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 1.2 2003/06/17 04:29:28 dillon 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 } 90 }, 91 { "sh", "unlimited", "", " -H", " -S", "", 92 { 93 { "ulimit%s -t %s", ";\n", 1 }, 94 { "ulimit%s -f %s", ";\n", 512 }, 95 { "ulimit%s -d %s", ";\n", 1024 }, 96 { "ulimit%s -s %s", ";\n", 1024 }, 97 { "ulimit%s -c %s", ";\n", 512 }, 98 { "ulimit%s -m %s", ";\n", 1024 }, 99 { "ulimit%s -l %s", ";\n", 1024 }, 100 { "ulimit%s -u %s", ";\n", 1 }, 101 { "ulimit%s -n %s", ";\n", 1 }, 102 { "ulimit%s -b %s", ";\n", 1 }, 103 { "ulimit%s -v %s", ";\n", 1024 } 104 } 105 }, 106 { "csh", "unlimited", "", " -h", "", NULL, 107 { 108 { "limit%s cputime %s", ";\n", 1 }, 109 { "limit%s filesize %s", ";\n", 1024 }, 110 { "limit%s datasize %s", ";\n", 1024 }, 111 { "limit%s stacksize %s", ";\n", 1024 }, 112 { "limit%s coredumpsize %s", ";\n", 1024 }, 113 { "limit%s memoryuse %s", ";\n", 1024 }, 114 { "limit%s memorylocked %s", ";\n", 1024 }, 115 { "limit%s maxproc %s", ";\n", 1 }, 116 { "limit%s openfiles %s", ";\n", 1 }, 117 { "limit%s sbsize %s", ";\n", 1 }, 118 { "limit%s vmemoryuse %s", ";\n", 1024 } 119 } 120 }, 121 { "bash|bash2", "unlimited", "", " -H", " -S", "", 122 { 123 { "ulimit%s -t %s", ";\n", 1 }, 124 { "ulimit%s -f %s", ";\n", 1024 }, 125 { "ulimit%s -d %s", ";\n", 1024 }, 126 { "ulimit%s -s %s", ";\n", 1024 }, 127 { "ulimit%s -c %s", ";\n", 1024 }, 128 { "ulimit%s -m %s", ";\n", 1024 }, 129 { "ulimit%s -l %s", ";\n", 1024 }, 130 { "ulimit%s -u %s", ";\n", 1 }, 131 { "ulimit%s -n %s", ";\n", 1 }, 132 { "ulimit%s -b %s", ";\n", 1 }, 133 { "ulimit%s -v %s", ";\n", 1024 } 134 } 135 }, 136 { "tcsh", "unlimited", "", " -h", "", NULL, 137 { 138 { "limit%s cputime %s", ";\n", 1 }, 139 { "limit%s filesize %s", ";\n", 1024 }, 140 { "limit%s datasize %s", ";\n", 1024 }, 141 { "limit%s stacksize %s", ";\n", 1024 }, 142 { "limit%s coredumpsize %s", ";\n", 1024 }, 143 { "limit%s memoryuse %s", ";\n", 1024 }, 144 { "limit%s memorylocked %s", ";\n", 1024 }, 145 { "limit%s maxproc %s", ";\n", 1 }, 146 { "limit%s descriptors %s", ";\n", 1 }, 147 { "limit%s sbsize %s", ";\n", 1 }, 148 { "limit%s vmemoryuse %s", ";\n", 1024 } 149 } 150 }, 151 { "ksh|pdksh", "unlimited", "", " -H", " -S", "", 152 { 153 { "ulimit%s -t %s", ";\n", 1 }, 154 { "ulimit%s -f %s", ";\n", 512 }, 155 { "ulimit%s -d %s", ";\n", 1024 }, 156 { "ulimit%s -s %s", ";\n", 1024 }, 157 { "ulimit%s -c %s", ";\n", 512 }, 158 { "ulimit%s -m %s", ";\n", 1024 }, 159 { "ulimit%s -l %s", ";\n", 1024 }, 160 { "ulimit%s -p %s", ";\n", 1 }, 161 { "ulimit%s -n %s", ";\n", 1 }, 162 { "ulimit%s -b %s", ";\n", 1 }, 163 { "ulimit%s -v %s", ";\n", 1024 } 164 } 165 }, 166 { "zsh", "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 -u %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 } 180 }, 181 { "rc|es", "unlimited", "", " -h", "", NULL, 182 { 183 { "limit%s cputime %s", ";\n", 1 }, 184 { "limit%s filesize %s", ";\n", 1024 }, 185 { "limit%s datasize %s", ";\n", 1024 }, 186 { "limit%s stacksize %s", ";\n", 1024 }, 187 { "limit%s coredumpsize %s", ";\n", 1024 }, 188 { "limit%s memoryuse %s", ";\n", 1024 }, 189 { "limit%s lockedmemory %s", ";\n", 1024 }, 190 { "limit%s processes %s", ";\n", 1 }, 191 { "limit%s descriptors %s", ";\n", 1 }, 192 { "limit%s sbsize %s", ";\n", 1 }, 193 { "limit%s vmemoryuse %s", ";\n", 1024 } 194 } 195 }, 196 { NULL } 197 }; 198 199 static struct { 200 const char * cap; 201 rlim_t (*func)(login_cap_t *, const char *, rlim_t, rlim_t); 202 } resources[RLIM_NLIMITS] = { 203 { "cputime", login_getcaptime }, 204 { "filesize", login_getcapsize }, 205 { "datasize", login_getcapsize }, 206 { "stacksize", login_getcapsize }, 207 { "coredumpsize", login_getcapsize }, 208 { "memoryuse", login_getcapsize }, 209 { "memorylocked", login_getcapsize }, 210 { "maxproc", login_getcapnum }, 211 { "openfiles", login_getcapnum }, 212 { "sbsize", login_getcapsize }, 213 { "vmemoryuse", login_getcapsize } 214 }; 215 216 /* 217 * One letter for each resource levels. 218 * NOTE: There is a dependancy on the corresponding 219 * letter index being equal to the resource number. 220 * If sys/resource.h defines are changed, this needs 221 * to be modified accordingly! 222 */ 223 224 #define RCS_STRING "tfdscmlunbv" 225 226 static rlim_t resource_num(int which, int ch, const char *str); 227 static void usage(void); 228 static int getshelltype(void); 229 static void print_limit(rlim_t limit, unsigned divisor, const char *inf, 230 const char *pfx, const char *sfx, const char *which); 231 extern char **environ; 232 233 static const char rcs_string[] = RCS_STRING; 234 235 int 236 main(int argc, char *argv[]) 237 { 238 char *p, *cls = NULL; 239 char *cleanenv[1]; 240 struct passwd * pwd = NULL; 241 int rcswhich, shelltype; 242 int i, num_limits = 0; 243 int ch, doeval = 0, doall = 0; 244 login_cap_t * lc = NULL; 245 enum { ANY=0, SOFT=1, HARD=2, BOTH=3, DISPLAYONLY=4 } type = ANY; 246 enum { RCSUNKNOWN=0, RCSSET=1, RCSSEL=2 } todo = RCSUNKNOWN; 247 int which_limits[RLIM_NLIMITS]; 248 rlim_t set_limits[RLIM_NLIMITS]; 249 struct rlimit limits[RLIM_NLIMITS]; 250 251 /* init resource tables */ 252 for (i = 0; i < RLIM_NLIMITS; i++) { 253 which_limits[i] = 0; /* Don't set/display any */ 254 set_limits[i] = RLIM_INFINITY; 255 /* Get current resource values */ 256 getrlimit(i, &limits[i]); 257 } 258 259 optarg = NULL; 260 while ((ch = getopt(argc, argv, ":EeC:U:BSHabc:d:f:l:m:n:s:t:u:v:")) != -1) { 261 switch(ch) { 262 case 'a': 263 doall = 1; 264 break; 265 case 'E': 266 environ = cleanenv; 267 cleanenv[0] = NULL; 268 break; 269 case 'e': 270 doeval = 1; 271 break; 272 case 'C': 273 cls = optarg; 274 break; 275 case 'U': 276 if ((pwd = getpwnam(optarg)) == NULL) { 277 if (!isdigit(*optarg) || 278 (pwd = getpwuid(atoi(optarg))) == NULL) { 279 warnx("invalid user `%s'", optarg); 280 usage(); 281 } 282 } 283 break; 284 case 'H': 285 type = HARD; 286 break; 287 case 'S': 288 type = SOFT; 289 break; 290 case 'B': 291 type = SOFT|HARD; 292 break; 293 default: 294 case ':': /* Without arg */ 295 if ((p = strchr(rcs_string, optopt)) != NULL) { 296 int rcswhich = p - rcs_string; 297 if (optarg && *optarg == '-') { /* 'arg' is actually a switch */ 298 --optind; /* back one arg, and make arg NULL */ 299 optarg = NULL; 300 } 301 todo = optarg == NULL ? RCSSEL : RCSSET; 302 if (type == ANY) 303 type = BOTH; 304 which_limits[rcswhich] = optarg ? type : DISPLAYONLY; 305 set_limits[rcswhich] = resource_num(rcswhich, optopt, optarg); 306 num_limits++; 307 break; 308 } 309 /* FALLTHRU */ 310 case '?': 311 usage(); 312 } 313 optarg = NULL; 314 } 315 316 /* If user was specified, get class from that */ 317 if (pwd != NULL) 318 lc = login_getpwclass(pwd); 319 else if (cls != NULL && *cls != '\0') { 320 lc = login_getclassbyname(cls, NULL); 321 if (lc == NULL || strcmp(cls, lc->lc_class) != 0) 322 fprintf(stderr, "login class '%s' non-existent, using %s\n", 323 cls, lc?lc->lc_class:"current settings"); 324 } 325 326 /* If we have a login class, update resource table from that */ 327 if (lc != NULL) { 328 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 329 char str[40]; 330 rlim_t val; 331 332 /* current value overridden by resourcename or resourcename-cur */ 333 sprintf(str, "%s-cur", resources[rcswhich].cap); 334 val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_cur, limits[rcswhich].rlim_cur); 335 limits[rcswhich].rlim_cur = resources[rcswhich].func(lc, str, val, val); 336 /* maximum value overridden by resourcename or resourcename-max */ 337 sprintf(str, "%s-max", resources[rcswhich].cap); 338 val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_max, limits[rcswhich].rlim_max); 339 limits[rcswhich].rlim_max = resources[rcswhich].func(lc, str, val, val); 340 } 341 } 342 343 /* now, let's determine what we wish to do with all this */ 344 345 argv += optind; 346 347 /* If we're setting limits or doing an eval (ie. we're not just 348 * displaying), then check that hard limits are not lower than 349 * soft limits, and force rasing the hard limit if we need to if 350 * we are raising the soft limit, or lower the soft limit if we 351 * are lowering the hard limit. 352 */ 353 if ((*argv || doeval) && getuid() == 0) { 354 355 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 356 if (limits[rcswhich].rlim_max != RLIM_INFINITY) { 357 if (limits[rcswhich].rlim_cur == RLIM_INFINITY) { 358 limits[rcswhich].rlim_max = RLIM_INFINITY; 359 which_limits[rcswhich] |= HARD; 360 } else if (limits[rcswhich].rlim_cur > limits[rcswhich].rlim_max) { 361 if (which_limits[rcswhich] == SOFT) { 362 limits[rcswhich].rlim_max = limits[rcswhich].rlim_cur; 363 which_limits[rcswhich] |= HARD; 364 } else if (which_limits[rcswhich] == HARD) { 365 limits[rcswhich].rlim_cur = limits[rcswhich].rlim_max; 366 which_limits[rcswhich] |= SOFT; 367 } else { 368 /* else.. if we're specifically setting both to 369 * silly values, then let it error out. 370 */ 371 } 372 } 373 } 374 } 375 } 376 377 /* See if we've overridden anything specific on the command line */ 378 if (num_limits && todo == RCSSET) { 379 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 380 if (which_limits[rcswhich] & HARD) 381 limits[rcswhich].rlim_max = set_limits[rcswhich]; 382 if (which_limits[rcswhich] & SOFT) 383 limits[rcswhich].rlim_cur = set_limits[rcswhich]; 384 } 385 } 386 387 /* If *argv is not NULL, then we are being asked to 388 * (perhaps) set environment variables and run a program 389 */ 390 if (*argv) { 391 if (doeval) { 392 warnx("-e cannot be used with `cmd' option"); 393 usage(); 394 } 395 396 login_close(lc); 397 398 /* set leading environment variables, like eval(1) */ 399 while (*argv && (p = strchr(*argv, '='))) 400 (void)setenv(*argv++, ++p, 1); 401 402 /* Set limits */ 403 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 404 if (doall || num_limits == 0 || which_limits[rcswhich] != 0) 405 if (setrlimit(rcswhich, &limits[rcswhich]) == -1) 406 err(1, "setrlimit %s", resources[rcswhich].cap); 407 } 408 409 if (*argv == NULL) 410 usage(); 411 412 execvp(*argv, argv); 413 err(1, "%s", *argv); 414 } 415 416 shelltype = doeval ? getshelltype() : SH_NONE; 417 418 if (type == ANY) /* Default to soft limits */ 419 type = SOFT; 420 421 /* Display limits */ 422 printf(shellparm[shelltype].cmd, 423 lc ? " for class " : " (current)", 424 lc ? lc->lc_class : ""); 425 426 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 427 if (doall || num_limits == 0 || which_limits[rcswhich] != 0) { 428 if (which_limits[rcswhich] == ANY || which_limits[rcswhich]) 429 which_limits[rcswhich] = type; 430 if (shellparm[shelltype].lprm[rcswhich].pfx) { 431 if (shellparm[shelltype].both && limits[rcswhich].rlim_cur == limits[rcswhich].rlim_max) { 432 print_limit(limits[rcswhich].rlim_max, 433 shellparm[shelltype].lprm[rcswhich].divisor, 434 shellparm[shelltype].inf, 435 shellparm[shelltype].lprm[rcswhich].pfx, 436 shellparm[shelltype].lprm[rcswhich].sfx, 437 shellparm[shelltype].both); 438 } else { 439 if (which_limits[rcswhich] & HARD) { 440 print_limit(limits[rcswhich].rlim_max, 441 shellparm[shelltype].lprm[rcswhich].divisor, 442 shellparm[shelltype].inf, 443 shellparm[shelltype].lprm[rcswhich].pfx, 444 shellparm[shelltype].lprm[rcswhich].sfx, 445 shellparm[shelltype].hard); 446 } 447 if (which_limits[rcswhich] & SOFT) { 448 print_limit(limits[rcswhich].rlim_cur, 449 shellparm[shelltype].lprm[rcswhich].divisor, 450 shellparm[shelltype].inf, 451 shellparm[shelltype].lprm[rcswhich].pfx, 452 shellparm[shelltype].lprm[rcswhich].sfx, 453 shellparm[shelltype].soft); 454 } 455 } 456 } 457 } 458 } 459 460 login_close(lc); 461 exit(EXIT_SUCCESS); 462 } 463 464 465 static void 466 usage(void) 467 { 468 (void)fprintf(stderr, 469 "usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuv [val]] [[name=val ...] cmd]\n"); 470 exit(EXIT_FAILURE); 471 } 472 473 static void 474 print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which) 475 { 476 char numbr[64]; 477 478 if (limit == RLIM_INFINITY) 479 strcpy(numbr, inf); 480 else 481 sprintf(numbr, "%qd", (quad_t)((limit + divisor/2) / divisor)); 482 printf(pfx, which, numbr); 483 printf(sfx, which); 484 485 } 486 487 488 static rlim_t 489 resource_num(int which, int ch, const char *str) 490 { 491 rlim_t res = RLIM_INFINITY; 492 493 if (str != NULL && 494 !(strcasecmp(str, "inf") == 0 || 495 strcasecmp(str, "infinity") == 0 || 496 strcasecmp(str, "unlimit") == 0 || 497 strcasecmp(str, "unlimited") == 0)) { 498 const char * s = str; 499 char *e; 500 501 switch (which) { 502 case RLIMIT_CPU: /* time values */ 503 errno = 0; 504 res = 0; 505 while (*s) { 506 rlim_t tim = strtoq(s, &e, 0); 507 if (e == NULL || e == s || errno) 508 break; 509 switch (*e++) { 510 case 0: /* end of string */ 511 e--; 512 default: 513 case 's': case 'S': /* seconds */ 514 break; 515 case 'm': case 'M': /* minutes */ 516 tim *= 60L; 517 break; 518 case 'h': case 'H': /* hours */ 519 tim *= (60L * 60L); 520 break; 521 case 'd': case 'D': /* days */ 522 tim *= (60L * 60L * 24L); 523 break; 524 case 'w': case 'W': /* weeks */ 525 tim *= (60L * 60L * 24L * 7L); 526 case 'y': case 'Y': /* Years */ 527 tim *= (60L * 60L * 24L * 365L); 528 } 529 s = e; 530 res += tim; 531 } 532 break; 533 case RLIMIT_FSIZE: /* Size values */ 534 case RLIMIT_DATA: 535 case RLIMIT_STACK: 536 case RLIMIT_CORE: 537 case RLIMIT_RSS: 538 case RLIMIT_MEMLOCK: 539 case RLIMIT_VMEM: 540 errno = 0; 541 res = 0; 542 while (*s) { 543 rlim_t mult, tim = strtoq(s, &e, 0); 544 if (e == NULL || e == s || errno) 545 break; 546 switch (*e++) { 547 case 0: /* end of string */ 548 e--; 549 default: 550 mult = 1; 551 break; 552 case 'b': case 'B': /* 512-byte blocks */ 553 mult = 512; 554 break; 555 case 'k': case 'K': /* 1024-byte Kilobytes */ 556 mult = 1024; 557 break; 558 case 'm': case 'M': /* 1024-k kbytes */ 559 mult = 1024 * 1024; 560 break; 561 case 'g': case 'G': /* 1Gbyte */ 562 mult = 1024 * 1024 * 1024; 563 break; 564 case 't': case 'T': /* 1TBte */ 565 mult = 1024LL * 1024LL * 1024LL * 1024LL; 566 break; 567 } 568 s = e; 569 res += (tim * mult); 570 } 571 break; 572 case RLIMIT_NPROC: 573 case RLIMIT_NOFILE: 574 res = strtoq(s, &e, 0); 575 s = e; 576 break; 577 } 578 if (*s) { 579 warnx("invalid value -%c `%s'", ch, str); 580 usage(); 581 } 582 } 583 return res; 584 } 585 586 587 static int 588 getshellbyname(const char * shell) 589 { 590 int i; 591 const char * q; 592 const char * p = strrchr(shell, '/'); 593 594 p = p ? ++p : shell; 595 for (i = 0; (q = shellparm[i].name) != NULL; i++) { 596 while (*q) { 597 int j = strcspn(q, "|"); 598 599 if (j == 0) 600 break; 601 if (strncmp(p, q, j) == 0) 602 return i; 603 if (*(q += j)) 604 ++q; 605 } 606 } 607 return SH_SH; 608 } 609 610 611 /* 612 * Determine the type of shell our parent process is 613 * This is quite tricky, not 100% reliable and probably 614 * not nearly as thorough as it should be. Basically, this 615 * is a "best guess" only, but hopefully will work in 616 * most cases. 617 */ 618 619 static int 620 getshelltype(void) 621 { 622 pid_t ppid = getppid(); 623 624 if (ppid != 1) { 625 FILE * fp; 626 struct stat st; 627 char procdir[MAXPATHLEN], buf[128]; 628 int l = sprintf(procdir, "/proc/%ld/", (long)ppid); 629 char * shell = getenv("SHELL"); 630 631 if (shell != NULL && stat(shell, &st) != -1) { 632 struct stat st1; 633 634 strcpy(procdir+l, "file"); 635 /* $SHELL is actual shell? */ 636 if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0) 637 return getshellbyname(shell); 638 } 639 strcpy(procdir+l, "status"); 640 if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) { 641 char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t"); 642 fclose(fp); 643 if (p != NULL) 644 return getshellbyname(p); 645 } 646 } 647 return SH_SH; 648 } 649 650