S_ISDIR           154 os/unix/ngx_files.h #define ngx_is_dir(sb)           (S_ISDIR((sb)->st_mode))
S_ISDIR           239 os/unix/ngx_files.h     (((dir)->type) ? ((dir)->type == DT_DIR) : (S_ISDIR((dir)->info.st_mode)))
S_ISDIR           247 os/unix/ngx_files.h #define ngx_de_is_dir(dir)       (S_ISDIR((dir)->info.st_mode))