WEXITSTATUS       533 os/unix/ngx_process.c                           process, pid, WEXITSTATUS(status));
WEXITSTATUS       536 os/unix/ngx_process.c         if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
WEXITSTATUS       540 os/unix/ngx_process.c                           process, pid, WEXITSTATUS(status));