1 files changed, 132 insertions, 0 deletions
diff --git a/nuttx/libc/stdio/lib_fflush.c b/nuttx/libc/stdio/lib_fflush.c
new file mode 100644
index 000000000..a84a14a59
--- /dev/null
+++ b/nuttx/libc/stdio/lib_fflush.c
@@ -0,0 +1,132 @@
+/****************************************************************************
+ * libc/stdio/lib_fflush.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fflush
+ *
+ * Description:
+ *  The function fflush() forces a write of all user-space buffered data for
+ *  the given output or update stream via the stream's underlying write
+ *  function.  The open status of the stream is unaffected.
+ *
+ *  If the stream argument is NULL, fflush() flushes all open output streams.
+ *
+ * Return:
+ *  OK on success EOF on failure (with errno set appropriately)
+ *
+ ****************************************************************************/
+
+int fflush(FAR FILE *stream)
+{
+  int ret;
+
+  /* Is the stream argument NULL? */
+
+  if (!stream)
+    {
+      /* Yes... then this is a request to flush all streams */
+
+      ret = lib_flushall(sched_getstreams());
+    }
+  else
+    {
+      ret = lib_fflush(stream, true);
+    }
+
+  /* Check the return value */
+
+  if (ret < 0)
+    {
+      /* An error occurred during the flush AND/OR we were unable to flush
+       * all of the buffered write data. Set the errno value.
+       */
+
+      set_errno(-ret);
+
+      /* And return EOF on failure. */
+
+      return EOF;
+    }
+
+  return OK;
+}
+