posix/getconf.c

   1 /* Copyright (C) 1991-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published
   6    by the Free Software Foundation; version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <unistd.h>
  18 #include <errno.h>
  19 #include <error.h>
  20 #include <libintl.h>
  21 #include <locale.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25
  26 #include "../version.h"
  27 #define PACKAGE _libc_intl_domainname
  28
  29 #define NEED_SPEC_ARRAY 1
  30 #include <posix-conf-vars.h>
  31
  32 /* If all of the environments are defined in environments.h, then we don't need
  33    to bother with doing a runtime check for a specific environment.  */
  34 #if (defined _SC_V6_ILP32_OFF32 \
  35      && defined _SC_V7_LPBIG_OFFBIG \
  36      && defined _SC_XBS5_LP64_OFF64 \
  37      && defined _SC_V6_LP64_OFF64 \
  38      && defined _SC_V7_ILP32_OFFBIG \
  39      && defined _SC_V6_LPBIG_OFFBIG \
  40      && defined _SC_V7_LP64_OFF64 \
  41      && defined _SC_V7_ILP32_OFF32 \
  42      && defined _SC_XBS5_LPBIG_OFFBIG \
  43      && defined _SC_XBS5_ILP32_OFFBIG \
  44      && defined _SC_V6_ILP32_OFFBIG \
  45      && defined _SC_XBS5_ILP32_OFF32)
  46 # define ALL_ENVIRONMENTS_DEFINED 1
  47 #endif
  48
  49 struct conf
  50   {
  51     const char *name;
  52     const int call_name;
  53     const enum { SYSCONF, CONFSTR, PATHCONF } call;
  54   };
  55
  56 static const struct conf vars[] =
  57   {
  58     { "LINK_MAX", _PC_LINK_MAX, PATHCONF },
  59     { "_POSIX_LINK_MAX", _PC_LINK_MAX, PATHCONF },
  60     { "MAX_CANON", _PC_MAX_CANON, PATHCONF },
  61     { "_POSIX_MAX_CANON", _PC_MAX_CANON, PATHCONF },
  62     { "MAX_INPUT", _PC_MAX_INPUT, PATHCONF },
  63     { "_POSIX_MAX_INPUT", _PC_MAX_INPUT, PATHCONF },
  64     { "NAME_MAX", _PC_NAME_MAX, PATHCONF },
  65     { "_POSIX_NAME_MAX", _PC_NAME_MAX, PATHCONF },
  66     { "PATH_MAX", _PC_PATH_MAX, PATHCONF },
  67     { "_POSIX_PATH_MAX", _PC_PATH_MAX, PATHCONF },
  68     { "PIPE_BUF", _PC_PIPE_BUF, PATHCONF },
  69     { "_POSIX_PIPE_BUF", _PC_PIPE_BUF, PATHCONF },
  70     { "SOCK_MAXBUF", _PC_SOCK_MAXBUF, PATHCONF },
  71     { "_POSIX_ASYNC_IO", _PC_ASYNC_IO, PATHCONF },
  72     { "_POSIX_CHOWN_RESTRICTED", _PC_CHOWN_RESTRICTED, PATHCONF },
  73     { "_POSIX_NO_TRUNC", _PC_NO_TRUNC, PATHCONF },
  74     { "_POSIX_PRIO_IO", _PC_PRIO_IO, PATHCONF },
  75     { "_POSIX_SYNC_IO", _PC_SYNC_IO, PATHCONF },
  76     { "_POSIX_VDISABLE", _PC_VDISABLE, PATHCONF },
  77
  78     { "ARG_MAX", _SC_ARG_MAX, SYSCONF },
  79     { "ATEXIT_MAX", _SC_ATEXIT_MAX, SYSCONF },
  80     { "CHAR_BIT", _SC_CHAR_BIT, SYSCONF },
  81     { "CHAR_MAX", _SC_CHAR_MAX, SYSCONF },
  82     { "CHAR_MIN", _SC_CHAR_MIN, SYSCONF },
  83     { "CHILD_MAX", _SC_CHILD_MAX, SYSCONF },
  84     { "CLK_TCK", _SC_CLK_TCK, SYSCONF },
  85     { "INT_MAX", _SC_INT_MAX, SYSCONF },
  86     { "INT_MIN", _SC_INT_MIN, SYSCONF },
  87     { "IOV_MAX", _SC_UIO_MAXIOV, SYSCONF },
  88     { "LOGNAME_MAX", _SC_LOGIN_NAME_MAX, SYSCONF },
  89     { "LONG_BIT", _SC_LONG_BIT, SYSCONF },
  90     { "MB_LEN_MAX", _SC_MB_LEN_MAX, SYSCONF },
  91     { "NGROUPS_MAX", _SC_NGROUPS_MAX, SYSCONF },
  92     { "NL_ARGMAX", _SC_NL_ARGMAX, SYSCONF },
  93     { "NL_LANGMAX", _SC_NL_LANGMAX, SYSCONF },
  94     { "NL_MSGMAX", _SC_NL_MSGMAX, SYSCONF },
  95     { "NL_NMAX", _SC_NL_NMAX, SYSCONF },
  96     { "NL_SETMAX", _SC_NL_SETMAX, SYSCONF },
  97     { "NL_TEXTMAX", _SC_NL_TEXTMAX, SYSCONF },
  98     { "NSS_BUFLEN_GROUP", _SC_GETGR_R_SIZE_MAX, SYSCONF },
  99     { "NSS_BUFLEN_PASSWD", _SC_GETPW_R_SIZE_MAX, SYSCONF },
 100     { "NZERO", _SC_NZERO, SYSCONF },
 101     { "OPEN_MAX", _SC_OPEN_MAX, SYSCONF },
 102     { "PAGESIZE", _SC_PAGESIZE, SYSCONF },
 103     { "PAGE_SIZE", _SC_PAGESIZE, SYSCONF },
 104     { "PASS_MAX", _SC_PASS_MAX, SYSCONF },
 105     { "PTHREAD_DESTRUCTOR_ITERATIONS", _SC_THREAD_DESTRUCTOR_ITERATIONS, SYSCONF },
 106     { "PTHREAD_KEYS_MAX", _SC_THREAD_KEYS_MAX, SYSCONF },
 107     { "PTHREAD_STACK_MIN", _SC_THREAD_STACK_MIN, SYSCONF },
 108     { "PTHREAD_THREADS_MAX", _SC_THREAD_THREADS_MAX, SYSCONF },
 109     { "SCHAR_MAX", _SC_SCHAR_MAX, SYSCONF },
 110     { "SCHAR_MIN", _SC_SCHAR_MIN, SYSCONF },
 111     { "SHRT_MAX", _SC_SHRT_MAX, SYSCONF },
 112     { "SHRT_MIN", _SC_SHRT_MIN, SYSCONF },
 113     { "SSIZE_MAX", _SC_SSIZE_MAX, SYSCONF },
 114     { "TTY_NAME_MAX", _SC_TTY_NAME_MAX, SYSCONF },
 115     { "TZNAME_MAX", _SC_TZNAME_MAX, SYSCONF },
 116     { "UCHAR_MAX", _SC_UCHAR_MAX, SYSCONF },
 117     { "UINT_MAX", _SC_UINT_MAX, SYSCONF },
 118     { "UIO_MAXIOV", _SC_UIO_MAXIOV, SYSCONF },
 119     { "ULONG_MAX", _SC_ULONG_MAX, SYSCONF },
 120     { "USHRT_MAX", _SC_USHRT_MAX, SYSCONF },
 121     { "WORD_BIT", _SC_WORD_BIT, SYSCONF },
 122     { "_AVPHYS_PAGES", _SC_AVPHYS_PAGES, SYSCONF },
 123     { "_NPROCESSORS_CONF", _SC_NPROCESSORS_CONF, SYSCONF },
 124     { "_NPROCESSORS_ONLN", _SC_NPROCESSORS_ONLN, SYSCONF },
 125     { "_PHYS_PAGES", _SC_PHYS_PAGES, SYSCONF },
 126     { "_POSIX_ARG_MAX", _SC_ARG_MAX, SYSCONF },
 127     { "_POSIX_ASYNCHRONOUS_IO", _SC_ASYNCHRONOUS_IO, SYSCONF },
 128     { "_POSIX_CHILD_MAX", _SC_CHILD_MAX, SYSCONF },
 129     { "_POSIX_FSYNC", _SC_FSYNC, SYSCONF },
 130     { "_POSIX_JOB_CONTROL", _SC_JOB_CONTROL, SYSCONF },
 131     { "_POSIX_MAPPED_FILES", _SC_MAPPED_FILES, SYSCONF },
 132     { "_POSIX_MEMLOCK", _SC_MEMLOCK, SYSCONF },
 133     { "_POSIX_MEMLOCK_RANGE", _SC_MEMLOCK_RANGE, SYSCONF },
 134     { "_POSIX_MEMORY_PROTECTION", _SC_MEMORY_PROTECTION, SYSCONF },
 135     { "_POSIX_MESSAGE_PASSING", _SC_MESSAGE_PASSING, SYSCONF },
 136     { "_POSIX_NGROUPS_MAX", _SC_NGROUPS_MAX, SYSCONF },
 137     { "_POSIX_OPEN_MAX", _SC_OPEN_MAX, SYSCONF },
 138     { "_POSIX_PII", _SC_PII, SYSCONF },
 139     { "_POSIX_PII_INTERNET", _SC_PII_INTERNET, SYSCONF },
 140     { "_POSIX_PII_INTERNET_DGRAM", _SC_PII_INTERNET_DGRAM, SYSCONF },
 141     { "_POSIX_PII_INTERNET_STREAM", _SC_PII_INTERNET_STREAM, SYSCONF },
 142     { "_POSIX_PII_OSI", _SC_PII_OSI, SYSCONF },
 143     { "_POSIX_PII_OSI_CLTS", _SC_PII_OSI_CLTS, SYSCONF },
 144     { "_POSIX_PII_OSI_COTS", _SC_PII_OSI_COTS, SYSCONF },
 145     { "_POSIX_PII_OSI_M", _SC_PII_OSI_M, SYSCONF },
 146     { "_POSIX_PII_SOCKET", _SC_PII_SOCKET, SYSCONF },
 147     { "_POSIX_PII_XTI", _SC_PII_XTI, SYSCONF },
 148     { "_POSIX_POLL", _SC_POLL, SYSCONF },
 149     { "_POSIX_PRIORITIZED_IO", _SC_PRIORITIZED_IO, SYSCONF },
 150     { "_POSIX_PRIORITY_SCHEDULING", _SC_PRIORITY_SCHEDULING, SYSCONF },
 151     { "_POSIX_REALTIME_SIGNALS", _SC_REALTIME_SIGNALS, SYSCONF },
 152     { "_POSIX_SAVED_IDS", _SC_SAVED_IDS, SYSCONF },
 153     { "_POSIX_SELECT", _SC_SELECT, SYSCONF },
 154     { "_POSIX_SEMAPHORES", _SC_SEMAPHORES, SYSCONF },
 155     { "_POSIX_SHARED_MEMORY_OBJECTS", _SC_SHARED_MEMORY_OBJECTS, SYSCONF },
 156     { "_POSIX_SSIZE_MAX", _SC_SSIZE_MAX, SYSCONF },
 157     { "_POSIX_STREAM_MAX", _SC_STREAM_MAX, SYSCONF },
 158     { "_POSIX_SYNCHRONIZED_IO", _SC_SYNCHRONIZED_IO, SYSCONF },
 159     { "_POSIX_THREADS", _SC_THREADS, SYSCONF },
 160     { "_POSIX_THREAD_ATTR_STACKADDR", _SC_THREAD_ATTR_STACKADDR, SYSCONF },
 161     { "_POSIX_THREAD_ATTR_STACKSIZE", _SC_THREAD_ATTR_STACKSIZE, SYSCONF },
 162     { "_POSIX_THREAD_PRIORITY_SCHEDULING", _SC_THREAD_PRIORITY_SCHEDULING, SYSCONF },
 163     { "_POSIX_THREAD_PRIO_INHERIT", _SC_THREAD_PRIO_INHERIT, SYSCONF },
 164     { "_POSIX_THREAD_PRIO_PROTECT", _SC_THREAD_PRIO_PROTECT, SYSCONF },
 165     { "_POSIX_THREAD_ROBUST_PRIO_INHERIT", _SC_THREAD_ROBUST_PRIO_INHERIT,
 166       SYSCONF },
 167     { "_POSIX_THREAD_ROBUST_PRIO_PROTECT", _SC_THREAD_ROBUST_PRIO_PROTECT,
 168       SYSCONF },
 169     { "_POSIX_THREAD_PROCESS_SHARED", _SC_THREAD_PROCESS_SHARED, SYSCONF },
 170     { "_POSIX_THREAD_SAFE_FUNCTIONS", _SC_THREAD_SAFE_FUNCTIONS, SYSCONF },
 171     { "_POSIX_TIMERS", _SC_TIMERS, SYSCONF },
 172     { "TIMER_MAX", _SC_TIMER_MAX, SYSCONF },
 173     { "_POSIX_TZNAME_MAX", _SC_TZNAME_MAX, SYSCONF },
 174     { "_POSIX_VERSION", _SC_VERSION, SYSCONF },
 175     { "_T_IOV_MAX", _SC_T_IOV_MAX, SYSCONF },
 176     { "_XOPEN_CRYPT", _SC_XOPEN_CRYPT, SYSCONF },
 177     { "_XOPEN_ENH_I18N", _SC_XOPEN_ENH_I18N, SYSCONF },
 178     { "_XOPEN_LEGACY", _SC_XOPEN_LEGACY, SYSCONF },
 179     { "_XOPEN_REALTIME", _SC_XOPEN_REALTIME, SYSCONF },
 180     { "_XOPEN_REALTIME_THREADS", _SC_XOPEN_REALTIME_THREADS, SYSCONF },
 181     { "_XOPEN_SHM", _SC_XOPEN_SHM, SYSCONF },
 182     { "_XOPEN_UNIX", _SC_XOPEN_UNIX, SYSCONF },
 183     { "_XOPEN_VERSION", _SC_XOPEN_VERSION, SYSCONF },
 184     { "_XOPEN_XCU_VERSION", _SC_XOPEN_XCU_VERSION, SYSCONF },
 185     { "_XOPEN_XPG2", _SC_XOPEN_XPG2, SYSCONF },
 186     { "_XOPEN_XPG3", _SC_XOPEN_XPG3, SYSCONF },
 187     { "_XOPEN_XPG4", _SC_XOPEN_XPG4, SYSCONF },
 188     /* POSIX.2  */
 189     { "BC_BASE_MAX", _SC_BC_BASE_MAX, SYSCONF },
 190     { "BC_DIM_MAX", _SC_BC_DIM_MAX, SYSCONF },
 191     { "BC_SCALE_MAX", _SC_BC_SCALE_MAX, SYSCONF },
 192     { "BC_STRING_MAX", _SC_BC_STRING_MAX, SYSCONF },
 193     { "CHARCLASS_NAME_MAX", _SC_CHARCLASS_NAME_MAX, SYSCONF },
 194     { "COLL_WEIGHTS_MAX", _SC_COLL_WEIGHTS_MAX, SYSCONF },
 195     { "EQUIV_CLASS_MAX", _SC_EQUIV_CLASS_MAX, SYSCONF },
 196     { "EXPR_NEST_MAX", _SC_EXPR_NEST_MAX, SYSCONF },
 197     { "LINE_MAX", _SC_LINE_MAX, SYSCONF },
 198     { "POSIX2_BC_BASE_MAX", _SC_BC_BASE_MAX, SYSCONF },
 199     { "POSIX2_BC_DIM_MAX", _SC_BC_DIM_MAX, SYSCONF },
 200     { "POSIX2_BC_SCALE_MAX", _SC_BC_SCALE_MAX, SYSCONF },
 201     { "POSIX2_BC_STRING_MAX", _SC_BC_STRING_MAX, SYSCONF },
 202     { "POSIX2_CHAR_TERM", _SC_2_CHAR_TERM, SYSCONF },
 203     { "POSIX2_COLL_WEIGHTS_MAX", _SC_COLL_WEIGHTS_MAX, SYSCONF },
 204     { "POSIX2_C_BIND", _SC_2_C_BIND, SYSCONF },
 205     { "POSIX2_C_DEV", _SC_2_C_DEV, SYSCONF },
 206     { "POSIX2_C_VERSION", _SC_2_C_VERSION, SYSCONF },
 207     { "POSIX2_EXPR_NEST_MAX", _SC_EXPR_NEST_MAX, SYSCONF },
 208     { "POSIX2_FORT_DEV", _SC_2_FORT_DEV, SYSCONF },
 209     { "POSIX2_FORT_RUN", _SC_2_FORT_RUN, SYSCONF },
 210     { "_POSIX2_LINE_MAX", _SC_LINE_MAX, SYSCONF },
 211     { "POSIX2_LINE_MAX", _SC_LINE_MAX, SYSCONF },
 212     { "POSIX2_LOCALEDEF", _SC_2_LOCALEDEF, SYSCONF },
 213     { "POSIX2_RE_DUP_MAX", _SC_RE_DUP_MAX, SYSCONF },
 214     { "POSIX2_SW_DEV", _SC_2_SW_DEV, SYSCONF },
 215     { "POSIX2_UPE", _SC_2_UPE, SYSCONF },
 216     { "POSIX2_VERSION", _SC_2_VERSION, SYSCONF },
 217     { "RE_DUP_MAX", _SC_RE_DUP_MAX, SYSCONF },
 218
 219     { "PATH", _CS_PATH, CONFSTR },
 220     { "CS_PATH", _CS_PATH, CONFSTR },
 221
 222     /* LFS */
 223     { "LFS_CFLAGS", _CS_LFS_CFLAGS, CONFSTR },
 224     { "LFS_LDFLAGS", _CS_LFS_LDFLAGS, CONFSTR },
 225     { "LFS_LIBS", _CS_LFS_LIBS, CONFSTR },
 226     { "LFS_LINTFLAGS", _CS_LFS_LINTFLAGS, CONFSTR },
 227     { "LFS64_CFLAGS", _CS_LFS64_CFLAGS, CONFSTR },
 228     { "LFS64_LDFLAGS", _CS_LFS64_LDFLAGS, CONFSTR },
 229     { "LFS64_LIBS", _CS_LFS64_LIBS, CONFSTR },
 230     { "LFS64_LINTFLAGS", _CS_LFS64_LINTFLAGS, CONFSTR },
 231
 232     /* Programming environments.  */
 233     { "_XBS5_WIDTH_RESTRICTED_ENVS", _CS_V5_WIDTH_RESTRICTED_ENVS, CONFSTR },
 234     { "XBS5_WIDTH_RESTRICTED_ENVS", _CS_V5_WIDTH_RESTRICTED_ENVS, CONFSTR },
 235
 236     { "_XBS5_ILP32_OFF32", _SC_XBS5_ILP32_OFF32, SYSCONF },
 237     { "XBS5_ILP32_OFF32_CFLAGS", _CS_XBS5_ILP32_OFF32_CFLAGS, CONFSTR },
 238     { "XBS5_ILP32_OFF32_LDFLAGS", _CS_XBS5_ILP32_OFF32_LDFLAGS, CONFSTR },
 239     { "XBS5_ILP32_OFF32_LIBS", _CS_XBS5_ILP32_OFF32_LIBS, CONFSTR },
 240     { "XBS5_ILP32_OFF32_LINTFLAGS", _CS_XBS5_ILP32_OFF32_LINTFLAGS, CONFSTR },
 241
 242     { "_XBS5_ILP32_OFFBIG", _SC_XBS5_ILP32_OFFBIG, SYSCONF },
 243     { "XBS5_ILP32_OFFBIG_CFLAGS", _CS_XBS5_ILP32_OFFBIG_CFLAGS, CONFSTR },
 244     { "XBS5_ILP32_OFFBIG_LDFLAGS", _CS_XBS5_ILP32_OFFBIG_LDFLAGS, CONFSTR },
 245     { "XBS5_ILP32_OFFBIG_LIBS", _CS_XBS5_ILP32_OFFBIG_LIBS, CONFSTR },
 246     { "XBS5_ILP32_OFFBIG_LINTFLAGS", _CS_XBS5_ILP32_OFFBIG_LINTFLAGS, CONFSTR },
 247
 248     { "_XBS5_LP64_OFF64", _SC_XBS5_LP64_OFF64, SYSCONF },
 249     { "XBS5_LP64_OFF64_CFLAGS", _CS_XBS5_LP64_OFF64_CFLAGS, CONFSTR },
 250     { "XBS5_LP64_OFF64_LDFLAGS", _CS_XBS5_LP64_OFF64_LDFLAGS, CONFSTR },
 251     { "XBS5_LP64_OFF64_LIBS", _CS_XBS5_LP64_OFF64_LIBS, CONFSTR },
 252     { "XBS5_LP64_OFF64_LINTFLAGS", _CS_XBS5_LP64_OFF64_LINTFLAGS, CONFSTR },
 253
 254     { "_XBS5_LPBIG_OFFBIG", _SC_XBS5_LPBIG_OFFBIG, SYSCONF },
 255     { "XBS5_LPBIG_OFFBIG_CFLAGS", _CS_XBS5_LPBIG_OFFBIG_CFLAGS, CONFSTR },
 256     { "XBS5_LPBIG_OFFBIG_LDFLAGS", _CS_XBS5_LPBIG_OFFBIG_LDFLAGS, CONFSTR },
 257     { "XBS5_LPBIG_OFFBIG_LIBS", _CS_XBS5_LPBIG_OFFBIG_LIBS, CONFSTR },
 258     { "XBS5_LPBIG_OFFBIG_LINTFLAGS", _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS, CONFSTR },
 259
 260     { "_POSIX_V6_ILP32_OFF32", _SC_V6_ILP32_OFF32, SYSCONF },
 261     { "POSIX_V6_ILP32_OFF32_CFLAGS", _CS_POSIX_V6_ILP32_OFF32_CFLAGS, CONFSTR },
 262     { "POSIX_V6_ILP32_OFF32_LDFLAGS", _CS_POSIX_V6_ILP32_OFF32_LDFLAGS, CONFSTR },
 263     { "POSIX_V6_ILP32_OFF32_LIBS", _CS_POSIX_V6_ILP32_OFF32_LIBS, CONFSTR },
 264     { "POSIX_V6_ILP32_OFF32_LINTFLAGS", _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS, CONFSTR },
 265
 266     { "_POSIX_V6_WIDTH_RESTRICTED_ENVS", _CS_V6_WIDTH_RESTRICTED_ENVS, CONFSTR },
 267     { "POSIX_V6_WIDTH_RESTRICTED_ENVS", _CS_V6_WIDTH_RESTRICTED_ENVS, CONFSTR },
 268
 269     { "_POSIX_V6_ILP32_OFFBIG", _SC_V6_ILP32_OFFBIG, SYSCONF },
 270     { "POSIX_V6_ILP32_OFFBIG_CFLAGS", _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS, CONFSTR },
 271     { "POSIX_V6_ILP32_OFFBIG_LDFLAGS", _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS, CONFSTR },
 272     { "POSIX_V6_ILP32_OFFBIG_LIBS", _CS_POSIX_V6_ILP32_OFFBIG_LIBS, CONFSTR },
 273     { "POSIX_V6_ILP32_OFFBIG_LINTFLAGS", _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS, CONFSTR },
 274
 275     { "_POSIX_V6_LP64_OFF64", _SC_V6_LP64_OFF64, SYSCONF },
 276     { "POSIX_V6_LP64_OFF64_CFLAGS", _CS_POSIX_V6_LP64_OFF64_CFLAGS, CONFSTR },
 277     { "POSIX_V6_LP64_OFF64_LDFLAGS", _CS_POSIX_V6_LP64_OFF64_LDFLAGS, CONFSTR },
 278     { "POSIX_V6_LP64_OFF64_LIBS", _CS_POSIX_V6_LP64_OFF64_LIBS, CONFSTR },
 279     { "POSIX_V6_LP64_OFF64_LINTFLAGS", _CS_POSIX_V6_LP64_OFF64_LINTFLAGS, CONFSTR },
 280
 281     { "_POSIX_V6_LPBIG_OFFBIG", _SC_V6_LPBIG_OFFBIG, SYSCONF },
 282     { "POSIX_V6_LPBIG_OFFBIG_CFLAGS", _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS, CONFSTR },
 283     { "POSIX_V6_LPBIG_OFFBIG_LDFLAGS", _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS, CONFSTR },
 284     { "POSIX_V6_LPBIG_OFFBIG_LIBS", _CS_POSIX_V6_LPBIG_OFFBIG_LIBS, CONFSTR },
 285     { "POSIX_V6_LPBIG_OFFBIG_LINTFLAGS", _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS, CONFSTR },
 286
 287     { "_POSIX_V7_ILP32_OFF32", _SC_V7_ILP32_OFF32, SYSCONF },
 288     { "POSIX_V7_ILP32_OFF32_CFLAGS", _CS_POSIX_V7_ILP32_OFF32_CFLAGS, CONFSTR },
 289     { "POSIX_V7_ILP32_OFF32_LDFLAGS", _CS_POSIX_V7_ILP32_OFF32_LDFLAGS, CONFSTR },
 290     { "POSIX_V7_ILP32_OFF32_LIBS", _CS_POSIX_V7_ILP32_OFF32_LIBS, CONFSTR },
 291     { "POSIX_V7_ILP32_OFF32_LINTFLAGS", _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS, CONFSTR },
 292
 293     { "_POSIX_V7_WIDTH_RESTRICTED_ENVS", _CS_V7_WIDTH_RESTRICTED_ENVS, CONFSTR },
 294     { "POSIX_V7_WIDTH_RESTRICTED_ENVS", _CS_V7_WIDTH_RESTRICTED_ENVS, CONFSTR },
 295
 296     { "_POSIX_V7_ILP32_OFFBIG", _SC_V7_ILP32_OFFBIG, SYSCONF },
 297     { "POSIX_V7_ILP32_OFFBIG_CFLAGS", _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS, CONFSTR },
 298     { "POSIX_V7_ILP32_OFFBIG_LDFLAGS", _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS, CONFSTR },
 299     { "POSIX_V7_ILP32_OFFBIG_LIBS", _CS_POSIX_V7_ILP32_OFFBIG_LIBS, CONFSTR },
 300     { "POSIX_V7_ILP32_OFFBIG_LINTFLAGS", _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS, CONFSTR },
 301
 302     { "_POSIX_V7_LP64_OFF64", _SC_V7_LP64_OFF64, SYSCONF },
 303     { "POSIX_V7_LP64_OFF64_CFLAGS", _CS_POSIX_V7_LP64_OFF64_CFLAGS, CONFSTR },
 304     { "POSIX_V7_LP64_OFF64_LDFLAGS", _CS_POSIX_V7_LP64_OFF64_LDFLAGS, CONFSTR },
 305     { "POSIX_V7_LP64_OFF64_LIBS", _CS_POSIX_V7_LP64_OFF64_LIBS, CONFSTR },
 306     { "POSIX_V7_LP64_OFF64_LINTFLAGS", _CS_POSIX_V7_LP64_OFF64_LINTFLAGS, CONFSTR },
 307
 308     { "_POSIX_V7_LPBIG_OFFBIG", _SC_V7_LPBIG_OFFBIG, SYSCONF },
 309     { "POSIX_V7_LPBIG_OFFBIG_CFLAGS", _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS, CONFSTR },
 310     { "POSIX_V7_LPBIG_OFFBIG_LDFLAGS", _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS, CONFSTR },
 311     { "POSIX_V7_LPBIG_OFFBIG_LIBS", _CS_POSIX_V7_LPBIG_OFFBIG_LIBS, CONFSTR },
 312     { "POSIX_V7_LPBIG_OFFBIG_LINTFLAGS", _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS, CONFSTR },
 313
 314     { "_POSIX_ADVISORY_INFO", _SC_ADVISORY_INFO, SYSCONF },
 315     { "_POSIX_BARRIERS", _SC_BARRIERS, SYSCONF },
 316     { "_POSIX_BASE", _SC_BASE, SYSCONF },
 317     { "_POSIX_C_LANG_SUPPORT", _SC_C_LANG_SUPPORT, SYSCONF },
 318     { "_POSIX_C_LANG_SUPPORT_R", _SC_C_LANG_SUPPORT_R, SYSCONF },
 319     { "_POSIX_CLOCK_SELECTION", _SC_CLOCK_SELECTION, SYSCONF },
 320     { "_POSIX_CPUTIME", _SC_CPUTIME, SYSCONF },
 321     { "_POSIX_THREAD_CPUTIME", _SC_THREAD_CPUTIME, SYSCONF },
 322     { "_POSIX_DEVICE_SPECIFIC", _SC_DEVICE_SPECIFIC, SYSCONF },
 323     { "_POSIX_DEVICE_SPECIFIC_R", _SC_DEVICE_SPECIFIC_R, SYSCONF },
 324     { "_POSIX_FD_MGMT", _SC_FD_MGMT, SYSCONF },
 325     { "_POSIX_FIFO", _SC_FIFO, SYSCONF },
 326     { "_POSIX_PIPE", _SC_PIPE, SYSCONF },
 327     { "_POSIX_FILE_ATTRIBUTES", _SC_FILE_ATTRIBUTES, SYSCONF },
 328     { "_POSIX_FILE_LOCKING", _SC_FILE_LOCKING, SYSCONF },
 329     { "_POSIX_FILE_SYSTEM", _SC_FILE_SYSTEM, SYSCONF },
 330     { "_POSIX_MONOTONIC_CLOCK", _SC_MONOTONIC_CLOCK, SYSCONF },
 331     { "_POSIX_MULTI_PROCESS", _SC_MULTI_PROCESS, SYSCONF },
 332     { "_POSIX_SINGLE_PROCESS", _SC_SINGLE_PROCESS, SYSCONF },
 333     { "_POSIX_NETWORKING", _SC_NETWORKING, SYSCONF },
 334     { "_POSIX_READER_WRITER_LOCKS", _SC_READER_WRITER_LOCKS, SYSCONF },
 335     { "_POSIX_SPIN_LOCKS", _SC_SPIN_LOCKS, SYSCONF },
 336     { "_POSIX_REGEXP", _SC_REGEXP, SYSCONF },
 337     { "_REGEX_VERSION", _SC_REGEX_VERSION, SYSCONF },
 338     { "_POSIX_SHELL", _SC_SHELL, SYSCONF },
 339     { "_POSIX_SIGNALS", _SC_SIGNALS, SYSCONF },
 340     { "_POSIX_SPAWN", _SC_SPAWN, SYSCONF },
 341     { "_POSIX_SPORADIC_SERVER", _SC_SPORADIC_SERVER, SYSCONF },
 342     { "_POSIX_THREAD_SPORADIC_SERVER", _SC_THREAD_SPORADIC_SERVER, SYSCONF },
 343     { "_POSIX_SYSTEM_DATABASE", _SC_SYSTEM_DATABASE, SYSCONF },
 344     { "_POSIX_SYSTEM_DATABASE_R", _SC_SYSTEM_DATABASE_R, SYSCONF },
 345     { "_POSIX_TIMEOUTS", _SC_TIMEOUTS, SYSCONF },
 346     { "_POSIX_TYPED_MEMORY_OBJECTS", _SC_TYPED_MEMORY_OBJECTS, SYSCONF },
 347     { "_POSIX_USER_GROUPS", _SC_USER_GROUPS, SYSCONF },
 348     { "_POSIX_USER_GROUPS_R", _SC_USER_GROUPS_R, SYSCONF },
 349     { "POSIX2_PBS", _SC_2_PBS, SYSCONF },
 350     { "POSIX2_PBS_ACCOUNTING", _SC_2_PBS_ACCOUNTING, SYSCONF },
 351     { "POSIX2_PBS_LOCATE", _SC_2_PBS_LOCATE, SYSCONF },
 352     { "POSIX2_PBS_TRACK", _SC_2_PBS_TRACK, SYSCONF },
 353     { "POSIX2_PBS_MESSAGE", _SC_2_PBS_MESSAGE, SYSCONF },
 354     { "SYMLOOP_MAX", _SC_SYMLOOP_MAX, SYSCONF },
 355     { "STREAM_MAX", _SC_STREAM_MAX, SYSCONF },
 356     { "AIO_LISTIO_MAX", _SC_AIO_LISTIO_MAX, SYSCONF },
 357     { "AIO_MAX", _SC_AIO_MAX, SYSCONF },
 358     { "AIO_PRIO_DELTA_MAX", _SC_AIO_PRIO_DELTA_MAX, SYSCONF },
 359     { "DELAYTIMER_MAX", _SC_DELAYTIMER_MAX, SYSCONF },
 360     { "HOST_NAME_MAX", _SC_HOST_NAME_MAX, SYSCONF },
 361     { "LOGIN_NAME_MAX", _SC_LOGIN_NAME_MAX, SYSCONF },
 362     { "MQ_OPEN_MAX", _SC_MQ_OPEN_MAX, SYSCONF },
 363     { "MQ_PRIO_MAX", _SC_MQ_PRIO_MAX, SYSCONF },
 364     { "_POSIX_DEVICE_IO", _SC_DEVICE_IO, SYSCONF },
 365     { "_POSIX_TRACE", _SC_TRACE, SYSCONF },
 366     { "_POSIX_TRACE_EVENT_FILTER", _SC_TRACE_EVENT_FILTER, SYSCONF },
 367     { "_POSIX_TRACE_INHERIT", _SC_TRACE_INHERIT, SYSCONF },
 368     { "_POSIX_TRACE_LOG", _SC_TRACE_LOG, SYSCONF },
 369     { "RTSIG_MAX", _SC_RTSIG_MAX, SYSCONF },
 370     { "SEM_NSEMS_MAX", _SC_SEM_NSEMS_MAX, SYSCONF },
 371     { "SEM_VALUE_MAX", _SC_SEM_VALUE_MAX, SYSCONF },
 372     { "SIGQUEUE_MAX", _SC_SIGQUEUE_MAX, SYSCONF },
 373     { "FILESIZEBITS", _PC_FILESIZEBITS, PATHCONF },
 374     { "POSIX_ALLOC_SIZE_MIN", _PC_ALLOC_SIZE_MIN, PATHCONF },
 375     { "POSIX_REC_INCR_XFER_SIZE", _PC_REC_INCR_XFER_SIZE, PATHCONF },
 376     { "POSIX_REC_MAX_XFER_SIZE", _PC_REC_MAX_XFER_SIZE, PATHCONF },
 377     { "POSIX_REC_MIN_XFER_SIZE", _PC_REC_MIN_XFER_SIZE, PATHCONF },
 378     { "POSIX_REC_XFER_ALIGN", _PC_REC_XFER_ALIGN, PATHCONF },
 379     { "SYMLINK_MAX", _PC_SYMLINK_MAX, PATHCONF },
 380     { "GNU_LIBC_VERSION", _CS_GNU_LIBC_VERSION, CONFSTR },
 381     { "GNU_LIBPTHREAD_VERSION", _CS_GNU_LIBPTHREAD_VERSION, CONFSTR },
 382     { "POSIX2_SYMLINKS", _PC_2_SYMLINKS, PATHCONF },
 383
 384     { "LEVEL1_ICACHE_SIZE", _SC_LEVEL1_ICACHE_SIZE, SYSCONF },
 385     { "LEVEL1_ICACHE_ASSOC", _SC_LEVEL1_ICACHE_ASSOC, SYSCONF },
 386     { "LEVEL1_ICACHE_LINESIZE", _SC_LEVEL1_ICACHE_LINESIZE, SYSCONF },
 387     { "LEVEL1_DCACHE_SIZE", _SC_LEVEL1_DCACHE_SIZE, SYSCONF },
 388     { "LEVEL1_DCACHE_ASSOC", _SC_LEVEL1_DCACHE_ASSOC, SYSCONF },
 389     { "LEVEL1_DCACHE_LINESIZE", _SC_LEVEL1_DCACHE_LINESIZE, SYSCONF },
 390     { "LEVEL2_CACHE_SIZE", _SC_LEVEL2_CACHE_SIZE, SYSCONF },
 391     { "LEVEL2_CACHE_ASSOC", _SC_LEVEL2_CACHE_ASSOC, SYSCONF },
 392     { "LEVEL2_CACHE_LINESIZE", _SC_LEVEL2_CACHE_LINESIZE, SYSCONF },
 393     { "LEVEL3_CACHE_SIZE", _SC_LEVEL3_CACHE_SIZE, SYSCONF },
 394     { "LEVEL3_CACHE_ASSOC", _SC_LEVEL3_CACHE_ASSOC, SYSCONF },
 395     { "LEVEL3_CACHE_LINESIZE", _SC_LEVEL3_CACHE_LINESIZE, SYSCONF },
 396     { "LEVEL4_CACHE_SIZE", _SC_LEVEL4_CACHE_SIZE, SYSCONF },
 397     { "LEVEL4_CACHE_ASSOC", _SC_LEVEL4_CACHE_ASSOC, SYSCONF },
 398     { "LEVEL4_CACHE_LINESIZE", _SC_LEVEL4_CACHE_LINESIZE, SYSCONF },
 399
 400     { "IPV6", _SC_IPV6, SYSCONF },
 401     { "RAW_SOCKETS", _SC_RAW_SOCKETS, SYSCONF },
 402
 403     { "_POSIX_IPV6", _SC_IPV6, SYSCONF },
 404     { "_POSIX_RAW_SOCKETS", _SC_RAW_SOCKETS, SYSCONF },
 405
 406     { NULL, 0, SYSCONF }
 407   };
 408
 409
 410 extern const char *__progname;
 411
 412
 413 static void
 414 usage (void)
 415 {
 416   fprintf (stderr,
 417            _("Usage: %s [-v specification] variable_name [pathname]\n"),
 418            __progname);
 419   fprintf (stderr,
 420            _("       %s -a [pathname]\n"), __progname);
 421   exit (2);
 422 }
 423
 424
 425 static void
 426 print_all (const char *path)
 427 {
 428   const struct conf *c;
 429   size_t clen;
 430   long int value;
 431   char *cvalue;
 432   for (c = vars; c->name != NULL; ++c) {
 433     printf("%-35s", c->name);
 434     switch (c->call) {
 435       case PATHCONF:
 436         value = pathconf (path, c->call_name);
 437         if (value != -1) {
 438           printf("%ld", value);
 439         }
 440         printf("\n");
 441         break;
 442       case SYSCONF:
 443         value = sysconf (c->call_name);
 444         if (value == -1l) {
 445           if (c->call_name == _SC_UINT_MAX
 446             || c->call_name == _SC_ULONG_MAX)
 447             printf ("%lu", value);
 448         }
 449         else {
 450           printf ("%ld", value);
 451         }
 452         printf ("\n");
 453         break;
 454       case CONFSTR:
 455         clen = confstr (c->call_name, (char *) NULL, 0);
 456         cvalue = (char *) malloc (clen);
 457         if (cvalue == NULL)
 458           error (3, 0, _("memory exhausted"));
 459         if (confstr (c->call_name, cvalue, clen) != clen)
 460           error (3, errno, "confstr");
 461         printf ("%.*s\n", (int) clen, cvalue);
 462         free (cvalue);
 463         break;
 464     }
 465   }
 466   exit (0);
 467 }
 468
 469 int
 470 main (int argc, char *argv[])
 471 {
 472   const struct conf *c;
 473
 474   /* Set locale.  Do not set LC_ALL because the other categories must
 475      not be affected (according to POSIX.2).  */
 476   setlocale (LC_CTYPE, "");
 477   setlocale (LC_MESSAGES, "");
 478
 479   /* Initialize the message catalog.  */
 480   textdomain (PACKAGE);
 481
 482   if (argc > 1 && strcmp (argv[1], "--version") == 0)
 483     {
 484       printf ("getconf %s%s\n", PKGVERSION, VERSION);
 485       printf (gettext ("\
 486 Copyright (C) %s Free Software Foundation, Inc.\n\
 487 This is free software; see the source for copying conditions.  There is NO\n\
 488 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
 489 "), "2021");
 490       printf (gettext ("Written by %s.\n"), "Roland McGrath");
 491       return 0;
 492     }
 493
 494   if (argc > 1 && strcmp (argv[1], "--help") == 0)
 495     {
 496       printf (gettext ("\
 497 Usage: getconf [-v SPEC] VAR\n\
 498   or:  getconf [-v SPEC] PATH_VAR PATH\n\
 499 \n\
 500 Get the configuration value for variable VAR, or for variable PATH_VAR\n\
 501 for path PATH.  If SPEC is given, give values for compilation\n\
 502 environment SPEC.\n\n"));
 503       printf (gettext ("For bug reporting instructions, please see:\n\
 504 %s.\n"), REPORT_BUGS_TO);
 505       return 0;
 506     }
 507
 508 #ifdef ALL_ENVIRONMENTS_DEFINED
 509   if (argc > 1 && strncmp (argv[1], "-v", 2) == 0)
 510     {
 511       if (argv[1][2] == '\0')
 512         {
 513           if (argc < 3)
 514             usage ();
 515
 516           argv += 2;
 517           argc -= 2;
 518         }
 519       else
 520         {
 521           argv += 1;
 522           argc += 1;
 523         }
 524     }
 525 #else
 526   const char *getconf_dir = getenv ("GETCONF_DIR") ?: GETCONF_DIR;
 527   size_t getconf_dirlen = strlen (getconf_dir);
 528
 529   const char *spec = NULL;
 530   char buf[sizeof "POSIX_V6_LPBIG_OFFBIG"];
 531   char *argv0 = argv[0];
 532   if (argc > 1 && strncmp (argv[1], "-v", 2) == 0)
 533     {
 534       if (argv[1][2] == '\0')
 535         {
 536           if (argc < 3)
 537             usage ();
 538
 539           spec = argv[2];
 540           argv += 2;
 541           argc -= 2;
 542         }
 543       else
 544         {
 545           spec = &argv[1][2];
 546           argv += 1;
 547           argc += 1;
 548         }
 549     }
 550   else
 551     {
 552       char default_name[getconf_dirlen + sizeof "/default"];
 553       memcpy (mempcpy (default_name, getconf_dir, getconf_dirlen),
 554               "/default", sizeof "/default");
 555       int len = readlink (default_name, buf, sizeof buf - 1);
 556       if (len > 0)
 557         {
 558           buf[len] = '\0';
 559           spec = buf;
 560         }
 561     }
 562
 563   /* Check for the specifications we know.  */
 564   if (spec != NULL)
 565     {
 566       size_t i;
 567       for (i = 0; i < nspecs; ++i)
 568         if (strcmp (spec, specs[i].name) == 0)
 569           break;
 570
 571       if (i == nspecs)
 572         error (2, 0, _("unknown specification \"%s\""), spec);
 573
 574       switch (specs[i].num)
 575         {
 576 # ifndef _XBS5_ILP32_OFF32
 577           case _SC_XBS5_ILP32_OFF32:
 578 # endif
 579 # ifndef _XBS5_ILP32_OFFBIG
 580           case _SC_XBS5_ILP32_OFFBIG:
 581 # endif
 582 # ifndef _XBS5_LP64_OFF64
 583           case _SC_XBS5_LP64_OFF64:
 584 # endif
 585 # ifndef _XBS5_LPBIG_OFFBIG
 586           case _SC_XBS5_LPBIG_OFFBIG:
 587 # endif
 588 # ifndef _POSIX_V6_ILP32_OFF32
 589           case _SC_V6_ILP32_OFF32:
 590 # endif
 591 # ifndef _POSIX_V6_ILP32_OFFBIG
 592           case _SC_V6_ILP32_OFFBIG:
 593 # endif
 594 # ifndef _POSIX_V6_LP64_OFF64
 595           case _SC_V6_LP64_OFF64:
 596 # endif
 597 # ifndef _POSIX_V6_LPBIG_OFFBIG
 598           case _SC_V6_LPBIG_OFFBIG:
 599 # endif
 600 # ifndef _POSIX_V7_ILP32_OFF32
 601           case _SC_V7_ILP32_OFF32:
 602 # endif
 603 # ifndef _POSIX_V7_ILP32_OFFBIG
 604           case _SC_V7_ILP32_OFFBIG:
 605 # endif
 606 # ifndef _POSIX_V7_LP64_OFF64
 607           case _SC_V7_LP64_OFF64:
 608 # endif
 609 # ifndef _POSIX_V7_LPBIG_OFFBIG
 610           case _SC_V7_LPBIG_OFFBIG:
 611 # endif
 612             {
 613               const char *args[argc + 3];
 614               size_t spec_len = strlen (spec);
 615               char getconf_name[getconf_dirlen + 1 + spec_len + 1];
 616               memcpy (mempcpy (mempcpy (getconf_name, getconf_dir,
 617                                         getconf_dirlen),
 618                                "/", 1), spec, spec_len + 1);
 619               args[0] = argv0;
 620               args[1] = "-v";
 621               args[2] = spec;
 622               memcpy (&args[3], &argv[1], argc * sizeof (argv[1]));
 623               execv (getconf_name, (char * const *) args);
 624               error (4, errno, _("Couldn't execute %s"), getconf_name);
 625             }
 626           default:
 627             break;
 628         }
 629     }
 630 #endif
 631
 632   if (argc > 1 && strcmp (argv[1], "-a") == 0)
 633     {
 634       if (argc == 2)
 635         print_all ("/");
 636       else if (argc == 3)
 637         print_all (argv[2]);
 638       else
 639         usage ();
 640     }
 641
 642   int ai = 1;
 643   if (argc > ai && strcmp (argv[ai], "--") == 0)
 644     ++ai;
 645
 646   if (argc - ai < 1 || argc - ai > 2)
 647     usage ();
 648
 649   for (c = vars; c->name != NULL; ++c)
 650     if (strcmp (c->name, argv[ai]) == 0
 651         || (strncmp (c->name, "_POSIX_", 7) == 0
 652             && strcmp (c->name + 7, argv[ai]) == 0))
 653       {
 654         long int value;
 655         size_t clen;
 656         char *cvalue;
 657         switch (c->call)
 658           {
 659           case PATHCONF:
 660             if (argc - ai < 2)
 661               usage ();
 662             errno = 0;
 663             value = pathconf (argv[ai + 1], c->call_name);
 664             if (value == -1)
 665               {
 666                 if (errno)
 667                   error (3, errno, "pathconf: %s", argv[ai + 1]);
 668                 else
 669                   puts (_("undefined"));
 670               }
 671             else
 672               printf ("%ld\n", value);
 673             exit (0);
 674
 675           case SYSCONF:
 676             if (argc - ai > 1)
 677               usage ();
 678             value = sysconf (c->call_name);
 679             if (value == -1l)
 680               {
 681                 if (c->call_name == _SC_UINT_MAX
 682                     || c->call_name == _SC_ULONG_MAX)
 683                   printf ("%lu\n", value);
 684                 else
 685                   puts (_("undefined"));
 686               }
 687             else
 688               printf ("%ld\n", value);
 689             exit (0);
 690
 691           case CONFSTR:
 692             if (argc - ai > 1)
 693               usage ();
 694             clen = confstr (c->call_name, (char *) NULL, 0);
 695             cvalue = (char *) malloc (clen);
 696             if (cvalue == NULL)
 697               error (3, 0, _("memory exhausted"));
 698
 699             if (confstr (c->call_name, cvalue, clen) != clen)
 700               error (3, errno, "confstr");
 701
 702             printf ("%.*s\n", (int) clen, cvalue);
 703             exit (0);
 704           }
 705       }
 706
 707   error (2, 0, _("Unrecognized variable `%s'"), argv[ai]);
 708   /* NOTREACHED */
 709   return 2;
 710 }