usr.bin/limits/limits.c

   1 /*-
   2  * Copyright (c) 1997 by
   3  * David L. Nugent <davidn@blaze.net.au>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, is permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice immediately at the beginning of the file, without modification,
  11  *    this list of conditions, and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. This work was done expressly for inclusion into FreeBSD.  Other use
  16  *    is permitted provided this notation is included.
  17  * 4. Absolutely no warranty of function or purpose is made by the authors.
  18  * 5. Modifications may be freely made to this file providing the above
  19  *    conditions are met.
  20  *
  21  * Display/change(+runprogram)/eval resource limits.
  22  *
  23  * $FreeBSD: src/usr.bin/limits/limits.c,v 1.7.2.3 2003/05/22 09:26:57 sheldonh Exp $
  24  */
  25
  26 #include <err.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <sys/param.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <stdarg.h>
  35 #include <ctype.h>
  36 #include <errno.h>
  37 #include <pwd.h>
  38 #include <login_cap.h>
  39 #include <sys/time.h>
  40 #include <sys/resource.h>
  41
  42 enum
  43 {
  44     SH_NONE,
  45     SH_SH,      /* sh */
  46     SH_CSH,     /* csh */
  47     SH_BASH,    /* gnu bash */
  48     SH_TCSH,    /* tcsh */
  49     SH_KSH,     /* (pd)ksh */
  50     SH_ZSH,     /* zsh */
  51     SH_RC,      /* rc or es */
  52     SH_NUMBER
  53 };
  54
  55
  56 /* eval emitter for popular shells.
  57  * Why aren't there any standards here? Most shells support either
  58  * the csh 'limit' or sh 'ulimit' command, but each varies just
  59  * enough that they aren't very compatible from one to the other.
  60  */
  61 static struct {
  62     const char * name;      /* Name of shell */
  63     const char * inf;       /* Name used for 'unlimited' resource */
  64     const char * cmd;       /* Intro text */
  65     const char * hard;      /* Hard limit text */
  66     const char * soft;      /* Soft limit text */
  67     const char * both;      /* Hard+Soft limit text */
  68     struct {
  69         const char * pfx;
  70         const char * sfx;
  71         int divisor;
  72     } lprm[RLIM_NLIMITS];
  73 } shellparm[] =
  74 {
  75     { "", "infinity", "Resource limits%s%s:\n", "-max", "-cur", "",
  76       {
  77           { "  cputime%-4s      %8s", " secs\n",  1    },
  78           { "  filesize%-4s     %8s", " kb\n",    1024 },
  79           { "  datasize%-4s     %8s", " kb\n",    1024 },
  80           { "  stacksize%-4s    %8s", " kb\n",    1024 },
  81           { "  coredumpsize%-4s %8s", " kb\n",    1024 },
  82           { "  memoryuse%-4s    %8s", " kb\n",    1024 },
  83           { "  memorylocked%-4s %8s", " kb\n",    1024 },
  84           { "  maxprocesses%-4s %8s", "\n",       1    },
  85           { "  openfiles%-4s    %8s", "\n",       1    },
  86           { "  sbsize%-4s       %8s", " bytes\n", 1    },
  87           { "  vmemoryuse%-4s   %8s", " kb\n",    1024 },
  88 #ifdef RLIMIT_POSIXLOCKS
  89           { "  posixlocks%-4s   %8s", "\n",       1    },
  90 #endif
  91       }
  92     },
  93     { "sh", "unlimited", "", " -H", " -S", "",
  94       {
  95           { "ulimit%s -t %s", ";\n",  1    },
  96           { "ulimit%s -f %s", ";\n",  512  },
  97           { "ulimit%s -d %s", ";\n",  1024 },
  98           { "ulimit%s -s %s", ";\n",  1024 },
  99           { "ulimit%s -c %s", ";\n",  512  },
 100           { "ulimit%s -m %s", ";\n",  1024 },
 101           { "ulimit%s -l %s", ";\n",  1024 },
 102           { "ulimit%s -u %s", ";\n",  1    },
 103           { "ulimit%s -n %s", ";\n",  1    },
 104           { "ulimit%s -b %s", ";\n",  1    },
 105           { "ulimit%s -v %s", ";\n",  1024 },
 106 #ifdef RLIMIT_POSIXLOCKS
 107           { "ulimit%s -k %s", ";\n",  1    },
 108 #endif
 109       }
 110     },
 111     { "csh", "unlimited", "", " -h", "", NULL,
 112       {
 113           { "limit%s cputime %s",      ";\n",  1    },
 114           { "limit%s filesize %s",     ";\n",  1024 },
 115           { "limit%s datasize %s",     ";\n",  1024 },
 116           { "limit%s stacksize %s",    ";\n",  1024 },
 117           { "limit%s coredumpsize %s", ";\n",  1024 },
 118           { "limit%s memoryuse %s",    ";\n",  1024 },
 119           { "limit%s memorylocked %s", ";\n",  1024 },
 120           { "limit%s maxproc %s",      ";\n",  1    },
 121           { "limit%s openfiles %s",    ";\n",  1    },
 122           { "limit%s sbsize %s",       ";\n",  1    },
 123           { "limit%s vmemoryuse %s",   ";\n",  1024 },
 124 #ifdef RLIMIT_POSIXLOCKS
 125           { "limit%s advlocks %s",     ";\n",  1    },
 126 #endif
 127       }
 128     },
 129     { "bash|bash2", "unlimited", "", " -H", " -S", "",
 130       {
 131           { "ulimit%s -t %s", ";\n",  1    },
 132           { "ulimit%s -f %s", ";\n",  1024 },
 133           { "ulimit%s -d %s", ";\n",  1024 },
 134           { "ulimit%s -s %s", ";\n",  1024 },
 135           { "ulimit%s -c %s", ";\n",  1024 },
 136           { "ulimit%s -m %s", ";\n",  1024 },
 137           { "ulimit%s -l %s", ";\n",  1024 },
 138           { "ulimit%s -u %s", ";\n",  1    },
 139           { "ulimit%s -n %s", ";\n",  1    },
 140           { "ulimit%s -b %s", ";\n",  1    },
 141           { "ulimit%s -v %s", ";\n",  1024 },
 142 #ifdef RLIMIT_POSIXLOCKS
 143           { "ulimit%s -k %s", ";\n",  1    },
 144 #endif
 145       }
 146     },
 147     { "tcsh", "unlimited", "", " -h", "", NULL,
 148       {
 149           { "limit%s cputime %s",      ";\n",  1    },
 150           { "limit%s filesize %s",     ";\n",  1024 },
 151           { "limit%s datasize %s",     ";\n",  1024 },
 152           { "limit%s stacksize %s",    ";\n",  1024 },
 153           { "limit%s coredumpsize %s", ";\n",  1024 },
 154           { "limit%s memoryuse %s",    ";\n",  1024 },
 155           { "limit%s memorylocked %s", ";\n",  1024 },
 156           { "limit%s maxproc %s",      ";\n",  1    },
 157           { "limit%s descriptors %s",  ";\n",  1    },
 158           { "limit%s sbsize %s",       ";\n",  1    },
 159           { "limit%s vmemoryuse %s",   ";\n",  1024 },
 160 #ifdef RLIMIT_POSIXLOCKS
 161           { "limit%s advlocks %s",      ";\n",  1   },
 162 #endif
 163       }
 164     },
 165     { "ksh|pdksh", "unlimited", "", " -H", " -S", "",
 166       {
 167           { "ulimit%s -t %s", ";\n",  1    },
 168           { "ulimit%s -f %s", ";\n",  512  },
 169           { "ulimit%s -d %s", ";\n",  1024 },
 170           { "ulimit%s -s %s", ";\n",  1024 },
 171           { "ulimit%s -c %s", ";\n",  512  },
 172           { "ulimit%s -m %s", ";\n",  1024 },
 173           { "ulimit%s -l %s", ";\n",  1024 },
 174           { "ulimit%s -p %s", ";\n",  1    },
 175           { "ulimit%s -n %s", ";\n",  1    },
 176           { "ulimit%s -b %s", ";\n",  1    },
 177           { "ulimit%s -v %s", ";\n",  1024 },
 178 #ifdef RLIMIT_POSIXLOCKS
 179           { "ulimit%s -k %s", ";\n",  1    },
 180 #endif
 181       }
 182     },
 183     { "zsh", "unlimited", "", " -H", " -S", "",
 184       {
 185           { "ulimit%s -t %s", ";\n",  1    },
 186           { "ulimit%s -f %s", ";\n",  512  },
 187           { "ulimit%s -d %s", ";\n",  1024 },
 188           { "ulimit%s -s %s", ";\n",  1024 },
 189           { "ulimit%s -c %s", ";\n",  512  },
 190           { "ulimit%s -m %s", ";\n",  1024 },
 191           { "ulimit%s -l %s", ";\n",  1024 },
 192           { "ulimit%s -u %s", ";\n",  1    },
 193           { "ulimit%s -n %s", ";\n",  1    },
 194           { "ulimit%s -b %s", ";\n",  1    },
 195           { "ulimit%s -v %s", ";\n",  1024 },
 196 #ifdef RLIMIT_POSIXLOCKS
 197           { "ulimit%s -k %s", ";\n",  1    },
 198 #endif
 199       }
 200     },
 201     { "rc|es", "unlimited", "", " -h", "", NULL,
 202       {
 203           { "limit%s cputime %s",      ";\n",  1    },
 204           { "limit%s filesize %s",     ";\n",  1024 },
 205           { "limit%s datasize %s",     ";\n",  1024 },
 206           { "limit%s stacksize %s",    ";\n",  1024 },
 207           { "limit%s coredumpsize %s", ";\n",  1024 },
 208           { "limit%s memoryuse %s",    ";\n",  1024 },
 209           { "limit%s lockedmemory %s", ";\n",  1024 },
 210           { "limit%s processes %s",    ";\n",  1    },
 211           { "limit%s descriptors %s",  ";\n",  1    },
 212           { "limit%s sbsize %s",       ";\n",  1    },
 213           { "limit%s vmemoryuse %s",   ";\n",  1024 },
 214 #ifdef RLIMIT_POSIXLOCKS
 215           { "limit%s advlocks %s",     ";\n",  1    },
 216 #endif
 217       }
 218     },
 219     { NULL, NULL, NULL, NULL, NULL, NULL, {} }
 220 };
 221
 222 static struct {
 223     const char * cap;
 224     rlim_t (*func)(login_cap_t *, const char *, rlim_t, rlim_t);
 225 } resources[RLIM_NLIMITS] = {
 226     { "cputime",        login_getcaptime },
 227     { "filesize",       login_getcapsize },
 228     { "datasize",       login_getcapsize },
 229     { "stacksize",      login_getcapsize },
 230     { "coredumpsize",   login_getcapsize },
 231     { "memoryuse",      login_getcapsize },
 232     { "memorylocked",   login_getcapsize },
 233     { "maxproc",        login_getcapnum  },
 234     { "openfiles",      login_getcapnum  },
 235     { "sbsize",         login_getcapsize },
 236     { "vmemoryuse",     login_getcapsize },
 237     { "posixlocks",     login_getcapnum  },
 238 };
 239
 240 /*
 241  * One letter for each resource levels.
 242  * NOTE: There is a dependancy on the corresponding
 243  * letter index being equal to the resource number.
 244  * If sys/resource.h defines are changed, this needs
 245  * to be modified accordingly!
 246  */
 247
 248 #define RCS_STRING  "tfdscmlunbvk"
 249
 250 static rlim_t resource_num(int which, int ch, const char *str);
 251 static void usage(void);
 252 static int getshelltype(void);
 253 static void print_limit(rlim_t limit, unsigned divisor, const char *inf,
 254                         const char *pfx, const char *sfx, const char *which);
 255 extern char **environ;
 256
 257 static const char rcs_string[] = RCS_STRING;
 258
 259 int
 260 main(int argc, char *argv[])
 261 {
 262     char *p, *cls = NULL;
 263     char *cleanenv[1];
 264     struct passwd * pwd = NULL;
 265     int rcswhich, shelltype;
 266     int i, num_limits = 0;
 267     int ch, doeval = 0, doall = 0;
 268     login_cap_t * lc = NULL;
 269     enum { ANY=0, SOFT=1, HARD=2, BOTH=3, DISPLAYONLY=4 } type = ANY;
 270     enum { RCSUNKNOWN=0, RCSSET=1, RCSSEL=2 } todo = RCSUNKNOWN;
 271     int which_limits[RLIM_NLIMITS];
 272     rlim_t set_limits[RLIM_NLIMITS];
 273     struct rlimit limits[RLIM_NLIMITS];
 274
 275     /* init resource tables */
 276     for (i = 0; i < RLIM_NLIMITS; i++) {
 277         which_limits[i] = 0; /* Don't set/display any */
 278         set_limits[i] = RLIM_INFINITY;
 279         /* Get current resource values */
 280         if (getrlimit(i, &limits[i]) < 0) {
 281                 limits[i].rlim_cur = -1;
 282                 limits[i].rlim_max = -1;
 283         }
 284     }
 285
 286     optarg = NULL;
 287     while ((ch = getopt(argc, argv, ":EeC:U:BSHabc:d:f:k:l:m:n:s:t:u:v:")) != -1) {
 288         switch(ch) {
 289         case 'a':
 290             doall = 1;
 291             break;
 292         case 'E':
 293             environ = cleanenv;
 294             cleanenv[0] = NULL;
 295             break;
 296         case 'e':
 297             doeval = 1;
 298             break;
 299         case 'C':
 300             cls = optarg;
 301             break;
 302         case 'U':
 303             if ((pwd = getpwnam(optarg)) == NULL) {
 304                 if (!isdigit(*optarg) ||
 305                     (pwd = getpwuid(atoi(optarg))) == NULL) {
 306                     warnx("invalid user `%s'", optarg);
 307                     usage();
 308                 }
 309             }
 310             break;
 311         case 'H':
 312             type = HARD;
 313             break;
 314         case 'S':
 315             type = SOFT;
 316             break;
 317         case 'B':
 318             type = SOFT|HARD;
 319             break;
 320         default:
 321         case ':': /* Without arg */
 322             if ((p = strchr(rcs_string, optopt)) != NULL) {
 323                 rcswhich = p - rcs_string;
 324
 325                 /*
 326                  * Backwards compatibility with earlier kernel which might
 327                  * support fewer resources.
 328                  */
 329                 if (rcswhich >= RLIM_NLIMITS) {
 330                     usage();
 331                     break;
 332                 }
 333                 if (optarg && *optarg == '-') { /* 'arg' is actually a switch */
 334                     --optind;           /* back one arg, and make arg NULL */
 335                     optarg = NULL;
 336                 }
 337                 todo = optarg == NULL ? RCSSEL : RCSSET;
 338                 if (type == ANY)
 339                     type = BOTH;
 340                 which_limits[rcswhich] = optarg ? type : DISPLAYONLY;
 341                 set_limits[rcswhich] = resource_num(rcswhich, optopt, optarg);
 342                 num_limits++;
 343                 break;
 344             }
 345             /* FALLTHRU */
 346         case '?':
 347             usage();
 348         }
 349         optarg = NULL;
 350     }
 351
 352     /* If user was specified, get class from that */
 353     if (pwd != NULL)
 354         lc = login_getpwclass(pwd);
 355     else if (cls != NULL && *cls != '\0') {
 356         lc = login_getclassbyname(cls, NULL);
 357         if (lc == NULL || strcmp(cls, lc->lc_class) != 0)
 358             fprintf(stderr, "login class '%s' non-existent, using %s\n",
 359                     cls, lc?lc->lc_class:"current settings");
 360     }
 361
 362     /* If we have a login class, update resource table from that */
 363     if (lc != NULL) {
 364         for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
 365             char str[40];
 366             rlim_t val;
 367
 368             /* current value overridden by resourcename or resourcename-cur */
 369             sprintf(str, "%s-cur", resources[rcswhich].cap);
 370             val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_cur, limits[rcswhich].rlim_cur);
 371             limits[rcswhich].rlim_cur = resources[rcswhich].func(lc, str, val, val);
 372             /* maximum value overridden by resourcename or resourcename-max */
 373             sprintf(str, "%s-max", resources[rcswhich].cap);
 374             val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_max, limits[rcswhich].rlim_max);
 375             limits[rcswhich].rlim_max = resources[rcswhich].func(lc, str, val, val);
 376         }
 377     }
 378
 379     /* now, let's determine what we wish to do with all this */
 380
 381     argv += optind;
 382
 383     /* If we're setting limits or doing an eval (ie. we're not just
 384      * displaying), then check that hard limits are not lower than
 385      * soft limits, and force rasing the hard limit if we need to if
 386      * we are raising the soft limit, or lower the soft limit if we
 387      * are lowering the hard limit.
 388      */
 389     if ((*argv || doeval) && getuid() == 0) {
 390
 391         for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
 392             if (limits[rcswhich].rlim_max != RLIM_INFINITY) {
 393                 if (limits[rcswhich].rlim_cur == RLIM_INFINITY) {
 394                     limits[rcswhich].rlim_max = RLIM_INFINITY;
 395                     which_limits[rcswhich] |= HARD;
 396                 } else if (limits[rcswhich].rlim_cur > limits[rcswhich].rlim_max) {
 397                     if (which_limits[rcswhich] == SOFT) {
 398                         limits[rcswhich].rlim_max = limits[rcswhich].rlim_cur;
 399                         which_limits[rcswhich] |= HARD;
 400                     }  else if (which_limits[rcswhich] == HARD) {
 401                         limits[rcswhich].rlim_cur = limits[rcswhich].rlim_max;
 402                         which_limits[rcswhich] |= SOFT;
 403                     } else {
 404                         /* else.. if we're specifically setting both to
 405                          * silly values, then let it error out.
 406                          */
 407                     }
 408                 }
 409             }
 410         }
 411     }
 412
 413     /* See if we've overridden anything specific on the command line */
 414     if (num_limits && todo == RCSSET) {
 415         for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
 416             if (which_limits[rcswhich] & HARD)
 417                 limits[rcswhich].rlim_max = set_limits[rcswhich];
 418             if (which_limits[rcswhich] & SOFT)
 419                 limits[rcswhich].rlim_cur = set_limits[rcswhich];
 420         }
 421     }
 422
 423     /* If *argv is not NULL, then we are being asked to
 424      * (perhaps) set environment variables and run a program
 425      */
 426     if (*argv) {
 427         if (doeval) {
 428             warnx("-e cannot be used with `cmd' option");
 429             usage();
 430         }
 431
 432         login_close(lc);
 433
 434         /* set leading environment variables, like eval(1) */
 435         while (*argv && (p = strchr(*argv, '='))) {
 436             *p = '\0';
 437             if (setenv(*argv++, p + 1, 1) == -1)
 438                 err(1, "setenv: cannot set %s=%s", *argv, p + 1);
 439             *p = '=';
 440         }
 441
 442         /* Set limits */
 443         for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
 444             if (doall || num_limits == 0 || which_limits[rcswhich] != 0)
 445                 if (setrlimit(rcswhich, &limits[rcswhich]) == -1)
 446                     err(1, "setrlimit %s", resources[rcswhich].cap);
 447         }
 448
 449         if (*argv == NULL)
 450             usage();
 451
 452         execvp(*argv, argv);
 453         err(1, "%s", *argv);
 454     }
 455
 456     shelltype = doeval ? getshelltype() : SH_NONE;
 457
 458     if (type == ANY) /* Default to soft limits */
 459         type = SOFT;
 460
 461     /* Display limits */
 462     printf(shellparm[shelltype].cmd,
 463            lc ? " for class " : " (current)",
 464            lc ? lc->lc_class : "");
 465
 466     for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
 467         if (doall || num_limits == 0 || which_limits[rcswhich] != 0) {
 468             if (which_limits[rcswhich] == ANY)
 469                 which_limits[rcswhich] = type;
 470             if (shellparm[shelltype].lprm[rcswhich].pfx) {
 471                 if (shellparm[shelltype].both && limits[rcswhich].rlim_cur == limits[rcswhich].rlim_max) {
 472                     print_limit(limits[rcswhich].rlim_max,
 473                                 shellparm[shelltype].lprm[rcswhich].divisor,
 474                                 shellparm[shelltype].inf,
 475                                 shellparm[shelltype].lprm[rcswhich].pfx,
 476                                 shellparm[shelltype].lprm[rcswhich].sfx,
 477                                 shellparm[shelltype].both);
 478                 } else {
 479                     if (which_limits[rcswhich] & HARD) {
 480                         print_limit(limits[rcswhich].rlim_max,
 481                                     shellparm[shelltype].lprm[rcswhich].divisor,
 482                                     shellparm[shelltype].inf,
 483                                     shellparm[shelltype].lprm[rcswhich].pfx,
 484                                     shellparm[shelltype].lprm[rcswhich].sfx,
 485                                     shellparm[shelltype].hard);
 486                     }
 487                     if (which_limits[rcswhich] & SOFT) {
 488                         print_limit(limits[rcswhich].rlim_cur,
 489                                     shellparm[shelltype].lprm[rcswhich].divisor,
 490                                     shellparm[shelltype].inf,
 491                                     shellparm[shelltype].lprm[rcswhich].pfx,
 492                                     shellparm[shelltype].lprm[rcswhich].sfx,
 493                                     shellparm[shelltype].soft);
 494                     }
 495                 }
 496             }
 497         }
 498     }
 499
 500     login_close(lc);
 501     exit(EXIT_SUCCESS);
 502 }
 503
 504
 505 static void
 506 usage(void)
 507 {
 508     (void)fprintf(stderr,
 509 "usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuvk [val]] [[name=val ...] cmd]\n");
 510     exit(EXIT_FAILURE);
 511 }
 512
 513 static void
 514 print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which)
 515 {
 516     char numbr[64];
 517
 518     if (limit == RLIM_INFINITY)
 519         strcpy(numbr, inf);
 520     else
 521         sprintf(numbr, "%jd", (intmax_t)((limit + divisor/2) / divisor));
 522     printf(pfx, which, numbr);
 523     printf(sfx, which);
 524
 525 }
 526
 527
 528 static rlim_t
 529 resource_num(int which, int ch, const char *str)
 530 {
 531     rlim_t res = RLIM_INFINITY;
 532
 533     if (str != NULL &&
 534         !(strcasecmp(str, "inf") == 0 ||
 535           strcasecmp(str, "infinity") == 0 ||
 536           strcasecmp(str, "unlimit") == 0 ||
 537           strcasecmp(str, "unlimited") == 0)) {
 538         const char * s = str;
 539         char *e;
 540
 541         switch (which) {
 542         case RLIMIT_CPU:        /* time values */
 543             errno = 0;
 544             res = 0;
 545             while (*s) {
 546                 rlim_t tim = strtoq(s, &e, 0);
 547                 if (e == NULL || e == s || errno)
 548                     break;
 549                 switch (*e++) {
 550                 case 0:                 /* end of string */
 551                     e--;
 552                 default:
 553                 case 's': case 'S':     /* seconds */
 554                     break;
 555                 case 'm': case 'M':     /* minutes */
 556                     tim *= 60L;
 557                     break;
 558                 case 'h': case 'H':     /* hours */
 559                     tim *= (60L * 60L);
 560                     break;
 561                 case 'd': case 'D':     /* days */
 562                     tim *= (60L * 60L * 24L);
 563                     break;
 564                 case 'w': case 'W':     /* weeks */
 565                     tim *= (60L * 60L * 24L * 7L);
 566                     break;
 567                 case 'y': case 'Y':     /* Years */
 568                     tim *= (60L * 60L * 24L * 365L);
 569                 }
 570                 s = e;
 571                 res += tim;
 572             }
 573             break;
 574         case RLIMIT_FSIZE: /* Size values */
 575         case RLIMIT_DATA:
 576         case RLIMIT_STACK:
 577         case RLIMIT_CORE:
 578         case RLIMIT_RSS:
 579         case RLIMIT_MEMLOCK:
 580         case RLIMIT_VMEM:
 581             errno = 0;
 582             res = 0;
 583             while (*s) {
 584                 rlim_t mult, tim = strtoq(s, &e, 0);
 585                 if (e == NULL || e == s || errno)
 586                     break;
 587                 switch (*e++) {
 588                 case 0: /* end of string */
 589                     e--;
 590                     /* FALLTHROUGH */
 591                 default:
 592                     mult = 1;
 593                     break;
 594                 case 'b': case 'B':     /* 512-byte blocks */
 595                     mult = 512;
 596                     break;
 597                 case 'k': case 'K':     /* 1024-byte Kilobytes */
 598                     mult = 1024;
 599                     break;
 600                 case 'm': case 'M':     /* 1024-k kbytes */
 601                     mult = 1024 * 1024;
 602                     break;
 603                 case 'g': case 'G':     /* 1Gbyte */
 604                     mult = 1024 * 1024 * 1024;
 605                     break;
 606                 case 't': case 'T':     /* 1TBte */
 607                     mult = 1024LL * 1024LL * 1024LL * 1024LL;
 608                     break;
 609                 }
 610                 s = e;
 611                 res += (tim * mult);
 612             }
 613             break;
 614         case RLIMIT_NPROC:
 615         case RLIMIT_NOFILE:
 616             res = strtoq(s, &e, 0);
 617             s = e;
 618             break;
 619         }
 620         if (*s) {
 621             warnx("invalid value -%c `%s'", ch, str);
 622             usage();
 623         }
 624     }
 625     return res;
 626 }
 627
 628
 629 static int
 630 getshellbyname(const char * shell)
 631 {
 632     int i;
 633     const char * q;
 634     const char * p = strrchr(shell, '/');
 635
 636     p = p ? p + 1 : shell;
 637     for (i = 0; (q = shellparm[i].name) != NULL; i++) {
 638         while (*q) {
 639             int j = strcspn(q, "|");
 640
 641             if (j == 0)
 642                 break;
 643             if (strncmp(p, q, j) == 0)
 644                 return i;
 645             if (*(q += j))
 646                 ++q;
 647         }
 648     }
 649     return SH_SH;
 650 }
 651
 652
 653 /*
 654  * Determine the type of shell our parent process is
 655  * This is quite tricky, not 100% reliable and probably
 656  * not nearly as thorough as it should be. Basically, this
 657  * is a "best guess" only, but hopefully will work in
 658  * most cases.
 659  */
 660
 661 static int
 662 getshelltype(void)
 663 {
 664     pid_t ppid = getppid();
 665
 666     if (ppid != 1) {
 667         FILE * fp;
 668         struct stat st;
 669         char procdir[MAXPATHLEN], buf[128];
 670         int l = sprintf(procdir, "/proc/%ld/", (long)ppid);
 671         char * shell = getenv("SHELL");
 672
 673         if (shell != NULL && stat(shell, &st) != -1) {
 674             struct stat st1;
 675
 676             strcpy(procdir+l, "file");
 677             /* $SHELL is actual shell? */
 678             if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0)
 679                 return getshellbyname(shell);
 680         }
 681         strcpy(procdir+l, "status");
 682         if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) {
 683             char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t");
 684             fclose(fp);
 685             if (p != NULL)
 686                 return getshellbyname(p);
 687         }
 688     }
 689     return SH_SH;
 690 }
 691