2e4f7510d9
watchdog might hide the succesful arming of an earlier one. Accept that on failing to arm any watchdog (because of non-supported timeouts) EOPNOTSUPP is returned instead of the more appropriate EINVAL. MFC after: 3 days
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*-
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* Copyright (c) 2004 Poul-Henning Kamp
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* All rights reserved.
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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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* in this position and unchanged.
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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 AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/watchdog.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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static struct cdev *wd_dev;
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static int
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wd_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
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int flags __unused, struct thread *td)
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{
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int error;
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u_int u;
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if (cmd != WDIOCPATPAT)
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return (ENOIOCTL);
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u = *(u_int *)data;
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if (u & ~(WD_ACTIVE | WD_PASSIVE | WD_INTERVAL))
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return (EINVAL);
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if ((u & (WD_ACTIVE | WD_PASSIVE)) == (WD_ACTIVE | WD_PASSIVE))
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return (EINVAL);
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if ((u & (WD_ACTIVE | WD_PASSIVE)) == 0 && (u & WD_INTERVAL) > 0)
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return (EINVAL);
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if (u & WD_PASSIVE)
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return (ENOSYS); /* XXX Not implemented yet */
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if ((u & WD_INTERVAL) == WD_TO_NEVER) {
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u = 0;
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/* Assume all is well; watchdog signals failure. */
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error = 0;
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} else {
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/* Assume no watchdog available; watchdog flags success */
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error = EOPNOTSUPP;
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}
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EVENTHANDLER_INVOKE(watchdog_list, u, &error);
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return (error);
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}
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static struct cdevsw wd_cdevsw = {
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.d_version = D_VERSION,
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.d_ioctl = wd_ioctl,
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.d_name = "watchdog",
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};
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static int
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watchdog_modevent(module_t mod __unused, int type, void *data __unused)
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{
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switch(type) {
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case MOD_LOAD:
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wd_dev = make_dev(&wd_cdevsw, 0,
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UID_ROOT, GID_WHEEL, 0600, _PATH_WATCHDOG);
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return 0;
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case MOD_UNLOAD:
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destroy_dev(wd_dev);
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return 0;
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case MOD_SHUTDOWN:
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return 0;
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default:
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return EOPNOTSUPP;
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}
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}
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DEV_MODULE(watchdog, watchdog_modevent, NULL);
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