posix/sysconf.c

   1 /* Copyright (C) 1991-2015 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 (name)
  32      int name;
  33 {
  34   switch (name)
  35     {
  36     default:
  37       __set_errno (EINVAL);
  38       return -1;
  39
  40     case _SC_TZNAME_MAX:
  41       return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
  42
  43     case _SC_CHARCLASS_NAME_MAX:
  44 #ifdef  CHARCLASS_NAME_MAX
  45       return CHARCLASS_NAME_MAX;
  46 #else
  47       return -1;
  48 #endif
  49
  50     case _SC_COLL_WEIGHTS_MAX:
  51 #ifdef  COLL_WEIGHTS_MAX
  52       return COLL_WEIGHTS_MAX;
  53 #else
  54       return -1;
  55 #endif
  56
  57     case _SC_EQUIV_CLASS_MAX:
  58 #ifdef  EQUIV_CLASS_MAX
  59       return EQUIV_CLASS_MAX;
  60 #else
  61       return -1;
  62 #endif
  63
  64     case _SC_2_LOCALEDEF:
  65 #ifdef  _POSIX2_LOCALEDEF
  66       return _POSIX2_LOCALEDEF;
  67 #else
  68       return -1;
  69 #endif
  70
  71     case _SC_NPROCESSORS_CONF:
  72       return __get_nprocs_conf ();
  73
  74     case _SC_NPROCESSORS_ONLN:
  75       return __get_nprocs ();
  76
  77     case _SC_PHYS_PAGES:
  78       return __get_phys_pages ();
  79
  80     case _SC_AVPHYS_PAGES:
  81       return __get_avphys_pages ();
  82
  83     case _SC_ATEXIT_MAX:
  84       /* We have no limit since we use lists.  */
  85       return INT_MAX;
  86
  87     case _SC_PASS_MAX:
  88       /* We have no limit but since the return value might be used to
  89          allocate a buffer we restrict the value.  */
  90       return BUFSIZ;
  91
  92     case _SC_CHAR_BIT:
  93       return CHAR_BIT;
  94
  95     case _SC_CHAR_MAX:
  96       return CHAR_MAX;
  97
  98     case _SC_CHAR_MIN:
  99       return CHAR_MIN;
 100
 101     case _SC_INT_MAX:
 102       return INT_MAX;
 103
 104     case _SC_INT_MIN:
 105       return INT_MIN;
 106
 107     case _SC_LONG_BIT:
 108       return sizeof (long int) * CHAR_BIT;
 109
 110     case _SC_WORD_BIT:
 111       return sizeof (int) * CHAR_BIT;
 112
 113     case _SC_MB_LEN_MAX:
 114       return MB_LEN_MAX;
 115
 116     case _SC_NZERO:
 117       return NZERO;
 118
 119     case _SC_SSIZE_MAX:
 120       return _POSIX_SSIZE_MAX;
 121
 122     case _SC_SCHAR_MAX:
 123       return SCHAR_MAX;
 124
 125     case _SC_SCHAR_MIN:
 126       return SCHAR_MIN;
 127
 128     case _SC_SHRT_MAX:
 129       return SHRT_MAX;
 130
 131     case _SC_SHRT_MIN:
 132       return SHRT_MIN;
 133
 134     case _SC_UCHAR_MAX:
 135       return UCHAR_MAX;
 136
 137     case _SC_UINT_MAX:
 138       return UINT_MAX;
 139
 140     case _SC_ULONG_MAX:
 141       return ULONG_MAX;
 142
 143     case _SC_USHRT_MAX:
 144       return USHRT_MAX;
 145
 146     case _SC_GETGR_R_SIZE_MAX:
 147       return NSS_BUFLEN_GROUP;
 148
 149     case _SC_GETPW_R_SIZE_MAX:
 150       return NSS_BUFLEN_PASSWD;
 151
 152     case _SC_ARG_MAX:
 153     case _SC_CHILD_MAX:
 154     case _SC_CLK_TCK:
 155     case _SC_NGROUPS_MAX:
 156     case _SC_OPEN_MAX:
 157     case _SC_STREAM_MAX:
 158     case _SC_JOB_CONTROL:
 159     case _SC_SAVED_IDS:
 160     case _SC_REALTIME_SIGNALS:
 161     case _SC_PRIORITY_SCHEDULING:
 162     case _SC_TIMERS:
 163     case _SC_ASYNCHRONOUS_IO:
 164     case _SC_PRIORITIZED_IO:
 165     case _SC_SYNCHRONIZED_IO:
 166     case _SC_FSYNC:
 167     case _SC_MAPPED_FILES:
 168     case _SC_MEMLOCK:
 169     case _SC_MEMLOCK_RANGE:
 170     case _SC_MEMORY_PROTECTION:
 171     case _SC_MESSAGE_PASSING:
 172     case _SC_SEMAPHORES:
 173     case _SC_SHARED_MEMORY_OBJECTS:
 174
 175     case _SC_AIO_LISTIO_MAX:
 176     case _SC_AIO_MAX:
 177     case _SC_AIO_PRIO_DELTA_MAX:
 178     case _SC_DELAYTIMER_MAX:
 179     case _SC_MQ_OPEN_MAX:
 180     case _SC_MQ_PRIO_MAX:
 181     case _SC_VERSION:
 182     case _SC_PAGESIZE:
 183     case _SC_RTSIG_MAX:
 184     case _SC_SEM_NSEMS_MAX:
 185     case _SC_SEM_VALUE_MAX:
 186     case _SC_SIGQUEUE_MAX:
 187     case _SC_TIMER_MAX:
 188
 189     case _SC_PII:
 190     case _SC_PII_XTI:
 191     case _SC_PII_SOCKET:
 192     case _SC_PII_OSI:
 193     case _SC_POLL:
 194     case _SC_SELECT:
 195     case _SC_UIO_MAXIOV:
 196     case _SC_PII_INTERNET_STREAM:
 197     case _SC_PII_INTERNET_DGRAM:
 198     case _SC_PII_OSI_COTS:
 199     case _SC_PII_OSI_CLTS:
 200     case _SC_PII_OSI_M:
 201     case _SC_T_IOV_MAX:
 202
 203     case _SC_BC_BASE_MAX:
 204     case _SC_BC_DIM_MAX:
 205     case _SC_BC_SCALE_MAX:
 206     case _SC_BC_STRING_MAX:
 207     case _SC_EXPR_NEST_MAX:
 208     case _SC_LINE_MAX:
 209     case _SC_RE_DUP_MAX:
 210     case _SC_2_VERSION:
 211     case _SC_2_C_BIND:
 212     case _SC_2_C_DEV:
 213     case _SC_2_FORT_DEV:
 214     case _SC_2_SW_DEV:
 215     case _SC_2_CHAR_TERM:
 216     case _SC_2_C_VERSION:
 217     case _SC_2_UPE:
 218
 219     case _SC_THREADS:
 220     case _SC_THREAD_SAFE_FUNCTIONS:
 221     case _SC_LOGIN_NAME_MAX:
 222     case _SC_TTY_NAME_MAX:
 223     case _SC_THREAD_DESTRUCTOR_ITERATIONS:
 224     case _SC_THREAD_KEYS_MAX:
 225     case _SC_THREAD_STACK_MIN:
 226     case _SC_THREAD_THREADS_MAX:
 227     case _SC_THREAD_ATTR_STACKADDR:
 228     case _SC_THREAD_ATTR_STACKSIZE:
 229     case _SC_THREAD_PRIORITY_SCHEDULING:
 230     case _SC_THREAD_PRIO_INHERIT:
 231     case _SC_THREAD_PRIO_PROTECT:
 232     case _SC_THREAD_PROCESS_SHARED:
 233
 234     case _SC_XOPEN_VERSION:
 235     case _SC_XOPEN_XCU_VERSION:
 236     case _SC_XOPEN_UNIX:
 237     case _SC_XOPEN_CRYPT:
 238     case _SC_XOPEN_ENH_I18N:
 239     case _SC_XOPEN_SHM:
 240     case _SC_XOPEN_XPG2:
 241     case _SC_XOPEN_XPG3:
 242     case _SC_XOPEN_XPG4:
 243
 244     case _SC_NL_ARGMAX:
 245     case _SC_NL_LANGMAX:
 246     case _SC_NL_MSGMAX:
 247     case _SC_NL_NMAX:
 248     case _SC_NL_SETMAX:
 249     case _SC_NL_TEXTMAX:
 250
 251     case _SC_XBS5_ILP32_OFF32:
 252     case _SC_XBS5_ILP32_OFFBIG:
 253     case _SC_XBS5_LP64_OFF64:
 254     case _SC_XBS5_LPBIG_OFFBIG:
 255
 256     case _SC_POSIX_V6_ILP32_OFF32:
 257     case _SC_POSIX_V6_ILP32_OFFBIG:
 258     case _SC_POSIX_V6_LP64_OFF64:
 259     case _SC_POSIX_V6_LPBIG_OFFBIG:
 260
 261     case _SC_POSIX_V7_ILP32_OFF32:
 262     case _SC_POSIX_V7_ILP32_OFFBIG:
 263     case _SC_POSIX_V7_LP64_OFF64:
 264     case _SC_POSIX_V7_LPBIG_OFFBIG:
 265
 266     case _SC_XOPEN_LEGACY:
 267     case _SC_XOPEN_REALTIME:
 268     case _SC_XOPEN_REALTIME_THREADS:
 269
 270       break;
 271     }
 272
 273   __set_errno (ENOSYS);
 274   return -1;
 275 }
 276
 277 weak_alias (__sysconf, sysconf)
 278 libc_hidden_def (__sysconf)
 279
 280 stub_warning (sysconf)