core/musl/files/getconf.c

   1 /*-
   2  * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by J.T. Conklin.
   7  *
   8  * Mostly rewritten to be used in Alpine Linux (with musl c-library)
   9  * by Timo Teräs.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <values.h>
  36 #include <limits.h>
  37 #include <locale.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <string.h>
  42
  43 struct conf_variable {
  44         const char *name;
  45         enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT, UCONSTANT, NUM_TYPES } type;
  46         long value;
  47 };
  48
  49 static const struct conf_variable conf_table[] = {
  50 { "PATH",                       CONFSTR,        _CS_PATH                },
  51
  52 /* Utility Limit Minimum Values */
  53 { "POSIX2_BC_BASE_MAX",         CONSTANT,       _POSIX2_BC_BASE_MAX     },
  54 { "POSIX2_BC_DIM_MAX",          CONSTANT,       _POSIX2_BC_DIM_MAX      },
  55 { "POSIX2_BC_SCALE_MAX",        CONSTANT,       _POSIX2_BC_SCALE_MAX    },
  56 { "POSIX2_BC_STRING_MAX",       CONSTANT,       _POSIX2_BC_STRING_MAX   },
  57 { "POSIX2_COLL_WEIGHTS_MAX",    CONSTANT,       _POSIX2_COLL_WEIGHTS_MAX },
  58 { "POSIX2_EXPR_NEST_MAX",       CONSTANT,       _POSIX2_EXPR_NEST_MAX   },
  59 { "POSIX2_LINE_MAX",            CONSTANT,       _POSIX2_LINE_MAX        },
  60 { "POSIX2_RE_DUP_MAX",          CONSTANT,       _POSIX2_RE_DUP_MAX      },
  61 { "POSIX2_VERSION",             CONSTANT,       _POSIX2_VERSION         },
  62
  63 /* POSIX.1 Minimum Values */
  64 { "_POSIX_AIO_LISTIO_MAX",      CONSTANT,       _POSIX_AIO_LISTIO_MAX   },
  65 { "_POSIX_AIO_MAX",             CONSTANT,       _POSIX_AIO_MAX          },
  66 { "_POSIX_ARG_MAX",             CONSTANT,       _POSIX_ARG_MAX          },
  67 { "_POSIX_CHILD_MAX",           CONSTANT,       _POSIX_CHILD_MAX        },
  68 { "_POSIX_LINK_MAX",            CONSTANT,       _POSIX_LINK_MAX         },
  69 { "_POSIX_MAX_CANON",           CONSTANT,       _POSIX_MAX_CANON        },
  70 { "_POSIX_MAX_INPUT",           CONSTANT,       _POSIX_MAX_INPUT        },
  71 { "_POSIX_MQ_OPEN_MAX",         CONSTANT,       _POSIX_MQ_OPEN_MAX      },
  72 { "_POSIX_MQ_PRIO_MAX",         CONSTANT,       _POSIX_MQ_PRIO_MAX      },
  73 { "_POSIX_NAME_MAX",            CONSTANT,       _POSIX_NAME_MAX         },
  74 { "_POSIX_NGROUPS_MAX",         CONSTANT,       _POSIX_NGROUPS_MAX      },
  75 { "_POSIX_OPEN_MAX",            CONSTANT,       _POSIX_OPEN_MAX         },
  76 { "_POSIX_PATH_MAX",            CONSTANT,       _POSIX_PATH_MAX         },
  77 { "_POSIX_PIPE_BUF",            CONSTANT,       _POSIX_PIPE_BUF         },
  78 { "_POSIX_SSIZE_MAX",           CONSTANT,       _POSIX_SSIZE_MAX        },
  79 { "_POSIX_STREAM_MAX",          CONSTANT,       _POSIX_STREAM_MAX       },
  80 { "_POSIX_TZNAME_MAX",          CONSTANT,       _POSIX_TZNAME_MAX       },
  81
  82 /* Symbolic Utility Limits */
  83 { "BC_BASE_MAX",                SYSCONF,        _SC_BC_BASE_MAX         },
  84 { "BC_DIM_MAX",                 SYSCONF,        _SC_BC_DIM_MAX          },
  85 { "BC_SCALE_MAX",               SYSCONF,        _SC_BC_SCALE_MAX        },
  86 { "BC_STRING_MAX",              SYSCONF,        _SC_BC_STRING_MAX       },
  87 { "COLL_WEIGHTS_MAX",           SYSCONF,        _SC_COLL_WEIGHTS_MAX    },
  88 { "EXPR_NEST_MAX",              SYSCONF,        _SC_EXPR_NEST_MAX       },
  89 { "LINE_MAX",                   SYSCONF,        _SC_LINE_MAX            },
  90 { "RE_DUP_MAX",                 SYSCONF,        _SC_RE_DUP_MAX          },
  91
  92 /* Optional Facility Configuration Values */
  93 { "_POSIX2_C_BIND",             SYSCONF,        _SC_2_C_BIND            },
  94 { "POSIX2_C_DEV",               SYSCONF,        _SC_2_C_DEV             },
  95 { "POSIX2_CHAR_TERM",           SYSCONF,        _SC_2_CHAR_TERM         },
  96 { "POSIX2_FORT_DEV",            SYSCONF,        _SC_2_FORT_DEV          },
  97 { "POSIX2_FORT_RUN",            SYSCONF,        _SC_2_FORT_RUN          },
  98 { "POSIX2_LOCALEDEF",           SYSCONF,        _SC_2_LOCALEDEF         },
  99 { "POSIX2_SW_DEV",              SYSCONF,        _SC_2_SW_DEV            },
 100 { "POSIX2_UPE",                 SYSCONF,        _SC_2_UPE               },
 101
 102 /* POSIX.1 Configurable System Variables */
 103 { "AIO_LISTIO_MAX",             SYSCONF,        _SC_AIO_LISTIO_MAX      },
 104 { "AIO_MAX",                    SYSCONF,        _SC_AIO_MAX             },
 105 { "ARG_MAX",                    SYSCONF,        _SC_ARG_MAX             },
 106 { "CHILD_MAX",                  SYSCONF,        _SC_CHILD_MAX           },
 107 { "CLK_TCK",                    SYSCONF,        _SC_CLK_TCK             },
 108 { "MQ_OPEN_MAX",                SYSCONF,        _SC_MQ_OPEN_MAX         },
 109 { "MQ_PRIO_MAX",                SYSCONF,        _SC_MQ_PRIO_MAX         },
 110 { "NGROUPS_MAX",                SYSCONF,        _SC_NGROUPS_MAX         },
 111 { "OPEN_MAX",                   SYSCONF,        _SC_OPEN_MAX            },
 112 { "STREAM_MAX",                 SYSCONF,        _SC_STREAM_MAX          },
 113 { "TZNAME_MAX",                 SYSCONF,        _SC_TZNAME_MAX          },
 114 { "_POSIX_JOB_CONTROL",         SYSCONF,        _SC_JOB_CONTROL         },
 115 { "_POSIX_SAVED_IDS",           SYSCONF,        _SC_SAVED_IDS           },
 116 { "_POSIX_VERSION",             SYSCONF,        _SC_VERSION             },
 117
 118 { "LINK_MAX",                   PATHCONF,       _PC_LINK_MAX            },
 119 { "MAX_CANON",                  PATHCONF,       _PC_MAX_CANON           },
 120 { "MAX_INPUT",                  PATHCONF,       _PC_MAX_INPUT           },
 121 { "NAME_MAX",                   PATHCONF,       _PC_NAME_MAX            },
 122 { "PATH_MAX",                   PATHCONF,       _PC_PATH_MAX            },
 123 { "PIPE_BUF",                   PATHCONF,       _PC_PIPE_BUF            },
 124 { "_POSIX_CHOWN_RESTRICTED",    PATHCONF,       _PC_CHOWN_RESTRICTED    },
 125 { "_POSIX_NO_TRUNC",            PATHCONF,       _PC_NO_TRUNC            },
 126 { "_POSIX_VDISABLE",            PATHCONF,       _PC_VDISABLE            },
 127
 128 /* POSIX.1b Configurable System Variables */
 129 { "PAGESIZE",                   SYSCONF,        _SC_PAGESIZE            },
 130 { "_POSIX_ASYNCHRONOUS_IO",     SYSCONF,        _SC_ASYNCHRONOUS_IO     },
 131 { "_POSIX_FSYNC",               SYSCONF,        _SC_FSYNC               },
 132 { "_POSIX_MAPPED_FILES",        SYSCONF,        _SC_MAPPED_FILES        },
 133 { "_POSIX_MEMLOCK",             SYSCONF,        _SC_MEMLOCK             },
 134 { "_POSIX_MEMLOCK_RANGE",       SYSCONF,        _SC_MEMLOCK_RANGE       },
 135 { "_POSIX_MEMORY_PROTECTION",   SYSCONF,        _SC_MEMORY_PROTECTION   },
 136 { "_POSIX_MESSAGE_PASSING",     SYSCONF,        _SC_MESSAGE_PASSING     },
 137 { "_POSIX_MONOTONIC_CLOCK",     SYSCONF,        _SC_MONOTONIC_CLOCK     },
 138 { "_POSIX_PRIORITY_SCHEDULING", SYSCONF,        _SC_PRIORITY_SCHEDULING },
 139 { "_POSIX_SEMAPHORES",          SYSCONF,        _SC_SEMAPHORES          },
 140 { "_POSIX_SHARED_MEMORY_OBJECTS", SYSCONF,      _SC_SHARED_MEMORY_OBJECTS },
 141 { "_POSIX_SYNCHRONIZED_IO",     SYSCONF,        _SC_SYNCHRONIZED_IO     },
 142 { "_POSIX_TIMERS",              SYSCONF,        _SC_TIMERS              },
 143
 144 { "_POSIX_SYNC_IO",             PATHCONF,       _PC_SYNC_IO             },
 145
 146 /* POSIX.1c Configurable System Variables */
 147 { "LOGIN_NAME_MAX",             SYSCONF,        _SC_LOGIN_NAME_MAX      },
 148 { "_POSIX_THREADS",             SYSCONF,        _SC_THREADS             },
 149
 150 /* POSIX.1j Configurable System Variables */
 151 { "_POSIX_BARRIERS",            SYSCONF,        _SC_BARRIERS            },
 152 { "_POSIX_READER_WRITER_LOCKS", SYSCONF,        _SC_READER_WRITER_LOCKS },
 153 { "_POSIX_SPIN_LOCKS",          SYSCONF,        _SC_SPIN_LOCKS          },
 154
 155 /* XPG4.2 Configurable System Variables */
 156 { "IOV_MAX",                    SYSCONF,        _SC_IOV_MAX             },
 157 { "PAGE_SIZE",                  SYSCONF,        _SC_PAGE_SIZE           },
 158 { "_XOPEN_SHM",                 SYSCONF,        _SC_XOPEN_SHM           },
 159
 160 /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
 161 { "FILESIZEBITS",               PATHCONF,       _PC_FILESIZEBITS        },
 162
 163 /* POSIX.1-2001 XSI Option Group Configurable System Variables */
 164 { "ATEXIT_MAX",                 SYSCONF,        _SC_ATEXIT_MAX          },
 165
 166 /* POSIX.1-2001 TSF Configurable System Variables */
 167 { "GETGR_R_SIZE_MAX",           SYSCONF,        _SC_GETGR_R_SIZE_MAX    },
 168 { "GETPW_R_SIZE_MAX",           SYSCONF,        _SC_GETPW_R_SIZE_MAX    },
 169
 170 /* Commonly provided extensions */
 171 { "_PHYS_PAGES",                SYSCONF,        _SC_PHYS_PAGES          },
 172 { "_AVPHYS_PAGES",              SYSCONF,        _SC_AVPHYS_PAGES        },
 173 { "_NPROCESSORS_CONF",          SYSCONF,        _SC_NPROCESSORS_CONF    },
 174 { "_NPROCESSORS_ONLN",          SYSCONF,        _SC_NPROCESSORS_ONLN    },
 175
 176 /* Data type related extensions */
 177 { "CHAR_BIT",                   CONSTANT,       CHAR_BIT                },
 178 { "CHAR_MAX",                   CONSTANT,       CHAR_MAX                },
 179 { "CHAR_MIN",                   CONSTANT,       CHAR_MIN                },
 180 { "INT_MAX",                    CONSTANT,       INT_MAX                 },
 181 { "INT_MIN",                    CONSTANT,       INT_MIN                 },
 182 { "LONG_BIT",                   CONSTANT,       LONG_BIT                },
 183 { "LONG_MAX",                   CONSTANT,       LONG_MAX                },
 184 { "LONG_MIN",                   CONSTANT,       LONG_MIN                },
 185 { "SCHAR_MAX",                  CONSTANT,       SCHAR_MAX               },
 186 { "SCHAR_MIN",                  CONSTANT,       SCHAR_MIN               },
 187 { "SHRT_MAX",                   CONSTANT,       SHRT_MAX                },
 188 { "SHRT_MIN",                   CONSTANT,       SHRT_MIN                },
 189 { "SSIZE_MAX",                  CONSTANT,       SSIZE_MAX               },
 190 { "UCHAR_MAX",                  UCONSTANT,      (long) UCHAR_MAX        },
 191 { "UINT_MAX",                   UCONSTANT,      (long) UINT_MAX         },
 192 { "ULONG_MAX",                  UCONSTANT,      (long) ULONG_MAX        },
 193 { "USHRT_MAX",                  UCONSTANT,      (long) USHRT_MAX        },
 194 { "WORD_BIT",                   CONSTANT,       WORD_BIT                },
 195
 196 { NULL, CONSTANT, 0L }
 197 };
 198
 199 static int all = 0;
 200
 201 static void usage(const char *p)
 202 {
 203         (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n"
 204             "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p);
 205         exit(EXIT_FAILURE);
 206 }
 207
 208 static void print_long(const char *name, long val)
 209 {
 210         if (all) printf("%s = %ld\n", name, val);
 211         else printf("%ld\n", val);
 212 }
 213
 214 static void print_ulong(const char *name, unsigned long val)
 215 {
 216         if (all) printf("%s = %lu\n", name, val);
 217         else printf("%lu\n", val);
 218 }
 219
 220 static void print_string(const char *name, const char *val)
 221 {
 222         if (all) printf("%s = %s\n", name, val);
 223         else printf("%s\n", val);
 224 }
 225
 226 static int print_constant(const struct conf_variable *cp, const char *pathname)
 227 {
 228         print_long(cp->name, cp->value);
 229         return 0;
 230 }
 231
 232 static int print_uconstant(const struct conf_variable *cp, const char *pathname)
 233 {
 234         print_ulong(cp->name, (unsigned long) cp->value);
 235         return 0;
 236 }
 237
 238 static int print_sysconf(const struct conf_variable *cp, const char *pathname)
 239 {
 240         long val;
 241
 242         errno = 0;
 243         if ((val = sysconf((int)cp->value)) == -1) {
 244                 if (errno != 0) err(EXIT_FAILURE, "sysconf(%ld)", cp->value);
 245                 return -1;
 246         }
 247         print_long(cp->name, val);
 248         return 0;
 249 }
 250
 251 static int print_confstr(const struct conf_variable *cp, const char *pathname)
 252 {
 253         size_t len;
 254         char *val;
 255
 256         errno = 0;
 257         if ((len = confstr((int)cp->value, NULL, 0)) == 0) goto error;
 258         if ((val = malloc(len)) == NULL) err(EXIT_FAILURE, "Can't allocate %zu bytes", len);
 259         errno = 0;
 260         if (confstr((int)cp->value, val, len) == 0) goto error;
 261         print_string(cp->name, val);
 262         free(val);
 263         return 0;
 264 error:
 265         if (errno != EINVAL) err(EXIT_FAILURE, "confstr(%ld)", cp->value);
 266         return -1;
 267 }
 268
 269 static int print_pathconf(const struct conf_variable *cp, const char *pathname)
 270 {
 271         long val;
 272
 273         errno = 0;
 274         if ((val = pathconf(pathname, (int)cp->value)) == -1) {
 275                 if (all && errno == EINVAL) return 0;
 276                 if (errno != 0) err(EXIT_FAILURE, "pathconf(%s, %ld)", pathname, cp->value);
 277                 return -1;
 278         }
 279         print_long(cp->name, val);
 280         return 0;
 281 }
 282
 283 typedef int (*handler_t)(const struct conf_variable *cp, const char *pathname);
 284 static const handler_t type_handlers[NUM_TYPES] = {
 285         [SYSCONF]       = print_sysconf,
 286         [CONFSTR]       = print_confstr,
 287         [PATHCONF]      = print_pathconf,
 288         [CONSTANT]      = print_constant,
 289         [UCONSTANT]     = print_uconstant,
 290 };
 291
 292 int main(int argc, char **argv)
 293 {
 294         const char *progname = argv[0];
 295         const struct conf_variable *cp;
 296         const char *varname, *pathname;
 297         int ch, found = 0;
 298
 299         (void)setlocale(LC_ALL, "");
 300         while ((ch = getopt(argc, argv, "a")) != -1) {
 301                 switch (ch) {
 302                 case 'a':
 303                         all = 1;
 304                         break;
 305                 case '?':
 306                 default:
 307                         usage(progname);
 308                 }
 309         }
 310         argc -= optind;
 311         argv += optind;
 312
 313         if (!all) {
 314                 if (argc == 0)
 315                         usage(progname);
 316                 varname = argv[0];
 317                 argc--;
 318                 argv++;
 319         } else
 320                 varname = NULL;
 321
 322         if (argc > 1)
 323                 usage(progname);
 324         pathname = argv[0];     /* may be NULL */
 325
 326         for (cp = conf_table; cp->name != NULL; cp++) {
 327                 if (!all && strcmp(varname, cp->name) != 0) continue;
 328                 if ((cp->type == PATHCONF) == (pathname != NULL)) {
 329                         if (type_handlers[cp->type](cp, pathname) < 0)
 330                                 print_string(cp->name, "undefined");
 331                         found = 1;
 332                 } else if (!all)
 333                         errx(EXIT_FAILURE, "%s: invalid variable type", cp->name);
 334         }
 335         if (!all && !found) errx(EXIT_FAILURE, "%s: unknown variable", varname);
 336         (void)fflush(stdout);
 337         return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS;
 338 }