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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <grp.h>
  22 #include <pwd.h>
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <time.h>
  26 #include <limits.h>
  27 #include <sys/param.h>
  28 #include <sys/sysinfo.h>
  29
  30
  31 /* Get the value of the system variable NAME.  */
  32 long int
  33 __sysconf (name)
  34      int name;
  35 {
  36   switch (name)
  37     {
  38     default:
  39       __set_errno (EINVAL);
  40       return -1;
  41
  42     case _SC_TZNAME_MAX:
  43       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  44
  45     case _SC_CHARCLASS_NAME_MAX:
  46 #ifdef  CHARCLASS_NAME_MAX
  47       return CHARCLASS_NAME_MAX;
  48 #else
  49       return -1;
  50 #endif
  51
  52     case _SC_COLL_WEIGHTS_MAX:
  53 #ifdef  COLL_WEIGHTS_MAX
  54       return COLL_WEIGHTS_MAX;
  55 #else
  56       return -1;
  57 #endif
  58
  59     case _SC_EQUIV_CLASS_MAX:
  60 #ifdef  EQUIV_CLASS_MAX
  61       return EQUIV_CLASS_MAX;
  62 #else
  63       return -1;
  64 #endif
  65
  66     case _SC_2_LOCALEDEF:
  67 #ifdef  _POSIX2_LOCALEDEF
  68       return _POSIX2_LOCALEDEF;
  69 #else
  70       return -1;
  71 #endif
  72
  73     case _SC_NPROCESSORS_CONF:
  74       return __get_nprocs_conf ();
  75
  76     case _SC_NPROCESSORS_ONLN:
  77       return __get_nprocs ();
  78
  79     case _SC_PHYS_PAGES:
  80       return __get_phys_pages ();
  81
  82     case _SC_AVPHYS_PAGES:
  83       return __get_avphys_pages ();
  84
  85     case _SC_ATEXIT_MAX:
  86       /* We have no limit since we use lists.  */
  87       return INT_MAX;
  88
  89     case _SC_PASS_MAX:
  90       /* We have no limit but since the return value might be used to
  91          allocate a buffer we restrict the value.  */
  92       return BUFSIZ;
  93
  94     case _SC_CHAR_BIT:
  95       return CHAR_BIT;
  96
  97     case _SC_CHAR_MAX:
  98       return CHAR_MAX;
  99
 100     case _SC_CHAR_MIN:
 101       return CHAR_MIN;
 102
 103     case _SC_INT_MAX:
 104       return INT_MAX;
 105
 106     case _SC_INT_MIN:
 107       return INT_MIN;
 108
 109     case _SC_LONG_BIT:
 110       return sizeof (long int) * CHAR_BIT;
 111
 112     case _SC_WORD_BIT:
 113       return sizeof (int) * CHAR_BIT;
 114
 115     case _SC_MB_LEN_MAX:
 116       return MB_LEN_MAX;
 117
 118     case _SC_NZERO:
 119       return NZERO;
 120
 121     case _SC_SSIZE_MAX:
 122       return _POSIX_SSIZE_MAX;
 123
 124     case _SC_SCHAR_MAX:
 125       return SCHAR_MAX;
 126
 127     case _SC_SCHAR_MIN:
 128       return SCHAR_MIN;
 129
 130     case _SC_SHRT_MAX:
 131       return SHRT_MAX;
 132
 133     case _SC_SHRT_MIN:
 134       return SHRT_MIN;
 135
 136     case _SC_UCHAR_MAX:
 137       return UCHAR_MAX;
 138
 139     case _SC_UINT_MAX:
 140       return UINT_MAX;
 141
 142     case _SC_ULONG_MAX:
 143       return ULONG_MAX;
 144
 145     case _SC_USHRT_MAX:
 146       return USHRT_MAX;
 147
 148     case _SC_GETGR_R_SIZE_MAX:
 149       return NSS_BUFLEN_GROUP;
 150
 151     case _SC_GETPW_R_SIZE_MAX:
 152       return NSS_BUFLEN_PASSWD;
 153
 154     case _SC_ARG_MAX:
 155     case _SC_CHILD_MAX:
 156     case _SC_CLK_TCK:
 157     case _SC_NGROUPS_MAX:
 158     case _SC_OPEN_MAX:
 159     case _SC_STREAM_MAX:
 160     case _SC_JOB_CONTROL:
 161     case _SC_SAVED_IDS:
 162     case _SC_REALTIME_SIGNALS:
 163     case _SC_PRIORITY_SCHEDULING:
 164     case _SC_TIMERS:
 165     case _SC_ASYNCHRONOUS_IO:
 166     case _SC_PRIORITIZED_IO:
 167     case _SC_SYNCHRONIZED_IO:
 168     case _SC_FSYNC:
 169     case _SC_MAPPED_FILES:
 170     case _SC_MEMLOCK:
 171     case _SC_MEMLOCK_RANGE:
 172     case _SC_MEMORY_PROTECTION:
 173     case _SC_MESSAGE_PASSING:
 174     case _SC_SEMAPHORES:
 175     case _SC_SHARED_MEMORY_OBJECTS:
 176
 177     case _SC_AIO_LISTIO_MAX:
 178     case _SC_AIO_MAX:
 179     case _SC_AIO_PRIO_DELTA_MAX:
 180     case _SC_DELAYTIMER_MAX:
 181     case _SC_MQ_OPEN_MAX:
 182     case _SC_MQ_PRIO_MAX:
 183     case _SC_VERSION:
 184     case _SC_PAGESIZE:
 185     case _SC_RTSIG_MAX:
 186     case _SC_SEM_NSEMS_MAX:
 187     case _SC_SEM_VALUE_MAX:
 188     case _SC_SIGQUEUE_MAX:
 189     case _SC_TIMER_MAX:
 190
 191     case _SC_PII:
 192     case _SC_PII_XTI:
 193     case _SC_PII_SOCKET:
 194     case _SC_PII_OSI:
 195     case _SC_POLL:
 196     case _SC_SELECT:
 197     case _SC_UIO_MAXIOV:
 198     case _SC_PII_INTERNET_STREAM:
 199     case _SC_PII_INTERNET_DGRAM:
 200     case _SC_PII_OSI_COTS:
 201     case _SC_PII_OSI_CLTS:
 202     case _SC_PII_OSI_M:
 203     case _SC_T_IOV_MAX:
 204
 205     case _SC_BC_BASE_MAX:
 206     case _SC_BC_DIM_MAX:
 207     case _SC_BC_SCALE_MAX:
 208     case _SC_BC_STRING_MAX:
 209     case _SC_EXPR_NEST_MAX:
 210     case _SC_LINE_MAX:
 211     case _SC_RE_DUP_MAX:
 212     case _SC_2_VERSION:
 213     case _SC_2_C_BIND:
 214     case _SC_2_C_DEV:
 215     case _SC_2_FORT_DEV:
 216     case _SC_2_SW_DEV:
 217     case _SC_2_CHAR_TERM:
 218     case _SC_2_C_VERSION:
 219     case _SC_2_UPE:
 220
 221     case _SC_THREADS:
 222     case _SC_THREAD_SAFE_FUNCTIONS:
 223     case _SC_LOGIN_NAME_MAX:
 224     case _SC_TTY_NAME_MAX:
 225     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 226     case _SC_THREAD_KEYS_MAX:
 227     case _SC_THREAD_STACK_MIN:
 228     case _SC_THREAD_THREADS_MAX:
 229     case _SC_THREAD_ATTR_STACKADDR:
 230     case _SC_THREAD_ATTR_STACKSIZE:
 231     case _SC_THREAD_PRIORITY_SCHEDULING:
 232     case _SC_THREAD_PRIO_INHERIT:
 233     case _SC_THREAD_PRIO_PROTECT:
 234     case _SC_THREAD_PROCESS_SHARED:
 235
 236     case _SC_XOPEN_VERSION:
 237     case _SC_XOPEN_XCU_VERSION:
 238     case _SC_XOPEN_UNIX:
 239     case _SC_XOPEN_CRYPT:
 240     case _SC_XOPEN_ENH_I18N:
 241     case _SC_XOPEN_SHM:
 242     case _SC_XOPEN_XPG2:
 243     case _SC_XOPEN_XPG3:
 244     case _SC_XOPEN_XPG4:
 245
 246     case _SC_NL_ARGMAX:
 247     case _SC_NL_LANGMAX:
 248     case _SC_NL_MSGMAX:
 249     case _SC_NL_NMAX:
 250     case _SC_NL_SETMAX:
 251     case _SC_NL_TEXTMAX:
 252
 253     case _SC_XBS5_ILP32_OFF32:
 254     case _SC_XBS5_ILP32_OFFBIG:
 255     case _SC_XBS5_LP64_OFF64:
 256     case _SC_XBS5_LPBIG_OFFBIG:
 257
 258     case _SC_POSIX_V6_ILP32_OFF32:
 259     case _SC_POSIX_V6_ILP32_OFFBIG:
 260     case _SC_POSIX_V6_LP64_OFF64:
 261     case _SC_POSIX_V6_LPBIG_OFFBIG:
 262
 263     case _SC_POSIX_V7_ILP32_OFF32:
 264     case _SC_POSIX_V7_ILP32_OFFBIG:
 265     case _SC_POSIX_V7_LP64_OFF64:
 266     case _SC_POSIX_V7_LPBIG_OFFBIG:
 267
 268     case _SC_XOPEN_LEGACY:
 269     case _SC_XOPEN_REALTIME:
 270     case _SC_XOPEN_REALTIME_THREADS:
 271
 272       break;
 273     }
 274
 275   __set_errno (ENOSYS);
 276   return -1;
 277 }
 278
 279 weak_alias (__sysconf, sysconf)
 280 libc_hidden_def (__sysconf)
 281
 282 stub_warning (sysconf)
 283 #include <stub-tag.h>