146 lines
3.0 KiB
C
146 lines
3.0 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*%% (c) Copyright 1993, 1994 Hewlett-Packard Company */
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/*%% (c) Copyright 1993, 1994 International Business Machines Corp. */
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/*%% (c) Copyright 1993, 1994 Sun Microsystems, Inc. */
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/*%% (c) Copyright 1993, 1994 Novell, Inc. */
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/*%% $XConsortium: isfcbwatchfd.c /main/3 1995/10/23 11:38:51 rswiston $ */
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* isfcbwatchfd.c
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*
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* Description:
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* Watch the limit on UNIX file descriptors used by the FCB module.
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*/
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#if defined(_AIX)
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#define _POSIX_SYSCONF
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#endif
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#if defined(_AIX)
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#define _POSIX_SYSCONF
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#endif
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#include "isam_impl.h"
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#include <sys/time.h>
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#include <sys/resource.h>
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#ifdef _POSIX_SYSCONF
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#include <unistd.h>
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#endif /* _POSIX_SYSCONF */
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static int _limit = MAXFCB_UNIXFD; /* Imposed limit */
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static int _in_use = 0; /* Current number of
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* open file descriptors
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*/
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/*
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* _watchfd_incr(n)
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*
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* Register that n additional UNIX file descriptors were open.
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*
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* Return the new number of open file descriptors.
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*/
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int
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_watchfd_incr(int n)
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{
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_in_use += n;
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assert(_in_use <= _limit);
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return (_in_use);
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}
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/*
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* _watch_decr(n)
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*
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* Register that n open file descriptors were closed.
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*
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* Return the new number of open file descriptors.
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*/
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int
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_watchfd_decr(int n)
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{
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_in_use -= n;
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assert(_in_use >= 0);
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return (_in_use);
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}
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/*
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* _watch_check()
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*
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* Return number of fd that are still available.
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*/
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int
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_watchfd_check(void)
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{
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return (_limit - _in_use);
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}
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/*
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* _watchfd_max_set(n)
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*
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* Set the maximum number of UNIX fds that may be comsumed by ISAM files.
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*/
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int
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_watchfd_max_set(int n)
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{
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int oldlimit = _limit;
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#ifdef _POSIX_SYSCONF
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if (n < 3 || n > sysconf(_SC_OPEN_MAX)) {
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#else
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int dtab_size = 0;
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struct rlimit rl;
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if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
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dtab_size = rl.rlim_cur;
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if (n < 3 || n > dtab_size) {
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#endif
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_setiserrno2(EBADARG, '9', '0');
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return (ISERROR);
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}
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_limit = n;
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return (oldlimit);
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}
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/*
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* _watchfd_max_get()
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*
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* Get the maximum number of UNIX fds that may be comsumed by ISAM files.
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*/
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int
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_watchfd_max_get(void)
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{
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return (_limit);
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}
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