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/* Hash table functions
Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation
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; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Michael I. Bushnell. */
#include <mach.h>
#include <stddef.h>
#include <sys/types.h>
#include <hurd/hurd_types.h>
#include <string.h>
#include <stdlib.h>
#include <sys/resource.h>
#include "proc.h"
#include <hurd/ihash.h>
static struct hurd_ihash pghash
= HURD_IHASH_INITIALIZER (offsetof (struct pgrp, pg_hashloc));
static struct hurd_ihash pidhash
= HURD_IHASH_INITIALIZER (offsetof (struct proc, p_pidhashloc));
static struct hurd_ihash taskhash
= HURD_IHASH_INITIALIZER (offsetof (struct proc, p_taskhashloc));
static struct hurd_ihash sidhash
= HURD_IHASH_INITIALIZER (offsetof (struct session, s_hashloc));
/* Find the process corresponding to a given pid. */
struct proc *
pid_find (pid_t pid)
{
struct proc *p;
p = hurd_ihash_find (&pidhash, pid);
return (!p || p->p_dead) ? 0 : p;
}
/* Find the process corresponding to a given pid. Return it even if
it's dead. */
struct proc *
pid_find_allow_zombie (pid_t pid)
{
return hurd_ihash_find (&pidhash, pid);
}
/* Find the process corresponding to a given task. */
struct proc *
task_find (task_t task)
{
struct proc *p;
p = hurd_ihash_find (&taskhash, task) ? : add_tasks (task);
return (!p || p->p_dead) ? 0 : p;
}
/* Find the process corresponding to a given task, but
if we don't already know about it, just return 0. */
struct proc *
task_find_nocreate (task_t task)
{
struct proc *p;
p = hurd_ihash_find (&taskhash, task);
return (!p || p->p_dead) ? 0 : p;
}
/* Find the process corresponding to a given request port. */
struct proc *
reqport_find (mach_port_t reqport)
{
struct proc *p;
p = ports_lookup_port (proc_bucket, reqport, proc_class);
if (p && p->p_dead)
ports_port_deref (p);
return (!p || p->p_dead) ? 0 : p;
}
/* Find the process group corresponding to a given pgid. */
struct pgrp *
pgrp_find (pid_t pgid)
{
return hurd_ihash_find (&pghash, pgid);
}
/* Find the session corresponding to a given sid. */
struct session *
session_find (pid_t sid)
{
return hurd_ihash_find (&sidhash, sid);
}
/* Add a new process to the various hash tables. */
void
add_proc_to_hash (struct proc *p)
{
hurd_ihash_add (&pidhash, p->p_pid, p);
hurd_ihash_add (&taskhash, p->p_task, p);
}
/* Add a new process group to the various hash tables. */
void
add_pgrp_to_hash (struct pgrp *pg)
{
hurd_ihash_add (&pghash, pg->pg_pgid, pg);
}
/* Add a new session to the various hash tables. */
void
add_session_to_hash (struct session *s)
{
hurd_ihash_add (&sidhash, s->s_sid, s);
}
/* Remove a process group from the various hash tables. */
void
remove_pgrp_from_hash (struct pgrp *pg)
{
hurd_ihash_locp_remove (&pghash, pg->pg_hashloc);
}
/* Remove a process from the various hash tables. */
void
remove_proc_from_hash (struct proc *p)
{
hurd_ihash_locp_remove (&pidhash, p->p_pidhashloc);
hurd_ihash_locp_remove (&taskhash, p->p_taskhashloc);
}
/* Remove a session from the various hash tables. */
void
remove_session_from_hash (struct session *s)
{
hurd_ihash_locp_remove (&sidhash, s->s_hashloc);
}
/* Call function FUN of two args for each process. FUN's first arg is
the process, its second arg is ARG. */
void
prociterate (void (*fun) (struct proc *, void *), void *arg)
{
HURD_IHASH_ITERATE (&pidhash, value)
{
struct proc *p = value;
if (!p->p_dead)
(*fun)(p, arg);
}
}
/* Tell if a pid is available for use */
int
pidfree (pid_t pid)
{
return (!pid_find_allow_zombie (pid)
&& !pgrp_find (pid) && !session_find (pid));
}
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