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authorJustus Winter <4winter@informatik.uni-hamburg.de>2014-11-04 18:46:42 +0100
committerJustus Winter <4winter@informatik.uni-hamburg.de>2014-12-09 09:34:51 +0100
commit8c4d15d5b824fd02bd6909f6d254828732f3bb7b (patch)
treec5d9448587d673d2c211b26c459868e19bc62c5c /kern
parent8214da0d2e0e6f01b17c9d1dc1608f0ec3cf3be4 (diff)
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.
Diffstat (limited to 'kern')
-rw-r--r--kern/task.c33
-rw-r--r--kern/task_notify.cli7
2 files changed, 40 insertions, 0 deletions
diff --git a/kern/task.c b/kern/task.c
index 44963c6..a11fb8e 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;
@@ -1249,3 +1261,24 @@ 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>