NuttX RTOS

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 167 insertions, 0 deletions

diff --git a/nuttx/fs/fs_open.c b/nuttx/fs/fs_open.c
new file mode 100644
index 000000000..deedd60fe
--- /dev/null
+++ b/nuttx/fs/fs_open.c
@@ -0,0 +1,167 @@
+/************************************************************
+ * fs_open.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 Gregory Nutt 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.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+
+#if CONFIG_NFILE_DESCRIPTORS >0
+
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <sched.h>
+#include <errno.h>
+
+#ifdef CONFIG_FILE_MODE
+#include <stdarg.h>
+#endif
+
+#include <nuttx/fs.h>
+#include <errno.h>
+
+#include "fs_internal.h"
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+int inode_checkflags(struct inode *inode, int oflags)
+{
+  if (((oflags & O_RDOK) != 0 && !inode->i_ops->read) ||
+      ((oflags & O_WROK) != 0 && !inode->i_ops->write))
+    {
+      *get_errno_ptr() = EACCES;
+      return ERROR;
+    }
+  else
+    {
+      return OK;
+    }
+}
+
+int open(const char *path, int oflags, ...)
+{
+  struct filelist *list;
+  struct inode *inode;
+  int status;
+  int fd;
+
+  /* Get the thread-specific file list */
+
+  list = sched_getfiles();
+  if (!list)
+    {
+      *get_errno_ptr() = EMFILE;
+      return ERROR;
+    }
+
+#ifdef CONFIG_FILE_MODE
+# warning "File creation not implemented"
+  mode_t mode = 0;
+
+  /* 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);
+  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.
+       */
+
+      *get_errno_ptr() = ENOENT;
+      return ERROR;
+    }
+
+  /* Make sure that the inode supports the requested access */
+
+  if (inode_checkflags(inode, oflags) != OK)
+    {
+      inode_release(inode);
+      return ERROR;
+    }
+
+  /* Associate the inode with a file structure */
+
+  fd = files_allocate(inode, oflags, 0);
+  if (fd < 0)
+    {
+      inode_release(inode);
+      *get_errno_ptr() = EMFILE;
+      return ERROR;
+    }
+
+  /* Perform the driver open operation */
+
+  status = OK;
+  if (inode->i_ops && inode->i_ops->open)
+    {
+      status = inode->i_ops->open(&list->fl_files[fd]);
+    }
+
+  if (status != OK || !inode->i_ops)
+    {
+      files_release(fd);
+      inode_release(inode);
+      *get_errno_ptr() = ENODEV;
+      return ERROR;
+    }
+
+  return fd;
+}
+
+#endif /* CONFIG_NFILE_DESCRIPTORS */