1 files changed, 139 insertions, 0 deletions
diff --git a/nuttx/drivers/pipes/fifo.c b/nuttx/drivers/pipes/fifo.c
new file mode 100644
index 000000000..bc9f629f5
--- /dev/null
+++ b/nuttx/drivers/pipes/fifo.c
@@ -0,0 +1,139 @@
+/****************************************************************************
+ * drivers/pipes/fifo.c
+ *
+ *   Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Compilation Switches
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <nuttx/fs.h>
+#include <errno.h>
+
+#include "pipe_common.h"
+
+#if CONFIG_DEV_PIPE_SIZE > 0
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct file_operations fifo_fops =
+{
+  pipecommon_open,  /* open */
+  pipecommon_close, /* close */
+  pipecommon_read,  /* read */
+  pipecommon_write, /* write */
+  0,                /* seek */
+  0                 /* ioctl */
+#ifndef CONFIG_DISABLE_POLL
+  , pipecommon_poll /* poll */
+#endif
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mkfifo
+ *
+ * Description:
+ *   mkfifo() makes a FIFO device driver file with name 'pathname.'  Unlike
+ *   Linux, a NuttX FIFO is not a special file type but simply a device driver
+ *   instance.  'mode' specifies the FIFO's permissions. 
+ *
+ *   Once the FIFO has been created by mkfifo(), any thread can open it for
+ *   reading or writing, in the same way as an ordinary file. However, it must
+ *   have been opened from both reading and writing before input or output
+ *   can be performed.  This FIFO implementation will block all attempts to
+ *   open a FIFO read-only until at least one thread has opened the FIFO for
+ *   writing.
+ *
+ *   If all threads that write to the FIFO have closed, subsequent calls to
+ *   read() on the FIFO will return 0 (end-of-file).
+ *
+ * Inputs:
+ *   pathname - The full path to the FIFO instance to attach to or to create
+ *     (if not already created).
+ *   mode - Ignored for now
+ *
+ * Return:
+ *   0 is returned on success; otherwise, -1 is returned with errno set
+ *   appropriately.
+ *
+ ****************************************************************************/
+int mkfifo(FAR const char *pathname, mode_t mode)
+{
+  struct pipe_dev_s *dev;
+  int ret;
+ 
+  /* Allocate and initialize a new device structure instance */
+
+  dev = pipecommon_allocdev();
+  if (!dev)
+    {
+      return -ENOMEM;
+    }
+
+  ret = register_driver(pathname, &fifo_fops, mode, (void*)dev);
+  if (ret != 0)
+    {
+      pipecommon_freedev(dev);
+    }
+  return ret;
+}
+#endif /* CONFIG_DEV_PIPE_SIZE > 0 */