static inline int fs_checkfd(FAR struct tcb_s *tcb, int fd, int oflags)
{
FAR struct file *filep;
FAR struct inode *inode;
int ret;
DEBUGASSERT(tcb && tcb->group);
/* Get the file structure corresponding to the file descriptor. */
ret = fs_getfilep(fd, &filep);
if (ret < 0)
{
return ret;
}
/* Get the inode associated with the file descriptor. This should
* normally be the case if fd >= 0. But not in the case where the
* called attempts to explicitly stdin with fdopen(0) but stdin has
* been closed.
*/
inode = filep->f_inode;
if (!inode)
{
/* No inode -- descriptor does not correspond to an open file */
return -ENOENT;
}
/* Make sure that the inode supports the requested access. In
* the case of fdopen, we are not actually creating the file -- in
* particular w and w+ do not truncate the file and any files have
* already been created.
*/
if (inode_checkflags(inode, oflags) != OK)
{
/* Cannot support the requested access */
return -EACCES;
}
/* Looks good to me */
return OK;
}
static inline int fs_checkfd(FAR _TCB *tcb, int fd, int oflags)
{
FAR struct filelist *flist;
FAR struct inode *inode;
/* Get the file list from the TCB */
flist = tcb->filelist;
/* Get the inode associated with the file descriptor. This should
* normally be the case if fd >= 0. But not in the case where the
* called attempts to explictly stdin with fdopen(0) but stdin has
* been closed.
*/
inode = flist->fl_files[fd].f_inode;
if (!inode)
{
/* No inode -- descriptor does not correspond to an open file */
return -ENOENT;
}
/* Make sure that the inode supports the requested access. In
* the case of fdopen, we are not actually creating the file -- in
* particular w and w+ do not truncate the file and any files have
* already been created.
*/
if (inode_checkflags(inode, oflags) != OK)
{
/* Cannot support the requested access */
return -EACCES;
}
/* Looks good to me */
return OK;
}
FAR struct file_struct *fs_fdopen(int fd, int oflags, FAR _TCB *tcb)
{
FAR struct filelist *flist;
FAR struct streamlist *slist;
FAR struct inode *inode;
FAR FILE *stream;
int err = OK;
int ret;
int i;
/* Check input parameters */
if (fd < 0)
{
err = EBADF;
goto errout;
}
/* A NULL TCB pointer means to use this threads TCB. This is a little
* hack the let's this function be called from user-space (via a syscall)
* without having access to the TCB.
*/
if (!tcb)
{
tcb = sched_self();
}
/* Get the file and stream list from the TCB */
flist = tcb->filelist;
slist = tcb->streams;
/* Get the inode associated with the file descriptor. This should
* normally be the case if fd >= 0. But not in the case where the
* called attempts to explictly stdin with fdopen(0) but stdin has
* been closed.
*/
inode = flist->fl_files[fd].f_inode;
if (!inode)
{
err = ENOENT;
goto errout;
}
/* Make sure that the inode supports the requested access. In
* the case of fdopen, we are not actually creating the file -- in
* particular w and w+ do not truncate the file and any files have
* already been created.
*/
if (inode_checkflags(inode, oflags) != OK)
{
err = EACCES;
goto errout;
}
/* Find an unallocated FILE structure */
ret = sem_wait(&slist->sl_sem);
if (ret != OK)
{
goto errout_with_errno;
}
for (i = 0 ; i < CONFIG_NFILE_STREAMS; i++)
{
stream = &slist->sl_streams[i];
if (stream->fs_filedes < 0)
{
/* Zero the structure */
#if CONFIG_STDIO_BUFFER_SIZE > 0
memset(stream, 0, sizeof(FILE));
#elif CONFIG_NUNGET_CHARS > 0
stream->fs_nungotten = 0;
#endif
#if CONFIG_STDIO_BUFFER_SIZE > 0
/* Initialize the semaphore the manages access to the buffer */
(void)sem_init(&stream->fs_sem, 0, 1);
/* Allocate the IO buffer */
stream->fs_bufstart = kmalloc(CONFIG_STDIO_BUFFER_SIZE);
if (!stream)
{
err = ENOMEM;
goto errout_with_sem;
}
/* Set up pointers */
stream->fs_bufend = &stream->fs_bufstart[CONFIG_STDIO_BUFFER_SIZE];
stream->fs_bufpos = stream->fs_bufstart;
stream->fs_bufpos = stream->fs_bufstart;
stream->fs_bufread = stream->fs_bufstart;
#endif
/* Save the file description and open flags. Setting the
* file descriptor locks this stream.
*/
stream->fs_filedes = fd;
stream->fs_oflags = oflags;
sem_post(&slist->sl_sem);
return stream;
}
}
#if CONFIG_STDIO_BUFFER_SIZE > 0
errout_with_sem:
#endif
sem_post(&slist->sl_sem);
errout:
set_errno(err);
errout_with_errno:
return NULL;
}
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;
}
int open(const char *path, int oflags, ...)
{
FAR struct file *filep;
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;
#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;
}
#if !defined(CONFIG_DISABLE_PSEUDOFS_OPERATIONS) && \
!defined(CONFIG_DISABLE_MOUNTPOINT)
/* If the inode is block driver, then we may return a character driver
* proxy for the block driver. block_proxy() will instantiate a BCH
* character driver wrapper around the block driver, open(), then
* unlink() the character driver. On success, block_proxy() will
* return the file descriptor of the opened character driver.
*
* NOTE: This will recurse to open the character driver proxy.
*/
if (INODE_IS_BLOCK(inode))
{
/* Release the inode reference */
inode_release(inode);
/* Get the file descriptor of the opened character driver proxy */
fd = block_proxy(path, oflags);
if (fd < 0)
{
ret = fd;
goto errout;
}
/* Return the file descriptor */
return fd;
}
else
#endif
/* Verify that the inode is either a "normal" character driver or a
* mountpoint. We specifically "special" inodes (semaphores, message
* queues, shared memory).
*/
#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;
}
/* Get the file structure corresponding to the file descriptor. */
filep = fs_getfilep(fd);
if (!filep)
{
/* The errno value has already been set */
return ERROR;
}
/* 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(filep, relpath, oflags, mode);
}
else
#endif
{
ret = inode->u.i_ops->open(filep);
}
}
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;
}
