245 lines
6.2 KiB
C
245 lines
6.2 KiB
C
/* $NetBSD: kern_subr.c,v 1.17 1996/11/24 00:42:31 cgd Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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int
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uiomove(buf, n, uio)
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register void *buf;
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register int n;
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register struct uio *uio;
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{
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register struct iovec *iov;
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u_int cnt;
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int error = 0;
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char *cp = buf;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
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panic("uiomove: mode");
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if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
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panic("uiomove proc");
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#endif
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while (n > 0 && uio->uio_resid) {
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iov = uio->uio_iov;
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cnt = iov->iov_len;
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if (cnt == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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if (cnt > n)
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cnt = n;
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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if (uio->uio_rw == UIO_READ)
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error = copyout(cp, iov->iov_base, cnt);
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else
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error = copyin(iov->iov_base, cp, cnt);
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if (error)
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return (error);
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break;
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case UIO_SYSSPACE:
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if (uio->uio_rw == UIO_READ)
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bcopy(cp, iov->iov_base, cnt);
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else
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bcopy(iov->iov_base, cp, cnt);
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break;
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}
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iov->iov_base += cnt;
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iov->iov_len -= cnt;
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uio->uio_resid -= cnt;
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uio->uio_offset += cnt;
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cp += cnt;
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n -= cnt;
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}
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return (error);
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}
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/*
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* Give next character to user as result of read.
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*/
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int
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ureadc(c, uio)
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register int c;
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register struct uio *uio;
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{
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register struct iovec *iov;
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if (uio->uio_resid <= 0)
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panic("ureadc: non-positive resid");
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again:
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if (uio->uio_iovcnt <= 0)
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panic("ureadc: non-positive iovcnt");
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iov = uio->uio_iov;
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if (iov->iov_len <= 0) {
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uio->uio_iovcnt--;
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uio->uio_iov++;
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goto again;
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}
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switch (uio->uio_segflg) {
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case UIO_USERSPACE:
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if (subyte(iov->iov_base, c) < 0)
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return (EFAULT);
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break;
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case UIO_SYSSPACE:
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*iov->iov_base = c;
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break;
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}
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iov->iov_base++;
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iov->iov_len--;
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uio->uio_resid--;
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uio->uio_offset++;
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return (0);
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}
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/*
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* General routine to allocate a hash table.
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*/
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void *
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hashinit(elements, type, hashmask)
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int elements, type;
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u_long *hashmask;
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{
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long hashsize;
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LIST_HEAD(generic, generic) *hashtbl;
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int i;
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if (elements <= 0)
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panic("hashinit: bad cnt");
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for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
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continue;
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hashsize >>= 1;
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hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
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for (i = 0; i < hashsize; i++)
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LIST_INIT(&hashtbl[i]);
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*hashmask = hashsize - 1;
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return (hashtbl);
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}
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/*
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* "Shutdown hook" types, functions, and variables.
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*/
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struct shutdownhook_desc {
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LIST_ENTRY(shutdownhook_desc) sfd_list;
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void (*sfd_fn) __P((void *));
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void *sfd_arg;
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};
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LIST_HEAD(, shutdownhook_desc) shutdownhook_list;
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void *
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shutdownhook_establish(fn, arg)
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void (*fn) __P((void *));
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void *arg;
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{
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struct shutdownhook_desc *ndp;
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ndp = (struct shutdownhook_desc *)
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malloc(sizeof (*ndp), M_DEVBUF, M_NOWAIT);
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if (ndp == NULL)
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return NULL;
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ndp->sfd_fn = fn;
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ndp->sfd_arg = arg;
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LIST_INSERT_HEAD(&shutdownhook_list, ndp, sfd_list);
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return (ndp);
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}
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void
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shutdownhook_disestablish(vhook)
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void *vhook;
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{
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#ifdef DIAGNOSTIC
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struct shutdownhook_desc *dp;
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for (dp = shutdownhook_list.lh_first; dp != NULL;
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dp = dp->sfd_list.le_next)
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if (dp == vhook)
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break;
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if (dp == NULL)
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panic("shutdownhook_disestablish: hook not established");
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#endif
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LIST_REMOVE((struct shutdownhook_desc *)vhook, sfd_list);
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free(vhook, M_DEVBUF);
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}
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/*
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* Run shutdown hooks. Should be invoked immediately before the
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* system is halted or rebooted, i.e. after file systems unmounted,
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* after crash dump done, etc.
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*
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* Each shutdown hook is removed from the list before it's run, so that
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* it won't be run again.
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*/
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void
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doshutdownhooks()
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{
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struct shutdownhook_desc *dp;
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while ((dp = shutdownhook_list.lh_first) != NULL) {
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LIST_REMOVE(dp, sfd_list);
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(*dp->sfd_fn)(dp->sfd_arg);
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#if 0
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/*
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* Don't bother freeing the hook structure,, since we may
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* be rebooting because of a memory corruption problem,
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* and this might only make things worse. It doesn't
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* matter, anyway, since the system is just about to
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* reboot.
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*/
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free(dp, M_DEVBUF);
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#endif
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}
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}
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