user/init.c

   1 #include <inc/lib.h>
   2
   3 struct {
   4         char msg1[5000];
   5         char msg2[1000];
   6 } data = {
   7         "this is initialized data",
   8         "so is this"
   9 };
  10
  11 char bss[6000];
  12
  13 int
  14 sum(const char *s, int n)
  15 {
  16         int i, tot = 0;
  17         for (i = 0; i < n; i++)
  18                 tot ^= i * s[i];
  19         return tot;
  20 }
  21
  22 void
  23 umain(int argc, char **argv)
  24 {
  25         int i, r, x, want;
  26
  27         cprintf("init: running\n");
  28
  29         want = 0xf989e;
  30         if ((x = sum((char*)&data, sizeof data)) != want)
  31                 cprintf("init: data is not initialized: got sum %08x wanted %08x\n",
  32                         x, want);
  33         else
  34                 cprintf("init: data seems okay\n");
  35         if ((x = sum(bss, sizeof bss)) != 0)
  36                 cprintf("bss is not initialized: wanted sum 0 got %08x\n", x);
  37         else
  38                 cprintf("init: bss seems okay\n");
  39
  40         cprintf("init: args:");
  41         for (i = 0; i < argc; i++)
  42                 cprintf(" '%s'", argv[i]);
  43         cprintf("\n");
  44
  45         cprintf("init: running sh\n");
  46
  47         // being run directly from kernel, so no file descriptors open yet
  48         close(0);
  49         if ((r = opencons()) < 0)
  50                 panic("opencons: %e", r);
  51         if (r != 0)
  52                 panic("first opencons used fd %d", r);
  53         if ((r = dup(0, 1)) < 0)
  54                 panic("dup: %e", r);
  55         while (1) {
  56                 cprintf("init: starting sh\n");
  57                 r = spawnl("/sh", "sh", (char*)0);
  58                 if (r < 0) {
  59                         cprintf("init: spawn sh: %e\n", r);
  60                         continue;
  61                 }
  62                 wait(r);
  63         }
  64 }