mirror of
https://github.com/monitoring-plugins/monitoring-plugins.git
synced 2026-02-03 18:49:29 -05:00
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*****************************************************************************
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*
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* License: GPL
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* Copyright (c) 2024 Monitoring Plugins Development Team
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*****************************************************************************/
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#include "./maxfd.h"
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long mp_open_max(void) {
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long maxfd = 0L;
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/* Try sysconf(_SC_OPEN_MAX) first, as it can be higher than OPEN_MAX.
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* If that fails and the macro isn't defined, we fall back to an educated
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* guess. There's no guarantee that our guess is adequate and the program
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* will die with SIGSEGV if it isn't and the upper boundary is breached. */
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#ifdef _SC_OPEN_MAX
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errno = 0;
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if ((maxfd = sysconf(_SC_OPEN_MAX)) < 0) {
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if (errno == 0) {
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maxfd = DEFAULT_MAXFD; /* it's indeterminate */
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} else {
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die(STATE_UNKNOWN, _("sysconf error for _SC_OPEN_MAX\n"));
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}
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}
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#elif defined(OPEN_MAX)
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return OPEN_MAX
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#else /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
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return DEFAULT_MAXFD;
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#endif
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return (maxfd);
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}
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