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/*
* Copyright (C) 2014-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-limit.h"
typedef struct {
const shim_rlimit_resource_t resource; /* RLIMIT_* resource */
const char *opt; /* stress-ng option to control resource */
} stress_rlimit_t;
static const stress_rlimit_t limits[] = {
#if defined(RLIMIT_AS)
{ RLIMIT_AS, "limit-as" },
#endif
#if defined(RLIMIT_CPU)
{ RLIMIT_CPU, NULL },
#endif
#if defined(RLIMIT_DATA)
{ RLIMIT_DATA, "limit-data" },
#endif
#if defined(RLIMIT_FSIZE)
{ RLIMIT_FSIZE, NULL },
#endif
#if defined(RLIMIT_LOCKS)
{ RLIMIT_LOCKS, NULL },
#endif
#if defined(RLIMIT_MEMLOCK)
{ RLIMIT_MEMLOCK, NULL },
#endif
#if defined(RLIMIT_MSGQUEUE)
{ RLIMIT_MSGQUEUE, NULL },
#endif
#if defined(RLIMIT_NICE)
{ RLIMIT_NICE, NULL },
#endif
#if defined(RLIMIT_NOFILE)
{ RLIMIT_NOFILE, NULL },
#endif
#if defined(RLIMIT_NPROC)
{ RLIMIT_NPROC, NULL },
#endif
#if defined(RLIMIT_RSS)
{ RLIMIT_RSS, NULL },
#endif
#if defined(RLIMIT_RTPRIO)
{ RLIMIT_RTPRIO, NULL },
#endif
#if defined(RLIMIT_RTTIME)
{ RLIMIT_RTTIME, NULL },
#endif
#if defined(RLIMIT_SIGPENDING)
{ RLIMIT_SIGPENDING, NULL },
#endif
#if defined(RLIMIT_STACK)
{ RLIMIT_STACK, "limit-stack" },
#endif
};
static void stress_set_limit(int resource, const char *opt)
{
struct rlimit rlim;
uint64_t val = 0;
/* User optional override for a specific limit? */
if (opt && stress_get_setting(opt, &val) && (val > 0)) {
rlim.rlim_cur = (rlim_t)val;
rlim.rlim_max = (rlim_t)val;
(void)setrlimit(resource, &rlim);
return;
}
if (UNLIKELY(getrlimit(resource, &rlim) < 0))
return;
rlim.rlim_cur = rlim.rlim_max;
(void)setrlimit(resource, &rlim);
}
/*
* stress_set_max_limits()
* push rlimits to maximum values allowed
* so we can stress a system to the maximum,
* we ignore any rlimit errors.
*/
void stress_set_max_limits(void)
{
size_t i;
struct rlimit rlim;
for (i = 0; i < SIZEOF_ARRAY(limits); i++)
stress_set_limit(limits[i].resource, limits[i].opt);
#if defined(RLIMIT_NOFILE)
{
uint64_t max_fd = 0;
(void)stress_get_setting("max-fd", &max_fd);
if (max_fd != 0) {
rlim.rlim_cur = (rlim_t)max_fd + 1;
rlim.rlim_max = (rlim_t)max_fd + 1;
(void)setrlimit(RLIMIT_NOFILE, &rlim);
}
}
#endif
}
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