1 /* 2 * Copyright (c) 1993, 1995 Jan-Simon Pendry 3 * Copyright (c) 1993, 1995 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)procfs_vnops.c 8.17 (Berkeley) 05/14/95 12 * 13 * From: 14 * $Id: procfs_vnops.c,v 3.2 1993/12/15 09:40:17 jsp Exp $ 15 */ 16 17 /* 18 * procfs vnode interface 19 */ 20 21 #include <sys/param.h> 22 #include <sys/systm.h> 23 #include <sys/time.h> 24 #include <sys/kernel.h> 25 #include <sys/file.h> 26 #include <sys/proc.h> 27 #include <sys/vnode.h> 28 #include <sys/namei.h> 29 #include <sys/malloc.h> 30 #include <sys/dirent.h> 31 #include <sys/resourcevar.h> 32 #include <vm/vm.h> /* for PAGE_SIZE */ 33 #include <machine/reg.h> 34 #include <miscfs/procfs/procfs.h> 35 36 /* 37 * Vnode Operations. 38 * 39 */ 40 41 /* 42 * This is a list of the valid names in the 43 * process-specific sub-directories. It is 44 * used in procfs_lookup and procfs_readdir 45 */ 46 struct proc_target { 47 u_char pt_type; 48 u_char pt_namlen; 49 char *pt_name; 50 pfstype pt_pfstype; 51 int (*pt_valid) __P((struct proc *p)); 52 } proc_targets[] = { 53 #define N(s) sizeof(s)-1, s 54 /* name type validp */ 55 { DT_DIR, N("."), Pproc, NULL }, 56 { DT_DIR, N(".."), Proot, NULL }, 57 { DT_REG, N("file"), Pfile, procfs_validfile }, 58 { DT_REG, N("mem"), Pmem, NULL }, 59 { DT_REG, N("regs"), Pregs, procfs_validregs }, 60 { DT_REG, N("fpregs"), Pfpregs, procfs_validfpregs }, 61 { DT_REG, N("ctl"), Pctl, NULL }, 62 { DT_REG, N("status"), Pstatus, NULL }, 63 { DT_REG, N("note"), Pnote, NULL }, 64 { DT_REG, N("notepg"), Pnotepg, NULL }, 65 #undef N 66 }; 67 static int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]); 68 69 static pid_t atopid __P((const char *, u_int)); 70 71 /* 72 * set things up for doing i/o on 73 * the pfsnode (vp). (vp) is locked 74 * on entry, and should be left locked 75 * on exit. 76 * 77 * for procfs we don't need to do anything 78 * in particular for i/o. all that is done 79 * is to support exclusive open on process 80 * memory images. 81 */ 82 procfs_open(ap) 83 struct vop_open_args /* { 84 struct vnode *a_vp; 85 int a_mode; 86 struct ucred *a_cred; 87 struct proc *a_p; 88 } */ *ap; 89 { 90 struct pfsnode *pfs = VTOPFS(ap->a_vp); 91 92 switch (pfs->pfs_type) { 93 case Pmem: 94 if (PFIND(pfs->pfs_pid) == 0) 95 return (ENOENT); /* was ESRCH, jsp */ 96 97 if ((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL) || 98 (pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE)) 99 return (EBUSY); 100 101 if (ap->a_mode & FWRITE) 102 pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL); 103 104 return (0); 105 106 default: 107 break; 108 } 109 110 return (0); 111 } 112 113 /* 114 * close the pfsnode (vp) after doing i/o. 115 * (vp) is not locked on entry or exit. 116 * 117 * nothing to do for procfs other than undo 118 * any exclusive open flag (see _open above). 119 */ 120 procfs_close(ap) 121 struct vop_close_args /* { 122 struct vnode *a_vp; 123 int a_fflag; 124 struct ucred *a_cred; 125 struct proc *a_p; 126 } */ *ap; 127 { 128 struct pfsnode *pfs = VTOPFS(ap->a_vp); 129 130 switch (pfs->pfs_type) { 131 case Pmem: 132 if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL)) 133 pfs->pfs_flags &= ~(FWRITE|O_EXCL); 134 break; 135 } 136 137 return (0); 138 } 139 140 /* 141 * do an ioctl operation on pfsnode (vp). 142 * (vp) is not locked on entry or exit. 143 */ 144 procfs_ioctl(ap) 145 struct vop_ioctl_args /* { 146 struct vnode *a_vp; 147 int a_command; 148 caddr_t a_data; 149 int a_fflag; 150 struct ucred *a_cred; 151 struct proc *a_p; 152 } */ *ap; 153 { 154 155 return (ENOTTY); 156 } 157 158 /* 159 * do block mapping for pfsnode (vp). 160 * since we don't use the buffer cache 161 * for procfs this function should never 162 * be called. in any case, it's not clear 163 * what part of the kernel ever makes use 164 * of this function. for sanity, this is the 165 * usual no-op bmap, although returning 166 * (EIO) would be a reasonable alternative. 167 */ 168 procfs_bmap(ap) 169 struct vop_bmap_args /* { 170 struct vnode *a_vp; 171 daddr_t a_bn; 172 struct vnode **a_vpp; 173 daddr_t *a_bnp; 174 int *a_runp; 175 } */ *ap; 176 { 177 178 if (ap->a_vpp != NULL) 179 *ap->a_vpp = ap->a_vp; 180 if (ap->a_bnp != NULL) 181 *ap->a_bnp = ap->a_bn; 182 if (ap->a_runp != NULL) 183 *ap->a_runp = 0; 184 return (0); 185 } 186 187 /* 188 * _inactive is called when the pfsnode 189 * is vrele'd and the reference count goes 190 * to zero. (vp) will be on the vnode free 191 * list, so to get it back vget() must be 192 * used. 193 * 194 * for procfs, check if the process is still 195 * alive and if it isn't then just throw away 196 * the vnode by calling vgone(). this may 197 * be overkill and a waste of time since the 198 * chances are that the process will still be 199 * there and PFIND is not free. 200 * 201 * (vp) is not locked on entry or exit. 202 */ 203 procfs_inactive(ap) 204 struct vop_inactive_args /* { 205 struct vnode *a_vp; 206 } */ *ap; 207 { 208 struct pfsnode *pfs = VTOPFS(ap->a_vp); 209 210 if (PFIND(pfs->pfs_pid) == 0) 211 vgone(ap->a_vp); 212 213 return (0); 214 } 215 216 /* 217 * _reclaim is called when getnewvnode() 218 * wants to make use of an entry on the vnode 219 * free list. at this time the filesystem needs 220 * to free any private data and remove the node 221 * from any private lists. 222 */ 223 procfs_reclaim(ap) 224 struct vop_reclaim_args /* { 225 struct vnode *a_vp; 226 } */ *ap; 227 { 228 229 return (procfs_freevp(ap->a_vp)); 230 } 231 232 /* 233 * Return POSIX pathconf information applicable to special devices. 234 */ 235 procfs_pathconf(ap) 236 struct vop_pathconf_args /* { 237 struct vnode *a_vp; 238 int a_name; 239 int *a_retval; 240 } */ *ap; 241 { 242 243 switch (ap->a_name) { 244 case _PC_LINK_MAX: 245 *ap->a_retval = LINK_MAX; 246 return (0); 247 case _PC_MAX_CANON: 248 *ap->a_retval = MAX_CANON; 249 return (0); 250 case _PC_MAX_INPUT: 251 *ap->a_retval = MAX_INPUT; 252 return (0); 253 case _PC_PIPE_BUF: 254 *ap->a_retval = PIPE_BUF; 255 return (0); 256 case _PC_CHOWN_RESTRICTED: 257 *ap->a_retval = 1; 258 return (0); 259 case _PC_VDISABLE: 260 *ap->a_retval = _POSIX_VDISABLE; 261 return (0); 262 default: 263 return (EINVAL); 264 } 265 /* NOTREACHED */ 266 } 267 268 /* 269 * _print is used for debugging. 270 * just print a readable description 271 * of (vp). 272 */ 273 procfs_print(ap) 274 struct vop_print_args /* { 275 struct vnode *a_vp; 276 } */ *ap; 277 { 278 struct pfsnode *pfs = VTOPFS(ap->a_vp); 279 280 printf("tag VT_PROCFS, type %s, pid %d, mode %x, flags %x\n", 281 pfs->pfs_type, pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags); 282 } 283 284 /* 285 * _abortop is called when operations such as 286 * rename and create fail. this entry is responsible 287 * for undoing any side-effects caused by the lookup. 288 * this will always include freeing the pathname buffer. 289 */ 290 procfs_abortop(ap) 291 struct vop_abortop_args /* { 292 struct vnode *a_dvp; 293 struct componentname *a_cnp; 294 } */ *ap; 295 { 296 297 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 298 FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); 299 return (0); 300 } 301 302 /* 303 * generic entry point for unsupported operations 304 */ 305 procfs_badop() 306 { 307 308 return (EIO); 309 } 310 311 /* 312 * Invent attributes for pfsnode (vp) and store 313 * them in (vap). 314 * Directories lengths are returned as zero since 315 * any real length would require the genuine size 316 * to be computed, and nothing cares anyway. 317 * 318 * this is relatively minimal for procfs. 319 */ 320 procfs_getattr(ap) 321 struct vop_getattr_args /* { 322 struct vnode *a_vp; 323 struct vattr *a_vap; 324 struct ucred *a_cred; 325 struct proc *a_p; 326 } */ *ap; 327 { 328 struct pfsnode *pfs = VTOPFS(ap->a_vp); 329 struct vattr *vap = ap->a_vap; 330 struct proc *procp; 331 struct timeval tv; 332 int error; 333 334 /* first check the process still exists */ 335 switch (pfs->pfs_type) { 336 case Proot: 337 case Pcurproc: 338 procp = 0; 339 break; 340 341 default: 342 procp = PFIND(pfs->pfs_pid); 343 if (procp == 0) 344 return (ENOENT); 345 } 346 347 error = 0; 348 349 /* start by zeroing out the attributes */ 350 VATTR_NULL(vap); 351 352 /* next do all the common fields */ 353 vap->va_type = ap->a_vp->v_type; 354 vap->va_mode = pfs->pfs_mode; 355 vap->va_fileid = pfs->pfs_fileno; 356 vap->va_flags = 0; 357 vap->va_blocksize = PAGE_SIZE; 358 vap->va_bytes = vap->va_size = 0; 359 360 /* 361 * Make all times be current TOD. 362 * It would be possible to get the process start 363 * time from the p_stat structure, but there's 364 * no "file creation" time stamp anyway, and the 365 * p_stat structure is not addressible if u. gets 366 * swapped out for that process. 367 */ 368 microtime(&tv); 369 TIMEVAL_TO_TIMESPEC(&tv, &vap->va_ctime); 370 vap->va_atime = vap->va_mtime = vap->va_ctime; 371 372 /* 373 * If the process has exercised some setuid or setgid 374 * privilege, then rip away read/write permission so 375 * that only root can gain access. 376 */ 377 switch (pfs->pfs_type) { 378 case Pmem: 379 case Pregs: 380 case Pfpregs: 381 if (procp->p_flag & P_SUGID) 382 vap->va_mode &= ~((VREAD|VWRITE)| 383 ((VREAD|VWRITE)>>3)| 384 ((VREAD|VWRITE)>>6)); 385 case Pctl: 386 case Pstatus: 387 case Pnote: 388 case Pnotepg: 389 vap->va_nlink = 1; 390 vap->va_uid = procp->p_ucred->cr_uid; 391 vap->va_gid = procp->p_ucred->cr_gid; 392 break; 393 } 394 395 /* 396 * now do the object specific fields 397 * 398 * The size could be set from struct reg, but it's hardly 399 * worth the trouble, and it puts some (potentially) machine 400 * dependent data into this machine-independent code. If it 401 * becomes important then this function should break out into 402 * a per-file stat function in the corresponding .c file. 403 */ 404 405 switch (pfs->pfs_type) { 406 case Proot: 407 /* 408 * Set nlink to 1 to tell fts(3) we don't actually know. 409 */ 410 vap->va_nlink = 1; 411 vap->va_uid = 0; 412 vap->va_gid = 0; 413 vap->va_size = vap->va_bytes = DEV_BSIZE; 414 break; 415 416 case Pcurproc: { 417 char buf[16]; /* should be enough */ 418 vap->va_nlink = 1; 419 vap->va_uid = 0; 420 vap->va_gid = 0; 421 vap->va_size = vap->va_bytes = 422 sprintf(buf, "%ld", (long)curproc->p_pid); 423 break; 424 } 425 426 case Pproc: 427 vap->va_nlink = 2; 428 vap->va_uid = procp->p_ucred->cr_uid; 429 vap->va_gid = procp->p_ucred->cr_gid; 430 vap->va_size = vap->va_bytes = DEV_BSIZE; 431 break; 432 433 case Pfile: 434 error = EOPNOTSUPP; 435 break; 436 437 case Pmem: 438 vap->va_bytes = vap->va_size = 439 ctob(procp->p_vmspace->vm_tsize + 440 procp->p_vmspace->vm_dsize + 441 procp->p_vmspace->vm_ssize); 442 break; 443 444 case Pregs: 445 vap->va_bytes = vap->va_size = sizeof(struct reg); 446 break; 447 448 case Pfpregs: 449 vap->va_bytes = vap->va_size = sizeof(struct fpreg); 450 break; 451 452 case Pctl: 453 case Pstatus: 454 case Pnote: 455 case Pnotepg: 456 break; 457 458 default: 459 panic("procfs_getattr"); 460 } 461 462 return (error); 463 } 464 465 procfs_setattr(ap) 466 struct vop_setattr_args /* { 467 struct vnode *a_vp; 468 struct vattr *a_vap; 469 struct ucred *a_cred; 470 struct proc *a_p; 471 } */ *ap; 472 { 473 /* 474 * just fake out attribute setting 475 * it's not good to generate an error 476 * return, otherwise things like creat() 477 * will fail when they try to set the 478 * file length to 0. worse, this means 479 * that echo $note > /proc/$pid/note will fail. 480 */ 481 482 return (0); 483 } 484 485 /* 486 * implement access checking. 487 * 488 * something very similar to this code is duplicated 489 * throughout the 4bsd kernel and should be moved 490 * into kern/vfs_subr.c sometime. 491 * 492 * actually, the check for super-user is slightly 493 * broken since it will allow read access to write-only 494 * objects. this doesn't cause any particular trouble 495 * but does mean that the i/o entry points need to check 496 * that the operation really does make sense. 497 */ 498 procfs_access(ap) 499 struct vop_access_args /* { 500 struct vnode *a_vp; 501 int a_mode; 502 struct ucred *a_cred; 503 struct proc *a_p; 504 } */ *ap; 505 { 506 struct vattr *vap; 507 struct vattr vattr; 508 int error; 509 510 /* 511 * If you're the super-user, 512 * you always get access. 513 */ 514 if (ap->a_cred->cr_uid == 0) 515 return (0); 516 517 vap = &vattr; 518 if (error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_p)) 519 return (error); 520 521 /* 522 * Access check is based on only one of owner, group, public. 523 * If not owner, then check group. If not a member of the 524 * group, then check public access. 525 */ 526 if (ap->a_cred->cr_uid != vap->va_uid) { 527 gid_t *gp; 528 int i; 529 530 ap->a_mode >>= 3; 531 gp = ap->a_cred->cr_groups; 532 for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++) 533 if (vap->va_gid == *gp) 534 goto found; 535 ap->a_mode >>= 3; 536 found: 537 ; 538 } 539 540 if ((vap->va_mode & ap->a_mode) == ap->a_mode) 541 return (0); 542 543 return (EACCES); 544 } 545 546 /* 547 * lookup. this is incredibly complicated in the 548 * general case, however for most pseudo-filesystems 549 * very little needs to be done. 550 * 551 * unless you want to get a migraine, just make sure your 552 * filesystem doesn't do any locking of its own. otherwise 553 * read and inwardly digest ufs_lookup(). 554 */ 555 procfs_lookup(ap) 556 struct vop_lookup_args /* { 557 struct vnode * a_dvp; 558 struct vnode ** a_vpp; 559 struct componentname * a_cnp; 560 } */ *ap; 561 { 562 struct componentname *cnp = ap->a_cnp; 563 struct vnode **vpp = ap->a_vpp; 564 struct vnode *dvp = ap->a_dvp; 565 char *pname = cnp->cn_nameptr; 566 struct proc *curp = cnp->cn_proc; 567 int error = 0; 568 struct proc_target *pt; 569 struct vnode *fvp; 570 pid_t pid; 571 struct pfsnode *pfs; 572 struct proc *p; 573 int i; 574 575 *vpp = NULL; 576 577 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 578 return (EROFS); 579 580 if (cnp->cn_namelen == 1 && *pname == '.') { 581 *vpp = dvp; 582 VREF(dvp); 583 /* vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, curp); */ 584 return (0); 585 } 586 587 pfs = VTOPFS(dvp); 588 switch (pfs->pfs_type) { 589 case Proot: 590 if (cnp->cn_flags & ISDOTDOT) 591 return (EIO); 592 593 if (CNEQ(cnp, "curproc", 7)) 594 return (procfs_allocvp(dvp->v_mount, vpp, 0, Pcurproc)); 595 596 pid = atopid(pname, cnp->cn_namelen); 597 if (pid == NO_PID) 598 break; 599 600 p = PFIND(pid); 601 if (p == 0) 602 break; 603 604 return (procfs_allocvp(dvp->v_mount, vpp, pid, Pproc)); 605 606 case Pproc: 607 if (cnp->cn_flags & ISDOTDOT) 608 return (procfs_root(dvp->v_mount, vpp)); 609 610 p = PFIND(pfs->pfs_pid); 611 if (p == 0) 612 break; 613 614 for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) { 615 if (cnp->cn_namelen == pt->pt_namlen && 616 bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 && 617 (pt->pt_valid == NULL || (*pt->pt_valid)(p))) 618 goto found; 619 } 620 break; 621 622 found: 623 if (pt->pt_pfstype == Pfile) { 624 fvp = procfs_findtextvp(p); 625 /* We already checked that it exists. */ 626 VREF(fvp); 627 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, curp); 628 *vpp = fvp; 629 return (0); 630 } 631 632 return (procfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid, 633 pt->pt_pfstype)); 634 635 default: 636 return (ENOTDIR); 637 } 638 639 return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS); 640 } 641 642 int 643 procfs_validfile(p) 644 struct proc *p; 645 { 646 647 return (procfs_findtextvp(p) != NULLVP); 648 } 649 650 /* 651 * readdir returns directory entries from pfsnode (vp). 652 * 653 * the strategy here with procfs is to generate a single 654 * directory entry at a time (struct pfsdent) and then 655 * copy that out to userland using uiomove. a more efficent 656 * though more complex implementation, would try to minimize 657 * the number of calls to uiomove(). for procfs, this is 658 * hardly worth the added code complexity. 659 * 660 * this should just be done through read() 661 */ 662 procfs_readdir(ap) 663 struct vop_readdir_args /* { 664 struct vnode *a_vp; 665 struct uio *a_uio; 666 struct ucred *a_cred; 667 int *a_eofflag; 668 u_long *a_cookies; 669 int a_ncookies; 670 } */ *ap; 671 { 672 struct uio *uio = ap->a_uio; 673 struct pfsdent d; 674 struct pfsdent *dp = &d; 675 struct pfsnode *pfs; 676 int error; 677 int count; 678 int i; 679 680 /* 681 * We don't allow exporting procfs mounts, and currently local 682 * requests do not need cookies. 683 */ 684 if (ap->a_ncookies) 685 panic("procfs_readdir: not hungry"); 686 687 pfs = VTOPFS(ap->a_vp); 688 689 if (uio->uio_resid < UIO_MX) 690 return (EINVAL); 691 if (uio->uio_offset & (UIO_MX-1)) 692 return (EINVAL); 693 if (uio->uio_offset < 0) 694 return (EINVAL); 695 696 error = 0; 697 count = 0; 698 i = uio->uio_offset / UIO_MX; 699 700 switch (pfs->pfs_type) { 701 /* 702 * this is for the process-specific sub-directories. 703 * all that is needed to is copy out all the entries 704 * from the procent[] table (top of this file). 705 */ 706 case Pproc: { 707 struct proc *p; 708 struct proc_target *pt; 709 710 p = PFIND(pfs->pfs_pid); 711 if (p == NULL) 712 break; 713 714 for (pt = &proc_targets[i]; 715 uio->uio_resid >= UIO_MX && i < nproc_targets; pt++, i++) { 716 if (pt->pt_valid && (*pt->pt_valid)(p) == 0) 717 continue; 718 719 dp->d_reclen = UIO_MX; 720 dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype); 721 dp->d_namlen = pt->pt_namlen; 722 bcopy(pt->pt_name, dp->d_name, pt->pt_namlen + 1); 723 dp->d_type = pt->pt_type; 724 725 if (error = uiomove((caddr_t)dp, UIO_MX, uio)) 726 break; 727 } 728 729 break; 730 } 731 732 /* 733 * this is for the root of the procfs filesystem 734 * what is needed is a special entry for "curproc" 735 * followed by an entry for each process on allproc 736 #ifdef PROCFS_ZOMBIE 737 * and zombproc. 738 #endif 739 */ 740 741 case Proot: { 742 #ifdef PROCFS_ZOMBIE 743 int doingzomb = 0; 744 #endif 745 int pcnt = 0; 746 volatile struct proc *p = allproc.lh_first; 747 748 again: 749 for (; p && uio->uio_resid >= UIO_MX; i++, pcnt++) { 750 bzero((char *) dp, UIO_MX); 751 dp->d_reclen = UIO_MX; 752 753 switch (i) { 754 case 0: /* `.' */ 755 case 1: /* `..' */ 756 dp->d_fileno = PROCFS_FILENO(0, Proot); 757 dp->d_namlen = i + 1; 758 bcopy("..", dp->d_name, dp->d_namlen); 759 dp->d_name[i + 1] = '\0'; 760 dp->d_type = DT_DIR; 761 break; 762 763 case 2: 764 dp->d_fileno = PROCFS_FILENO(0, Pcurproc); 765 dp->d_namlen = 7; 766 bcopy("curproc", dp->d_name, 8); 767 dp->d_type = DT_LNK; 768 break; 769 770 default: 771 while (pcnt < i) { 772 pcnt++; 773 p = p->p_list.le_next; 774 if (!p) 775 goto done; 776 } 777 dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc); 778 dp->d_namlen = sprintf(dp->d_name, "%ld", 779 (long)p->p_pid); 780 dp->d_type = DT_REG; 781 p = p->p_list.le_next; 782 break; 783 } 784 785 if (error = uiomove((caddr_t)dp, UIO_MX, uio)) 786 break; 787 } 788 done: 789 790 #ifdef PROCFS_ZOMBIE 791 if (p == 0 && doingzomb == 0) { 792 doingzomb = 1; 793 p = zombproc.lh_first; 794 goto again; 795 } 796 #endif 797 798 break; 799 800 } 801 802 default: 803 error = ENOTDIR; 804 break; 805 } 806 807 uio->uio_offset = i * UIO_MX; 808 809 return (error); 810 } 811 812 /* 813 * readlink reads the link of `curproc' 814 */ 815 procfs_readlink(ap) 816 struct vop_readlink_args *ap; 817 { 818 struct uio *uio = ap->a_uio; 819 char buf[16]; /* should be enough */ 820 int len; 821 822 if (VTOPFS(ap->a_vp)->pfs_fileno != PROCFS_FILENO(0, Pcurproc)) 823 return (EINVAL); 824 825 len = sprintf(buf, "%ld", (long)curproc->p_pid); 826 827 return (uiomove((caddr_t)buf, len, ap->a_uio)); 828 } 829 830 /* 831 * convert decimal ascii to pid_t 832 */ 833 static pid_t 834 atopid(b, len) 835 const char *b; 836 u_int len; 837 { 838 pid_t p = 0; 839 840 while (len--) { 841 char c = *b++; 842 if (c < '0' || c > '9') 843 return (NO_PID); 844 p = 10 * p + (c - '0'); 845 if (p > PID_MAX) 846 return (NO_PID); 847 } 848 849 return (p); 850 } 851 852 /* 853 * procfs vnode operations. 854 */ 855 int (**procfs_vnodeop_p)(); 856 struct vnodeopv_entry_desc procfs_vnodeop_entries[] = { 857 { &vop_default_desc, vn_default_error }, 858 { &vop_lookup_desc, procfs_lookup }, /* lookup */ 859 { &vop_create_desc, procfs_create }, /* create */ 860 { &vop_mknod_desc, procfs_mknod }, /* mknod */ 861 { &vop_open_desc, procfs_open }, /* open */ 862 { &vop_close_desc, procfs_close }, /* close */ 863 { &vop_access_desc, procfs_access }, /* access */ 864 { &vop_getattr_desc, procfs_getattr }, /* getattr */ 865 { &vop_setattr_desc, procfs_setattr }, /* setattr */ 866 { &vop_read_desc, procfs_read }, /* read */ 867 { &vop_write_desc, procfs_write }, /* write */ 868 { &vop_ioctl_desc, procfs_ioctl }, /* ioctl */ 869 { &vop_select_desc, procfs_select }, /* select */ 870 { &vop_mmap_desc, procfs_mmap }, /* mmap */ 871 { &vop_revoke_desc, procfs_revoke }, /* revoke */ 872 { &vop_fsync_desc, procfs_fsync }, /* fsync */ 873 { &vop_seek_desc, procfs_seek }, /* seek */ 874 { &vop_remove_desc, procfs_remove }, /* remove */ 875 { &vop_link_desc, procfs_link }, /* link */ 876 { &vop_rename_desc, procfs_rename }, /* rename */ 877 { &vop_mkdir_desc, procfs_mkdir }, /* mkdir */ 878 { &vop_rmdir_desc, procfs_rmdir }, /* rmdir */ 879 { &vop_symlink_desc, procfs_symlink }, /* symlink */ 880 { &vop_readdir_desc, procfs_readdir }, /* readdir */ 881 { &vop_readlink_desc, procfs_readlink }, /* readlink */ 882 { &vop_abortop_desc, procfs_abortop }, /* abortop */ 883 { &vop_inactive_desc, procfs_inactive }, /* inactive */ 884 { &vop_reclaim_desc, procfs_reclaim }, /* reclaim */ 885 { &vop_lock_desc, procfs_lock }, /* lock */ 886 { &vop_unlock_desc, procfs_unlock }, /* unlock */ 887 { &vop_bmap_desc, procfs_bmap }, /* bmap */ 888 { &vop_strategy_desc, procfs_strategy }, /* strategy */ 889 { &vop_print_desc, procfs_print }, /* print */ 890 { &vop_islocked_desc, procfs_islocked }, /* islocked */ 891 { &vop_pathconf_desc, procfs_pathconf }, /* pathconf */ 892 { &vop_advlock_desc, procfs_advlock }, /* advlock */ 893 { &vop_blkatoff_desc, procfs_blkatoff }, /* blkatoff */ 894 { &vop_valloc_desc, procfs_valloc }, /* valloc */ 895 { &vop_vfree_desc, procfs_vfree }, /* vfree */ 896 { &vop_truncate_desc, procfs_truncate }, /* truncate */ 897 { &vop_update_desc, procfs_update }, /* update */ 898 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 899 }; 900 struct vnodeopv_desc procfs_vnodeop_opv_desc = 901 { &procfs_vnodeop_p, procfs_vnodeop_entries }; 902