Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-28 09:53:34 +08:00 · 2012-09-17 18:18:44 +00:00
commit 57623d42eb
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+/****************************************************************************
+ * fs_open.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 <sys/types.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <errno.h>
+#ifdef CONFIG_FILE_MODE
+#include <stdarg.h>
+#endif
+#include <nuttx/fs/fs.h>
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inode_checkflags
+ *
+ * Description:
+ *   Check if the access described by 'oflags' is supported on 'inode'
+ *
+ ****************************************************************************/
+
+int inode_checkflags(FAR struct inode *inode, int oflags)
+{
+  if (((oflags & O_RDOK) != 0 && !inode->u.i_ops->read) ||
+      ((oflags & O_WROK) != 0 && !inode->u.i_ops->write))
+    {
+      return -EACCES;
+    }
+  else
+    {
+      return OK;
+    }
+}
+
+/****************************************************************************
+ * Name: open
+ *
+ * Description:
+ *   Standard 'open' interface
+ *
+ ****************************************************************************/
+
+int open(const char *path, int oflags, ...)
+{
+  FAR struct filelist *list;
+  FAR struct inode    *inode;
+  FAR const char      *relpath = NULL;
+#if defined(CONFIG_FILE_MODE) || !defined(CONFIG_DISABLE_MOUNTPOINT)
+  mode_t               mode = 0666;
+#endif
+  int                  ret;
+  int                  fd;
+
+  /* Get the thread-specific file list */
+
+  list = sched_getfiles();
+  if (!list)
+    {
+      ret = EMFILE;
+      goto errout;
+    }
+
+#ifdef CONFIG_FILE_MODE
+#  ifdef CONFIG_CPP_HAVE_WARNING
+#    warning "File creation not implemented"
+#  endif
+
+  /* If the file is opened for creation, then get the mode bits */
+
+  if (oflags & (O_WRONLY|O_CREAT) != 0)
+    {
+      va_list ap;
+      va_start(ap, oflags);
+      mode = va_arg(ap, mode_t);
+      va_end(ap);
+    }
+#endif
+
+  /* Get an inode for this file */
+
+  inode = inode_find(path, &relpath);
+  if (!inode)
+    {
+      /* "O_CREAT is not set and the named file does not exist.  Or, a
+       * directory component in pathname does not exist or is a dangling
+       * symbolic link."
+       */
+
+      ret = ENOENT;
+      goto errout;
+    }
+
+  /* Verify that the inode is valid and either a "normal" or a mountpoint.  We
+   * specifically exclude block drivers.
+   */
+
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+  if ((!INODE_IS_DRIVER(inode) && !INODE_IS_MOUNTPT(inode)) || !inode->u.i_ops)
+#else
+  if (!INODE_IS_DRIVER(inode) || !inode->u.i_ops)
+#endif
+    {
+      ret = ENXIO;
+      goto errout_with_inode;
+    }
+
+  /* Make sure that the inode supports the requested access */
+
+  ret = inode_checkflags(inode, oflags);
+  if (ret < 0)
+    {
+      ret = -ret;
+      goto errout_with_inode;
+    }
+
+  /* Associate the inode with a file structure */
+
+  fd = files_allocate(inode, oflags, 0, 0);
+  if (fd < 0)
+    {
+      ret = EMFILE;
+      goto errout_with_inode;
+    }
+
+  /* Perform the driver open operation.  NOTE that the open method may be
+   * called many times.  The driver/mountpoint logic should handled this
+   * because it may also be closed that many times.
+   */
+
+  ret = OK;
+  if (inode->u.i_ops->open)
+    {
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+      if (INODE_IS_MOUNTPT(inode))
+        {
+          ret = inode->u.i_mops->open((FAR struct file*)&list->fl_files[fd],
+                                      relpath, oflags, mode);
+        }
+      else
+#endif
+        {
+          ret = inode->u.i_ops->open((FAR struct file*)&list->fl_files[fd]);
+        }
+    }
+
+  if (ret < 0)
+    {
+      ret = -ret;
+      goto errout_with_fd;
+    }
+
+  return fd;
+
+ errout_with_fd:
+  files_release(fd);
+ errout_with_inode:
+  inode_release(inode);
+ errout:
+  set_errno(ret);
+  return ERROR;
+}