util-linux/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 tarball for details.
   6  */
   7
   8 /* BB_AUDIT SUSv3 compliant */
   9 /* http://www.opengroup.org/onlinepubs/007904975/utilities/uname.html */
  10
  11 /* Option               Example
  12  * -s, --sysname        SunOS
  13  * -n, --nodename       rocky8
  14  * -r, --release        4.0
  15  * -v, --version
  16  * -m, --machine        sun
  17  * -a, --all            SunOS rocky8 4.0  sun
  18  *
  19  * The default behavior is equivalent to '-s'.
  20  *
  21  * David MacKenzie <djm@gnu.ai.mit.edu>
  22  *
  23  * GNU coreutils 6.10:
  24  * Option:                      struct   Example(s):
  25  *                              utsname
  26  *                              field:
  27  * -s, --kernel-name            sysname  Linux
  28  * -n, --nodename               nodename localhost.localdomain
  29  * -r, --kernel-release         release  2.6.29
  30  * -v, --kernel-version         version  #1 SMP Sun Jan 11 20:52:37 EST 2009
  31  * -m, --machine                machine  x86_64   i686
  32  * -p, --processor              (none)   x86_64   i686
  33  * -i, --hardware-platform      (none)   x86_64   i386
  34  *      NB: vanilla coreutils reports "unknown" -p and -i,
  35  *      x86_64 and i686/i386 shown above are Fedora's inventions.
  36  * -o, --operating-system       (none)   GNU/Linux
  37  * -a, --all: all of the above, in the order shown.
  38  *      If -p or -i is not known, don't show them
  39  */
  40
  41 /* Busyboxed by Erik Andersen
  42  *
  43  * Before 2003: Glenn McGrath and Manuel Novoa III
  44  *  Further size reductions.
  45  * Mar 16, 2003: Manuel Novoa III (mjn3@codepoet.org)
  46  *  Now does proper error checking on i/o.  Plus some further space savings.
  47  * Jan 2009:
  48  *  Fix handling of -a to not print "unknown", add -o and -i support.
  49  */
  50
  51 #include "libbb.h"
  52 /* After libbb.h, since it needs sys/types.h on some systems */
  53 #include <sys/utsname.h>
  54
  55 typedef struct {
  56         struct utsname name;
  57         char processor[sizeof(((struct utsname*)NULL)->machine)];
  58         char platform[sizeof(((struct utsname*)NULL)->machine)];
  59         char os[sizeof("GNU/Linux")];
  60 } uname_info_t;
  61
  62 static const char options[] ALIGN1 = "snrvmpioa";
  63 static const unsigned short utsname_offset[] = {
  64         offsetof(uname_info_t, name.sysname), /* -s */
  65         offsetof(uname_info_t, name.nodename), /* -n */
  66         offsetof(uname_info_t, name.release), /* -r */
  67         offsetof(uname_info_t, name.version), /* -v */
  68         offsetof(uname_info_t, name.machine), /* -m */
  69         offsetof(uname_info_t, processor), /* -p */
  70         offsetof(uname_info_t, platform), /* -i */
  71         offsetof(uname_info_t, os), /* -o */
  72 };
  73
  74 int uname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  75 int uname_main(int argc UNUSED_PARAM, char **argv)
  76 {
  77 #if ENABLE_LONG_OPTS
  78         static const char uname_longopts[] ALIGN1 =
  79                 /* name, has_arg, val */
  80                 "all\0"               No_argument       "a"
  81                 "kernel-name\0"       No_argument       "s"
  82                 "nodename\0"          No_argument       "n"
  83                 "kernel-release\0"    No_argument       "r"
  84                 "release\0"           No_argument       "r"
  85                 "kernel-version\0"    No_argument       "v"
  86                 "machine\0"           No_argument       "m"
  87                 "processor\0"         No_argument       "p"
  88                 "hardware-platform\0" No_argument       "i"
  89                 "operating-system\0"  No_argument       "o"
  90         ;
  91 #endif
  92         uname_info_t uname_info;
  93 #if defined(__sparc__) && defined(__linux__)
  94         char *fake_sparc = getenv("FAKE_SPARC");
  95 #endif
  96         const char *unknown_str = "unknown";
  97         const char *fmt;
  98         const unsigned short *delta;
  99         unsigned toprint;
 100
 101         IF_LONG_OPTS(applet_long_options = uname_longopts);
 102         toprint = getopt32(argv, options);
 103
 104         if (argv[optind]) { /* coreutils-6.9 compat */
 105                 bb_show_usage();
 106         }
 107
 108         if (toprint & (1 << 8)) { /* -a => all opts on */
 109                 toprint = (1 << 8) - 1;
 110                 unknown_str = ""; /* -a does not print unknown fields */
 111         }
 112
 113         if (toprint == 0) { /* no opts => -s (sysname) */
 114                 toprint = 1;
 115         }
 116
 117         uname(&uname_info.name); /* never fails */
 118
 119 #if defined(__sparc__) && defined(__linux__)
 120         if (fake_sparc && (fake_sparc[0] | 0x20) == 'y') {
 121                 strcpy(uname_info.name.machine, "sparc");
 122         }
 123 #endif
 124         strcpy(uname_info.processor, unknown_str);
 125         strcpy(uname_info.platform, unknown_str);
 126         strcpy(uname_info.os, "GNU/Linux");
 127 #if 0
 128         /* Fedora does something like this */
 129         strcpy(uname_info.processor, uname_info.name.machine);
 130         strcpy(uname_info.platform, uname_info.name.machine);
 131         if (uname_info.platform[0] == 'i'
 132          && uname_info.platform[1]
 133          && uname_info.platform[2] == '8'
 134          && uname_info.platform[3] == '6'
 135         ) {
 136                 uname_info.platform[1] = '3';
 137         }
 138 #endif
 139
 140         delta = utsname_offset;
 141         fmt = " %s" + 1;
 142         do {
 143                 if (toprint & 1) {
 144                         const char *p = (char *)(&uname_info) + *delta;
 145                         if (p[0]) {
 146                                 printf(fmt, p);
 147                                 fmt = " %s";
 148                         }
 149                 }
 150                 ++delta;
 151         } while (toprint >>= 1);
 152         bb_putchar('\n');
 153
 154         fflush_stdout_and_exit(EXIT_SUCCESS); /* coreutils-6.9 compat */
 155 }