writer.c

#include "uwsgi.h"

extern struct uwsgi_server uwsgi;

int uwsgi_response_add_content_length(struct wsgi_request *wsgi_req, uint64_t cl) {
	char buf[sizeof(UMAX64_STR)+1];
        int ret = snprintf(buf, sizeof(UMAX64_STR)+1, "%llu", (unsigned long long) cl);
        if (ret <= 0 || ret >= (int) (sizeof(UMAX64_STR)+1)) {
		wsgi_req->write_errors++;
                return -1;
        }
	return uwsgi_response_add_header(wsgi_req, "Content-Length", 14, buf, ret); 
}

int uwsgi_response_add_expires(struct wsgi_request *wsgi_req, uint64_t t) {
	// 30+1
        char expires[31];
	int len = uwsgi_http_date((time_t) t, expires);
	if (!len) {
		wsgi_req->write_errors++;
                return -1;
        }
	return uwsgi_response_add_header(wsgi_req, "Expires", 7, expires, len); 
}

int uwsgi_response_add_date(struct wsgi_request *wsgi_req, char *hkey, uint16_t hlen, uint64_t t) {
        // 30+1
        char d[31];
        int len = uwsgi_http_date((time_t) t, d);
        if (!len) {
                wsgi_req->write_errors++;
                return -1;
        }
        return uwsgi_response_add_header(wsgi_req, hkey, hlen, d, len);
}

int uwsgi_response_add_last_modified(struct wsgi_request *wsgi_req, uint64_t t) {
        // 30+1
        char lm[31];
        int len = uwsgi_http_date((time_t) t, lm);
        if (!len) {
                wsgi_req->write_errors++;
                return -1;
        }
        return uwsgi_response_add_header(wsgi_req, "Last-Modified", 13, lm, len);
}

int uwsgi_response_add_content_range(struct wsgi_request *wsgi_req, int64_t start, int64_t end, int64_t cl) {
        char buf[6+(sizeof(UMAX64_STR)*3)+4];
	int ret = -1;
	if (start == -1 && end == -1 && cl >= 0) {
		ret = snprintf(buf, sizeof(buf), "bytes */%lld", (long long) cl);
	}
	else if (start < 0 || end < start || end >= cl) {
		uwsgi_log("uwsgi_response_add_content_range is called with wrong arguments:"
				"start=%lld end=%lld content-length=%lld\n",
				start, end, cl);
		wsgi_req->write_errors++;
		return -1;
	}
	else {
		ret = snprintf(buf, sizeof(buf), "bytes %lld-%lld/%lld", (long long) start, (long long) end, (long long) cl);
	}
        if (ret <= 0 || ret >= (int) (6+(sizeof(UMAX64_STR)*3)+4)) {
                wsgi_req->write_errors++;
                return -1;
        }
        return uwsgi_response_add_header(wsgi_req, "Content-Range", 13, buf, ret);
}

int uwsgi_response_prepare_headers_int(struct wsgi_request *wsgi_req, int status) {
	char status_str[11];
	uwsgi_num2str2(status, status_str);
	return uwsgi_response_prepare_headers(wsgi_req, status_str, 3);
}

// status could be NNN or NNN message
int uwsgi_response_prepare_headers(struct wsgi_request *wsgi_req, char *status, uint16_t status_len) {

	if (wsgi_req->headers_sent || wsgi_req->headers_size || wsgi_req->response_size || status_len < 3 || wsgi_req->write_errors) return -1;

	if (!wsgi_req->headers) {
		wsgi_req->headers = uwsgi_buffer_new(uwsgi.page_size);
		wsgi_req->headers->limit = uwsgi.response_header_limit;
	}

	// reset the buffer (could be useful for rollbacks...)
	wsgi_req->headers->pos = 0;
	// reset headers count
	wsgi_req->header_cnt = 0;
	struct uwsgi_buffer *hh = NULL;
	wsgi_req->status = uwsgi_str3_num(status);
#ifdef UWSGI_ROUTING
	// apply error routes
	if (wsgi_req->is_error_routing == 0) {
		if (uwsgi_apply_error_routes(wsgi_req) == UWSGI_ROUTE_BREAK) {
			// from now on ignore write body requests...
			wsgi_req->ignore_body = 1;
			return -1;
		}
		wsgi_req->is_error_routing = 0;
	}
#endif
	if (status_len <= 4) {
		char *new_sc = NULL;
		size_t new_sc_len = 0;
		uint16_t sc_len = 0;
		const char *sc = uwsgi_http_status_msg(status, &sc_len);
		if (sc) {
			new_sc = uwsgi_concat3n(status, 3, " ", 1, (char *)sc, sc_len);
			new_sc_len = 4+sc_len;
		}
		else {	
			new_sc = uwsgi_concat2n(status, 3, " Unknown", 8);
			new_sc_len = 11;
		}
		hh = wsgi_req->socket->proto_prepare_headers(wsgi_req, new_sc, new_sc_len);
		free(new_sc);
	}
	else {
		hh = wsgi_req->socket->proto_prepare_headers(wsgi_req, status, status_len);
	}
	if (!hh) {wsgi_req->write_errors++; return -1;}
        if (uwsgi_buffer_append(wsgi_req->headers, hh->buf, hh->pos)) goto error;
        uwsgi_buffer_destroy(hh);
        return 0;
error:
        uwsgi_buffer_destroy(hh);
	wsgi_req->write_errors++;
	return -1;
}

//each protocol has its header generator
static int uwsgi_response_add_header_do(struct wsgi_request *wsgi_req, char *key, uint16_t key_len, char *value, uint16_t value_len) {


	// pull/collect the header ?
	struct uwsgi_string_list *usl = NULL;

	uwsgi_foreach(usl, uwsgi.pull_headers) {
                if (!uwsgi_strnicmp(key, key_len, usl->value, usl->custom)) {
                        if (!uwsgi_req_append(wsgi_req, usl->custom_ptr, usl->custom2, value, value_len)) {
                                wsgi_req->write_errors++ ; return -1;
                        }
			return 0;
                }
        }

	uwsgi_foreach(usl, uwsgi.collect_headers) {
		if (!uwsgi_strnicmp(key, key_len, usl->value, usl->custom)) {
			if (!uwsgi_req_append(wsgi_req, usl->custom_ptr, usl->custom2, value, value_len)) {
				wsgi_req->write_errors++ ; return -1;
			}
		}
	}

        if (!wsgi_req->headers) {
                wsgi_req->headers = uwsgi_buffer_new(uwsgi.page_size);
                wsgi_req->headers->limit = uwsgi.response_header_limit;
        }

        struct uwsgi_buffer *hh = wsgi_req->socket->proto_add_header(wsgi_req, key, key_len, value, value_len);
        if (!hh) { wsgi_req->write_errors++ ; return -1;}
        if (uwsgi_buffer_append(wsgi_req->headers, hh->buf, hh->pos)) goto error;
        wsgi_req->header_cnt++;
        uwsgi_buffer_destroy(hh);
        return 0;
error:
        uwsgi_buffer_destroy(hh);
        wsgi_req->write_errors++;
        return -1;
}

int uwsgi_response_add_header(struct wsgi_request *wsgi_req, char *key, uint16_t key_len, char *value, uint16_t value_len) {

	if (wsgi_req->headers_sent || wsgi_req->headers_size || wsgi_req->response_size || wsgi_req->write_errors) return -1;

	struct uwsgi_string_list *rh = uwsgi.remove_headers;
	while(rh) {
		if (!uwsgi_strnicmp(key, key_len, rh->value, rh->len)) {
			return 0;
		}
		rh = rh->next;
	}
	rh = wsgi_req->remove_headers;
	while(rh) {
		if (!uwsgi_strnicmp(key, key_len, rh->value, rh->len)) {
			return 0;
		}
		rh = rh->next;
	}

	return uwsgi_response_add_header_do(wsgi_req, key, key_len, value, value_len);
}

int uwsgi_response_add_header_force(struct wsgi_request *wsgi_req, char *key, uint16_t key_len, char *value, uint16_t value_len) {

        if (wsgi_req->headers_sent || wsgi_req->headers_size || wsgi_req->response_size || wsgi_req->write_errors) return -1;

        return uwsgi_response_add_header_do(wsgi_req, key, key_len, value, value_len);
}

static int uwsgi_response_write_headers_do0(struct wsgi_request *wsgi_req) {
	if (wsgi_req->headers_sent || !wsgi_req->headers || wsgi_req->response_size || wsgi_req->write_errors) {
		return UWSGI_OK;
	}

#ifdef UWSGI_ROUTING
        // apply response routes
	if (wsgi_req->is_response_routing == 0) {
        	if (uwsgi_apply_response_routes(wsgi_req) == UWSGI_ROUTE_BREAK) {
                	// from now on ignore write body requests...
                	wsgi_req->ignore_body = 1;
                	return -1;
        	}
        	wsgi_req->is_response_routing = 0;
	}
#endif

	struct uwsgi_string_list *ah = uwsgi.additional_headers;
	while(ah) {
		if (uwsgi_response_add_header(wsgi_req, NULL, 0, ah->value, ah->len)) return -1;
                ah = ah->next;
        }

        ah = wsgi_req->additional_headers;
        while(ah) {
		if (uwsgi_response_add_header(wsgi_req, NULL, 0, ah->value, ah->len)) return -1;
                ah = ah->next;
        }


	if (wsgi_req->socket->proto_fix_headers(wsgi_req)) { wsgi_req->write_errors++ ; return -1;}

	return UWSGI_AGAIN;
}

int uwsgi_response_write_headers_do(struct wsgi_request *wsgi_req) {

	int ret = uwsgi_response_write_headers_do0(wsgi_req);
	if (ret != UWSGI_AGAIN) return ret;

	for(;;) {
		errno = 0;
                int ret = wsgi_req->socket->proto_write_headers(wsgi_req, wsgi_req->headers->buf, wsgi_req->headers->pos);
                if (ret < 0) {
                        if (!uwsgi.ignore_write_errors) {
                                uwsgi_req_error("uwsgi_response_write_headers_do()");
                        }
			wsgi_req->write_errors++;
                        return -1;
                }
                if (ret == UWSGI_OK) {
                        break;
                }
		if (!uwsgi_is_again()) continue;
                ret = uwsgi_wait_write_req(wsgi_req);
                if (ret < 0) { wsgi_req->write_errors++; return -1;}
                if (ret == 0) {
			uwsgi_log("uwsgi_response_write_headers_do() TIMEOUT !!!\n");
			wsgi_req->write_errors++;
			return -1;
		}
        }

        wsgi_req->headers_size += wsgi_req->write_pos;
	// reset for the next write
        wsgi_req->write_pos = 0;
	wsgi_req->headers_sent = 1;

        return UWSGI_OK;
}

/*
	private function for highly optimized writes (1 single syscall for headers and body)
*/
static int uwsgi_response_writev_headers_and_body_do(struct wsgi_request *wsgi_req, char *buf, size_t len) {

	struct iovec iov[2];

        int ret = uwsgi_response_write_headers_do0(wsgi_req);
        if (ret != UWSGI_AGAIN) return ret;

	iov[0].iov_base = wsgi_req->headers->buf;
	iov[0].iov_len = wsgi_req->headers->pos;
	iov[1].iov_base = buf;
	iov[1].iov_len = len;

	size_t iov_len = 2;
        for(;;) {
                errno = 0;
		// no need to use writev if a single iovec remains
		if (iov_len == 1) {
			buf = iov[0].iov_base;	
			len = iov[0].iov_len;
			// update counters
			wsgi_req->headers_size += wsgi_req->headers->pos;
			wsgi_req->headers_sent = 1;
			wsgi_req->response_size += wsgi_req->write_pos - wsgi_req->headers_size;
			wsgi_req->write_pos = 0;
			goto fallback;
		}
                int ret = wsgi_req->socket->proto_writev(wsgi_req, iov, &iov_len);
                if (ret < 0) {
                        if (!uwsgi.ignore_write_errors) {
                                uwsgi_req_error("uwsgi_response_writev_headers_and_body_do()");
                        }
                        wsgi_req->write_errors++;
                        return -1;
                }
                if (ret == UWSGI_OK) {
                        break;
                }
                if (!uwsgi_is_again()) continue;
                ret = uwsgi_wait_write_req(wsgi_req);
                if (ret < 0) { wsgi_req->write_errors++; return -1;}
                if (ret == 0) {
                        uwsgi_log("uwsgi_response_writev_headers_and_body_do() TIMEOUT !!!\n");
                        wsgi_req->write_errors++;
                        return -1;
                }
        }

	wsgi_req->headers_size += wsgi_req->headers->pos;
	wsgi_req->response_size += len;
	wsgi_req->headers_sent = 1;

	// reset for the next write
        wsgi_req->write_pos = 0;

        return UWSGI_OK;

fallback:

	for(;;) {
                errno = 0;
                int ret = wsgi_req->socket->proto_write(wsgi_req, buf, len);
                if (ret < 0) {
                        if (!uwsgi.ignore_write_errors) {
				// here we use the parent name
                                uwsgi_req_error("uwsgi_response_write_body_do()");
                        }
                        wsgi_req->write_errors++;
                        return -1;
                }
                if (ret == UWSGI_OK) {
                        break;
                }
                if (!uwsgi_is_again()) continue;
                ret = uwsgi_wait_write_req(wsgi_req);
                if (ret < 0) { wsgi_req->write_errors++; return -1;}
                if (ret == 0) {
			// here we use the parent name
                        uwsgi_log("uwsgi_response_write_body_do() TIMEOUT !!!\n");
                        wsgi_req->write_errors++;
                        return -1;
                }
        }

        wsgi_req->response_size += wsgi_req->write_pos;
        // reset for the next write
        wsgi_req->write_pos = 0;

        return UWSGI_OK;

}

// this is the function called by all request plugins to send chunks to the client
int uwsgi_response_write_body_do(struct wsgi_request *wsgi_req, char *buf, size_t len) {

	if (wsgi_req->write_errors) return -1;
	if (wsgi_req->ignore_body) return UWSGI_OK;

#ifdef UWSGI_ROUTING
	// special case here, we could need to set transformations before
	if (!wsgi_req->headers_sent) {
        	// apply response routes
		if (wsgi_req->is_response_routing == 0) {
        		if (uwsgi_apply_response_routes(wsgi_req) == UWSGI_ROUTE_BREAK) {
                		// from now on ignore write body requests...
                		wsgi_req->ignore_body = 1;
                		return -1;
        		}
        		wsgi_req->is_response_routing = 0;
		}
	}
#endif

	// if the transformation chain returns 1, we are in buffering mode
	if (wsgi_req->transformed_chunk_len == 0 && wsgi_req->transformations) {
		int t_ret = uwsgi_apply_transformations(wsgi_req, buf, len);
		if (t_ret == 0) {
			buf = wsgi_req->transformed_chunk;
			len = wsgi_req->transformed_chunk_len;
			// reset transformation
			wsgi_req->transformed_chunk = NULL;
			wsgi_req->transformed_chunk_len = 0;
			goto write;
		}
		if (t_ret == 1) {
			return UWSGI_OK;
		}
		wsgi_req->write_errors++;
		return -1;
	}

write:
	// send headers if not already sent
	if (!wsgi_req->headers_sent) {
		if (wsgi_req->socket->proto_writev && len > 0 && wsgi_req->headers) {
			return uwsgi_response_writev_headers_and_body_do(wsgi_req, buf, len);
		}
		int ret = uwsgi_response_write_headers_do(wsgi_req);
                if (ret == UWSGI_OK) goto sendbody;
                if (ret == UWSGI_AGAIN) return UWSGI_AGAIN;
		wsgi_req->write_errors++;
                return -1;
	}

sendbody:

	if (len == 0) return UWSGI_OK;
	
	for(;;) {
		errno = 0;
		int ret = wsgi_req->socket->proto_write(wsgi_req, buf, len);
		if (ret < 0) {
			if (!uwsgi.ignore_write_errors) {
				uwsgi_req_error("uwsgi_response_write_body_do()");
			}
			wsgi_req->write_errors++;
			return -1;
		}
		if (ret == UWSGI_OK) {
			break;
		}
		if (!uwsgi_is_again()) continue;
		ret = uwsgi_wait_write_req(wsgi_req);			
		if (ret < 0) { wsgi_req->write_errors++; return -1;}
                if (ret == 0) {
                        uwsgi_log("uwsgi_response_write_body_do() TIMEOUT !!!\n");
                        wsgi_req->write_errors++;
                        return -1;
                }
	}

	wsgi_req->response_size += wsgi_req->write_pos;
	// reset for the next write
        wsgi_req->write_pos = 0;

	return UWSGI_OK;	
}

int uwsgi_response_writev_body_do(struct wsgi_request *wsgi_req, struct iovec *iov, size_t len) {

        if (wsgi_req->write_errors) return -1;
        if (wsgi_req->ignore_body) return UWSGI_OK;

#ifdef UWSGI_ROUTING
        // special case here, we could need to set transformations before
        if (!wsgi_req->headers_sent) {
                // apply response routes
		if (wsgi_req->is_response_routing == 0) {
                	if (uwsgi_apply_response_routes(wsgi_req) == UWSGI_ROUTE_BREAK) {
                        	// from now on ignore write body requests...
                        	wsgi_req->ignore_body = 1;
                        	return -1;
                	}
                	wsgi_req->is_response_routing = 0;
		}
        }
#endif

	size_t i;
	int buffering = 0;
	// transformations apply to every vector
	for(i=0;i<len;i++) {	
        	// if the transformation chain returns 1, we are in buffering mode
        	if (wsgi_req->transformed_chunk_len == 0 && wsgi_req->transformations) {
                	int t_ret = uwsgi_apply_transformations(wsgi_req, iov[i].iov_base, iov[i].iov_len);
                	if (t_ret == 0) {
                        	iov[i].iov_base = wsgi_req->transformed_chunk;
                        	iov[i].iov_len = wsgi_req->transformed_chunk_len;
                        	// reset transformation
                        	wsgi_req->transformed_chunk = NULL;
                        	wsgi_req->transformed_chunk_len = 0;
                        	goto write;
                	}
                	if (t_ret == 1) {
				buffering = 1;
				continue;
                	}
                	wsgi_req->write_errors++;
                	return -1;
		}
        }

	if (buffering) return UWSGI_OK;

write:
        // send headers if not already sent
        if (!wsgi_req->headers_sent) {
                int ret = uwsgi_response_write_headers_do(wsgi_req);
                if (ret == UWSGI_OK) goto sendbody;
                if (ret == UWSGI_AGAIN) return UWSGI_AGAIN;
                wsgi_req->write_errors++;
                return -1;
        }

sendbody:

        if (len == 0) return UWSGI_OK;
	// unfortunately vector based I/O cannot be accomplished on all protocols
	if (!wsgi_req->socket->proto_writev) goto fallback;

	// we use a copy to avoid mess
	size_t iov_len = len;
	for(;;) {
        	errno = 0;
                int ret = wsgi_req->socket->proto_writev(wsgi_req, iov, &iov_len);
                if (ret < 0) {
                	if (!uwsgi.ignore_write_errors) {
                        	uwsgi_req_error("uwsgi_response_writev_body_do()");
                        }
                        wsgi_req->write_errors++;
                        return -1;
                }
                if (ret == UWSGI_OK) {
                	break;
                }
                if (!uwsgi_is_again()) continue;
                ret = uwsgi_wait_write_req(wsgi_req);
                if (ret < 0) { wsgi_req->write_errors++; return -1;}
                if (ret == 0) {
                	uwsgi_log("uwsgi_response_writev_body_do() TIMEOUT !!!\n");
                        wsgi_req->write_errors++;
                        return -1;
                }
	}

	goto done;

fallback:

	for(i=0;i<len;i++) {
        	for(;;) {
                	errno = 0;
                	int ret = wsgi_req->socket->proto_write(wsgi_req, iov[i].iov_base, iov[i].iov_len);
                	if (ret < 0) {
                        	if (!uwsgi.ignore_write_errors) {
                                	uwsgi_req_error("uwsgi_response_writev_body_do()");
                        	}
                        	wsgi_req->write_errors++;
                        	return -1;
                	}
                	if (ret == UWSGI_OK) {
                        	break;
                	}
                	if (!uwsgi_is_again()) continue;
                	ret = uwsgi_wait_write_req(wsgi_req);
                	if (ret < 0) { wsgi_req->write_errors++; return -1;}
                	if (ret == 0) {
                        	uwsgi_log("uwsgi_response_writev_body_do() TIMEOUT !!!\n");
                        	wsgi_req->write_errors++;
                        	return -1;
                	}
		}
        }

done:

        wsgi_req->response_size += wsgi_req->write_pos;
        // reset for the next write
        wsgi_req->write_pos = 0;

        return UWSGI_OK;
}


int uwsgi_response_sendfile_do(struct wsgi_request *wsgi_req, int fd, size_t pos, size_t len) {
	return uwsgi_response_sendfile_do_can_close(wsgi_req, fd, pos, len, 1);	
}

int uwsgi_response_sendfile_do_can_close(struct wsgi_request *wsgi_req, int fd, size_t pos, size_t len, int can_close) {

	if (fd == wsgi_req->sendfile_fd) can_close = 0;

	if (wsgi_req->write_errors) {
		if (can_close) close(fd);
		return -1;
	}

	if (wsgi_req->ignore_body) {
		if (can_close) close(fd);
		return UWSGI_OK;
	}

	if (!wsgi_req->headers_sent) {
		int ret = uwsgi_response_write_headers_do(wsgi_req);
		if (ret == UWSGI_OK) goto sendfile;
		if (ret == UWSGI_AGAIN) return UWSGI_AGAIN;
		wsgi_req->write_errors++;
		if (can_close) close(fd);
		return -1;
	}

sendfile:

	if (len == 0) {
		struct stat st;
		if (fstat(fd, &st)) {
			uwsgi_req_error("uwsgi_response_sendfile_do()/fstat()");
			wsgi_req->write_errors++;
			if (can_close) close(fd);
			return -1;
		}
		if (pos >= (size_t)st.st_size) {
			if (can_close) close(fd);
			return UWSGI_OK;
		}
		len = st.st_size;
	}

	if (wsgi_req->socket->can_offload) {
		// of we cannot close the socket (before the app will close it later)
		// let's dup it
		if (!can_close) {
			int tmp_fd = dup(fd);
			if (tmp_fd < 0) {
				uwsgi_req_error("uwsgi_response_sendfile_do()/dup()");
				wsgi_req->write_errors++;
				return -1;
			}
			fd = tmp_fd;
			can_close = 1;
		}
       		if (!uwsgi_offload_request_sendfile_do(wsgi_req, fd, len)) {
                	wsgi_req->via = UWSGI_VIA_OFFLOAD;
			wsgi_req->response_size += len;
                        return 0;
                }
		wsgi_req->write_errors++;
		if (can_close) close(fd);
		return -1;
	}


        wsgi_req->via = UWSGI_VIA_SENDFILE;

        for(;;) {
		errno = 0;
                int ret = wsgi_req->socket->proto_sendfile(wsgi_req, fd, pos, len);
                if (ret < 0) {
                        if (!uwsgi.ignore_write_errors) {
                                uwsgi_req_error("uwsgi_response_sendfile_do()");
                        }
			wsgi_req->write_errors++;
			if (can_close) close(fd);
                        return -1;
                }
                if (ret == UWSGI_OK) {
                        break;
                }
		if (!uwsgi_is_again()) continue;
                ret = uwsgi_wait_write_req(wsgi_req);
                if (ret < 0) {
			wsgi_req->write_errors++;
			if (can_close) close(fd);
			return -1;
		}
		if (ret == 0) {
                        uwsgi_log("uwsgi_response_sendfile_do() TIMEOUT !!!\n");
                        wsgi_req->write_errors++;
			if (can_close) close(fd);
                        return -1;
                }	
        }

        wsgi_req->response_size += wsgi_req->write_pos;
	// reset for the next write
        wsgi_req->write_pos = 0;
	// close the file descriptor
	if (can_close) close(fd);
        return UWSGI_OK;
}


int uwsgi_simple_wait_write_hook(int fd, int timeout) {
	struct pollfd upoll;
        timeout = timeout * 1000;

        upoll.fd = fd;
        upoll.events = POLLOUT;
        upoll.revents = 0;
        int ret = poll(&upoll, 1, timeout);

        if (ret > 0) {
                if (upoll.revents & POLLOUT) {
                        return 1;
                }
                return -1;
        }
        if (ret < 0) {
                uwsgi_error("uwsgi_simple_wait_write_hook()/poll()");
        }

        return ret;
}

/*
	simplified write to client
	(generally used as fallback)
*/
int uwsgi_simple_write(struct wsgi_request *wsgi_req, char *buf, size_t len) {

	wsgi_req->write_pos = 0;

	for(;;) {
		errno = 0;
                int ret = wsgi_req->socket->proto_write(wsgi_req, buf, len);
                if (ret < 0) {
                        if (!uwsgi.ignore_write_errors) {
                                uwsgi_req_error("uwsgi_simple_write()");
                        }
                        wsgi_req->write_errors++;
                        return -1;
                }
                if (ret == UWSGI_OK) {
                        break;
                }
		if (!uwsgi_is_again()) continue;
                ret = uwsgi_wait_write_req(wsgi_req);
                if (ret < 0) { wsgi_req->write_errors++; return -1;}
                if (ret == 0) {
                        uwsgi_log("uwsgi_simple_write() TIMEOUT !!!\n");
                        wsgi_req->write_errors++;
                        return -1;
                }
        }
        return 0;
}