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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-02-01 22:19:20 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-02-01 22:19:20 +0000 |
commit | 51f96a502ea130e3d83eff679b560608a8246a75 (patch) | |
tree | e369db19378fc1244ded2d76e0c5e86765305eeb /nuttx/fs | |
parent | 5551ed84bf3a90972b46c67808d8ed24e6ca07d8 (diff) | |
download | px4-nuttx-51f96a502ea130e3d83eff679b560608a8246a75.tar.gz px4-nuttx-51f96a502ea130e3d83eff679b560608a8246a75.tar.bz2 px4-nuttx-51f96a502ea130e3d83eff679b560608a8246a75.zip |
Added lseek()
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@612 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/fs')
-rw-r--r-- | nuttx/fs/Makefile | 6 | ||||
-rw-r--r-- | nuttx/fs/fs_ioctl.c | 37 | ||||
-rw-r--r-- | nuttx/fs/fs_lseek.c | 179 |
3 files changed, 199 insertions, 23 deletions
diff --git a/nuttx/fs/Makefile b/nuttx/fs/Makefile index 267f89355..98218bf2a 100644 --- a/nuttx/fs/Makefile +++ b/nuttx/fs/Makefile @@ -44,9 +44,9 @@ ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0) CSRCS += fs_close.c fs_write.c fs_ioctl.c endif else -CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c fs_dup.c \ - fs_opendir.c fs_closedir.c fs_stat.c fs_readdir.c fs_readdirr.c \ - fs_seekdir.c fs_telldir.c fs_rewinddir.c fs_files.c \ +CSRCS += fs_open.c fs_close.c fs_read.c fs_write.c fs_ioctl.c fs_lseek.c \ + fs_dup.c fs_opendir.c fs_closedir.c fs_stat.c fs_readdir.c \ + fs_readdirr.c fs_seekdir.c fs_telldir.c fs_rewinddir.c fs_files.c \ fs_inode.c fs_inodefind.c fs_inodereserve.c fs_statfs.c \ fs_inoderemove.c fs_registerdriver.c fs_unregisterdriver.c \ fs_inodeaddref.c fs_inoderelease.c diff --git a/nuttx/fs/fs_ioctl.c b/nuttx/fs/fs_ioctl.c index ba81228c1..0d0889164 100644 --- a/nuttx/fs/fs_ioctl.c +++ b/nuttx/fs/fs_ioctl.c @@ -1,7 +1,7 @@ /**************************************************************************** * fs/fs_ioctl.c * - * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <spudmonkey@racsa.co.cr> * * Redistribution and use in source and binary forms, with or without @@ -14,7 +14,7 @@ * 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 + * 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. * @@ -42,9 +42,9 @@ ****************************************************************************/ #include <nuttx/config.h> + #include <sys/types.h> #include <sys/ioctl.h> - #include <sched.h> #include <errno.h> @@ -67,7 +67,7 @@ * Perform device specific operations. * * Parameters: - * fd Filt/socket descriptor of device + * fd File/socket descriptor of device * req The ioctl command * arg The argument of the ioctl cmd * @@ -94,7 +94,9 @@ int ioctl(int fd, int req, unsigned long arg) int err; #if CONFIG_NFILE_DESCRIPTORS > 0 FAR struct filelist *list; - int ret = OK; + FAR struct file *this_file; + FAR struct inode *inode; + int ret = OK; /* Did we get a valid file descriptor? */ @@ -126,25 +128,20 @@ int ioctl(int fd, int req, unsigned long arg) goto errout; } - /* Were we give a valid file descriptor? */ + /* Is a driver registered? Does it support the ioctl method? */ - if ((unsigned int)fd < CONFIG_NFILE_DESCRIPTORS) - { - FAR struct file *this_file = &list->fl_files[fd]; - struct inode *inode = this_file->f_inode; + this_file = &list->fl_files[fd]; + inode = this_file->f_inode; - /* Is a driver registered? Does it support the ioctl method? */ + if (inode && inode->u.i_ops && inode->u.i_ops->ioctl) + { + /* Yes, then let it perform the ioctl */ - if (inode && inode->u.i_ops && inode->u.i_ops->ioctl) + ret = (int)inode->u.i_ops->ioctl(this_file, req, arg); + if (ret < 0) { - /* Yes, then let it perform the ioctl */ - - ret = (int)inode->u.i_ops->ioctl(this_file, req, arg); - if (ret < 0) - { - err = -ret; - goto errout; - } + err = -ret; + goto errout; } } return ret; diff --git a/nuttx/fs/fs_lseek.c b/nuttx/fs/fs_lseek.c new file mode 100644 index 000000000..8131acf68 --- /dev/null +++ b/nuttx/fs/fs_lseek.c @@ -0,0 +1,179 @@ +/**************************************************************************** + * fs/fs_lseek.c + * + * Copyright (C) 2008 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 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Compilation Switches + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <unistd.h> +#include <sched.h> +#include <errno.h> + +#include "fs_internal.h" + +#if CONFIG_NFILE_DESCRIPTORS > 0 + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lseek + * + * Description: + * The lseek() function repositions the offset of the open file associated + * with the file descriptor fildes to the argument 'offset' according to the + * directive 'whence' as follows: + * + * SEEK_SET + * The offset is set to offset bytes. + * SEEK_CUR + * The offset is set to its current location plus offset bytes. + * SEEK_END + * The offset is set to the size of the file plus offset bytes. + * + * The lseek() function allows the file offset to be set beyond the end of the + * file (but this does not change the size of the file). If data is later written + * at this point, subsequent reads of the data in the gap (a "hole") return null + * bytes ('\0') until data is actually written into the gap. + * + * Parameters: + * fd File descriptor of device + * offset Defines the offset to position to + * whence Defines how to use offset + * + * Return: + * The resulting offset on success. -1 on failure withi errno set properly: + * + * EBADF fildes is not an open file descriptor. + * EINVAL whence is not one of SEEK_SET, SEEK_CUR, SEEK_END; or the + * resulting file offset would be negative, or beyond the end of a + * seekable device. + * EOVERFLOW The resulting file offset cannot be represented in an off_t. + * ESPIPE fildes is associated with a pipe, socket, or FIFO. + * + ****************************************************************************/ + +off_t lseek(int fd, off_t offset, int whence) +{ + FAR struct filelist *list; + FAR struct file *filep; + FAR struct inode *inode; + int err; + + /* Did we get a valid file descriptor? */ + + if ((unsigned int)fd >= CONFIG_NFILE_DESCRIPTORS) + { + err = EBADF; + goto errout; + } + + /* Get the thread-specific file list */ + + list = sched_getfiles(); + if (!list) + { + err = EMFILE; + goto errout; + } + + /* Is a driver registered? */ + + filep = &list->fl_files[fd]; + inode = filep->f_inode; + + if (inode && inode->u.i_ops) + { + /* Does it support the seek method */ + + if (inode->u.i_ops->seek) + { + /* Yes, then let it perform the seek */ + + err = (int)inode->u.i_ops->seek( filep, offset, whence); + if (err < 0) + { + err = -err; + goto errout; + } + } + else + { + /* No... there are a couple of default actions we can take */ + + switch (whence) + { + case SEEK_CUR: + offset += filep->f_pos; + + case SEEK_SET: + if (offset >= 0) + { + filep->f_pos = offset; /* Might be beyond the end-of-file */ + break; + } + else + { + err = EINVAL; + goto errout; + } + break; + + case SEEK_END: + err = ENOSYS; + goto errout; + + default: + err = EINVAL; + goto errout; + } + } + } + return filep->f_pos; + +errout: + *get_errno_ptr() = err; + return (off_t)ERROR; +} +#endif + |