1 /* $OpenBSD: sysconf.c,v 1.17 2012/08/29 21:46:29 matthew Exp $ */ 2 /*- 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Sean Eric Fagan of Cygnus Support. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/sem.h> 36 #include <sys/sysctl.h> 37 #include <sys/time.h> 38 #include <sys/resource.h> 39 #include <sys/vmmeter.h> 40 #include <sys/socket.h> 41 42 #include <errno.h> 43 #include <grp.h> 44 #include <pthread.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <unistd.h> 48 49 /* 50 * sysconf -- 51 * get configurable system variables. 52 * 53 * XXX 54 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 55 * not change during the lifetime of the calling process. This would seem 56 * to require that any change to system limits kill all running processes. 57 * A workaround might be to cache the values when they are first retrieved 58 * and then simply return the cached value on subsequent calls. This is 59 * less useful than returning up-to-date values, however. 60 */ 61 long 62 sysconf(int name) 63 { 64 struct rlimit rl; 65 size_t len; 66 int mib[3], value, namelen, sverrno; 67 68 len = sizeof(value); 69 namelen = 2; 70 71 switch (name) { 72 /* 1003.1 */ 73 case _SC_ARG_MAX: 74 mib[0] = CTL_KERN; 75 mib[1] = KERN_ARGMAX; 76 break; 77 case _SC_CHILD_MAX: 78 if (getrlimit(RLIMIT_NPROC, &rl) != 0) 79 return (-1); 80 if (rl.rlim_cur == RLIM_INFINITY) 81 return (-1); 82 if (rl.rlim_cur > LONG_MAX) { 83 errno = EOVERFLOW; 84 return (-1); 85 } 86 return ((long)rl.rlim_cur); 87 case _SC_CLK_TCK: 88 return (CLK_TCK); 89 case _SC_JOB_CONTROL: 90 return (_POSIX_JOB_CONTROL); 91 case _SC_NGROUPS_MAX: 92 mib[0] = CTL_KERN; 93 mib[1] = KERN_NGROUPS; 94 break; 95 case _SC_OPEN_MAX: 96 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 97 return (-1); 98 if (rl.rlim_cur == RLIM_INFINITY) 99 return (-1); 100 if (rl.rlim_cur > LONG_MAX) { 101 errno = EOVERFLOW; 102 return (-1); 103 } 104 return ((long)rl.rlim_cur); 105 case _SC_STREAM_MAX: 106 if (getrlimit(RLIMIT_NOFILE, &rl) != 0) 107 return (-1); 108 if (rl.rlim_cur == RLIM_INFINITY) 109 return (-1); 110 if (rl.rlim_cur > LONG_MAX) { 111 errno = EOVERFLOW; 112 return (-1); 113 } 114 /* 115 * struct __sFILE currently has a limitation that 116 * file descriptors must fit in a signed short. 117 * This doesn't precisely capture the letter of POSIX 118 * but approximates the spirit. 119 */ 120 if (rl.rlim_cur > SHRT_MAX) 121 return (SHRT_MAX); 122 123 return ((long)rl.rlim_cur); 124 case _SC_TZNAME_MAX: 125 return (NAME_MAX); 126 case _SC_SAVED_IDS: 127 return (_POSIX_SAVED_IDS); 128 case _SC_VERSION: 129 mib[0] = CTL_KERN; 130 mib[1] = KERN_POSIX1; 131 break; 132 133 /* 1003.1b */ 134 case _SC_PAGESIZE: 135 mib[0] = CTL_HW; 136 mib[1] = HW_PAGESIZE; 137 break; 138 case _SC_FSYNC: 139 return (_POSIX_FSYNC); 140 141 /* 1003.1c */ 142 case _SC_LOGIN_NAME_MAX: 143 return (LOGIN_NAME_MAX); 144 145 case _SC_THREAD_SAFE_FUNCTIONS: 146 return (_POSIX_THREAD_SAFE_FUNCTIONS); 147 148 case _SC_GETGR_R_SIZE_MAX: 149 return (_GR_BUF_LEN); 150 151 case _SC_GETPW_R_SIZE_MAX: 152 return (_PW_BUF_LEN); 153 154 /* 1003.2 */ 155 case _SC_BC_BASE_MAX: 156 return (BC_BASE_MAX); 157 case _SC_BC_DIM_MAX: 158 return (BC_DIM_MAX); 159 case _SC_BC_SCALE_MAX: 160 return (BC_SCALE_MAX); 161 case _SC_BC_STRING_MAX: 162 return (BC_STRING_MAX); 163 case _SC_COLL_WEIGHTS_MAX: 164 return (COLL_WEIGHTS_MAX); 165 case _SC_EXPR_NEST_MAX: 166 return (EXPR_NEST_MAX); 167 case _SC_LINE_MAX: 168 return (LINE_MAX); 169 case _SC_RE_DUP_MAX: 170 return (RE_DUP_MAX); 171 case _SC_2_VERSION: 172 return (_POSIX2_VERSION); 173 case _SC_2_C_BIND: 174 return (_POSIX2_C_BIND); 175 case _SC_2_C_DEV: 176 return (_POSIX2_C_DEV); 177 case _SC_2_CHAR_TERM: 178 return (_POSIX2_CHAR_TERM); 179 case _SC_2_FORT_DEV: 180 return (_POSIX2_FORT_DEV); 181 case _SC_2_FORT_RUN: 182 return (_POSIX2_FORT_RUN); 183 case _SC_2_LOCALEDEF: 184 return (_POSIX2_LOCALEDEF); 185 case _SC_2_SW_DEV: 186 return (_POSIX2_SW_DEV); 187 case _SC_2_UPE: 188 return (_POSIX2_UPE); 189 190 /* XPG 4.2 */ 191 case _SC_XOPEN_SHM: 192 mib[0] = CTL_KERN; 193 mib[1] = KERN_SYSVSHM; 194 if (sysctl(mib, namelen, &value, &len, NULL, 0) == -1) 195 return (-1); 196 if (value == 0) 197 return (-1); 198 return (value); 199 break; 200 case _SC_SEM_NSEMS_MAX: 201 case _SC_SEM_VALUE_MAX: 202 mib[0] = CTL_KERN; 203 mib[1] = KERN_SEMINFO; 204 mib[2] = name = _SC_SEM_NSEMS_MAX ? 205 KERN_SEMINFO_SEMMNS : KERN_SEMINFO_SEMVMX; 206 namelen = 3; 207 break; 208 209 /* Unsorted */ 210 case _SC_HOST_NAME_MAX: 211 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 212 case _SC_MONOTONIC_CLOCK: 213 return (_POSIX_MONOTONIC_CLOCK); 214 case _SC_2_PBS: 215 case _SC_2_PBS_ACCOUNTING: 216 case _SC_2_PBS_CHECKPOINT: 217 case _SC_2_PBS_LOCATE: 218 case _SC_2_PBS_MESSAGE: 219 case _SC_2_PBS_TRACK: 220 return (_POSIX2_PBS); 221 case _SC_ADVISORY_INFO: 222 return (_POSIX_ADVISORY_INFO); 223 case _SC_AIO_LISTIO_MAX: 224 case _SC_AIO_MAX: 225 case _SC_AIO_PRIO_DELTA_MAX: 226 return (-1); 227 case _SC_ASYNCHRONOUS_IO: 228 return (_POSIX_ASYNCHRONOUS_IO); 229 case _SC_ATEXIT_MAX: 230 return (-1); 231 case _SC_BARRIERS: 232 return (_POSIX_BARRIERS); 233 case _SC_CLOCK_SELECTION: 234 return (_POSIX_CLOCK_SELECTION); 235 case _SC_CPUTIME: 236 return (_POSIX_CPUTIME); 237 case _SC_DELAYTIMER_MAX: 238 return (-1); 239 case _SC_IOV_MAX: 240 return (IOV_MAX); 241 case _SC_IPV6: 242 #if _POSIX_IPV6 == 0 243 sverrno = errno; 244 value = socket(PF_INET6, SOCK_DGRAM, 0); 245 errno = sverrno; 246 if (value >= 0) { 247 close(value); 248 return (200112L); 249 } else 250 return (0); 251 #else 252 return (_POSIX_IPV6); 253 #endif 254 case _SC_MAPPED_FILES: 255 return (_POSIX_MAPPED_FILES); 256 case _SC_MEMLOCK: 257 return (_POSIX_MEMLOCK); 258 case _SC_MEMLOCK_RANGE: 259 return (_POSIX_MEMLOCK_RANGE); 260 case _SC_MEMORY_PROTECTION: 261 return (_POSIX_MEMORY_PROTECTION); 262 case _SC_MESSAGE_PASSING: 263 return (_POSIX_MESSAGE_PASSING); 264 case _SC_PRIORITIZED_IO: 265 return (_POSIX_PRIORITIZED_IO); 266 case _SC_PRIORITY_SCHEDULING: 267 return (_POSIX_PRIORITY_SCHEDULING); 268 case _SC_RAW_SOCKETS: 269 return (_POSIX_RAW_SOCKETS); 270 case _SC_READER_WRITER_LOCKS: 271 return (_POSIX_READER_WRITER_LOCKS); 272 case _SC_REALTIME_SIGNALS: 273 return (_POSIX_REALTIME_SIGNALS); 274 case _SC_REGEXP: 275 return (_POSIX_REGEXP); 276 case _SC_SEMAPHORES: 277 return (_POSIX_SEMAPHORES); 278 case _SC_SHARED_MEMORY_OBJECTS: 279 return (_POSIX_SHARED_MEMORY_OBJECTS); 280 case _SC_SHELL: 281 return (_POSIX_SHELL); 282 case _SC_SIGQUEUE_MAX: 283 return (-1); 284 case _SC_SPAWN: 285 return (_POSIX_SPAWN); 286 case _SC_SPIN_LOCKS: 287 return (_POSIX_SPIN_LOCKS); 288 case _SC_SPORADIC_SERVER: 289 return (_POSIX_SPORADIC_SERVER); 290 case _SC_SYNCHRONIZED_IO: 291 return (_POSIX_SYNCHRONIZED_IO); 292 case _SC_SYMLOOP_MAX: 293 return (SYMLOOP_MAX); 294 case _SC_THREAD_ATTR_STACKADDR: 295 return (_POSIX_THREAD_ATTR_STACKADDR); 296 case _SC_THREAD_ATTR_STACKSIZE: 297 return (_POSIX_THREAD_ATTR_STACKSIZE); 298 case _SC_THREAD_CPUTIME: 299 return (_POSIX_THREAD_CPUTIME); 300 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 301 return (PTHREAD_DESTRUCTOR_ITERATIONS); 302 case _SC_THREAD_KEYS_MAX: 303 return (PTHREAD_KEYS_MAX); 304 case _SC_THREAD_PRIO_INHERIT: 305 return (_POSIX_THREAD_PRIO_INHERIT); 306 case _SC_THREAD_PRIO_PROTECT: 307 return (_POSIX_THREAD_PRIO_PROTECT); 308 case _SC_THREAD_PRIORITY_SCHEDULING: 309 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 310 case _SC_THREAD_PROCESS_SHARED: 311 return (_POSIX_THREAD_PROCESS_SHARED); 312 case _SC_THREAD_ROBUST_PRIO_INHERIT: 313 return (_POSIX_THREAD_ROBUST_PRIO_INHERIT); 314 case _SC_THREAD_ROBUST_PRIO_PROTECT: 315 return (_POSIX_THREAD_ROBUST_PRIO_PROTECT); 316 case _SC_THREAD_SPORADIC_SERVER: 317 return (_POSIX_THREAD_SPORADIC_SERVER); 318 case _SC_THREAD_STACK_MIN: 319 return (PTHREAD_STACK_MIN); 320 case _SC_THREAD_THREADS_MAX: 321 return (PTHREAD_THREADS_MAX); 322 case _SC_THREADS: 323 return (_POSIX_THREADS); 324 case _SC_TIMEOUTS: 325 return (_POSIX_TIMEOUTS); 326 case _SC_TIMER_MAX: 327 return (-1); 328 case _SC_TIMERS: 329 return (_POSIX_TIMERS); 330 case _SC_TRACE: 331 case _SC_TRACE_EVENT_FILTER: 332 case _SC_TRACE_EVENT_NAME_MAX: 333 case _SC_TRACE_INHERIT: 334 case _SC_TRACE_LOG: 335 return (_POSIX_TRACE); 336 case _SC_TTY_NAME_MAX: 337 return (TTY_NAME_MAX); 338 case _SC_TYPED_MEMORY_OBJECTS: 339 return (_POSIX_TYPED_MEMORY_OBJECTS); 340 case _SC_V6_ILP32_OFF32: 341 return (_POSIX_V6_ILP32_OFF32); 342 case _SC_V6_ILP32_OFFBIG: 343 #if _POSIX_V6_ILP32_OFFBIG == 0 344 if (sizeof(int) * CHAR_BIT == 32 && 345 sizeof(long) * CHAR_BIT == 32 && 346 sizeof(void *) * CHAR_BIT == 32 && 347 sizeof(off_t) * CHAR_BIT >= 64) 348 return 1; 349 else 350 return -1; 351 #else 352 return (_POSIX_V6_ILP32_OFFBIG); 353 #endif 354 case _SC_V6_LP64_OFF64: 355 #if _POSIX_V6_LP64_OFF64 == 0 356 if (sizeof(int) * CHAR_BIT == 32 && 357 sizeof(long) * CHAR_BIT == 64 && 358 sizeof(void *) * CHAR_BIT == 64 && 359 sizeof(off_t) * CHAR_BIT == 64) 360 return 1; 361 else 362 return -1; 363 #else 364 return (_POSIX_V6_LP64_OFF64); 365 #endif 366 case _SC_V6_LPBIG_OFFBIG: 367 #if _POSIX_V6_LPBIG_OFFBIG == 0 368 if (sizeof(int) * CHAR_BIT >= 32 && 369 sizeof(long) * CHAR_BIT >= 64 && 370 sizeof(void *) * CHAR_BIT >= 64 && 371 sizeof(off_t) * CHAR_BIT >= 64) 372 return 1; 373 else 374 return -1; 375 #else 376 return (_POSIX_V6_LPBIG_OFFBIG); 377 #endif 378 case _SC_V7_ILP32_OFF32: 379 return (_POSIX_V7_ILP32_OFF32); 380 case _SC_V7_ILP32_OFFBIG: 381 #if _POSIX_V7_ILP32_OFFBIG == 0 382 if (sizeof(int) * CHAR_BIT == 32 && 383 sizeof(long) * CHAR_BIT == 32 && 384 sizeof(void *) * CHAR_BIT == 32 && 385 sizeof(off_t) * CHAR_BIT >= 64) 386 return 1; 387 else 388 return -1; 389 #else 390 return (_POSIX_V7_ILP32_OFFBIG); 391 #endif 392 case _SC_V7_LP64_OFF64: 393 #if _POSIX_V7_LP64_OFF64 == 0 394 if (sizeof(int) * CHAR_BIT == 32 && 395 sizeof(long) * CHAR_BIT == 64 && 396 sizeof(void *) * CHAR_BIT == 64 && 397 sizeof(off_t) * CHAR_BIT == 64) 398 return 1; 399 else 400 return -1; 401 #else 402 return (_POSIX_V7_LP64_OFF64); 403 #endif 404 case _SC_V7_LPBIG_OFFBIG: 405 #if _POSIX_V7_LPBIG_OFFBIG == 0 406 if (sizeof(int) * CHAR_BIT >= 32 && 407 sizeof(long) * CHAR_BIT >= 64 && 408 sizeof(void *) * CHAR_BIT >= 64 && 409 sizeof(off_t) * CHAR_BIT >= 64) 410 return 1; 411 else 412 return -1; 413 #else 414 return (_POSIX_V7_LPBIG_OFFBIG); 415 #endif 416 case _SC_XOPEN_CRYPT: 417 return (_XOPEN_CRYPT); 418 case _SC_XOPEN_ENH_I18N: 419 return (_XOPEN_ENH_I18N); 420 case _SC_XOPEN_LEGACY: 421 return (_XOPEN_LEGACY); 422 case _SC_XOPEN_REALTIME: 423 return (_XOPEN_REALTIME); 424 case _SC_XOPEN_REALTIME_THREADS: 425 return (_XOPEN_REALTIME_THREADS); 426 case _SC_XOPEN_STREAMS: 427 return (_XOPEN_STREAMS); 428 case _SC_XOPEN_UNIX: 429 return (_XOPEN_UNIX); 430 case _SC_XOPEN_UUCP: 431 return (_XOPEN_UUCP); 432 #ifdef _XOPEN_VERSION 433 case _SC_XOPEN_VERSION: 434 return (_XOPEN_VERSION); 435 #endif 436 437 /* Extensions */ 438 case _SC_PHYS_PAGES: 439 { 440 int64_t physmem; 441 442 mib[0] = CTL_HW; 443 mib[1] = HW_PHYSMEM64; 444 len = sizeof(physmem); 445 if (sysctl(mib, namelen, &physmem, &len, NULL, 0) == -1) 446 return (-1); 447 return (physmem / getpagesize()); 448 } 449 case _SC_AVPHYS_PAGES: 450 { 451 struct vmtotal vmtotal; 452 453 mib[0] = CTL_VM; 454 mib[1] = VM_METER; 455 len = sizeof(vmtotal); 456 if (sysctl(mib, namelen, &vmtotal, &len, NULL, 0) == -1) 457 return (-1); 458 return (vmtotal.t_free); 459 } 460 461 case _SC_NPROCESSORS_CONF: 462 mib[0] = CTL_HW; 463 mib[1] = HW_NCPU; 464 break; 465 case _SC_NPROCESSORS_ONLN: 466 mib[0] = CTL_HW; 467 mib[1] = HW_NCPU; 468 break; 469 470 default: 471 errno = EINVAL; 472 return (-1); 473 } 474 return (sysctl(mib, namelen, &value, &len, NULL, 0) == -1 ? -1 : value); 475 } 476