Still trying to recover directory contents

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5330 42af7a65-404d-4744-a932-0658087f49c3

9 files changed, 1373 insertions, 0 deletions

diff --git a/nuttx/libc/misc/Make.defs b/nuttx/libc/misc/Make.defs
new file mode 100644
index 000000000..c12533f75
--- /dev/null
+++ b/nuttx/libc/misc/Make.defs
@@ -0,0 +1,69 @@
+############################################################################
+# lib/misc/Make.defs
+#
+#   Copyright (C) 2011-2012 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.
+#
+############################################################################
+
+# Add the internal C files to the build
+
+CSRCS += lib_init.c lib_filesem.c
+
+# Add C files that depend on file OR socket descriptors
+
+ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
+
+CSRCS += lib_sendfile.c
+ifneq ($(CONFIG_NFILE_STREAMS),0)
+CSRCS += lib_streamsem.c
+endif
+
+else
+ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
+
+CSRCS += lib_sendfile.c
+ifneq ($(CONFIG_NFILE_STREAMS),0)
+CSRCS += lib_streamsem.c
+endif
+
+endif
+endif
+
+# Add the miscellaneous C files to the build
+
+CSRCS += lib_match.c
+CSRCS += lib_crc32.c
+CSRCS += lib_dbg.c lib_dumpbuffer.c
+
+# Add the misc directory to the build
+
+DEPPATH += --dep-path misc
+VPATH += :misc
diff --git a/nuttx/libc/misc/lib_crc32.c b/nuttx/libc/misc/lib_crc32.c
new file mode 100644
index 000000000..f851598e0
--- /dev/null
+++ b/nuttx/libc/misc/lib_crc32.c
@@ -0,0 +1,123 @@
+/************************************************************************************************
+ * lib/misc/lib_crc32.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *
+ * The logic in this file was developed by Gary S. Brown:
+ *
+ *   COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or code or tables
+ *   extracted from it, as desired without restriction.
+ *
+ * First, the polynomial itself and its table of feedback terms.  The polynomial is:
+ *
+ *    X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
+ *
+ * Note that we take it "backwards" and put the highest-order term in the lowest-order bit.
+ * The X^32 term is "implied"; the LSB is the X^31 term, etc.  The X^0 term (usually shown
+ * as "+1") results in the MSB being 1
+ *
+ * Note that the usual hardware shift register implementation, which is what we're using
+ * (we're merely optimizing it by doing eight-bit chunks at a time) shifts bits into the
+ * lowest-order term.  In our implementation, that means shifting towards the right.  Why
+ * do we do it this way?  Because the calculated CRC must be transmitted in order from
+ * highest-order term to lowest-order term.  UARTs transmit characters in order from LSB
+ * to MSB.  By storing the CRC this way we hand it to the UART in the order low-byte to
+ * high-byte; the UART sends each low-bit to hight-bit; and the result is transmission bit
+ * by bit from highest- to lowest-order term without requiring any bit shuffling on our
+ * part.  Reception works similarly
+ *
+ * The feedback terms table consists of 256, 32-bit entries.  Notes
+ *
+ * - The table can be generated at runtime if desired; code to do so is shown later.  It
+ *   might not be obvious, but the feedback terms simply represent the results of eight
+ *   shift/xor operations for all combinations of data and CRC register values
+ *
+ * - The values must be right-shifted by eight bits by the updcrc logic; the shift must
+ *   be u_(bring in zeroes).  On some hardware you could probably optimize the shift in
+ *   assembler by using byte-swap instructions polynomial $edb88320
+  ************************************************************************************************/
+
+/************************************************************************************************
+ * Included Files
+ ************************************************************************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <crc32.h>
+
+/************************************************************************************************
+ * Private Data
+ ************************************************************************************************/
+ 
+static const uint32_t crc32_tab[] =
+{
+  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+  0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+  0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+  0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+  0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+  0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+  0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+  0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+  0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+  0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+  0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+  0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+  0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+  0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+  0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+  0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+  0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+  0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+/************************************************************************************************
+ * Public Functions
+ ************************************************************************************************/
+/************************************************************************************************
+ * Name: crc32part
+ *
+ * Description:
+ *   Continue CRC calculation on a part of the buffer.
+ *
+ ************************************************************************************************/
+
+uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val)
+{
+  size_t i;
+
+  for (i = 0;  i < len;  i++)
+    {
+      crc32val = crc32_tab[(crc32val ^ src[i]) & 0xff] ^ (crc32val >> 8);
+    }
+  return crc32val;
+}
+
+/************************************************************************************************
+ * Name: crc32
+ *
+ * Description:
+ *   Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
+ *
+ ************************************************************************************************/
+
+uint32_t crc32(FAR const uint8_t *src, size_t len)
+{
+  return crc32part(src, len, 0);
+}
diff --git a/nuttx/libc/misc/lib_dbg.c b/nuttx/libc/misc/lib_dbg.c
new file mode 100644
index 000000000..aacdaa30a
--- /dev/null
+++ b/nuttx/libc/misc/lib_dbg.c
@@ -0,0 +1,165 @@
+/****************************************************************************
+ * lib/misc/lib_dbg.c
+ *
+ *   Copyright (C) 2007-2009, 2011-2012 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 <stdarg.h>
+#include <debug.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/* Debug output is initially disabled */
+
+#ifdef CONFIG_DEBUG_ENABLE
+bool g_dbgenable;
+#endif
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dbg_enable
+ *
+ * Description:
+ *  Enable or disable debug output.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DEBUG_ENABLE
+void dbg_enable(bool enable)
+{
+  g_dbgenable = enable;
+}
+#endif
+
+/****************************************************************************
+ * Name: dbg, lldbg, vdbg
+ *
+ * Description:
+ *  If the cross-compiler's pre-processor does not support variable
+ * length arguments, then these additional APIs will be built.
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_CPP_HAVE_VARARGS
+#ifdef CONFIG_DEBUG
+int dbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_rawvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+
+#ifdef CONFIG_ARCH_LOWPUTC
+int lldbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_lowvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+#endif
+
+#ifdef CONFIG_DEBUG_VERBOSE
+int vdbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_rawvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+
+#ifdef CONFIG_ARCH_LOWPUTC
+int llvdbg(const char *format, ...)
+{
+  va_list ap;
+  int     ret;
+
+#ifdef CONFIG_DEBUG_ENABLE
+  ret = 0;
+  if (g_dbgenable)
+#endif
+    {
+      va_start(ap, format);
+      ret = lib_lowvprintf(format, ap);
+      va_end(ap);
+    }
+
+  return ret;
+}
+#endif /* CONFIG_ARCH_LOWPUTC */
+#endif /* CONFIG_DEBUG_VERBOSE */
+#endif /* CONFIG_DEBUG */
+#endif /* CONFIG_CPP_HAVE_VARARGS */
diff --git a/nuttx/libc/misc/lib_dumpbuffer.c b/nuttx/libc/misc/lib_dumpbuffer.c
new file mode 100644
index 000000000..155468ca1
--- /dev/null
+++ b/nuttx/libc/misc/lib_dumpbuffer.c
@@ -0,0 +1,129 @@
+/****************************************************************************
+ * lib/misc/lib_dumpbuffer.c
+ *
+ *   Copyright (C) 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 <nuttx/compiler.h>
+
+#include <stdint.h>
+#include <debug.h>
+
+/****************************************************************************
+ * Pre-processor definitions
+ ****************************************************************************/
+
+/* Select the lowest level debug interface available */
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_ARCH_LOWPUTC
+#    define message(format, arg...) lib_lowprintf(format, ##arg)
+#  else
+#    define message(format, arg...) lib_rawprintf(format, ##arg)
+#  endif
+#else
+#  ifdef CONFIG_ARCH_LOWPUTC
+#    define message lib_lowprintf
+#  else
+#    define message lib_rawprintf
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_dumpbuffer
+ *
+ * Description:
+ *  Do a pretty buffer dump
+ *
+ ****************************************************************************/
+
+void lib_dumpbuffer(FAR const char *msg, FAR const uint8_t *buffer, unsigned int buflen)
+{
+  int i, j, k;
+
+  message("%s (%p):\n", msg, buffer);
+  for (i = 0; i < buflen; i += 32)
+    {
+      message("%04x: ", i);
+      for (j = 0; j < 32; j++)
+        {
+          k = i + j;
+
+          if (j == 16)
+            {
+              message(" ");
+            }
+
+          if (k < buflen)
+            {
+              message("%02x", buffer[k]);
+            }
+          else
+            {
+              message("  ");
+            }
+        }
+
+      message(" ");
+      for (j = 0; j < 32; j++)
+        {
+         k = i + j;
+
+          if (j == 16)
+            {
+              message(" ");
+            }
+
+          if (k < buflen)
+            {
+              if (buffer[k] >= 0x20 && buffer[k] < 0x7f)
+                {
+                  message("%c", buffer[k]);
+                }
+              else
+                {
+                  message(".");
+                }
+            }
+        }
+      message("\n");
+   }
+}
diff --git a/nuttx/libc/misc/lib_filesem.c b/nuttx/libc/misc/lib_filesem.c
new file mode 100644
index 000000000..1d1f25c2f
--- /dev/null
+++ b/nuttx/libc/misc/lib_filesem.c
@@ -0,0 +1,145 @@
+/************************************************************************
+ * lib/misc/lib_filesem.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 <sys/types.h>
+#include <unistd.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "lib_internal.h"
+
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+/************************************************************************
+ * Global Functions
+ ************************************************************************/
+
+/************************************************************************
+ * lib_sem_initialize
+ ************************************************************************/
+
+void lib_sem_initialize(FAR struct file_struct *stream)
+{
+  /* Initialize the LIB semaphore to one (to support one-at-
+   * a-time access to private data sets.
+   */
+
+  (void)sem_init(&stream->fs_sem, 0, 1);
+
+  stream->fs_holder = -1;
+  stream->fs_counts = 0;
+}
+
+/************************************************************************
+ * lib_take_semaphore
+ ************************************************************************/
+
+void lib_take_semaphore(FAR struct file_struct *stream)
+{
+  pid_t my_pid = getpid();
+
+  /* Do I already have the semaphore? */
+
+  if (stream->fs_holder == my_pid)
+    {
+      /* Yes, just increment the number of references that I have */
+
+      stream->fs_counts++;
+    }
+  else
+    {
+      /* Take the semaphore (perhaps waiting) */
+
+      while (sem_wait(&stream->fs_sem) != 0)
+	{
+	  /* The only case that an error should occr here is if
+	   * the wait was awakened by a signal.
+	   */
+
+	  ASSERT(get_errno() == EINTR);
+	}
+
+      /* We have it.  Claim the stak and return */
+
+      stream->fs_holder = my_pid;
+      stream->fs_counts = 1;
+    }
+}
+
+/************************************************************************
+ * lib_give_semaphore
+ ************************************************************************/
+
+void lib_give_semaphore(FAR struct file_struct *stream)
+{
+  pid_t my_pid = getpid();
+
+  /* I better be holding at least one reference to the semaphore */
+
+  ASSERT(stream->fs_holder == my_pid);
+
+  /* Do I hold multiple references to the semphore */
+
+  if (stream->fs_counts > 1)
+    {
+      /* Yes, just release one count and return */
+
+      stream->fs_counts--;
+    }
+  else
+    {
+      /* Nope, this is the last reference I have */
+
+      stream->fs_holder = -1;
+      stream->fs_counts = 0;
+      ASSERT(sem_post(&stream->fs_sem) == 0);
+    }
+}
+#endif /* CONFIG_STDIO_BUFFER_SIZE */
diff --git a/nuttx/libc/misc/lib_init.c b/nuttx/libc/misc/lib_init.c
new file mode 100644
index 000000000..3403a837b
--- /dev/null
+++ b/nuttx/libc/misc/lib_init.c
@@ -0,0 +1,207 @@
+/************************************************************
+ * lib/misc/lib_init.c
+ *
+ *   Copyright (C) 2007, 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 <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/fs/fs.h>
+#include <nuttx/lib.h>
+
+#include "lib_internal.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Variables
+ ************************************************************/
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * lib_initialize
+ ************************************************************/
+
+/* General library initialization hook */
+
+void weak_const_function lib_initialize(void)
+{
+}
+
+#if CONFIG_NFILE_STREAMS > 0
+/* The following function is called when a new TCB is allocated.  It
+ * creates the streamlist instance that is stored in the TCB.
+ */
+
+FAR struct streamlist *lib_alloclist(void)
+{
+  FAR struct streamlist *list;
+  list = (FAR struct streamlist*)lib_zalloc(sizeof(struct streamlist));
+  if (list)
+    {
+      int i;
+
+      /* Start with a reference count of one */
+
+      list->sl_crefs = 1;
+
+      /* 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_filedes = -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]);
+        }
+    }
+  return list;
+
+}
+
+/* This function is called when a TCB is closed (such as with
+ * pthread_create().  It increases the reference count on the stream
+ * list.
+ */
+
+void lib_addreflist(FAR struct streamlist *list)
+{
+  if (list)
+    {
+       /* Increment the reference count on the list.
+        * NOTE: that we disable interrupts to do this
+        * (vs. taking the list semaphore).  We do this
+        * because file cleanup operations often must be
+        * done from the IDLE task which cannot wait
+        * on semaphores.
+        */
+
+       register irqstate_t flags = irqsave();
+       list->sl_crefs++;
+       irqrestore(flags);
+    }
+}
+
+/* this function is called when a TCB is destroyed.  Note that is
+ * does not close the file by release this inode.  This happens
+ * separately when the file descriptor list is freed.
+ */
+
+void lib_releaselist(FAR struct streamlist *list)
+{
+  int crefs;
+  if (list)
+    {
+       /* Decrement the reference count on the list.
+        * NOTE: that we disable interrupts to do this
+        * (vs. taking the list semaphore).  We do this
+        * because file cleanup operations often must be
+        * done from the IDLE task which cannot wait
+        * on semaphores.
+        */
+
+       register irqstate_t flags = irqsave();
+       crefs = --(list->sl_crefs);
+       irqrestore(flags);
+
+       /* If the count decrements to zero, then there is no reference
+        * to the structure and it should be deallocated.  Since there
+        * are references, it would be an error if any task still held
+        * a reference to the list's semaphore.
+        */
+
+       if (crefs <= 0)
+          {
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+            int i;
+#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_free(list->sl_streams[i].fs_bufstart);
+                 }
+             }
+#endif
+           /* Finally, release the list itself */
+
+            sched_free(list);
+         }
+     }
+}
+
+#endif /* CONFIG_NFILE_STREAMS */
+
+
diff --git a/nuttx/libc/misc/lib_match.c b/nuttx/libc/misc/lib_match.c
new file mode 100644
index 000000000..18e0632ec
--- /dev/null
+++ b/nuttx/libc/misc/lib_match.c
@@ -0,0 +1,148 @@
+/****************************************************************************
+ * lib/misc/lib_match.c - simple shell-style filename matcher
+ *
+ * Simple shell-style filename pattern matcher written by Jef Poskanzer
+ * This pattern matcher only handles '?', '*' and '**', and  multiple
+ * patterns separated by '|'.
+ *
+ *   Copyright © 1995,2000 by Jef Poskanzer <jef@mail.acme.com>.
+ *   All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <string.h>
+#include <nuttx/regex.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: match_one
+ *
+ * Description:
+ *   Does all of the work for one '|' delimited pattern
+ *
+ * Returned Value:
+ *   Returns 1 (match) or 0 (no-match).
+ *
+ ****************************************************************************/
+
+static int match_one(const char *pattern, int patlen, const char *string)
+{
+  const char *p;
+  int pl;
+  int i;
+
+  for (p = pattern; p - pattern < patlen; p++, string++)
+    {
+      if (*p == '?' && *string != '\0')
+        {
+          continue;
+        }
+
+      if (*p == '*')
+        {
+          p++;
+          if (*p == '*')
+            {
+              /* Double-wildcard matches anything. */
+
+              p++;
+              i = strlen(string);
+            }
+          else
+            {
+              /* Single-wildcard matches anything but slash. */
+
+              i = strcspn(string, "/");
+            }
+
+          pl = patlen - (p - pattern);
+          for (; i >= 0; i--)
+            {
+              if (match_one(p, pl, &(string[i])))
+                {
+                  return 1;
+                }
+            }
+          return 0;
+        }
+
+      if (*p != *string)
+        {
+          return 0;
+        }
+    }
+
+  if (*string == '\0')
+    {
+      return 1;
+    }
+  return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: match
+ *
+ * Description:
+ *   Simple shell-style filename pattern matcher written by Jef Poskanzer
+ *   This pattern matcher only handles '?', '*' and '**', and  multiple
+ *   patterns separated by '|'.
+ *
+ * Returned Value:
+ *   Returns 1 (match) or 0 (no-match).
+ *
+ ****************************************************************************/
+
+int match(const char *pattern, const char *string)
+{
+  const char *or;
+
+  for (;;)
+    {
+      or = strchr(pattern, '|');
+      if (or == (char *)0)
+        {
+          return match_one(pattern, strlen(pattern), string);
+        }
+
+      if (match_one(pattern, or - pattern, string))
+        {
+          return 1;
+        }
+
+      pattern = or + 1;
+    }
+}
+
diff --git a/nuttx/libc/misc/lib_sendfile.c b/nuttx/libc/misc/lib_sendfile.c
new file mode 100644
index 000000000..a82eb325e
--- /dev/null
+++ b/nuttx/libc/misc/lib_sendfile.c
@@ -0,0 +1,297 @@
+/************************************************************************
+ * lib/misc/lib_streamsem.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 <sys/sendfile.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#if CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0
+
+/************************************************************************
+ * Private types
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Public Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: sendfile
+ *
+ * Description:
+ *   sendfile() copies data between one file descriptor and another.
+ *   sendfile() basically just wraps a sequence of reads() and writes()
+ *   to perform a copy.  It serves a purpose in systems where there is
+ *   a penalty for copies to between user and kernal space, but really
+ *   nothing in NuttX but provide some Linux compatible (and adding
+ *   another 'almost standard' interface). 
+ *
+ *   NOTE: This interface is *not* specified in POSIX.1-2001, or other
+ *   standards.  The implementation here is very similar to the Linux
+ *   sendfile interface.  Other UNIX systems implement sendfile() with
+ *   different semantics and prototypes.  sendfile() should not be used
+ *   in portable programs.
+ *
+ * Input Parmeters:
+ *   infd   - A file (or socket) descriptor opened for reading
+ *   outfd  - A descriptor opened for writing.
+ *   offset - If 'offset' is not NULL, then it points to a variable
+ *            holding the file offset from which sendfile() will start
+ *            reading data from 'infd'.  When sendfile() returns, this
+ *            variable will be set to the offset of the byte following
+ *            the last byte that was read.  If 'offset' is not NULL,
+ *            then sendfile() does not modify the current file offset of
+ *            'infd'; otherwise the current file offset is adjusted to
+ *            reflect the number of bytes read from 'infd.'
+ *
+ *            If 'offset' is NULL, then data will be read from 'infd'
+ *            starting at the current file offset, and the file offset
+ *            will be updated by the call.
+ *   count -  The number of bytes to copy between the file descriptors.
+ *
+ * Returned Value:
+ *   If the transfer was successful, the number of bytes written to outfd is
+ *   returned.  On error, -1 is returned, and errno is set appropriately.
+ *   There error values are those returned by read() or write() plus:
+ *
+ *   EINVAL - Bad input parameters.
+ *   ENOMEM - Could not allocated an I/O buffer
+ *
+ ************************************************************************/
+
+ssize_t sendfile(int outfd, int infd, off_t *offset, size_t count)
+{
+  FAR uint8_t *iobuffer;
+  FAR uint8_t *wrbuffer;
+  off_t startpos = 0;
+  ssize_t nbytesread;
+  ssize_t nbyteswritten;
+  size_t  ntransferred;
+  bool endxfr;
+
+  /* Get the current file position. */
+
+  if (offset)
+    {
+      /* Use lseek to get the current file position */
+
+      startpos = lseek(infd, 0, SEEK_CUR);
+      if (startpos == (off_t)-1)
+        {
+          return ERROR;
+        }
+
+      /* Use lseek again to set the new file position */
+
+      if (lseek(infd, *offset, SEEK_SET) == (off_t)-1)
+        {
+          return ERROR;
+        }
+    }
+
+  /* Allocate an I/O buffer */
+
+  iobuffer = (FAR void *)malloc(CONFIG_LIB_SENDFILE_BUFSIZE);
+  if (!iobuffer)
+    {
+      set_errno(ENOMEM);
+      return ERROR;
+    }
+
+  /* Now transfer 'count' bytes from the infd to the outfd */
+
+  for (ntransferred = 0, endxfr = false; ntransferred < count && !endxfr; )
+    {
+      /* Loop until the read side of the transfer comes to some conclusion */
+
+      do
+        {
+          /* Read a buffer of data from the infd */
+
+          nbytesread = read(infd, iobuffer, CONFIG_LIB_SENDFILE_BUFSIZE);
+
+          /* Check for end of file */
+
+          if (nbytesread == 0)
+            {
+              /* End of file.  Break out and return current number of bytes
+               * transferred.
+               */
+
+              endxfr = true;
+              break;
+            }
+
+          /* Check for a read ERROR.  EINTR is a special case.  This function
+           * should break out and return an error if EINTR is returned and
+           * no data has been transferred.  But what should it do if some
+           * data has been transferred?  I suppose just continue?
+           */
+
+          else if (nbytesread < 0)
+            {
+              /* EINTR is not an error (but will still stop the copy) */
+
+#ifndef CONFIG_DISABLE_SIGNALS
+              if (errno != EINTR || ntransferred == 0)
+#endif
+                {
+                  /* Read error.  Break out and return the error condition. */
+
+                  ntransferred = ERROR;
+                  endxfr       = true;
+                  break;
+                }
+            }
+        }
+      while (nbytesread < 0);
+
+      /* Was anything read? */
+
+      if (!endxfr)
+        {
+          /* Yes.. Loop until the read side of the transfer comes to some
+           * conclusion.
+           */
+
+          wrbuffer = iobuffer;
+          do
+            {
+              /* Write the buffer of data to the outfd */
+
+              nbyteswritten = write(outfd, wrbuffer, nbytesread);
+
+              /* Check for a complete (or parial) write.  write() should not
+               * return zero.
+               */
+
+              if (nbyteswritten >= 0)
+                {
+                  /* Advance the buffer pointer and decrement the number of bytes
+                   * remaining in the iobuffer.  Typically, nbytesread will now
+                   * be zero.
+                   */
+
+                  wrbuffer     += nbyteswritten;
+                  nbytesread   -= nbyteswritten;
+
+                  /* Increment the total number of bytes successfully transferred. */
+
+                  ntransferred += nbyteswritten;
+                }
+
+              /* Otherwise an error occurred */
+
+              else
+                {
+                  /* Check for a read ERROR.  EINTR is a special case.  This
+                   * function should break out and return an error if EINTR
+                   * is returned and no data has been transferred.  But what
+                   * should it do if some data has been transferred?  I
+                   * suppose just continue?
+                   */
+
+#ifndef CONFIG_DISABLE_SIGNALS
+                  if (errno != EINTR || ntransferred == 0)
+#endif
+                    {
+                      /* Write error.  Break out and return the error condition */
+
+                      ntransferred = ERROR;
+                      endxfr       = true;
+                      break;
+                    }
+                }
+            }
+          while (nbytesread > 0);
+        }
+    }
+
+  /* Release the I/O buffer */
+
+  free(iobuffer);
+
+  /* Return the current file position */
+
+  if (offset)
+    {
+      /* Use lseek to get the current file position */
+
+      off_t curpos = lseek(infd, 0, SEEK_CUR);
+      if (curpos == (off_t)-1)
+        {
+          return ERROR;
+        }
+
+      /* Return the current file position */
+
+      *offset = curpos;
+
+      /* Use lseek again to restore the original file position */
+
+      if (lseek(infd, startpos, SEEK_SET) == (off_t)-1)
+        {
+          return ERROR;
+        }
+    }
+
+  /* Finally return the number of bytes actually transferred (or ERROR
+   * if any failure occurred).
+   */
+
+  return ntransferred;
+}
+
+#endif /* CONFIG_NSOCKET_DESCRIPTORS > 0 || CONFIG_NFILE_DESCRIPTORS > 0 */
diff --git a/nuttx/libc/misc/lib_streamsem.c b/nuttx/libc/misc/lib_streamsem.c
new file mode 100644
index 000000000..fdf494e75
--- /dev/null
+++ b/nuttx/libc/misc/lib_streamsem.c
@@ -0,0 +1,90 @@
+/************************************************************************
+ * lib/misc/lib_streamsem.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 <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <nuttx/fs/fs.h>
+
+#include "lib_internal.h"
+
+/************************************************************************
+ * Private types
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Public Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+void stream_semtake(FAR struct streamlist *list)
+{
+  /* Take the semaphore (perhaps waiting) */
+
+  while (sem_wait(&list->sl_sem) != 0)
+    {
+      /* The only case that an error should occr here is if
+       * the wait was awakened by a signal.
+       */
+
+      ASSERT(get_errno() == EINTR);
+    }
+}
+
+void stream_semgive(FAR struct streamlist *list)
+{
+  sem_post(&list->sl_sem);
+}
+
+