Function wait_for_tree_pids

tests/test_subprocess.c:281–304

}

static bool wait_for_tree_pids(const char *path, cbm_subprocess_t *process, pid_t *parent_pid,
                               pid_t *grandchild_pid, int timeout_ms) {
    uint64_t deadline = cbm_now_ms() + (uint64_t)timeout_ms;
    do {
        FILE *f = fopen(path, "r");
        if (f) {
            long parent_value = 0;
            long grandchild_value = 0;
            int fields = fscanf(f, "%ld %ld", &parent_value, &grandchild_value);
            fclose(f);
            if (fields == 2 && parent_value > 1 && grandchild_value > 1) {
                *parent_pid = (pid_t)parent_value;
                *grandchild_pid = (pid_t)grandchild_value;
                return true;
            }
        }
        cbm_proc_result_t ignored;
        if (cbm_subprocess_poll(process, &ignored) != CBM_PROC_POLL_RUNNING) {
            return false;
        }
        subprocess_test_pause();
    } while (cbm_now_ms() < deadline);
    return false;
}

static bool wait_pid_gone(pid_t pid, int timeout_ms) {
    uint64_t deadline = cbm_now_ms() + (uint64_t)timeout_ms;