ngx_write_chain_to_file  127 src/core/ngx_file.c     return ngx_write_chain_to_file(&tf->file, chain, tf->offset, tf->pool);
ngx_write_chain_to_file  132 src/os/unix/ngx_files.h ssize_t ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *ce,