1 files changed, 47 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/fflush.c b/libc-top-half/musl/src/stdio/fflush.c
new file mode 100644
index 0000000..b009437
--- /dev/null
+++ b/libc-top-half/musl/src/stdio/fflush.c
@@ -0,0 +1,47 @@
+#include "stdio_impl.h"
+
+/* stdout.c will override this if linked */
+static FILE *volatile dummy = 0;
+weak_alias(dummy, __stdout_used);
+weak_alias(dummy, __stderr_used);
+
+int fflush(FILE *f)
+{
+	if (!f) {
+		int r = 0;
+		if (__stdout_used) r |= fflush(__stdout_used);
+		if (__stderr_used) r |= fflush(__stderr_used);
+
+		for (f=*__ofl_lock(); f; f=f->next) {
+			FLOCK(f);
+			if (f->wpos != f->wbase) r |= fflush(f);
+			FUNLOCK(f);
+		}
+		__ofl_unlock();
+
+		return r;
+	}
+
+	FLOCK(f);
+
+	/* If writing, flush output */
+	if (f->wpos != f->wbase) {
+		f->write(f, 0, 0);
+		if (!f->wpos) {
+			FUNLOCK(f);
+			return EOF;
+		}
+	}
+
+	/* If reading, sync position, per POSIX */
+	if (f->rpos != f->rend) f->seek(f, f->rpos-f->rend, SEEK_CUR);
+
+	/* Clear read and write modes */
+	f->wpos = f->wbase = f->wend = 0;
+	f->rpos = f->rend = 0;
+
+	FUNLOCK(f);
+	return 0;
+}
+
+weak_alias(fflush, fflush_unlocked);