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 <stdio.h>
  34 #include <stdlib.h>
  35 #include <stddef.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <sys/types.h>
  39 #include <sys/utsname.h>
  40 #include "libbb.h"
  41
  42 typedef struct {
  43         struct utsname name;
  44         char processor[8];                      /* for "unknown" */
  45 } uname_info_t;
  46
  47 static const char options[] = "snrvmpa";
  48 static const unsigned short int utsname_offset[] = {
  49         offsetof(uname_info_t,name.sysname),
  50         offsetof(uname_info_t,name.nodename),
  51         offsetof(uname_info_t,name.release),
  52         offsetof(uname_info_t,name.version),
  53         offsetof(uname_info_t,name.machine),
  54         offsetof(uname_info_t,processor)
  55 };
  56
  57 int uname_main(int argc, char **argv);
  58 int uname_main(int argc, char **argv)
  59 {
  60         uname_info_t uname_info;
  61 #if defined(__sparc__) && defined(__linux__)
  62         char *fake_sparc = getenv("FAKE_SPARC");
  63 #endif
  64         const unsigned short int *delta;
  65         char toprint;
  66
  67         toprint = getopt32(argc, argv, options);
  68
  69         if (argc != optind) {
  70                 bb_show_usage();
  71         }
  72
  73         if (toprint & (1 << 6)) {
  74                 toprint = 0x3f;
  75         }
  76
  77         if (toprint == 0) {
  78                 toprint = 1;                    /* sysname */
  79         }
  80
  81         if (uname(&uname_info.name) == -1) {
  82                 bb_error_msg_and_die("cannot get system name");
  83         }
  84
  85 #if defined(__sparc__) && defined(__linux__)
  86         if ((fake_sparc != NULL)
  87                 && ((fake_sparc[0] == 'y')
  88                         || (fake_sparc[0] == 'Y'))) {
  89                 strcpy(uname_info.name.machine, "sparc");
  90         }
  91 #endif
  92
  93         strcpy(uname_info.processor, "unknown");
  94
  95         delta = utsname_offset;
  96         do {
  97                 if (toprint & 1) {
  98                         printf(((char *)(&uname_info)) + *delta);
  99                         if (toprint > 1) {
 100                                 putchar(' ');
 101                         }
 102                 }
 103                 ++delta;
 104         } while (toprint >>= 1);
 105         putchar('\n');
 106
 107         fflush_stdout_and_exit(EXIT_SUCCESS);
 108 }