src/uname.c

   1 /* uname -- print system information
   2    Copyright (C) 89, 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Option               Example
  19
  20    -s, --sysname        SunOS
  21    -n, --nodename       rocky8
  22    -r, --release        4.0
  23    -v, --version
  24    -m, --machine        sun
  25    -a, --all            SunOS rocky8 4.0  sun
  26
  27    The default behavior is equivalent to `-s'.
  28
  29    David MacKenzie <djm@gnu.ai.mit.edu> */
  30
  31 #include <config.h>
  32 #include <stdio.h>
  33 #include <sys/types.h>
  34 #include <sys/utsname.h>
  35 #include <getopt.h>
  36
  37 #include "system.h"
  38 #include "error.h"
  39
  40 static void print_element __P ((unsigned int mask, char *element));
  41 static void usage __P ((int status));
  42
  43 /* Values that are bitwise or'd into `toprint'. */
  44 /* Operating system name. */
  45 #define PRINT_SYSNAME 1
  46
  47 /* Node name on a communications network. */
  48 #define PRINT_NODENAME 2
  49
  50 /* Operating system release. */
  51 #define PRINT_RELEASE 4
  52
  53 /* Operating system version. */
  54 #define PRINT_VERSION 8
  55
  56 /* Machine hardware name. */
  57 #define PRINT_MACHINE 16
  58
  59 /* Mask indicating which elements of the name to print. */
  60 static unsigned char toprint;
  61
  62 /* The name this program was run with, for error messages. */
  63 char *program_name;
  64
  65 /* If nonzero, display usage information and exit.  */
  66 static int show_help;
  67
  68 /* If nonzero, print the version on standard output and exit.  */
  69 static int show_version;
  70
  71 static struct option const long_options[] =
  72 {
  73   {"help", no_argument, &show_help, 1},
  74   {"machine", no_argument, NULL, 'm'},
  75   {"nodename", no_argument, NULL, 'n'},
  76   {"release", no_argument, NULL, 'r'},
  77   {"sysname", no_argument, NULL, 's'},
  78   {"version", no_argument, &show_version, 1},
  79   {"all", no_argument, NULL, 'a'},
  80   {NULL, 0, NULL, 0}
  81 };
  82
  83 void
  84 main (int argc, char **argv)
  85 {
  86   struct utsname name;
  87   int c;
  88
  89   program_name = argv[0];
  90   setlocale (LC_ALL, "");
  91   bindtextdomain (PACKAGE, LOCALEDIR);
  92   textdomain (PACKAGE);
  93
  94   toprint = 0;
  95
  96   while ((c = getopt_long (argc, argv, "snrvma", long_options, (int *) 0))
  97          != EOF)
  98     {
  99       switch (c)
 100         {
 101         case 0:
 102           break;
 103
 104         case 's':
 105           toprint |= PRINT_SYSNAME;
 106           break;
 107
 108         case 'n':
 109           toprint |= PRINT_NODENAME;
 110           break;
 111
 112         case 'r':
 113           toprint |= PRINT_RELEASE;
 114           break;
 115
 116         case 'v':
 117           toprint |= PRINT_VERSION;
 118           break;
 119
 120         case 'm':
 121           toprint |= PRINT_MACHINE;
 122           break;
 123
 124         case 'a':
 125           toprint = PRINT_SYSNAME | PRINT_NODENAME | PRINT_RELEASE |
 126             PRINT_VERSION | PRINT_MACHINE;
 127           break;
 128
 129         default:
 130           usage (1);
 131         }
 132     }
 133
 134   if (show_version)
 135     {
 136       printf ("uname - %s\n", PACKAGE_VERSION);
 137       exit (0);
 138     }
 139
 140   if (show_help)
 141     usage (0);
 142
 143   if (optind != argc)
 144     usage (1);
 145
 146   if (toprint == 0)
 147     toprint = PRINT_SYSNAME;
 148
 149   if (uname (&name) == -1)
 150     error (1, errno, _("cannot get system name"));
 151
 152   print_element (PRINT_SYSNAME, name.sysname);
 153   print_element (PRINT_NODENAME, name.nodename);
 154   print_element (PRINT_RELEASE, name.release);
 155   print_element (PRINT_VERSION, name.version);
 156   print_element (PRINT_MACHINE, name.machine);
 157
 158   exit (0);
 159 }
 160
 161 /* If the name element set in MASK is selected for printing in `toprint',
 162    print ELEMENT; then print a space unless it is the last element to
 163    be printed, in which case print a newline. */
 164
 165 static void
 166 print_element (unsigned int mask, char *element)
 167 {
 168   if (toprint & mask)
 169     {
 170       toprint &= ~mask;
 171       printf ("%s%c", element, toprint ? ' ' : '\n');
 172     }
 173 }
 174
 175 static void
 176 usage (int status)
 177 {
 178   if (status != 0)
 179     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 180              program_name);
 181   else
 182     {
 183       printf (_("Usage: %s [OPTION]...\n"), program_name);
 184       printf (_("\
 185 Print certain system information.  With no OPTION, same as -s.\n\
 186 \n\
 187   -a, --all        print all information\n\
 188   -m, --machine    print the machine (hardware) type\n\
 189   -n, --nodename   print the machine's network node hostname\n\
 190   -r, --release    print the operating system release\n\
 191   -s, --sysname    print the operating system name\n\
 192   -v               print the operating system version\n\
 193       --help       display this help and exit\n\
 194       --version    output version information and exit\n"));
 195     }
 196   exit (status);
 197 }