1 /* $OpenBSD: sysconf.c,v 1.18 2013/03/24 20:04:35 guenther 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 return (-1); 202 case _SC_SEM_VALUE_MAX: 203 return (SEM_VALUE_MAX); 204 205 /* Unsorted */ 206 case _SC_HOST_NAME_MAX: 207 return (MAXHOSTNAMELEN - 1); /* does not include \0 */ 208 case _SC_MONOTONIC_CLOCK: 209 return (_POSIX_MONOTONIC_CLOCK); 210 case _SC_2_PBS: 211 case _SC_2_PBS_ACCOUNTING: 212 case _SC_2_PBS_CHECKPOINT: 213 case _SC_2_PBS_LOCATE: 214 case _SC_2_PBS_MESSAGE: 215 case _SC_2_PBS_TRACK: 216 return (_POSIX2_PBS); 217 case _SC_ADVISORY_INFO: 218 return (_POSIX_ADVISORY_INFO); 219 case _SC_AIO_LISTIO_MAX: 220 case _SC_AIO_MAX: 221 case _SC_AIO_PRIO_DELTA_MAX: 222 return (-1); 223 case _SC_ASYNCHRONOUS_IO: 224 return (_POSIX_ASYNCHRONOUS_IO); 225 case _SC_ATEXIT_MAX: 226 return (-1); 227 case _SC_BARRIERS: 228 return (_POSIX_BARRIERS); 229 case _SC_CLOCK_SELECTION: 230 return (_POSIX_CLOCK_SELECTION); 231 case _SC_CPUTIME: 232 return (_POSIX_CPUTIME); 233 case _SC_DELAYTIMER_MAX: 234 return (-1); 235 case _SC_IOV_MAX: 236 return (IOV_MAX); 237 case _SC_IPV6: 238 #if _POSIX_IPV6 == 0 239 sverrno = errno; 240 value = socket(PF_INET6, SOCK_DGRAM, 0); 241 errno = sverrno; 242 if (value >= 0) { 243 close(value); 244 return (200112L); 245 } else 246 return (0); 247 #else 248 return (_POSIX_IPV6); 249 #endif 250 case _SC_MAPPED_FILES: 251 return (_POSIX_MAPPED_FILES); 252 case _SC_MEMLOCK: 253 return (_POSIX_MEMLOCK); 254 case _SC_MEMLOCK_RANGE: 255 return (_POSIX_MEMLOCK_RANGE); 256 case _SC_MEMORY_PROTECTION: 257 return (_POSIX_MEMORY_PROTECTION); 258 case _SC_MESSAGE_PASSING: 259 return (_POSIX_MESSAGE_PASSING); 260 case _SC_PRIORITIZED_IO: 261 return (_POSIX_PRIORITIZED_IO); 262 case _SC_PRIORITY_SCHEDULING: 263 return (_POSIX_PRIORITY_SCHEDULING); 264 case _SC_RAW_SOCKETS: 265 return (_POSIX_RAW_SOCKETS); 266 case _SC_READER_WRITER_LOCKS: 267 return (_POSIX_READER_WRITER_LOCKS); 268 case _SC_REALTIME_SIGNALS: 269 return (_POSIX_REALTIME_SIGNALS); 270 case _SC_REGEXP: 271 return (_POSIX_REGEXP); 272 case _SC_SEMAPHORES: 273 return (_POSIX_SEMAPHORES); 274 case _SC_SHARED_MEMORY_OBJECTS: 275 return (_POSIX_SHARED_MEMORY_OBJECTS); 276 case _SC_SHELL: 277 return (_POSIX_SHELL); 278 case _SC_SIGQUEUE_MAX: 279 return (-1); 280 case _SC_SPAWN: 281 return (_POSIX_SPAWN); 282 case _SC_SPIN_LOCKS: 283 return (_POSIX_SPIN_LOCKS); 284 case _SC_SPORADIC_SERVER: 285 return (_POSIX_SPORADIC_SERVER); 286 case _SC_SYNCHRONIZED_IO: 287 return (_POSIX_SYNCHRONIZED_IO); 288 case _SC_SYMLOOP_MAX: 289 return (SYMLOOP_MAX); 290 case _SC_THREAD_ATTR_STACKADDR: 291 return (_POSIX_THREAD_ATTR_STACKADDR); 292 case _SC_THREAD_ATTR_STACKSIZE: 293 return (_POSIX_THREAD_ATTR_STACKSIZE); 294 case _SC_THREAD_CPUTIME: 295 return (_POSIX_THREAD_CPUTIME); 296 case _SC_THREAD_DESTRUCTOR_ITERATIONS: 297 return (PTHREAD_DESTRUCTOR_ITERATIONS); 298 case _SC_THREAD_KEYS_MAX: 299 return (PTHREAD_KEYS_MAX); 300 case _SC_THREAD_PRIO_INHERIT: 301 return (_POSIX_THREAD_PRIO_INHERIT); 302 case _SC_THREAD_PRIO_PROTECT: 303 return (_POSIX_THREAD_PRIO_PROTECT); 304 case _SC_THREAD_PRIORITY_SCHEDULING: 305 return (_POSIX_THREAD_PRIORITY_SCHEDULING); 306 case _SC_THREAD_PROCESS_SHARED: 307 return (_POSIX_THREAD_PROCESS_SHARED); 308 case _SC_THREAD_ROBUST_PRIO_INHERIT: 309 return (_POSIX_THREAD_ROBUST_PRIO_INHERIT); 310 case _SC_THREAD_ROBUST_PRIO_PROTECT: 311 return (_POSIX_THREAD_ROBUST_PRIO_PROTECT); 312 case _SC_THREAD_SPORADIC_SERVER: 313 return (_POSIX_THREAD_SPORADIC_SERVER); 314 case _SC_THREAD_STACK_MIN: 315 return (PTHREAD_STACK_MIN); 316 case _SC_THREAD_THREADS_MAX: 317 return (PTHREAD_THREADS_MAX); 318 case _SC_THREADS: 319 return (_POSIX_THREADS); 320 case _SC_TIMEOUTS: 321 return (_POSIX_TIMEOUTS); 322 case _SC_TIMER_MAX: 323 return (-1); 324 case _SC_TIMERS: 325 return (_POSIX_TIMERS); 326 case _SC_TRACE: 327 case _SC_TRACE_EVENT_FILTER: 328 case _SC_TRACE_EVENT_NAME_MAX: 329 case _SC_TRACE_INHERIT: 330 case _SC_TRACE_LOG: 331 return (_POSIX_TRACE); 332 case _SC_TTY_NAME_MAX: 333 return (TTY_NAME_MAX); 334 case _SC_TYPED_MEMORY_OBJECTS: 335 return (_POSIX_TYPED_MEMORY_OBJECTS); 336 case _SC_V6_ILP32_OFF32: 337 return (_POSIX_V6_ILP32_OFF32); 338 case _SC_V6_ILP32_OFFBIG: 339 #if _POSIX_V6_ILP32_OFFBIG == 0 340 if (sizeof(int) * CHAR_BIT == 32 && 341 sizeof(long) * CHAR_BIT == 32 && 342 sizeof(void *) * CHAR_BIT == 32 && 343 sizeof(off_t) * CHAR_BIT >= 64) 344 return 1; 345 else 346 return -1; 347 #else 348 return (_POSIX_V6_ILP32_OFFBIG); 349 #endif 350 case _SC_V6_LP64_OFF64: 351 #if _POSIX_V6_LP64_OFF64 == 0 352 if (sizeof(int) * CHAR_BIT == 32 && 353 sizeof(long) * CHAR_BIT == 64 && 354 sizeof(void *) * CHAR_BIT == 64 && 355 sizeof(off_t) * CHAR_BIT == 64) 356 return 1; 357 else 358 return -1; 359 #else 360 return (_POSIX_V6_LP64_OFF64); 361 #endif 362 case _SC_V6_LPBIG_OFFBIG: 363 #if _POSIX_V6_LPBIG_OFFBIG == 0 364 if (sizeof(int) * CHAR_BIT >= 32 && 365 sizeof(long) * CHAR_BIT >= 64 && 366 sizeof(void *) * CHAR_BIT >= 64 && 367 sizeof(off_t) * CHAR_BIT >= 64) 368 return 1; 369 else 370 return -1; 371 #else 372 return (_POSIX_V6_LPBIG_OFFBIG); 373 #endif 374 case _SC_V7_ILP32_OFF32: 375 return (_POSIX_V7_ILP32_OFF32); 376 case _SC_V7_ILP32_OFFBIG: 377 #if _POSIX_V7_ILP32_OFFBIG == 0 378 if (sizeof(int) * CHAR_BIT == 32 && 379 sizeof(long) * CHAR_BIT == 32 && 380 sizeof(void *) * CHAR_BIT == 32 && 381 sizeof(off_t) * CHAR_BIT >= 64) 382 return 1; 383 else 384 return -1; 385 #else 386 return (_POSIX_V7_ILP32_OFFBIG); 387 #endif 388 case _SC_V7_LP64_OFF64: 389 #if _POSIX_V7_LP64_OFF64 == 0 390 if (sizeof(int) * CHAR_BIT == 32 && 391 sizeof(long) * CHAR_BIT == 64 && 392 sizeof(void *) * CHAR_BIT == 64 && 393 sizeof(off_t) * CHAR_BIT == 64) 394 return 1; 395 else 396 return -1; 397 #else 398 return (_POSIX_V7_LP64_OFF64); 399 #endif 400 case _SC_V7_LPBIG_OFFBIG: 401 #if _POSIX_V7_LPBIG_OFFBIG == 0 402 if (sizeof(int) * CHAR_BIT >= 32 && 403 sizeof(long) * CHAR_BIT >= 64 && 404 sizeof(void *) * CHAR_BIT >= 64 && 405 sizeof(off_t) * CHAR_BIT >= 64) 406 return 1; 407 else 408 return -1; 409 #else 410 return (_POSIX_V7_LPBIG_OFFBIG); 411 #endif 412 case _SC_XOPEN_CRYPT: 413 return (_XOPEN_CRYPT); 414 case _SC_XOPEN_ENH_I18N: 415 return (_XOPEN_ENH_I18N); 416 case _SC_XOPEN_LEGACY: 417 return (_XOPEN_LEGACY); 418 case _SC_XOPEN_REALTIME: 419 return (_XOPEN_REALTIME); 420 case _SC_XOPEN_REALTIME_THREADS: 421 return (_XOPEN_REALTIME_THREADS); 422 case _SC_XOPEN_STREAMS: 423 return (_XOPEN_STREAMS); 424 case _SC_XOPEN_UNIX: 425 return (_XOPEN_UNIX); 426 case _SC_XOPEN_UUCP: 427 return (_XOPEN_UUCP); 428 #ifdef _XOPEN_VERSION 429 case _SC_XOPEN_VERSION: 430 return (_XOPEN_VERSION); 431 #endif 432 433 /* Extensions */ 434 case _SC_PHYS_PAGES: 435 { 436 int64_t physmem; 437 438 mib[0] = CTL_HW; 439 mib[1] = HW_PHYSMEM64; 440 len = sizeof(physmem); 441 if (sysctl(mib, namelen, &physmem, &len, NULL, 0) == -1) 442 return (-1); 443 return (physmem / getpagesize()); 444 } 445 case _SC_AVPHYS_PAGES: 446 { 447 struct vmtotal vmtotal; 448 449 mib[0] = CTL_VM; 450 mib[1] = VM_METER; 451 len = sizeof(vmtotal); 452 if (sysctl(mib, namelen, &vmtotal, &len, NULL, 0) == -1) 453 return (-1); 454 return (vmtotal.t_free); 455 } 456 457 case _SC_NPROCESSORS_CONF: 458 mib[0] = CTL_HW; 459 mib[1] = HW_NCPU; 460 break; 461 case _SC_NPROCESSORS_ONLN: 462 mib[0] = CTL_HW; 463 mib[1] = HW_NCPU; 464 break; 465 466 default: 467 errno = EINVAL; 468 return (-1); 469 } 470 return (sysctl(mib, namelen, &value, &len, NULL, 0) == -1 ? -1 : value); 471 } 472