fix umask syscall #3637

src/library_syscall.js

@@ -338,12 +338,9 @@ var SyscallsLibrary = {
     return 0;
   },
   __syscall60: function(which, varargs) { // umask
-#if SYSCALL_DEBUG
-    Module.printErr('warning: untested syscall');
-#endif
     var mask = SYSCALLS.get();
     var old = SYSCALLS.umask;
-    SYSCALLS.umask = newMask;
+    SYSCALLS.umask = mask;
     return old;
   },
   __syscall63: function(which, varargs) { // dup2

tests/test_other.py

@@ -4976,3 +4976,14 @@ int main() { printf("Mary had a little lamb.\n"); }
     assert proc.returncode == 0
     self.assertContained('#define __EMSCRIPTEN__ 1', out) # all our defines should show up
 
+  def test_umask_0(self):
+    open('src.c', 'w').write(r'''
+#include <sys/stat.h>
+#include <stdio.h>
+int main() {
+  umask(0);
+  printf("hello, world!\n");
+}''')
+    Popen([PYTHON, EMCC, 'src.c']).communicate()
+    self.assertContained('hello, world!', run_js('a.out.js'))
+