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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include "errno-util.h"
#include "format-util.h"
#include "log.h"
#include "procfs-util.h"
#include "process-util.h"
#include "tests.h"
int main(int argc, char *argv[]) {
nsec_t nsec;
uint64_t v, w;
int r;
log_parse_environment();
log_open();
assert_se(procfs_cpu_get_usage(&nsec) >= 0);
log_info("Current system CPU time: %s", FORMAT_TIMESPAN(nsec/NSEC_PER_USEC, 1));
assert_se(procfs_memory_get_used(&v) >= 0);
log_info("Current memory usage: %s", FORMAT_BYTES(v));
assert_se(procfs_tasks_get_current(&v) >= 0);
log_info("Current number of tasks: %" PRIu64, v);
v = TASKS_MAX;
r = procfs_get_pid_max(&v);
assert(r >= 0 || r == -ENOENT || ERRNO_IS_PRIVILEGE(r));
log_info("kernel.pid_max: %"PRIu64, v);
w = TASKS_MAX;
r = procfs_get_threads_max(&w);
assert(r >= 0 || r == -ENOENT || ERRNO_IS_PRIVILEGE(r));
log_info("kernel.threads-max: %"PRIu64, w);
v = MIN(v - (v > 0), w);
assert_se(r >= 0);
log_info("Limit of tasks: %" PRIu64, v);
assert_se(v > 0);
r = procfs_tasks_set_limit(v);
if (r == -ENOENT || ERRNO_IS_PRIVILEGE(r))
return log_tests_skipped("can't set task limits");
assert(r >= 0);
if (v > 100) {
log_info("Reducing limit by one to %"PRIu64"…", v-1);
r = procfs_tasks_set_limit(v-1);
log_info_errno(r, "procfs_tasks_set_limit: %m");
assert_se(r >= 0 || ERRNO_IS_PRIVILEGE(r) || r == -EROFS);
assert_se(procfs_get_threads_max(&w) >= 0);
assert_se(r >= 0 ? w == v - 1 : w == v);
assert_se(procfs_tasks_set_limit(v) >= 0);
assert_se(procfs_get_threads_max(&w) >= 0);
assert_se(v == w);
}
return 0;
}
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