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#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <mach.h>
#include <hurd/netfs.h>
#include <hurd/fshelp.h>
#include "procfs.h"
struct netnode
{
const struct procfs_node_ops *ops;
void *hook;
/* (cached) contents of the node */
char *contents;
ssize_t contents_len;
/* parent directory, if applicable */
struct node *parent;
};
void
procfs_cleanup_contents_with_free (void *hook, char *cont, ssize_t len)
{
free (cont);
}
void
procfs_cleanup_contents_with_vm_deallocate (void *hook, char *cont, ssize_t len)
{
vm_deallocate (mach_task_self (), (vm_address_t) cont, (vm_size_t) len);
}
struct node *procfs_make_node (const struct procfs_node_ops *ops, void *hook)
{
struct netnode *nn;
struct node *np;
nn = malloc (sizeof *nn);
if (! nn)
goto fail;
memset (nn, 0, sizeof *nn);
nn->ops = ops;
nn->hook = hook;
np = netfs_make_node (nn);
if (! np)
goto fail;
np->nn = nn;
memset (&np->nn_stat, 0, sizeof np->nn_stat);
np->nn_translated = 0;
if (np->nn->ops->lookup)
np->nn_stat.st_mode = S_IFDIR | 0555;
else
np->nn_stat.st_mode = S_IFREG | 0444;
return np;
fail:
if (ops->cleanup)
ops->cleanup (hook);
free (nn);
return NULL;
}
void procfs_node_chown (struct node *np, uid_t owner)
{
np->nn_stat.st_uid = owner;
}
void procfs_node_chmod (struct node *np, mode_t mode)
{
np->nn_stat.st_mode = (np->nn_stat.st_mode & S_IFMT) | mode;
np->nn_translated = np->nn_stat.st_mode;
}
void procfs_node_chtype (struct node *np, mode_t type)
{
np->nn_stat.st_mode = (np->nn_stat.st_mode & ~S_IFMT) | type;
np->nn_translated = np->nn_stat.st_mode;
if (type == S_IFLNK)
procfs_node_chmod (np, 0777);
}
/* FIXME: possibly not the fastest hash function... */
ino64_t
procfs_make_ino (struct node *np, const char *filename)
{
unsigned short x[3];
if (! strcmp (filename, "."))
return np->nn_stat.st_ino;
if (! strcmp (filename, ".."))
return np->nn->parent ? np->nn->parent->nn_stat.st_ino : /* FIXME: */ 42;
assert (sizeof np->nn_stat.st_ino > sizeof x);
memcpy (x, &np->nn_stat.st_ino, sizeof x);
while (*filename)
{
x[0] ^= *(filename++);
jrand48 (x);
}
return (unsigned long) jrand48 (x);
}
error_t procfs_get_contents (struct node *np, char **data, ssize_t *data_len)
{
if (np->nn->ops->enable_refresh_hack_and_break_readdir && np->nn->contents)
{
if (np->nn->ops->cleanup_contents)
np->nn->ops->cleanup_contents (np->nn->hook, np->nn->contents,
np->nn->contents_len);
np->nn->contents = NULL;
}
if (! np->nn->contents && np->nn->ops->get_contents)
{
char *contents;
ssize_t contents_len;
error_t err;
contents_len = -1;
err = np->nn->ops->get_contents (np->nn->hook, &contents, &contents_len);
if (err)
return err;
if (contents_len < 0)
return ENOMEM;
np->nn->contents = contents;
np->nn->contents_len = contents_len;
}
*data = np->nn->contents;
*data_len = np->nn->contents_len;
return 0;
}
error_t procfs_lookup (struct node *np, const char *name, struct node **npp)
{
error_t err = ENOENT;
if (err && ! strcmp (name, "."))
{
netfs_nref(*npp = np);
err = 0;
}
if (err && np->nn->parent && ! strcmp (name, ".."))
{
netfs_nref(*npp = np->nn->parent);
err = 0;
}
if (err && np->nn->ops->lookup)
{
err = np->nn->ops->lookup (np->nn->hook, name, npp);
if (! err)
{
(*npp)->nn_stat.st_ino = procfs_make_ino (np, name);
netfs_nref ((*npp)->nn->parent = np);
}
}
return err;
}
void procfs_cleanup (struct node *np)
{
if (np->nn->contents && np->nn->ops->cleanup_contents)
np->nn->ops->cleanup_contents (np->nn->hook, np->nn->contents, np->nn->contents_len);
if (np->nn->ops->cleanup)
np->nn->ops->cleanup (np->nn->hook);
if (np->nn->parent)
netfs_nrele (np->nn->parent);
free (np->nn);
}
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