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/* A list of active translators.
Copyright (C) 2013,14 Free Software Foundation, Inc.
Written by Justus Winter <4winter@informatik.uni-hamburg.de>
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 the GNU Hurd. If not, see <http://www.gnu.org/licenses/>. */
#include <argz.h>
#include <hurd/fsys.h>
#include <hurd/ihash.h>
#include <hurd/ports.h>
#include <mach.h>
#include <mach/notify.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include "fshelp.h"
struct translator
{
struct port_info *pi;
char *name;
mach_port_t active;
};
/* The list of active translators. */
static struct hurd_ihash translator_ihash
= HURD_IHASH_INITIALIZER (HURD_IHASH_NO_LOCP);
/* The lock protecting the translator_ihash. */
static pthread_mutex_t translator_ihash_lock = PTHREAD_MUTEX_INITIALIZER;
static void
translator_ihash_cleanup (void *element, void *arg)
{
struct translator *translator = element;
if (translator->pi)
ports_port_deref (translator->pi);
/* No need to deallocate translator->active, we only keep the name of
the port, not a reference. */
free (translator->name);
free (translator);
}
/* Record an active translator being bound to the given file name
NAME. ACTIVE is the control port of the translator. */
error_t
fshelp_set_active_translator (struct port_info *pi,
const char *name,
mach_port_t active)
{
error_t err = 0;
pthread_mutex_lock (&translator_ihash_lock);
if (! translator_ihash.cleanup)
hurd_ihash_set_cleanup (&translator_ihash, translator_ihash_cleanup, NULL);
struct translator *t = NULL;
HURD_IHASH_ITERATE (&translator_ihash, value)
{
t = value;
if (strcmp (name, t->name) == 0)
goto update; /* Entry exists. */
}
t = malloc (sizeof (struct translator));
if (! t)
return ENOMEM;
t->active = MACH_PORT_NULL;
t->pi = NULL;
t->name = strdup (name);
if (! t->name)
{
err = errno;
free (t);
goto out;
}
err = hurd_ihash_add (&translator_ihash, (hurd_ihash_key_t) t, t);
if (err)
goto out;
update:
if (active)
{
if (t->pi != pi)
{
mach_port_t old;
err = mach_port_request_notification (mach_task_self (), active,
MACH_NOTIFY_DEAD_NAME, 0,
pi->port_right,
MACH_MSG_TYPE_MAKE_SEND_ONCE,
&old);
if (err)
return err;
if (old != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), old);
if (t->pi)
ports_port_deref (t->pi);
ports_port_ref (pi);
t->pi = pi;
}
/* No need to increment the reference count, we only keep the
name, not a reference. */
t->active = active;
}
else
hurd_ihash_remove (&translator_ihash, (hurd_ihash_key_t) t);
out:
pthread_mutex_unlock (&translator_ihash_lock);
return err;
}
/* Remove the active translator specified by its control port ACTIVE.
If there is no active translator with the given control port, this
does nothing. */
error_t
fshelp_remove_active_translator (mach_port_t active)
{
error_t err = 0;
pthread_mutex_lock (&translator_ihash_lock);
struct translator *t = NULL;
HURD_IHASH_ITERATE (&translator_ihash, value)
{
struct translator *v = value;
if (active == v->active)
{
t = v;
break;
}
}
if (t)
hurd_ihash_remove (&translator_ihash, (hurd_ihash_key_t) t);
pthread_mutex_unlock (&translator_ihash_lock);
return err;
}
/* Records the list of active translators into the argz vector
specified by TRANSLATORS filtered by FILTER. */
error_t
fshelp_get_active_translators (char **translators,
size_t *translators_len,
fshelp_filter filter)
{
error_t err = 0;
pthread_mutex_lock (&translator_ihash_lock);
HURD_IHASH_ITERATE (&translator_ihash, value)
{
struct translator *t = value;
if (filter)
{
char *dir = strdup (t->name);
if (! dir)
{
err = ENOMEM;
break;
}
err = filter (dirname (dir));
free (dir);
if (err)
{
err = 0;
continue; /* Skip this entry. */
}
}
err = argz_add (translators, translators_len,
t->name);
if (err)
break;
}
pthread_mutex_unlock (&translator_ihash_lock);
return err;
}
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