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/* The type ps_context_t, for per-procserver and somewhat global state.
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 "ps.h"
#include "common.h"
/* ---------------------------------------------------------------- */
/* Returns in PC a new ps_context_t for the proc server SERVER. If a memory
allocation error occurs, ENOMEM is returned, otherwise 0. */
error_t
ps_context_create(process_t server, ps_context_t *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;
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(ps_context_t pc)
{
ihash_free(pc->procs);
ihash_free(pc->procs);
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_t 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(ps_context_t pc, int pid, proc_stat_t *ps)
{
error_t create(int pid, void **value)
{
return _proc_stat_create(pid, pc, (proc_stat_t *)value);
}
return lookup(pid, pc->procs, create, (void **)ps);
}
/* Find a ps_tty_t 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(ps_context_t pc, int tty_port, ps_tty_t *tty)
{
return lookup(tty_port,
pc->ttys,
(error_t (*)(int id, void **result))ps_tty_create,
(void **)tty);
}
/* Find a ps_tty_t 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(ps_context_t pc, int cttyid_port, ps_tty_t *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, (ps_tty_t *)value);
}
}
return lookup(cttyid_port, pc->ttys, create, (void **)tty);
}
/* Find a ps_user_t for the user referred to by UID, and return it in U. */
error_t
ps_context_find_user(ps_context_t pc, int uid, ps_user_t *u)
{
return lookup(uid,
pc->users,
(error_t (*)(int id, void **result))ps_user_create,
(void **)u);
}
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