fix fcntl_misc

system/include/libc/sys/_default_fcntl.h

@@ -204,6 +204,11 @@ extern int _open64 _PARAMS ((const char *, int, ...));
 #endif
 #endif
 
+/* XXX Emscripten */
+#define POSIX_FADV_DONTNEED 135
+int posix_fadvise(int fd, off_t offset, off_t len, int advice);
+int posix_fallocate(int fd, off_t offset, off_t len);
+
 #ifdef __cplusplus
 }
 #endif

tests/runner.py

@@ -2532,8 +2532,6 @@ if 'benchmark' not in str(sys.argv):
       self.do_test(src, expected, post_build=add_pre_run, extra_emscripten_args=['-H', 'libc/fcntl.h'])
 
     def test_fcntl_misc(self):
-      return self.skip('TODO: add fadvise.h')
-
       def add_pre_run(filename):
         src = open(filename, 'r').read().replace(
           '// {{PRE_RUN_ADDITIONS}}',