posix/sysconf.c

   1 /* Copyright (C) 1991-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <grp.h>
  20 #include <pwd.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <time.h>
  24 #include <limits.h>
  25 #include <sys/param.h>
  26 #include <sys/sysinfo.h>
  27
  28
  29 /* Get the value of the system variable NAME.  */
  30 long int
  31 __sysconf (int name)
  32 {
  33   switch (name)
  34     {
  35     default:
  36       __set_errno (EINVAL);
  37       return -1;
  38
  39     case _SC_TZNAME_MAX:
  40       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  41
  42     case _SC_CHARCLASS_NAME_MAX:
  43 #ifdef  CHARCLASS_NAME_MAX
  44       return CHARCLASS_NAME_MAX;
  45 #else
  46       return -1;
  47 #endif
  48
  49     case _SC_COLL_WEIGHTS_MAX:
  50 #ifdef  COLL_WEIGHTS_MAX
  51       return COLL_WEIGHTS_MAX;
  52 #else
  53       return -1;
  54 #endif
  55
  56     case _SC_EQUIV_CLASS_MAX:
  57 #ifdef  EQUIV_CLASS_MAX
  58       return EQUIV_CLASS_MAX;
  59 #else
  60       return -1;
  61 #endif
  62
  63     case _SC_2_LOCALEDEF:
  64 #ifdef  _POSIX2_LOCALEDEF
  65       return _POSIX2_LOCALEDEF;
  66 #else
  67       return -1;
  68 #endif
  69
  70     case _SC_NPROCESSORS_CONF:
  71       return __get_nprocs_conf ();
  72
  73     case _SC_NPROCESSORS_ONLN:
  74       return __get_nprocs ();
  75
  76     case _SC_PHYS_PAGES:
  77       return __get_phys_pages ();
  78
  79     case _SC_AVPHYS_PAGES:
  80       return __get_avphys_pages ();
  81
  82     case _SC_ATEXIT_MAX:
  83       /* We have no limit since we use lists.  */
  84       return INT_MAX;
  85
  86     case _SC_PASS_MAX:
  87       /* We have no limit but since the return value might be used to
  88          allocate a buffer we restrict the value.  */
  89       return BUFSIZ;
  90
  91     case _SC_CHAR_BIT:
  92       return CHAR_BIT;
  93
  94     case _SC_CHAR_MAX:
  95       return CHAR_MAX;
  96
  97     case _SC_CHAR_MIN:
  98       return CHAR_MIN;
  99
 100     case _SC_INT_MAX:
 101       return INT_MAX;
 102
 103     case _SC_INT_MIN:
 104       return INT_MIN;
 105
 106     case _SC_LONG_BIT:
 107       return sizeof (long int) * CHAR_BIT;
 108
 109     case _SC_WORD_BIT:
 110       return sizeof (int) * CHAR_BIT;
 111
 112     case _SC_MB_LEN_MAX:
 113       return MB_LEN_MAX;
 114
 115     case _SC_NZERO:
 116       return NZERO;
 117
 118     case _SC_SSIZE_MAX:
 119       return _POSIX_SSIZE_MAX;
 120
 121     case _SC_SCHAR_MAX:
 122       return SCHAR_MAX;
 123
 124     case _SC_SCHAR_MIN:
 125       return SCHAR_MIN;
 126
 127     case _SC_SHRT_MAX:
 128       return SHRT_MAX;
 129
 130     case _SC_SHRT_MIN:
 131       return SHRT_MIN;
 132
 133     case _SC_UCHAR_MAX:
 134       return UCHAR_MAX;
 135
 136     case _SC_UINT_MAX:
 137       return UINT_MAX;
 138
 139     case _SC_ULONG_MAX:
 140       return ULONG_MAX;
 141
 142     case _SC_USHRT_MAX:
 143       return USHRT_MAX;
 144
 145     case _SC_GETGR_R_SIZE_MAX:
 146       return NSS_BUFLEN_GROUP;
 147
 148     case _SC_GETPW_R_SIZE_MAX:
 149       return NSS_BUFLEN_PASSWD;
 150
 151     case _SC_ARG_MAX:
 152     case _SC_CHILD_MAX:
 153     case _SC_CLK_TCK:
 154     case _SC_NGROUPS_MAX:
 155     case _SC_OPEN_MAX:
 156     case _SC_STREAM_MAX:
 157     case _SC_JOB_CONTROL:
 158     case _SC_SAVED_IDS:
 159     case _SC_REALTIME_SIGNALS:
 160     case _SC_PRIORITY_SCHEDULING:
 161     case _SC_TIMERS:
 162     case _SC_ASYNCHRONOUS_IO:
 163     case _SC_PRIORITIZED_IO:
 164     case _SC_SYNCHRONIZED_IO:
 165     case _SC_FSYNC:
 166     case _SC_MAPPED_FILES:
 167     case _SC_MEMLOCK:
 168     case _SC_MEMLOCK_RANGE:
 169     case _SC_MEMORY_PROTECTION:
 170     case _SC_MESSAGE_PASSING:
 171     case _SC_SEMAPHORES:
 172     case _SC_SHARED_MEMORY_OBJECTS:
 173
 174     case _SC_AIO_LISTIO_MAX:
 175     case _SC_AIO_MAX:
 176     case _SC_AIO_PRIO_DELTA_MAX:
 177     case _SC_DELAYTIMER_MAX:
 178     case _SC_MQ_OPEN_MAX:
 179     case _SC_MQ_PRIO_MAX:
 180     case _SC_VERSION:
 181     case _SC_PAGESIZE:
 182     case _SC_RTSIG_MAX:
 183     case _SC_SEM_NSEMS_MAX:
 184     case _SC_SEM_VALUE_MAX:
 185     case _SC_SIGQUEUE_MAX:
 186     case _SC_TIMER_MAX:
 187
 188     case _SC_PII:
 189     case _SC_PII_XTI:
 190     case _SC_PII_SOCKET:
 191     case _SC_PII_OSI:
 192     case _SC_POLL:
 193     case _SC_SELECT:
 194     case _SC_UIO_MAXIOV:
 195     case _SC_PII_INTERNET_STREAM:
 196     case _SC_PII_INTERNET_DGRAM:
 197     case _SC_PII_OSI_COTS:
 198     case _SC_PII_OSI_CLTS:
 199     case _SC_PII_OSI_M:
 200     case _SC_T_IOV_MAX:
 201
 202     case _SC_BC_BASE_MAX:
 203     case _SC_BC_DIM_MAX:
 204     case _SC_BC_SCALE_MAX:
 205     case _SC_BC_STRING_MAX:
 206     case _SC_EXPR_NEST_MAX:
 207     case _SC_LINE_MAX:
 208     case _SC_RE_DUP_MAX:
 209     case _SC_2_VERSION:
 210     case _SC_2_C_BIND:
 211     case _SC_2_C_DEV:
 212     case _SC_2_FORT_DEV:
 213     case _SC_2_SW_DEV:
 214     case _SC_2_CHAR_TERM:
 215     case _SC_2_C_VERSION:
 216     case _SC_2_UPE:
 217
 218     case _SC_THREADS:
 219     case _SC_THREAD_SAFE_FUNCTIONS:
 220     case _SC_LOGIN_NAME_MAX:
 221     case _SC_TTY_NAME_MAX:
 222     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 223     case _SC_THREAD_KEYS_MAX:
 224     case _SC_THREAD_STACK_MIN:
 225     case _SC_THREAD_THREADS_MAX:
 226     case _SC_THREAD_ATTR_STACKADDR:
 227     case _SC_THREAD_ATTR_STACKSIZE:
 228     case _SC_THREAD_PRIORITY_SCHEDULING:
 229     case _SC_THREAD_PRIO_INHERIT:
 230     case _SC_THREAD_PRIO_PROTECT:
 231     case _SC_THREAD_PROCESS_SHARED:
 232
 233     case _SC_XOPEN_VERSION:
 234     case _SC_XOPEN_XCU_VERSION:
 235     case _SC_XOPEN_UNIX:
 236     case _SC_XOPEN_CRYPT:
 237     case _SC_XOPEN_ENH_I18N:
 238     case _SC_XOPEN_SHM:
 239     case _SC_XOPEN_XPG2:
 240     case _SC_XOPEN_XPG3:
 241     case _SC_XOPEN_XPG4:
 242
 243     case _SC_NL_ARGMAX:
 244     case _SC_NL_LANGMAX:
 245     case _SC_NL_MSGMAX:
 246     case _SC_NL_NMAX:
 247     case _SC_NL_SETMAX:
 248     case _SC_NL_TEXTMAX:
 249
 250     case _SC_XBS5_ILP32_OFF32:
 251     case _SC_XBS5_ILP32_OFFBIG:
 252     case _SC_XBS5_LP64_OFF64:
 253     case _SC_XBS5_LPBIG_OFFBIG:
 254
 255     case _SC_POSIX_V6_ILP32_OFF32:
 256     case _SC_POSIX_V6_ILP32_OFFBIG:
 257     case _SC_POSIX_V6_LP64_OFF64:
 258     case _SC_POSIX_V6_LPBIG_OFFBIG:
 259
 260     case _SC_POSIX_V7_ILP32_OFF32:
 261     case _SC_POSIX_V7_ILP32_OFFBIG:
 262     case _SC_POSIX_V7_LP64_OFF64:
 263     case _SC_POSIX_V7_LPBIG_OFFBIG:
 264
 265     case _SC_XOPEN_LEGACY:
 266     case _SC_XOPEN_REALTIME:
 267     case _SC_XOPEN_REALTIME_THREADS:
 268
 269       break;
 270     }
 271
 272   __set_errno (ENOSYS);
 273   return -1;
 274 }
 275
 276 weak_alias (__sysconf, sysconf)
 277 libc_hidden_def (__sysconf)
 278
 279 stub_warning (sysconf)