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From 19c34e37ddc72850b097fbb46823d108dbb984bb Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 4 Nov 2014 18:46:42 +0100
Subject: [PATCH gnumach 1/2] kern: provide notifications about new tasks
These notifications are sent to the port registered via
`register_new_task_notification' and provide a robust parental
relation between tasks to a userspace server.
* Makefrag.am: Add task_notify.defs.
* include/mach/gnumach.defs: Add register_new_task_notification.
* include/mach/task_notify.defs: New file.
* kern/task.c (new_task_notification): New variable.
(task_create): Send new task notifications.
(register_new_task_notification): Add server function.
* kern/task_notify.cli: New file.
---
Makefrag.am | 8 ++++++++
include/mach/gnumach.defs | 8 ++++++++
include/mach/task_notify.defs | 36 ++++++++++++++++++++++++++++++++++++
kern/task.c | 33 +++++++++++++++++++++++++++++++++
kern/task_notify.cli | 7 +++++++
5 files changed, 92 insertions(+)
create mode 100644 include/mach/task_notify.defs
create mode 100644 kern/task_notify.cli
diff --git a/Makefrag.am b/Makefrag.am
index 5e98b21..410f56d 100644
--- a/Makefrag.am
+++ b/Makefrag.am
@@ -364,6 +364,7 @@ include_mach_HEADERS = \
include/mach/mach.defs \
include/mach/mach4.defs \
include/mach/gnumach.defs \
+ include/mach/task_notify.defs \
include/mach/mach_host.defs \
include/mach/mach_port.defs \
include/mach/mach_types.defs \
@@ -488,6 +489,13 @@ nodist_libkernel_a_SOURCES += \
# device/device_reply.user.defs
# device/memory_object_reply.user.defs
+nodist_lib_dep_tr_for_defs_a_SOURCES += \
+ kern/task_notify.user.defs.c
+nodist_libkernel_a_SOURCES += \
+ kern/task_notify.user.h \
+ kern/task_notify.user.c \
+ kern/task_notify.user.msgids
+
# Server stubs.
nodist_lib_dep_tr_for_defs_a_SOURCES += \
device/device.server.defs.c \
diff --git a/include/mach/gnumach.defs b/include/mach/gnumach.defs
index 6cfbb0d..bac3b09 100644
--- a/include/mach/gnumach.defs
+++ b/include/mach/gnumach.defs
@@ -72,3 +72,11 @@ simpleroutine thread_terminate_release(
simpleroutine task_set_name(
task : task_t;
name : kernel_debug_name_t);
+
+/*
+ * Register a port to which a notification about newly created tasks
+ * are sent.
+ */
+routine register_new_task_notification(
+ host_priv : host_priv_t;
+ notification : mach_port_send_t);
diff --git a/include/mach/task_notify.defs b/include/mach/task_notify.defs
new file mode 100644
index 0000000..5485d4e
--- /dev/null
+++ b/include/mach/task_notify.defs
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2014 Free Software Foundation
+ *
+ * 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 of the License, 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, see <http://www.gnu.org/licenses/>.
+ */
+
+subsystem
+#if KERNEL_SERVER
+ KernelServer
+#endif /* KERNEL_SERVER */
+#if KERNEL_USER
+ KernelUser
+#endif /* KERNEL_USER */
+ task_notify 4400;
+
+#include <mach/std_types.defs>
+#include <mach/mach_types.defs>
+
+/* These notifications are sent to the port registered via
+ `register_new_task_notification' and provide a robust parental
+ relation between tasks. */
+simpleroutine mach_notify_new_task(
+ notify : mach_port_t;
+ task : task_t;
+ parent : task_t);
diff --git a/kern/task.c b/kern/task.c
index 20acc6a..bcc2a4e 100644
--- a/kern/task.c
+++ b/kern/task.c
@@ -50,12 +50,16 @@
#include <kern/sched_prim.h> /* for thread_wakeup */
#include <kern/ipc_tt.h>
#include <kern/syscall_emulation.h>
+#include <kern/task_notify.user.h>
#include <vm/vm_kern.h> /* for kernel_map, ipc_kernel_map */
#include <machine/machspl.h> /* for splsched */
task_t kernel_task = TASK_NULL;
struct kmem_cache task_cache;
+/* Where to send notifications about newly created tasks. */
+ipc_port_t new_task_notification = NULL;
+
void task_init(void)
{
kmem_cache_init(&task_cache, "task", sizeof(struct task), 0,
@@ -169,6 +173,14 @@ kern_return_t task_create(
snprintf (new_task->name, sizeof new_task->name, "%p", new_task);
+ if (new_task_notification != NULL) {
+ task_reference (new_task);
+ task_reference (parent_task);
+ mach_notify_new_task (new_task_notification,
+ convert_task_to_port (new_task),
+ convert_task_to_port (parent_task));
+ }
+
ipc_task_enable(new_task);
*child_task = new_task;
@@ -1230,3 +1242,24 @@ task_ras_control(
#endif /* FAST_TAS */
return ret;
}
+
+/*
+ * register_new_task_notification
+ *
+ * Register a port to which a notification about newly created
+ * tasks are sent.
+ */
+kern_return_t
+register_new_task_notification(
+ const host_t host,
+ ipc_port_t notification)
+{
+ if (host == HOST_NULL)
+ return KERN_INVALID_HOST;
+
+ if (new_task_notification != NULL)
+ return KERN_NO_ACCESS;
+
+ new_task_notification = notification;
+ return KERN_SUCCESS;
+}
diff --git a/kern/task_notify.cli b/kern/task_notify.cli
new file mode 100644
index 0000000..c6c85d9
--- /dev/null
+++ b/kern/task_notify.cli
@@ -0,0 +1,7 @@
+/* XXX */
+
+/* This is a client presentation file. */
+
+#define KERNEL_USER 1
+
+#include <mach/task_notify.defs>
--
2.1.1
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