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/* dir-changed.c - Handling dir changed notifications.
Copyright (C) 2002 Free Software Foundation, Inc.
Written by Marcus Brinkmann.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <errno.h>
#include <dirent.h>
#include <assert.h>
#include <mach.h>
#include <cthreads.h>
#include "cons.h"
#include "fs_notify_S.h"
static error_t
add_one (cons_t cons, char *name)
{
unsigned long int nr;
char *tail;
errno = 0;
nr = strtoul (name, &tail, 10);
if (!errno && *tail == '\0' && nr > 0)
{
vcons_list_t vcons_entry;
return cons_lookup (cons, nr, 1, &vcons_entry);
}
return 0;
}
static error_t
lookup_one (cons_t cons, char *name, vcons_list_t *vcons_entry)
{
unsigned long int nr;
char *tail;
errno = 0;
nr = strtoul (name, &tail, 10);
if (!errno && *tail == '\0' && nr > 0)
return cons_lookup (cons, nr, 0, vcons_entry);
return 0;
}
kern_return_t
cons_S_dir_changed (cons_notify_t notify, natural_t tickno,
dir_changed_type_t change, string_t name)
{
error_t err;
cons_t cons;
if (!notify || !notify->cons)
return EOPNOTSUPP;
cons = notify->cons;
mutex_lock (&cons->lock);
switch (change)
{
case DIR_CHANGED_NULL:
{
DIR *dir = cons->dir;
struct dirent *dent;
do
{
errno = 0;
dent = readdir (dir);
if (!dent && errno)
err = errno;
else if (dent)
err = add_one (cons, dent->d_name);
}
while (dent && !err);
if (err)
assert ("Unexpected error"); /* XXX */
}
break;
case DIR_CHANGED_NEW:
{
err = add_one (cons, name);
if (err)
assert ("Unexpected error"); /* XXX */
}
break;
case DIR_CHANGED_UNLINK:
{
vcons_list_t vcons_entry;
err = lookup_one (cons, name, &vcons_entry);
if (!err)
{
cons_vcons_remove (cons, vcons_entry);
if (vcons_entry->prev)
vcons_entry->prev->next = vcons_entry->next;
else
cons->vcons_list = vcons_entry->next;
if (vcons_entry->next)
vcons_entry->next->prev = vcons_entry->prev;
else
cons->vcons_last = vcons_entry->prev;
free (vcons_entry);
}
}
break;
case DIR_CHANGED_RENUMBER:
default:
assert ("Unexpected dir-changed type.");
mutex_unlock (&cons->lock);
return EINVAL;
}
mutex_unlock (&cons->lock);
return 0;
}
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