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
  13    -s, --sysname        SunOS
  14    -n, --nodename       rocky8
  15    -r, --release        4.0
  16    -v, --version
  17    -m, --machine        sun
  18    -a, --all            SunOS rocky8 4.0  sun
  19
  20    The default behavior is equivalent to '-s'.
  21
  22    David MacKenzie <djm@gnu.ai.mit.edu> */
  23
  24 /* Busyboxed by Erik Andersen */
  25
  26 /* Further size reductions by Glenn McGrath and Manuel Novoa III. */
  27
  28 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  29  *
  30  * Now does proper error checking on i/o.  Plus some further space savings.
  31  */
  32
  33 #include <sys/utsname.h>
  34 #include "libbb.h"
  35
  36 typedef struct {
  37         struct utsname name;
  38         char processor[8];                      /* for "unknown" */
  39 } uname_info_t;
  40
  41 static const char options[] ALIGN1 = "snrvmpa";
  42 static const unsigned short utsname_offset[] = {
  43         offsetof(uname_info_t, name.sysname),
  44         offsetof(uname_info_t, name.nodename),
  45         offsetof(uname_info_t, name.release),
  46         offsetof(uname_info_t, name.version),
  47         offsetof(uname_info_t, name.machine),
  48         offsetof(uname_info_t, processor)
  49 };
  50
  51 int uname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  52 int uname_main(int argc UNUSED_PARAM, char **argv)
  53 {
  54         uname_info_t uname_info;
  55 #if defined(__sparc__) && defined(__linux__)
  56         char *fake_sparc = getenv("FAKE_SPARC");
  57 #endif
  58         const unsigned short *delta;
  59         char toprint;
  60
  61         toprint = getopt32(argv, options);
  62
  63         if (argv[optind]) { /* coreutils-6.9 compat */
  64                 bb_show_usage();
  65         }
  66
  67         if (toprint & (1 << 6)) { /* -a => all opts on */
  68                 toprint = 0x3f;
  69         }
  70
  71         if (toprint == 0) { /* no opts => -s (sysname) */
  72                 toprint = 1;
  73         }
  74
  75         uname(&uname_info.name); /* never fails */
  76
  77 #if defined(__sparc__) && defined(__linux__)
  78         if (fake_sparc && (fake_sparc[0] | 0x20) == 'y') {
  79                 strcpy(uname_info.name.machine, "sparc");
  80         }
  81 #endif
  82
  83         strcpy(uname_info.processor, "unknown");
  84
  85         delta = utsname_offset;
  86         do {
  87                 if (toprint & 1) {
  88                         /* printf would not be safe here */
  89                         fputs((char *)(&uname_info) + *delta, stdout);
  90                         if (toprint > 1) {
  91                                 bb_putchar(' ');
  92                         }
  93                 }
  94                 ++delta;
  95         } while (toprint >>= 1);
  96         bb_putchar('\n');
  97
  98         fflush_stdout_and_exit(EXIT_SUCCESS); /* coreutils-6.9 compat */
  99 }