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133 lines
4.4 KiB
133 lines
4.4 KiB
/**************************************************************************** |
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* fs/fs_close.c |
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* |
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <unistd.h> |
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#include <sched.h> |
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#include <errno.h> |
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#include <nuttx/fs/fs.h> |
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 |
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# include <nuttx/net/net.h> |
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#endif |
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#include "fs_internal.h" |
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/**************************************************************************** |
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* Global Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: close |
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* |
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* Description: |
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* close() closes a file descriptor, so that it no longer refers to any |
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* file and may be reused. Any record locks (see fcntl(2)) held on the file |
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* it was associated with, and owned by the process, are removed (regardless |
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* of the file descriptor that was used to obtain the lock). |
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* |
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* If fd is the last copy of a particular file descriptor the resources |
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* associated with it are freed; if the descriptor was the last reference |
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* to a file which has been removed using unlink(2) the file is deleted. |
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* |
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* Parameters: |
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* fd file descriptor to close |
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* |
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* Returned Value: |
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* 0 on success; -1 on error with errno set appropriately. |
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* |
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* Assumptions: |
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* |
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****************************************************************************/ |
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int close(int fd) |
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{ |
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int err; |
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#if CONFIG_NFILE_DESCRIPTORS > 0 |
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int ret; |
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/* Did we get a valid file descriptor? */ |
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if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS) |
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#endif |
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{ |
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/* Close a socket descriptor */ |
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 |
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if ((unsigned int)fd < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS)) |
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{ |
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return net_close(fd); |
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} |
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else |
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#endif |
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{ |
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err = EBADF; |
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goto errout; |
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} |
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} |
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#if CONFIG_NFILE_DESCRIPTORS > 0 |
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/* Close the driver or mountpoint. NOTES: (1) there is no |
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* exclusion mechanism here , the driver or mountpoint must be |
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* able to handle concurrent operations internally, (2) The driver |
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* may have been opened numerous times (for different file |
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* descriptors) and must also handle being closed numerous times. |
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* (3) for the case of the mountpoint, we depend on the close |
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* methods bing identical in signature and position in the operations |
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* vtable. |
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*/ |
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ret = files_close(fd); |
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if (ret < 0) |
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{ |
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/* An error occurred while closing the driver */ |
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err = -ret; |
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goto errout; |
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} |
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return OK; |
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#endif |
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errout: |
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set_errno(err); |
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return ERROR; |
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} |
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