diff options
Diffstat (limited to 'nuttx/fs/fs_close.c')
-rw-r--r-- | nuttx/fs/fs_close.c | 133 |
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; +} + |