posix/sysconf.c

   1 /* Copyright (C) 1991,1993,1995-1997,2001,2002,2003,2009
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <grp.h>
  21 #include <pwd.h>
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <time.h>
  25 #include <limits.h>
  26 #include <sys/param.h>
  27 #include <sys/sysinfo.h>
  28
  29
  30 /* Get the value of the system variable NAME.  */
  31 long int
  32 __sysconf (name)
  33      int name;
  34 {
  35   switch (name)
  36     {
  37     default:
  38       __set_errno (EINVAL);
  39       return -1;
  40
  41     case _SC_TZNAME_MAX:
  42       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  43
  44     case _SC_CHARCLASS_NAME_MAX:
  45 #ifdef  CHARCLASS_NAME_MAX
  46       return CHARCLASS_NAME_MAX;
  47 #else
  48       return -1;
  49 #endif
  50
  51     case _SC_COLL_WEIGHTS_MAX:
  52 #ifdef  COLL_WEIGHTS_MAX
  53       return COLL_WEIGHTS_MAX;
  54 #else
  55       return -1;
  56 #endif
  57
  58     case _SC_EQUIV_CLASS_MAX:
  59 #ifdef  EQUIV_CLASS_MAX
  60       return EQUIV_CLASS_MAX;
  61 #else
  62       return -1;
  63 #endif
  64
  65     case _SC_2_LOCALEDEF:
  66 #ifdef  _POSIX2_LOCALEDEF
  67       return _POSIX2_LOCALEDEF;
  68 #else
  69       return -1;
  70 #endif
  71
  72     case _SC_NPROCESSORS_CONF:
  73       return __get_nprocs_conf ();
  74
  75     case _SC_NPROCESSORS_ONLN:
  76       return __get_nprocs ();
  77
  78     case _SC_PHYS_PAGES:
  79       return __get_phys_pages ();
  80
  81     case _SC_AVPHYS_PAGES:
  82       return __get_avphys_pages ();
  83
  84     case _SC_ATEXIT_MAX:
  85       /* We have no limit since we use lists.  */
  86       return INT_MAX;
  87
  88     case _SC_PASS_MAX:
  89       /* We have no limit but since the return value might be used to
  90          allocate a buffer we restrict the value.  */
  91       return BUFSIZ;
  92
  93     case _SC_CHAR_BIT:
  94       return CHAR_BIT;
  95
  96     case _SC_CHAR_MAX:
  97       return CHAR_MAX;
  98
  99     case _SC_CHAR_MIN:
 100       return CHAR_MIN;
 101
 102     case _SC_INT_MAX:
 103       return INT_MAX;
 104
 105     case _SC_INT_MIN:
 106       return INT_MIN;
 107
 108     case _SC_LONG_BIT:
 109       return sizeof (long int) * CHAR_BIT;
 110
 111     case _SC_WORD_BIT:
 112       return sizeof (int) * CHAR_BIT;
 113
 114     case _SC_MB_LEN_MAX:
 115       return MB_LEN_MAX;
 116
 117     case _SC_NZERO:
 118       return NZERO;
 119
 120     case _SC_SSIZE_MAX:
 121       return _POSIX_SSIZE_MAX;
 122
 123     case _SC_SCHAR_MAX:
 124       return SCHAR_MAX;
 125
 126     case _SC_SCHAR_MIN:
 127       return SCHAR_MIN;
 128
 129     case _SC_SHRT_MAX:
 130       return SHRT_MAX;
 131
 132     case _SC_SHRT_MIN:
 133       return SHRT_MIN;
 134
 135     case _SC_UCHAR_MAX:
 136       return UCHAR_MAX;
 137
 138     case _SC_UINT_MAX:
 139       return UINT_MAX;
 140
 141     case _SC_ULONG_MAX:
 142       return ULONG_MAX;
 143
 144     case _SC_USHRT_MAX:
 145       return USHRT_MAX;
 146
 147     case _SC_GETGR_R_SIZE_MAX:
 148       return NSS_BUFLEN_GROUP;
 149
 150     case _SC_GETPW_R_SIZE_MAX:
 151       return NSS_BUFLEN_PASSWD;
 152
 153     case _SC_ARG_MAX:
 154     case _SC_CHILD_MAX:
 155     case _SC_CLK_TCK:
 156     case _SC_NGROUPS_MAX:
 157     case _SC_OPEN_MAX:
 158     case _SC_STREAM_MAX:
 159     case _SC_JOB_CONTROL:
 160     case _SC_SAVED_IDS:
 161     case _SC_REALTIME_SIGNALS:
 162     case _SC_PRIORITY_SCHEDULING:
 163     case _SC_TIMERS:
 164     case _SC_ASYNCHRONOUS_IO:
 165     case _SC_PRIORITIZED_IO:
 166     case _SC_SYNCHRONIZED_IO:
 167     case _SC_FSYNC:
 168     case _SC_MAPPED_FILES:
 169     case _SC_MEMLOCK:
 170     case _SC_MEMLOCK_RANGE:
 171     case _SC_MEMORY_PROTECTION:
 172     case _SC_MESSAGE_PASSING:
 173     case _SC_SEMAPHORES:
 174     case _SC_SHARED_MEMORY_OBJECTS:
 175
 176     case _SC_AIO_LISTIO_MAX:
 177     case _SC_AIO_MAX:
 178     case _SC_AIO_PRIO_DELTA_MAX:
 179     case _SC_DELAYTIMER_MAX:
 180     case _SC_MQ_OPEN_MAX:
 181     case _SC_MQ_PRIO_MAX:
 182     case _SC_VERSION:
 183     case _SC_PAGESIZE:
 184     case _SC_RTSIG_MAX:
 185     case _SC_SEM_NSEMS_MAX:
 186     case _SC_SEM_VALUE_MAX:
 187     case _SC_SIGQUEUE_MAX:
 188     case _SC_TIMER_MAX:
 189
 190     case _SC_PII:
 191     case _SC_PII_XTI:
 192     case _SC_PII_SOCKET:
 193     case _SC_PII_OSI:
 194     case _SC_POLL:
 195     case _SC_SELECT:
 196     case _SC_UIO_MAXIOV:
 197     case _SC_PII_INTERNET_STREAM:
 198     case _SC_PII_INTERNET_DGRAM:
 199     case _SC_PII_OSI_COTS:
 200     case _SC_PII_OSI_CLTS:
 201     case _SC_PII_OSI_M:
 202     case _SC_T_IOV_MAX:
 203
 204     case _SC_BC_BASE_MAX:
 205     case _SC_BC_DIM_MAX:
 206     case _SC_BC_SCALE_MAX:
 207     case _SC_BC_STRING_MAX:
 208     case _SC_EXPR_NEST_MAX:
 209     case _SC_LINE_MAX:
 210     case _SC_RE_DUP_MAX:
 211     case _SC_2_VERSION:
 212     case _SC_2_C_BIND:
 213     case _SC_2_C_DEV:
 214     case _SC_2_FORT_DEV:
 215     case _SC_2_SW_DEV:
 216     case _SC_2_CHAR_TERM:
 217     case _SC_2_C_VERSION:
 218     case _SC_2_UPE:
 219
 220     case _SC_THREADS:
 221     case _SC_THREAD_SAFE_FUNCTIONS:
 222     case _SC_LOGIN_NAME_MAX:
 223     case _SC_TTY_NAME_MAX:
 224     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 225     case _SC_THREAD_KEYS_MAX:
 226     case _SC_THREAD_STACK_MIN:
 227     case _SC_THREAD_THREADS_MAX:
 228     case _SC_THREAD_ATTR_STACKADDR:
 229     case _SC_THREAD_ATTR_STACKSIZE:
 230     case _SC_THREAD_PRIORITY_SCHEDULING:
 231     case _SC_THREAD_PRIO_INHERIT:
 232     case _SC_THREAD_PRIO_PROTECT:
 233     case _SC_THREAD_PROCESS_SHARED:
 234
 235     case _SC_XOPEN_VERSION:
 236     case _SC_XOPEN_XCU_VERSION:
 237     case _SC_XOPEN_UNIX:
 238     case _SC_XOPEN_CRYPT:
 239     case _SC_XOPEN_ENH_I18N:
 240     case _SC_XOPEN_SHM:
 241     case _SC_XOPEN_XPG2:
 242     case _SC_XOPEN_XPG3:
 243     case _SC_XOPEN_XPG4:
 244
 245     case _SC_NL_ARGMAX:
 246     case _SC_NL_LANGMAX:
 247     case _SC_NL_MSGMAX:
 248     case _SC_NL_NMAX:
 249     case _SC_NL_SETMAX:
 250     case _SC_NL_TEXTMAX:
 251
 252     case _SC_XBS5_ILP32_OFF32:
 253     case _SC_XBS5_ILP32_OFFBIG:
 254     case _SC_XBS5_LP64_OFF64:
 255     case _SC_XBS5_LPBIG_OFFBIG:
 256
 257     case _SC_POSIX_V6_ILP32_OFF32:
 258     case _SC_POSIX_V6_ILP32_OFFBIG:
 259     case _SC_POSIX_V6_LP64_OFF64:
 260     case _SC_POSIX_V6_LPBIG_OFFBIG:
 261
 262     case _SC_POSIX_V7_ILP32_OFF32:
 263     case _SC_POSIX_V7_ILP32_OFFBIG:
 264     case _SC_POSIX_V7_LP64_OFF64:
 265     case _SC_POSIX_V7_LPBIG_OFFBIG:
 266
 267     case _SC_XOPEN_LEGACY:
 268     case _SC_XOPEN_REALTIME:
 269     case _SC_XOPEN_REALTIME_THREADS:
 270
 271       break;
 272     }
 273
 274   __set_errno (ENOSYS);
 275   return -1;
 276 }
 277
 278 weak_alias (__sysconf, sysconf)
 279 libc_hidden_def (__sysconf)
 280
 281 stub_warning (sysconf)