minix3/fs/procfs/main.c

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2020-02-21 00:59:27 +05:30
/* ProcFS - main.c - by Alen Stojanov and David van Moolenbroek */
#include "inc.h"
#include "cpuinfo.h"
static void init_hook(void);
/* The hook functions that will be called by VTreeFS. */
static struct fs_hooks hooks = {
init_hook,
NULL, /* cleanup_hook */
lookup_hook,
getdents_hook,
read_hook,
rdlink_hook,
NULL /* message_hook */
};
/*===========================================================================*
* construct_tree *
*===========================================================================*/
static void construct_tree(struct inode *dir, struct file *files)
{
/* Construct a tree of static files from a null-terminated array of
* file structures, recursively creating directories which have their
* associated data point to child file structures.
*/
struct file *file;
struct inode *node;
struct inode_stat stat;
stat.uid = SUPER_USER;
stat.gid = SUPER_USER;
stat.size = 0;
stat.dev = NO_DEV;
for (file = files; file->name != NULL; file++) {
stat.mode = file->mode;
node = add_inode(dir, file->name, NO_INDEX, &stat, (index_t) 0,
(cbdata_t) file->data);
assert(node != NULL);
if (S_ISDIR(file->mode))
construct_tree(node, (struct file *) file->data);
}
}
/*===========================================================================*
* init_hook *
*===========================================================================*/
static void init_hook(void)
{
/* Initialization hook. Generate the static part of the tree.
*/
static int first_time = 1;
struct inode *root;
if (first_time) {
root = get_root_inode();
construct_tree(root, root_files);
first_time = 0;
}
}
/*===========================================================================*
* main *
*===========================================================================*/
int main(void)
{
/* ProcFS entry point.
*/
struct inode_stat stat;
int r;
/* Initialize some state. If we are incompatible with the kernel, exit
* immediately.
*/
if ((r = init_tree()) != OK)
return r;
/* Properties of the root directory. */
stat.mode = DIR_ALL_MODE;
stat.uid = SUPER_USER;
stat.gid = SUPER_USER;
stat.size = 0;
stat.dev = NO_DEV;
/* Start VTreeFS. This call does not return. */
start_vtreefs(&hooks, NR_INODES, &stat, NR_PROCS + NR_TASKS);
return 0;
}