1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Sean Eric Fagan of Cygnus Support. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/time.h> 45 #include <sys/sysctl.h> 46 #include <sys/resource.h> 47 #include <sys/socket.h> 48 49 #include <errno.h> 50 #include <limits.h> 51 #include <paths.h> 52 #include <pthread.h> /* we just need the limits */ 53 #include <time.h> 54 #include <unistd.h> 55 56 #include "../stdlib/atexit.h" 57 #include "../stdtime/tzfile.h" 58 59 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */ 60 61 /* 62 * sysconf -- 63 * get configurable system variables. 64 * 65 * XXX 66 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 67 * not change during the lifetime of the calling process. This would seem 68 * to require that any change to system limits kill all running processes. 69 * A workaround might be to cache the values when they are first retrieved 70 * and then simply return the cached value on subsequent calls. This is 71 * less useful than returning up-to-date values, however. 72 */ 73 long 74 sysconf(name) 75 int name; 76 { 77 struct rlimit rl; 78 size_t len; 79 int mib[2], sverrno, value; 80 long defaultresult; 81 const char *path; 82 83 len = sizeof(value); 84 defaultresult = -1; 85 86 switch (name) { 87 case _SC_ARG_MAX: 88 mib[0] = CTL_KERN; 89 mib[1] = KERN_ARGMAX; 90 break; 91 case _SC_CHILD_MAX: 92 if (getrlimit(RLIMIT_NPROC, &rl) != 0) 93 return (-1); 94 if (rl.rlim_cur == RLIM_INFINITY) 95 return (-1); 96 if (rl.rlim_cur > LONG_MAX) { 97 errno = EOVERFLOW; 98 return (-1); 99 } 100 return ((long)rl.rlim_cur); 101 case _SC_CLK_TCK: 102 return (CLK_TCK); 103 case _SC_NGROUPS_MAX: 104 mib[0] = CTL_KERN; 105 mib[1] = KERN_NGROUPS; 106 break; 107 case _SC_OPEN_MAX: 108 case _SC_STREAM_MAX: /* assume fds run out before memory does */ 109 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 110 return (-1); 111 if (rl.rlim_cur == RLIM_INFINITY) 112 return (-1); 113 if (rl.rlim_cur > LONG_MAX) { 114 errno = EOVERFLOW; 115 return (-1); 116 } 117 return ((long)rl.rlim_cur); 118 case _SC_JOB_CONTROL: 119 return (_POSIX_JOB_CONTROL); 120 case _SC_SAVED_IDS: 121 /* XXX - must be 1 */ 122 mib[0] = CTL_KERN; 123 mib[1] = KERN_SAVED_IDS; 124 goto yesno; 125 case _SC_VERSION: 126 mib[0] = CTL_KERN; 127 mib[1] = KERN_POSIX1; 128 break; 129 case _SC_BC_BASE_MAX: 130 return (BC_BASE_MAX); 131 case _SC_BC_DIM_MAX: 132 return (BC_DIM_MAX); 133 case _SC_BC_SCALE_MAX: 134 return (BC_SCALE_MAX); 135 case _SC_BC_STRING_MAX: 136 return (BC_STRING_MAX); 137 case _SC_COLL_WEIGHTS_MAX: 138 return (COLL_WEIGHTS_MAX); 139 case _SC_EXPR_NEST_MAX: 140 return (EXPR_NEST_MAX); 141 case _SC_LINE_MAX: 142 return (LINE_MAX); 143 case _SC_RE_DUP_MAX: 144 return (RE_DUP_MAX); 145 case _SC_2_VERSION: 146 /* 147 * This is something of a lie, but it would be silly at 148 * this point to try to deduce this from the contents 149 * of the filesystem. 150 */ 151 return (_POSIX2_VERSION); 152 case _SC_2_C_BIND: 153 return (_POSIX2_C_BIND); 154 case _SC_2_C_DEV: 155 return (_POSIX2_C_DEV); 156 case _SC_2_CHAR_TERM: 157 return (_POSIX2_CHAR_TERM); 158 case _SC_2_FORT_DEV: 159 return (_POSIX2_FORT_DEV); 160 case _SC_2_FORT_RUN: 161 return (_POSIX2_FORT_RUN); 162 case _SC_2_LOCALEDEF: 163 return (_POSIX2_LOCALEDEF); 164 case _SC_2_SW_DEV: 165 return (_POSIX2_SW_DEV); 166 case _SC_2_UPE: 167 return (_POSIX2_UPE); 168 case _SC_TZNAME_MAX: 169 path = _PATH_ZONEINFO; 170 do_NAME_MAX: 171 sverrno = errno; 172 errno = 0; 173 value = pathconf(path, _PC_NAME_MAX); 174 if (value == -1 && errno != 0) 175 return (-1); 176 errno = sverrno; 177 return (value); 178 179 case _SC_ASYNCHRONOUS_IO: 180 #if _POSIX_ASYNCHRONOUS_IO == 0 181 mib[0] = CTL_P1003_1B; 182 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; 183 break; 184 #else 185 return (_POSIX_ASYNCHRONOUS_IO); 186 #endif 187 case _SC_MAPPED_FILES: 188 return (_POSIX_MAPPED_FILES); 189 case _SC_MEMLOCK: 190 return (_POSIX_MEMLOCK); 191 case _SC_MEMLOCK_RANGE: 192 return (_POSIX_MEMLOCK_RANGE); 193 case _SC_MEMORY_PROTECTION: 194 return (_POSIX_MEMORY_PROTECTION); 195 case _SC_MESSAGE_PASSING: 196 #if _POSIX_MESSAGE_PASSING == 0 197 mib[0] = CTL_P1003_1B; 198 mib[1] = CTL_P1003_1B_MESSAGE_PASSING; 199 goto yesno; 200 #else 201 return (_POSIX_MESSAGE_PASSING); 202 #endif 203 case _SC_PRIORITIZED_IO: 204 #if _POSIX_PRIORITIZED_IO == 0 205 mib[0] = CTL_P1003_1B; 206 mib[1] = CTL_P1003_1B_PRIORITIZED_IO; 207 goto yesno; 208 #else 209 return (_POSIX_PRIORITIZED_IO); 210 #endif 211 case _SC_PRIORITY_SCHEDULING: 212 #if _POSIX_PRIORITY_SCHEDULING == 0 213 mib[0] = CTL_P1003_1B; 214 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; 215 goto yesno; 216 #else 217 return (_POSIX_PRIORITY_SCHEDULING); 218 #endif 219 case _SC_REALTIME_SIGNALS: 220 #if _POSIX_REALTIME_SIGNALS == 0 221 mib[0] = CTL_P1003_1B; 222 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; 223 goto yesno; 224 #else 225 return (_POSIX_REALTIME_SIGNALS); 226 #endif 227 case _SC_SEMAPHORES: 228 #if _POSIX_SEMAPHORES == 0 229 mib[0] = CTL_P1003_1B; 230 mib[1] = CTL_P1003_1B_SEMAPHORES; 231 goto yesno; 232 #else 233 return (_POSIX_SEMAPHORES); 234 #endif 235 case _SC_FSYNC: 236 return (_POSIX_FSYNC); 237 238 case _SC_SHARED_MEMORY_OBJECTS: 239 return (_POSIX_SHARED_MEMORY_OBJECTS); 240 case _SC_SYNCHRONIZED_IO: 241 #if _POSIX_SYNCHRONIZED_IO == 0 242 mib[0] = CTL_P1003_1B; 243 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; 244 goto yesno; 245 #else 246 return (_POSIX_SYNCHRONIZED_IO); 247 #endif 248 case _SC_TIMERS: 249 #if _POSIX_TIMERS == 0 250 mib[0] = CTL_P1003_1B; 251 mib[1] = CTL_P1003_1B_TIMERS; 252 goto yesno; 253 #else 254 return (_POSIX_TIMERS); 255 #endif 256 case _SC_AIO_LISTIO_MAX: 257 defaultresult = _POSIX_AIO_LISTIO_MAX; 258 mib[0] = CTL_P1003_1B; 259 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; 260 goto yesno; 261 case _SC_AIO_MAX: 262 defaultresult = _POSIX_AIO_MAX; 263 mib[0] = CTL_P1003_1B; 264 mib[1] = CTL_P1003_1B_AIO_MAX; 265 goto yesno; 266 case _SC_AIO_PRIO_DELTA_MAX: 267 defaultresult = 0; 268 mib[0] = CTL_P1003_1B; 269 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; 270 goto yesno; 271 case _SC_DELAYTIMER_MAX: 272 mib[0] = CTL_P1003_1B; 273 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; 274 goto yesno; 275 case _SC_MQ_OPEN_MAX: 276 mib[0] = CTL_P1003_1B; 277 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX; 278 goto yesno; 279 case _SC_PAGESIZE: 280 defaultresult = getpagesize(); 281 mib[0] = CTL_P1003_1B; 282 mib[1] = CTL_P1003_1B_PAGESIZE; 283 goto yesno; 284 case _SC_RTSIG_MAX: 285 mib[0] = CTL_P1003_1B; 286 mib[1] = CTL_P1003_1B_RTSIG_MAX; 287 goto yesno; 288 case _SC_SEM_NSEMS_MAX: 289 mib[0] = CTL_P1003_1B; 290 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX; 291 goto yesno; 292 case _SC_SEM_VALUE_MAX: 293 mib[0] = CTL_P1003_1B; 294 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX; 295 goto yesno; 296 case _SC_SIGQUEUE_MAX: 297 mib[0] = CTL_P1003_1B; 298 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; 299 goto yesno; 300 case _SC_TIMER_MAX: 301 mib[0] = CTL_P1003_1B; 302 mib[1] = CTL_P1003_1B_TIMER_MAX; 303 304 yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 305 return (-1); 306 if (value == 0) 307 return (defaultresult); 308 return (value); 309 310 case _SC_2_PBS: 311 case _SC_2_PBS_ACCOUNTING: 312 case _SC_2_PBS_CHECKPOINT: 313 case _SC_2_PBS_LOCATE: 314 case _SC_2_PBS_MESSAGE: 315 case _SC_2_PBS_TRACK: 316 #if _POSIX2_PBS == 0 317 #error "don't know how to determine _SC_2_PBS" 318 /* 319 * This probably requires digging through the filesystem 320 * to see if the appropriate package has been installed. 321 * Since we don't currently support this option at all, 322 * it's not worth the effort to write the code now. 323 * Figuring out which of the sub-options are supported 324 * would be even more difficult, so it's probably easier 325 * to always say ``no''. 326 */ 327 #else 328 return (_POSIX2_PBS); 329 #endif 330 case _SC_ADVISORY_INFO: 331 #if _POSIX_ADVISORY_INFO == 0 332 #error "_POSIX_ADVISORY_INFO" 333 #else 334 return (_POSIX_ADVISORY_INFO); 335 #endif 336 case _SC_BARRIERS: 337 #if _POSIX_BARRIERS == 0 338 #error "_POSIX_BARRIERS" 339 #else 340 return (_POSIX_BARRIERS); 341 #endif 342 case _SC_CLOCK_SELECTION: 343 #if _POSIX_CLOCK_SELECTION == 0 344 #error "_POSIX_CLOCK_SELECTION" 345 #else 346 return (_POSIX_CLOCK_SELECTION); 347 #endif 348 case _SC_CPUTIME: 349 #if _POSIX_CPUTIME == 0 350 #error "_POSIX_CPUTIME" 351 #else 352 return (_POSIX_CPUTIME); 353 #endif 354 #ifdef notdef 355 case _SC_FILE_LOCKING: 356 /* 357 * XXX - The standard doesn't tell us how to define 358 * _POSIX_FILE_LOCKING, so we can't answer this one. 359 */ 360 #endif 361 #if _POSIX_THREAD_SAFE_FUNCTIONS > -1 362 case _SC_GETGR_R_SIZE_MAX: 363 case _SC_GETPW_R_SIZE_MAX: 364 #error "somebody needs to implement this" 365 #endif 366 case _SC_HOST_NAME_MAX: 367 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 368 case _SC_LOGIN_NAME_MAX: 369 return (MAXLOGNAME); 370 case _SC_MONOTONIC_CLOCK: 371 #if _POSIX_MONOTONIC_CLOCK == 0 372 #error "_POSIX_MONOTONIC_CLOCK" 373 #else 374 return (_POSIX_MONOTONIC_CLOCK); 375 #endif 376 #if _POSIX_MESSAGE_PASSING > -1 377 case _SC_MQ_PRIO_MAX: 378 return (MQ_PRIO_MAX); 379 #endif 380 case _SC_READER_WRITER_LOCKS: 381 return (_POSIX_READER_WRITER_LOCKS); 382 case _SC_REGEXP: 383 return (_POSIX_REGEXP); 384 case _SC_SHELL: 385 return (_POSIX_SHELL); 386 case _SC_SPAWN: 387 return (_POSIX_SPAWN); 388 case _SC_SPIN_LOCKS: 389 return (_POSIX_SPIN_LOCKS); 390 case _SC_SPORADIC_SERVER: 391 #if _POSIX_SPORADIC_SERVER == 0 392 #error "_POSIX_SPORADIC_SERVER" 393 #else 394 return (_POSIX_SPORADIC_SERVER); 395 #endif 396 case _SC_THREAD_ATTR_STACKADDR: 397 return (_POSIX_THREAD_ATTR_STACKADDR); 398 case _SC_THREAD_ATTR_STACKSIZE: 399 return (_POSIX_THREAD_ATTR_STACKSIZE); 400 case _SC_THREAD_CPUTIME: 401 return (_POSIX_THREAD_CPUTIME); 402 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 403 return (PTHREAD_DESTRUCTOR_ITERATIONS); 404 case _SC_THREAD_KEYS_MAX: 405 return (PTHREAD_KEYS_MAX); 406 case _SC_THREAD_PRIO_INHERIT: 407 return (_POSIX_THREAD_PRIO_INHERIT); 408 case _SC_THREAD_PRIO_PROTECT: 409 return (_POSIX_THREAD_PRIO_PROTECT); 410 case _SC_THREAD_PRIORITY_SCHEDULING: 411 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 412 case _SC_THREAD_PROCESS_SHARED: 413 return (_POSIX_THREAD_PROCESS_SHARED); 414 case _SC_THREAD_SAFE_FUNCTIONS: 415 return (_POSIX_THREAD_SAFE_FUNCTIONS); 416 case _SC_THREAD_STACK_MIN: 417 return (PTHREAD_STACK_MIN); 418 case _SC_THREAD_THREADS_MAX: 419 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */ 420 case _SC_TIMEOUTS: 421 return (_POSIX_TIMEOUTS); 422 case _SC_THREADS: 423 return (_POSIX_THREADS); 424 case _SC_TRACE: 425 #if _POSIX_TRACE == 0 426 #error "_POSIX_TRACE" 427 /* While you're implementing this, also do the ones below. */ 428 #else 429 return (_POSIX_TRACE); 430 #endif 431 #if _POSIX_TRACE > -1 432 case _SC_TRACE_EVENT_FILTER: 433 return (_POSIX_TRACE_EVENT_FILTER); 434 case _SC_TRACE_INHERIT: 435 return (_POSIX_TRACE_INHERIT); 436 case _SC_TRACE_LOG: 437 return (_POSIX_TRACE_LOG); 438 #endif 439 case _SC_TTY_NAME_MAX: 440 path = _PATH_DEV; 441 goto do_NAME_MAX; 442 case _SC_TYPED_MEMORY_OBJECTS: 443 #if _POSIX_TYPED_MEMORY_OBJECTS == 0 444 #error "_POSIX_TYPED_MEMORY_OBJECTS" 445 #else 446 return (_POSIX_TYPED_MEMORY_OBJECTS); 447 #endif 448 case _SC_V6_ILP32_OFF32: 449 #if _V6_ILP32_OFF32 == 0 450 if (sizeof(int) * CHAR_BIT == 32 && 451 sizeof(int) == sizeof(long) && 452 sizeof(long) == sizeof(void *) && 453 sizeof(void *) == sizeof(off_t)) 454 return 1; 455 else 456 return -1; 457 #else 458 return (_V6_ILP32_OFF32); 459 #endif 460 case _SC_V6_ILP32_OFFBIG: 461 #if _V6_ILP32_OFFBIG == 0 462 if (sizeof(int) * CHAR_BIT == 32 && 463 sizeof(int) == sizeof(long) && 464 sizeof(long) == sizeof(void *) && 465 sizeof(off_t) * CHAR_BIT >= 64) 466 return 1; 467 else 468 return -1; 469 #else 470 return (_V6_ILP32_OFFBIG); 471 #endif 472 case _SC_V6_LP64_OFF64: 473 #if _V6_LP64_OFF64 == 0 474 if (sizeof(int) * CHAR_BIT == 32 && 475 sizeof(long) * CHAR_BIT == 64 && 476 sizeof(long) == sizeof(void *) && 477 sizeof(void *) == sizeof(off_t)) 478 return 1; 479 else 480 return -1; 481 #else 482 return (_V6_LP64_OFF64); 483 #endif 484 case _SC_V6_LPBIG_OFFBIG: 485 #if _V6_LPBIG_OFFBIG == 0 486 if (sizeof(int) * CHAR_BIT >= 32 && 487 sizeof(long) * CHAR_BIT >= 64 && 488 sizeof(void *) * CHAR_BIT >= 64 && 489 sizeof(off_t) * CHAR_BIT >= 64) 490 return 1; 491 else 492 return -1; 493 #else 494 return (_V6_LPBIG_OFFBIG); 495 #endif 496 case _SC_ATEXIT_MAX: 497 return (ATEXIT_SIZE); 498 case _SC_IOV_MAX: 499 mib[0] = CTL_KERN; 500 mib[1] = KERN_IOV_MAX; 501 break; 502 case _SC_XOPEN_CRYPT: 503 return (_XOPEN_CRYPT); 504 case _SC_XOPEN_ENH_I18N: 505 return (_XOPEN_ENH_I18N); 506 case _SC_XOPEN_LEGACY: 507 return (_XOPEN_LEGACY); 508 case _SC_XOPEN_REALTIME: 509 #if _XOPEN_REALTIME == 0 510 sverrno = errno; 511 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 && 512 sysconf(_SC_MEMLOCK) > 0 && 513 sysconf(_SC_MEMLOCK_RANGE) > 0 && 514 sysconf(_SC_MESSAGE_PASSING) > 0 && 515 sysconf(_SC_PRIORITY_SCHEDULING) > 0 && 516 sysconf(_SC_REALTIME_SIGNALS) > 0 && 517 sysconf(_SC_SEMAPHORES) > 0 && 518 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 && 519 sysconf(_SC_SYNCHRONIZED_IO) > 0 && 520 sysconf(_SC_TIMERS) > 0; 521 errno = sverrno; 522 if (value) 523 return (200112L); 524 else 525 return (-1); 526 #else 527 return (_XOPEN_REALTIME); 528 #endif 529 case _SC_XOPEN_REALTIME_THREADS: 530 #if _XOPEN_REALTIME_THREADS == 0 531 #error "_XOPEN_REALTIME_THREADS" 532 #else 533 return (_XOPEN_REALTIME_THREADS); 534 #endif 535 case _SC_XOPEN_SHM: 536 sverrno = errno; 537 if (sysctlbyname("kern.ipc.shmmin", &value, &len, NULL, 538 0) == -1) { 539 errno = sverrno; 540 return (-1); 541 } 542 errno = sverrno; 543 return (1); 544 case _SC_XOPEN_STREAMS: 545 return (_XOPEN_STREAMS); 546 case _SC_XOPEN_UNIX: 547 return (_XOPEN_UNIX); 548 #ifdef _XOPEN_VERSION 549 case _SC_XOPEN_VERSION: 550 return (_XOPEN_VERSION); 551 #endif 552 #ifdef _XOPEN_XCU_VERSION 553 case _SC_XOPEN_XCU_VERSION: 554 return (_XOPEN_XCU_VERSION); 555 #endif 556 case _SC_SYMLOOP_MAX: 557 return (MAXSYMLINKS); 558 case _SC_RAW_SOCKETS: 559 return (_POSIX_RAW_SOCKETS); 560 case _SC_IPV6: 561 #if _POSIX_IPV6 == 0 562 sverrno = errno; 563 value = socket(PF_INET6, SOCK_DGRAM, 0); 564 errno = sverrno; 565 if (value >= 0) { 566 close(value); 567 return (200112L); 568 } else 569 return (0); 570 #else 571 return (_POSIX_IPV6); 572 #endif 573 574 case _SC_NPROCESSORS_CONF: 575 case _SC_NPROCESSORS_ONLN: 576 mib[0] = CTL_HW; 577 mib[1] = HW_NCPU; 578 break; 579 580 default: 581 errno = EINVAL; 582 return (-1); 583 } 584 return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); 585 } 586