xnu-3789.1.32.tar.gz

[apple/xnu.git] / bsd / dev / dtrace / dtrace_subr.c

diff --git a/bsd/dev/dtrace/dtrace_subr.c b/bsd/dev/dtrace/dtrace_subr.c
index ef857094da7cc6c6d055cebd90019ed33d616cdd..3bc601af83d994c97eb0219fb394510ef0cee11c 100644 (file)
--- a/bsd/dev/dtrace/dtrace_subr.c
+++ b/bsd/dev/dtrace/dtrace_subr.c
@@ -295,6 +295,47 @@ dtrace_invop_remove(int (*func)(uintptr_t, uintptr_t *, uintptr_t))
        kmem_free(hdlr, sizeof (dtrace_invop_hdlr_t));
 }
 
+static minor_t next_minor = 0;
+static dtrace_state_t* dtrace_clients[DTRACE_NCLIENTS] = {NULL};
+
+
+minor_t
+dtrace_state_reserve(void)
+{
+       for (int i = 0; i < DTRACE_NCLIENTS; i++) {
+               minor_t minor = atomic_add_32(&next_minor, 1) % DTRACE_NCLIENTS;
+               if (dtrace_clients[minor] == NULL)
+                       return minor;
+       }
+       return 0;
+}
+
+dtrace_state_t*
+dtrace_state_get(minor_t minor)
+{
+       ASSERT(minor < DTRACE_NCLIENTS);
+       return dtrace_clients[minor];
+}
+
+dtrace_state_t*
+dtrace_state_allocate(minor_t minor)
+{
+       dtrace_state_t *state = _MALLOC(sizeof(dtrace_state_t), M_TEMP, M_ZERO | M_WAITOK);
+       if (dtrace_casptr(&dtrace_clients[minor], NULL, state) != NULL) {
+               // We have been raced by another client for this number, abort
+               _FREE(state, M_TEMP);
+               return NULL;
+       }
+       return state;
+}
+
+void
+dtrace_state_free(minor_t minor)
+{
+       dtrace_state_t *state = dtrace_clients[minor];
+       dtrace_clients[minor] = NULL;
+       _FREE(state, M_TEMP);
+}
 
 
 
@@ -317,11 +358,8 @@ dtrace_is_restricted(void)
        return FALSE;
 }
 
-/*
- * Check if DTrace is running on a machine currently configured for Apple Internal development
- */
 boolean_t
-dtrace_is_running_apple_internal(void)
+dtrace_are_restrictions_relaxed(void)
 {
 #if CONFIG_CSR
        if (csr_check(CSR_ALLOW_APPLE_INTERNAL) == 0)
@@ -336,13 +374,20 @@ dtrace_fbt_probes_restricted(void)
 {
 
 #if CONFIG_CSR
-       if (dtrace_is_restricted() && !dtrace_is_running_apple_internal())
+       if (dtrace_is_restricted() && !dtrace_are_restrictions_relaxed())
                return TRUE;
 #endif
 
        return FALSE;
 }
 
+boolean_t
+dtrace_sdt_probes_restricted(void)
+{
+
+       return FALSE;
+}
+
 /*
  * Check if the process can be attached.
  */