posix/getconf.c

   1 /* Copyright (C) 1991, 1992, 1995, 1996 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <unistd.h>
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <libintl.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26
  27 struct conf
  28   {
  29     const char *name;
  30     const int call_name;
  31     const enum { SYSCONF, CONFSTR, PATHCONF } call;
  32   };
  33
  34 static struct conf vars[] =
  35   {
  36     { "LINK_MAX", _PC_LINK_MAX, PATHCONF },
  37     { "_POSIX_LINK_MAX", _PC_LINK_MAX, PATHCONF },
  38     { "MAX_CANON", _PC_MAX_CANON, PATHCONF },
  39     { "_POSIX_MAX_CANON", _PC_MAX_CANON, PATHCONF },
  40     { "MAX_INPUT", _PC_MAX_INPUT, PATHCONF },
  41     { "_POSIX_MAX_INPUT", _PC_MAX_INPUT, PATHCONF },
  42     { "NAME_MAX", _PC_NAME_MAX, PATHCONF },
  43     { "_POSIX_NAME_MAX", _PC_NAME_MAX, PATHCONF },
  44     { "PATH_MAX", _PC_PATH_MAX, PATHCONF },
  45     { "_POSIX_PATH_MAX", _PC_PATH_MAX, PATHCONF },
  46     { "PIPE_BUF", _PC_PIPE_BUF, PATHCONF },
  47     { "_POSIX_PIPE_BUF", _PC_PIPE_BUF, PATHCONF },
  48     { "SOCK_MAXBUF", _PC_SOCK_MAXBUF, PATHCONF },
  49     { "_POSIX_ASYNC_IO", _PC_ASYNC_IO, PATHCONF },
  50     { "_POSIX_CHOWN_RESTRICTED", _PC_CHOWN_RESTRICTED, PATHCONF },
  51     { "_POSIX_NO_TRUNC", _PC_NO_TRUNC, PATHCONF },
  52     { "_POSIX_PRIO_IO", _PC_PRIO_IO, PATHCONF },
  53     { "_POSIX_SYNC_IO", _PC_SYNC_IO, PATHCONF },
  54     { "_POSIX_VDISABLE", _PC_VDISABLE, PATHCONF },
  55
  56     { "ARG_MAX", _SC_ARG_MAX, SYSCONF },
  57     { "ATEXIT_MAX", _SC_ATEXIT_MAX, SYSCONF },
  58     { "CHAR_BIT", _SC_CHAR_BIT, SYSCONF },
  59     { "CHAR_MAX", _SC_CHAR_MAX, SYSCONF },
  60     { "CHAR_MIN", _SC_CHAR_MIN, SYSCONF },
  61     { "CHILD_MAX", _SC_CHILD_MAX, SYSCONF },
  62     { "CLK_TCK", _SC_CLK_TCK, SYSCONF },
  63     { "INT_MAX", _SC_INT_MAX, SYSCONF },
  64     { "INT_MIN", _SC_INT_MIN, SYSCONF },
  65     { "IOV_MAX", _SC_UIO_MAXIOV, SYSCONF },
  66     { "LOGNAME_MAX", _SC_LOGIN_NAME_MAX, SYSCONF },
  67     { "LONG_BIT", _SC_LONG_BIT, SYSCONF },
  68     { "MB_LEN_MAX", _SC_MB_LEN_MAX, SYSCONF },
  69     { "NGROUPS_MAX", _SC_NGROUPS_MAX, SYSCONF },
  70     { "NL_ARGMAX", _SC_NL_ARGMAX, SYSCONF },
  71     { "NL_LANGMAX", _SC_NL_LANGMAX, SYSCONF },
  72     { "NL_MSGMAX", _SC_NL_MSGMAX, SYSCONF },
  73     { "NL_NMAX", _SC_NL_NMAX, SYSCONF },
  74     { "NL_SETMAX", _SC_NL_SETMAX, SYSCONF },
  75     { "NL_TEXTMAX", _SC_NL_TEXTMAX, SYSCONF },
  76     { "NSS_BUFLEN_GROUP", _SC_GETGR_R_SIZE_MAX, SYSCONF },
  77     { "NSS_BUFLEN_PASSWD", _SC_GETPW_R_SIZE_MAX, SYSCONF },
  78     { "NZERO", _SC_NZERO, SYSCONF },
  79     { "OPEN_MAX", _SC_OPEN_MAX, SYSCONF },
  80     { "PAGESIZE", _SC_PAGESIZE, SYSCONF },
  81     { "PAGE_SIZE", _SC_PAGESIZE, SYSCONF },
  82     { "PASS_MAX", _SC_PASS_MAX, SYSCONF },
  83     { "PTHREAD_DESTRUCTOR_ITERATIONS", _SC_THREAD_DESTRUCTOR_ITERATIONS, SYSCONF },
  84     { "PTHREAD_KEYS_MAX", _SC_THREAD_KEYS_MAX, SYSCONF },
  85     { "PTHREAD_STACK_MIN", _SC_THREAD_STACK_MIN, SYSCONF },
  86     { "PTHREAD_THREADS_MAX", _SC_THREAD_THREADS_MAX, SYSCONF },
  87     { "SCHAR_MAX", _SC_SCHAR_MAX, SYSCONF },
  88     { "SCHAR_MIN", _SC_SCHAR_MIN, SYSCONF },
  89     { "SHRT_MAX", _SC_SHRT_MAX, SYSCONF },
  90     { "SHRT_MIN", _SC_SHRT_MIN, SYSCONF },
  91     { "SSIZE_MAX", _SC_SSIZE_MAX, SYSCONF },
  92     { "TTY_NAME_MAX", _SC_TTY_NAME_MAX, SYSCONF },
  93     { "TZNAME_MAX", _SC_TZNAME_MAX, SYSCONF },
  94     { "UCHAR_MAX", _SC_UCHAR_MAX, SYSCONF },
  95     { "UINT_MAX", _SC_UINT_MAX, SYSCONF },
  96     { "UIO_MAXIOV", _SC_UIO_MAXIOV, SYSCONF },
  97     { "ULONG_MAX", _SC_ULONG_MAX, SYSCONF },
  98     { "USHRT_MAX", _SC_USHRT_MAX, SYSCONF },
  99     { "WORD_BIT", _SC_WORD_BIT, SYSCONF },
 100     { "_AVPHYS_PAGES", _SC_AVPHYS_PAGES, SYSCONF },
 101     { "_NPROCESSORS_CONF", _SC_NPROCESSORS_CONF, SYSCONF },
 102     { "_NPROCESSORS_ONLN", _SC_NPROCESSORS_ONLN, SYSCONF },
 103     { "_PHYS_PAGES", _SC_PHYS_PAGES, SYSCONF },
 104     { "_POSIX_ARG_MAX", _SC_ARG_MAX, SYSCONF },
 105     { "_POSIX_ASYNCHRONOUS_IO", _SC_ASYNCHRONOUS_IO, SYSCONF },
 106     { "_POSIX_CHILD_MAX", _SC_CHILD_MAX, SYSCONF },
 107     { "_POSIX_FSYNC", _SC_FSYNC, SYSCONF },
 108     { "_POSIX_JOB_CONTROL", _SC_JOB_CONTROL, SYSCONF },
 109     { "_POSIX_MAPPED_FILES", _SC_MAPPED_FILES, SYSCONF },
 110     { "_POSIX_MEMLOCK", _SC_MEMLOCK, SYSCONF },
 111     { "_POSIX_MEMLOCK_RANGE", _SC_MEMLOCK_RANGE, SYSCONF },
 112     { "_POSIX_MEMORY_PROTECTION", _SC_MEMORY_PROTECTION, SYSCONF },
 113     { "_POSIX_MESSAGE_PASSING", _SC_MESSAGE_PASSING, SYSCONF },
 114     { "_POSIX_NGROUPS_MAX", _SC_NGROUPS_MAX, SYSCONF },
 115     { "_POSIX_OPEN_MAX", _SC_OPEN_MAX, SYSCONF },
 116     { "_POSIX_PII", _SC_PII, SYSCONF },
 117     { "_POSIX_PII_INTERNET", _SC_PII_INTERNET, SYSCONF },
 118     { "_POSIX_PII_INTERNET_DGRAM", _SC_PII_INTERNET_DGRAM, SYSCONF },
 119     { "_POSIX_PII_INTERNET_STREAM", _SC_PII_INTERNET_STREAM, SYSCONF },
 120     { "_POSIX_PII_OSI", _SC_PII_OSI, SYSCONF },
 121     { "_POSIX_PII_OSI_CLTS", _SC_PII_OSI_CLTS, SYSCONF },
 122     { "_POSIX_PII_OSI_COTS", _SC_PII_OSI_COTS, SYSCONF },
 123     { "_POSIX_PII_OSI_M", _SC_PII_OSI_M, SYSCONF },
 124     { "_POSIX_PII_SOCKET", _SC_PII_SOCKET, SYSCONF },
 125     { "_POSIX_PII_XTI", _SC_PII_XTI, SYSCONF },
 126     { "_POSIX_POLL", _SC_POLL, SYSCONF },
 127     { "_POSIX_PRIORITIZED_IO", _SC_PRIORITIZED_IO, SYSCONF },
 128     { "_POSIX_PRIORITY_SCHEDULING", _SC_PRIORITY_SCHEDULING, SYSCONF },
 129     { "_POSIX_REALTIME_SIGNALS", _SC_REALTIME_SIGNALS, SYSCONF },
 130     { "_POSIX_SAVED_IDS", _SC_SAVED_IDS, SYSCONF },
 131     { "_POSIX_SELECT", _SC_SELECT, SYSCONF },
 132     { "_POSIX_SEMAPHORES", _SC_SEMAPHORES, SYSCONF },
 133     { "_POSIX_SHARED_MEMORY_OBJECTS", _SC_SHARED_MEMORY_OBJECTS, SYSCONF },
 134     { "_POSIX_SSIZE_MAX", _SC_SSIZE_MAX, SYSCONF },
 135     { "_POSIX_STREAM_MAX", _SC_STREAM_MAX, SYSCONF },
 136     { "_POSIX_SYNCHRONIZED_IO", _SC_SYNCHRONIZED_IO, SYSCONF },
 137     { "_POSIX_THREADS", _SC_THREADS, SYSCONF },
 138     { "_POSIX_THREAD_ATTR_STACKADDR", _SC_THREAD_ATTR_STACKADDR, SYSCONF },
 139     { "_POSIX_THREAD_ATTR_STACKSIZE", _SC_THREAD_ATTR_STACKSIZE, SYSCONF },
 140     { "_POSIX_THREAD_PRIORITY_SCHEDULING", _SC_THREAD_PRIORITY_SCHEDULING, SYSCONF },
 141     { "_POSIX_THREAD_PRIO_INHERIT", _SC_THREAD_PRIO_INHERIT, SYSCONF },
 142     { "_POSIX_THREAD_PRIO_PROTECT", _SC_THREAD_PRIO_PROTECT, SYSCONF },
 143     { "_POSIX_THREAD_PROCESS_SHARED", _SC_THREAD_PROCESS_SHARED, SYSCONF },
 144     { "_POSIX_THREAD_SAFE_FUNCTIONS", _SC_THREAD_SAFE_FUNCTIONS, SYSCONF },
 145     { "_POSIX_TIMERS", _SC_TIMERS, SYSCONF },
 146     { "_POSIX_TZNAME_MAX", _SC_TZNAME_MAX, SYSCONF },
 147     { "_POSIX_VERSION", _SC_VERSION, SYSCONF },
 148     { "_T_IOV_MAX", _SC_T_IOV_MAX, SYSCONF },
 149     { "_XOPEN_CRYPT", _SC_XOPEN_CRYPT, SYSCONF },
 150     { "_XOPEN_ENH_I18N", _SC_XOPEN_ENH_I18N, SYSCONF },
 151     { "_XOPEN_SHM", _SC_XOPEN_SHM, SYSCONF },
 152     { "_XOPEN_UNIX", _SC_XOPEN_UNIX, SYSCONF },
 153     { "_XOPEN_VERSION", _SC_XOPEN_VERSION, SYSCONF },
 154     { "_XOPEN_XCU_VERSION", _SC_XOPEN_XCU_VERSION, SYSCONF },
 155     { "_XOPEN_XPG2", _SC_XOPEN_XPG2, SYSCONF },
 156     { "_XOPEN_XPG3", _SC_XOPEN_XPG3, SYSCONF },
 157     { "_XOPEN_XPG4", _SC_XOPEN_XPG4, SYSCONF },
 158     /* POSIX.2  */
 159     { "BC_BASE_MAX", _SC_BC_BASE_MAX, SYSCONF },
 160     { "BC_DIM_MAX", _SC_BC_DIM_MAX, SYSCONF },
 161     { "BC_SCALE_MAX", _SC_BC_SCALE_MAX, SYSCONF },
 162     { "BC_STRING_MAX", _SC_BC_STRING_MAX, SYSCONF },
 163     { "CHARCLASS_NAME_MAX", _SC_CHARCLASS_NAME_MAX },
 164     { "COLL_WEIGHTS_MAX", _SC_COLL_WEIGHTS_MAX, SYSCONF },
 165     { "EQUIV_CLASS_MAX", _SC_EQUIV_CLASS_MAX, SYSCONF },
 166     { "EXPR_NEST_MAX", _SC_EXPR_NEST_MAX, SYSCONF },
 167     { "LINE_MAX", _SC_LINE_MAX, SYSCONF },
 168     { "POSIX2_BC_BASE_MAX", _SC_BC_BASE_MAX, SYSCONF },
 169     { "POSIX2_BC_DIM_MAX", _SC_BC_DIM_MAX, SYSCONF },
 170     { "POSIX2_BC_SCALE_MAX", _SC_BC_SCALE_MAX, SYSCONF },
 171     { "POSIX2_BC_STRING_MAX", _SC_BC_STRING_MAX, SYSCONF },
 172     { "POSIX2_CHAR_TERM", _SC_2_CHAR_TERM, SYSCONF },
 173     { "POSIX2_COLL_WEIGHTS_MAX", _SC_COLL_WEIGHTS_MAX, SYSCONF },
 174     { "POSIX2_C_BIND", _SC_2_C_BIND, SYSCONF },
 175     { "POSIX2_C_DEV", _SC_2_C_DEV, SYSCONF },
 176     { "POSIX2_C_VERSION", _SC_2_C_VERSION, SYSCONF },
 177     { "POSIX2_EXPR_NEST_MAX", _SC_EXPR_NEST_MAX, SYSCONF },
 178     { "POSIX2_FORT_DEV", _SC_2_FORT_DEV, SYSCONF },
 179     { "POSIX2_FORT_RUN", _SC_2_FORT_RUN, SYSCONF },
 180     { "POSIX2_LINE_MAX", _SC_LINE_MAX, SYSCONF },
 181     { "POSIX2_LOCALEDEF", _SC_2_LOCALEDEF, SYSCONF },
 182     { "POSIX2_RE_DUP_MAX", _SC_RE_DUP_MAX, SYSCONF },
 183     { "POSIX2_SW_DEV", _SC_2_SW_DEV, SYSCONF },
 184     { "POSIX2_UPE", _SC_2_UPE, SYSCONF },
 185     { "POSIX2_VERSION", _SC_2_VERSION, SYSCONF },
 186     { "RE_DUP_MAX", _SC_RE_DUP_MAX, SYSCONF },
 187
 188     { "PATH", _CS_PATH, CONFSTR },
 189     { "CS_PATH", _CS_PATH, CONFSTR },
 190
 191     { NULL, 0, SYSCONF }
 192   };
 193
 194 extern const char *__progname;
 195
 196
 197 static void
 198 usage (void)
 199 {
 200   fprintf (stderr, _("Usage: %s variable_name [pathname]\n"), __progname);
 201   exit (2);
 202 }
 203
 204 int
 205 main (int argc, char *argv[])
 206 {
 207   register const struct conf *c;
 208
 209   if (argc < 2 || argc > 3)
 210     usage ();
 211
 212   for (c = vars; c->name != NULL; ++c)
 213     if (!strcmp (c->name, argv[1]))
 214       {
 215         long int value;
 216         size_t clen;
 217         char *cvalue;
 218         switch (c->call)
 219           {
 220           case PATHCONF:
 221             if (argc < 3)
 222               usage ();
 223             value = pathconf (argv[2], c->call_name);
 224             if (value == -1)
 225               error (3, errno, "pathconf: %s", argv[2]);
 226
 227             printf ("%ld\n", value);
 228             exit (0);
 229
 230           case SYSCONF:
 231             if (argc > 2)
 232               usage ();
 233             value = sysconf (c->call_name);
 234             if (value == -1l)
 235               if (c->call_name == _SC_UINT_MAX
 236                   || c->call_name == _SC_ULONG_MAX)
 237                 printf ("%lu\n", value);
 238               else
 239                 puts (_("undefined"));
 240             else
 241               printf ("%ld\n", value);
 242             exit (0);
 243
 244           case CONFSTR:
 245             if (argc > 2)
 246               usage ();
 247             clen = confstr (c->call_name, (char *) NULL, 0);
 248             cvalue = (char *) malloc (clen);
 249             if (cvalue == NULL)
 250               error (3, 0, _("memory exhausted"));
 251
 252             if (confstr (c->call_name, cvalue, clen) != clen)
 253               error (3, errno, "confstr");
 254
 255             printf ("%.*s\n", (int) clen, cvalue);
 256             exit (0);
 257           }
 258       }
 259
 260   error (2, 0, _("Unrecognized variable `%s'"), argv[1]);
 261   /* NOTREACHED */
 262   return 2;
 263 }