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/* The ps_context type, for per-procserver and somewhat global state.
Copyright (C) 1995,96,99,2000 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)
{
error_t err_procs, err_ttys, err_ttys_by_cttyid, err_users;
*pc = NEW (struct ps_context);
if (*pc == NULL)
return ENOMEM;
(*pc)->server = server;
(*pc)->user_hooks = 0;
err_procs = ihash_create (&(*pc)->procs);
err_ttys = ihash_create (&(*pc)->ttys);
err_ttys_by_cttyid = ihash_create (&(*pc)->ttys_by_cttyid);
err_users = ihash_create (&(*pc)->users);
if (err_procs || err_ttys || err_ttys_by_cttyid)
/* Some allocation error occurred, backout any successful ones and fail. */
{
if (!err_procs) ihash_free ((*pc)->procs);
if (!err_users) ihash_free ((*pc)->users);
if (!err_ttys) ihash_free ((*pc)->ttys);
if (!err_ttys_by_cttyid) ihash_free ((*pc)->ttys_by_cttyid);
free (*pc);
return ENOMEM;
}
ihash_set_cleanup ((*pc)->procs,
(void (*)(void *, void *arg))_proc_stat_free,
NULL);
ihash_set_cleanup ((*pc)->ttys,
(void (*)(void *, void *arg))ps_tty_free,
NULL);
ihash_set_cleanup ((*pc)->users,
(void (*)(void *, void *arg))ps_user_free,
NULL);
return 0;
}
/* Frees PC and any resources it consumes. */
void
ps_context_free (struct ps_context *pc)
{
ihash_free (pc->procs);
ihash_free (pc->ttys);
ihash_free (pc->ttys_by_cttyid);
ihash_free (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, ihash_t ht, error_t (*create)(int id, void **), void **value)
{
*value = ihash_find (ht, id);
if (*value == NULL)
{
error_t err = create (id, value);
if (err)
return err;
ihash_add (ht, id, *value, NULL);
}
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
{
int 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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