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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, 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     { "MAX_CANON", _PC_MAX_CANON, PATHCONF },
  38     { "MAX_INPUT", _PC_MAX_INPUT, PATHCONF },
  39     { "NAME_MAX", _PC_NAME_MAX, PATHCONF },
  40     { "PATH_MAX", _PC_PATH_MAX, PATHCONF },
  41     { "PIPE_BUF", _PC_PIPE_BUF, PATHCONF },
  42     { "SOCK_MAXBUF", _PC_SOCK_MAXBUF, PATHCONF },
  43     { "_POSIX_CHOWN_RESTRICTED", _PC_CHOWN_RESTRICTED, PATHCONF },
  44     { "_POSIX_NO_TRUNC", _PC_NO_TRUNC, PATHCONF },
  45     { "_POSIX_VDISABLE", _PC_VDISABLE, PATHCONF },
  46     { "_POSIX_SYNC_IO", _PC_SYNC_IO, PATHCONF },
  47     { "_POSIX_ASYNC_IO", _PC_ASYNC_IO, PATHCONF },
  48     { "_POSIX_PRIO_IO", _PC_PRIO_IO, PATHCONF },
  49
  50     { "ARG_MAX", _SC_ARG_MAX, SYSCONF },
  51     { "CHILD_MAX", _SC_CHILD_MAX, SYSCONF },
  52     { "CLK_TCK", _SC_CLK_TCK, SYSCONF },
  53     { "NGROUPS_MAX", _SC_NGROUPS_MAX, SYSCONF },
  54     { "OPEN_MAX", _SC_OPEN_MAX, SYSCONF },
  55     { "_POSIX_JOB_CONTROL", _SC_JOB_CONTROL, SYSCONF },
  56     { "_POSIX_SAVED_IDS", _SC_SAVED_IDS, SYSCONF },
  57     { "_POSIX_REALTIME_SIGNALS", _SC_REALTIME_SIGNALS, SYSCONF },
  58     { "_POSIX_PRIORITY_SCHEDULING", _SC_PRIORITY_SCHEDULING, SYSCONF },
  59     { "_POSIX_TIMERS", _SC_TIMERS, SYSCONF },
  60     { "_POSIX_ASYNCHRONOUS_IO", _SC_ASYNCHRONOUS_IO, SYSCONF },
  61     { "_POSIX_PRIORITIZED_IO", _SC_PRIORITIZED_IO, SYSCONF },
  62     { "_POSIX_SYNCHRONIZED_IO", _SC_SYNCHRONIZED_IO, SYSCONF },
  63     { "_POSIX_FSYNC", _SC_FSYNC, SYSCONF },
  64     { "_POSIX_MAPPED_FILES", _SC_MAPPED_FILES, SYSCONF },
  65     { "_POSIX_MEMLOCK", _SC_MEMLOCK, SYSCONF },
  66     { "_POSIX_MEMLOCK_RANGE", _SC_MEMLOCK_RANGE, SYSCONF },
  67     { "_POSIX_MEMORY_PROTECTION", _SC_MEMORY_PROTECTION, SYSCONF },
  68     { "_POSIX_MESSAGE_PASSING", _SC_MESSAGE_PASSING, SYSCONF },
  69     { "_POSIX_SEMAPHORES", _SC_SEMAPHORES, SYSCONF },
  70     { "_POSIX_SHARED_MEMORY_OBJECTS", _SC_SHARED_MEMORY_OBJECTS, SYSCONF },
  71     { "_POSIX_VERSION", _SC_VERSION, SYSCONF },
  72     { "_POSIX_PII", _SC_PII, SYSCONF },
  73     { "_POSIX_PII_XTI", _SC_PII_XTI, SYSCONF },
  74     { "_POSIX_PII_SOCKET", _SC_PII_SOCKET, SYSCONF },
  75     { "_POSIX_PII_INTERNET", _SC_PII_INTERNET, SYSCONF },
  76     { "_POSIX_PII_OSI", _SC_PII_OSI, SYSCONF },
  77     { "_POSIX_POLL", _SC_POLL, SYSCONF },
  78     { "_POSIX_SELECT", _SC_SELECT, SYSCONF },
  79     { "UIO_MAXIOV", _SC_UIO_MAXIOV, SYSCONF },
  80     { "_POSIX_PII_INTERNET_STREAM", _SC_PII_INTERNET_STREAM, SYSCONF },
  81     { "_POSIX_PII_INTERNET_DGRAM", _SC_PII_INTERNET_DGRAM, SYSCONF },
  82     { "_POSIX_PII_OSI_COTS", _SC_PII_OSI_COTS, SYSCONF },
  83     { "_POSIX_PII_OSI_CLTS", _SC_PII_OSI_CLTS, SYSCONF },
  84     { "_POSIX_PII_OSI_M", _SC_PII_OSI_M, SYSCONF },
  85     { "_T_IOV_MAX", _SC_T_IOV_MAX, SYSCONF },
  86     { "_POSIX_THREADS", _SC_THREADS, SYSCONF },
  87     { "_POSIX_THREAD_SAFE_FUNCTIONS", _SC_THREAD_SAFE_FUNCTIONS, SYSCONF },
  88     { "NSS_BUFLEN_GROUP", _SC_GETGR_R_SIZE_MAX, SYSCONF },
  89     { "NSS_BUFLEN_PASSWD", _SC_GETPW_R_SIZE_MAX, SYSCONF },
  90     { "LOGNAME_MAX", _SC_LOGIN_NAME_MAX, SYSCONF },
  91     { "TTY_NAME_MAX", _SC_TTY_NAME_MAX, SYSCONF },
  92     { "PTHREAD_DESTRUCTOR_ITERATIONS", _SC_THREAD_DESTRUCTOR_ITERATIONS, SYSCONF },
  93     { "PTHREAD_KEYS_MAX", _SC_THREAD_KEYS_MAX, SYSCONF },
  94     { "PTHREAD_STACK_MIN", _SC_THREAD_STACK_MIN, SYSCONF },
  95     { "PTHREAD_THREADS_MAX", _SC_THREAD_THREADS_MAX, SYSCONF },
  96     { "_POSIX_THREAD_ATTR_STACKADDR", _SC_THREAD_ATTR_STACKADDR, SYSCONF },
  97     { "_POSIX_THREAD_ATTR_STACKSIZE", _SC_THREAD_ATTR_STACKSIZE, SYSCONF },
  98     { "_POSIX_THREAD_PRIORITY_SCHEDULING", _SC_THREAD_PRIORITY_SCHEDULING, SYSCONF },
  99     { "_POSIX_THREAD_PRIO_INHERIT", _SC_THREAD_PRIO_INHERIT, SYSCONF },
 100     { "_POSIX_THREAD_PRIO_PROTECT", _SC_THREAD_PRIO_PROTECT, SYSCONF },
 101     { "_POSIX_THREAD_PROCESS_SHARED", _SC_THREAD_PROCESS_SHARED, SYSCONF },
 102     { "_NPROCESSORS_CONF", _SC_NPROCESSORS_CONF, SYSCONF },
 103     { "_NPROCESSORS_ONLN", _SC_NPROCESSORS_ONLN, SYSCONF },
 104     { "ATEXIT_MAX", _SC_ATEXIT_MAX, SYSCONF },
 105     { "PASS_MAX", _SC_PASS_MAX, SYSCONF },
 106     { "_PHYS_PAGES", _SC_PHYS_PAGES, SYSCONF },
 107     { "_AVPHYS_PAGES", _SC_AVPHYS_PAGES, SYSCONF },
 108     { "_XOPEN_VERSION", _SC_XOPEN_VERSION },
 109     /* POSIX.2  */
 110     { "BC_BASE_MAX", _SC_BC_BASE_MAX, SYSCONF },
 111     { "BC_DIM_MAX", _SC_BC_DIM_MAX, SYSCONF },
 112     { "BC_SCALE_MAX", _SC_BC_SCALE_MAX, SYSCONF },
 113     { "BC_STRING_MAX", _SC_BC_STRING_MAX, SYSCONF },
 114     { "COLL_WEIGHTS_MAX", _SC_COLL_WEIGHTS_MAX, SYSCONF },
 115     { "EQUIV_CLASS_MAX", _SC_EQUIV_CLASS_MAX, SYSCONF },
 116     { "EXPR_NEST_MAX", _SC_EXPR_NEST_MAX, SYSCONF },
 117     { "LINE_MAX", _SC_LINE_MAX, SYSCONF },
 118     { "RE_DUP_MAX", _SC_RE_DUP_MAX, SYSCONF },
 119     { "CHARCLASS_NAME_MAX", _SC_CHARCLASS_NAME_MAX },
 120     { "POSIX2_C_BIND", _SC_2_C_BIND, SYSCONF },
 121     { "POSIX2_C_DEV", _SC_2_C_DEV, SYSCONF },
 122     { "POSIX2_FORT_DEV", _SC_2_FORT_DEV, SYSCONF },
 123     { "POSIX2_FORT_RUN", _SC_2_FORT_RUN, SYSCONF },
 124     { "POSIX2_LOCALEDEF", _SC_2_LOCALEDEF, SYSCONF },
 125     { "POSIX2_SW_DEV", _SC_2_SW_DEV, SYSCONF },
 126
 127     { "PATH", _CS_PATH, CONFSTR },
 128
 129     { NULL, 0, SYSCONF }
 130   };
 131
 132 extern const char *__progname;
 133
 134
 135 static void
 136 usage (void)
 137 {
 138   fprintf (stderr, _("Usage: %s variable_name [pathname]\n"), __progname);
 139   exit (2);
 140 }
 141
 142 int
 143 main (int argc, char *argv[])
 144 {
 145   register const struct conf *c;
 146
 147   if (argc < 2 || argc > 3)
 148     usage ();
 149
 150   for (c = vars; c->name != NULL; ++c)
 151     if (!strcmp (c->name, argv[1]))
 152       {
 153         long int value;
 154         size_t clen;
 155         char *cvalue;
 156         switch (c->call)
 157           {
 158           case PATHCONF:
 159             if (argc < 3)
 160               usage ();
 161             value = pathconf (argv[2], c->call_name);
 162             if (value == -1)
 163               error (3, errno, "pathconf: %s", argv[2]);
 164
 165             printf ("%ld\n", value);
 166             exit (0);
 167
 168           case SYSCONF:
 169             if (argc > 2)
 170               usage ();
 171             value = sysconf (c->call_name);
 172             printf ("%ld\n", value);
 173             exit (0);
 174
 175           case CONFSTR:
 176             if (argc > 2)
 177               usage ();
 178             clen = confstr (c->call_name, (char *) NULL, 0);
 179             cvalue = (char *) malloc (clen);
 180             if (cvalue == NULL)
 181               error (3, 0, _("memory exhausted"));
 182
 183             if (confstr (c->call_name, cvalue, clen) != clen)
 184               error (3, errno, "confstr");
 185
 186             printf ("%.*s\n", (int) clen, cvalue);
 187             exit (0);
 188           }
 189       }
 190
 191   error (2, 0, _("Unrecognized variable `%s'"), argv[1]);
 192   /* NOTREACHED */
 193   return 2;
 194 }