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 * $DragonFly: src/usr.bin/limits/limits.c,v 1.6 2006/03/06 03:10:51 swildner Exp $ 25 */ 26 27 #include <err.h> 28 #include <stdio.h> 29 #include <string.h> 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 #include <sys/param.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include <stdarg.h> 36 #include <ctype.h> 37 #include <errno.h> 38 #include <pwd.h> 39 #include <login_cap.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 43 enum 44 { 45 SH_NONE, 46 SH_SH, /* sh */ 47 SH_CSH, /* csh */ 48 SH_BASH, /* gnu bash */ 49 SH_TCSH, /* tcsh */ 50 SH_KSH, /* (pd)ksh */ 51 SH_ZSH, /* zsh */ 52 SH_RC, /* rc or es */ 53 SH_NUMBER 54 }; 55 56 57 /* eval emitter for popular shells. 58 * Why aren't there any standards here? Most shells support either 59 * the csh 'limit' or sh 'ulimit' command, but each varies just 60 * enough that they aren't very compatible from one to the other. 61 */ 62 static struct { 63 const char * name; /* Name of shell */ 64 const char * inf; /* Name used for 'unlimited' resource */ 65 const char * cmd; /* Intro text */ 66 const char * hard; /* Hard limit text */ 67 const char * soft; /* Soft limit text */ 68 const char * both; /* Hard+Soft limit text */ 69 struct { 70 const char * pfx; 71 const char * sfx; 72 int divisor; 73 } lprm[RLIM_NLIMITS]; 74 } shellparm[] = 75 { 76 { "", "infinity", "Resource limits%s%s:\n", "-max", "-cur", "", 77 { 78 { " cputime%-4s %8s", " secs\n", 1 }, 79 { " filesize%-4s %8s", " kb\n", 1024 }, 80 { " datasize%-4s %8s", " kb\n", 1024 }, 81 { " stacksize%-4s %8s", " kb\n", 1024 }, 82 { " coredumpsize%-4s %8s", " kb\n", 1024 }, 83 { " memoryuse%-4s %8s", " kb\n", 1024 }, 84 { " memorylocked%-4s %8s", " kb\n", 1024 }, 85 { " maxprocesses%-4s %8s", "\n", 1 }, 86 { " openfiles%-4s %8s", "\n", 1 }, 87 { " sbsize%-4s %8s", " bytes\n", 1 }, 88 { " vmemoryuse%-4s %8s", " kb\n", 1024 }, 89 #ifdef RLIMIT_POSIXLOCKS 90 { " posixlocks%-4s %8s", "\n", 1 }, 91 #endif 92 } 93 }, 94 { "sh", "unlimited", "", " -H", " -S", "", 95 { 96 { "ulimit%s -t %s", ";\n", 1 }, 97 { "ulimit%s -f %s", ";\n", 512 }, 98 { "ulimit%s -d %s", ";\n", 1024 }, 99 { "ulimit%s -s %s", ";\n", 1024 }, 100 { "ulimit%s -c %s", ";\n", 512 }, 101 { "ulimit%s -m %s", ";\n", 1024 }, 102 { "ulimit%s -l %s", ";\n", 1024 }, 103 { "ulimit%s -u %s", ";\n", 1 }, 104 { "ulimit%s -n %s", ";\n", 1 }, 105 { "ulimit%s -b %s", ";\n", 1 }, 106 { "ulimit%s -v %s", ";\n", 1024 }, 107 #ifdef RLIMIT_POSIXLOCKS 108 { "ulimit%s -k %s", ";\n", 1 }, 109 #endif 110 } 111 }, 112 { "csh", "unlimited", "", " -h", "", NULL, 113 { 114 { "limit%s cputime %s", ";\n", 1 }, 115 { "limit%s filesize %s", ";\n", 1024 }, 116 { "limit%s datasize %s", ";\n", 1024 }, 117 { "limit%s stacksize %s", ";\n", 1024 }, 118 { "limit%s coredumpsize %s", ";\n", 1024 }, 119 { "limit%s memoryuse %s", ";\n", 1024 }, 120 { "limit%s memorylocked %s", ";\n", 1024 }, 121 { "limit%s maxproc %s", ";\n", 1 }, 122 { "limit%s openfiles %s", ";\n", 1 }, 123 { "limit%s sbsize %s", ";\n", 1 }, 124 { "limit%s vmemoryuse %s", ";\n", 1024 }, 125 #ifdef RLIMIT_POSIXLOCKS 126 { "limit%s advlocks %s", ";\n", 1 }, 127 #endif 128 } 129 }, 130 { "bash|bash2", "unlimited", "", " -H", " -S", "", 131 { 132 { "ulimit%s -t %s", ";\n", 1 }, 133 { "ulimit%s -f %s", ";\n", 1024 }, 134 { "ulimit%s -d %s", ";\n", 1024 }, 135 { "ulimit%s -s %s", ";\n", 1024 }, 136 { "ulimit%s -c %s", ";\n", 1024 }, 137 { "ulimit%s -m %s", ";\n", 1024 }, 138 { "ulimit%s -l %s", ";\n", 1024 }, 139 { "ulimit%s -u %s", ";\n", 1 }, 140 { "ulimit%s -n %s", ";\n", 1 }, 141 { "ulimit%s -b %s", ";\n", 1 }, 142 { "ulimit%s -v %s", ";\n", 1024 }, 143 #ifdef RLIMIT_POSIXLOCKS 144 { "ulimit%s -k %s", ";\n", 1 }, 145 #endif 146 } 147 }, 148 { "tcsh", "unlimited", "", " -h", "", NULL, 149 { 150 { "limit%s cputime %s", ";\n", 1 }, 151 { "limit%s filesize %s", ";\n", 1024 }, 152 { "limit%s datasize %s", ";\n", 1024 }, 153 { "limit%s stacksize %s", ";\n", 1024 }, 154 { "limit%s coredumpsize %s", ";\n", 1024 }, 155 { "limit%s memoryuse %s", ";\n", 1024 }, 156 { "limit%s memorylocked %s", ";\n", 1024 }, 157 { "limit%s maxproc %s", ";\n", 1 }, 158 { "limit%s descriptors %s", ";\n", 1 }, 159 { "limit%s sbsize %s", ";\n", 1 }, 160 { "limit%s vmemoryuse %s", ";\n", 1024 }, 161 #ifdef RLIMIT_POSIXLOCKS 162 { "limit%s advlocks %s", ";\n", 1 }, 163 #endif 164 } 165 }, 166 { "ksh|pdksh", "unlimited", "", " -H", " -S", "", 167 { 168 { "ulimit%s -t %s", ";\n", 1 }, 169 { "ulimit%s -f %s", ";\n", 512 }, 170 { "ulimit%s -d %s", ";\n", 1024 }, 171 { "ulimit%s -s %s", ";\n", 1024 }, 172 { "ulimit%s -c %s", ";\n", 512 }, 173 { "ulimit%s -m %s", ";\n", 1024 }, 174 { "ulimit%s -l %s", ";\n", 1024 }, 175 { "ulimit%s -p %s", ";\n", 1 }, 176 { "ulimit%s -n %s", ";\n", 1 }, 177 { "ulimit%s -b %s", ";\n", 1 }, 178 { "ulimit%s -v %s", ";\n", 1024 }, 179 #ifdef RLIMIT_POSIXLOCKS 180 { "ulimit%s -k %s", ";\n", 1 }, 181 #endif 182 } 183 }, 184 { "zsh", "unlimited", "", " -H", " -S", "", 185 { 186 { "ulimit%s -t %s", ";\n", 1 }, 187 { "ulimit%s -f %s", ";\n", 512 }, 188 { "ulimit%s -d %s", ";\n", 1024 }, 189 { "ulimit%s -s %s", ";\n", 1024 }, 190 { "ulimit%s -c %s", ";\n", 512 }, 191 { "ulimit%s -m %s", ";\n", 1024 }, 192 { "ulimit%s -l %s", ";\n", 1024 }, 193 { "ulimit%s -u %s", ";\n", 1 }, 194 { "ulimit%s -n %s", ";\n", 1 }, 195 { "ulimit%s -b %s", ";\n", 1 }, 196 { "ulimit%s -v %s", ";\n", 1024 }, 197 #ifdef RLIMIT_POSIXLOCKS 198 { "ulimit%s -k %s", ";\n", 1 }, 199 #endif 200 } 201 }, 202 { "rc|es", "unlimited", "", " -h", "", NULL, 203 { 204 { "limit%s cputime %s", ";\n", 1 }, 205 { "limit%s filesize %s", ";\n", 1024 }, 206 { "limit%s datasize %s", ";\n", 1024 }, 207 { "limit%s stacksize %s", ";\n", 1024 }, 208 { "limit%s coredumpsize %s", ";\n", 1024 }, 209 { "limit%s memoryuse %s", ";\n", 1024 }, 210 { "limit%s lockedmemory %s", ";\n", 1024 }, 211 { "limit%s processes %s", ";\n", 1 }, 212 { "limit%s descriptors %s", ";\n", 1 }, 213 { "limit%s sbsize %s", ";\n", 1 }, 214 { "limit%s vmemoryuse %s", ";\n", 1024 }, 215 #ifdef RLIMIT_POSIXLOCKS 216 { "limit%s advlocks %s", ";\n", 1 }, 217 #endif 218 } 219 }, 220 { NULL, NULL, NULL, NULL, NULL, NULL, {} } 221 }; 222 223 static struct { 224 const char * cap; 225 rlim_t (*func)(login_cap_t *, const char *, rlim_t, rlim_t); 226 } resources[RLIM_NLIMITS] = { 227 { "cputime", login_getcaptime }, 228 { "filesize", login_getcapsize }, 229 { "datasize", login_getcapsize }, 230 { "stacksize", login_getcapsize }, 231 { "coredumpsize", login_getcapsize }, 232 { "memoryuse", login_getcapsize }, 233 { "memorylocked", login_getcapsize }, 234 { "maxproc", login_getcapnum }, 235 { "openfiles", login_getcapnum }, 236 { "sbsize", login_getcapsize }, 237 { "vmemoryuse", login_getcapsize }, 238 { "posixlocks", login_getcapnum }, 239 }; 240 241 /* 242 * One letter for each resource levels. 243 * NOTE: There is a dependancy on the corresponding 244 * letter index being equal to the resource number. 245 * If sys/resource.h defines are changed, this needs 246 * to be modified accordingly! 247 */ 248 249 #define RCS_STRING "tfdscmlunbvk" 250 251 static rlim_t resource_num(int which, int ch, const char *str); 252 static void usage(void); 253 static int getshelltype(void); 254 static void print_limit(rlim_t limit, unsigned divisor, const char *inf, 255 const char *pfx, const char *sfx, const char *which); 256 extern char **environ; 257 258 static const char rcs_string[] = RCS_STRING; 259 260 int 261 main(int argc, char *argv[]) 262 { 263 char *p, *cls = NULL; 264 char *cleanenv[1]; 265 struct passwd * pwd = NULL; 266 int rcswhich, shelltype; 267 int i, num_limits = 0; 268 int ch, doeval = 0, doall = 0; 269 login_cap_t * lc = NULL; 270 enum { ANY=0, SOFT=1, HARD=2, BOTH=3, DISPLAYONLY=4 } type = ANY; 271 enum { RCSUNKNOWN=0, RCSSET=1, RCSSEL=2 } todo = RCSUNKNOWN; 272 int which_limits[RLIM_NLIMITS]; 273 rlim_t set_limits[RLIM_NLIMITS]; 274 struct rlimit limits[RLIM_NLIMITS]; 275 276 /* init resource tables */ 277 for (i = 0; i < RLIM_NLIMITS; i++) { 278 which_limits[i] = 0; /* Don't set/display any */ 279 set_limits[i] = RLIM_INFINITY; 280 /* Get current resource values */ 281 if (getrlimit(i, &limits[i]) < 0) { 282 limits[i].rlim_cur = -1; 283 limits[i].rlim_max = -1; 284 } 285 } 286 287 optarg = NULL; 288 while ((ch = getopt(argc, argv, ":EeC:U:BSHabc:d:f:k:l:m:n:s:t:u:v:")) != -1) { 289 switch(ch) { 290 case 'a': 291 doall = 1; 292 break; 293 case 'E': 294 environ = cleanenv; 295 cleanenv[0] = NULL; 296 break; 297 case 'e': 298 doeval = 1; 299 break; 300 case 'C': 301 cls = optarg; 302 break; 303 case 'U': 304 if ((pwd = getpwnam(optarg)) == NULL) { 305 if (!isdigit(*optarg) || 306 (pwd = getpwuid(atoi(optarg))) == NULL) { 307 warnx("invalid user `%s'", optarg); 308 usage(); 309 } 310 } 311 break; 312 case 'H': 313 type = HARD; 314 break; 315 case 'S': 316 type = SOFT; 317 break; 318 case 'B': 319 type = SOFT|HARD; 320 break; 321 default: 322 case ':': /* Without arg */ 323 if ((p = strchr(rcs_string, optopt)) != NULL) { 324 rcswhich = p - rcs_string; 325 326 /* 327 * Backwards compatibility with earlier kernel which might 328 * support fewer resources. 329 */ 330 if (rcswhich >= RLIM_NLIMITS) { 331 usage(); 332 break; 333 } 334 if (optarg && *optarg == '-') { /* 'arg' is actually a switch */ 335 --optind; /* back one arg, and make arg NULL */ 336 optarg = NULL; 337 } 338 todo = optarg == NULL ? RCSSEL : RCSSET; 339 if (type == ANY) 340 type = BOTH; 341 which_limits[rcswhich] = optarg ? type : DISPLAYONLY; 342 set_limits[rcswhich] = resource_num(rcswhich, optopt, optarg); 343 num_limits++; 344 break; 345 } 346 /* FALLTHRU */ 347 case '?': 348 usage(); 349 } 350 optarg = NULL; 351 } 352 353 /* If user was specified, get class from that */ 354 if (pwd != NULL) 355 lc = login_getpwclass(pwd); 356 else if (cls != NULL && *cls != '\0') { 357 lc = login_getclassbyname(cls, NULL); 358 if (lc == NULL || strcmp(cls, lc->lc_class) != 0) 359 fprintf(stderr, "login class '%s' non-existent, using %s\n", 360 cls, lc?lc->lc_class:"current settings"); 361 } 362 363 /* If we have a login class, update resource table from that */ 364 if (lc != NULL) { 365 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 366 char str[40]; 367 rlim_t val; 368 369 /* current value overridden by resourcename or resourcename-cur */ 370 sprintf(str, "%s-cur", resources[rcswhich].cap); 371 val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_cur, limits[rcswhich].rlim_cur); 372 limits[rcswhich].rlim_cur = resources[rcswhich].func(lc, str, val, val); 373 /* maximum value overridden by resourcename or resourcename-max */ 374 sprintf(str, "%s-max", resources[rcswhich].cap); 375 val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_max, limits[rcswhich].rlim_max); 376 limits[rcswhich].rlim_max = resources[rcswhich].func(lc, str, val, val); 377 } 378 } 379 380 /* now, let's determine what we wish to do with all this */ 381 382 argv += optind; 383 384 /* If we're setting limits or doing an eval (ie. we're not just 385 * displaying), then check that hard limits are not lower than 386 * soft limits, and force rasing the hard limit if we need to if 387 * we are raising the soft limit, or lower the soft limit if we 388 * are lowering the hard limit. 389 */ 390 if ((*argv || doeval) && getuid() == 0) { 391 392 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 393 if (limits[rcswhich].rlim_max != RLIM_INFINITY) { 394 if (limits[rcswhich].rlim_cur == RLIM_INFINITY) { 395 limits[rcswhich].rlim_max = RLIM_INFINITY; 396 which_limits[rcswhich] |= HARD; 397 } else if (limits[rcswhich].rlim_cur > limits[rcswhich].rlim_max) { 398 if (which_limits[rcswhich] == SOFT) { 399 limits[rcswhich].rlim_max = limits[rcswhich].rlim_cur; 400 which_limits[rcswhich] |= HARD; 401 } else if (which_limits[rcswhich] == HARD) { 402 limits[rcswhich].rlim_cur = limits[rcswhich].rlim_max; 403 which_limits[rcswhich] |= SOFT; 404 } else { 405 /* else.. if we're specifically setting both to 406 * silly values, then let it error out. 407 */ 408 } 409 } 410 } 411 } 412 } 413 414 /* See if we've overridden anything specific on the command line */ 415 if (num_limits && todo == RCSSET) { 416 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 417 if (which_limits[rcswhich] & HARD) 418 limits[rcswhich].rlim_max = set_limits[rcswhich]; 419 if (which_limits[rcswhich] & SOFT) 420 limits[rcswhich].rlim_cur = set_limits[rcswhich]; 421 } 422 } 423 424 /* If *argv is not NULL, then we are being asked to 425 * (perhaps) set environment variables and run a program 426 */ 427 if (*argv) { 428 if (doeval) { 429 warnx("-e cannot be used with `cmd' option"); 430 usage(); 431 } 432 433 login_close(lc); 434 435 /* set leading environment variables, like eval(1) */ 436 while (*argv && (p = strchr(*argv, '='))) { 437 if (setenv(*argv++, ++p, 1) == -1) 438 err(1, "setenv: cannot set %s=%s", *argv, p); 439 } 440 441 /* Set limits */ 442 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 443 if (doall || num_limits == 0 || which_limits[rcswhich] != 0) 444 if (setrlimit(rcswhich, &limits[rcswhich]) == -1) 445 err(1, "setrlimit %s", resources[rcswhich].cap); 446 } 447 448 if (*argv == NULL) 449 usage(); 450 451 execvp(*argv, argv); 452 err(1, "%s", *argv); 453 } 454 455 shelltype = doeval ? getshelltype() : SH_NONE; 456 457 if (type == ANY) /* Default to soft limits */ 458 type = SOFT; 459 460 /* Display limits */ 461 printf(shellparm[shelltype].cmd, 462 lc ? " for class " : " (current)", 463 lc ? lc->lc_class : ""); 464 465 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 466 if (doall || num_limits == 0 || which_limits[rcswhich] != 0) { 467 if (which_limits[rcswhich] == ANY || which_limits[rcswhich]) 468 which_limits[rcswhich] = type; 469 if (shellparm[shelltype].lprm[rcswhich].pfx) { 470 if (shellparm[shelltype].both && limits[rcswhich].rlim_cur == limits[rcswhich].rlim_max) { 471 print_limit(limits[rcswhich].rlim_max, 472 shellparm[shelltype].lprm[rcswhich].divisor, 473 shellparm[shelltype].inf, 474 shellparm[shelltype].lprm[rcswhich].pfx, 475 shellparm[shelltype].lprm[rcswhich].sfx, 476 shellparm[shelltype].both); 477 } else { 478 if (which_limits[rcswhich] & HARD) { 479 print_limit(limits[rcswhich].rlim_max, 480 shellparm[shelltype].lprm[rcswhich].divisor, 481 shellparm[shelltype].inf, 482 shellparm[shelltype].lprm[rcswhich].pfx, 483 shellparm[shelltype].lprm[rcswhich].sfx, 484 shellparm[shelltype].hard); 485 } 486 if (which_limits[rcswhich] & SOFT) { 487 print_limit(limits[rcswhich].rlim_cur, 488 shellparm[shelltype].lprm[rcswhich].divisor, 489 shellparm[shelltype].inf, 490 shellparm[shelltype].lprm[rcswhich].pfx, 491 shellparm[shelltype].lprm[rcswhich].sfx, 492 shellparm[shelltype].soft); 493 } 494 } 495 } 496 } 497 } 498 499 login_close(lc); 500 exit(EXIT_SUCCESS); 501 } 502 503 504 static void 505 usage(void) 506 { 507 (void)fprintf(stderr, 508 "usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuvk [val]] [[name=val ...] cmd]\n"); 509 exit(EXIT_FAILURE); 510 } 511 512 static void 513 print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which) 514 { 515 char numbr[64]; 516 517 if (limit == RLIM_INFINITY) 518 strcpy(numbr, inf); 519 else 520 sprintf(numbr, "%qd", (quad_t)((limit + divisor/2) / divisor)); 521 printf(pfx, which, numbr); 522 printf(sfx, which); 523 524 } 525 526 527 static rlim_t 528 resource_num(int which, int ch, const char *str) 529 { 530 rlim_t res = RLIM_INFINITY; 531 532 if (str != NULL && 533 !(strcasecmp(str, "inf") == 0 || 534 strcasecmp(str, "infinity") == 0 || 535 strcasecmp(str, "unlimit") == 0 || 536 strcasecmp(str, "unlimited") == 0)) { 537 const char * s = str; 538 char *e; 539 540 switch (which) { 541 case RLIMIT_CPU: /* time values */ 542 errno = 0; 543 res = 0; 544 while (*s) { 545 rlim_t tim = strtoq(s, &e, 0); 546 if (e == NULL || e == s || errno) 547 break; 548 switch (*e++) { 549 case 0: /* end of string */ 550 e--; 551 default: 552 case 's': case 'S': /* seconds */ 553 break; 554 case 'm': case 'M': /* minutes */ 555 tim *= 60L; 556 break; 557 case 'h': case 'H': /* hours */ 558 tim *= (60L * 60L); 559 break; 560 case 'd': case 'D': /* days */ 561 tim *= (60L * 60L * 24L); 562 break; 563 case 'w': case 'W': /* weeks */ 564 tim *= (60L * 60L * 24L * 7L); 565 case 'y': case 'Y': /* Years */ 566 tim *= (60L * 60L * 24L * 365L); 567 } 568 s = e; 569 res += tim; 570 } 571 break; 572 case RLIMIT_FSIZE: /* Size values */ 573 case RLIMIT_DATA: 574 case RLIMIT_STACK: 575 case RLIMIT_CORE: 576 case RLIMIT_RSS: 577 case RLIMIT_MEMLOCK: 578 case RLIMIT_VMEM: 579 errno = 0; 580 res = 0; 581 while (*s) { 582 rlim_t mult, tim = strtoq(s, &e, 0); 583 if (e == NULL || e == s || errno) 584 break; 585 switch (*e++) { 586 case 0: /* end of string */ 587 e--; 588 default: 589 mult = 1; 590 break; 591 case 'b': case 'B': /* 512-byte blocks */ 592 mult = 512; 593 break; 594 case 'k': case 'K': /* 1024-byte Kilobytes */ 595 mult = 1024; 596 break; 597 case 'm': case 'M': /* 1024-k kbytes */ 598 mult = 1024 * 1024; 599 break; 600 case 'g': case 'G': /* 1Gbyte */ 601 mult = 1024 * 1024 * 1024; 602 break; 603 case 't': case 'T': /* 1TBte */ 604 mult = 1024LL * 1024LL * 1024LL * 1024LL; 605 break; 606 } 607 s = e; 608 res += (tim * mult); 609 } 610 break; 611 case RLIMIT_NPROC: 612 case RLIMIT_NOFILE: 613 res = strtoq(s, &e, 0); 614 s = e; 615 break; 616 } 617 if (*s) { 618 warnx("invalid value -%c `%s'", ch, str); 619 usage(); 620 } 621 } 622 return res; 623 } 624 625 626 static int 627 getshellbyname(const char * shell) 628 { 629 int i; 630 const char * q; 631 const char * p = strrchr(shell, '/'); 632 633 p = p ? p + 1 : shell; 634 for (i = 0; (q = shellparm[i].name) != NULL; i++) { 635 while (*q) { 636 int j = strcspn(q, "|"); 637 638 if (j == 0) 639 break; 640 if (strncmp(p, q, j) == 0) 641 return i; 642 if (*(q += j)) 643 ++q; 644 } 645 } 646 return SH_SH; 647 } 648 649 650 /* 651 * Determine the type of shell our parent process is 652 * This is quite tricky, not 100% reliable and probably 653 * not nearly as thorough as it should be. Basically, this 654 * is a "best guess" only, but hopefully will work in 655 * most cases. 656 */ 657 658 static int 659 getshelltype(void) 660 { 661 pid_t ppid = getppid(); 662 663 if (ppid != 1) { 664 FILE * fp; 665 struct stat st; 666 char procdir[MAXPATHLEN], buf[128]; 667 int l = sprintf(procdir, "/proc/%ld/", (long)ppid); 668 char * shell = getenv("SHELL"); 669 670 if (shell != NULL && stat(shell, &st) != -1) { 671 struct stat st1; 672 673 strcpy(procdir+l, "file"); 674 /* $SHELL is actual shell? */ 675 if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0) 676 return getshellbyname(shell); 677 } 678 strcpy(procdir+l, "status"); 679 if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) { 680 char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t"); 681 fclose(fp); 682 if (p != NULL) 683 return getshellbyname(p); 684 } 685 } 686 return SH_SH; 687 } 688 689