1 files changed, 16 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/fileno.c b/libc-top-half/musl/src/stdio/fileno.c
new file mode 100644
index 0000000..0bd0e98
--- /dev/null
+++ b/libc-top-half/musl/src/stdio/fileno.c
@@ -0,0 +1,16 @@
+#include "stdio_impl.h"
+#include <errno.h>
+
+int fileno(FILE *f)
+{
+	FLOCK(f);
+	int fd = f->fd;
+	FUNLOCK(f);
+	if (fd < 0) {
+		errno = EBADF;
+		return -1;
+	}
+	return fd;
+}
+
+weak_alias(fileno, fileno_unlocked);