diff options
| author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2014-11-04 18:46:42 +0100 |
|---|---|---|
| committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2014-12-09 09:34:51 +0100 |
| commit | 8c4d15d5b824fd02bd6909f6d254828732f3bb7b (patch) | |
| tree | c5d9448587d673d2c211b26c459868e19bc62c5c /kern | |
| parent | 8214da0d2e0e6f01b17c9d1dc1608f0ec3cf3be4 (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.c | 33 | ||||
| -rw-r--r-- | kern/task_notify.cli | 7 |
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> |