src/uname.c

   1 /* uname -- print system information
   2
   3    Copyright (C) 1989-2024 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <sys/utsname.h>
  24 #include <getopt.h>
  25
  26 #if HAVE_SYSINFO && HAVE_SYS_SYSTEMINFO_H
  27 # include <sys/systeminfo.h>
  28 #endif
  29
  30 #if HAVE_SYS_SYSCTL_H && ! defined __GLIBC__ && ! defined __APPLE__
  31 # if HAVE_SYS_PARAM_H
  32 #  include <sys/param.h> /* needed for OpenBSD 3.0 */
  33 # endif
  34 # include <sys/sysctl.h>
  35 # ifdef HW_MODEL
  36 #  ifdef HW_MACHINE_ARCH
  37 /* E.g., FreeBSD 4.5, NetBSD 1.5.2 */
  38 #   define UNAME_HARDWARE_PLATFORM HW_MODEL
  39 #   define UNAME_PROCESSOR HW_MACHINE_ARCH
  40 #  else
  41 /* E.g., OpenBSD 3.0 */
  42 #   define UNAME_PROCESSOR HW_MODEL
  43 #  endif
  44 # endif
  45 #endif
  46
  47 #include "system.h"
  48 #include "quote.h"
  49 #include "uname.h"
  50
  51 /* The official name of this program (e.g., no 'g' prefix).  */
  52 #define PROGRAM_NAME (uname_mode == UNAME_UNAME ? "uname" : "arch")
  53
  54 #define AUTHORS proper_name ("David MacKenzie")
  55 #define ARCH_AUTHORS "David MacKenzie", "Karel Zak"
  56
  57 /* Values that are bitwise or'd into 'toprint'. */
  58 /* Kernel name. */
  59 #define PRINT_KERNEL_NAME 1
  60
  61 /* Node name on a communications network. */
  62 #define PRINT_NODENAME 2
  63
  64 /* Kernel release. */
  65 #define PRINT_KERNEL_RELEASE 4
  66
  67 /* Kernel version. */
  68 #define PRINT_KERNEL_VERSION 8
  69
  70 /* Machine hardware name. */
  71 #define PRINT_MACHINE 16
  72
  73 /* Processor type. */
  74 #define PRINT_PROCESSOR 32
  75
  76 /* Hardware platform.  */
  77 #define PRINT_HARDWARE_PLATFORM 64
  78
  79 /* Operating system.  */
  80 #define PRINT_OPERATING_SYSTEM 128
  81
  82 static struct option const uname_long_options[] =
  83 {
  84   {"all", no_argument, nullptr, 'a'},
  85   {"kernel-name", no_argument, nullptr, 's'},
  86   {"sysname", no_argument, nullptr, 's'},       /* Obsolescent.  */
  87   {"nodename", no_argument, nullptr, 'n'},
  88   {"kernel-release", no_argument, nullptr, 'r'},
  89   {"release", no_argument, nullptr, 'r'},  /* Obsolescent.  */
  90   {"kernel-version", no_argument, nullptr, 'v'},
  91   {"machine", no_argument, nullptr, 'm'},
  92   {"processor", no_argument, nullptr, 'p'},
  93   {"hardware-platform", no_argument, nullptr, 'i'},
  94   {"operating-system", no_argument, nullptr, 'o'},
  95   {GETOPT_HELP_OPTION_DECL},
  96   {GETOPT_VERSION_OPTION_DECL},
  97   {nullptr, 0, nullptr, 0}
  98 };
  99
 100 static struct option const arch_long_options[] =
 101 {
 102   {GETOPT_HELP_OPTION_DECL},
 103   {GETOPT_VERSION_OPTION_DECL},
 104   {nullptr, 0, nullptr, 0}
 105 };
 106
 107 void
 108 usage (int status)
 109 {
 110   if (status != EXIT_SUCCESS)
 111     emit_try_help ();
 112   else
 113     {
 114       printf (_("Usage: %s [OPTION]...\n"), program_name);
 115
 116       if (uname_mode == UNAME_UNAME)
 117         {
 118           fputs (_("\
 119 Print certain system information.  With no OPTION, same as -s.\n\
 120 \n\
 121   -a, --all                print all information, in the following order,\n\
 122                              except omit -p and -i if unknown:\n\
 123   -s, --kernel-name        print the kernel name\n\
 124   -n, --nodename           print the network node hostname\n\
 125   -r, --kernel-release     print the kernel release\n\
 126 "), stdout);
 127           fputs (_("\
 128   -v, --kernel-version     print the kernel version\n\
 129   -m, --machine            print the machine hardware name\n\
 130   -p, --processor          print the processor type (non-portable)\n\
 131   -i, --hardware-platform  print the hardware platform (non-portable)\n\
 132   -o, --operating-system   print the operating system\n\
 133 "), stdout);
 134         }
 135       else
 136         {
 137           fputs (_("\
 138 Print machine architecture.\n\
 139 \n\
 140 "), stdout);
 141         }
 142
 143       fputs (HELP_OPTION_DESCRIPTION, stdout);
 144       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 145       emit_ancillary_info (PROGRAM_NAME);
 146     }
 147   exit (status);
 148 }
 149
 150 /* Print ELEMENT, preceded by a space if something has already been
 151    printed.  */
 152
 153 static void
 154 print_element (char const *element)
 155 {
 156   static bool printed;
 157   if (printed)
 158     putchar (' ');
 159   printed = true;
 160   fputs (element, stdout);
 161 }
 162
 163 /* Print ELEMENT, preceded by a space if something has already been
 164    printed.  But if the environment variable ENVVAR is set, print its
 165    value instead of ELEMENT.  */
 166
 167 static void
 168 print_element_env (char const *element, MAYBE_UNUSED char const *envvar)
 169 {
 170 #ifdef __APPLE__
 171   if (envvar)
 172     {
 173       char const *val = getenv (envvar);
 174       if (val)
 175         element = val;
 176     }
 177 #endif
 178   print_element (element);
 179 }
 180
 181
 182 /* Set all the option flags according to the switches specified.
 183    Return the mask indicating which elements to print.  */
 184
 185 static int
 186 decode_switches (int argc, char **argv)
 187 {
 188   int c;
 189   unsigned int toprint = 0;
 190
 191   if (uname_mode == UNAME_ARCH)
 192     {
 193       while ((c = getopt_long (argc, argv, "",
 194                                arch_long_options, nullptr))
 195              != -1)
 196         {
 197           switch (c)
 198             {
 199             case_GETOPT_HELP_CHAR;
 200
 201             case_GETOPT_VERSION_CHAR (PROGRAM_NAME, ARCH_AUTHORS);
 202
 203             default:
 204               usage (EXIT_FAILURE);
 205             }
 206         }
 207       toprint = PRINT_MACHINE;
 208     }
 209   else
 210     {
 211       while ((c = getopt_long (argc, argv, "asnrvmpio",
 212                                uname_long_options, nullptr))
 213              != -1)
 214         {
 215           switch (c)
 216             {
 217             case 'a':
 218               toprint = UINT_MAX;
 219               break;
 220
 221             case 's':
 222               toprint |= PRINT_KERNEL_NAME;
 223               break;
 224
 225             case 'n':
 226               toprint |= PRINT_NODENAME;
 227               break;
 228
 229             case 'r':
 230               toprint |= PRINT_KERNEL_RELEASE;
 231               break;
 232
 233             case 'v':
 234               toprint |= PRINT_KERNEL_VERSION;
 235               break;
 236
 237             case 'm':
 238               toprint |= PRINT_MACHINE;
 239               break;
 240
 241             case 'p':
 242               toprint |= PRINT_PROCESSOR;
 243               break;
 244
 245             case 'i':
 246               toprint |= PRINT_HARDWARE_PLATFORM;
 247               break;
 248
 249             case 'o':
 250               toprint |= PRINT_OPERATING_SYSTEM;
 251               break;
 252
 253             case_GETOPT_HELP_CHAR;
 254
 255             case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 256
 257             default:
 258               usage (EXIT_FAILURE);
 259             }
 260         }
 261     }
 262
 263   if (argc != optind)
 264     {
 265       error (0, 0, _("extra operand %s"), quote (argv[optind]));
 266       usage (EXIT_FAILURE);
 267     }
 268
 269   return toprint;
 270 }
 271
 272 int
 273 main (int argc, char **argv)
 274 {
 275   static char const unknown[] = "unknown";
 276
 277   /* Mask indicating which elements to print. */
 278   unsigned int toprint = 0;
 279
 280   initialize_main (&argc, &argv);
 281   set_program_name (argv[0]);
 282   setlocale (LC_ALL, "");
 283   bindtextdomain (PACKAGE, LOCALEDIR);
 284   textdomain (PACKAGE);
 285
 286   atexit (close_stdout);
 287
 288   toprint = decode_switches (argc, argv);
 289
 290   if (toprint == 0)
 291     toprint = PRINT_KERNEL_NAME;
 292
 293   if (toprint
 294        & (PRINT_KERNEL_NAME | PRINT_NODENAME | PRINT_KERNEL_RELEASE
 295           | PRINT_KERNEL_VERSION | PRINT_MACHINE))
 296     {
 297       struct utsname name;
 298
 299       if (uname (&name) == -1)
 300         error (EXIT_FAILURE, errno, _("cannot get system name"));
 301
 302       if (toprint & PRINT_KERNEL_NAME)
 303         print_element_env (name.sysname, "UNAME_SYSNAME");
 304       if (toprint & PRINT_NODENAME)
 305         print_element_env (name.nodename, "UNAME_NODENAME");
 306       if (toprint & PRINT_KERNEL_RELEASE)
 307         print_element_env (name.release, "UNAME_RELEASE");
 308       if (toprint & PRINT_KERNEL_VERSION)
 309         print_element_env (name.version, "UNAME_VERSION");
 310       if (toprint & PRINT_MACHINE)
 311         print_element_env (name.machine, "UNAME_MACHINE");
 312     }
 313
 314   if (toprint & PRINT_PROCESSOR)
 315     {
 316       char const *element = unknown;
 317 #ifdef __APPLE__
 318 # if defined __arm__ || defined __arm64__
 319       element = "arm";
 320 # elif defined __i386__ || defined __x86_64__
 321       element = "i386";
 322 # elif defined __ppc__ || defined __ppc64__
 323       element = "powerpc";
 324 # endif
 325 #endif
 326 #if HAVE_SYSINFO && defined SI_ARCHITECTURE
 327       if (element == unknown)
 328         {
 329           static char processor[257];
 330           if (0 <= sysinfo (SI_ARCHITECTURE, processor, sizeof processor))
 331             element = processor;
 332         }
 333 #endif
 334 #ifdef UNAME_PROCESSOR
 335       if (element == unknown)
 336         {
 337           static char processor[257];
 338           size_t s = sizeof processor;
 339           static int mib[] = { CTL_HW, UNAME_PROCESSOR };
 340           if (sysctl (mib, 2, processor, &s, 0, 0) >= 0)
 341             element = processor;
 342         }
 343 #endif
 344       if (! (toprint == UINT_MAX && element == unknown))
 345         print_element (element);
 346     }
 347
 348   if (toprint & PRINT_HARDWARE_PLATFORM)
 349     {
 350       char const *element = unknown;
 351 #if HAVE_SYSINFO && defined SI_PLATFORM
 352       {
 353         static char hardware_platform[257];
 354         if (0 <= sysinfo (SI_PLATFORM,
 355                           hardware_platform, sizeof hardware_platform))
 356           element = hardware_platform;
 357       }
 358 #endif
 359 #ifdef UNAME_HARDWARE_PLATFORM
 360       if (element == unknown)
 361         {
 362           static char hardware_platform[257];
 363           size_t s = sizeof hardware_platform;
 364           static int mib[] = { CTL_HW, UNAME_HARDWARE_PLATFORM };
 365           if (sysctl (mib, 2, hardware_platform, &s, 0, 0) >= 0)
 366             element = hardware_platform;
 367         }
 368 #endif
 369       if (! (toprint == UINT_MAX && element == unknown))
 370         print_element (element);
 371     }
 372
 373   if (toprint & PRINT_OPERATING_SYSTEM)
 374     print_element (HOST_OPERATING_SYSTEM);
 375
 376   putchar ('\n');
 377
 378   return EXIT_SUCCESS;
 379 }