1 files changed, 25 insertions, 0 deletions
diff --git a/stdio/stdio_ext.h b/stdio/stdio_ext.h
new file mode 100644
index 0000000..ea8b671
--- /dev/null
+++ b/stdio/stdio_ext.h
@@ -0,0 +1,25 @@
+#ifndef COSMOPOLITAN_LIBC_STDIO_STDIO_EXT_H_
+#define COSMOPOLITAN_LIBC_STDIO_STDIO_EXT_H_
+#include "libc/stdio/stdio.h"
+
+#define FSETLOCKING_QUERY    0
+#define FSETLOCKING_INTERNAL 1
+#define FSETLOCKING_BYCALLER 2
+
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+size_t __fbufsize(FILE *);
+size_t __fpending(FILE *);
+int __flbf(FILE *);
+int __freadable(FILE *);
+int __fwritable(FILE *);
+int __freading(FILE *);
+int __fwriting(FILE *);
+int __fsetlocking(FILE *, int);
+void _flushlbf(void);
+void __fpurge(FILE *);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_STDIO_STDIO_EXT_H_ */