uipc_usrreq.c revision 1.1
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 * @(#)uipc_usrreq.c 7.26 (Berkeley) 6/3/91 34 */ 35 36 #include "param.h" 37 #include "proc.h" 38 #include "filedesc.h" 39 #include "domain.h" 40 #include "protosw.h" 41 #include "socket.h" 42 #include "socketvar.h" 43 #include "unpcb.h" 44 #include "un.h" 45 #include "namei.h" 46 #include "vnode.h" 47 #include "file.h" 48 #include "stat.h" 49 #include "mbuf.h" 50 51 /* 52 * Unix communications domain. 53 * 54 * TODO: 55 * SEQPACKET, RDM 56 * rethink name space problems 57 * need a proper out-of-band 58 */ 59 struct sockaddr sun_noname = { sizeof(sun_noname), AF_UNIX }; 60 ino_t unp_ino; /* prototype for fake inode numbers */ 61 62 /*ARGSUSED*/ 63 uipc_usrreq(so, req, m, nam, control) 64 struct socket *so; 65 int req; 66 struct mbuf *m, *nam, *control; 67 { 68 struct unpcb *unp = sotounpcb(so); 69 register struct socket *so2; 70 register int error = 0; 71 struct proc *p = curproc; /* XXX */ 72 73 if (req == PRU_CONTROL) 74 return (EOPNOTSUPP); 75 if (req != PRU_SEND && control && control->m_len) { 76 error = EOPNOTSUPP; 77 goto release; 78 } 79 if (unp == 0 && req != PRU_ATTACH) { 80 error = EINVAL; 81 goto release; 82 } 83 switch (req) { 84 85 case PRU_ATTACH: 86 if (unp) { 87 error = EISCONN; 88 break; 89 } 90 error = unp_attach(so); 91 break; 92 93 case PRU_DETACH: 94 unp_detach(unp); 95 break; 96 97 case PRU_BIND: 98 error = unp_bind(unp, nam, p); 99 break; 100 101 case PRU_LISTEN: 102 if (unp->unp_vnode == 0) 103 error = EINVAL; 104 break; 105 106 case PRU_CONNECT: 107 error = unp_connect(so, nam, p); 108 break; 109 110 case PRU_CONNECT2: 111 error = unp_connect2(so, (struct socket *)nam); 112 break; 113 114 case PRU_DISCONNECT: 115 unp_disconnect(unp); 116 break; 117 118 case PRU_ACCEPT: 119 /* 120 * Pass back name of connected socket, 121 * if it was bound and we are still connected 122 * (our peer may have closed already!). 123 */ 124 if (unp->unp_conn && unp->unp_conn->unp_addr) { 125 nam->m_len = unp->unp_conn->unp_addr->m_len; 126 bcopy(mtod(unp->unp_conn->unp_addr, caddr_t), 127 mtod(nam, caddr_t), (unsigned)nam->m_len); 128 } else { 129 nam->m_len = sizeof(sun_noname); 130 *(mtod(nam, struct sockaddr *)) = sun_noname; 131 } 132 break; 133 134 case PRU_SHUTDOWN: 135 socantsendmore(so); 136 unp_shutdown(unp); 137 break; 138 139 case PRU_RCVD: 140 switch (so->so_type) { 141 142 case SOCK_DGRAM: 143 panic("uipc 1"); 144 /*NOTREACHED*/ 145 146 case SOCK_STREAM: 147 #define rcv (&so->so_rcv) 148 #define snd (&so2->so_snd) 149 if (unp->unp_conn == 0) 150 break; 151 so2 = unp->unp_conn->unp_socket; 152 /* 153 * Adjust backpressure on sender 154 * and wakeup any waiting to write. 155 */ 156 snd->sb_mbmax += unp->unp_mbcnt - rcv->sb_mbcnt; 157 unp->unp_mbcnt = rcv->sb_mbcnt; 158 snd->sb_hiwat += unp->unp_cc - rcv->sb_cc; 159 unp->unp_cc = rcv->sb_cc; 160 sowwakeup(so2); 161 #undef snd 162 #undef rcv 163 break; 164 165 default: 166 panic("uipc 2"); 167 } 168 break; 169 170 case PRU_SEND: 171 if (control && (error = unp_internalize(control, p))) 172 break; 173 switch (so->so_type) { 174 175 case SOCK_DGRAM: { 176 struct sockaddr *from; 177 178 if (nam) { 179 if (unp->unp_conn) { 180 error = EISCONN; 181 break; 182 } 183 error = unp_connect(so, nam, p); 184 if (error) 185 break; 186 } else { 187 if (unp->unp_conn == 0) { 188 error = ENOTCONN; 189 break; 190 } 191 } 192 so2 = unp->unp_conn->unp_socket; 193 if (unp->unp_addr) 194 from = mtod(unp->unp_addr, struct sockaddr *); 195 else 196 from = &sun_noname; 197 if (sbappendaddr(&so2->so_rcv, from, m, control)) { 198 sorwakeup(so2); 199 m = 0; 200 control = 0; 201 } else 202 error = ENOBUFS; 203 if (nam) 204 unp_disconnect(unp); 205 break; 206 } 207 208 case SOCK_STREAM: 209 #define rcv (&so2->so_rcv) 210 #define snd (&so->so_snd) 211 if (so->so_state & SS_CANTSENDMORE) { 212 error = EPIPE; 213 break; 214 } 215 if (unp->unp_conn == 0) 216 panic("uipc 3"); 217 so2 = unp->unp_conn->unp_socket; 218 /* 219 * Send to paired receive port, and then reduce 220 * send buffer hiwater marks to maintain backpressure. 221 * Wake up readers. 222 */ 223 if (control) { 224 if (sbappendcontrol(rcv, m, control)) 225 control = 0; 226 } else 227 sbappend(rcv, m); 228 snd->sb_mbmax -= 229 rcv->sb_mbcnt - unp->unp_conn->unp_mbcnt; 230 unp->unp_conn->unp_mbcnt = rcv->sb_mbcnt; 231 snd->sb_hiwat -= rcv->sb_cc - unp->unp_conn->unp_cc; 232 unp->unp_conn->unp_cc = rcv->sb_cc; 233 sorwakeup(so2); 234 m = 0; 235 #undef snd 236 #undef rcv 237 break; 238 239 default: 240 panic("uipc 4"); 241 } 242 break; 243 244 case PRU_ABORT: 245 unp_drop(unp, ECONNABORTED); 246 break; 247 248 case PRU_SENSE: 249 ((struct stat *) m)->st_blksize = so->so_snd.sb_hiwat; 250 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { 251 so2 = unp->unp_conn->unp_socket; 252 ((struct stat *) m)->st_blksize += so2->so_rcv.sb_cc; 253 } 254 ((struct stat *) m)->st_dev = NODEV; 255 if (unp->unp_ino == 0) 256 unp->unp_ino = unp_ino++; 257 ((struct stat *) m)->st_ino = unp->unp_ino; 258 return (0); 259 260 case PRU_RCVOOB: 261 return (EOPNOTSUPP); 262 263 case PRU_SENDOOB: 264 error = EOPNOTSUPP; 265 break; 266 267 case PRU_SOCKADDR: 268 if (unp->unp_addr) { 269 nam->m_len = unp->unp_addr->m_len; 270 bcopy(mtod(unp->unp_addr, caddr_t), 271 mtod(nam, caddr_t), (unsigned)nam->m_len); 272 } else 273 nam->m_len = 0; 274 break; 275 276 case PRU_PEERADDR: 277 if (unp->unp_conn && unp->unp_conn->unp_addr) { 278 nam->m_len = unp->unp_conn->unp_addr->m_len; 279 bcopy(mtod(unp->unp_conn->unp_addr, caddr_t), 280 mtod(nam, caddr_t), (unsigned)nam->m_len); 281 } else 282 nam->m_len = 0; 283 break; 284 285 case PRU_SLOWTIMO: 286 break; 287 288 default: 289 panic("piusrreq"); 290 } 291 release: 292 if (control) 293 m_freem(control); 294 if (m) 295 m_freem(m); 296 return (error); 297 } 298 299 /* 300 * Both send and receive buffers are allocated PIPSIZ bytes of buffering 301 * for stream sockets, although the total for sender and receiver is 302 * actually only PIPSIZ. 303 * Datagram sockets really use the sendspace as the maximum datagram size, 304 * and don't really want to reserve the sendspace. Their recvspace should 305 * be large enough for at least one max-size datagram plus address. 306 */ 307 #define PIPSIZ 4096 308 u_long unpst_sendspace = PIPSIZ; 309 u_long unpst_recvspace = PIPSIZ; 310 u_long unpdg_sendspace = 2*1024; /* really max datagram size */ 311 u_long unpdg_recvspace = 4*1024; 312 313 int unp_rights; /* file descriptors in flight */ 314 315 unp_attach(so) 316 struct socket *so; 317 { 318 register struct mbuf *m; 319 register struct unpcb *unp; 320 int error; 321 322 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 323 switch (so->so_type) { 324 325 case SOCK_STREAM: 326 error = soreserve(so, unpst_sendspace, unpst_recvspace); 327 break; 328 329 case SOCK_DGRAM: 330 error = soreserve(so, unpdg_sendspace, unpdg_recvspace); 331 break; 332 } 333 if (error) 334 return (error); 335 } 336 m = m_getclr(M_DONTWAIT, MT_PCB); 337 if (m == NULL) 338 return (ENOBUFS); 339 unp = mtod(m, struct unpcb *); 340 so->so_pcb = (caddr_t)unp; 341 unp->unp_socket = so; 342 return (0); 343 } 344 345 unp_detach(unp) 346 register struct unpcb *unp; 347 { 348 349 if (unp->unp_vnode) { 350 unp->unp_vnode->v_socket = 0; 351 vrele(unp->unp_vnode); 352 unp->unp_vnode = 0; 353 } 354 if (unp->unp_conn) 355 unp_disconnect(unp); 356 while (unp->unp_refs) 357 unp_drop(unp->unp_refs, ECONNRESET); 358 soisdisconnected(unp->unp_socket); 359 unp->unp_socket->so_pcb = 0; 360 m_freem(unp->unp_addr); 361 (void) m_free(dtom(unp)); 362 if (unp_rights) 363 unp_gc(); 364 } 365 366 unp_bind(unp, nam, p) 367 struct unpcb *unp; 368 struct mbuf *nam; 369 struct proc *p; 370 { 371 struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 372 register struct vnode *vp; 373 register struct nameidata *ndp; 374 struct vattr vattr; 375 int error; 376 struct nameidata nd; 377 378 ndp = &nd; 379 ndp->ni_dirp = soun->sun_path; 380 if (unp->unp_vnode != NULL) 381 return (EINVAL); 382 if (nam->m_len == MLEN) { 383 if (*(mtod(nam, caddr_t) + nam->m_len - 1) != 0) 384 return (EINVAL); 385 } else 386 *(mtod(nam, caddr_t) + nam->m_len) = 0; 387 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ 388 ndp->ni_nameiop = CREATE | FOLLOW | LOCKPARENT; 389 ndp->ni_segflg = UIO_SYSSPACE; 390 if (error = namei(ndp, p)) 391 return (error); 392 vp = ndp->ni_vp; 393 if (vp != NULL) { 394 VOP_ABORTOP(ndp); 395 if (ndp->ni_dvp == vp) 396 vrele(ndp->ni_dvp); 397 else 398 vput(ndp->ni_dvp); 399 vrele(vp); 400 return (EADDRINUSE); 401 } 402 VATTR_NULL(&vattr); 403 vattr.va_type = VSOCK; 404 vattr.va_mode = 0777; 405 if (error = VOP_CREATE(ndp, &vattr, p)) 406 return (error); 407 vp = ndp->ni_vp; 408 vp->v_socket = unp->unp_socket; 409 unp->unp_vnode = vp; 410 unp->unp_addr = m_copy(nam, 0, (int)M_COPYALL); 411 VOP_UNLOCK(vp); 412 return (0); 413 } 414 415 unp_connect(so, nam, p) 416 struct socket *so; 417 struct mbuf *nam; 418 struct proc *p; 419 { 420 register struct sockaddr_un *soun = mtod(nam, struct sockaddr_un *); 421 register struct vnode *vp; 422 register struct socket *so2, *so3; 423 register struct nameidata *ndp; 424 struct unpcb *unp2, *unp3; 425 int error; 426 struct nameidata nd; 427 428 ndp = &nd; 429 ndp->ni_dirp = soun->sun_path; 430 if (nam->m_data + nam->m_len == &nam->m_dat[MLEN]) { /* XXX */ 431 if (*(mtod(nam, caddr_t) + nam->m_len - 1) != 0) 432 return (EMSGSIZE); 433 } else 434 *(mtod(nam, caddr_t) + nam->m_len) = 0; 435 ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF; 436 ndp->ni_segflg = UIO_SYSSPACE; 437 if (error = namei(ndp, p)) 438 return (error); 439 vp = ndp->ni_vp; 440 if (vp->v_type != VSOCK) { 441 error = ENOTSOCK; 442 goto bad; 443 } 444 if (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) 445 goto bad; 446 so2 = vp->v_socket; 447 if (so2 == 0) { 448 error = ECONNREFUSED; 449 goto bad; 450 } 451 if (so->so_type != so2->so_type) { 452 error = EPROTOTYPE; 453 goto bad; 454 } 455 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 456 if ((so2->so_options & SO_ACCEPTCONN) == 0 || 457 (so3 = sonewconn(so2, 0)) == 0) { 458 error = ECONNREFUSED; 459 goto bad; 460 } 461 unp2 = sotounpcb(so2); 462 unp3 = sotounpcb(so3); 463 if (unp2->unp_addr) 464 unp3->unp_addr = 465 m_copy(unp2->unp_addr, 0, (int)M_COPYALL); 466 so2 = so3; 467 } 468 error = unp_connect2(so, so2); 469 bad: 470 vput(vp); 471 return (error); 472 } 473 474 unp_connect2(so, so2) 475 register struct socket *so; 476 register struct socket *so2; 477 { 478 register struct unpcb *unp = sotounpcb(so); 479 register struct unpcb *unp2; 480 481 if (so2->so_type != so->so_type) 482 return (EPROTOTYPE); 483 unp2 = sotounpcb(so2); 484 unp->unp_conn = unp2; 485 switch (so->so_type) { 486 487 case SOCK_DGRAM: 488 unp->unp_nextref = unp2->unp_refs; 489 unp2->unp_refs = unp; 490 soisconnected(so); 491 break; 492 493 case SOCK_STREAM: 494 unp2->unp_conn = unp; 495 soisconnected(so); 496 soisconnected(so2); 497 break; 498 499 default: 500 panic("unp_connect2"); 501 } 502 return (0); 503 } 504 505 unp_disconnect(unp) 506 struct unpcb *unp; 507 { 508 register struct unpcb *unp2 = unp->unp_conn; 509 510 if (unp2 == 0) 511 return; 512 unp->unp_conn = 0; 513 switch (unp->unp_socket->so_type) { 514 515 case SOCK_DGRAM: 516 if (unp2->unp_refs == unp) 517 unp2->unp_refs = unp->unp_nextref; 518 else { 519 unp2 = unp2->unp_refs; 520 for (;;) { 521 if (unp2 == 0) 522 panic("unp_disconnect"); 523 if (unp2->unp_nextref == unp) 524 break; 525 unp2 = unp2->unp_nextref; 526 } 527 unp2->unp_nextref = unp->unp_nextref; 528 } 529 unp->unp_nextref = 0; 530 unp->unp_socket->so_state &= ~SS_ISCONNECTED; 531 break; 532 533 case SOCK_STREAM: 534 soisdisconnected(unp->unp_socket); 535 unp2->unp_conn = 0; 536 soisdisconnected(unp2->unp_socket); 537 break; 538 } 539 } 540 541 #ifdef notdef 542 unp_abort(unp) 543 struct unpcb *unp; 544 { 545 546 unp_detach(unp); 547 } 548 #endif 549 550 unp_shutdown(unp) 551 struct unpcb *unp; 552 { 553 struct socket *so; 554 555 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn && 556 (so = unp->unp_conn->unp_socket)) 557 socantrcvmore(so); 558 } 559 560 unp_drop(unp, errno) 561 struct unpcb *unp; 562 int errno; 563 { 564 struct socket *so = unp->unp_socket; 565 566 so->so_error = errno; 567 unp_disconnect(unp); 568 if (so->so_head) { 569 so->so_pcb = (caddr_t) 0; 570 m_freem(unp->unp_addr); 571 (void) m_free(dtom(unp)); 572 sofree(so); 573 } 574 } 575 576 #ifdef notdef 577 unp_drain() 578 { 579 580 } 581 #endif 582 583 unp_externalize(rights) 584 struct mbuf *rights; 585 { 586 struct proc *p = curproc; /* XXX */ 587 register int i; 588 register struct cmsghdr *cm = mtod(rights, struct cmsghdr *); 589 register struct file **rp = (struct file **)(cm + 1); 590 register struct file *fp; 591 int newfds = (cm->cmsg_len - sizeof(*cm)) / sizeof (int); 592 int f; 593 594 if (fdavail(p, newfds)) { 595 for (i = 0; i < newfds; i++) { 596 fp = *rp; 597 unp_discard(fp); 598 *rp++ = 0; 599 } 600 return (EMSGSIZE); 601 } 602 for (i = 0; i < newfds; i++) { 603 if (fdalloc(p, 0, &f)) 604 panic("unp_externalize"); 605 fp = *rp; 606 p->p_fd->fd_ofiles[f] = fp; 607 fp->f_msgcount--; 608 unp_rights--; 609 *(int *)rp++ = f; 610 } 611 return (0); 612 } 613 614 unp_internalize(control, p) 615 struct mbuf *control; 616 struct proc *p; 617 { 618 struct filedesc *fdp = p->p_fd; 619 register struct cmsghdr *cm = mtod(control, struct cmsghdr *); 620 register struct file **rp; 621 register struct file *fp; 622 register int i, fd; 623 int oldfds; 624 625 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 626 cm->cmsg_len != control->m_len) 627 return (EINVAL); 628 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int); 629 rp = (struct file **)(cm + 1); 630 for (i = 0; i < oldfds; i++) { 631 fd = *(int *)rp++; 632 if ((unsigned)fd >= fdp->fd_nfiles || 633 fdp->fd_ofiles[fd] == NULL) 634 return (EBADF); 635 } 636 rp = (struct file **)(cm + 1); 637 for (i = 0; i < oldfds; i++) { 638 fp = fdp->fd_ofiles[*(int *)rp]; 639 *rp++ = fp; 640 fp->f_count++; 641 fp->f_msgcount++; 642 unp_rights++; 643 } 644 return (0); 645 } 646 647 int unp_defer, unp_gcing; 648 int unp_mark(); 649 extern struct domain unixdomain; 650 651 unp_gc() 652 { 653 register struct file *fp; 654 register struct socket *so; 655 656 if (unp_gcing) 657 return; 658 unp_gcing = 1; 659 restart: 660 unp_defer = 0; 661 for (fp = filehead; fp; fp = fp->f_filef) 662 fp->f_flag &= ~(FMARK|FDEFER); 663 do { 664 for (fp = filehead; fp; fp = fp->f_filef) { 665 if (fp->f_count == 0) 666 continue; 667 if (fp->f_flag & FDEFER) { 668 fp->f_flag &= ~FDEFER; 669 unp_defer--; 670 } else { 671 if (fp->f_flag & FMARK) 672 continue; 673 if (fp->f_count == fp->f_msgcount) 674 continue; 675 fp->f_flag |= FMARK; 676 } 677 if (fp->f_type != DTYPE_SOCKET || 678 (so = (struct socket *)fp->f_data) == 0) 679 continue; 680 if (so->so_proto->pr_domain != &unixdomain || 681 (so->so_proto->pr_flags&PR_RIGHTS) == 0) 682 continue; 683 #ifdef notdef 684 if (so->so_rcv.sb_flags & SB_LOCK) { 685 /* 686 * This is problematical; it's not clear 687 * we need to wait for the sockbuf to be 688 * unlocked (on a uniprocessor, at least), 689 * and it's also not clear what to do 690 * if sbwait returns an error due to receipt 691 * of a signal. If sbwait does return 692 * an error, we'll go into an infinite 693 * loop. Delete all of this for now. 694 */ 695 (void) sbwait(&so->so_rcv); 696 goto restart; 697 } 698 #endif 699 unp_scan(so->so_rcv.sb_mb, unp_mark); 700 } 701 } while (unp_defer); 702 for (fp = filehead; fp; fp = fp->f_filef) { 703 if (fp->f_count == 0) 704 continue; 705 if (fp->f_count == fp->f_msgcount && (fp->f_flag & FMARK) == 0) 706 while (fp->f_msgcount) 707 unp_discard(fp); 708 } 709 unp_gcing = 0; 710 } 711 712 unp_dispose(m) 713 struct mbuf *m; 714 { 715 int unp_discard(); 716 717 if (m) 718 unp_scan(m, unp_discard); 719 } 720 721 unp_scan(m0, op) 722 register struct mbuf *m0; 723 int (*op)(); 724 { 725 register struct mbuf *m; 726 register struct file **rp; 727 register struct cmsghdr *cm; 728 register int i; 729 int qfds; 730 731 while (m0) { 732 for (m = m0; m; m = m->m_next) 733 if (m->m_type == MT_CONTROL && 734 m->m_len >= sizeof(*cm)) { 735 cm = mtod(m, struct cmsghdr *); 736 if (cm->cmsg_level != SOL_SOCKET || 737 cm->cmsg_type != SCM_RIGHTS) 738 continue; 739 qfds = (cm->cmsg_len - sizeof *cm) 740 / sizeof (struct file *); 741 rp = (struct file **)(cm + 1); 742 for (i = 0; i < qfds; i++) 743 (*op)(*rp++); 744 break; /* XXX, but saves time */ 745 } 746 m0 = m0->m_act; 747 } 748 } 749 750 unp_mark(fp) 751 struct file *fp; 752 { 753 754 if (fp->f_flag & FMARK) 755 return; 756 unp_defer++; 757 fp->f_flag |= (FMARK|FDEFER); 758 } 759 760 unp_discard(fp) 761 struct file *fp; 762 { 763 764 fp->f_msgcount--; 765 unp_rights--; 766 (void) closef(fp, curproc); 767 } 768
Indexes created Sun Sep 21 20:09:37 GMT 2025