user/shutils/uname.c

   1 #include <unistd.h>
   2 #include <string.h>
   3 #include <sys/utsname.h>
   4
   5 static void print_element ();
   6
   7 /* Values that are bitwise or'd into toprint'. */
   8 /* Operating system name. */
   9 #define PRINT_SYSNAME 1
  10
  11 /* Node name on a communications network. */
  12 #define PRINT_NODENAME 2
  13
  14 /* Operating system release. */
  15 #define PRINT_RELEASE 4
  16
  17 /* Operating system version. */
  18 #define PRINT_VERSION 8
  19
  20 /* Machine hardware name. */
  21 #define PRINT_MACHINE 16
  22
  23 /* Mask indicating which elements of the name to print. */
  24 static unsigned char toprint;
  25
  26 int
  27 main (argc, argv)
  28         int argc;
  29         char **argv;
  30 {
  31         int     i;
  32         struct utsname name;
  33
  34         toprint = 0;
  35
  36         for(i=1;i<argc;i++)
  37         {
  38                 switch(argv[i][1])
  39                 {
  40                 case 's':
  41                         toprint |= PRINT_SYSNAME;
  42                         break;
  43
  44                 case 'n':
  45                         toprint |= PRINT_NODENAME;
  46                         break;
  47
  48                 case 'r':
  49                         toprint |= PRINT_RELEASE;
  50                         break;
  51
  52                 case 'v':
  53                         toprint |= PRINT_VERSION;
  54                         break;
  55
  56                 case 'm':
  57                         toprint |= PRINT_MACHINE;
  58                         break;
  59
  60                 case 'a':
  61                         toprint = PRINT_SYSNAME | PRINT_NODENAME |
  62                         PRINT_RELEASE | PRINT_VERSION | PRINT_MACHINE;
  63                         break;
  64
  65                 default:
  66                         break;
  67                 }
  68         }
  69         if (toprint == 0)
  70                 toprint = PRINT_SYSNAME;
  71         if (uname (&name) != -1)
  72         {
  73                 print_element (PRINT_SYSNAME, name.sysname);
  74                 print_element (PRINT_NODENAME, name.nodename);
  75                 print_element (PRINT_RELEASE, name.release);
  76                 print_element (PRINT_VERSION, name.version);
  77                 print_element (PRINT_MACHINE, name.machine);
  78         }
  79
  80         exit(0);
  81 }
  82
  83 static void
  84 print_element (mask, element)
  85         unsigned char mask;
  86         char *element;
  87 {
  88         if (toprint & mask)
  89         {
  90                 toprint &= ~mask;
  91                 write(STDOUT_FILENO,element,strlen(element));
  92                 write(STDOUT_FILENO,toprint ? " " : "\n",1);
  93         }
  94 }
  95