NGX_IOVS          148 os/unix/ngx_files.c #define NGX_IOVS  8
NGX_IOVS           12 os/unix/ngx_readv_chain.c #define NGX_IOVS  16
NGX_IOVS           13 os/unix/ngx_writev_chain.c #define NGX_IOVS  64
NGX_IOVS           15 os/unix/ngx_writev_chain.c #define NGX_IOVS  IOV_MAX