88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Eric van Gyzen
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Free a pending callout. This was useful for testing the
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* "show callout_last" ddb command.
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*/
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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static struct callout callout_free;
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static struct mtx callout_free_mutex;
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static int callout_free_arg;
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static void
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callout_free_func(void *arg)
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{
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printf("squirrel!\n");
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mtx_destroy(&callout_free_mutex);
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memset(&callout_free, 'C', sizeof(callout_free));
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}
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static int
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callout_free_load(module_t mod, int cmd, void *arg)
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{
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int error;
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switch (cmd) {
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case MOD_LOAD:
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mtx_init(&callout_free_mutex, "callout_free", NULL, MTX_DEF);
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/*
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* Do not pass CALLOUT_RETURNUNLOCKED so the callout
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* subsystem will unlock the "destroyed" mutex.
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*/
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callout_init_mtx(&callout_free, &callout_free_mutex, 0);
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printf("callout_free_func = %p\n", callout_free_func);
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printf("callout_free_arg = %p\n", &callout_free_arg);
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callout_reset(&callout_free, hz/10, callout_free_func,
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&callout_free_arg);
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error = 0;
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break;
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case MOD_UNLOAD:
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error = 0;
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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DEV_MODULE(callout_free, callout_free_load, NULL);
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