a5bdcb2a2f
in the two consumers that need it.. processes using AIO and netncp. Update docs. Say that process_exec is called with Giant, but not to depend on it. All our consumers can handle it without Giant.
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
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* Copyright (c) 1999, 2000, 2001 Boris Popov
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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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* 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 Boris Popov.
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* 4. Neither the name of the author nor the names of any co-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 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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#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/errno.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <netncp/ncp.h>
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#include <netncp/ncp_conn.h>
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#include <netncp/ncp_sock.h>
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#include <netncp/ncp_subr.h>
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#include <netncp/ncp_rq.h>
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#include <netncp/ncp_ncp.h>
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#include <netncp/nwerror.h>
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int ncp_debuglevel = 0;
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struct callout_handle ncp_timer_handle;
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static eventhandler_tag ncp_exit_tag;
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static void ncp_at_exit(void *arg, struct proc *p);
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static void ncp_timer(void *arg);
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/*
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* duplicate string from user space. It should be very-very slow.
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*/
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char *
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ncp_str_dup(char *s) {
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char *p, bt;
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int len = 0;
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for (p = s;;p++) {
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if (copyin(p, &bt, 1)) return NULL;
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len++;
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if (bt == 0) break;
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}
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MALLOC(p, char*, len, M_NCPDATA, M_WAITOK);
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copyin(s, p, len);
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return p;
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}
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void
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ncp_at_exit(void *arg, struct proc *p)
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{
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struct ncp_conn *ncp, *nncp;
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struct thread *td;
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mtx_lock(&Giant);
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FOREACH_THREAD_IN_PROC(p, td) {
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if (ncp_conn_putprochandles(td) == 0)
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continue;
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ncp_conn_locklist(LK_EXCLUSIVE, td);
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for (ncp = SLIST_FIRST(&conn_list); ncp; ncp = nncp) {
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nncp = SLIST_NEXT(ncp, nc_next);
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if (ncp_conn_lock(ncp, td, td->td_ucred,
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NCPM_READ | NCPM_EXECUTE | NCPM_WRITE))
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continue;
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if (ncp_conn_free(ncp) != 0)
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ncp_conn_unlock(ncp, td);
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}
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ncp_conn_unlocklist(td);
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}
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mtx_unlock(&Giant);
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}
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int
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ncp_init(void)
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{
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ncp_conn_init();
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ncp_exit_tag = EVENTHANDLER_REGISTER(process_exit, ncp_at_exit, NULL,
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EVENTHANDLER_PRI_ANY);
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ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
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return 0;
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}
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int
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ncp_done(void)
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{
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int error;
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error = ncp_conn_destroy();
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if (error)
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return error;
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untimeout(ncp_timer, NULL, ncp_timer_handle);
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EVENTHANDLER_DEREGISTER(process_exit, ncp_exit_tag);
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return 0;
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}
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/* tick every second and check for watch dog packets and lost connections */
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static void
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ncp_timer(void *arg)
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{
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struct ncp_conn *conn;
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if(ncp_conn_locklist(LK_SHARED | LK_NOWAIT, NULL) == 0) {
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SLIST_FOREACH(conn, &conn_list, nc_next)
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ncp_check_conn(conn);
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ncp_conn_unlocklist(NULL);
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}
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ncp_timer_handle = timeout(ncp_timer, NULL, NCP_TIMER_TICK);
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}
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