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 24 #include <sys/cdefs.h> 25 __FBSDID("$FreeBSD$"); 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 <stdint.h> 37 #include <ctype.h> 38 #include <errno.h> 39 #include <pwd.h> 40 #include <login_cap.h> 41 #include <sys/time.h> 42 #include <sys/resource.h> 43 44 enum 45 { 46 SH_NONE, 47 SH_SH, /* sh */ 48 SH_CSH, /* csh */ 49 SH_BASH, /* gnu bash */ 50 SH_TCSH, /* tcsh */ 51 SH_KSH, /* (pd)ksh */ 52 SH_ZSH, /* zsh */ 53 SH_RC, /* rc or es */ 54 SH_NUMBER 55 }; 56 57 58 /* eval emitter for popular shells. 59 * Why aren't there any standards here? Most shells support either 60 * the csh 'limit' or sh 'ulimit' command, but each varies just 61 * enough that they aren't very compatible from one to the other. 62 */ 63 static struct { 64 const char * name; /* Name of shell */ 65 const char * inf; /* Name used for 'unlimited' resource */ 66 const char * cmd; /* Intro text */ 67 const char * hard; /* Hard limit text */ 68 const char * soft; /* Soft limit text */ 69 const char * both; /* Hard+Soft limit text */ 70 struct { 71 const char * pfx; 72 const char * sfx; 73 int divisor; 74 } lprm[RLIM_NLIMITS]; 75 } shellparm[] = 76 { 77 { "", "infinity", "Resource limits%s%s:\n", "-max", "-cur", "", 78 { 79 { " cputime%-4s %8s", " secs\n", 1 }, 80 { " filesize%-4s %8s", " kb\n", 1024 }, 81 { " datasize%-4s %8s", " kb\n", 1024 }, 82 { " stacksize%-4s %8s", " kb\n", 1024 }, 83 { " coredumpsize%-4s %8s", " kb\n", 1024 }, 84 { " memoryuse%-4s %8s", " kb\n", 1024 }, 85 { " memorylocked%-4s %8s", " kb\n", 1024 }, 86 { " maxprocesses%-4s %8s", "\n", 1 }, 87 { " openfiles%-4s %8s", "\n", 1 }, 88 { " sbsize%-4s %8s", " bytes\n", 1 }, 89 { " vmemoryuse%-4s %8s", " kb\n", 1024 } 90 } 91 }, 92 { "sh", "unlimited", "", " -H", " -S", "", 93 { 94 { "ulimit%s -t %s", ";\n", 1 }, 95 { "ulimit%s -f %s", ";\n", 512 }, 96 { "ulimit%s -d %s", ";\n", 1024 }, 97 { "ulimit%s -s %s", ";\n", 1024 }, 98 { "ulimit%s -c %s", ";\n", 512 }, 99 { "ulimit%s -m %s", ";\n", 1024 }, 100 { "ulimit%s -l %s", ";\n", 1024 }, 101 { "ulimit%s -u %s", ";\n", 1 }, 102 { "ulimit%s -n %s", ";\n", 1 }, 103 { "ulimit%s -b %s", ";\n", 1 }, 104 { "ulimit%s -v %s", ";\n", 1024 } 105 } 106 }, 107 { "csh", "unlimited", "", " -h", "", NULL, 108 { 109 { "limit%s cputime %s", ";\n", 1 }, 110 { "limit%s filesize %s", ";\n", 1024 }, 111 { "limit%s datasize %s", ";\n", 1024 }, 112 { "limit%s stacksize %s", ";\n", 1024 }, 113 { "limit%s coredumpsize %s", ";\n", 1024 }, 114 { "limit%s memoryuse %s", ";\n", 1024 }, 115 { "limit%s memorylocked %s", ";\n", 1024 }, 116 { "limit%s maxproc %s", ";\n", 1 }, 117 { "limit%s openfiles %s", ";\n", 1 }, 118 { "limit%s sbsize %s", ";\n", 1 }, 119 { "limit%s vmemoryuse %s", ";\n", 1024 } 120 } 121 }, 122 { "bash|bash2", "unlimited", "", " -H", " -S", "", 123 { 124 { "ulimit%s -t %s", ";\n", 1 }, 125 { "ulimit%s -f %s", ";\n", 1024 }, 126 { "ulimit%s -d %s", ";\n", 1024 }, 127 { "ulimit%s -s %s", ";\n", 1024 }, 128 { "ulimit%s -c %s", ";\n", 1024 }, 129 { "ulimit%s -m %s", ";\n", 1024 }, 130 { "ulimit%s -l %s", ";\n", 1024 }, 131 { "ulimit%s -u %s", ";\n", 1 }, 132 { "ulimit%s -n %s", ";\n", 1 }, 133 { "ulimit%s -b %s", ";\n", 1 }, 134 { "ulimit%s -v %s", ";\n", 1024 } 135 } 136 }, 137 { "tcsh", "unlimited", "", " -h", "", NULL, 138 { 139 { "limit%s cputime %s", ";\n", 1 }, 140 { "limit%s filesize %s", ";\n", 1024 }, 141 { "limit%s datasize %s", ";\n", 1024 }, 142 { "limit%s stacksize %s", ";\n", 1024 }, 143 { "limit%s coredumpsize %s", ";\n", 1024 }, 144 { "limit%s memoryuse %s", ";\n", 1024 }, 145 { "limit%s memorylocked %s", ";\n", 1024 }, 146 { "limit%s maxproc %s", ";\n", 1 }, 147 { "limit%s descriptors %s", ";\n", 1 }, 148 { "limit%s sbsize %s", ";\n", 1 }, 149 { "limit%s vmemoryuse %s", ";\n", 1024 } 150 } 151 }, 152 { "ksh|pdksh", "unlimited", "", " -H", " -S", "", 153 { 154 { "ulimit%s -t %s", ";\n", 1 }, 155 { "ulimit%s -f %s", ";\n", 512 }, 156 { "ulimit%s -d %s", ";\n", 1024 }, 157 { "ulimit%s -s %s", ";\n", 1024 }, 158 { "ulimit%s -c %s", ";\n", 512 }, 159 { "ulimit%s -m %s", ";\n", 1024 }, 160 { "ulimit%s -l %s", ";\n", 1024 }, 161 { "ulimit%s -p %s", ";\n", 1 }, 162 { "ulimit%s -n %s", ";\n", 1 }, 163 { "ulimit%s -b %s", ";\n", 1 }, 164 { "ulimit%s -v %s", ";\n", 1024 } 165 } 166 }, 167 { "zsh", "unlimited", "", " -H", " -S", "", 168 { 169 { "ulimit%s -t %s", ";\n", 1 }, 170 { "ulimit%s -f %s", ";\n", 512 }, 171 { "ulimit%s -d %s", ";\n", 1024 }, 172 { "ulimit%s -s %s", ";\n", 1024 }, 173 { "ulimit%s -c %s", ";\n", 512 }, 174 { "ulimit%s -m %s", ";\n", 1024 }, 175 { "ulimit%s -l %s", ";\n", 1024 }, 176 { "ulimit%s -u %s", ";\n", 1 }, 177 { "ulimit%s -n %s", ";\n", 1 }, 178 { "ulimit%s -b %s", ";\n", 1 }, 179 { "ulimit%s -v %s", ";\n", 1024 } 180 } 181 }, 182 { "rc|es", "unlimited", "", " -h", "", NULL, 183 { 184 { "limit%s cputime %s", ";\n", 1 }, 185 { "limit%s filesize %s", ";\n", 1024 }, 186 { "limit%s datasize %s", ";\n", 1024 }, 187 { "limit%s stacksize %s", ";\n", 1024 }, 188 { "limit%s coredumpsize %s", ";\n", 1024 }, 189 { "limit%s memoryuse %s", ";\n", 1024 }, 190 { "limit%s lockedmemory %s", ";\n", 1024 }, 191 { "limit%s processes %s", ";\n", 1 }, 192 { "limit%s descriptors %s", ";\n", 1 }, 193 { "limit%s sbsize %s", ";\n", 1 }, 194 { "limit%s vmemoryuse %s", ";\n", 1024 } 195 } 196 }, 197 { NULL, NULL, NULL, NULL, NULL, NULL, 198 { } 199 } 200 }; 201 202 static struct { 203 const char * cap; 204 rlim_t (*func)(login_cap_t *, const char *, rlim_t, rlim_t); 205 } resources[RLIM_NLIMITS] = { 206 { "cputime", login_getcaptime }, 207 { "filesize", login_getcapsize }, 208 { "datasize", login_getcapsize }, 209 { "stacksize", login_getcapsize }, 210 { "coredumpsize", login_getcapsize }, 211 { "memoryuse", login_getcapsize }, 212 { "memorylocked", login_getcapsize }, 213 { "maxproc", login_getcapnum }, 214 { "openfiles", login_getcapnum }, 215 { "sbsize", login_getcapsize }, 216 { "vmemoryuse", login_getcapsize } 217 }; 218 219 /* 220 * One letter for each resource levels. 221 * NOTE: There is a dependancy on the corresponding 222 * letter index being equal to the resource number. 223 * If sys/resource.h defines are changed, this needs 224 * to be modified accordingly! 225 */ 226 227 #define RCS_STRING "tfdscmlunbv" 228 229 static rlim_t resource_num(int which, int ch, const char *str); 230 static void usage(void); 231 static int getshelltype(void); 232 static void print_limit(rlim_t limit, unsigned divisor, const char *inf, 233 const char *pfx, const char *sfx, const char *which); 234 extern char **environ; 235 236 static const char rcs_string[] = RCS_STRING; 237 238 int 239 main(int argc, char *argv[]) 240 { 241 char *p, *cls = NULL; 242 char *cleanenv[1]; 243 struct passwd * pwd = NULL; 244 int rcswhich, shelltype; 245 int i, num_limits = 0; 246 int ch, doeval = 0, doall = 0; 247 login_cap_t * lc = NULL; 248 enum { ANY=0, SOFT=1, HARD=2, BOTH=3, DISPLAYONLY=4 } type = ANY; 249 enum { RCSUNKNOWN=0, RCSSET=1, RCSSEL=2 } todo = RCSUNKNOWN; 250 int which_limits[RLIM_NLIMITS]; 251 rlim_t set_limits[RLIM_NLIMITS]; 252 struct rlimit limits[RLIM_NLIMITS]; 253 254 /* init resource tables */ 255 for (i = 0; i < RLIM_NLIMITS; i++) { 256 which_limits[i] = 0; /* Don't set/display any */ 257 set_limits[i] = RLIM_INFINITY; 258 /* Get current resource values */ 259 getrlimit(i, &limits[i]); 260 } 261 262 optarg = NULL; 263 while ((ch = getopt(argc, argv, ":EeC:U:BSHab:c:d:f:l:m:n:s:t:u:v:")) != -1) { 264 switch(ch) { 265 case 'a': 266 doall = 1; 267 break; 268 case 'E': 269 environ = cleanenv; 270 cleanenv[0] = NULL; 271 break; 272 case 'e': 273 doeval = 1; 274 break; 275 case 'C': 276 cls = optarg; 277 break; 278 case 'U': 279 if ((pwd = getpwnam(optarg)) == NULL) { 280 if (!isdigit(*optarg) || 281 (pwd = getpwuid(atoi(optarg))) == NULL) { 282 warnx("invalid user `%s'", optarg); 283 usage(); 284 } 285 } 286 break; 287 case 'H': 288 type = HARD; 289 break; 290 case 'S': 291 type = SOFT; 292 break; 293 case 'B': 294 type = SOFT|HARD; 295 break; 296 default: 297 case ':': /* Without arg */ 298 if ((p = strchr(rcs_string, optopt)) != NULL) { 299 int rcswhich1 = p - rcs_string; 300 if (optarg && *optarg == '-') { /* 'arg' is actually a switch */ 301 --optind; /* back one arg, and make arg NULL */ 302 optarg = NULL; 303 } 304 todo = optarg == NULL ? RCSSEL : RCSSET; 305 if (type == ANY) 306 type = BOTH; 307 which_limits[rcswhich1] = optarg ? type : DISPLAYONLY; 308 set_limits[rcswhich1] = resource_num(rcswhich1, optopt, optarg); 309 num_limits++; 310 break; 311 } 312 /* FALLTHRU */ 313 case '?': 314 usage(); 315 } 316 optarg = NULL; 317 } 318 319 /* If user was specified, get class from that */ 320 if (pwd != NULL) 321 lc = login_getpwclass(pwd); 322 else if (cls != NULL && *cls != '\0') { 323 lc = login_getclassbyname(cls, NULL); 324 if (lc == NULL || strcmp(cls, lc->lc_class) != 0) 325 fprintf(stderr, "login class '%s' non-existent, using %s\n", 326 cls, lc?lc->lc_class:"current settings"); 327 } 328 329 /* If we have a login class, update resource table from that */ 330 if (lc != NULL) { 331 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 332 char str[40]; 333 rlim_t val; 334 335 /* current value overridden by resourcename or resourcename-cur */ 336 sprintf(str, "%s-cur", resources[rcswhich].cap); 337 val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_cur, limits[rcswhich].rlim_cur); 338 limits[rcswhich].rlim_cur = resources[rcswhich].func(lc, str, val, val); 339 /* maximum value overridden by resourcename or resourcename-max */ 340 sprintf(str, "%s-max", resources[rcswhich].cap); 341 val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_max, limits[rcswhich].rlim_max); 342 limits[rcswhich].rlim_max = resources[rcswhich].func(lc, str, val, val); 343 } 344 } 345 346 /* now, let's determine what we wish to do with all this */ 347 348 argv += optind; 349 350 /* If we're setting limits or doing an eval (ie. we're not just 351 * displaying), then check that hard limits are not lower than 352 * soft limits, and force rasing the hard limit if we need to if 353 * we are raising the soft limit, or lower the soft limit if we 354 * are lowering the hard limit. 355 */ 356 if ((*argv || doeval) && getuid() == 0) { 357 358 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 359 if (limits[rcswhich].rlim_max != RLIM_INFINITY) { 360 if (limits[rcswhich].rlim_cur == RLIM_INFINITY) { 361 limits[rcswhich].rlim_max = RLIM_INFINITY; 362 which_limits[rcswhich] |= HARD; 363 } else if (limits[rcswhich].rlim_cur > limits[rcswhich].rlim_max) { 364 if (which_limits[rcswhich] == SOFT) { 365 limits[rcswhich].rlim_max = limits[rcswhich].rlim_cur; 366 which_limits[rcswhich] |= HARD; 367 } else if (which_limits[rcswhich] == HARD) { 368 limits[rcswhich].rlim_cur = limits[rcswhich].rlim_max; 369 which_limits[rcswhich] |= SOFT; 370 } else { 371 /* else.. if we're specifically setting both to 372 * silly values, then let it error out. 373 */ 374 } 375 } 376 } 377 } 378 } 379 380 /* See if we've overridden anything specific on the command line */ 381 if (num_limits && todo == RCSSET) { 382 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 383 if (which_limits[rcswhich] & HARD) 384 limits[rcswhich].rlim_max = set_limits[rcswhich]; 385 if (which_limits[rcswhich] & SOFT) 386 limits[rcswhich].rlim_cur = set_limits[rcswhich]; 387 } 388 } 389 390 /* If *argv is not NULL, then we are being asked to 391 * (perhaps) set environment variables and run a program 392 */ 393 if (*argv) { 394 if (doeval) { 395 warnx("-e cannot be used with `cmd' option"); 396 usage(); 397 } 398 399 login_close(lc); 400 401 /* set leading environment variables, like eval(1) */ 402 while (*argv && (p = strchr(*argv, '='))) 403 (void)setenv(*argv++, ++p, 1); 404 405 /* Set limits */ 406 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 407 if (doall || num_limits == 0 || which_limits[rcswhich] != 0) 408 if (setrlimit(rcswhich, &limits[rcswhich]) == -1) 409 err(1, "setrlimit %s", resources[rcswhich].cap); 410 } 411 412 if (*argv == NULL) 413 usage(); 414 415 execvp(*argv, argv); 416 err(1, "%s", *argv); 417 } 418 419 shelltype = doeval ? getshelltype() : SH_NONE; 420 421 if (type == ANY) /* Default to soft limits */ 422 type = SOFT; 423 424 /* Display limits */ 425 printf(shellparm[shelltype].cmd, 426 lc ? " for class " : " (current)", 427 lc ? lc->lc_class : ""); 428 429 for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) { 430 if (doall || num_limits == 0 || which_limits[rcswhich] != 0) { 431 if (which_limits[rcswhich] == ANY || which_limits[rcswhich]) 432 which_limits[rcswhich] = type; 433 if (shellparm[shelltype].lprm[rcswhich].pfx) { 434 if (shellparm[shelltype].both && limits[rcswhich].rlim_cur == limits[rcswhich].rlim_max) { 435 print_limit(limits[rcswhich].rlim_max, 436 shellparm[shelltype].lprm[rcswhich].divisor, 437 shellparm[shelltype].inf, 438 shellparm[shelltype].lprm[rcswhich].pfx, 439 shellparm[shelltype].lprm[rcswhich].sfx, 440 shellparm[shelltype].both); 441 } else { 442 if (which_limits[rcswhich] & HARD) { 443 print_limit(limits[rcswhich].rlim_max, 444 shellparm[shelltype].lprm[rcswhich].divisor, 445 shellparm[shelltype].inf, 446 shellparm[shelltype].lprm[rcswhich].pfx, 447 shellparm[shelltype].lprm[rcswhich].sfx, 448 shellparm[shelltype].hard); 449 } 450 if (which_limits[rcswhich] & SOFT) { 451 print_limit(limits[rcswhich].rlim_cur, 452 shellparm[shelltype].lprm[rcswhich].divisor, 453 shellparm[shelltype].inf, 454 shellparm[shelltype].lprm[rcswhich].pfx, 455 shellparm[shelltype].lprm[rcswhich].sfx, 456 shellparm[shelltype].soft); 457 } 458 } 459 } 460 } 461 } 462 463 login_close(lc); 464 exit(EXIT_SUCCESS); 465 } 466 467 468 static void 469 usage(void) 470 { 471 (void)fprintf(stderr, 472 "usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuv [val]] [[name=val ...] cmd]\n"); 473 exit(EXIT_FAILURE); 474 } 475 476 static void 477 print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which) 478 { 479 char numbr[64]; 480 481 if (limit == RLIM_INFINITY) 482 strcpy(numbr, inf); 483 else 484 sprintf(numbr, "%jd", (intmax_t)((limit + divisor/2) / divisor)); 485 printf(pfx, which, numbr); 486 printf(sfx, which); 487 488 } 489 490 491 static rlim_t 492 resource_num(int which, int ch, const char *str) 493 { 494 rlim_t res = RLIM_INFINITY; 495 496 if (str != NULL && 497 !(strcasecmp(str, "inf") == 0 || 498 strcasecmp(str, "infinity") == 0 || 499 strcasecmp(str, "unlimit") == 0 || 500 strcasecmp(str, "unlimited") == 0)) { 501 const char * s = str; 502 char *e; 503 504 switch (which) { 505 case RLIMIT_CPU: /* time values */ 506 errno = 0; 507 res = 0; 508 while (*s) { 509 rlim_t tim = strtoq(s, &e, 0); 510 if (e == NULL || e == s || errno) 511 break; 512 switch (*e++) { 513 case 0: /* end of string */ 514 e--; 515 default: 516 case 's': case 'S': /* seconds */ 517 break; 518 case 'm': case 'M': /* minutes */ 519 tim *= 60L; 520 break; 521 case 'h': case 'H': /* hours */ 522 tim *= (60L * 60L); 523 break; 524 case 'd': case 'D': /* days */ 525 tim *= (60L * 60L * 24L); 526 break; 527 case 'w': case 'W': /* weeks */ 528 tim *= (60L * 60L * 24L * 7L); 529 case 'y': case 'Y': /* Years */ 530 tim *= (60L * 60L * 24L * 365L); 531 } 532 s = e; 533 res += tim; 534 } 535 break; 536 case RLIMIT_FSIZE: /* Size values */ 537 case RLIMIT_DATA: 538 case RLIMIT_STACK: 539 case RLIMIT_CORE: 540 case RLIMIT_RSS: 541 case RLIMIT_MEMLOCK: 542 case RLIMIT_SBSIZE: 543 case RLIMIT_VMEM: 544 errno = 0; 545 res = 0; 546 while (*s) { 547 rlim_t mult, tim = strtoq(s, &e, 0); 548 if (e == NULL || e == s || errno) 549 break; 550 switch (*e++) { 551 case 0: /* end of string */ 552 e--; 553 default: 554 mult = 1; 555 break; 556 case 'b': case 'B': /* 512-byte blocks */ 557 mult = 512; 558 break; 559 case 'k': case 'K': /* 1024-byte Kilobytes */ 560 mult = 1024; 561 break; 562 case 'm': case 'M': /* 1024-k kbytes */ 563 mult = 1024 * 1024; 564 break; 565 case 'g': case 'G': /* 1Gbyte */ 566 mult = 1024 * 1024 * 1024; 567 break; 568 case 't': case 'T': /* 1TBte */ 569 mult = 1024LL * 1024LL * 1024LL * 1024LL; 570 break; 571 } 572 s = e; 573 res += (tim * mult); 574 } 575 break; 576 case RLIMIT_NPROC: 577 case RLIMIT_NOFILE: 578 res = strtoq(s, &e, 0); 579 s = e; 580 break; 581 } 582 if (*s) { 583 warnx("invalid value -%c `%s'", ch, str); 584 usage(); 585 } 586 } 587 return res; 588 } 589 590 591 static int 592 getshellbyname(const char * shell) 593 { 594 int i; 595 const char * q; 596 const char * p = strrchr(shell, '/'); 597 598 p = p ? p+1 : shell; 599 for (i = 0; (q = shellparm[i].name) != NULL; i++) { 600 while (*q) { 601 int j = strcspn(q, "|"); 602 603 if (j == 0) 604 break; 605 if (strncmp(p, q, j) == 0) 606 return i; 607 if (*(q += j)) 608 ++q; 609 } 610 } 611 return SH_SH; 612 } 613 614 615 /* 616 * Determine the type of shell our parent process is 617 * This is quite tricky, not 100% reliable and probably 618 * not nearly as thorough as it should be. Basically, this 619 * is a "best guess" only, but hopefully will work in 620 * most cases. 621 */ 622 623 static int 624 getshelltype(void) 625 { 626 pid_t ppid = getppid(); 627 628 if (ppid != 1) { 629 FILE * fp; 630 struct stat st; 631 char procdir[MAXPATHLEN], buf[128]; 632 int l = sprintf(procdir, "/proc/%ld/", (long)ppid); 633 char * shell = getenv("SHELL"); 634 635 if (shell != NULL && stat(shell, &st) != -1) { 636 struct stat st1; 637 638 strcpy(procdir+l, "file"); 639 /* $SHELL is actual shell? */ 640 if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0) 641 return getshellbyname(shell); 642 } 643 strcpy(procdir+l, "status"); 644 if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) { 645 char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t"); 646 fclose(fp); 647 if (p != NULL) 648 return getshellbyname(p); 649 } 650 } 651 return SH_SH; 652 } 653 654