ngx_recv_chain_pt  115 core/ngx_connection.h     ngx_recv_chain_pt   recv_chain;
ngx_recv_chain_pt   19 os/unix/ngx_os.h typedef ssize_t (*ngx_recv_chain_pt)(ngx_connection_t *c, ngx_chain_t *in);
ngx_recv_chain_pt   26 os/unix/ngx_os.h     ngx_recv_chain_pt  recv_chain;