int read_command; /* ccw command to use for reads. */
int write_command; /* ccw command to use for writes. */
int attention; /* Got attention. */
- struct raw3270_request *clear; /* single clear request. */
- wait_queue_head_t attn_wait; /* Attention wait queue. */
+ int active; /* Fullscreen view is active. */
+ struct raw3270_request *init; /* single init request. */
+ wait_queue_head_t wait; /* Init & attention wait queue. */
+ struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */
+ size_t rdbuf_size; /* size of data returned by RDBUF */
};
static void
wake_up((wait_queue_head_t *) data);
}
+static inline int
+fs3270_working(struct fs3270 *fp)
+{
+ /*
+ * The fullscreen view is in working order if the view
+ * has been activated AND the initial request is finished.
+ */
+ return fp->active && raw3270_request_final(fp->init);
+}
+
static int
fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq)
{
- wait_queue_head_t wq;
+ struct fs3270 *fp;
int rc;
- init_waitqueue_head(&wq);
+ fp = (struct fs3270 *) view;
rq->callback = fs3270_wake_up;
- rq->callback_data = &wq;
- rc = raw3270_start(view, rq);
- if (rc)
- return rc;
- /* Started sucessfully. Now wait for completion. */
- wait_event(wq, raw3270_request_final(rq));
- return rq->rc;
+ rq->callback_data = &fp->wait;
+
+ do {
+ if (!fs3270_working(fp)) {
+ /* Fullscreen view isn't ready yet. */
+ rc = wait_event_interruptible(fp->wait,
+ fs3270_working(fp));
+ if (rc != 0)
+ break;
+ }
+ rc = raw3270_start(view, rq);
+ if (rc == 0) {
+ /* Started sucessfully. Now wait for completion. */
+ wait_event(fp->wait, raw3270_request_final(rq));
+ }
+ } while (rc == -EACCES);
+ return rc;
}
+/*
+ * Switch to the fullscreen view.
+ */
static void
fs3270_reset_callback(struct raw3270_request *rq, void *data)
{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) rq->view;
raw3270_request_reset(rq);
+ wake_up(&fp->wait);
+}
+
+static void
+fs3270_restore_callback(struct raw3270_request *rq, void *data)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) rq->view;
+ if (rq->rc != 0 || rq->rescnt != 0) {
+ if (fp->fs_pid)
+ kill_proc(fp->fs_pid, SIGHUP, 1);
+ }
+ fp->rdbuf_size = 0;
+ raw3270_request_reset(rq);
+ wake_up(&fp->wait);
}
-/*
- * Switch to the fullscreen view.
- */
static int
fs3270_activate(struct raw3270_view *view)
{
struct fs3270 *fp;
+ char *cp;
+ int rc;
fp = (struct fs3270 *) view;
- raw3270_request_set_cmd(fp->clear, TC_EWRITEA);
- fp->clear->callback = fs3270_reset_callback;
- return raw3270_start(view, fp->clear);
+
+ /* If an old init command is still running just return. */
+ if (!raw3270_request_final(fp->init))
+ return 0;
+
+ if (fp->rdbuf_size == 0) {
+ /* No saved buffer. Just clear the screen. */
+ raw3270_request_set_cmd(fp->init, TC_EWRITEA);
+ fp->init->callback = fs3270_reset_callback;
+ } else {
+ /* Restore fullscreen buffer saved by fs3270_deactivate. */
+ raw3270_request_set_cmd(fp->init, TC_EWRITEA);
+ raw3270_request_set_idal(fp->init, fp->rdbuf);
+ fp->init->ccw.count = fp->rdbuf_size;
+ cp = fp->rdbuf->data[0];
+ cp[0] = TW_KR;
+ cp[1] = TO_SBA;
+ cp[2] = cp[6];
+ cp[3] = cp[7];
+ cp[4] = TO_IC;
+ cp[5] = TO_SBA;
+ cp[6] = 0x40;
+ cp[7] = 0x40;
+ fp->init->rescnt = 0;
+ fp->init->callback = fs3270_restore_callback;
+ }
+ rc = fp->init->rc = raw3270_start_locked(view, fp->init);
+ if (rc)
+ fp->init->callback(fp->init, NULL);
+ else
+ fp->active = 1;
+ return rc;
}
/*
* Shutdown fullscreen view.
*/
+static void
+fs3270_save_callback(struct raw3270_request *rq, void *data)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) rq->view;
+
+ /* Correct idal buffer element 0 address. */
+ fp->rdbuf->data[0] -= 5;
+ fp->rdbuf->size += 5;
+
+ /*
+ * If the rdbuf command failed or the idal buffer is
+ * to small for the amount of data returned by the
+ * rdbuf command, then we have no choice but to send
+ * a SIGHUP to the application.
+ */
+ if (rq->rc != 0 || rq->rescnt == 0) {
+ if (fp->fs_pid)
+ kill_proc(fp->fs_pid, SIGHUP, 1);
+ fp->rdbuf_size = 0;
+ } else
+ fp->rdbuf_size = fp->rdbuf->size - rq->rescnt;
+ raw3270_request_reset(rq);
+ wake_up(&fp->wait);
+}
+
static void
fs3270_deactivate(struct raw3270_view *view)
{
- // FIXME: is this a good idea? The user program using fullscreen 3270
- // will die just because a console message appeared. On the other
- // hand the fullscreen device is unoperational now.
struct fs3270 *fp;
fp = (struct fs3270 *) view;
- if (fp->fs_pid != 0)
- kill_proc(fp->fs_pid, SIGHUP, 1);
- fp->fs_pid = 0;
+ fp->active = 0;
+
+ /* If an old init command is still running just return. */
+ if (!raw3270_request_final(fp->init))
+ return;
+
+ /* Prepare read-buffer request. */
+ raw3270_request_set_cmd(fp->init, TC_RDBUF);
+ /*
+ * Hackish: skip first 5 bytes of the idal buffer to make
+ * room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence
+ * in the activation command.
+ */
+ fp->rdbuf->data[0] += 5;
+ fp->rdbuf->size -= 5;
+ raw3270_request_set_idal(fp->init, fp->rdbuf);
+ fp->init->rescnt = 0;
+ fp->init->callback = fs3270_save_callback;
+
+ /* Start I/O to read in the 3270 buffer. */
+ fp->init->rc = raw3270_start_locked(view, fp->init);
+ if (fp->init->rc)
+ fp->init->callback(fp->init, NULL);
}
static int
/* Handle ATTN. Set indication and wake waiters for attention. */
if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
fp->attention = 1;
- wake_up(&fp->attn_wait);
+ wake_up(&fp->wait);
}
if (rq) {
struct fs3270 *fp;
struct raw3270_request *rq;
struct idal_buffer *ib;
- int rc;
+ ssize_t rc;
if (count == 0 || count > 65535)
return -EINVAL;
if (!fp)
return -ENODEV;
ib = idal_buffer_alloc(count, 0);
- if (!ib)
+ if (IS_ERR(ib))
return -ENOMEM;
rq = raw3270_request_alloc(0);
if (!IS_ERR(rq)) {
fp->read_command = 6;
raw3270_request_set_cmd(rq, fp->read_command ? : 2);
raw3270_request_set_idal(rq, ib);
- wait_event(fp->attn_wait, fp->attention);
- rc = fs3270_do_io(&fp->view, rq);
- if (rc == 0 && idal_buffer_to_user(ib, data, count))
- rc = -EFAULT;
+ rc = wait_event_interruptible(fp->wait, fp->attention);
+ fp->attention = 0;
+ if (rc == 0) {
+ rc = fs3270_do_io(&fp->view, rq);
+ if (rc == 0) {
+ count -= rq->rescnt;
+ if (idal_buffer_to_user(ib, data, count) != 0)
+ rc = -EFAULT;
+ else
+ rc = count;
+
+ }
+ }
raw3270_request_free(rq);
} else
rc = PTR_ERR(rq);
struct raw3270_request *rq;
struct idal_buffer *ib;
int write_command;
- int rc;
+ ssize_t rc;
fp = filp->private_data;
if (!fp)
return -ENODEV;
ib = idal_buffer_alloc(count, 0);
- if (!ib)
+ if (IS_ERR(ib))
return -ENOMEM;
rq = raw3270_request_alloc(0);
if (!IS_ERR(rq)) {
raw3270_request_set_cmd(rq, write_command);
raw3270_request_set_idal(rq, ib);
rc = fs3270_do_io(&fp->view, rq);
+ if (rc == 0)
+ rc = count - rq->rescnt;
} else
rc = -EFAULT;
raw3270_request_free(rq);
/*
* process ioctl commands for the tube driver
*/
-static int
-fs3270_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
+static long
+fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct fs3270 *fp;
struct raw3270_iocb iocb;
if (!fp)
return -ENODEV;
rc = 0;
+ lock_kernel();
switch (cmd) {
case TUBICMD:
fp->read_command = arg;
rc = -EFAULT;
break;
}
+ unlock_kernel();
return rc;
}
/*
- * Allocate tty3270 structure.
+ * Allocate fs3270 structure.
*/
static struct fs3270 *
fs3270_alloc_view(void)
{
struct fs3270 *fp;
- fp = (struct fs3270 *) kmalloc(sizeof(struct fs3270),GFP_KERNEL);
+ fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL);
if (!fp)
return ERR_PTR(-ENOMEM);
- memset(fp, 0, sizeof(struct fs3270));
- fp->clear = raw3270_request_alloc(0);
- if (!IS_ERR(fp->clear)) {
+ fp->init = raw3270_request_alloc(0);
+ if (IS_ERR(fp->init)) {
kfree(fp);
return ERR_PTR(-ENOMEM);
}
}
/*
- * Free tty3270 structure.
+ * Free fs3270 structure.
*/
static void
fs3270_free_view(struct raw3270_view *view)
{
- raw3270_request_free(((struct fs3270 *) view)->clear);
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) view;
+ if (fp->rdbuf)
+ idal_buffer_free(fp->rdbuf);
+ raw3270_request_free(((struct fs3270 *) view)->init);
kfree(view);
}
fs3270_open(struct inode *inode, struct file *filp)
{
struct fs3270 *fp;
+ struct idal_buffer *ib;
int minor, rc;
if (imajor(filp->f_dentry->d_inode) != IBM_FS3270_MAJOR)
return -ENODEV;
minor = iminor(filp->f_dentry->d_inode);
+ /* Check for minor 0 multiplexer. */
+ if (minor == 0) {
+ if (!current->signal->tty)
+ return -ENODEV;
+ if (current->signal->tty->driver->major != IBM_TTY3270_MAJOR)
+ return -ENODEV;
+ minor = current->signal->tty->index + RAW3270_FIRSTMINOR;
+ }
/* Check if some other program is already using fullscreen mode. */
fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
if (!IS_ERR(fp)) {
if (IS_ERR(fp))
return PTR_ERR(fp);
- init_waitqueue_head(&fp->attn_wait);
+ init_waitqueue_head(&fp->wait);
fp->fs_pid = current->pid;
rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
if (rc) {
return rc;
}
+ /* Allocate idal-buffer. */
+ ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0);
+ if (IS_ERR(ib)) {
+ raw3270_put_view(&fp->view);
+ raw3270_del_view(&fp->view);
+ return PTR_ERR(fp);
+ }
+ fp->rdbuf = ib;
+
rc = raw3270_activate_view(&fp->view);
if (rc) {
+ raw3270_put_view(&fp->view);
raw3270_del_view(&fp->view);
return rc;
}
fp = filp->private_data;
filp->private_data = 0;
- if (fp)
+ if (fp) {
+ fp->fs_pid = 0;
+ raw3270_reset(&fp->view);
+ raw3270_put_view(&fp->view);
raw3270_del_view(&fp->view);
+ }
return 0;
}
static struct file_operations fs3270_fops = {
- .owner = THIS_MODULE, /* owner */
- .read = fs3270_read, /* read */
- .write = fs3270_write, /* write */
- .ioctl = fs3270_ioctl, /* ioctl */
- .open = fs3270_open, /* open */
- .release = fs3270_close, /* release */
+ .owner = THIS_MODULE, /* owner */
+ .read = fs3270_read, /* read */
+ .write = fs3270_write, /* write */
+ .unlocked_ioctl = fs3270_ioctl, /* ioctl */
+ .compat_ioctl = fs3270_ioctl, /* ioctl */
+ .open = fs3270_open, /* open */
+ .release = fs3270_close, /* release */
};
/*
git://git.onelab.eu / linux-2.6.git / blobdiff