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Subject[PATCH 06/10] ldisc n_tty: export all N_TTY ldisc methods.
Signed-off-by: Rodolfo Giometti <giometti@linux.it>
---
drivers/char/n_tty.c | 54 +++++++++++++++++++++++++++++--------------------
include/linux/tty.h | 16 ++++++++++++++
2 files changed, 48 insertions(+), 22 deletions(-)

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 708c2b1..10d037e 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -26,7 +26,7 @@
*
* 2002/03/18 Implemented n_tty_wakeup to send SIGIO POLL_OUTs to
* waiting writing processes-Sapan Bhatia <sapan@corewars.org>.
- * Also fixed a bug in BLOCKING mode where write_chan returns
+ * Also fixed a bug in BLOCKING mode where n_tty_write returns
* EAGAIN
*/

@@ -43,10 +43,10 @@
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/slab.h>
-#include <linux/poll.h>
#include <linux/bitops.h>
#include <linux/audit.h>
#include <linux/file.h>
+#include <linux/module.h>

#include <asm/uaccess.h>
#include <asm/system.h>
@@ -184,7 +184,7 @@ static void reset_buffer_flags(struct tty_struct *tty)
* Locking: ctrl_lock
*/

-static void n_tty_flush_buffer(struct tty_struct *tty)
+void n_tty_flush_buffer(struct tty_struct *tty)
{
unsigned long flags;
/* clear everything and unthrottle the driver */
@@ -200,6 +200,7 @@ static void n_tty_flush_buffer(struct tty_struct *tty)
}
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
}
+EXPORT_SYMBOL(n_tty_flush_buffer);

/**
* n_tty_chars_in_buffer - report available bytes
@@ -209,7 +210,7 @@ static void n_tty_flush_buffer(struct tty_struct *tty)
* at this instant in time.
*/

-static ssize_t n_tty_chars_in_buffer(struct tty_struct *tty)
+ssize_t n_tty_chars_in_buffer(struct tty_struct *tty)
{
unsigned long flags;
ssize_t n = 0;
@@ -225,6 +226,7 @@ static ssize_t n_tty_chars_in_buffer(struct tty_struct *tty)
spin_unlock_irqrestore(&tty->read_lock, flags);
return n;
}
+EXPORT_SYMBOL(n_tty_chars_in_buffer);

/**
* is_utf8_continuation - utf8 multibyte check
@@ -346,7 +348,7 @@ static int opost(unsigned char c, struct tty_struct *tty)
* the simple cases normally found and helps to generate blocks of
* symbols for the console driver and thus improve performance.
*
- * Called from write_chan under the tty layer write lock. Relies
+ * Called from n_tty_write under the tty layer write lock. Relies
* on lock_kernel for the tty->column state.
*/

@@ -895,13 +897,14 @@ handle_newline:
* IO must be woken up
*/

-static void n_tty_write_wakeup(struct tty_struct *tty)
+void n_tty_write_wakeup(struct tty_struct *tty)
{
if (tty->fasync) {
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
}
}
+EXPORT_SYMBOL(n_tty_write_wakeup);

/**
* n_tty_receive_buf - data receive
@@ -916,7 +919,7 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
* calls one at a time and in order (or using flush_to_ldisc)
*/

-static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
char *fp, int count)
{
const unsigned char *p;
@@ -990,6 +993,7 @@ static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
if (tty->receive_room < TTY_THRESHOLD_THROTTLE)
tty_throttle(tty);
}
+EXPORT_SYMBOL(n_tty_receive_buf);

int is_ignored(int sig)
{
@@ -1009,7 +1013,7 @@ int is_ignored(int sig)
* when the ldisc is closed.
*/

-static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
+void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
{
if (!tty)
return;
@@ -1076,6 +1080,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
wake_up_interruptible(&tty->write_wait);
wake_up_interruptible(&tty->read_wait);
}
+EXPORT_SYMBOL(n_tty_set_termios);

/**
* n_tty_close - close the ldisc for this tty
@@ -1087,7 +1092,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
* ldisc methods are in progress.
*/

-static void n_tty_close(struct tty_struct *tty)
+void n_tty_close(struct tty_struct *tty)
{
n_tty_flush_buffer(tty);
if (tty->read_buf) {
@@ -1095,6 +1100,7 @@ static void n_tty_close(struct tty_struct *tty)
tty->read_buf = NULL;
}
}
+EXPORT_SYMBOL(n_tty_close);

/**
* n_tty_open - open an ldisc
@@ -1106,7 +1112,7 @@ static void n_tty_close(struct tty_struct *tty)
* until a close.
*/

-static int n_tty_open(struct tty_struct *tty)
+int n_tty_open(struct tty_struct *tty)
{
if (!tty)
return -EINVAL;
@@ -1125,6 +1131,7 @@ static int n_tty_open(struct tty_struct *tty)
tty->closing = 0;
return 0;
}
+EXPORT_SYMBOL(n_tty_open);

static inline int input_available_p(struct tty_struct *tty, int amt)
{
@@ -1143,7 +1150,7 @@ static inline int input_available_p(struct tty_struct *tty, int amt)
* @b: user data
* @nr: size of data
*
- * Helper function to speed up read_chan. It is only called when
+ * Helper function to speed up n_tty_read. It is only called when
* ICANON is off; it copies characters straight from the tty queue to
* user space directly. It can be profitably called twice; once to
* drain the space from the tail pointer to the (physical) end of the
@@ -1210,7 +1217,7 @@ static int job_control(struct tty_struct *tty, struct file *file)
if (file->f_op->write != redirected_tty_write &&
current->signal->tty == tty) {
if (!tty->pgrp)
- printk(KERN_ERR "read_chan: no tty->pgrp!\n");
+ printk(KERN_ERR "n_tty_read: no tty->pgrp!\n");
else if (task_pgrp(current) != tty->pgrp) {
if (is_ignored(SIGTTIN) ||
is_current_pgrp_orphaned())
@@ -1225,7 +1232,7 @@ static int job_control(struct tty_struct *tty, struct file *file)


/**
- * read_chan - read function for tty
+ * n_tty_read - read function for tty
* @tty: tty device
* @file: file object
* @buf: userspace buffer pointer
@@ -1239,7 +1246,7 @@ static int job_control(struct tty_struct *tty, struct file *file)
* This code must be sure never to sleep through a hangup.
*/

-static ssize_t read_chan(struct tty_struct *tty, struct file *file,
+ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
unsigned char __user *buf, size_t nr)
{
unsigned char __user *b = buf;
@@ -1255,7 +1262,7 @@ static ssize_t read_chan(struct tty_struct *tty, struct file *file,
do_it_again:

if (!tty->read_buf) {
- printk(KERN_ERR "n_tty_read_chan: read_buf == NULL?!?\n");
+ printk(KERN_ERR "n_tty_read: read_buf == NULL?!?\n");
return -EIO;
}

@@ -1442,9 +1449,10 @@ do_it_again:
n_tty_set_room(tty);
return retval;
}
+EXPORT_SYMBOL(n_tty_read);

/**
- * write_chan - write function for tty
+ * n_tty_write - write function for tty
* @tty: tty device
* @file: file object
* @buf: userspace buffer pointer
@@ -1458,7 +1466,7 @@ do_it_again:
* This code must be sure never to sleep through a hangup.
*/

-static ssize_t write_chan(struct tty_struct *tty, struct file *file,
+ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
const unsigned char *buf, size_t nr)
{
const unsigned char *b = buf;
@@ -1530,9 +1538,10 @@ break_out:
remove_wait_queue(&tty->write_wait, &wait);
return (b - buf) ? b - buf : retval;
}
+EXPORT_SYMBOL(n_tty_write);

/**
- * normal_poll - poll method for N_TTY
+ * n_tty_poll - poll method for N_TTY
* @tty: terminal device
* @file: file accessing it
* @wait: poll table
@@ -1545,7 +1554,7 @@ break_out:
* Called without the kernel lock held - fine
*/

-static unsigned int normal_poll(struct tty_struct *tty, struct file *file,
+unsigned int n_tty_poll(struct tty_struct *tty, struct file *file,
poll_table *wait)
{
unsigned int mask = 0;
@@ -1572,6 +1581,7 @@ static unsigned int normal_poll(struct tty_struct *tty, struct file *file,
mask |= POLLOUT | POLLWRNORM;
return mask;
}
+EXPORT_SYMBOL(n_tty_poll);

struct tty_ldisc_ops tty_ldisc_N_TTY = {
.magic = TTY_LDISC_MAGIC,
@@ -1580,11 +1590,11 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
.close = n_tty_close,
.flush_buffer = n_tty_flush_buffer,
.chars_in_buffer = n_tty_chars_in_buffer,
- .read = read_chan,
- .write = write_chan,
+ .read = n_tty_read,
+ .write = n_tty_write,
.ioctl = n_tty_ioctl,
.set_termios = n_tty_set_termios,
- .poll = normal_poll,
+ .poll = n_tty_poll,
.receive_buf = n_tty_receive_buf,
.write_wakeup = n_tty_write_wakeup
};
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 0cbec74..826d695 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -13,6 +13,7 @@
#include <linux/tty_driver.h>
#include <linux/tty_ldisc.h>
#include <linux/mutex.h>
+#include <linux/poll.h>

#include <asm/system.h>

@@ -393,6 +394,21 @@ extern void tty_ldisc_begin(void);
/* This last one is just for the tty layer internals and shouldn't be used elsewhere */
extern void tty_ldisc_enable(struct tty_struct *tty);

+extern void n_tty_flush_buffer(struct tty_struct *tty);
+extern ssize_t n_tty_chars_in_buffer(struct tty_struct *tty);
+extern void n_tty_write_wakeup(struct tty_struct *tty);
+extern void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+ char *fp, int count);
+extern void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old);
+extern void n_tty_close(struct tty_struct *tty);
+extern int n_tty_open(struct tty_struct *tty);
+extern ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
+ unsigned char __user *buf, size_t nr);
+extern ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
+ const unsigned char *buf, size_t nr);
+extern unsigned int n_tty_poll(struct tty_struct *tty, struct file *file,
+ poll_table *wait);
+

/* n_tty.c */
extern struct tty_ldisc_ops tty_ldisc_N_TTY;
--
1.5.4.3


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