1 files changed, 136 insertions, 0 deletions
diff --git a/nuttx/drivers/pipes/pipe_common.h b/nuttx/drivers/pipes/pipe_common.h
new file mode 100644
index 000000000..9e9f27fc1
--- /dev/null
+++ b/nuttx/drivers/pipes/pipe_common.h
@@ -0,0 +1,136 @@
+/****************************************************************************
+ * drivers/pipe/pipe_common.h
+ *
+ *   Copyright (C) 2008i-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.
+ *
+ ****************************************************************************/
+
+#ifndef __DRIVERS_PIPE_COMMON_H
+#define __DRIVERS_PIPE_COMMON_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <poll.h>
+
+#ifndef CONFIG_DEV_PIPE_SIZE
+#  define CONFIG_DEV_PIPE_SIZE 1024
+#endif
+
+#if CONFIG_DEV_PIPE_SIZE > 0
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Maximum number of threads than can be waiting for POLL events */
+
+#ifndef CONFIG_DEV_PIPE_NPOLLWAITERS
+#  define CONFIG_DEV_PIPE_NPOLLWAITERS 2
+#endif
+
+/* Maximum number of open's supported on pipe */
+
+#define CONFIG_DEV_PIPE_MAXUSER 255
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* Make the buffer index as small as possible for the configured pipe size */
+ 
+#if CONFIG_DEV_PIPE_SIZE > 65535
+typedef uint32 pipe_ndx_t;  /* 32-bit index */
+#elif CONFIG_DEV_PIPE_SIZE > 255
+typedef uint16 pipe_ndx_t;  /* 16-bit index */
+#else
+typedef ubyte pipe_ndx_t;   /*  8-bit index */
+#endif
+
+/* This structure represents the state of one pipe.  A reference to this
+ * structure is retained in the i_private field of the inode whenthe pipe/fifo
+ * device is registered.
+ */
+
+struct pipe_dev_s
+{
+  sem_t      d_bfsem;       /* Used to serialize access to d_buffer and indices */
+  sem_t      d_rdsem;       /* Empty buffer - Reader waits for data write */
+  sem_t      d_wrsem;       /* Full buffer - Writer waits for data read */
+  pipe_ndx_t d_wrndx;       /* Index in d_buffer to save next byte written */
+  pipe_ndx_t d_rdndx;       /* Index in d_buffer to return the next byte read */
+  ubyte      d_refs;        /* References counts on pipe (limited to 255) */
+  ubyte      d_nwriters;    /* Number of reference counts for write access */
+  ubyte      d_pipeno;      /* Pipe minor number */
+  ubyte     *d_buffer;      /* Buffer allocated when device opened */
+
+  /* The following is a list if poll structures of threads waiting for
+   * driver events. The 'struct pollfd' reference for each open is also
+   * retained in the f_priv field of the 'struct file'.
+   */
+
+#ifndef CONFIG_DISABLE_POLL
+  struct pollfd *d_fds[CONFIG_DEV_PIPE_NPOLLWAITERS];
+#endif
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#  define EXTERN extern "C"
+extern "C" {
+#else
+#  define EXTERN extern
+#endif
+
+EXTERN FAR struct pipe_dev_s *pipecommon_allocdev(void);
+EXTERN void    pipecommon_freedev(FAR struct pipe_dev_s *dev);
+EXTERN int     pipecommon_open(FAR struct file *filep);
+EXTERN int     pipecommon_close(FAR struct file *filep);
+EXTERN ssize_t pipecommon_read(FAR struct file *, FAR char *, size_t);
+EXTERN ssize_t pipecommon_write(FAR struct file *, FAR const char *, size_t);
+#ifndef CONFIG_DISABLE_POLL
+EXTERN int     pipecommon_poll(FAR struct file *filep, FAR struct pollfd *fds,
+                               boolean setup);
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_DEV_PIPE_SIZE > 0 */
+#endif /* __DRIVERS_PIPE_COMMON_H */