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78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include "errno-util.h"
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#include "format-util.h"
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#include "log.h"
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#include "procfs-util.h"
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#include "process-util.h"
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#include "tests.h"
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int main(int argc, char *argv[]) {
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nsec_t nsec;
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uint64_t v, pid_max, threads_max, limit;
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int r;
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log_parse_environment();
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log_open();
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assert_se(procfs_cpu_get_usage(&nsec) >= 0);
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log_info("Current system CPU time: %s", FORMAT_TIMESPAN(nsec/NSEC_PER_USEC, 1));
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assert_se(procfs_memory_get_used(&v) >= 0);
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log_info("Current memory usage: %s", FORMAT_BYTES(v));
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assert_se(procfs_tasks_get_current(&v) >= 0);
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log_info("Current number of tasks: %" PRIu64, v);
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pid_max = TASKS_MAX;
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r = procfs_get_pid_max(&pid_max);
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if (r == -ENOENT || ERRNO_IS_NEG_PRIVILEGE(r))
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return log_tests_skipped_errno(r, "can't get pid max");
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assert(r >= 0);
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log_info("kernel.pid_max: %"PRIu64, pid_max);
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threads_max = TASKS_MAX;
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r = procfs_get_threads_max(&threads_max);
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if (r == -ENOENT || ERRNO_IS_NEG_PRIVILEGE(r))
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return log_tests_skipped_errno(r, "can't get threads max");
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assert(r >= 0);
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log_info("kernel.threads-max: %"PRIu64, threads_max);
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limit = MIN(pid_max - (pid_max > 0), threads_max);
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assert_se(r >= 0);
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log_info("Limit of tasks: %" PRIu64, limit);
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assert_se(limit > 0);
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/* This call should never fail, as we're trying to set it to the same limit */
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assert(procfs_tasks_set_limit(limit) >= 0);
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if (limit > 100) {
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log_info("Reducing limit by one to %"PRIu64"…", limit-1);
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r = procfs_tasks_set_limit(limit-1);
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if (IN_SET(r, -ENOENT, -EROFS) || ERRNO_IS_PRIVILEGE(r))
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return log_tests_skipped_errno(r, "can't set tasks limit");
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assert_se(r >= 0);
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assert_se(procfs_get_pid_max(&v) >= 0);
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/* We never decrease the pid_max, so it shouldn't have changed */
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assert_se(v == pid_max);
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assert_se(procfs_get_threads_max(&v) >= 0);
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assert_se(v == limit-1);
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assert_se(procfs_tasks_set_limit(limit) >= 0);
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assert_se(procfs_get_pid_max(&v) >= 0);
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assert_se(v == pid_max);
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assert_se(procfs_get_threads_max(&v) >= 0);
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assert_se(v == limit);
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}
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return 0;
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}
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