2008-10-14 Wei Shen <cquark@gmail.com>

	* Makefile.am, preinstall.am, libcsupport/src/mknod.c,
	libcsupport/src/open.c, libcsupport/src/pipe.c, libfs/Makefile.am,
	libfs/preinstall.am, libfs/src/imfs/imfs.h,
	libfs/src/imfs/imfs_creat.c, libfs/src/imfs/imfs_debug.c,
	libfs/src/imfs/imfs_eval.c, libfs/src/imfs/imfs_initsupp.c,
	libfs/src/imfs/imfs_mknod.c, libfs/src/imfs/imfs_stat.c,
	libfs/src/imfs/memfile.c: Initial commit of POSIX pipe support.
	* libfs/src/imfs/imfs_fifo.c, libfs/src/pipe/fifo.c,
	libfs/src/pipe/pipe.c, libfs/src/pipe/pipe.h: New files.

1 files changed, 113 insertions, 0 deletions

diff --git a/cpukit/libfs/src/pipe/pipe.h b/cpukit/libfs/src/pipe/pipe.h
new file mode 100644
index 0000000000..54f7525524
--- /dev/null
+++ b/cpukit/libfs/src/pipe/pipe.h
@@ -0,0 +1,113 @@
+/*
+ * pipe.h: header of POSIX FIFO/pipe
+ *
+ * Author: Wei Shen <cquark@gmail.com>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+
+#ifndef _RTEMS_PIPE_H
+#define _RTEMS_PIPE_H
+
+#include <rtems/libio.h>
+
+/* Control block to manage each pipe */
+typedef struct pipe_control {
+  char *Buffer;
+  uint Size;
+  uint Start;
+  uint Length;
+  uint Readers;
+  uint Writers;
+  uint waitingReaders;
+  uint waitingWriters;
+  uint readerCounter;     /* incremental counters */
+  uint writerCounter;     /* for differentiation of successive opens */
+  rtems_id Semaphore;
+  rtems_id readBarrier;   /* wait queues */
+  rtems_id writeBarrier;
+#if 0
+  boolean Anonymous;      /* anonymous pipe or FIFO */
+#endif
+} pipe_control_t;
+
+/*
+ * Called by pipe() to create an anonymous pipe.
+ */
+int pipe_create(
+  int filsdes[2]
+);
+
+/*
+ * Interface to file system close.
+ *
+ * *pipep points to pipe control structure. When the last user releases pipe,
+ * it will be set to NULL.
+ */
+int pipe_release(
+  pipe_control_t **pipep,
+  rtems_libio_t *iop
+);
+
+/*
+ * Interface to file system open.
+ *
+ * *pipep points to pipe control structure. If called with *pipep = NULL,
+ * fifo_open will try allocating and initializing a control structure. If the
+ * call succeeds, *pipep will be set to address of new control structure.
+ */
+int fifo_open(
+  pipe_control_t **pipep,
+  rtems_libio_t *iop
+);
+
+/*
+ * Interface to file system read.
+ */
+ssize_t pipe_read(
+  pipe_control_t *pipe,
+  void           *buffer,
+  size_t          count,
+  rtems_libio_t  *iop
+);
+
+/*
+ * Interface to file system write.
+ */
+ssize_t pipe_write(
+  pipe_control_t *pipe,
+  const void     *buffer,
+  size_t          count,
+  rtems_libio_t  *iop
+);
+
+/*
+ * Interface to file system ioctl.
+ */
+int pipe_ioctl(
+  pipe_control_t *pipe,
+  uint32_t        cmd,
+  void           *buffer,
+  rtems_libio_t  *iop
+);
+
+/*
+ * Interface to file system lseek.
+ */
+int pipe_lseek(
+  pipe_control_t *pipe,
+  off_t           offset,
+  int             whence,
+  rtems_libio_t  *iop
+);
+
+/*
+ * Initialization of FIFO/pipe module.
+ */
+void rtems_pipe_initialize (void);
+
+#endif  /* #define _RTEMS_PIPE_H */