bin/ps/ps.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1990, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)ps.c     8.4 (Berkeley) 4/2/94
  31  * $FreeBSD: src/bin/ps/ps.c,v 1.30.2.6 2002/07/04 08:30:37 sobomax Exp $
  32  */
  33
  34 #include <sys/user.h>
  35 #include <sys/param.h>
  36 #include <sys/time.h>
  37 #include <sys/queue.h>
  38 #include <sys/resource.h>
  39 #include <sys/stat.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/mount.h>
  43
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <kvm.h>
  49 #include <limits.h>
  50 #include <locale.h>
  51 #include <nlist.h>
  52 #include <paths.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57 #include <pwd.h>
  58
  59 #include "ps.h"
  60
  61 #define SEP ", \t"              /* username separators */
  62
  63 #define KHSIZE  2048
  64 #define KHMASK  (KHSIZE - 1)
  65
  66 KINFO *KInfo;
  67 KINFO **KSort;
  68 struct varent *vhead, *vtail;
  69
  70 int     eval;                   /* exit value */
  71 int     cflag;                  /* -c */
  72 int     rawcpu;                 /* -C */
  73 int     sumrusage;              /* -S */
  74 int     termwidth;              /* width of screen (0 == infinity) */
  75 int     totwidth;               /* calculated width of requested variables */
  76 int     numcpus;                /* hw.ncpu */
  77 int     showtid;                /* -H */
  78
  79 static int needuser, needcomm, needenv;
  80 #if defined(LAZY_PS)
  81 static int forceuread=0;
  82 #define PS_ARGS "AaCcefgHhjLlM:mN:O:o:p:rRSTt:U:uvwx"
  83 #else
  84 static int forceuread=1;
  85 #define PS_ARGS "AaCcegHhjLlM:mN:O:o:p:rRSTt:U:uvwx"
  86 #endif
  87
  88 enum sort { DEFAULT, SORTMEM, SORTCPU } sortby = DEFAULT;
  89
  90 static const char *getfmt (char **(*)(kvm_t *, const struct kinfo_proc *, int),
  91                     KINFO *, char *, int);
  92 static char     *kludge_oldps_options (char *);
  93 static int       pscomp (const void *, const void *);
  94 static void      dochain (KINFO **ksort, int *nentriesp, pid_t pid);
  95 static void      saveuser (KINFO *);
  96 static void      scanvars (void);
  97 static void      dynsizevars (KINFO *);
  98 static void      sizevars (void);
  99 static int       check_procfs(void);
 100 static void      usage (void);
 101 static uid_t    *getuids(const char *, int *);
 102
 103 struct timeval btime;
 104
 105 static char dfmt[] = "pid tt state time command";
 106 static char jfmt[] = "user pid ppid pgid sess jobc state tt time command";
 107 static char lfmt[] = "uid pid ppid cpu pri nice vsz rss wchan state tt time command";
 108 static char   o1[] = "pid";
 109 static char   o2[] = "tt state time command";
 110 static char ufmt[] = "user pid %cpu %mem vsz rss tt state start time command";
 111 static char vfmt[] = "pid state time sl re pagein vsz rss lim tsiz %cpu %mem command";
 112
 113 kvm_t *kd;
 114
 115 int
 116 main(int argc, char **argv)
 117 {
 118         struct kinfo_proc *kp;
 119         struct varent *vent;
 120         struct winsize ws;
 121         dev_t ttydev;
 122         pid_t pid;
 123         uid_t *uids;
 124         int all, ch, flag, i, fmt, ofmt, lineno, nentries, nocludge, dropgid;
 125         int prtheader, wflag, what, xflg, uid, nuids;
 126         int chainflg;
 127         char errbuf[_POSIX2_LINE_MAX];
 128         const char *cp, *nlistf, *memf;
 129         size_t btime_size = sizeof(struct timeval);
 130         size_t numcpus_size = sizeof(numcpus);
 131
 132         setlocale(LC_ALL, "");
 133
 134         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&ws) == -1 &&
 135              ioctl(STDERR_FILENO, TIOCGWINSZ, (char *)&ws) == -1 &&
 136              ioctl(STDIN_FILENO,  TIOCGWINSZ, (char *)&ws) == -1) ||
 137              ws.ws_col == 0)
 138                 termwidth = 79;
 139         else
 140                 termwidth = ws.ws_col - 1;
 141
 142         /*
 143          * Don't apply a kludge if the first argument is an option taking an
 144          * argument
 145          */
 146         if (argc > 1) {
 147                 nocludge = 0;
 148                 if (argv[1][0] == '-') {
 149                         for (cp = PS_ARGS; *cp != '\0'; cp++) {
 150                                 if (*cp != ':')
 151                                         continue;
 152                                 if (*(cp - 1) == argv[1][1]) {
 153                                         nocludge = 1;
 154                                         break;
 155                                 }
 156                         }
 157                 }
 158                 if (nocludge == 0)
 159                         argv[1] = kludge_oldps_options(argv[1]);
 160         }
 161
 162         all = fmt = ofmt = prtheader = wflag = xflg = showtid = 0;
 163         chainflg = 0;
 164         pid = -1;
 165         nuids = 0;
 166         uids = NULL;
 167         ttydev = NODEV;
 168         dropgid = 0;
 169         memf = nlistf = _PATH_DEVNULL;
 170
 171         while ((ch = getopt(argc, argv, PS_ARGS)) != -1) {
 172                 switch((char)ch) {
 173                 case 'A':
 174                         all = xflg = 1;
 175                         break;
 176                 case 'a':
 177                         all = 1;
 178                         break;
 179                 case 'C':
 180                         rawcpu = 1;
 181                         break;
 182                 case 'c':
 183                         cflag = 1;
 184                         break;
 185                 case 'e':                       /* XXX set ufmt */
 186                         needenv = 1;
 187                         break;
 188                 case 'g':
 189                         break;                  /* no-op */
 190                 case 'H':
 191                         showtid = KERN_PROC_FLAG_LWP;
 192                         break;
 193                 case 'h':
 194                         prtheader = ws.ws_row > 5 ? ws.ws_row : 22;
 195                         break;
 196                 case 'j':
 197                         parsefmt(jfmt);
 198                         fmt = 1;
 199                         jfmt[0] = '\0';
 200                         break;
 201                 case 'L':
 202                         showkey();
 203                         exit(0);
 204                 case 'l':
 205                         parsefmt(lfmt);
 206                         fmt = 1;
 207                         lfmt[0] = '\0';
 208                         break;
 209                 case 'M':
 210                         memf = optarg;
 211                         dropgid = 1;
 212                         break;
 213                 case 'm':
 214                         sortby = SORTMEM;
 215                         break;
 216                 case 'N':
 217                         nlistf = optarg;
 218                         dropgid = 1;
 219                         break;
 220                 case 'O':
 221                         parsefmt(o1);
 222                         parsefmt(optarg);
 223                         parsefmt(o2);
 224                         o1[0] = o2[0] = '\0';
 225                         fmt = 1;
 226                         break;
 227                 case 'o':
 228                         parsefmt(optarg);
 229                         fmt = ofmt = 1;
 230                         break;
 231 #if defined(LAZY_PS)
 232                 case 'f':
 233                         if (getuid() == 0 || getgid() == 0)
 234                             forceuread = 1;
 235                         break;
 236 #endif
 237                 case 'p':
 238                         pid = atol(optarg);
 239                         xflg = 1;
 240                         break;
 241                 case 'r':
 242                         sortby = SORTCPU;
 243                         break;
 244                 case 'R':
 245                         chainflg = 1;
 246                         break;
 247                 case 'S':
 248                         sumrusage = 1;
 249                         break;
 250                 case 'T':
 251                         if ((optarg = ttyname(STDIN_FILENO)) == NULL)
 252                                 errx(1, "stdin: not a terminal");
 253                         /* FALLTHROUGH */
 254                 case 't': {
 255                         struct stat sb;
 256                         char pathbuf[PATH_MAX];
 257                         const char *ttypath;
 258
 259                         if (strcmp(optarg, "co") == 0) {
 260                                 ttypath = _PATH_CONSOLE;
 261                         } else if (*optarg >= '0' && *optarg <= '9') {
 262                                 snprintf(pathbuf, sizeof(pathbuf),
 263                                          "%spts/%s", _PATH_DEV, optarg);
 264                                 ttypath = pathbuf;
 265                         } else if (*optarg != '/') {
 266                                 snprintf(pathbuf, sizeof(pathbuf),
 267                                          "%s%s", _PATH_TTY, optarg);
 268                                 ttypath = pathbuf;
 269                         } else {
 270                                 ttypath = optarg;
 271                         }
 272                         if (stat(ttypath, &sb) == -1)
 273                                 err(1, "%s", ttypath);
 274                         if (!S_ISCHR(sb.st_mode))
 275                                 errx(1, "%s: not a terminal", ttypath);
 276                         ttydev = sb.st_rdev;
 277                         break;
 278                 }
 279                 case 'U':
 280                         uids = getuids(optarg, &nuids);
 281                         xflg++;         /* XXX: intuitive? */
 282                         break;
 283                 case 'u':
 284                         parsefmt(ufmt);
 285                         sortby = SORTCPU;
 286                         fmt = 1;
 287                         ufmt[0] = '\0';
 288                         break;
 289                 case 'v':
 290                         parsefmt(vfmt);
 291                         sortby = SORTMEM;
 292                         fmt = 1;
 293                         vfmt[0] = '\0';
 294                         break;
 295                 case 'w':
 296                         if (wflag)
 297                                 termwidth = UNLIMITED;
 298                         else if (termwidth < 131)
 299                                 termwidth = 131;
 300                         wflag++;
 301                         break;
 302                 case 'x':
 303                         xflg = 1;
 304                         break;
 305                 case '?':
 306                 default:
 307                         usage();
 308                 }
 309         }
 310         argc -= optind;
 311         argv += optind;
 312
 313         /*
 314          * If the user specified ps -e then they want a copy of the process
 315          * environment kvm_getenvv(3) attempts to open /proc/<pid>/mem.
 316          * Check to make sure that procfs is mounted on /proc, otherwise
 317          * print a warning informing the user that output will be incomplete.
 318          */
 319         if (needenv == 1 && check_procfs() == 0)
 320                 warnx("Process environment requires procfs(5)");
 321
 322 #define BACKWARD_COMPATIBILITY
 323 #ifdef  BACKWARD_COMPATIBILITY
 324         if (*argv) {
 325                 nlistf = *argv;
 326                 if (*++argv) {
 327                         memf = *argv;
 328                 }
 329         }
 330 #endif
 331         /*
 332          * Discard setgid privileges if not the running kernel so that bad
 333          * guys can't print interesting stuff from kernel memory.
 334          */
 335         if (dropgid) {
 336                 setgid(getgid());
 337                 setuid(getuid());
 338         }
 339
 340         kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
 341         if (kd == NULL)
 342                 errx(1, "%s", errbuf);
 343
 344         if (!fmt)
 345                 parsefmt(dfmt);
 346
 347         /*
 348          * Add TID to output format if requested unless user-specific format
 349          * selected.
 350          */
 351         if (showtid && !ofmt)
 352                 insert_tid_in_fmt();
 353
 354         /* XXX - should be cleaner */
 355         if (!all && ttydev == NODEV && pid == -1 && !nuids) {
 356                 if ((uids = malloc(sizeof (*uids))) == NULL)
 357                         errx(1, "malloc: %s", strerror(errno));
 358                 nuids = 1;
 359                 *uids = getuid();
 360         }
 361
 362         /*
 363          * scan requested variables, noting what structures are needed,
 364          * and adjusting header widths as appropriate.
 365          */
 366         scanvars();
 367
 368         /*
 369          * Get boot time
 370          */
 371         if (sysctlbyname("kern.boottime", &btime, &btime_size, NULL, 0) < 0) {
 372                 perror("sysctl: kern.boottime");
 373                 exit(EXIT_FAILURE);
 374         }
 375
 376         /*
 377          * Get number of cpus
 378          */
 379         if (sysctlbyname("hw.ncpu", &numcpus, &numcpus_size, NULL, 0) < 0)
 380                 numcpus = 1;
 381
 382         /*
 383          * get proc list
 384          */
 385         if (nuids == 1) {
 386                 what = KERN_PROC_UID;
 387                 flag = *uids;
 388         } else if (ttydev != NODEV) {
 389                 what = KERN_PROC_TTY;
 390                 flag = ttydev;
 391         } else if (pid != -1 && chainflg == 0) {
 392                 what = KERN_PROC_PID;
 393                 flag = pid;
 394         } else {
 395                 what = KERN_PROC_ALL;
 396                 flag = 0;
 397         }
 398         what |= showtid;
 399
 400         /*
 401          * select procs
 402          */
 403         if ((kp = kvm_getprocs(kd, what, flag, &nentries)) == NULL)
 404                 errx(1, "%s", kvm_geterr(kd));
 405         if ((KInfo = calloc(nentries, sizeof(KINFO))) == NULL)
 406                 err(1, NULL);
 407         if ((KSort = malloc(nentries * sizeof(KINFO *))) == NULL)
 408                 err(1, NULL);
 409
 410         for (i = 0; i < nentries; ++i) {
 411                 KInfo[i].ki_proc = &kp[i];
 412                 KInfo[i].ki_indent = -1;
 413                 KInfo[i].ki_ctailp = &KInfo[i].ki_cbase;
 414                 if (needuser)
 415                         saveuser(&KInfo[i]);
 416                 dynsizevars(&KInfo[i]);
 417                 KSort[i] = &KInfo[i];
 418         }
 419
 420         sizevars();
 421
 422         /*
 423          * print header
 424          */
 425         printheader();
 426         if (nentries == 0)
 427                 exit(1);
 428         /*
 429          * sort proc list
 430          */
 431         qsort(KSort, nentries, sizeof(KINFO *), pscomp);
 432
 433         /*
 434          * rejigger and indent children, parent(s) and children
 435          * at each level retain the above sort characteristics.
 436          */
 437         if (chainflg)
 438                 dochain(KSort, &nentries, pid);
 439
 440         /*
 441          * for each proc, call each variable output function.
 442          */
 443         for (i = lineno = 0; i < nentries; i++) {
 444                 if (xflg == 0 && (KI_PROC(KSort[i], tdev) == NODEV ||
 445                     (KI_PROC(KSort[i], flags) & P_CONTROLT ) == 0))
 446                         continue;
 447                 if (nuids > 1) {
 448                         for (uid = 0; uid < nuids; uid++)
 449                                 if (KI_PROC(KSort[i], uid) ==
 450                                     uids[uid])
 451                                         break;
 452                         if (uid == nuids)
 453                                 continue;
 454                 }
 455                 STAILQ_FOREACH(vent, &var_head, link) {
 456                         (vent->var->oproc)(KSort[i], vent);
 457                         if (STAILQ_NEXT(vent, link) != NULL)
 458                                 putchar(' ');
 459                 }
 460                 putchar('\n');
 461                 if (prtheader && lineno++ == prtheader - 4) {
 462                         putchar('\n');
 463                         printheader();
 464                         lineno = 0;
 465                 }
 466         }
 467         free(uids);
 468
 469         exit(eval);
 470 }
 471
 472 uid_t *
 473 getuids(const char *arg, int *nuids)
 474 {
 475         char name[MAXLOGNAME];
 476         struct passwd *pwd;
 477         uid_t *uids, *moreuids;
 478         size_t l;
 479         int alloc;
 480
 481
 482         alloc = 0;
 483         *nuids = 0;
 484         uids = NULL;
 485         for (; (l = strcspn(arg, SEP)) > 0; arg += l + strspn(arg + l, SEP)) {
 486                 if (l >= sizeof name) {
 487                         warnx("%.*s: name too long", (int)l, arg);
 488                         continue;
 489                 }
 490                 strncpy(name, arg, l);
 491                 name[l] = '\0';
 492                 if ((pwd = getpwnam(name)) == NULL) {
 493                         warnx("%s: no such user", name);
 494                         continue;
 495                 }
 496                 if (*nuids >= alloc) {
 497                         alloc = (alloc + 1) << 1;
 498                         moreuids = realloc(uids, alloc * sizeof (*uids));
 499                         if (moreuids == NULL) {
 500                                 free(uids);
 501                                 errx(1, "realloc: %s", strerror(errno));
 502                         }
 503                         uids = moreuids;
 504                 }
 505                 uids[(*nuids)++] = pwd->pw_uid;
 506         }
 507         endpwent();
 508
 509         if (!*nuids)
 510                 errx(1, "No users specified");
 511
 512         return uids;
 513 }
 514
 515 static void
 516 scanvars(void)
 517 {
 518         struct varent *vent;
 519         const VAR *v;
 520
 521         STAILQ_FOREACH(vent, &var_head, link) {
 522                 v = vent->var;
 523                 if (v->flag & DSIZ) {
 524                         vent->dwidth = vent->width;
 525                         vent->width = 0;
 526                 }
 527                 if (v->flag & USER)
 528                         needuser = 1;
 529                 if (v->flag & COMM)
 530                         needcomm = 1;
 531         }
 532 }
 533
 534 static void
 535 dynsizevars(KINFO *ki)
 536 {
 537         struct varent *vent;
 538         const VAR *v;
 539         int i;
 540
 541         STAILQ_FOREACH(vent, &var_head, link) {
 542                 v = vent->var;
 543                 if (!(v->flag & DSIZ))
 544                         continue;
 545                 i = (v->sproc)( ki);
 546                 if (vent->width < i)
 547                         vent->width = i;
 548                 if (vent->width > vent->dwidth)
 549                         vent->width = vent->dwidth;
 550         }
 551 }
 552
 553 static void
 554 sizevars(void)
 555 {
 556         struct varent *vent;
 557         int i;
 558
 559         STAILQ_FOREACH(vent, &var_head, link) {
 560                 i = strlen(vent->header);
 561                 if (vent->width < i)
 562                         vent->width = i;
 563                 totwidth += vent->width + 1;    /* +1 for space */
 564         }
 565         totwidth--;
 566 }
 567
 568 static const char *
 569 getfmt(char **(*fn) (kvm_t *, const struct kinfo_proc *, int), KINFO *ki, char
 570     *comm, int maxlen)
 571 {
 572         const char *s;
 573
 574         if ((s =
 575             fmt_argv((*fn)(kd, ki->ki_proc, termwidth), comm, maxlen)) == NULL)
 576                 err(1, NULL);
 577         return (s);
 578 }
 579
 580 static void
 581 saveuser(KINFO *ki)
 582 {
 583         /*
 584          * save arguments if needed
 585          */
 586         if (needcomm) {
 587                 ki->ki_args = getfmt(kvm_getargv, ki, KI_PROC(ki, comm),
 588                     MAXCOMLEN);
 589         } else {
 590                 ki->ki_args = NULL;
 591         }
 592         if (needenv) {
 593                 ki->ki_env = getfmt(kvm_getenvv, ki, NULL, 0);
 594         } else {
 595                 ki->ki_env = NULL;
 596         }
 597 }
 598
 599 static int
 600 pscomp(const void *arg_a, const void *arg_b)
 601 {
 602         const KINFO *a = *(KINFO * const *)arg_a;
 603         const KINFO *b = *(KINFO * const *)arg_b;
 604         double di;
 605         segsz_t si;
 606         int i;
 607
 608 #define VSIZE(k) (KI_PROC(k, vm_dsize) + KI_PROC(k, vm_ssize) + \
 609                   KI_PROC(k, vm_tsize))
 610
 611 #if 0
 612         if (sortby == SORTIAC)
 613                 return (KI_PROC(a)->p_usdata.bsd4.interactive - KI_PROC(b)->p_usdata.bsd4.interactive);
 614 #endif
 615         if (sortby == SORTCPU) {
 616                 di = getpcpu(b) - getpcpu(a);
 617                 if (di < 0.0)
 618                         return(-1);
 619                 if (di > 0.0)
 620                         return(+1);
 621                 /* fall through */
 622         }
 623         if (sortby == SORTMEM) {
 624                 si = VSIZE(b) - VSIZE(a);
 625                 if (si < 0)
 626                         return(-1);
 627                 if (si > 0)
 628                         return(+1);
 629                 /* fall through */
 630         }
 631         i = KI_PROC(a, tdev) - KI_PROC(b, tdev);
 632         if (i == 0)
 633                 i = KI_PROC(a, pid) - KI_PROC(b, pid);
 634         return (i);
 635 }
 636
 637 /*
 638  * Chain (-R) option.  Sub-sorts by parent/child association.
 639  */
 640 static int dochain_final(KINFO **kfinal, KINFO *base, int j);
 641
 642 static void
 643 dochain (KINFO **ksort, int *nentriesp, pid_t pid)
 644 {
 645         int nentries = *nentriesp;
 646         int i;
 647         int j;
 648         int hi;
 649         pid_t ppid;
 650         KINFO *scan;
 651         KINFO **khash;
 652         KINFO **kfinal;
 653
 654         /*
 655          * First hash all the pids so we can quickly locate the
 656          * parent pids.
 657          */
 658         khash = calloc(KHSIZE, sizeof(KINFO *));
 659         kfinal = calloc(nentries, sizeof(KINFO *));
 660
 661         for (i = 0; i < nentries; ++i) {
 662                 hi = KI_PROC(ksort[i], pid) & KHMASK;
 663
 664                 ksort[i]->ki_hnext = khash[hi];
 665                 khash[hi] = ksort[i];
 666         }
 667
 668         /*
 669          * Now run through the list and create the parent associations.
 670          */
 671         for (i = 0; i < nentries; ++i) {
 672                 ppid = KI_PROC(ksort[i], ppid);
 673
 674                 if (ppid <= 0 || KI_PROC(ksort[i], pid) <= 0) {
 675                         scan = NULL;
 676                 } else {
 677                         for (scan = khash[ppid & KHMASK];
 678                              scan;
 679                              scan = scan->ki_hnext) {
 680                                 if (ppid == KI_PROC(scan, pid))
 681                                         break;
 682                         }
 683                 }
 684                 if (scan) {
 685                         ksort[i]->ki_parent = scan;
 686                         *scan->ki_ctailp = ksort[i];
 687                         scan->ki_ctailp = &ksort[i]->ki_cnext;
 688                 }
 689         }
 690
 691         /*
 692          * Now regenerate the list starting at root entries, then copyback.
 693          */
 694         for (i = j = 0; i < nentries; ++i) {
 695                 if (pid != (pid_t)-1) {
 696                         if (KI_PROC(ksort[i], pid) == pid) {
 697                                 ksort[i]->ki_indent = 0;
 698                                 j = dochain_final(kfinal, ksort[i], j);
 699                         }
 700                 } else if (ksort[i]->ki_parent == NULL) {
 701                         ksort[i]->ki_indent = 0;
 702                         j = dochain_final(kfinal, ksort[i], j);
 703                 }
 704         }
 705
 706         /*
 707          * There might be fewer entries if we restricted the chain to a
 708          * pid.
 709          */
 710         nentries = j;
 711         *nentriesp = nentries;
 712
 713         if (nentries)
 714                 bcopy(kfinal, ksort, nentries * sizeof(kfinal[0]));
 715         free(kfinal);
 716         free(khash);
 717 }
 718
 719 static int
 720 dochain_final(KINFO **kfinal, KINFO *base, int j)
 721 {
 722         KINFO *scan;
 723
 724         kfinal[j++] = base;
 725         for (scan = base->ki_cbase; scan; scan = scan->ki_cnext) {
 726                 /*
 727                  * Don't let us loop
 728                  */
 729                 if (scan->ki_indent >= 0)
 730                         continue;
 731                 scan->ki_indent = base->ki_indent + 1;
 732                 j = dochain_final(kfinal, scan, j);
 733         }
 734         return (j);
 735 }
 736
 737 /*
 738  * ICK (all for getopt), would rather hide the ugliness
 739  * here than taint the main code.
 740  *
 741  *  ps foo -> ps -foo
 742  *  ps 34 -> ps -p34
 743  *
 744  * The old convention that 't' with no trailing tty arg means the users
 745  * tty, is only supported if argv[1] doesn't begin with a '-'.  This same
 746  * feature is available with the option 'T', which takes no argument.
 747  */
 748 static char *
 749 kludge_oldps_options(char *s)
 750 {
 751         size_t len;
 752         char *newopts, *ns, *cp;
 753
 754         len = strlen(s);
 755         if ((newopts = ns = malloc(len + 2)) == NULL)
 756                 err(1, NULL);
 757         /*
 758          * options begin with '-'
 759          */
 760         if (*s != '-')
 761                 *ns++ = '-';    /* add option flag */
 762
 763         /*
 764          * gaze to end of argv[1]
 765          */
 766         cp = s + len - 1;
 767
 768         /*
 769          * if last letter is a 't' flag with no argument (in the context
 770          * of the oldps options -- option string NOT starting with a '-' --
 771          * then convert to 'T' (meaning *this* terminal, i.e. ttyname(0)).
 772          *
 773          * However, if a flag accepting a string argument is found in the
 774          * option string, the remainder of the string is the argument to
 775          * that flag; do not modify that argument.
 776          */
 777         if (strcspn(s, "MNOoU") == len && *cp == 't' && *s != '-') {
 778                 *cp = 'T';
 779         } else {
 780                 /*
 781                  * otherwise check for trailing number, which *may* be a
 782                  * pid.
 783                  */
 784                 while (cp >= s && isdigit(*cp))
 785                         --cp;
 786         }
 787         cp++;
 788         memmove(ns, s, (size_t)(cp - s));       /* copy up to trailing number */
 789         ns += cp - s;
 790         /*
 791          * if there's a trailing number, and not a preceding 'p' (pid) or
 792          * 't' (tty) flag, then assume it's a pid and insert a 'p' flag.
 793          */
 794         if (isdigit(*cp) &&
 795             (cp == s || (cp[-1] != 't' && cp[-1] != 'p')) &&
 796             (cp - 1 == s || cp[-2] != 't')) {
 797                 *ns++ = 'p';
 798         }
 799         strcpy(ns, cp);         /* and append the number */
 800
 801         return (newopts);
 802 }
 803
 804 static int
 805 check_procfs(void)
 806 {
 807         struct statfs mnt;
 808
 809         if (statfs("/proc", &mnt) < 0)
 810                 return (0);
 811         if (strcmp(mnt.f_fstypename, "procfs") != 0)
 812                 return (0);
 813         return (1);
 814 }
 815
 816 static void
 817 usage(void)
 818 {
 819
 820         fprintf(stderr, "%s\n%s\n%s\n",
 821             "usage: ps [-aCcefhHjlmrSTuvwx] [-M core] [-N system] [-O fmt] [-o fmt] [-p pid]",
 822             "          [-t tty] [-U username]",
 823             "       ps [-L]");
 824         exit(1);
 825 }