: 242 panic("uipc 4"); 243 } 244 break; 245 246 case PRU_ABORT: 247 unp_drop(unp, ECONNABORTED); 248 break; 249 250 case PRU_SENSE: 251 ((struct stat *) m)->st_blksize = so->so_snd.sb_hiwat; 252 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 253 so2 = unp->unp_conn->unp_socket; 254 ((struct stat *) m)->st_blksize += so2->so_rcv.sb_cc; 255 } 256 ((struct stat *) m)->st_dev = NODEV; 257 if (unp->unp_ino == 0) 258 unp->unp_ino = unp_ino++; 259 ((struct stat *) m)->st_ino = unp->unp_ino; 260 return (0); 261 262 case PRU_RCVOOB: 263 return (EOPNOTSUPP); 264 265 case PRU_SENDOOB: 266 error = EOPNOTSUPP; 267 break; 268 269 case PRU_SOCKADDR: 270 if (unp->unp_addr) { 271 nam->m_len = unp->unp_addr->m_len; 272 bcopy(mtod(unp->unp_addr, caddr_t), 273 mtod(nam, caddr_t), (unsigned)nam->m_len); 274 } else 275 nam->m_len = 0; 276 break; 277 278 case PRU_PEERADDR: 279 if (unp->unp_conn && unp->unp_conn->unp_addr) { 280 nam->m_len = unp->unp_conn->unp_addr->m_len; 281 bcopy(mtod(unp->unp_conn->unp_addr, caddr_t), 282 mtod(nam, caddr_t), (unsigned)nam->m_len); 283 } else 284 nam->m_len = 0; 285 break; 286 287 case PRU_SLOWTIMO: 288 break; 289 290 default: 291 panic("piusrreq"); 292 } 293 release: 294 if (control) 295 m_freem(control); 296 if (m) 297 m_freem(m); 298 return (error); 299 } 300 301 /* 302 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 303 * for stream sockets, although the total for sender and receiver is 304 * actually only PIPSIZ. 305 * Datagram sockets really use the sendspace as the maximum datagram size, 306 * and don't really want to reserve the sendspace. Their recvspace should 307 * be large enough for at least one max-size datagram plus address. 308 */ 309 #define PIPSIZ 4096 310 u_long unpst_sendspace = PIPSIZ; 311 u_long unpst_recvspace = PIPSIZ; 312 u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 313 u_long unpdg_recvspace = 4*1024; 314 315 int unp_rights; /* file descriptors in flight */ 316 317 unp_attach(so) 318 struct socket *so; 319 { 320 register struct mbuf *m; 321 register struct unpcb *unp; 322 int error; 323 324 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 325 switch (so->so_type) { 326 327 case SOCK_STREAM: 328 error = soreserve(so, unpst_sendspace, unpst_recvspace); 329 break; 330 331 case SOCK_DGRAM: 332 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 333 break; 334 } 335 if (error) 336 return (error); 337 } 338 m = m_getclr(M_DONTWAIT, MT_PCB); 339 if (m == NULL) 340 return (ENOBUFS); 341 unp = mtod(m, struct unpcb *); 342 so->so_pcb = (caddr_t)unp; 343 unp->unp_socket = so; 344 return (0); 345 } 346 347 unp_detach(unp) 348 register struct unpcb *unp; 349 { 350 351 if (unp->unp_vnode) { 352 unp->unp_vnode->v_socket = 0; 353 vrele(unp->unp_vnode); 354 unp->unp_vnode = 0; 355 } 356 if (unp->unp_conn) 357 unp_disconnect(unp); 358 while (unp->unp_refs) 359 unp_drop(unp->unp_refs, ECONNRESET); 360 soisdisconnected(unp->unp_socket); 361 unp->unp_socket->so_pcb = 0; 362 m_freem(unp->unp_addr); 363 (void) m_free(dtom(unp)); 364 if (unp_rights) 365 unp_gc(); 366 } 367 368 unp_bind(unp, nam, p) 369 struct unpcb *unp; 370 struct mbuf *nam; 371 struct proc *p; 372 { 373 struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 374 register struct vnode *vp; 375 register struct nameidata *ndp; 376 struct vattr vattr; 377 int error; 378 struct nameidata nd; 379 380 ndp = &nd; 381 ndp->ni_dirp = soun->sun_path; 382 if (unp->unp_vnode != NULL) 383 return (EINVAL); 384 if (nam->m_len == MLEN) { 385 if (*(mtod(nam, caddr_t) + nam->m_len - 1) != 0) 386 return (EINVAL); 387 } else 388 *(mtod(nam, caddr_t) + nam->m_len) = 0; 389 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 390 ndp->ni_nameiop = CREATE | FOLLOW | LOCKPARENT; 391 ndp->ni_segflg = UIO_SYSSPACE; 392 if (error = namei(ndp, p)) 393 return (error); 394 vp = ndp->ni_vp; 395 if (vp != NULL) { 396 VOP_ABORTOP(ndp); 397 if (ndp->ni_dvp == vp) 398 vrele(ndp->ni_dvp); 399 else 400 vput(ndp->ni_dvp); 401 vrele(vp); 402 return (EADDRINUSE); 403 } 404 VATTR_NULL(&vattr); 405 vattr.va_type = VSOCK; 406 vattr.va_mode = 0777; 407 if (error = VOP_CREATE(ndp, &vattr, p)) 408 return (error); 409 vp = ndp->ni_vp; 410 vp->v_socket = unp->unp_socket; 411 unp->unp_vnode = vp; 412 unp->unp_addr = m_copy(nam, 0, (int)M_COPYALL); 413 VOP_UNLOCK(vp); 414 return (0); 415 } 416 417 unp_connect(so, nam, p) 418 struct socket *so; 419 struct mbuf *nam; 420 struct proc *p; 421 { 422 register struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 423 register struct vnode *vp; 424 register struct socket *so2, *so3; 425 register struct nameidata *ndp; 426 struct unpcb *unp2, *unp3; 427 int error; 428 struct nameidata nd; 429 430 ndp = &nd; 431 ndp->ni_dirp = soun->sun_path; 432 if (nam->m_data + nam->m_len == &nam->m_dat[MLEN]) { /* XXX */ 433 if (*(mtod(nam, caddr_t) + nam->m_len - 1) != 0) 434 return (EMSGSIZE); 435 } else 436 *(mtod(nam, caddr_t) + nam->m_len) = 0; 437 ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF; 438 ndp->ni_segflg = UIO_SYSSPACE; 439 if (error = namei(ndp, p)) 440 return (error); 441 vp = ndp->ni_vp; 442 if (vp->v_type != VSOCK) { 443 error = ENOTSOCK; 444 goto bad; 445 } 446 if (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) 447 goto bad; 448 so2 = vp->v_socket; 449 if (so2 == 0) { 450 error = ECONNREFUSED; 451 goto bad; 452 } 453 if (so->so_type != so2->so_type) { 454 error = EPROTOTYPE; 455 goto bad; 456 } 457 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 458 if ((so2->so_options & SO_ACCEPTCONN) == 0 || 459 (so3 = sonewconn(so2, 0)) == 0) { 460 error = ECONNREFUSED; 461 goto bad; 462 } 463 unp2 = sotounpcb(so2); 464 unp3 = sotounpcb(so3); 465 if (unp2->unp_addr) 466 unp3->unp_addr = 467 m_copy(unp2->unp_addr, 0, (int)M_COPYALL); 468 so2 = so3; 469 } 470 error = unp_connect2(so, so2); 471 bad: 472 vput(vp); 473 return (error); 474 } 475 476 unp_connect2(so, so2) 477 register struct socket *so; 478 register struct socket *so2; 479 { 480 register struct unpcb *unp = sotounpcb(so); 481 register struct unpcb *unp2; 482 483 if (so2->so_type != so->so_type) 484 return (EPROTOTYPE); 485 unp2 = sotounpcb(so2); 486 unp->unp_conn = unp2; 487 switch (so->so_type) { 488 489 case SOCK_DGRAM: 490 unp->unp_nextref = unp2->unp_refs; 491 unp2->unp_refs = unp; 492 soisconnected(so); 493 break; 494 495 case SOCK_STREAM: 496 unp2->unp_conn = unp; 497 soisconnected(so); 498 soisconnected(so2); 499 break; 500 501 default: 502 panic("unp_connect2"); 503 } 504 return (0); 505 } 506 507 unp_disconnect(unp) 508 struct unpcb *unp; 509 { 510 register struct unpcb *unp2 = unp->unp_conn; 511 512 if (unp2 == 0) 513 return; 514 unp->unp_conn = 0; 515 switch (unp->unp_socket->so_type) { 516 517 case SOCK_DGRAM: 518 if (unp2->unp_refs == unp) 519 unp2->unp_refs = unp->unp_nextref; 520 else { 521 unp2 = unp2->unp_refs; 522 for (;;) { 523 if (unp2 == 0) 524 panic("unp_disconnect"); 525 if (unp2->unp_nextref == unp) 526 break; 527 unp2 = unp2->unp_nextref; 528 } 529 unp2->unp_nextref = unp->unp_nextref; 530 } 531 unp->unp_nextref = 0; 532 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 533 break; 534 535 case SOCK_STREAM: 536 soisdisconnected(unp->unp_socket); 537 unp2->unp_conn = 0; 538 soisdisconnected(unp2->unp_socket); 539 break; 540 } 541 } 542 543 #ifdef notdef 544 unp_abort(unp) 545 struct unpcb *unp; 546 { 547 548 unp_detach(unp); 549 } 550 #endif 551 552 unp_shutdown(unp) 553 struct unpcb *unp; 554 { 555 struct socket *so; 556 557 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn && 558 (so = unp->unp_conn->unp_socket)) 559 socantrcvmore(so); 560 } 561 562 unp_drop(unp, errno) 563 struct unpcb *unp; 564 int errno; 565 { 566 struct socket *so = unp->unp_socket; 567 568 so->so_error = errno; 569 unp_disconnect(unp); 570 if (so->so_head) { 571 so->so_pcb = (caddr_t) 0; 572 m_freem(unp->unp_addr); 573 (void) m_free(dtom(unp)); 574 sofree(so); 575 } 576 } 577 578 #ifdef notdef 579 unp_drain() 580 { 581 582 } 583 #endif 584 585 unp_externalize(rights) 586 struct mbuf *rights; 587 { 588 struct proc *p = curproc; /* XXX */ 589 register int i; 590 register struct cmsghdr *cm = mtod(rights, struct cmsghdr *); 591 register struct file **rp = (struct file **)(cm + 1); 592 register struct file *fp; 593 int newfds = (cm->cmsg_len - sizeof(*cm)) / sizeof (int); 594 int f; 595 596 if (fdavail(p, newfds)) { 597 for (i = 0; i < newfds; i++) { 598 fp = *rp; 599 unp_discard(fp); 600 *rp++ = 0; 601 } 602 return (EMSGSIZE); 603 } 604 for (i = 0; i < newfds; i++) { 605 if (fdalloc(p, 0, &f)) 606 panic("unp_externalize"); 607 fp = *rp; 608 p->p_fd->fd_ofiles[f] = fp; 609 fp->f_msgcount--; 610 unp_rights--; 611 *(int *)rp++ = f; 612 } 613 return (0); 614 } 615 616 unp_internalize(control, p) 617 struct mbuf *control; 618 struct proc *p; 619 { 620 struct filedesc *fdp = p->p_fd; 621 register struct cmsghdr *cm = mtod(control, struct cmsghdr *); 622 register struct file **rp; 623 register struct file *fp; 624 register int i, fd; 625 int oldfds; 626 627 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 628 cm->cmsg_len != control->m_len) 629 return (EINVAL); 630 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int); 631 rp = (struct file **)(cm + 1); 632 for (i = 0; i < oldfds; i++) { 633 fd = *(int *)rp++; 634 if ((unsigned)fd >= fdp->fd_nfiles || 635 fdp->fd_ofiles[fd] == NULL) 636 return (EBADF); 637 } 638 rp = (struct file **)(cm + 1); 639 for (i = 0; i < oldfds; i++) { 640 fp = fdp->fd_ofiles[*(int *)rp]; 641 *rp++ = fp; 642 fp->f_count++; 643 fp->f_msgcount++; 644 unp_rights++; 645 } 646 return (0); 647 } 648 649 int unp_defer, unp_gcing; 650 int unp_mark(); 651 extern struct domain unixdomain; 652 653 unp_gc() 654 { 655 register struct file *fp; 656 register struct socket *so; 657 658 if (unp_gcing) 659 return; 660 unp_gcing = 1; 661 restart: 662 unp_defer = 0; 663 for (fp = filehead; fp; fp = fp->f_filef) 664 fp->f_flag &= ~(FMARK|FDEFER); 665 do { 666 for (fp = filehead; fp; fp = fp->f_filef) { 667 if (fp->f_count == 0) 668 continue; 669 if (fp->f_flag & FDEFER) { 670 fp->f_flag &= ~FDEFER; 671 unp_defer--; 672 } else { 673 if (fp->f_flag & FMARK) 674 continue; 675 if (fp->f_count == fp->f_msgcount) 676 continue; 677 fp->f_flag |= FMARK; 678 } 679 if (fp->f_type != DTYPE_SOCKET || 680 (so = (struct socket *)fp->f_data) == 0) 681 continue; 682 if (so->so_proto->pr_domain != &unixdomain || 683 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 684 continue; 685 #ifdef notdef 686 if (so->so_rcv.sb_flags & SB_LOCK) { 687 /* 688 * This is problematical; it's not clear 689 * we need to wait for the sockbuf to be 690 * unlocked (on a uniprocessor, at least), 691 * and it's also not clear what to do 692 * if sbwait returns an error due to receipt 693 * of a signal. If sbwait does return 694 * an error, we'll go into an infinite 695 * loop. Delete all of this for now. 696 */ 697 (void) sbwait(&so->so_rcv); 698 goto restart; 699 } 700 #endif 701 unp_scan(so->so_rcv.sb_mb, unp_mark); 702 } 703 } while (unp_defer); 704 for (fp = filehead; fp; fp = fp->f_filef) { 705 if (fp->f_count == 0) 706 continue; 707 if (fp->f_count == fp->f_msgcount && (fp->f_flag & FMARK) == 0) 708 while (fp->f_msgcount) 709 unp_discard(fp); 710 } 711 unp_gcing = 0; 712 } 713 714 unp_dispose(m) 715 struct mbuf *m; 716 { 717 int unp_discard(); 718 719 if (m) 720 unp_scan(m, unp_discard); 721 } 722 723 unp_scan(m0, op) 724 register struct mbuf *m0; 725 int (*op)(); 726 { 727 register struct mbuf *m; 728 register struct file **rp; 729 register struct cmsghdr *cm; 730 register int i; 731 int qfds; 732 733 while (m0) { 734 for (m = m0; m; m = m->m_next) 735 if (m->m_type == MT_CONTROL && 736 m->m_len >= sizeof(*cm)) { 737 cm = mtod(m, struct cmsghdr *); 738 if (cm->cmsg_level != SOL_SOCKET || 739 cm->cmsg_type != SCM_RIGHTS) 740 continue; 741 qfds = (cm->cmsg_len - sizeof *cm) 742 / sizeof (struct file *); 743 rp = (struct file **)(cm + 1); 744 for (i = 0; i < qfds; i++) 745 (*op)(*rp++); 746 break; /* XXX, but saves time */ 747 } 748 m0 = m0->m_act; 749 } 750 } 751 752 unp_mark(fp) 753 struct file *fp; 754 { 755 756 if (fp->f_flag & FMARK) 757 return; 758 unp_defer++; 759 fp->f_flag |= (FMARK|FDEFER); 760 } 761 762 unp_discard(fp) 763 struct file *fp; 764 { 765 766 fp->f_msgcount--; 767 unp_rights--; 768 (void) closef(fp, curproc); 769 } 770
Indexes created Sun Sep 21 20:09:37 GMT 2025