usr.bin/getconf/getconf.c

   1 /*      $NetBSD: getconf.c,v 1.33 2008/04/28 20:24:13 martin 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __RCSID("$NetBSD: getconf.c,v 1.33 2008/04/28 20:24:13 martin Exp $");
  35 #endif /* not lint */
  36
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <limits.h>
  40 #include <locale.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <unistd.h>
  44 #include <string.h>
  45
  46 struct conf_variable
  47 {
  48   const char *name;
  49   enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
  50   long value;
  51 };
  52
  53 static void print_longvar(const char *, long);
  54 static void print_strvar(const char *, const char *);
  55 static void printvar(const struct conf_variable *, const char *);
  56 static void usage(void) __dead;
  57
  58 static const struct conf_variable conf_table[] =
  59 {
  60   { "PATH",                     CONFSTR,        _CS_PATH                },
  61
  62   /* Utility Limit Minimum Values */
  63   { "POSIX2_BC_BASE_MAX",       CONSTANT,       _POSIX2_BC_BASE_MAX     },
  64   { "POSIX2_BC_DIM_MAX",        CONSTANT,       _POSIX2_BC_DIM_MAX      },
  65   { "POSIX2_BC_SCALE_MAX",      CONSTANT,       _POSIX2_BC_SCALE_MAX    },
  66   { "POSIX2_BC_STRING_MAX",     CONSTANT,       _POSIX2_BC_STRING_MAX   },
  67   { "POSIX2_COLL_WEIGHTS_MAX",  CONSTANT,       _POSIX2_COLL_WEIGHTS_MAX },
  68   { "POSIX2_EXPR_NEST_MAX",     CONSTANT,       _POSIX2_EXPR_NEST_MAX   },
  69   { "POSIX2_LINE_MAX",          CONSTANT,       _POSIX2_LINE_MAX        },
  70   { "POSIX2_RE_DUP_MAX",        CONSTANT,       _POSIX2_RE_DUP_MAX      },
  71   { "POSIX2_VERSION",           CONSTANT,       _POSIX2_VERSION         },
  72
  73   /* POSIX.1 Minimum Values */
  74   { "_POSIX_AIO_LISTIO_MAX",    CONSTANT,       _POSIX_AIO_LISTIO_MAX   },
  75   { "_POSIX_AIO_MAX",           CONSTANT,       _POSIX_AIO_MAX          },
  76   { "_POSIX_ARG_MAX",           CONSTANT,       _POSIX_ARG_MAX          },
  77   { "_POSIX_CHILD_MAX",         CONSTANT,       _POSIX_CHILD_MAX        },
  78   { "_POSIX_LINK_MAX",          CONSTANT,       _POSIX_LINK_MAX         },
  79   { "_POSIX_MAX_CANON",         CONSTANT,       _POSIX_MAX_CANON        },
  80   { "_POSIX_MAX_INPUT",         CONSTANT,       _POSIX_MAX_INPUT        },
  81   { "_POSIX_MQ_OPEN_MAX",       CONSTANT,       _POSIX_MQ_OPEN_MAX      },
  82   { "_POSIX_MQ_PRIO_MAX",       CONSTANT,       _POSIX_MQ_PRIO_MAX      },
  83   { "_POSIX_NAME_MAX",          CONSTANT,       _POSIX_NAME_MAX         },
  84   { "_POSIX_NGROUPS_MAX",       CONSTANT,       _POSIX_NGROUPS_MAX      },
  85   { "_POSIX_OPEN_MAX",          CONSTANT,       _POSIX_OPEN_MAX         },
  86   { "_POSIX_PATH_MAX",          CONSTANT,       _POSIX_PATH_MAX         },
  87   { "_POSIX_PIPE_BUF",          CONSTANT,       _POSIX_PIPE_BUF         },
  88   { "_POSIX_SSIZE_MAX",         CONSTANT,       _POSIX_SSIZE_MAX        },
  89   { "_POSIX_STREAM_MAX",        CONSTANT,       _POSIX_STREAM_MAX       },
  90   { "_POSIX_TZNAME_MAX",        CONSTANT,       _POSIX_TZNAME_MAX       },
  91
  92   /* Symbolic Utility Limits */
  93   { "BC_BASE_MAX",              SYSCONF,        _SC_BC_BASE_MAX         },
  94   { "BC_DIM_MAX",               SYSCONF,        _SC_BC_DIM_MAX          },
  95   { "BC_SCALE_MAX",             SYSCONF,        _SC_BC_SCALE_MAX        },
  96   { "BC_STRING_MAX",            SYSCONF,        _SC_BC_STRING_MAX       },
  97   { "COLL_WEIGHTS_MAX",         SYSCONF,        _SC_COLL_WEIGHTS_MAX    },
  98   { "EXPR_NEST_MAX",            SYSCONF,        _SC_EXPR_NEST_MAX       },
  99   { "LINE_MAX",                 SYSCONF,        _SC_LINE_MAX            },
 100   { "RE_DUP_MAX",               SYSCONF,        _SC_RE_DUP_MAX          },
 101
 102   /* Optional Facility Configuration Values */
 103   { "_POSIX2_C_BIND",           SYSCONF,        _SC_2_C_BIND            },
 104   { "POSIX2_C_DEV",             SYSCONF,        _SC_2_C_DEV             },
 105   { "POSIX2_CHAR_TERM",         SYSCONF,        _SC_2_CHAR_TERM         },
 106   { "POSIX2_FORT_DEV",          SYSCONF,        _SC_2_FORT_DEV          },
 107   { "POSIX2_FORT_RUN",          SYSCONF,        _SC_2_FORT_RUN          },
 108   { "POSIX2_LOCALEDEF",         SYSCONF,        _SC_2_LOCALEDEF         },
 109   { "POSIX2_SW_DEV",            SYSCONF,        _SC_2_SW_DEV            },
 110   { "POSIX2_UPE",               SYSCONF,        _SC_2_UPE               },
 111
 112   /* POSIX.1 Configurable System Variables */
 113   { "AIO_LISTIO_MAX",           SYSCONF,        _SC_AIO_LISTIO_MAX      },
 114   { "AIO_MAX",                  SYSCONF,        _SC_AIO_MAX             },
 115   { "ARG_MAX",                  SYSCONF,        _SC_ARG_MAX             },
 116   { "CHILD_MAX",                SYSCONF,        _SC_CHILD_MAX           },
 117   { "CLK_TCK",                  SYSCONF,        _SC_CLK_TCK             },
 118   { "MQ_OPEN_MAX",              SYSCONF,        _SC_MQ_OPEN_MAX         },
 119   { "MQ_PRIO_MAX",              SYSCONF,        _SC_MQ_PRIO_MAX         },
 120   { "NGROUPS_MAX",              SYSCONF,        _SC_NGROUPS_MAX         },
 121   { "OPEN_MAX",                 SYSCONF,        _SC_OPEN_MAX            },
 122   { "STREAM_MAX",               SYSCONF,        _SC_STREAM_MAX          },
 123   { "TZNAME_MAX",               SYSCONF,        _SC_TZNAME_MAX          },
 124   { "_POSIX_JOB_CONTROL",       SYSCONF,        _SC_JOB_CONTROL         },
 125   { "_POSIX_SAVED_IDS",         SYSCONF,        _SC_SAVED_IDS           },
 126   { "_POSIX_VERSION",           SYSCONF,        _SC_VERSION             },
 127
 128   { "LINK_MAX",                 PATHCONF,       _PC_LINK_MAX            },
 129   { "MAX_CANON",                PATHCONF,       _PC_MAX_CANON           },
 130   { "MAX_INPUT",                PATHCONF,       _PC_MAX_INPUT           },
 131   { "NAME_MAX",                 PATHCONF,       _PC_NAME_MAX            },
 132   { "PATH_MAX",                 PATHCONF,       _PC_PATH_MAX            },
 133   { "PIPE_BUF",                 PATHCONF,       _PC_PIPE_BUF            },
 134   { "_POSIX_CHOWN_RESTRICTED",  PATHCONF,       _PC_CHOWN_RESTRICTED    },
 135   { "_POSIX_NO_TRUNC",          PATHCONF,       _PC_NO_TRUNC            },
 136   { "_POSIX_VDISABLE",          PATHCONF,       _PC_VDISABLE            },
 137
 138   /* POSIX.1b Configurable System Variables */
 139   { "PAGESIZE",                 SYSCONF,        _SC_PAGESIZE            },
 140   { "_POSIX_ASYNCHRONOUS_IO",   SYSCONF,        _SC_ASYNCHRONOUS_IO     },
 141   { "_POSIX_FSYNC",             SYSCONF,        _SC_FSYNC               },
 142   { "_POSIX_MAPPED_FILES",      SYSCONF,        _SC_MAPPED_FILES        },
 143   { "_POSIX_MEMLOCK",           SYSCONF,        _SC_MEMLOCK             },
 144   { "_POSIX_MEMLOCK_RANGE",     SYSCONF,        _SC_MEMLOCK_RANGE       },
 145   { "_POSIX_MEMORY_PROTECTION", SYSCONF,        _SC_MEMORY_PROTECTION   },
 146   { "_POSIX_MESSAGE_PASSING",   SYSCONF,        _SC_MESSAGE_PASSING     },
 147   { "_POSIX_MONOTONIC_CLOCK",   SYSCONF,        _SC_MONOTONIC_CLOCK     },
 148   { "_POSIX_PRIORITY_SCHEDULING", SYSCONF,      _SC_PRIORITY_SCHEDULING },
 149   { "_POSIX_SEMAPHORES",        SYSCONF,        _SC_SEMAPHORES          },
 150   { "_POSIX_SYNCHRONIZED_IO",   SYSCONF,        _SC_SYNCHRONIZED_IO     },
 151   { "_POSIX_TIMERS",            SYSCONF,        _SC_TIMERS              },
 152
 153   { "_POSIX_SYNC_IO",           PATHCONF,       _PC_SYNC_IO             },
 154
 155   /* POSIX.1c Configurable System Variables */
 156   { "LOGIN_NAME_MAX",           SYSCONF,        _SC_LOGIN_NAME_MAX      },
 157   { "_POSIX_THREADS",           SYSCONF,        _SC_THREADS             },
 158
 159   /* POSIX.1j Configurable System Variables */
 160   { "_POSIX_BARRIERS",          SYSCONF,        _SC_BARRIERS            },
 161   { "_POSIX_READER_WRITER_LOCKS", SYSCONF,      _SC_READER_WRITER_LOCKS },
 162   { "_POSIX_SPIN_LOCKS",        SYSCONF,        _SC_SPIN_LOCKS          },
 163
 164   /* XPG4.2 Configurable System Variables */
 165   { "IOV_MAX",                  SYSCONF,        _SC_IOV_MAX             },
 166   { "PAGE_SIZE",                SYSCONF,        _SC_PAGE_SIZE           },
 167   { "_XOPEN_SHM",               SYSCONF,        _SC_XOPEN_SHM           },
 168
 169   /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
 170   { "FILESIZEBITS",             PATHCONF,       _PC_FILESIZEBITS        },
 171
 172   /* POSIX.1-2001 XSI Option Group Configurable System Variables */
 173   { "ATEXIT_MAX",               SYSCONF,        _SC_ATEXIT_MAX          },
 174
 175   /* POSIX.1-2001 TSF Configurable System Variables */
 176   { "GETGR_R_SIZE_MAX",         SYSCONF,        _SC_GETGR_R_SIZE_MAX    },
 177   { "GETPW_R_SIZE_MAX",         SYSCONF,        _SC_GETPW_R_SIZE_MAX    },
 178
 179 #ifdef _NETBSD_SOURCE
 180   /* Commonly provided extensions */
 181   { "NPROCESSORS_CONF",         SYSCONF,        _SC_NPROCESSORS_CONF    },
 182   { "NPROCESSORS_ONLN",         SYSCONF,        _SC_NPROCESSORS_ONLN    },
 183 #endif  /* _NETBSD_SOURCE */
 184
 185   { NULL, CONSTANT, 0L }
 186 };
 187
 188 static int a_flag = 0;          /* list all variables */
 189
 190 int
 191 main(int argc, char **argv)
 192 {
 193         int ch;
 194         const struct conf_variable *cp;
 195         const char *varname, *pathname;
 196         int found;
 197
 198         setprogname(argv[0]);
 199         (void)setlocale(LC_ALL, "");
 200
 201         while ((ch = getopt(argc, argv, "a")) != -1) {
 202                 switch (ch) {
 203                 case 'a':
 204                         a_flag = 1;
 205                         break;
 206                 case '?':
 207                 default:
 208                         usage();
 209                 }
 210         }
 211         argc -= optind;
 212         argv += optind;
 213
 214         if (!a_flag) {
 215                 if (argc == 0)
 216                         usage();
 217                 varname = argv[0];
 218                 argc--;
 219                 argv++;
 220         } else
 221                 varname = NULL;
 222
 223         if (argc > 1)
 224                 usage();
 225         pathname = argv[0];     /* may be NULL */
 226
 227         found = 0;
 228         for (cp = conf_table; cp->name != NULL; cp++) {
 229                 if (a_flag || strcmp(varname, cp->name) == 0) {
 230                         /*LINTED weird expression*/
 231                         if ((cp->type == PATHCONF) == (pathname != NULL)) {
 232                                 printvar(cp, pathname);
 233                                 found = 1;
 234                         } else if (!a_flag)
 235                                 errx(EXIT_FAILURE,
 236                                     "%s: invalid variable type", cp->name);
 237                 }
 238         }
 239
 240         if (!a_flag && !found)
 241                 errx(EXIT_FAILURE, "%s: unknown variable", varname);
 242
 243         (void)fflush(stdout);
 244         return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS;
 245 }
 246
 247 static void
 248 print_longvar(const char *name, long value)
 249 {
 250         if (a_flag)
 251                 (void)printf("%s = %ld\n", name, value);
 252         else
 253                 (void)printf("%ld\n", value);
 254 }
 255
 256 static void
 257 print_strvar(const char *name, const char *sval)
 258 {
 259         if (a_flag)
 260                 (void)printf("%s = %s\n", name, sval);
 261         else
 262                 (void)printf("%s\n", sval);
 263 }
 264
 265 static void
 266 printvar(const struct conf_variable *cp, const char *pathname)
 267 {
 268         size_t slen;
 269         char *sval;
 270         long val;
 271
 272         switch (cp->type) {
 273         case CONSTANT:
 274                 print_longvar(cp->name, cp->value);
 275                 break;
 276
 277         case CONFSTR:
 278                 errno = 0;
 279                 slen = confstr((int)cp->value, NULL, 0);
 280                 if (slen == 0) {
 281                         if (errno != 0)
 282
 283 out:                            err(EXIT_FAILURE, "confstr(%ld)", cp->value);
 284                         else
 285                                 print_strvar(cp->name, "undefined");
 286                 }
 287
 288                 if ((sval = malloc(slen)) == NULL)
 289                         err(EXIT_FAILURE, "Can't allocate %zu bytes", slen);
 290
 291                 errno = 0;
 292                 if (confstr((int)cp->value, sval, slen) == 0) {
 293                         if (errno != 0)
 294                                 goto out;
 295                         else
 296                                 print_strvar(cp->name, "undefined");
 297                 } else
 298                         print_strvar(cp->name, sval);
 299
 300                 free(sval);
 301                 break;
 302
 303         case SYSCONF:
 304                 errno = 0;
 305                 if ((val = sysconf((int)cp->value)) == -1) {
 306                         if (errno != 0)
 307                                 err(EXIT_FAILURE, "sysconf(%ld)", cp->value);
 308                         print_strvar(cp->name, "undefined");
 309                 } else
 310                         print_longvar(cp->name, val);
 311                 break;
 312
 313         case PATHCONF:
 314                 errno = 0;
 315                 if ((val = pathconf(pathname, (int)cp->value)) == -1) {
 316                         if (errno != 0) {
 317                                 if (a_flag && errno == EINVAL) {
 318                                         /* Just skip invalid variables */
 319                                         return;
 320                                 }
 321                                 err(EXIT_FAILURE, "pathconf(%s, %ld)",
 322                                     pathname, cp->value);
 323                                 /* NOTREACHED */
 324                         }
 325
 326                         print_strvar(cp->name, "undefined");
 327                 } else
 328                         print_longvar(cp->name, val);
 329                 break;
 330         }
 331 }
 332
 333
 334 static void
 335 usage(void)
 336 {
 337         const char *p = getprogname();
 338         (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n"
 339             "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p);
 340         exit(EXIT_FAILURE);
 341 }