LXR toybox/toys/posix/uname.c

   1/* uname.c - return system name
   2 *
   3 * Copyright 2008 Rob Landley <rob@landley.net>
   4 *
   5 * See http://opengroup.org/onlinepubs/9699919799/utilities/uname.html
   6
   7USE_UNAME(NEWTOY(uname, "oamvrns[+os]", TOYFLAG_BIN))
   8
   9config UNAME
  10  bool "uname"
  11  default y
  12  help
  13    usage: uname [-asnrvm]
  14
  15    Print system information.
  16
  17    -s  System name
  18    -n  Network (domain) name
  19    -r  Kernel Release number
  20    -v  Kernel Version 
  21    -m  Machine (hardware) name
  22    -a  All of the above
  23*/
  24
  25#define FOR_uname
  26#include "toys.h"
  27
  28// If a 32 bit x86 build environment working in a chroot under an x86-64
  29// kernel returns x86_64 for -m it confuses ./configure.  Special case it.
  30
  31#if defined(__i686__)
  32#define GROSS "i686"
  33#elif defined(__i586__)
  34#define GROSS "i586"
  35#elif defined(__i486__)
  36#define GROSS "i486"
  37#elif defined(__i386__)
  38#define GROSS "i386"
  39#endif
  40
  41void uname_main(void)
  42{
  43  int i, flags = toys.optflags, needspace=0;
  44  struct utsname u;
  45
  46  uname(&u);
  47
  48  if (!flags) flags = FLAG_s;
  49  for (i=0; i<5; i++) {
  50    char *c = ((char *) &u)+(sizeof(u.sysname)*i);
  51
  52    if (flags & ((1<<i)|FLAG_a)) {
  53      int len = strlen(c);
  54
  55      // This problem originates in autoconf, so of course the solution
  56      // is horribly ugly.
  57#ifdef GROSS
  58      if (i==4 && !strcmp(c,"x86_64")) {
  59        printf(GROSS);
  60        continue;
  61      }
  62#endif
  63
  64      if (needspace++) {
  65        // We can't decrement on the first entry, because
  66        // needspace would be 0
  67        *(--c)=' ';
  68        len++;
  69      }
  70      xwrite(1, c, len);
  71    }
  72  }
  73  putchar('\n');
  74}
  75