NGX_FILE_TRUNCATE  987 core/ngx_cycle.c     create = ngx_test_config ? NGX_FILE_CREATE_OR_OPEN : NGX_FILE_TRUNCATE;
NGX_FILE_TRUNCATE  264 os/unix/ngx_files.c     fm->fd = ngx_open_file(fm->name, NGX_FILE_RDWR, NGX_FILE_TRUNCATE,