commands/simple/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 VERSION  ((unsigned) 0x08)
  27 #define U_MACHINE  ((unsigned) 0x10)
  28 #define ARCH     ((unsigned) 0x20)
  29
  30 _PROTOTYPE(int main, (int argc, char **argv ));
  31 _PROTOTYPE(void print, (int fd, ... ));
  32 _PROTOTYPE(void usage, (void ));
  33
  34 #ifdef __STDC__
  35 void print(int fd, ...)
  36 #else
  37 void print(fd)
  38 int fd;
  39 #endif
  40 {
  41 /* Print a sequence of strings onto the named channel. */
  42   va_list argp;
  43   char *p;
  44
  45   va_start(argp, fd);
  46   while (1) {
  47         p = va_arg(argp, char *);
  48         if (p == (char *) NULL) break;
  49         write(fd, p, strlen(p));
  50   }
  51   va_end(argp);
  52 }
  53
  54 char *name;
  55
  56 void usage()
  57 {
  58   print(STDERR_FILENO, "Usage: ", name, " -snrvmpa\n", (char *) NULL);
  59   exit(EXIT_FAILURE);
  60 }
  61
  62 int main(argc, argv)
  63 int argc;
  64 char **argv;
  65 {
  66   int info;
  67   char *p;
  68   struct utsname un;
  69
  70   name = strrchr(argv[0], '/');
  71   if (name == NULL) name = argv[0]; else name++;
  72
  73   for (info = 0; argc > 1; argc--, argv++) {
  74         if (argv[1][0] == '-') {
  75                 for (p = &argv[1][1]; *p; p++) {
  76                         switch (*p) {
  77                                 case 'a': info |= ALL;      break;
  78                                 case 'm': info |= U_MACHINE;  break;
  79                                 case 'n': info |= NODENAME; break;
  80                                 case 'r': info |= RELEASE;  break;
  81                                 case 's': info |= SYSNAME;  break;
  82                                 case 'v': info |= VERSION;  break;
  83                                 case 'p': info |= ARCH;     break;
  84                                 default: usage();
  85                         }
  86                 }
  87         } else {
  88                 usage();
  89         }
  90   }
  91
  92   if (info == 0) info = strcmp(name, "arch") == 0 ? ARCH : SYSNAME;
  93
  94   if (uname(&un) != 0) {
  95         print(STDERR_FILENO, "unable to determine uname values\n", (char *) NULL);
  96         exit(EXIT_FAILURE);
  97   }
  98
  99   if ((info & SYSNAME) != 0)
 100         print(STDOUT_FILENO, un.sysname, (char *) NULL);
 101   if ((info & NODENAME) != 0) {
 102         if ((info & (SYSNAME)) != 0)
 103                 print(STDOUT_FILENO, " ", (char *) NULL);
 104         print(STDOUT_FILENO, un.nodename, (char *) NULL);
 105   }
 106   if ((info & RELEASE) != 0) {
 107         if ((info & (SYSNAME|NODENAME)) != 0)
 108                 print(STDOUT_FILENO, " ", (char *) NULL);
 109         print(STDOUT_FILENO, un.release, (char *) NULL);
 110   }
 111   if ((info & VERSION) != 0) {
 112         if ((info & (SYSNAME|NODENAME|RELEASE)) != 0)
 113                 print(STDOUT_FILENO, " ", (char *) NULL);
 114         print(STDOUT_FILENO, un.version, (char *) NULL);
 115   }
 116   if ((info & U_MACHINE) != 0) {
 117         if ((info & (SYSNAME|NODENAME|RELEASE|VERSION)) != 0)
 118                 print(STDOUT_FILENO, " ", (char *) NULL);
 119         print(STDOUT_FILENO, un.machine, (char *) NULL);
 120   }
 121   if ((info & ARCH) != 0) {
 122         if ((info & (SYSNAME|NODENAME|RELEASE|VERSION|U_MACHINE)) != 0)
 123                 print(STDOUT_FILENO, " ", (char *) NULL);
 124         print(STDOUT_FILENO, un.arch, (char *) NULL);
 125   }
 126   print(STDOUT_FILENO, "\n", (char *) NULL);
 127   return EXIT_SUCCESS;
 128 }