1 files changed, 45 insertions, 0 deletions
diff --git a/libc/stdio/fileno.c b/libc/stdio/fileno.c
new file mode 100644
index 000000000..fbfa66551
--- /dev/null
+++ b/libc/stdio/fileno.c
@@ -0,0 +1,45 @@
+/* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
+ *
+ * GNU Library General Public License (LGPL) version 2 or later.
+ *
+ * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
+ */
+
+#include "_stdio.h"
+
+#ifdef __DO_UNLOCKED
+
+weak_alias(__fileno_unlocked,fileno_unlocked);
+#ifndef __UCLIBC_HAS_THREADS__
+weak_alias(__fileno_unlocked,fileno);
+#endif
+
+int __fileno_unlocked(register FILE *stream)
+{
+	__STDIO_STREAM_VALIDATE(stream);
+
+	if ((!__STDIO_STREAM_IS_CUSTOM(stream)) && (stream->__filedes >= 0)) {
+		return stream->__filedes;
+	}
+
+	__set_errno(EBADF);
+	return -1;
+}
+
+#elif defined __UCLIBC_HAS_THREADS__
+
+int fileno(register FILE *stream)
+{
+	int retval;
+	__STDIO_AUTO_THREADLOCK_VAR;
+
+	__STDIO_AUTO_THREADLOCK(stream);
+
+	retval = __fileno_unlocked(stream);
+
+	__STDIO_AUTO_THREADUNLOCK(stream);
+
+	return retval;
+}
+
+#endif