1 files changed, 184 insertions, 0 deletions
diff --git a/nuttx/libc/misc/lib_stream.c b/nuttx/libc/misc/lib_stream.c
new file mode 100644
index 000000000..5b42f0c01
--- /dev/null
+++ b/nuttx/libc/misc/lib_stream.c
@@ -0,0 +1,184 @@
+/****************************************************************************
+ * libc/misc/lib_stream.c
+ *
+ *   Copyright (C) 2007, 2011, 2013-2014 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 <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/sched.h>
+#include <nuttx/fs/fs.h>
+#include <nuttx/lib.h>
+
+#include "lib_internal.h"
+
+#if (!defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL)) || \
+      defined(__KERNEL__)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_initialize
+ *
+ * Description:
+ *   General library initialization hook
+ *
+ ****************************************************************************/
+
+void weak_const_function lib_initialize(void)
+{
+}
+
+/****************************************************************************
+ * Name: lib_stream_initialize
+ *
+ * Description:
+ *   This function is called when a new task is allocated.  It initializes
+ *   the streamlist instance that is stored in the task group.
+ *
+ ****************************************************************************/
+
+#if CONFIG_NFILE_STREAMS > 0
+void lib_stream_initialize(FAR struct task_group_s *group)
+{
+  FAR struct streamlist *list;
+  int i;
+
+#if (defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)) && \
+     defined(CONFIG_MM_KERNEL_HEAP)
+  DEBUGASSERT(group && group->tg_streamlist);
+  list = group->tg_streamlist;
+#else
+  DEBUGASSERT(group);
+  list = &group->tg_streamlist;
+#endif
+
+  /* Initialize the list access mutex */
+
+  (void)sem_init(&list->sl_sem, 0, 1);
+
+  /* Initialize each FILE structure */
+
+  for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
+   {
+     /* Clear the IOB */
+
+      memset(&list->sl_streams[i], 0, sizeof(FILE));
+
+      /* Indicate not opened */
+
+      list->sl_streams[i].fs_fd = -1;
+
+      /* Initialize the stream semaphore to one to support one-at-
+       * a-time access to private data sets.
+       */
+
+      lib_sem_initialize(&list->sl_streams[i]);
+    }
+}
+#endif /* CONFIG_NFILE_STREAMS > 0 */
+
+/****************************************************************************
+ * Name: lib_stream_init
+ *
+ * Description:
+ *   This function is called when a TCB is destroyed.  Note that it does not
+ *   close the files by releasing the inode.  That happens separately when
+ *   the file descriptor list is freed.
+ *
+ ****************************************************************************/
+
+#if CONFIG_NFILE_STREAMS > 0
+void lib_stream_release(FAR struct task_group_s *group)
+{
+  FAR struct streamlist *list;
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+  int i;
+#endif
+
+#if (defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)) && \
+     defined(CONFIG_MM_KERNEL_HEAP)
+  DEBUGASSERT(group && group->tg_streamlist);
+  list = group->tg_streamlist;
+#else
+  DEBUGASSERT(group);
+  list = &group->tg_streamlist;
+#endif
+
+  /* Destroy the semaphore and release the filelist */
+
+  (void)sem_destroy(&list->sl_sem);
+
+  /* Release each stream in the list */
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+  for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
+    {
+      /* Destroy the semaphore that protects the IO buffer */
+
+      (void)sem_destroy(&list->sl_streams[i].fs_sem);
+
+      /* Release the IO buffer */
+
+      if (list->sl_streams[i].fs_bufstart)
+        {
+          sched_ufree(list->sl_streams[i].fs_bufstart);
+        }
+    }
+#endif
+}
+#endif /* CONFIG_NFILE_STREAMS > 0 */
+
+#endif /* (!CONFIG_BUILD_PROTECTED &&7 !CONFIG_BUILD_KERNEL) || __KERNEL__ */