coreutils/uname.c

   1 /* vi: set sw=4 ts=4: */
   2 /* uname -- print system information
   3  * Copyright (C) 1989-1999 Free Software Foundation, Inc.
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   6  */
   7 /* Option               Example
   8  * -s, --sysname        SunOS
   9  * -n, --nodename       rocky8
  10  * -r, --release        4.0
  11  * -v, --version
  12  * -m, --machine        sun
  13  * -a, --all            SunOS rocky8 4.0  sun
  14  *
  15  * The default behavior is equivalent to '-s'.
  16  *
  17  * David MacKenzie <djm@gnu.ai.mit.edu>
  18  *
  19  * GNU coreutils 6.10:
  20  * Option:                      struct   Example(s):
  21  *                              utsname
  22  *                              field:
  23  * -s, --kernel-name            sysname  Linux
  24  * -n, --nodename               nodename localhost.localdomain
  25  * -r, --kernel-release         release  2.6.29
  26  * -v, --kernel-version         version  #1 SMP Sun Jan 11 20:52:37 EST 2009
  27  * -m, --machine                machine  x86_64   i686
  28  * -p, --processor              (none)   x86_64   i686
  29  * -i, --hardware-platform      (none)   x86_64   i386
  30  *      NB: vanilla coreutils reports "unknown" -p and -i,
  31  *      x86_64 and i686/i386 shown above are Fedora's inventions.
  32  * -o, --operating-system       (none)   GNU/Linux
  33  * -a, --all: all of the above, in the order shown.
  34  *      If -p or -i is not known, don't show them
  35  */
  36 /* Busyboxed by Erik Andersen
  37  *
  38  * Before 2003: Glenn McGrath and Manuel Novoa III
  39  *  Further size reductions.
  40  * Mar 16, 2003: Manuel Novoa III (mjn3@codepoet.org)
  41  *  Now does proper error checking on i/o.  Plus some further space savings.
  42  * Jan 2009:
  43  *  Fix handling of -a to not print "unknown", add -o and -i support.
  44  */
  45 //config:config UNAME
  46 //config:       bool "uname"
  47 //config:       default y
  48 //config:       help
  49 //config:         uname is used to print system information.
  50 //config:
  51 //config:config UNAME_OSNAME
  52 //config:       string "Operating system name"
  53 //config:       default "GNU/Linux"
  54 //config:       depends on UNAME
  55 //config:       help
  56 //config:         Sets the operating system name reported by uname -o.  The
  57 //config:         default is "GNU/Linux".
  58
  59 //applet:IF_UNAME(APPLET(uname, BB_DIR_BIN, BB_SUID_DROP))
  60
  61 //kbuild:lib-$(CONFIG_UNAME) += uname.o
  62
  63 /* BB_AUDIT SUSv3 compliant */
  64 /* http://www.opengroup.org/onlinepubs/007904975/utilities/uname.html */
  65
  66 //usage:#define uname_trivial_usage
  67 //usage:       "[-amnrspvio]"
  68 //usage:#define uname_full_usage "\n\n"
  69 //usage:       "Print system information\n"
  70 //usage:     "\n        -a      Print all"
  71 //usage:     "\n        -m      The machine (hardware) type"
  72 //usage:     "\n        -n      Hostname"
  73 //usage:     "\n        -r      Kernel release"
  74 //usage:     "\n        -s      Kernel name (default)"
  75 //usage:     "\n        -p      Processor type"
  76 //usage:     "\n        -v      Kernel version"
  77 //usage:     "\n        -i      The hardware platform"
  78 //usage:     "\n        -o      OS name"
  79 //usage:
  80 //usage:#define uname_example_usage
  81 //usage:       "$ uname -a\n"
  82 //usage:       "Linux debian 2.4.23 #2 Tue Dec 23 17:09:10 MST 2003 i686 GNU/Linux\n"
  83
  84 #include "libbb.h"
  85 /* After libbb.h, since it needs sys/types.h on some systems */
  86 #include <sys/utsname.h>
  87
  88 typedef struct {
  89         struct utsname name;
  90         char processor[sizeof(((struct utsname*)NULL)->machine)];
  91         char platform[sizeof(((struct utsname*)NULL)->machine)];
  92         char os[sizeof(CONFIG_UNAME_OSNAME)];
  93 } uname_info_t;
  94
  95 static const char options[] ALIGN1 = "snrvmpioa";
  96 static const unsigned short utsname_offset[] = {
  97         offsetof(uname_info_t, name.sysname), /* -s */
  98         offsetof(uname_info_t, name.nodename), /* -n */
  99         offsetof(uname_info_t, name.release), /* -r */
 100         offsetof(uname_info_t, name.version), /* -v */
 101         offsetof(uname_info_t, name.machine), /* -m */
 102         offsetof(uname_info_t, processor), /* -p */
 103         offsetof(uname_info_t, platform), /* -i */
 104         offsetof(uname_info_t, os), /* -o */
 105 };
 106
 107 int uname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 108 int uname_main(int argc UNUSED_PARAM, char **argv)
 109 {
 110 #if ENABLE_LONG_OPTS
 111         static const char uname_longopts[] ALIGN1 =
 112                 /* name, has_arg, val */
 113                 "all\0"               No_argument       "a"
 114                 "kernel-name\0"       No_argument       "s"
 115                 "nodename\0"          No_argument       "n"
 116                 "kernel-release\0"    No_argument       "r"
 117                 "release\0"           No_argument       "r"
 118                 "kernel-version\0"    No_argument       "v"
 119                 "machine\0"           No_argument       "m"
 120                 "processor\0"         No_argument       "p"
 121                 "hardware-platform\0" No_argument       "i"
 122                 "operating-system\0"  No_argument       "o"
 123         ;
 124 #endif
 125         uname_info_t uname_info;
 126 #if defined(__sparc__) && defined(__linux__)
 127         char *fake_sparc = getenv("FAKE_SPARC");
 128 #endif
 129         const char *unknown_str = "unknown";
 130         const char *fmt;
 131         const unsigned short *delta;
 132         unsigned toprint;
 133
 134         IF_LONG_OPTS(applet_long_options = uname_longopts);
 135         toprint = getopt32(argv, options);
 136
 137         if (argv[optind]) { /* coreutils-6.9 compat */
 138                 bb_show_usage();
 139         }
 140
 141         if (toprint & (1 << 8)) { /* -a => all opts on */
 142                 toprint = (1 << 8) - 1;
 143                 unknown_str = ""; /* -a does not print unknown fields */
 144         }
 145
 146         if (toprint == 0) { /* no opts => -s (sysname) */
 147                 toprint = 1;
 148         }
 149
 150         uname(&uname_info.name); /* never fails */
 151
 152 #if defined(__sparc__) && defined(__linux__)
 153         if (fake_sparc && (fake_sparc[0] | 0x20) == 'y') {
 154                 strcpy(uname_info.name.machine, "sparc");
 155         }
 156 #endif
 157         strcpy(uname_info.processor, unknown_str);
 158         strcpy(uname_info.platform, unknown_str);
 159         strcpy(uname_info.os, CONFIG_UNAME_OSNAME);
 160 #if 0
 161         /* Fedora does something like this */
 162         strcpy(uname_info.processor, uname_info.name.machine);
 163         strcpy(uname_info.platform, uname_info.name.machine);
 164         if (uname_info.platform[0] == 'i'
 165          && uname_info.platform[1]
 166          && uname_info.platform[2] == '8'
 167          && uname_info.platform[3] == '6'
 168         ) {
 169                 uname_info.platform[1] = '3';
 170         }
 171 #endif
 172
 173         delta = utsname_offset;
 174         fmt = " %s" + 1;
 175         do {
 176                 if (toprint & 1) {
 177                         const char *p = (char *)(&uname_info) + *delta;
 178                         if (p[0]) {
 179                                 printf(fmt, p);
 180                                 fmt = " %s";
 181                         }
 182                 }
 183                 ++delta;
 184         } while (toprint >>= 1);
 185         bb_putchar('\n');
 186
 187         fflush_stdout_and_exit(EXIT_SUCCESS); /* coreutils-6.9 compat */
 188 }