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/* The ps_context type, for per-procserver and somewhat global state.
Copyright (C) 1995,96,99,2000,02 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
This program 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.
This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <hurd/term.h>
#include "ps.h"
#include "common.h"
/* ---------------------------------------------------------------- */
/* Returns in PC a new ps_context for the proc server SERVER. If a memory
allocation error occurs, ENOMEM is returned, otherwise 0. */
error_t
ps_context_create (process_t server, struct ps_context **pc)
{
*pc = NEW (struct ps_context);
if (*pc == NULL)
return ENOMEM;
(*pc)->server = server;
(*pc)->user_hooks = 0;
hurd_ihash_init (&(*pc)->procs, HURD_IHASH_NO_LOCP);
hurd_ihash_init (&(*pc)->ttys, HURD_IHASH_NO_LOCP);
hurd_ihash_init (&(*pc)->ttys_by_cttyid, HURD_IHASH_NO_LOCP);
hurd_ihash_init (&(*pc)->users, HURD_IHASH_NO_LOCP);
hurd_ihash_set_cleanup (&(*pc)->procs,
(hurd_ihash_cleanup_t) _proc_stat_free, NULL);
hurd_ihash_set_cleanup (&(*pc)->ttys,
(hurd_ihash_cleanup_t) ps_tty_free, NULL);
hurd_ihash_set_cleanup (&(*pc)->users,
(hurd_ihash_cleanup_t) ps_user_free, NULL);
return 0;
}
/* Frees PC and any resources it consumes. */
void
ps_context_free (struct ps_context *pc)
{
hurd_ihash_destroy (&pc->procs);
hurd_ihash_destroy (&pc->ttys);
hurd_ihash_destroy (&pc->ttys_by_cttyid);
hurd_ihash_destroy (&pc->users);
free (pc);
}
/* ---------------------------------------------------------------- */
/* Return the value in HT indexed by the key ID. If it doesn't exist create
it by calling CREATE with ID and a return location pointer as arguments
(CREATE should return either an error-code or 0 if no error occurs), and
cache it in HT. */
static error_t
lookup (int id, hurd_ihash_t ht, error_t (*create)(int id, void **),
void **value)
{
*value = hurd_ihash_find (ht, id);
if (*value == NULL)
{
error_t err = create (id, value);
if (err)
return err;
hurd_ihash_add (ht, id, *value);
}
return 0;
}
/* Find a proc_stat for the process referred to by PID, and return it in
PS. If an error occurs, it is returned, otherwise 0. */
error_t
ps_context_find_proc_stat (struct ps_context *pc, pid_t pid, struct proc_stat **ps)
{
error_t create (int pid, void **value)
{
return _proc_stat_create (pid, pc, (struct proc_stat **)value);
}
return lookup (pid, &pc->procs, create, (void **)ps);
}
/* Find a ps_tty for the terminal referred to by the port TTY_PORT, and
return it in TTY. If an error occurs, it is returned, otherwise 0. */
error_t
ps_context_find_tty (struct ps_context *pc, mach_port_t tty_port,
struct ps_tty **tty)
{
return lookup (tty_port,
&pc->ttys,
(error_t (*)(int id, void **result))ps_tty_create,
(void **)tty);
}
/* Find a ps_tty for the terminal referred to by the ctty id port
CTTYID_PORT, and return it in TTY. If an error occurs, it is returned,
otherwise 0. */
error_t
ps_context_find_tty_by_cttyid (struct ps_context *pc, mach_port_t cttyid_port,
struct ps_tty **tty)
{
error_t create (int cttyid_port, void **value)
{
if (cttyid_port == MACH_PORT_NULL)
{
*value = 0;
return 0;
}
else
{
mach_port_t tty_port;
error_t err = termctty_open_terminal (cttyid_port, 0, &tty_port);
if (err)
return err;
else
return ps_context_find_tty (pc, tty_port, (struct ps_tty **)value);
}
}
return lookup (cttyid_port, &pc->ttys_by_cttyid, create, (void **)tty);
}
/* Find a ps_user for the user referred to by UID, and return it in U. */
error_t
ps_context_find_user (struct ps_context *pc, uid_t uid, struct ps_user **u)
{
return lookup (uid,
&pc->users,
(error_t (*)(int id, void **result))ps_user_create,
(void **) u);
}
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