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 <sys/utsname.h>
  52 #include "libbb.h"
  53
  54 typedef struct {
  55         struct utsname name;
  56         char processor[sizeof(((struct utsname*)NULL)->machine)];
  57         char platform[sizeof(((struct utsname*)NULL)->machine)];
  58         char os[sizeof("GNU/Linux")];
  59 } uname_info_t;
  60
  61 static const char options[] ALIGN1 = "snrvmpioa";
  62 static const unsigned short utsname_offset[] = {
  63         offsetof(uname_info_t, name.sysname), /* -s */
  64         offsetof(uname_info_t, name.nodename), /* -n */
  65         offsetof(uname_info_t, name.release), /* -r */
  66         offsetof(uname_info_t, name.version), /* -v */
  67         offsetof(uname_info_t, name.machine), /* -m */
  68         offsetof(uname_info_t, processor), /* -p */
  69         offsetof(uname_info_t, platform), /* -i */
  70         offsetof(uname_info_t, os), /* -o */
  71 };
  72
  73 int uname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  74 int uname_main(int argc UNUSED_PARAM, char **argv)
  75 {
  76         uname_info_t uname_info;
  77 #if defined(__sparc__) && defined(__linux__)
  78         char *fake_sparc = getenv("FAKE_SPARC");
  79 #endif
  80         const char *unknown_str = "unknown";
  81         const char *fmt;
  82         const unsigned short *delta;
  83         unsigned toprint;
  84
  85         toprint = getopt32(argv, options);
  86
  87         if (argv[optind]) { /* coreutils-6.9 compat */
  88                 bb_show_usage();
  89         }
  90
  91         if (toprint & (1 << 8)) { /* -a => all opts on */
  92                 toprint = (1 << 8) - 1;
  93                 unknown_str = ""; /* -a does not print unknown fields */
  94         }
  95
  96         if (toprint == 0) { /* no opts => -s (sysname) */
  97                 toprint = 1;
  98         }
  99
 100         uname(&uname_info.name); /* never fails */
 101
 102 #if defined(__sparc__) && defined(__linux__)
 103         if (fake_sparc && (fake_sparc[0] | 0x20) == 'y') {
 104                 strcpy(uname_info.name.machine, "sparc");
 105         }
 106 #endif
 107         strcpy(uname_info.processor, unknown_str);
 108         strcpy(uname_info.platform, unknown_str);
 109         strcpy(uname_info.os, "GNU/Linux");
 110 #if 0
 111         /* Fedora does something like this */
 112         strcpy(uname_info.processor, uname_info.name.machine);
 113         strcpy(uname_info.platform, uname_info.name.machine);
 114         if (uname_info.platform[0] == 'i'
 115          && uname_info.platform[1]
 116          && uname_info.platform[2] == '8'
 117          && uname_info.platform[3] == '6'
 118         ) {
 119                 uname_info.platform[1] = '3';
 120         }
 121 #endif
 122
 123         delta = utsname_offset;
 124         fmt = " %s" + 1;
 125         do {
 126                 if (toprint & 1) {
 127                         const char *p = (char *)(&uname_info) + *delta;
 128                         if (p[0]) {
 129                                 printf(fmt, p);
 130                                 fmt = " %s";
 131                         }
 132                 }
 133                 ++delta;
 134         } while (toprint >>= 1);
 135         bb_putchar('\n');
 136
 137         fflush_stdout_and_exit(EXIT_SUCCESS); /* coreutils-6.9 compat */
 138 }