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/* Mach task store backend
Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdio.h>
#include <string.h>
#include <hurd.h>
#include <mach/machine/vm_param.h>
#include "store.h"
static process_t
proc_server ()
{
static process_t proc = MACH_PORT_NULL;
if (proc == MACH_PORT_NULL)
proc = getproc ();
return proc;
}
static error_t
topen (const char *name, task_t *task)
{
char *name_end;
pid_t pid = strtoul (name, &name_end, 0);
if (*name == '\0' || *name_end != '\0')
return EINVAL;
return proc_pid2task (proc_server (), pid, task);
}
static void
tclose (struct store *store)
{
mach_port_deallocate (mach_task_self (), store->port);
store->port = MACH_PORT_NULL;
}
static error_t
task_read (struct store *store,
store_offset_t addr, size_t index, size_t amount, void **buf, size_t *len)
{
size_t bsize = store->block_size;
return vm_read (store->port, addr * bsize, amount, (vm_address_t *)buf, len);
}
static error_t
task_write (struct store *store,
store_offset_t addr, size_t index, void *buf, size_t len, size_t *amount)
{
size_t bsize = store->block_size;
error_t err = vm_write (store->port, addr * bsize, (vm_address_t)buf, len);
if (! err)
*amount = len;
return err;
}
static error_t
task_decode (struct store_enc *enc, const struct store_class *const *classes,
struct store **store)
{
return store_std_leaf_decode (enc, _store_task_create, store);
}
static error_t
task_open (const char *name, int flags,
const struct store_class *const *classes,
struct store **store)
{
return store_task_open (name, flags, store);
}
static error_t
task_set_flags (struct store *store, int flags)
{
if ((flags & ~(STORE_INACTIVE | STORE_ENFORCED)) != 0)
/* Trying to set flags we don't support. */
return EINVAL;
if ((flags & STORE_ENFORCED)
&& (store->num_runs > 0
|| store->runs[0].start != 0
|| store->runs[0].length != (VM_MAX_ADDRESS >> store->log2_block_size)))
/* Kernel only enforces the whole thing... */
return EINVAL;
if (flags & STORE_INACTIVE)
tclose (store);
store->flags |= flags; /* When inactive, anything goes. */
return 0;
}
static error_t
task_clear_flags (struct store *store, int flags)
{
error_t err = 0;
if ((flags & ~(STORE_INACTIVE | STORE_ENFORCED)) != 0)
err = EINVAL;
if (!err && (flags & STORE_INACTIVE))
err = store->name ? topen (store->name, &store->port) : ESRCH;
if (! err)
store->flags &= ~flags;
return err;
}
struct store_class
store_task_class =
{
STORAGE_TASK, "task", task_read, task_write,
store_std_leaf_allocate_encoding, store_std_leaf_encode, task_decode,
task_set_flags, task_clear_flags, 0, 0, 0, task_open
};
/* Return a new store in STORE referring to the mach task TASK. Consumes
the send right TASK. */
error_t
store_task_create (task_t task, int flags, struct store **store)
{
struct store_run run;
run.start = 0;
run.length = VM_MAX_ADDRESS / vm_page_size;
flags |= STORE_ENFORCED; /* 'cause it's the whole task. */
return _store_task_create (task, flags, vm_page_size, &run, 1, store);
}
/* Like store_task_create, but doesn't query the task for information. */
error_t
_store_task_create (task_t task, int flags, size_t block_size,
const struct store_run *runs, size_t num_runs,
struct store **store)
{
error_t err = 0;
if (block_size >= vm_page_size)
err = _store_create (&store_task_class,
task, flags, block_size, runs, num_runs, 0, store);
else
err = EINVAL; /* block size less than page size. */
if (! err)
{
pid_t pid;
err = proc_task2pid (proc_server (), task, &pid);
if (! err)
{
char buf[20];
snprintf (buf, sizeof buf, "%u", pid);
err = store_set_name (*store, buf);
}
if (err)
store_free (*store);
}
return err;
}
/* Open the task NAME, and return the corresponding store in STORE. */
error_t
store_task_open (const char *name, int flags, struct store **store)
{
task_t task;
error_t err = topen (name, &task);
if (! err)
{
err = store_task_create (task, flags, store);
if (err)
mach_port_deallocate (mach_task_self (), task);
}
return err;
}
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