usr.bin/getconf/getconf.c

   1 /*      $NetBSD: getconf.c,v 1.31 2008/01/15 03:37:12 rmind Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by J.T. Conklin.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *        This product includes software developed by the NetBSD
  21  *        Foundation, Inc. and its contributors.
  22  * 4. Neither the name of The NetBSD Foundation nor the names of its
  23  *    contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36  * POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 __RCSID("$NetBSD: getconf.c,v 1.31 2008/01/15 03:37:12 rmind Exp $");
  42 #endif /* not lint */
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <limits.h>
  47 #include <locale.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <unistd.h>
  51 #include <string.h>
  52
  53 struct conf_variable
  54 {
  55   const char *name;
  56   enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
  57   long value;
  58 };
  59
  60 static void print_longvar(const char *, long);
  61 static void print_strvar(const char *, const char *);
  62 static void printvar(const struct conf_variable *, const char *);
  63 static void usage(void) __dead;
  64
  65 static const struct conf_variable conf_table[] =
  66 {
  67   { "PATH",                     CONFSTR,        _CS_PATH                },
  68
  69   /* Utility Limit Minimum Values */
  70   { "POSIX2_BC_BASE_MAX",       CONSTANT,       _POSIX2_BC_BASE_MAX     },
  71   { "POSIX2_BC_DIM_MAX",        CONSTANT,       _POSIX2_BC_DIM_MAX      },
  72   { "POSIX2_BC_SCALE_MAX",      CONSTANT,       _POSIX2_BC_SCALE_MAX    },
  73   { "POSIX2_BC_STRING_MAX",     CONSTANT,       _POSIX2_BC_STRING_MAX   },
  74   { "POSIX2_COLL_WEIGHTS_MAX",  CONSTANT,       _POSIX2_COLL_WEIGHTS_MAX },
  75   { "POSIX2_EXPR_NEST_MAX",     CONSTANT,       _POSIX2_EXPR_NEST_MAX   },
  76   { "POSIX2_LINE_MAX",          CONSTANT,       _POSIX2_LINE_MAX        },
  77   { "POSIX2_RE_DUP_MAX",        CONSTANT,       _POSIX2_RE_DUP_MAX      },
  78   { "POSIX2_VERSION",           CONSTANT,       _POSIX2_VERSION         },
  79
  80   /* POSIX.1 Minimum Values */
  81   { "_POSIX_AIO_LISTIO_MAX",    CONSTANT,       _POSIX_AIO_LISTIO_MAX   },
  82   { "_POSIX_AIO_MAX",           CONSTANT,       _POSIX_AIO_MAX          },
  83   { "_POSIX_ARG_MAX",           CONSTANT,       _POSIX_ARG_MAX          },
  84   { "_POSIX_CHILD_MAX",         CONSTANT,       _POSIX_CHILD_MAX        },
  85   { "_POSIX_LINK_MAX",          CONSTANT,       _POSIX_LINK_MAX         },
  86   { "_POSIX_MAX_CANON",         CONSTANT,       _POSIX_MAX_CANON        },
  87   { "_POSIX_MAX_INPUT",         CONSTANT,       _POSIX_MAX_INPUT        },
  88   { "_POSIX_MQ_OPEN_MAX",       CONSTANT,       _POSIX_MQ_OPEN_MAX      },
  89   { "_POSIX_MQ_PRIO_MAX",       CONSTANT,       _POSIX_MQ_PRIO_MAX      },
  90   { "_POSIX_NAME_MAX",          CONSTANT,       _POSIX_NAME_MAX         },
  91   { "_POSIX_NGROUPS_MAX",       CONSTANT,       _POSIX_NGROUPS_MAX      },
  92   { "_POSIX_OPEN_MAX",          CONSTANT,       _POSIX_OPEN_MAX         },
  93   { "_POSIX_PATH_MAX",          CONSTANT,       _POSIX_PATH_MAX         },
  94   { "_POSIX_PIPE_BUF",          CONSTANT,       _POSIX_PIPE_BUF         },
  95   { "_POSIX_SSIZE_MAX",         CONSTANT,       _POSIX_SSIZE_MAX        },
  96   { "_POSIX_STREAM_MAX",        CONSTANT,       _POSIX_STREAM_MAX       },
  97   { "_POSIX_TZNAME_MAX",        CONSTANT,       _POSIX_TZNAME_MAX       },
  98
  99   /* Symbolic Utility Limits */
 100   { "BC_BASE_MAX",              SYSCONF,        _SC_BC_BASE_MAX         },
 101   { "BC_DIM_MAX",               SYSCONF,        _SC_BC_DIM_MAX          },
 102   { "BC_SCALE_MAX",             SYSCONF,        _SC_BC_SCALE_MAX        },
 103   { "BC_STRING_MAX",            SYSCONF,        _SC_BC_STRING_MAX       },
 104   { "COLL_WEIGHTS_MAX",         SYSCONF,        _SC_COLL_WEIGHTS_MAX    },
 105   { "EXPR_NEST_MAX",            SYSCONF,        _SC_EXPR_NEST_MAX       },
 106   { "LINE_MAX",                 SYSCONF,        _SC_LINE_MAX            },
 107   { "RE_DUP_MAX",               SYSCONF,        _SC_RE_DUP_MAX          },
 108
 109   /* Optional Facility Configuration Values */
 110   { "POSIX2_C_BIND",            SYSCONF,        _SC_2_C_BIND            },
 111   { "POSIX2_C_DEV",             SYSCONF,        _SC_2_C_DEV             },
 112   { "POSIX2_CHAR_TERM",         SYSCONF,        _SC_2_CHAR_TERM         },
 113   { "POSIX2_FORT_DEV",          SYSCONF,        _SC_2_FORT_DEV          },
 114   { "POSIX2_FORT_RUN",          SYSCONF,        _SC_2_FORT_RUN          },
 115   { "POSIX2_LOCALEDEF",         SYSCONF,        _SC_2_LOCALEDEF         },
 116   { "POSIX2_SW_DEV",            SYSCONF,        _SC_2_SW_DEV            },
 117   { "POSIX2_UPE",               SYSCONF,        _SC_2_UPE               },
 118
 119   /* POSIX.1 Configurable System Variables */
 120   { "AIO_LISTIO_MAX",           SYSCONF,        _SC_AIO_LISTIO_MAX      },
 121   { "AIO_MAX",                  SYSCONF,        _SC_AIO_MAX             },
 122   { "ARG_MAX",                  SYSCONF,        _SC_ARG_MAX             },
 123   { "CHILD_MAX",                SYSCONF,        _SC_CHILD_MAX           },
 124   { "CLK_TCK",                  SYSCONF,        _SC_CLK_TCK             },
 125   { "MQ_OPEN_MAX",              SYSCONF,        _SC_MQ_OPEN_MAX         },
 126   { "MQ_PRIO_MAX",              SYSCONF,        _SC_MQ_PRIO_MAX         },
 127   { "NGROUPS_MAX",              SYSCONF,        _SC_NGROUPS_MAX         },
 128   { "OPEN_MAX",                 SYSCONF,        _SC_OPEN_MAX            },
 129   { "STREAM_MAX",               SYSCONF,        _SC_STREAM_MAX          },
 130   { "TZNAME_MAX",               SYSCONF,        _SC_TZNAME_MAX          },
 131   { "_POSIX_JOB_CONTROL",       SYSCONF,        _SC_JOB_CONTROL         },
 132   { "_POSIX_SAVED_IDS",         SYSCONF,        _SC_SAVED_IDS           },
 133   { "_POSIX_VERSION",           SYSCONF,        _SC_VERSION             },
 134
 135   { "LINK_MAX",                 PATHCONF,       _PC_LINK_MAX            },
 136   { "MAX_CANON",                PATHCONF,       _PC_MAX_CANON           },
 137   { "MAX_INPUT",                PATHCONF,       _PC_MAX_INPUT           },
 138   { "NAME_MAX",                 PATHCONF,       _PC_NAME_MAX            },
 139   { "PATH_MAX",                 PATHCONF,       _PC_PATH_MAX            },
 140   { "PIPE_BUF",                 PATHCONF,       _PC_PIPE_BUF            },
 141   { "_POSIX_CHOWN_RESTRICTED",  PATHCONF,       _PC_CHOWN_RESTRICTED    },
 142   { "_POSIX_NO_TRUNC",          PATHCONF,       _PC_NO_TRUNC            },
 143   { "_POSIX_VDISABLE",          PATHCONF,       _PC_VDISABLE            },
 144
 145   /* POSIX.1b Configurable System Variables */
 146   { "PAGESIZE",                 SYSCONF,        _SC_PAGESIZE            },
 147   { "_POSIX_ASYNCHRONOUS_IO",   SYSCONF,        _SC_ASYNCHRONOUS_IO     },
 148   { "_POSIX_FSYNC",             SYSCONF,        _SC_FSYNC               },
 149   { "_POSIX_MAPPED_FILES",      SYSCONF,        _SC_MAPPED_FILES        },
 150   { "_POSIX_MEMLOCK",           SYSCONF,        _SC_MEMLOCK             },
 151   { "_POSIX_MEMLOCK_RANGE",     SYSCONF,        _SC_MEMLOCK_RANGE       },
 152   { "_POSIX_MEMORY_PROTECTION", SYSCONF,        _SC_MEMORY_PROTECTION   },
 153   { "_POSIX_MESSAGE_PASSING",   SYSCONF,        _SC_MESSAGE_PASSING     },
 154   { "_POSIX_MONOTONIC_CLOCK",   SYSCONF,        _SC_MONOTONIC_CLOCK     },
 155   { "_POSIX_PRIORITY_SCHEDULING", SYSCONF,      _SC_PRIORITY_SCHEDULING },
 156   { "_POSIX_SEMAPHORES",        SYSCONF,        _SC_SEMAPHORES          },
 157   { "_POSIX_SYNCHRONIZED_IO",   SYSCONF,        _SC_SYNCHRONIZED_IO     },
 158   { "_POSIX_TIMERS",            SYSCONF,        _SC_TIMERS              },
 159
 160   { "_POSIX_SYNC_IO",           PATHCONF,       _PC_SYNC_IO             },
 161
 162   /* POSIX.1c Configurable System Variables */
 163   { "LOGIN_NAME_MAX",           SYSCONF,        _SC_LOGIN_NAME_MAX      },
 164   { "_POSIX_THREADS",           SYSCONF,        _SC_THREADS             },
 165
 166   /* POSIX.1j Configurable System Variables */
 167   { "_POSIX_BARRIERS",          SYSCONF,        _SC_BARRIERS            },
 168   { "_POSIX_READER_WRITER_LOCKS", SYSCONF,      _SC_READER_WRITER_LOCKS },
 169   { "_POSIX_SPIN_LOCKS",        SYSCONF,        _SC_SPIN_LOCKS          },
 170
 171   /* XPG4.2 Configurable System Variables */
 172   { "IOV_MAX",                  SYSCONF,        _SC_IOV_MAX             },
 173   { "PAGE_SIZE",                SYSCONF,        _SC_PAGE_SIZE           },
 174   { "_XOPEN_SHM",               SYSCONF,        _SC_XOPEN_SHM           },
 175
 176   /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
 177   { "FILESIZEBITS",             PATHCONF,       _PC_FILESIZEBITS        },
 178
 179   /* POSIX.1-2001 XSI Option Group Configurable System Variables */
 180   { "ATEXIT_MAX",               SYSCONF,        _SC_ATEXIT_MAX          },
 181
 182   /* POSIX.1-2001 TSF Configurable System Variables */
 183   { "GETGR_R_SIZE_MAX",         SYSCONF,        _SC_GETGR_R_SIZE_MAX    },
 184   { "GETPW_R_SIZE_MAX",         SYSCONF,        _SC_GETPW_R_SIZE_MAX    },
 185
 186 #ifdef _NETBSD_SOURCE
 187   /* Commonly provided extensions */
 188   { "NPROCESSORS_CONF",         SYSCONF,        _SC_NPROCESSORS_CONF    },
 189   { "NPROCESSORS_ONLN",         SYSCONF,        _SC_NPROCESSORS_ONLN    },
 190 #endif  /* _NETBSD_SOURCE */
 191
 192   { NULL, CONSTANT, 0L }
 193 };
 194
 195 static int a_flag = 0;          /* list all variables */
 196
 197 int
 198 main(int argc, char **argv)
 199 {
 200         int ch;
 201         const struct conf_variable *cp;
 202         const char *varname, *pathname;
 203         int found;
 204
 205         setprogname(argv[0]);
 206         (void)setlocale(LC_ALL, "");
 207
 208         while ((ch = getopt(argc, argv, "a")) != -1) {
 209                 switch (ch) {
 210                 case 'a':
 211                         a_flag = 1;
 212                         break;
 213                 case '?':
 214                 default:
 215                         usage();
 216                 }
 217         }
 218         argc -= optind;
 219         argv += optind;
 220
 221         if (!a_flag) {
 222                 if (argc == 0)
 223                         usage();
 224                 varname = argv[0];
 225                 argc--;
 226                 argv++;
 227         } else
 228                 varname = NULL;
 229
 230         if (argc > 1)
 231                 usage();
 232         pathname = argv[0];     /* may be NULL */
 233
 234         found = 0;
 235         for (cp = conf_table; cp->name != NULL; cp++) {
 236                 if (a_flag || strcmp(varname, cp->name) == 0) {
 237                         /*LINTED weird expression*/
 238                         if ((cp->type == PATHCONF) == (pathname != NULL)) {
 239                                 printvar(cp, pathname);
 240                                 found = 1;
 241                         } else if (!a_flag)
 242                                 errx(EXIT_FAILURE,
 243                                     "%s: invalid variable type", cp->name);
 244                 }
 245         }
 246
 247         if (!a_flag && !found)
 248                 errx(EXIT_FAILURE, "%s: unknown variable", varname);
 249
 250         (void)fflush(stdout);
 251         return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS;
 252 }
 253
 254 static void
 255 print_longvar(const char *name, long value)
 256 {
 257         if (a_flag)
 258                 (void)printf("%s = %ld\n", name, value);
 259         else
 260                 (void)printf("%ld\n", value);
 261 }
 262
 263 static void
 264 print_strvar(const char *name, const char *sval)
 265 {
 266         if (a_flag)
 267                 (void)printf("%s = %s\n", name, sval);
 268         else
 269                 (void)printf("%s\n", sval);
 270 }
 271
 272 static void
 273 printvar(const struct conf_variable *cp, const char *pathname)
 274 {
 275         size_t slen;
 276         char *sval;
 277         long val;
 278
 279         switch (cp->type) {
 280         case CONSTANT:
 281                 print_longvar(cp->name, cp->value);
 282                 break;
 283
 284         case CONFSTR:
 285                 errno = 0;
 286                 slen = confstr((int)cp->value, NULL, 0);
 287                 if (slen == 0) {
 288                         if (errno != 0)
 289
 290 out:                            err(EXIT_FAILURE, "confstr(%ld)", cp->value);
 291                         else
 292                                 print_strvar(cp->name, "undefined");
 293                 }
 294
 295                 if ((sval = malloc(slen)) == NULL)
 296                         err(EXIT_FAILURE, "Can't allocate %zu bytes", slen);
 297
 298                 errno = 0;
 299                 if (confstr((int)cp->value, sval, slen) == 0) {
 300                         if (errno != 0)
 301                                 goto out;
 302                         else
 303                                 print_strvar(cp->name, "undefined");
 304                 } else
 305                         print_strvar(cp->name, sval);
 306
 307                 free(sval);
 308                 break;
 309
 310         case SYSCONF:
 311                 errno = 0;
 312                 if ((val = sysconf((int)cp->value)) == -1) {
 313                         if (errno != 0)
 314                                 err(EXIT_FAILURE, "sysconf(%ld)", cp->value);
 315                         print_strvar(cp->name, "undefined");
 316                 } else
 317                         print_longvar(cp->name, val);
 318                 break;
 319
 320         case PATHCONF:
 321                 errno = 0;
 322                 if ((val = pathconf(pathname, (int)cp->value)) == -1) {
 323                         if (errno != 0) {
 324                                 if (a_flag && errno == EINVAL) {
 325                                         /* Just skip invalid variables */
 326                                         return;
 327                                 }
 328                                 err(EXIT_FAILURE, "pathconf(%s, %ld)",
 329                                     pathname, cp->value);
 330                                 /* NOTREACHED */
 331                         }
 332
 333                         print_strvar(cp->name, "undefined");
 334                 } else
 335                         print_longvar(cp->name, val);
 336                 break;
 337         }
 338 }
 339
 340
 341 static void
 342 usage(void)
 343 {
 344         const char *p = getprogname();
 345         (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n"
 346             "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p);
 347         exit(EXIT_FAILURE);
 348 }