servers/procfs/main.c

   1 /* ProcFS - main.c - by Alen Stojanov and David van Moolenbroek */
   2
   3 #include "inc.h"
   4 #include "cpuinfo.h"
   5
   6 static void init_hook(void);
   7
   8 /* The hook functions that will be called by VTreeFS. */
   9 static struct fs_hooks hooks = {
  10         init_hook,
  11         NULL,           /* cleanup_hook */
  12         lookup_hook,
  13         getdents_hook,
  14         read_hook,
  15         rdlink_hook,
  16         NULL            /* message_hook */
  17 };
  18
  19 /*===========================================================================*
  20  *                              construct_tree                               *
  21  *===========================================================================*/
  22 static void construct_tree(struct inode *dir, struct file *files)
  23 {
  24         /* Construct a tree of static files from a null-terminated array of
  25          * file structures, recursively creating directories which have their
  26          * associated data point to child file structures.
  27          */
  28         struct file *file;
  29         struct inode *node;
  30         struct inode_stat stat;
  31
  32         stat.uid = SUPER_USER;
  33         stat.gid = SUPER_USER;
  34         stat.size = 0;
  35         stat.dev = NO_DEV;
  36
  37         for (file = files; file->name != NULL; file++) {
  38                 stat.mode = file->mode;
  39
  40                 node = add_inode(dir, file->name, NO_INDEX, &stat, (index_t) 0,
  41                         (cbdata_t) file->data);
  42
  43                 assert(node != NULL);
  44
  45                 if (S_ISDIR(file->mode))
  46                         construct_tree(node, (struct file *) file->data);
  47         }
  48 }
  49
  50 /*===========================================================================*
  51  *                              init_hook                                    *
  52  *===========================================================================*/
  53 static void init_hook(void)
  54 {
  55         /* Initialization hook. Generate the static part of the tree.
  56          */
  57         static int first_time = 1;
  58         struct inode *root;
  59
  60         if (first_time) {
  61                 root = get_root_inode();
  62
  63                 construct_tree(root, root_files);
  64
  65                 first_time = 0;
  66         }
  67 }
  68
  69 /*===========================================================================*
  70  *                              main                                         *
  71  *===========================================================================*/
  72 int main(void)
  73 {
  74         /* ProcFS entry point.
  75          */
  76         struct inode_stat stat;
  77         int r;
  78
  79         /* Initialize some state. If we are incompatible with the kernel, exit
  80          * immediately.
  81          */
  82         if ((r = init_tree()) != OK)
  83                 return r;
  84
  85         /* Properties of the root directory. */
  86         stat.mode       = DIR_ALL_MODE;
  87         stat.uid        = SUPER_USER;
  88         stat.gid        = SUPER_USER;
  89         stat.size       = 0;
  90         stat.dev        = NO_DEV;
  91
  92         /* Start VTreeFS. This call does not return. */
  93         start_vtreefs(&hooks, NR_INODES, &stat, NR_PROCS + NR_TASKS);
  94
  95         return 0;
  96 }