139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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* $FreeBSD$
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*
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*/
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static int
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dtrace_unload()
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{
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dtrace_state_t *state;
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int error = 0;
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/*
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* Check if there is still an event handler callback
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* registered.
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*/
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if (eh_tag != 0) {
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/* De-register the device cloning event handler. */
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EVENTHANDLER_DEREGISTER(dev_clone, eh_tag);
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eh_tag = 0;
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/* Stop device cloning. */
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clone_cleanup(&dtrace_clones);
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}
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mutex_enter(&dtrace_provider_lock);
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mutex_enter(&dtrace_lock);
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mutex_enter(&cpu_lock);
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ASSERT(dtrace_opens == 0);
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if (dtrace_helpers > 0) {
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mutex_exit(&cpu_lock);
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mutex_exit(&dtrace_lock);
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mutex_exit(&dtrace_provider_lock);
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return (EBUSY);
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}
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if (dtrace_unregister((dtrace_provider_id_t)dtrace_provider) != 0) {
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mutex_exit(&cpu_lock);
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mutex_exit(&dtrace_lock);
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mutex_exit(&dtrace_provider_lock);
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return (EBUSY);
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}
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dtrace_provider = NULL;
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if ((state = dtrace_anon_grab()) != NULL) {
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/*
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* If there were ECBs on this state, the provider should
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* have not been allowed to detach; assert that there is
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* none.
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*/
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ASSERT(state->dts_necbs == 0);
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dtrace_state_destroy(state);
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}
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bzero(&dtrace_anon, sizeof (dtrace_anon_t));
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mutex_exit(&cpu_lock);
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if (dtrace_helptrace_enabled) {
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kmem_free(dtrace_helptrace_buffer, 0);
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dtrace_helptrace_buffer = NULL;
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}
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if (dtrace_probes != NULL) {
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kmem_free(dtrace_probes, 0);
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dtrace_probes = NULL;
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dtrace_nprobes = 0;
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}
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dtrace_hash_destroy(dtrace_bymod);
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dtrace_hash_destroy(dtrace_byfunc);
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dtrace_hash_destroy(dtrace_byname);
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dtrace_bymod = NULL;
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dtrace_byfunc = NULL;
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dtrace_byname = NULL;
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kmem_cache_destroy(dtrace_state_cache);
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delete_unrhdr(dtrace_arena);
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if (dtrace_toxrange != NULL) {
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kmem_free(dtrace_toxrange, 0);
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dtrace_toxrange = NULL;
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dtrace_toxranges = 0;
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dtrace_toxranges_max = 0;
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}
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ASSERT(dtrace_vtime_references == 0);
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ASSERT(dtrace_opens == 0);
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ASSERT(dtrace_retained == NULL);
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mutex_exit(&dtrace_lock);
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mutex_exit(&dtrace_provider_lock);
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mutex_destroy(&dtrace_meta_lock);
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mutex_destroy(&dtrace_provider_lock);
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mutex_destroy(&dtrace_lock);
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mutex_destroy(&dtrace_errlock);
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/* XXX Hack */
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mutex_destroy(&mod_lock);
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/* Reset our hook for exceptions. */
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dtrace_invop_uninit();
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/*
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* Reset our hook for thread switches, but ensure that vtime isn't
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* active first.
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*/
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dtrace_vtime_active = 0;
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dtrace_vtime_switch_func = NULL;
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/* Unhook from the trap handler. */
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dtrace_trap_func = NULL;
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return (error);
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}
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