Index: main/file.c
===================================================================
--- main/file.c	(revision 288636)
+++ main/file.c	(working copy)
@@ -961,10 +961,12 @@
 	 * done this way because there is no where for ast_openstream_full to
 	 * return the file had no data. */
 	seekattempt = fseek(fs->f, -1, SEEK_END);
-	if (!seekattempt)
+	if (seekattempt && errno == EINVAL) {
+		/* Zero-length file, as opposed to a pipe */
+		return 0;
+	} else {
 		ast_seekstream(fs, 0, SEEK_SET);
-	else
-		return 0;
+	}
 
 	vfs = ast_openvstream(chan, filename, preflang);
 	if (vfs) {