+ int ret = 0;
+ size_t written = 0;
+ size_t total = length;
+ ssize_t len;
+ off_t pos = offset;
+ char block[DSI_BLOCKSIZ];
+#ifdef HAVE_SENDFILEV
+ int sfvcnt;
+ struct sendfilevec vec[2];
+ ssize_t nwritten;
+#endif
+
+ LOG(log_maxdebug, logtype_dsi, "dsi_stream_read_file(off: %jd, len: %zu)", (intmax_t)offset, length);
+
+ if (dsi->flags & DSI_DISCONNECTED)
+ return -1;
+
+ dsi->in_write++;
+
+ dsi->flags |= DSI_NOREPLY;
+ dsi->header.dsi_flags = DSIFL_REPLY;
+ dsi->header.dsi_len = htonl(length);
+ dsi->header.dsi_code = htonl(err);
+ dsi_header_pack_reply(dsi, block);
+
+#ifdef HAVE_SENDFILEV
+ total += DSI_BLOCKSIZ;
+ sfvcnt = 2;
+ vec[0].sfv_fd = SFV_FD_SELF;
+ vec[0].sfv_flag = 0;
+ /* Cast to unsigned long to prevent sign extension of the
+ * pointer value for the LFS case; see Apache PR 39463. */
+ vec[0].sfv_off = (unsigned long)block;
+ vec[0].sfv_len = DSI_BLOCKSIZ;
+ vec[1].sfv_fd = fromfd;
+ vec[1].sfv_flag = 0;
+ vec[1].sfv_off = offset;
+ vec[1].sfv_len = length;
+#else
+ dsi_stream_write(dsi, block, sizeof(block), DSI_MSG_MORE);
+#endif
+
+ while (written < total) {
+#ifdef HAVE_SENDFILEV
+ nwritten = 0;
+ len = sendfilev(dsi->socket, vec, sfvcnt, &nwritten);
+#else
+ len = sys_sendfile(dsi->socket, fromfd, &pos, total - written);
+#endif
+ if (len < 0) {
+ switch (errno) {
+ case EINTR:
+ case EAGAIN:
+ len = 0;
+#ifdef HAVE_SENDFILEV
+ len = (size_t)nwritten;
+#else
+#if defined(SOLARIS) || defined(FREEBSD)
+ if (pos > offset) {
+ /* we actually have sent sth., adjust counters and keep trying */
+ len = pos - offset;
+ offset = pos;
+ }
+#endif /* defined(SOLARIS) || defined(FREEBSD) */
+#endif /* HAVE_SENDFILEV */
+
+ if (dsi_peek(dsi)) {
+ ret = -1;
+ goto exit;
+ }
+ break;
+ default:
+ LOG(log_error, logtype_dsi, "dsi_stream_read_file: %s", strerror(errno));
+ ret = -1;
+ goto exit;
+ }
+ } else if (len == 0) {
+ /* afpd is going to exit */
+ ret = -1;
+ goto exit;
+ }
+#ifdef HAVE_SENDFILEV
+ if (sfvcnt == 2 && len >= vec[0].sfv_len) {
+ vec[1].sfv_off += len - vec[0].sfv_len;
+ vec[1].sfv_len -= len - vec[0].sfv_len;
+
+ vec[0] = vec[1];
+ sfvcnt = 1;
+ } else {
+ vec[0].sfv_off += len;
+ vec[0].sfv_len -= len;
+ }
+#endif /* HAVE_SENDFILEV */
+ LOG(log_maxdebug, logtype_dsi, "dsi_stream_read_file: wrote: %zd", len);
+ written += len;
+ }
+#ifdef HAVE_SENDFILEV
+ written -= DSI_BLOCKSIZ;
+#endif
+ dsi->write_count += written;
+
+exit:
+ dsi->in_write--;
+ LOG(log_maxdebug, logtype_dsi, "dsi_stream_read_file: written: %zd", written);
+ if (ret != 0)
+ return -1;
+ return written;
+}
+#endif
+
+
+/*
+ * Essentially a loop around buf_read() to ensure "length" bytes are read
+ * from dsi->buffer and/or the socket.
+ *
+ * @returns length on success, some value smaller then length indicates an error
+ */
+size_t dsi_stream_read(DSI *dsi, void *data, const size_t length)
+{
+ size_t stored;
+ ssize_t len;
+
+ if (dsi->flags & DSI_DISCONNECTED)
+ return 0;
+
+ LOG(log_maxdebug, logtype_dsi, "dsi_stream_read(%u bytes)", length);
+
+ stored = 0;
+ while (stored < length) {
+ len = buf_read(dsi, (uint8_t *) data + stored, length - stored);
+ if (len == -1 && (errno == EINTR || errno == EAGAIN)) {
+ LOG(log_maxdebug, logtype_dsi, "dsi_stream_read: select read loop");
+ continue;
+ } else if (len > 0) {
+ stored += len;
+ } else { /* eof or error */
+ /* don't log EOF error if it's just after connect (OSX 10.3 probe) */
+#if 0
+ if (errno == ECONNRESET)
+ dsi->flags |= DSI_GOT_ECONNRESET;
+#endif
+ if (len || stored || dsi->read_count) {
+ if (! (dsi->flags & DSI_DISCONNECTED)) {
+ LOG(log_error, logtype_dsi, "dsi_stream_read: len:%d, %s",
+ len, (len < 0) ? strerror(errno) : "unexpected EOF");
+ }
+ return 0;
+ }
+ break;
+ }
+ }
+
+ dsi->read_count += stored;
+
+ LOG(log_maxdebug, logtype_dsi, "dsi_stream_read(%u bytes): got: %u", length, stored);
+ return stored;