1 /* $OpenBSD: sysconf.c,v 1.16 2012/06/24 20:11:16 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 return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur); 79 case _SC_CLK_TCK: 80 return (CLK_TCK); 81 case _SC_JOB_CONTROL: 82 return (_POSIX_JOB_CONTROL); 83 case _SC_NGROUPS_MAX: 84 mib[0] = CTL_KERN; 85 mib[1] = KERN_NGROUPS; 86 break; 87 case _SC_OPEN_MAX: 88 return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur); 89 case _SC_STREAM_MAX: 90 return (FOPEN_MAX); 91 case _SC_TZNAME_MAX: 92 return (NAME_MAX); 93 case _SC_SAVED_IDS: 94 return (_POSIX_SAVED_IDS); 95 case _SC_VERSION: 96 mib[0] = CTL_KERN; 97 mib[1] = KERN_POSIX1; 98 break; 99 100 /* 1003.1b */ 101 case _SC_PAGESIZE: 102 mib[0] = CTL_HW; 103 mib[1] = HW_PAGESIZE; 104 break; 105 case _SC_FSYNC: 106 return (_POSIX_FSYNC); 107 108 /* 1003.1c */ 109 case _SC_LOGIN_NAME_MAX: 110 return (LOGIN_NAME_MAX); 111 112 case _SC_THREAD_SAFE_FUNCTIONS: 113 return (_POSIX_THREAD_SAFE_FUNCTIONS); 114 115 case _SC_GETGR_R_SIZE_MAX: 116 return (_GR_BUF_LEN); 117 118 case _SC_GETPW_R_SIZE_MAX: 119 return (_PW_BUF_LEN); 120 121 /* 1003.2 */ 122 case _SC_BC_BASE_MAX: 123 return (BC_BASE_MAX); 124 case _SC_BC_DIM_MAX: 125 return (BC_DIM_MAX); 126 case _SC_BC_SCALE_MAX: 127 return (BC_SCALE_MAX); 128 case _SC_BC_STRING_MAX: 129 return (BC_STRING_MAX); 130 case _SC_COLL_WEIGHTS_MAX: 131 return (COLL_WEIGHTS_MAX); 132 case _SC_EXPR_NEST_MAX: 133 return (EXPR_NEST_MAX); 134 case _SC_LINE_MAX: 135 return (LINE_MAX); 136 case _SC_RE_DUP_MAX: 137 return (RE_DUP_MAX); 138 case _SC_2_VERSION: 139 return (_POSIX2_VERSION); 140 case _SC_2_C_BIND: 141 return (_POSIX2_C_BIND); 142 case _SC_2_C_DEV: 143 return (_POSIX2_C_DEV); 144 case _SC_2_CHAR_TERM: 145 return (_POSIX2_CHAR_TERM); 146 case _SC_2_FORT_DEV: 147 return (_POSIX2_FORT_DEV); 148 case _SC_2_FORT_RUN: 149 return (_POSIX2_FORT_RUN); 150 case _SC_2_LOCALEDEF: 151 return (_POSIX2_LOCALEDEF); 152 case _SC_2_SW_DEV: 153 return (_POSIX2_SW_DEV); 154 case _SC_2_UPE: 155 return (_POSIX2_UPE); 156 157 /* XPG 4.2 */ 158 case _SC_XOPEN_SHM: 159 mib[0] = CTL_KERN; 160 mib[1] = KERN_SYSVSHM; 161 162 yesno: if (sysctl(mib, namelen, &value, &len, NULL, 0) == -1) 163 return (-1); 164 if (value == 0) 165 return (-1); 166 return (value); 167 break; 168 case _SC_SEM_NSEMS_MAX: 169 case _SC_SEM_VALUE_MAX: 170 mib[0] = CTL_KERN; 171 mib[1] = KERN_SEMINFO; 172 mib[2] = name = _SC_SEM_NSEMS_MAX ? 173 KERN_SEMINFO_SEMMNS : KERN_SEMINFO_SEMVMX; 174 namelen = 3; 175 break; 176 177 /* Unsorted */ 178 case _SC_HOST_NAME_MAX: 179 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 180 case _SC_MONOTONIC_CLOCK: 181 return (_POSIX_MONOTONIC_CLOCK); 182 case _SC_2_PBS: 183 case _SC_2_PBS_ACCOUNTING: 184 case _SC_2_PBS_CHECKPOINT: 185 case _SC_2_PBS_LOCATE: 186 case _SC_2_PBS_MESSAGE: 187 case _SC_2_PBS_TRACK: 188 return (_POSIX2_PBS); 189 case _SC_ADVISORY_INFO: 190 return (_POSIX_ADVISORY_INFO); 191 case _SC_AIO_LISTIO_MAX: 192 case _SC_AIO_MAX: 193 case _SC_AIO_PRIO_DELTA_MAX: 194 return (-1); 195 case _SC_ASYNCHRONOUS_IO: 196 return (_POSIX_ASYNCHRONOUS_IO); 197 case _SC_ATEXIT_MAX: 198 return (-1); 199 case _SC_BARRIERS: 200 return (_POSIX_BARRIERS); 201 case _SC_CLOCK_SELECTION: 202 return (_POSIX_CLOCK_SELECTION); 203 case _SC_CPUTIME: 204 return (_POSIX_CPUTIME); 205 case _SC_DELAYTIMER_MAX: 206 return (-1); 207 case _SC_IOV_MAX: 208 return (IOV_MAX); 209 case _SC_IPV6: 210 #if _POSIX_IPV6 == 0 211 sverrno = errno; 212 value = socket(PF_INET6, SOCK_DGRAM, 0); 213 errno = sverrno; 214 if (value >= 0) { 215 close(value); 216 return (200112L); 217 } else 218 return (0); 219 #else 220 return (_POSIX_IPV6); 221 #endif 222 case _SC_MAPPED_FILES: 223 return (_POSIX_MAPPED_FILES); 224 case _SC_MEMLOCK: 225 return (_POSIX_MEMLOCK); 226 case _SC_MEMLOCK_RANGE: 227 return (_POSIX_MEMLOCK_RANGE); 228 case _SC_MEMORY_PROTECTION: 229 return (_POSIX_MEMORY_PROTECTION); 230 case _SC_MESSAGE_PASSING: 231 return (_POSIX_MESSAGE_PASSING); 232 case _SC_PRIORITIZED_IO: 233 return (_POSIX_PRIORITIZED_IO); 234 case _SC_PRIORITY_SCHEDULING: 235 return (_POSIX_PRIORITY_SCHEDULING); 236 case _SC_RAW_SOCKETS: 237 return (_POSIX_RAW_SOCKETS); 238 case _SC_READER_WRITER_LOCKS: 239 return (_POSIX_READER_WRITER_LOCKS); 240 case _SC_REALTIME_SIGNALS: 241 return (_POSIX_REALTIME_SIGNALS); 242 case _SC_REGEXP: 243 return (_POSIX_REGEXP); 244 case _SC_SEMAPHORES: 245 return (_POSIX_SEMAPHORES); 246 case _SC_SHARED_MEMORY_OBJECTS: 247 return (_POSIX_SHARED_MEMORY_OBJECTS); 248 case _SC_SHELL: 249 return (_POSIX_SHELL); 250 case _SC_SIGQUEUE_MAX: 251 return (-1); 252 case _SC_SPAWN: 253 return (_POSIX_SPAWN); 254 case _SC_SPIN_LOCKS: 255 return (_POSIX_SPIN_LOCKS); 256 case _SC_SPORADIC_SERVER: 257 return (_POSIX_SPORADIC_SERVER); 258 case _SC_SYNCHRONIZED_IO: 259 return (_POSIX_SYNCHRONIZED_IO); 260 case _SC_SYMLOOP_MAX: 261 return (SYMLOOP_MAX); 262 case _SC_THREAD_ATTR_STACKADDR: 263 return (_POSIX_THREAD_ATTR_STACKADDR); 264 case _SC_THREAD_ATTR_STACKSIZE: 265 return (_POSIX_THREAD_ATTR_STACKSIZE); 266 case _SC_THREAD_CPUTIME: 267 return (_POSIX_THREAD_CPUTIME); 268 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 269 return (PTHREAD_DESTRUCTOR_ITERATIONS); 270 case _SC_THREAD_KEYS_MAX: 271 return (PTHREAD_KEYS_MAX); 272 case _SC_THREAD_PRIO_INHERIT: 273 return (_POSIX_THREAD_PRIO_INHERIT); 274 case _SC_THREAD_PRIO_PROTECT: 275 return (_POSIX_THREAD_PRIO_PROTECT); 276 case _SC_THREAD_PRIORITY_SCHEDULING: 277 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 278 case _SC_THREAD_PROCESS_SHARED: 279 return (_POSIX_THREAD_PROCESS_SHARED); 280 case _SC_THREAD_ROBUST_PRIO_INHERIT: 281 return (_POSIX_THREAD_ROBUST_PRIO_INHERIT); 282 case _SC_THREAD_ROBUST_PRIO_PROTECT: 283 return (_POSIX_THREAD_ROBUST_PRIO_PROTECT); 284 case _SC_THREAD_SPORADIC_SERVER: 285 return (_POSIX_THREAD_SPORADIC_SERVER); 286 case _SC_THREAD_STACK_MIN: 287 return (PTHREAD_STACK_MIN); 288 case _SC_THREAD_THREADS_MAX: 289 return (PTHREAD_THREADS_MAX); 290 case _SC_THREADS: 291 return (_POSIX_THREADS); 292 case _SC_TIMEOUTS: 293 return (_POSIX_TIMEOUTS); 294 case _SC_TIMER_MAX: 295 return (-1); 296 case _SC_TIMERS: 297 return (_POSIX_TIMERS); 298 case _SC_TRACE: 299 case _SC_TRACE_EVENT_FILTER: 300 case _SC_TRACE_EVENT_NAME_MAX: 301 case _SC_TRACE_INHERIT: 302 case _SC_TRACE_LOG: 303 return (_POSIX_TRACE); 304 case _SC_TTY_NAME_MAX: 305 return (TTY_NAME_MAX); 306 case _SC_TYPED_MEMORY_OBJECTS: 307 return (_POSIX_TYPED_MEMORY_OBJECTS); 308 case _SC_V6_ILP32_OFF32: 309 return (_POSIX_V6_ILP32_OFF32); 310 case _SC_V6_ILP32_OFFBIG: 311 #if _POSIX_V6_ILP32_OFFBIG == 0 312 if (sizeof(int) * CHAR_BIT == 32 && 313 sizeof(long) * CHAR_BIT == 32 && 314 sizeof(void *) * CHAR_BIT == 32 && 315 sizeof(off_t) * CHAR_BIT >= 64) 316 return 1; 317 else 318 return -1; 319 #else 320 return (_POSIX_V6_ILP32_OFFBIG); 321 #endif 322 case _SC_V6_LP64_OFF64: 323 #if _POSIX_V6_LP64_OFF64 == 0 324 if (sizeof(int) * CHAR_BIT == 32 && 325 sizeof(long) * CHAR_BIT == 64 && 326 sizeof(void *) * CHAR_BIT == 64 && 327 sizeof(off_t) * CHAR_BIT == 64) 328 return 1; 329 else 330 return -1; 331 #else 332 return (_POSIX_V6_LP64_OFF64); 333 #endif 334 case _SC_V6_LPBIG_OFFBIG: 335 #if _POSIX_V6_LPBIG_OFFBIG == 0 336 if (sizeof(int) * CHAR_BIT >= 32 && 337 sizeof(long) * CHAR_BIT >= 64 && 338 sizeof(void *) * CHAR_BIT >= 64 && 339 sizeof(off_t) * CHAR_BIT >= 64) 340 return 1; 341 else 342 return -1; 343 #else 344 return (_POSIX_V6_LPBIG_OFFBIG); 345 #endif 346 case _SC_V7_ILP32_OFF32: 347 return (_POSIX_V7_ILP32_OFF32); 348 case _SC_V7_ILP32_OFFBIG: 349 #if _POSIX_V7_ILP32_OFFBIG == 0 350 if (sizeof(int) * CHAR_BIT == 32 && 351 sizeof(long) * CHAR_BIT == 32 && 352 sizeof(void *) * CHAR_BIT == 32 && 353 sizeof(off_t) * CHAR_BIT >= 64) 354 return 1; 355 else 356 return -1; 357 #else 358 return (_POSIX_V7_ILP32_OFFBIG); 359 #endif 360 case _SC_V7_LP64_OFF64: 361 #if _POSIX_V7_LP64_OFF64 == 0 362 if (sizeof(int) * CHAR_BIT == 32 && 363 sizeof(long) * CHAR_BIT == 64 && 364 sizeof(void *) * CHAR_BIT == 64 && 365 sizeof(off_t) * CHAR_BIT == 64) 366 return 1; 367 else 368 return -1; 369 #else 370 return (_POSIX_V7_LP64_OFF64); 371 #endif 372 case _SC_V7_LPBIG_OFFBIG: 373 #if _POSIX_V7_LPBIG_OFFBIG == 0 374 if (sizeof(int) * CHAR_BIT >= 32 && 375 sizeof(long) * CHAR_BIT >= 64 && 376 sizeof(void *) * CHAR_BIT >= 64 && 377 sizeof(off_t) * CHAR_BIT >= 64) 378 return 1; 379 else 380 return -1; 381 #else 382 return (_POSIX_V7_LPBIG_OFFBIG); 383 #endif 384 case _SC_XOPEN_CRYPT: 385 return (_XOPEN_CRYPT); 386 case _SC_XOPEN_ENH_I18N: 387 return (_XOPEN_ENH_I18N); 388 case _SC_XOPEN_LEGACY: 389 return (_XOPEN_LEGACY); 390 case _SC_XOPEN_REALTIME: 391 return (_XOPEN_REALTIME); 392 case _SC_XOPEN_REALTIME_THREADS: 393 return (_XOPEN_REALTIME_THREADS); 394 case _SC_XOPEN_STREAMS: 395 return (_XOPEN_STREAMS); 396 case _SC_XOPEN_UNIX: 397 return (_XOPEN_UNIX); 398 case _SC_XOPEN_UUCP: 399 return (_XOPEN_UUCP); 400 #ifdef _XOPEN_VERSION 401 case _SC_XOPEN_VERSION: 402 return (_XOPEN_VERSION); 403 #endif 404 405 /* Extensions */ 406 case _SC_PHYS_PAGES: 407 { 408 int64_t physmem; 409 410 mib[0] = CTL_HW; 411 mib[1] = HW_PHYSMEM64; 412 len = sizeof(physmem); 413 if (sysctl(mib, namelen, &physmem, &len, NULL, 0) == -1) 414 return (-1); 415 return (physmem / getpagesize()); 416 } 417 case _SC_AVPHYS_PAGES: 418 { 419 struct vmtotal vmtotal; 420 421 mib[0] = CTL_VM; 422 mib[1] = VM_METER; 423 len = sizeof(vmtotal); 424 if (sysctl(mib, namelen, &vmtotal, &len, NULL, 0) == -1) 425 return (-1); 426 return (vmtotal.t_free); 427 } 428 429 case _SC_NPROCESSORS_CONF: 430 mib[0] = CTL_HW; 431 mib[1] = HW_NCPU; 432 break; 433 case _SC_NPROCESSORS_ONLN: 434 mib[0] = CTL_HW; 435 mib[1] = HW_NCPU; 436 break; 437 438 default: 439 errno = EINVAL; 440 return (-1); 441 } 442 return (sysctl(mib, namelen, &value, &len, NULL, 0) == -1 ? -1 : value); 443 } 444