examples/loadables/getconf.c

   1 /*
   2  * ORIGINAL COPYRIGHT STATEMENT:
   3  *
   4  * Copyright (c) 1994 Winning Strategies, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Winning Strategies, Inc.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * POSIX.2 getconf utility
  35  *
  36  * Originally Written by:
  37  *      J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
  38  *
  39  * Heavily modified for inclusion in bash by
  40  *      Chet Ramey <chet@po.cwru.edu>
  41  */
  42
  43 #include <stdio.h>
  44 #include <limits.h>
  45 #include <locale.h>
  46 #include <unistd.h>
  47 #include <errno.h>
  48 #include "bashansi.h"
  49 #include "shell.h"
  50 #include "builtins.h"
  51 #include "stdc.h"
  52 #include "common.h"
  53 #include "bashgetopt.h"
  54
  55 struct conf_variable
  56 {
  57   const char *name;
  58   enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT, G_UNDEF } type;
  59   long value;
  60 };
  61
  62 /* Some systems do not define these; use POSIX.2 minimum recommended values. */
  63 #ifndef _POSIX2_COLL_WEIGHTS_MAX
  64 #  define _POSIX2_COLL_WEIGHTS_MAX 2
  65 #endif
  66
  67 static const struct conf_variable conf_table[] =
  68 {
  69   /* POSIX.2 Configurable Variable Values */
  70   { "PATH",                     CONFSTR,        _CS_PATH                },
  71   { "CS_PATH",                  CONFSTR,        _CS_PATH                },
  72
  73   /* POSIX.1 Configurable Variable Values (only Solaris?) */
  74 #if defined (_CS_LFS_CFLAGS)
  75   { "LFS_CFLAGS",               CONFSTR,        _CS_LFS_CFLAGS          },
  76   { "LFS_LDFLAGS",              CONFSTR,        _CS_LFS_LDFLAGS         },
  77   { "LFS_LIBS",                 CONFSTR,        _CS_LFS_LIBS            },
  78   { "LFS_LINTFLAGS",            CONFSTR,        _CS_LFS_LINTFLAGS       },
  79 #endif
  80 #if defined (_CS_LFS64_CFLAGS)
  81   { "LFS64_CFLAGS",             CONFSTR,        _CS_LFS64_CFLAGS        },
  82   { "LFS64_LDFLAGS",            CONFSTR,        _CS_LFS64_LDFLAGS       },
  83   { "LFS64_LIBS",               CONFSTR,        _CS_LFS64_LIBS          },
  84   { "LFS64_LINTFLAGS",          CONFSTR,        _CS_LFS64_LINTFLAGS     },
  85 #endif
  86
  87   /* Single UNIX Specification version 2 Configurable Variable Values */
  88 #if defined (_CS_XBS5_ILP32_OFF32_CFLAGS)
  89   { "XBS5_ILP32_OFF32_CFLAGS",          CONFSTR,        _CS_XBS5_ILP32_OFF32_CFLAGS },
  90   { "XBS5_ILP32_OFF32_LDFLAGS",         CONFSTR,        _CS_XBS5_ILP32_OFF32_LDFLAGS },
  91   { "XBS5_ILP32_OFF32_LIBS",            CONFSTR,        _CS_XBS5_ILP32_OFF32_LIBS },
  92   { "XBS5_ILP32_OFF32_LINTFLAGS",       CONFSTR,        _CS_XBS5_ILP32_OFF32_LINTFLAGS },
  93   { "XBS5_ILP32_OFFBIG_CFLAGS",         CONFSTR,        _CS_XBS5_ILP32_OFFBIG_CFLAGS },
  94   { "XBS5_ILP32_OFFBIG_LDFLAGS",        CONFSTR,        _CS_XBS5_ILP32_OFFBIG_LDFLAGS },
  95   { "XBS5_ILP32_OFFBIG_LIBS",           CONFSTR,        _CS_XBS5_ILP32_OFFBIG_LIBS },
  96   { "XBS5_ILP32_OFFBIG_LINTFLAGS",      CONFSTR,        _CS_XBS5_ILP32_OFFBIG_LINTFLAGS },
  97   { "XBS5_LP64_OFF64_CFLAGS",           CONFSTR,        _CS_XBS5_LP64_OFF64_CFLAGS },
  98   { "XBS5_LP64_OFF64_LDFLAGS",          CONFSTR,        _CS_XBS5_LP64_OFF64_LDFLAGS },
  99   { "XBS5_LP64_OFF64_LIBS",             CONFSTR,        _CS_XBS5_LP64_OFF64_LIBS },
 100   { "XBS5_LP64_OFF64_LINTFLAGS",        CONFSTR,        _CS_XBS5_LP64_OFF64_LINTFLAGS },
 101   { "XBS5_LPBIG_OFFBIG_CFLAGS",         CONFSTR,        _CS_XBS5_LPBIG_OFFBIG_CFLAGS },
 102   { "XBS5_LPBIG_OFFBIG_LDFLAGS",        CONFSTR,        _CS_XBS5_LPBIG_OFFBIG_LDFLAGS },
 103   { "XBS5_LPBIG_OFFBIG_LIBS",           CONFSTR,        _CS_XBS5_LPBIG_OFFBIG_LIBS },
 104   { "XBS5_LPBIG_OFFBIG_LINTFLAGS",      CONFSTR,        _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS },
 105 #endif /* _CS_XBS5_ILP32_OFF32_CFLAGS */
 106
 107   /* POSIX.2 Utility Limit Minimum Values */
 108 #ifdef _POSIX2_BC_BASE_MAX
 109   { "POSIX2_BC_BASE_MAX",       CONSTANT,       _POSIX2_BC_BASE_MAX     },
 110 #else
 111   { "POSIX2_BC_BASE_MAX",       G_UNDEF,        -1                      },
 112 #endif
 113 #ifdef _POSIX2_BC_DIM_MAX
 114   { "POSIX2_BC_DIM_MAX",        CONSTANT,       _POSIX2_BC_DIM_MAX      },
 115 #else
 116   { "POSIX2_BC_DIM_MAX",        G_UNDEF,        -1                      },
 117 #endif
 118 #ifdef _POSIX2_BC_SCALE_MAX
 119   { "POSIX2_BC_SCALE_MAX",      CONSTANT,       _POSIX2_BC_SCALE_MAX    },
 120 #else
 121   { "POSIX2_BC_SCALE_MAX",      G_UNDEF,        -1                      },
 122 #endif
 123 #ifdef _POSIX2_BC_STRING_MAX
 124   { "POSIX2_BC_STRING_MAX",     CONSTANT,       _POSIX2_BC_STRING_MAX   },
 125 #else
 126   { "POSIX2_BC_STRING_MAX",     G_UNDEF,        -1                      },
 127 #endif
 128 #ifdef _POSIX2_COLL_WEIGHTS_MAX
 129   { "POSIX2_COLL_WEIGHTS_MAX",  CONSTANT,       _POSIX2_COLL_WEIGHTS_MAX },
 130 #else
 131   { "POSIX2_COLL_WEIGHTS_MAX",  G_UNDEF,        -1                       },
 132 #endif
 133 #if defined (_POSIX2_EQUIV_CLASS_MAX)
 134   { "POSIX2_EQUIV_CLASS_MAX",   CONSTANT,       _POSIX2_EQUIV_CLASS_MAX },
 135 #endif
 136 #ifdef _POSIX2_EXPR_NEST_MAX
 137   { "POSIX2_EXPR_NEST_MAX",     CONSTANT,       _POSIX2_EXPR_NEST_MAX   },
 138 #else
 139   { "POSIX2_EXPR_NEST_MAX",     G_UNDEF,        -1                      },
 140 #endif
 141 #ifdef _POSIX2_LINE_MAX
 142   { "POSIX2_LINE_MAX",          CONSTANT,       _POSIX2_LINE_MAX        },
 143 #else
 144   { "POSIX2_LINE_MAX",          G_UNDEF,        -1                      },
 145 #endif
 146 #ifdef _POSIX2_RE_DUP_MAX
 147   { "POSIX2_RE_DUP_MAX",        CONSTANT,       _POSIX2_RE_DUP_MAX      },
 148 #else
 149   { "POSIX2_RE_DUP_MAX",        G_UNDEF,        -1                      },
 150 #endif
 151 #if defined (_POSIX2_VERSION)
 152   { "POSIX2_VERSION",           CONSTANT,       _POSIX2_VERSION         },
 153 #else
 154 #  if !defined (_SC_2_VERSION)
 155   { "POSIX2_VERSION",           G_UNDEF,        -1                      },
 156 #  endif
 157 #endif
 158
 159   /* POSIX.1 Minimum Values */
 160   { "_POSIX_ARG_MAX",           CONSTANT,       _POSIX_ARG_MAX          },
 161   { "_POSIX_CHILD_MAX",         CONSTANT,       _POSIX_CHILD_MAX        },
 162   { "_POSIX_LINK_MAX",          CONSTANT,       _POSIX_LINK_MAX         },
 163   { "_POSIX_MAX_CANON",         CONSTANT,       _POSIX_MAX_CANON        },
 164   { "_POSIX_MAX_INPUT",         CONSTANT,       _POSIX_MAX_INPUT        },
 165   { "_POSIX_NAME_MAX",          CONSTANT,       _POSIX_NAME_MAX         },
 166   { "_POSIX_NGROUPS_MAX",       CONSTANT,       _POSIX_NGROUPS_MAX      },
 167   { "_POSIX_OPEN_MAX",          CONSTANT,       _POSIX_OPEN_MAX         },
 168   { "_POSIX_PATH_MAX",          CONSTANT,       _POSIX_PIPE_BUF         },
 169   { "_POSIX_PIPE_BUF",          CONSTANT,       _POSIX_PIPE_BUF         },
 170   { "_POSIX_SSIZE_MAX",         CONSTANT,       _POSIX_SSIZE_MAX        },
 171   { "_POSIX_STREAM_MAX",        CONSTANT,       _POSIX_STREAM_MAX       },
 172   { "_POSIX_TZNAME_MAX",        CONSTANT,       _POSIX_TZNAME_MAX       },
 173
 174   /* POSIX.2 Symbolic Utility Limits */
 175   { "BC_BASE_MAX",              SYSCONF,        _SC_BC_BASE_MAX         },
 176   { "BC_DIM_MAX",               SYSCONF,        _SC_BC_DIM_MAX          },
 177   { "BC_SCALE_MAX",             SYSCONF,        _SC_BC_SCALE_MAX        },
 178   { "BC_STRING_MAX",            SYSCONF,        _SC_BC_STRING_MAX       },
 179   { "COLL_WEIGHTS_MAX",         SYSCONF,        _SC_COLL_WEIGHTS_MAX    },
 180   { "EXPR_NEST_MAX",            SYSCONF,        _SC_EXPR_NEST_MAX       },
 181   { "LINE_MAX",                 SYSCONF,        _SC_LINE_MAX            },
 182   { "RE_DUP_MAX",               SYSCONF,        _SC_RE_DUP_MAX          },
 183
 184   /* POSIX.2 Optional Facility Configuration Values */
 185 #ifdef _SC_2_C_BIND
 186   { "POSIX2_C_BIND",            SYSCONF,        _SC_2_C_BIND            },
 187 #else
 188   { "POSIX2_C_BIND",            G_UNDEF,        -1                      },
 189 #endif
 190 #ifdef _SC_2_C_DEV
 191   { "POSIX2_C_DEV",             SYSCONF,        _SC_2_C_DEV             },
 192 #else
 193   { "POSIX2_C_DEV",             G_UNDEF,        -1                      },
 194 #endif
 195 #if defined (_SC_2_C_VERSION)
 196   { "POSIX2_C_VERSION",         SYSCONF,        _SC_2_C_VERSION         },
 197 #else
 198   { "POSIX2_C_VERSION",         G_UNDEF,        -1                      },
 199 #endif
 200 #if defined (_SC_2_CHAR_TERM)
 201   { "POSIX2_CHAR_TERM",         SYSCONF,        _SC_2_CHAR_TERM         },
 202 #else
 203   { "POSIX2_CHAR_TERM",         G_UNDEF,        -1                      },
 204 #endif
 205 #ifdef _SC_2_FORT_DEV
 206   { "POSIX2_FORT_DEV",          SYSCONF,        _SC_2_FORT_DEV          },
 207 #else
 208   { "POSIX2_FORT_DEV",          G_UNDEF,        -1                      },
 209 #endif
 210 #ifdef _SC_2_FORT_RUN
 211   { "POSIX2_FORT_RUN",          SYSCONF,        _SC_2_FORT_RUN          },
 212 #else
 213   { "POSIX2_FORT_RUN",          G_UNDEF,        -1                      },
 214 #endif
 215 #ifdef _SC_2_LOCALEDEF
 216   { "POSIX2_LOCALEDEF",         SYSCONF,        _SC_2_LOCALEDEF         },
 217 #else
 218   { "POSIX2_LOCALEDEF",         G_UNDEF,        -1                      },
 219 #endif
 220 #ifdef _SC_2_SW_DEV
 221   { "POSIX2_SW_DEV",            SYSCONF,        _SC_2_SW_DEV            },
 222 #else
 223   { "POSIX2_SW_DEV",            G_UNDEF,        -1                      },
 224 #endif
 225 #if defined (_SC2_UPE)
 226   { "POSIX2_UPE",               SYSCONF,        _SC_2_UPE               },
 227 #else
 228   { "POSIX2_UPE",               G_UNDEF,        -1                      },
 229 #endif
 230 #if !defined (_POSIX2_VERSION) && defined (_SC_2_VERSION)
 231   { "POSIX2_VERSION"            SYSCONF,        _SC_2_VERSION           },
 232 #endif
 233
 234   /* POSIX.1 Configurable System Variables */
 235   { "ARG_MAX",                  SYSCONF,        _SC_ARG_MAX             },
 236   { "CHILD_MAX",                SYSCONF,        _SC_CHILD_MAX           },
 237   { "CLK_TCK",                  SYSCONF,        _SC_CLK_TCK             },
 238   { "NGROUPS_MAX",              SYSCONF,        _SC_NGROUPS_MAX         },
 239   { "OPEN_MAX",                 SYSCONF,        _SC_OPEN_MAX            },
 240   { "STREAM_MAX",               SYSCONF,        _SC_STREAM_MAX          },
 241   { "TZNAME_MAX",               SYSCONF,        _SC_TZNAME_MAX          },
 242   { "_POSIX_JOB_CONTROL",       SYSCONF,        _SC_JOB_CONTROL         },
 243   { "_POSIX_SAVED_IDS",         SYSCONF,        _SC_SAVED_IDS           },
 244   { "_POSIX_VERSION",           SYSCONF,        _SC_VERSION             },
 245
 246   /* POSIX.1 Optional Facility Configuration Values */
 247 #if defined (_SC_ASYNCHRONOUS_IO)
 248   { "_POSIX_ASYNCHRONOUS_IO",   SYSCONF,        _SC_ASYNCHRONOUS_IO     },
 249 #endif
 250 #if defined (_SC_FSYNC)
 251   { "_POSIX_FSYNC",             SYSCONF,        _SC_FSYNC               },
 252 #endif
 253 #if defined (_SC_MAPPED_FILES)
 254   { "_POSIX_MAPPED_FILES",      SYSCONF,        _SC_MAPPED_FILES        },
 255 #endif
 256 #if defined (_SC_MEMLOCK)
 257   { "_POSIX_MEMLOCK",           SYSCONF,        _SC_MEMLOCK             },
 258 #endif
 259 #if defined (_SC_MEMLOCK_RANGE)
 260   { "_POSIX_MEMLOCK_RANGE",     SYSCONF,        _SC_MEMLOCK_RANGE       },
 261 #endif
 262 #if defined (_SC_MEMORY_PROTECTION)
 263   { "_POSIX_MEMORY_PROTECTION", SYSCONF,        _SC_MEMORY_PROTECTION   },
 264 #endif
 265 #if defined (_SC_MESSAGE_PASSING)
 266   { "_POSIX_MESSAGE_PASSING",   SYSCONF,        _SC_MESSAGE_PASSING     },
 267 #endif
 268 #if defined (SC_PRIORITIZED_IO)
 269   { "_POSIX_PRIORITIZED_IO",    SYSCONF,        _SC_PRIORITIZED_IO      },
 270 #endif
 271 #if defined (_SC_PRIORITY_SCHEDULING)
 272   { "_POSIX_PRIORITY_SCHEDULING", SYSCONF,      _SC_PRIORITY_SCHEDULING },
 273 #endif
 274 #if defined (_SC_REALTIME_SIGNALS)
 275   { "_POSIX_REALTIME_SIGNALS",  SYSCONF,        _SC_REALTIME_SIGNALS    },
 276 #endif
 277 #if defined (_SC_SEMAPHORES)
 278   { "_POSIX_SEMAPHORES",        SYSCONF,        _SC_SEMAPHORES          },
 279 #endif
 280 #if defined (_SC_SHARED_MEMORY_OBJECTS)
 281   { "_POSIX_SHARED_MEMORY_OBJECTS", SYSCONF,    _SC_SHARED_MEMORY_OBJECTS },
 282 #endif
 283 #if defined (_SC_SYNCHRONIZED_IO)
 284   { "_POSIX_SYNCHRONIZED_IO",   SYSCONF,        _SC_SYNCHRONIZED_IO     },
 285 #endif
 286 #if defined (_SC_TIMERS)
 287   { "_POSIX_TIMERS",            SYSCONF,        _SC_TIMERS              },
 288 #endif
 289 #if defined (_SC_THREADS)
 290   { "_POSIX_THREADS",           SYSCONF,        _SC_THREADS             },
 291 #endif
 292 #if defined (_SC_THREADS)
 293   { "_POSIX_THREAD_ATTR_STACKADDR", SYSCONF,    _SC_THREAD_ATTR_STACKADDR },
 294 #endif
 295 #if defined (_SC_THREAD_ATTR_STACKSIZE)
 296   { "_POSIX_THREAD_ATTR_STACKSIZE", SYSCONF,    _SC_THREAD_ATTR_STACKSIZE },
 297 #endif
 298 #if defined (_SC_THREAD_PRIORITY_SCHEDULING)
 299   { "_POSIX_THREAD_PRIORITY_SCHEDULING", SYSCONF, _SC_THREAD_PRIORITY_SCHEDULING },
 300 #endif
 301 #if defined (_SC_THREAD_PRIO_INHERIT)
 302   { "_POSIX_THREAD_PRIO_INHERIT", SYSCONF,      _SC_THREAD_PRIO_INHERIT },
 303 #endif
 304 #if defined (_SC_THREAD_PRIO_PROTECT)
 305   { "_POSIX_THREAD_PRIO_PROTECT", SYSCONF,      _SC_THREAD_PRIO_PROTECT },
 306 #endif
 307 #if defined (_SC_THREAD_PROCESS_SHARED)
 308   { "_POSIX_THREAD_PROCESS_SHARED", SYSCONF,    _SC_THREAD_PROCESS_SHARED },
 309 #endif
 310 #if defined (_SC_THREAD_SAFE_FUNCTIONS)
 311   { "_POSIX_THREAD_SAFE_FUNCTIONS", SYSCONF,    _SC_THREAD_SAFE_FUNCTIONS },
 312 #endif
 313
 314   /* XPG 4.2 Configurable System Variables. */
 315 #if defined (_SC_ATEXIT_MAX)
 316   { "ATEXIT_MAX",               SYSCONF,        _SC_ATEXIT_MAX          },
 317 #endif
 318 #if defined (_SC_IOV_MAX)
 319   { "IOV_MAX",                  SYSCONF,        _SC_IOV_MAX             },
 320 #endif
 321 #if defined (_SC_PAGESIZE)
 322   { "PAGESIZE",                 SYSCONF,        _SC_PAGESIZE            },
 323 #endif
 324 #if defined (_SC_PAGE_SIZE)
 325   { "PAGE_SIZE",                SYSCONF,        _SC_PAGE_SIZE           },
 326 #endif
 327
 328 #if defined (_SC_AIO_LISTIO_MAX)
 329   { "AIO_LISTIO_MAX",           SYSCONF,        _SC_AIO_LISTIO_MAX      },
 330 #endif
 331 #if defined (_SC_AIO_MAX)
 332   { "AIO_MAX",                  SYSCONF,        _SC_AIO_MAX             },
 333 #endif
 334 #if defined (_SC_AIO_PRIO_DELTA_MAX)
 335   { "AIO_PRIO_DELTA_MAX",       SYSCONF,        _SC_AIO_PRIO_DELTA_MAX  },
 336 #endif
 337 #if defined (_SC_DELAYTIMER_MAX)
 338   { "DELAYTIMER_MAX",           SYSCONF,        _SC_DELAYTIMER_MAX      },
 339 #endif
 340 #if defined (_SC_GETGR_R_SIZE_MAX)
 341   { "GETGR_R_SIZE_MAX",         SYSCONF,        _SC_GETGR_R_SIZE_MAX    },
 342 #endif
 343 #if defined (_SC_GETPW_R_SIZE_MAX)
 344   { "GETPW_R_SIZE_MAX",         SYSCONF,        _SC_GETPW_R_SIZE_MAX    },
 345 #endif
 346 #if defined (_SC_MQ_OPEN_MAX)
 347   { "MQ_OPEN_MAX",              SYSCONF,        _SC_MQ_OPEN_MAX         },
 348 #endif
 349 #if defined (_SC_MQ_PRIO_MAX)
 350   { "MQ_PRIO_MAX",              SYSCONF,        _SC_MQ_PRIO_MAX         },
 351 #endif
 352 #if defined (_SC_RTSIG_MAX)
 353   { "RTSIG_MAX",                SYSCONF,        _SC_RTSIG_MAX           },
 354 #endif
 355 #if defined (_SC_SEM_NSEMS_MAX)
 356   { "SEM_NSEMS_MAX",            SYSCONF,        _SC_SEM_NSEMS_MAX       },
 357 #endif
 358 #if defined (_SC_SEM_VALUE_MAX)
 359   { "SEM_VALUE_MAX",            SYSCONF,        _SC_SEM_VALUE_MAX       },
 360 #endif
 361 #if defined (_SC_SIGQUEUE_MAX)
 362   { "SIGQUEUE_MAX",             SYSCONF,        _SC_SIGQUEUE_MAX        },
 363 #endif
 364 #if defined (_SC_TIMER_MAX)
 365   { "TIMER_MAX",                SYSCONF,        _SC_TIMER_MAX           },
 366 #endif
 367
 368 #if defined (_SC_LOGIN_NAME_MAX)
 369   { "LOGIN_NAME_MAX",           SYSCONF,        _SC_LOGIN_NAME_MAX      },
 370 #endif
 371 #if defined (_SC_LOGNAME_MAX)
 372   { "LOGNAME_MAX",              SYSCONF,        _SC_LOGNAME_MAX         },
 373 #endif
 374 #if defined (_SC_TTY_NAME_MAX)
 375   { "TTY_NAME_MAX",             SYSCONF,        _SC_TTY_NAME_MAX        },
 376 #endif
 377
 378 #if defined (_SC_THREAD_DESTRUCTOR_ITERATIONS)
 379   { "PTHREAD_DESTRUCTOR_ITERATIONS", SYSCONF,   _SC_THREAD_DESTRUCTOR_ITERATIONS },
 380 #endif
 381 #if defined (_SC_THREAD_KEYS_MAX)
 382   { "PTHREAD_KEYS_MAX",         SYSCONF,        _SC_THREAD_KEYS_MAX },
 383 #endif
 384 #if defined (_SC_THREAD_STACK_MIN)
 385   { "PTHREAD_STACK_MIN",        SYSCONF,        _SC_THREAD_STACK_MIN },
 386 #endif
 387 #if defined (_SC_THREAD_THREADS_MAX)
 388   { "PTHREAD_THREADS_MAX",      SYSCONF,        _SC_THREAD_THREADS_MAX },
 389 #endif
 390
 391   /* XPG 4.2 Optional Facility Configuration Values */
 392 #if defined (_SC_XOPEN_UNIX)
 393   { "_XOPEN_UNIX",              SYSCONF,        _SC_XOPEN_UNIX          },
 394   { "_XOPEN_CRYPT",             SYSCONF,        _SC_XOPEN_CRYPT         },
 395   { "_XOPEN_ENH_I18N",          SYSCONF,        _SC_XOPEN_ENH_I18N      },
 396   { "_XOPEN_SHM",               SYSCONF,        _SC_XOPEN_SHM           },
 397   { "_XOPEN_VERSION",           SYSCONF,        _SC_XOPEN_VERSION       },
 398 #  if defined (_SC_XOPEN_XCU_VERSION)
 399   { "_XOPEN_XCU_VERSION",       SYSCONF,        _SC_XOPEN_XCU_VERSION   },
 400 #  endif
 401 #endif
 402 #if defined (_SC_XOPEN_REALTIME)
 403   { "_XOPEN_REALTIME",          SYSCONF,        _SC_XOPEN_REALTIME      },
 404   { "_XOPEN_REALTIME_THREADS",  SYSCONF,        _SC_XOPEN_REALTIME_THREADS },
 405 #endif
 406 #if defined (_SC_XOPEN_LEGACY)
 407   { "_XOPEN_LEGACY",            SYSCONF,        _SC_XOPEN_LEGACY        },
 408 #endif /* _SC_XOPEN_LEGACY */
 409
 410   /* Single UNIX Specification version 2 Optional Facility Configuration Values */
 411 #if defined (_SC_XBS5_ILP32_OFF32)
 412   { "_XBS5_ILP32_OFF32",        SYSCONF,        _SC_XBS5_ILP32_OFF32    },
 413   { "_XBS5_ILP32_OFFBIG",       SYSCONF,        _SC_XBS5_ILP32_OFFBIG   },
 414   { "_XBS5_LP64_OFF64",         SYSCONF,        _SC_XBS5_LP64_OFF64     },
 415   { "_XBS5_LPBIG_OFFBIG",       SYSCONF,        _SC_XBS5_LPBIG_OFFBIG   },
 416 #endif /* _SC_XBS5_ILP32_OFF32 */
 417
 418   /* POSIX.1 Configurable Pathname Values */
 419   { "LINK_MAX",                 PATHCONF,       _PC_LINK_MAX            },
 420   { "MAX_CANON",                PATHCONF,       _PC_MAX_CANON           },
 421   { "MAX_INPUT",                PATHCONF,       _PC_MAX_INPUT           },
 422   { "NAME_MAX",                 PATHCONF,       _PC_NAME_MAX            },
 423   { "PATH_MAX",                 PATHCONF,       _PC_PATH_MAX            },
 424   { "PIPE_BUF",                 PATHCONF,       _PC_PIPE_BUF            },
 425   { "_POSIX_CHOWN_RESTRICTED",  PATHCONF,       _PC_CHOWN_RESTRICTED    },
 426   { "_POSIX_NO_TRUNC",          PATHCONF,       _PC_NO_TRUNC            },
 427   { "_POSIX_VDISABLE",          PATHCONF,       _PC_VDISABLE            },
 428
 429   /* XPG 4.2 Configurable Pathname Values */
 430 #if defined (_PC_FILESIZEBITS)
 431   { "FILESIZEBITS",             PATHCONF,       _PC_FILESIZEBITS },
 432 #endif
 433 #if defined (_PC_ASYNC_IO)
 434   { "_POSIX_ASYNC_IO",          PATHCONF,       _PC_ASYNC_IO },
 435 #endif
 436 #if defined (_PC_PRIO_IO)
 437   { "_POSIX_PRIO_IO",           PATHCONF,       _PC_PRIO_IO },
 438 #endif
 439 #if defined (_PC_SYNC_IO)
 440   { "_POSIX_SYNC_IO",           PATHCONF,       _PC_SYNC_IO },
 441 #endif
 442
 443   { NULL }
 444 };
 445
 446 static int num_getconf_variables = sizeof(conf_table) / sizeof(struct conf_variable) - 1;
 447
 448 extern char *this_command_name;
 449 extern char *xmalloc ();
 450 extern char **make_builtin_argv ();
 451
 452 static void getconf_help ();
 453 static int getconf_print ();
 454 static int getconf_one ();
 455 static int getconf_all ();
 456
 457 int
 458 getconf_builtin (list)
 459      WORD_LIST *list;
 460 {
 461   int c, r, opt, aflag;
 462   char **v;
 463
 464   aflag = 0;
 465   reset_internal_getopt();
 466   while ((opt = internal_getopt (list, "ah")) != -1) {
 467         switch (opt) {
 468         case 'a':
 469                 aflag = 1;
 470                 break;
 471         case 'h':
 472                 getconf_help();
 473                 return(EXECUTION_SUCCESS);
 474         default:
 475                 builtin_usage();
 476                 return(EX_USAGE);
 477         }
 478   }
 479
 480   list = loptend;
 481   if ((aflag == 0 && list == 0) || (aflag && list) || list_length(list) > 2) {
 482         builtin_usage();
 483         return(EX_USAGE);
 484   }
 485
 486   r = aflag ? getconf_all() : getconf_one(list);
 487
 488   return r;
 489 }
 490
 491 static void
 492 getconf_help()
 493 {
 494         const struct conf_variable *cp;
 495         register int i, column;
 496
 497         builtin_usage();
 498         printf("Acceptable variable names are:\n");
 499         for (cp = conf_table; cp->name != NULL; cp++) {
 500                 if (cp->type == PATHCONF)
 501                         printf("%s pathname\n", cp->name);
 502                 else
 503                         printf("%s\n", cp->name);
 504         }
 505 }
 506
 507 static int
 508 getconf_print(cp, vpath, all)
 509 struct conf_variable *cp;
 510 char *vpath;
 511 int all;
 512 {
 513         long val;
 514         char *sval;
 515         size_t slen;
 516
 517         switch (cp->type) {
 518         case G_UNDEF:
 519                 printf("undefined\n");
 520                 break;
 521
 522         case CONSTANT:
 523                 printf("%ld\n", cp->value);
 524                 break;
 525
 526         case CONFSTR:
 527                 errno = 0;
 528                 slen = confstr (cp->value, (char *) 0, (size_t) 0);
 529                 if (slen == 0) {
 530                         if (errno != 0) {
 531                                 if (all)
 532                                         printf ("getconf: %s\n", strerror(errno));
 533                                 else
 534                                         builtin_error ("%s", strerror(errno));
 535                         } else
 536                                 printf ("undefined\n");
 537                         return (EXECUTION_FAILURE);
 538                 }
 539                 sval = xmalloc(slen);
 540
 541                 confstr(cp->value, sval, slen);
 542                 printf("%s\n", sval);
 543                 free(sval);
 544                 break;
 545
 546         case SYSCONF:
 547                 errno = 0;
 548                 if ((val = sysconf(cp->value)) == -1) {
 549                         if (errno != 0) {
 550                                 if (all)
 551                                         printf("getconf: %s\n", strerror (errno));
 552                                 else
 553                                         builtin_error ("%s", strerror (errno));
 554                                 return (EXECUTION_FAILURE);
 555                         }
 556
 557                         printf ("undefined\n");
 558                 } else {
 559                         printf("%ld\n", val);
 560                 }
 561                 break;
 562
 563         case PATHCONF:
 564                 errno = 0;
 565                 if ((val = pathconf(vpath, cp->value)) == -1) {
 566                         if (errno != 0) {
 567                                 if (all)
 568                                         printf("getconf: %s: %s\n", vpath, strerror (errno));
 569                                 else
 570                                         builtin_error ("%s: %s", vpath, strerror (errno));
 571                                 return (EXECUTION_FAILURE);
 572                         }
 573
 574                         printf ("undefined\n");
 575                 } else {
 576                         printf ("%ld\n", val);
 577                 }
 578                 break;
 579         }
 580
 581         return ((ferror(stdout) || cp->type == G_UNDEF) ? EXECUTION_FAILURE
 582                                                         : EXECUTION_SUCCESS);
 583 }
 584
 585 static int
 586 getconf_all()
 587 {
 588         const struct conf_variable *cp;
 589         int ret;
 590
 591         ret = EXECUTION_SUCCESS;
 592         for (cp = conf_table; cp->name != NULL; cp++) {
 593                 printf("%-35s", cp->name);
 594                 if (getconf_print(cp, ".", 1) == EXECUTION_FAILURE)
 595                         ret = EXECUTION_FAILURE;
 596         }
 597         return ret;
 598 }
 599
 600 static int
 601 getconf_one(list)
 602         WORD_LIST *list;
 603 {
 604         const struct conf_variable *cp;
 605         char *vname, *vpath;
 606
 607         vname = list->word->word;
 608         vpath = (list->next && list->next->word) ? list->next->word->word
 609                                                  : (char *)NULL;
 610
 611         for (cp = conf_table; cp->name != NULL; cp++) {
 612                 if (strcmp(vname, cp->name) == 0)
 613                         break;
 614         }
 615         if (cp->name == NULL) {
 616                 builtin_error ("%s: unknown variable", vname);
 617                 return (EXECUTION_FAILURE);
 618         }
 619
 620         if (cp->type == PATHCONF) {
 621                 if (list->next == 0) {
 622                         builtin_usage();
 623                         return(EX_USAGE);
 624                 }
 625         } else {
 626                 if (list->next) {
 627                         builtin_usage();
 628                         return(EX_USAGE);
 629                 }
 630         }
 631
 632         return (getconf_print(cp, vpath, 0));
 633 }
 634
 635 static char *getconf_doc[] = {
 636         "getconf writes the current value of a configurable system limit or",
 637         "option variable to the standard output.",
 638         (char *)NULL
 639 };
 640
 641 struct builtin getconf_struct = {
 642         "getconf",
 643         getconf_builtin,
 644         BUILTIN_ENABLED,
 645         getconf_doc,
 646         "getconf -a or getconf -h or getconf sysvar or getconf pathvar pathname",
 647         0
 648 };