1 files changed, 60 insertions, 0 deletions
diff --git a/usr/klibc/stdio/fflush.c b/usr/klibc/stdio/fflush.c
new file mode 100644
index 0000000..6ac5cf5
--- /dev/null
+++ b/usr/klibc/stdio/fflush.c
@@ -0,0 +1,60 @@
+/*
+ * fflush.c
+ */
+
+#include "stdioint.h"
+
+int __fflush(struct _IO_file_pvt *f)
+{
+	ssize_t rv;
+	char *p;
+
+	/*
+	 * Flush any unused input data.  If there is input data, there
+	 * won't be any output data.
+	 */
+	if (__unlikely(f->ibytes))
+		return fseek(&f->pub, 0, SEEK_CUR);
+
+	p = f->buf;
+	while (f->obytes) {
+		rv = write(f->pub._IO_fileno, p, f->obytes);
+		if (rv == -1) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			f->pub._IO_error = true;
+			return EOF;
+		} else if (rv == 0) {
+			/* EOF on output? */
+			f->pub._IO_eof = true;
+			return EOF;
+		}
+
+		p += rv;
+		f->obytes -= rv;
+	}
+
+	return 0;
+}
+
+int fflush(FILE *file)
+{
+	struct _IO_file_pvt *f;
+
+	if (__likely(file)) {
+		f = stdio_pvt(file);
+		return __fflush(f);
+	} else {
+		int err = 0;
+
+		for (f = __stdio_headnode.next;
+		     f != &__stdio_headnode;
+		     f = f->next) {
+			if (f->obytes)
+				err |= __fflush(f);
+		}
+		return err;
+	}
+}
+__ALIAS(int, fflush_unlocked, (FILE *), fflush)
+