static void channel_transfer (channel_t *src)
{
src->flags &= ~FLAG_ACTIVITY;
pipe_t *p;
if (!(p = src->peer->tosend))
p = pipe_init();
src->peer->tosend = NULL;
int rc = splice(src->sock, 0, p->fd[1], 0, PIPE_SIZE,
SPLICE_F_MOVE|SPLICE_F_MORE|SPLICE_F_NONBLOCK);
if (rc == 0) {
src->events &= ~EPOLLIN;
src->flags |= FLAG_SHUT_RECV;
}
else if (rc < 0) {
src->events &= ~EPOLLIN;
if (errno != EAGAIN)
src->flags |= FLAG_ERRONEOUS;
} else {
p->load += rc;
}
if (p->load <= 0)
return pipe_release(&p);
src->peer->tosend = p;
return _pipe_resume(src->peer);
}
static int pipe_rdwr_release(struct inode * inode, struct file * filp)
{
if (filp->f_mode & FMODE_READ)
PIPE_READERS(*inode)--;
if (filp->f_mode & FMODE_WRITE)
PIPE_WRITERS(*inode)--;
return pipe_release(inode);
}
static void channel_patch (channel_t *c)
{
if (c->flags & FLAG_SHUT_RECV) {
c->events &= ~EPOLLIN;
channel_shut(c->peer);
if (c->tosend)
pipe_release(&c->tosend);
}
}
static int
pipe_rdwr_release(struct inode *inode, struct file *filp)
{
int decr, decw;
decr = (filp->f_mode & FMODE_READ) != 0;
decw = (filp->f_mode & FMODE_WRITE) != 0;
return pipe_release(inode, decr, decw);
}
static int IMFS_fifo_close(
rtems_libio_t *iop
)
{
int err = 0;
IMFS_jnode_t *jnode = iop->pathinfo.node_access;
pipe_release(&JNODE2PIPE(jnode), iop);
IMFS_FIFO_RETURN(err);
}
static void channel_shut (channel_t *chan)
{
if (chan->flags & FLAG_SHUT_SENT)
return;
if (chan->tosend)
return;
chan->flags |= FLAG_SHUT_SENT;
shutdown(chan->sock, SHUT_WR);
chan->events &= ~EPOLLOUT;
pipe_release(&chan->tosend);
}
static void channel_close (channel_t *chan)
{
if (chan->sock < 0)
return;
if (ISMONITORED(chan))
-- count_epoll;
close(chan->sock);
chan->sock = -1;
chan->flags = chan->events = 0;
pipe_release(&chan->tosend);
}
// Return a boolean value, FALSE if an error occured, TRUE if no socket
// error was met.
static void _pipe_resume (channel_t *chan)
{
pipe_t *p = chan->tosend;
chan->tosend = NULL;
while (p->load) {
int rc = splice(p->fd[0], 0, chan->sock, 0, p->load,
SPLICE_F_MOVE|SPLICE_F_MORE|SPLICE_F_NONBLOCK);
if (rc < 0) {
chan->events &= ~EPOLLOUT;
if (errno == EAGAIN)
chan->tosend = p;
else {
chan->flags |= FLAG_ERRONEOUS;
pipe_release(&p);
}
return;
}
p->load -= rc;
}
pipe_release(&p);
}
int IMFS_fifo_close(
epos_libio_t *iop
)
{
IMFS_jnode_t *jnode = iop->file_info;
int err = pipe_release(&JNODE2PIPE(jnode), iop);
if (! err) {
iop->flags &= ~LIBIO_FLAGS_OPEN;
/* Free jnode if file is already unlinked and no one opens it */
if (! epos_libio_is_file_open(jnode) && jnode->st_nlink < 1)
free(jnode);
}
IMFS_FIFO_RETURN(err);
}
/*
* Interface to file system open.
*
* *pipep points to pipe control structure. If called with *pipep = NULL,
* fifo_open will try allocating and initializing a control structure. If the
* call succeeds, *pipep will be set to address of new control structure.
*/
int fifo_open(
pipe_control_t **pipep,
rtems_libio_t *iop
)
{
pipe_control_t *pipe;
unsigned int prevCounter;
int err;
err = pipe_new(pipep);
if (err)
return err;
pipe = *pipep;
switch (LIBIO_ACCMODE(iop)) {
case LIBIO_FLAGS_READ:
pipe->readerCounter ++;
if (pipe->Readers ++ == 0)
PIPE_WAKEUPWRITERS(pipe);
if (pipe->Writers == 0) {
/* Not an error */
if (LIBIO_NODELAY(iop))
break;
prevCounter = pipe->writerCounter;
err = -EINTR;
/* Wait until a writer opens the pipe */
do {
PIPE_UNLOCK(pipe);
if (! PIPE_READWAIT(pipe))
goto out_error;
if (! PIPE_LOCK(pipe))
goto out_error;
} while (prevCounter == pipe->writerCounter);
}
break;
case LIBIO_FLAGS_WRITE:
pipe->writerCounter ++;
if (pipe->Writers ++ == 0)
PIPE_WAKEUPREADERS(pipe);
if (pipe->Readers == 0 && LIBIO_NODELAY(iop)) {
PIPE_UNLOCK(pipe);
err = -ENXIO;
goto out_error;
}
if (pipe->Readers == 0) {
prevCounter = pipe->readerCounter;
err = -EINTR;
do {
PIPE_UNLOCK(pipe);
if (! PIPE_WRITEWAIT(pipe))
goto out_error;
if (! PIPE_LOCK(pipe))
goto out_error;
} while (prevCounter == pipe->readerCounter);
}
break;
case LIBIO_FLAGS_READ_WRITE:
pipe->readerCounter ++;
if (pipe->Readers ++ == 0)
PIPE_WAKEUPWRITERS(pipe);
pipe->writerCounter ++;
if (pipe->Writers ++ == 0)
PIPE_WAKEUPREADERS(pipe);
break;
}
PIPE_UNLOCK(pipe);
return 0;
out_error:
pipe_release(pipep, iop);
return err;
}
static int
pipe_write_release(struct inode *inode, struct file *filp)
{
return pipe_release(inode, 0, 1);
}
static int
pipe_read_release(struct inode *inode, struct file *filp)
{
return pipe_release(inode, 1, 0);
}
static int
pipe_write_release(struct inode *inode, struct file *filp)
{
pipe_write_fasync(-1, filp, 0);
return pipe_release(inode, 0, 1);
}
static int
pipe_read_release(struct inode *inode, struct file *filp)
{
pipe_read_fasync(-1, filp, 0);
return pipe_release(inode, 1, 0);
}
static int pipe_write_release(struct inode * inode, struct file * filp)
{
PIPE_WRITERS(*inode)--;
return pipe_release(inode);
}
static int pipe_read_release(struct inode * inode, struct file * filp)
{
PIPE_READERS(*inode)--;
return pipe_release(inode);
}
