gctl_set_param
int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len);
switch (gctl_set_param(req, param, ptr, len)) {
gctl_set_param(req, "output", buf, 0);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);
gctl_set_param(req, "output", sbuf_data(sb), sbuf_len(sb) + 1);