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/* Hurd server introspection.
Copyright (C) 2014 Free Software Foundation, Inc.
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. If not, see <http://www.gnu.org/licenses/>. */
#include <error.h>
#include <hurd/introspection.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include "ports.h"
#include "hurd_port_U.h"
/* We service introspection requests on this port. */
static mach_port_t introspection_port;
/* We use a separate thread to service the introspection requests. It
is a straight forward Mach server for the hurd_port protocol. */
static void *
service_introspection_requests (void *arg)
{
error_t err;
err = mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
&introspection_port);
if (err)
{
error (0, err, "mach_port_allocate");
return NULL;
}
err = mach_port_insert_right (mach_task_self (),
introspection_port, introspection_port,
MACH_MSG_TYPE_MAKE_SEND);
if (err)
{
error (0, err, "mach_port_insert_right");
return NULL;
}
err = introspection_set_port (mach_task_self (), introspection_port);
if (err)
{
error (0, err, "introspection_set_port");
return NULL;
}
/* XXX mig should emit this declaration. */
boolean_t ports_hurd_port_server (mach_msg_header_t *InHeadP,
mach_msg_header_t *OutHeadP);
while (1)
mach_msg_server (ports_hurd_port_server, 0, introspection_port);
/* Not reached. */
return NULL;
}
/* Start the introspection server before main is called. */
static void __attribute__ ((constructor))
init (void)
{
error_t err;
pthread_t thread;
pthread_attr_t attr;
#define STACK_SIZE (64 * 1024)
pthread_attr_init (&attr);
pthread_attr_setstacksize (&attr, STACK_SIZE);
#undef STACK_SIZE
err = pthread_create (&thread, &attr,
service_introspection_requests, NULL);
if (err)
error (1, err, "pthread_create");
pthread_detach (thread);
}
/* Return the number of hard and weak references of the object
directly associated with the receive right NAME.
Return EINVAL if NAME does not denote a receive right managed by
the port-to-object mapper, or if the concept of reference counting
simply does not apply. */
error_t
ports_S_hurd_port_get_refcounts (mach_port_t port,
mach_port_t name,
natural_t *hard,
natural_t *weak)
{
struct references result;
struct port_info *pi;
if (port != introspection_port)
return EOPNOTSUPP;
pi = ports_lookup_port (0, name, 0);
if (pi == NULL)
return EINVAL;
refcounts_references (&pi->refcounts, &result);
*hard = result.hard - 1;
*weak = result.weak;
ports_port_deref (pi);
return 0;
}
static error_t
default_debug_info (const void *port, char *buffer, size_t size)
{
const struct port_info *pi = port;
snprintf (buffer, size,
"bucket: %s, class: %s",
pi->bucket->label, pi->class->label);
return 0;
}
/* Return a compact, human-readable description of the object related
with the receive right NAME.
This description is meant for debugging purposes and should include
relevant internal state. If possible, it should include
information that is meaningful in other contexts (like a file name,
or the inode number).
Return EINVAL if NAME does not denote a receive right managed by
the port-to-object mapper. */
error_t
ports_S_hurd_port_debug_info (mach_port_t port,
mach_port_t name,
char *info)
{
error_t err;
struct port_info *pi;
if (port != introspection_port)
return EOPNOTSUPP;
pi = ports_lookup_port (0, name, 0);
if (pi == NULL)
return EINVAL;
if (pi->class->debug_info)
err = pi->class->debug_info (pi, info, 1024 /* XXX */);
else
err = default_debug_info (pi, info, 1024 /* XXX */);
info[1023] = 0;
ports_port_deref (pi);
return err;
}
error_t
ports_S_hurd_port_trace_class_rpcs (mach_port_t port,
mach_port_t name,
mach_port_t trace_port)
{
struct port_info *pi;
if (port != introspection_port)
return EOPNOTSUPP;
pi = ports_lookup_port (0, name, 0);
if (pi == NULL)
return EINVAL;
if (MACH_PORT_VALID (pi->class->trace_port))
mach_port_deallocate (mach_task_self (), pi->class->trace_port);
pi->class->trace_port = trace_port;
return 0;
}
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