| /* 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, pid_max, threads_max, limit; |
| 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); |
| |
| pid_max = TASKS_MAX; |
| r = procfs_get_pid_max(&pid_max); |
| if (r == -ENOENT || ERRNO_IS_PRIVILEGE(r)) |
| return log_tests_skipped_errno(r, "can't get pid max"); |
| assert(r >= 0); |
| log_info("kernel.pid_max: %"PRIu64, pid_max); |
| |
| threads_max = TASKS_MAX; |
| r = procfs_get_threads_max(&threads_max); |
| if (r == -ENOENT || ERRNO_IS_PRIVILEGE(r)) |
| return log_tests_skipped_errno(r, "can't get threads max"); |
| assert(r >= 0); |
| log_info("kernel.threads-max: %"PRIu64, threads_max); |
| |
| limit = MIN(pid_max - (pid_max > 0), threads_max); |
| |
| assert_se(r >= 0); |
| log_info("Limit of tasks: %" PRIu64, limit); |
| assert_se(limit > 0); |
| |
| /* This call should never fail, as we're trying to set it to the same limit */ |
| assert(procfs_tasks_set_limit(limit) >= 0); |
| |
| if (limit > 100) { |
| log_info("Reducing limit by one to %"PRIu64"…", limit-1); |
| |
| r = procfs_tasks_set_limit(limit-1); |
| if (IN_SET(r, -ENOENT, -EROFS) || ERRNO_IS_PRIVILEGE(r)) |
| return log_tests_skipped_errno(r, "can't set tasks limit"); |
| assert_se(r >= 0); |
| |
| assert_se(procfs_get_pid_max(&v) >= 0); |
| /* We never decrease the pid_max, so it shouldn't have changed */ |
| assert_se(v == pid_max); |
| |
| assert_se(procfs_get_threads_max(&v) >= 0); |
| assert_se(v == limit-1); |
| |
| assert_se(procfs_tasks_set_limit(limit) >= 0); |
| |
| assert_se(procfs_get_pid_max(&v) >= 0); |
| assert_se(v == pid_max); |
| |
| assert_se(procfs_get_threads_max(&v) >= 0); |
| assert_se(v == limit); |
| } |
| |
| return 0; |
| } |