report better error in fread on bad stream

1 files changed, 4 insertions, 1 deletions

diff --git a/src/library.js b/src/library.js
index d6601077..26d766e9 100644
--- a/src/library.js
+++ b/src/library.js
@@ -2519,7 +2519,10 @@ LibraryManager.library = {
     }
     var bytesRead = 0;
     var streamObj = FS.getStream(stream);
-    if (!streamObj) return 0;
+    if (!streamObj) {
+      ___setErrNo(ERRNO_CODES.EBADF);
+      return 0;
+    }
     while (streamObj.ungotten.length && bytesToRead > 0) {
       {{{ makeSetValue('ptr++', '0', 'streamObj.ungotten.pop()', 'i8') }}}
       bytesToRead--;