1 files changed, 133 insertions, 0 deletions
diff --git a/nuttx/fs/fs_close.c b/nuttx/fs/fs_close.c
new file mode 100644
index 000000000..7f08995de
--- /dev/null
+++ b/nuttx/fs/fs_close.c
@@ -0,0 +1,133 @@
+/****************************************************************************
+ * fs/fs_close.c
+ *
+ *   Copyright (C) 2007-2009, 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 <unistd.h>
+#include <sched.h>
+#include <errno.h>
+#include <nuttx/fs/fs.h>
+
+#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+# include <nuttx/net/net.h>
+#endif
+
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: close
+ *
+ * Description:
+ *   close() closes a file descriptor, so that it no longer refers to any
+ *   file and may be reused. Any record locks (see fcntl(2)) held on the file
+ *   it was associated with, and owned by the process, are removed (regardless
+ *   of the file descriptor that was used to obtain the lock).
+ *
+ *   If fd is the last copy of a particular file descriptor the resources
+ *   associated with it are freed; if the descriptor was the last reference
+ *   to a file which has been removed using unlink(2) the file is deleted.
+ *
+ * Parameters:
+ *   fd   file descriptor to close
+ *
+ * Returned Value:
+ *   0 on success; -1 on error with errno set appropriately.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int close(int fd)
+{
+  int err;
+#if CONFIG_NFILE_DESCRIPTORS > 0
+  int ret;
+
+  /* Did we get a valid file descriptor? */
+
+  if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS)
+#endif
+    {
+      /* Close a socket descriptor */
+
+#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+      if ((unsigned int)fd < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
+        {
+          return net_close(fd);
+        }
+      else
+#endif
+        {
+          err = EBADF;
+          goto errout;
+        }
+    }
+
+#if CONFIG_NFILE_DESCRIPTORS > 0
+  /* Close the driver or mountpoint.  NOTES: (1) there is no
+   * exclusion mechanism here , the driver or mountpoint must be
+   * able to handle concurrent operations internally, (2) The driver
+   * may have been opened numerous times (for different file
+   * descriptors) and must also handle being closed numerous times.
+   * (3) for the case of the mountpoint, we depend on the close
+   * methods bing identical in signature and position in the operations
+   * vtable.
+   */
+
+  ret = files_close(fd);
+  if (ret < 0)
+    {
+      /* An error occurred while closing the driver */
+
+      err = -ret;
+      goto errout;
+    }
+  return OK;
+
+#endif
+
+errout:
+  set_errno(err);
+  return ERROR;
+}
+