int pipecommon_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct pipe_dev_s *dev = inode->i_private;
/* Only one command supported */
if (cmd == PIPEIOC_POLICY)
{
if (arg != 0)
{
PIPE_POLICY_1(dev->d_flags);
}
else
{
PIPE_POLICY_0(dev->d_flags);
}
return OK;
}
return -ENOTTY;
}
int pipecommon_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct pipe_dev_s *dev = inode->i_private;
int ret = -EINVAL;
#ifdef CONFIG_DEBUG
/* Some sanity checking */
if (dev == NULL)
{
return -EBADF;
}
#endif
pipecommon_semtake(&dev->d_bfsem);
switch (cmd)
{
case PIPEIOC_POLICY:
{
if (arg != 0)
{
PIPE_POLICY_1(dev->d_flags);
}
else
{
PIPE_POLICY_0(dev->d_flags);
}
ret = OK;
}
break;
case FIONREAD:
{
int count;
/* Determine the number of bytes available in the buffer */
if (dev->d_wrndx < dev->d_rdndx)
{
count = (CONFIG_DEV_PIPE_SIZE - dev->d_rdndx) + dev->d_wrndx;
}
else
{
count = dev->d_wrndx - dev->d_rdndx;
}
*(FAR int *)arg = count;
ret = 0;
}
break;
case FIONWRITE:
{
int count;
/* Determine the number of bytes free in the buffer */
if (dev->d_wrndx < dev->d_rdndx)
{
count = (dev->d_rdndx - dev->d_wrndx) - 1;
}
else
{
count = ((CONFIG_DEV_PIPE_SIZE - dev->d_wrndx) + dev->d_rdndx) - 1;
}
*(FAR int *)arg = count;
ret = 0;
}
break;
default:
break;
}
sem_post(&dev->d_bfsem);
return ret;
}
int pipecommon_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct pipe_dev_s *dev = inode->i_private;
int ret = -EINVAL;
#ifdef CONFIG_DEBUG_FEATURES
/* Some sanity checking */
if (dev == NULL)
{
return -EBADF;
}
#endif
pipecommon_semtake(&dev->d_bfsem);
switch (cmd)
{
case PIPEIOC_POLICY:
{
if (arg != 0)
{
PIPE_POLICY_1(dev->d_flags);
}
else
{
PIPE_POLICY_0(dev->d_flags);
}
ret = OK;
}
break;
case FIONWRITE: /* Number of bytes waiting in send queue */
case FIONREAD: /* Number of bytes available for reading */
{
int count;
/* Determine the number of bytes written to the buffer. This is,
* of course, also the number of bytes that may be read from the
* buffer.
*
* d_rdndx - index to remove next byte from the buffer
* d_wrndx - Index to next location to add a byte to the buffer.
*/
if (dev->d_wrndx < dev->d_rdndx)
{
count = (dev->d_bufsize - dev->d_rdndx) + dev->d_wrndx;
}
else
{
count = dev->d_wrndx - dev->d_rdndx;
}
*(FAR int *)((uintptr_t)arg) = count;
ret = 0;
}
break;
/* Free space in buffer */
case FIONSPACE:
{
int count;
/* Determine the number of bytes free in the buffer.
*
* d_rdndx - index to remove next byte from the buffer
* d_wrndx - Index to next location to add a byte to the buffer.
*/
if (dev->d_wrndx < dev->d_rdndx)
{
count = (dev->d_rdndx - dev->d_wrndx) - 1;
}
else
{
count = ((dev->d_bufsize - dev->d_wrndx) + dev->d_rdndx) - 1;
}
*(FAR int *)((uintptr_t)arg) = count;
ret = 0;
}
break;
default:
break;
}
sem_post(&dev->d_bfsem);
return ret;
}