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