commands/uname/uname.c

   1 /*  uname - print system name                   Author: Earl Chew */
   2
   3 /* Print the following system information as returned by the uname()
   4  * function:
   5  *
   6  *      system name             Minix
   7  *      node name               waddles
   8  *      release name            1.5
   9  *      version                 10
  10  *      machine name            i86
  11  *      arch                    i86     (Minix specific)
  12  */
  13
  14 #include <sys/types.h>
  15 #include <sys/utsname.h>
  16 #include <stdarg.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <unistd.h>
  20
  21 /* Define the uname components. */
  22 #define ALL      ((unsigned) 0x1F)
  23 #define SYSNAME  ((unsigned) 0x01)
  24 #define NODENAME ((unsigned) 0x02)
  25 #define RELEASE  ((unsigned) 0x04)
  26 #define U_MACHINE  ((unsigned) 0x10)
  27 #define ARCH     ((unsigned) 0x20)
  28
  29 int main(int argc, char **argv );
  30 void print(int fd, ... );
  31 void usage(void );
  32
  33 #ifdef __STDC__
  34 void print(int fd, ...)
  35 #else
  36 void print(fd)
  37 int fd;
  38 #endif
  39 {
  40 /* Print a sequence of strings onto the named channel. */
  41   va_list argp;
  42   char *p;
  43
  44   va_start(argp, fd);
  45   while (1) {
  46         p = va_arg(argp, char *);
  47         if (p == (char *) NULL) break;
  48         write(fd, p, strlen(p));
  49   }
  50   va_end(argp);
  51 }
  52
  53 char *name;
  54
  55 void usage()
  56 {
  57   print(STDERR_FILENO, "Usage: ", name, " -snrvmpa\n", (char *) NULL);
  58   exit(EXIT_FAILURE);
  59 }
  60
  61 int main(argc, argv)
  62 int argc;
  63 char **argv;
  64 {
  65   int info;
  66   char *p;
  67   struct utsname un;
  68
  69   name = strrchr(argv[0], '/');
  70   if (name == NULL) name = argv[0]; else name++;
  71
  72   for (info = 0; argc > 1; argc--, argv++) {
  73         if (argv[1][0] == '-') {
  74                 for (p = &argv[1][1]; *p; p++) {
  75                         switch (*p) {
  76                                 case 'a': info |= ALL;      break;
  77                                 case 'm': info |= U_MACHINE;  break;
  78                                 case 'n': info |= NODENAME; break;
  79                                 case 'r': info |= RELEASE;  break;
  80                                 case 's': info |= SYSNAME;  break;
  81                                 case 'v': info |= RELEASE;  break;
  82                                 case 'p': info |= ARCH;     break;
  83                                 default: usage();
  84                         }
  85                 }
  86         } else {
  87                 usage();
  88         }
  89   }
  90
  91   if (info == 0) info = strcmp(name, "arch") == 0 ? ARCH : SYSNAME;
  92
  93   if (uname(&un) != 0) {
  94         print(STDERR_FILENO, "unable to determine uname values\n", (char *) NULL);
  95         exit(EXIT_FAILURE);
  96   }
  97
  98   if ((info & SYSNAME) != 0)
  99         print(STDOUT_FILENO, un.sysname, (char *) NULL);
 100   if ((info & NODENAME) != 0) {
 101         if ((info & (SYSNAME)) != 0)
 102                 print(STDOUT_FILENO, " ", (char *) NULL);
 103         print(STDOUT_FILENO, un.nodename, (char *) NULL);
 104   }
 105   if ((info & RELEASE) != 0) {
 106         if ((info & (SYSNAME|NODENAME)) != 0)
 107                 print(STDOUT_FILENO, " ", (char *) NULL);
 108         print(STDOUT_FILENO, un.release, (char *) NULL);
 109         print(STDOUT_FILENO, ".", (char *) NULL);
 110         print(STDOUT_FILENO, un.version, (char *) NULL);
 111   }
 112   if ((info & U_MACHINE) != 0) {
 113         if ((info & (SYSNAME|NODENAME|RELEASE)) != 0)
 114                 print(STDOUT_FILENO, " ", (char *) NULL);
 115         print(STDOUT_FILENO, un.machine, (char *) NULL);
 116   }
 117   if ((info & ARCH) != 0) {
 118         if ((info & (SYSNAME|NODENAME|RELEASE|U_MACHINE)) != 0)
 119                 print(STDOUT_FILENO, " ", (char *) NULL);
 120         print(STDOUT_FILENO, un.arch, (char *) NULL);
 121   }
 122   print(STDOUT_FILENO, "\n", (char *) NULL);
 123   return EXIT_SUCCESS;
 124 }