ngx_chain_get_free_buf  156 core/ngx_buf.h ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free);
ngx_chain_get_free_buf  436 http/modules/ngx_http_memcached_module.c     cl = ngx_chain_get_free_buf(ctx->request->pool, &u->free_bufs);
ngx_chain_get_free_buf 2490 http/ngx_http_upstream.c     cl = ngx_chain_get_free_buf(r->pool, &u->free_bufs);