tty: add throttle/unthrottle helpers

[linux-2.6-omap-h63xx.git] / include / linux / tty.h

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 402de892b3edcdd0ae3bbf16892100e5c5570915..7f7121f9c9687a0e5692469b3ded0d082e5f0fb7 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -53,13 +53,6 @@
  */
 #define __DISABLED_CHAR '\0'
 
-/*
- * This is the flip buffer used for the tty driver.  The buffer is
- * located in the tty structure, and is used as a high speed interface
- * between the tty driver and the tty line discipline.
- */
-#define TTY_FLIPBUF_SIZE 512
-
 struct tty_buffer {
        struct tty_buffer *next;
        char *char_buf_ptr;
@@ -74,7 +67,6 @@ struct tty_buffer {
 
 struct tty_bufhead {
        struct delayed_work work;
-       struct semaphore pty_sem;
        spinlock_t lock;
        struct tty_buffer *head;        /* Queue head */
        struct tty_buffer *tail;        /* Active buffer */
@@ -185,27 +177,33 @@ struct signal_struct;
  * size each time the window is created or resized anyway.
  *                                             - TYT, 9/14/92
  */
+
+struct tty_operations;
+
 struct tty_struct {
        int     magic;
        struct tty_driver *driver;
+       const struct tty_operations *ops;
        int index;
        struct tty_ldisc ldisc;
        struct mutex termios_mutex;
+       spinlock_t ctrl_lock;
+       /* Termios values are protected by the termios mutex */
        struct ktermios *termios, *termios_locked;
        char name[64];
-       struct pid *pgrp;
+       struct pid *pgrp;               /* Protected by ctrl lock */
        struct pid *session;
        unsigned long flags;
        int count;
-       struct winsize winsize;
+       struct winsize winsize;         /* termios mutex */
        unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
        unsigned char low_latency:1, warned:1;
-       unsigned char ctrl_status;
+       unsigned char ctrl_status;      /* ctrl_lock */
        unsigned int receive_room;      /* Bytes free for queue */
 
        struct tty_struct *link;
        struct fasync_struct *fasync;
-       struct tty_bufhead buf;
+       struct tty_bufhead buf;         /* Locked internally */
        int alt_speed;          /* For magic substitution of 38400 bps */
        wait_queue_head_t write_wait;
        wait_queue_head_t read_wait;
@@ -219,6 +217,7 @@ struct tty_struct {
        /*
         * The following is data for the N_TTY line discipline.  For
         * historical reasons, this is included in the tty structure.
+        * Mostly locked by the BKL.
         */
        unsigned int column;
        unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
@@ -300,15 +299,21 @@ extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
                             int buflen);
 extern void tty_write_message(struct tty_struct *tty, char *msg);
+extern int tty_put_char(struct tty_struct *tty, unsigned char c);
+extern int tty_chars_in_buffer(struct tty_struct *tty);
+extern int tty_write_room(struct tty_struct *tty);
+extern void tty_driver_flush_buffer(struct tty_struct *tty);
+extern void tty_throttle(struct tty_struct *tty);
+extern void tty_unthrottle(struct tty_struct *tty);
 
 extern int is_current_pgrp_orphaned(void);
+extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 extern int is_ignored(int sig);
 extern int tty_signal(int sig, struct tty_struct *tty);
 extern void tty_hangup(struct tty_struct * tty);
 extern void tty_vhangup(struct tty_struct * tty);
 extern void tty_unhangup(struct file *filp);
 extern int tty_hung_up_p(struct file * filp);
-extern int is_tty(struct file *filp);
 extern void do_SAK(struct tty_struct *tty);
 extern void __do_SAK(struct tty_struct *tty);
 extern void disassociate_ctty(int priv);
@@ -332,8 +337,7 @@ extern void tty_ldisc_put(int);
 extern void tty_wakeup(struct tty_struct *tty);
 extern void tty_ldisc_flush(struct tty_struct *tty);
 
-extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-                    unsigned long arg);
+extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
                        unsigned int cmd, unsigned long arg);
 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
@@ -359,8 +363,7 @@ extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 extern void tty_audit_exit(void);
 extern void tty_audit_fork(struct signal_struct *sig);
 extern void tty_audit_push(struct tty_struct *tty);
-extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid);
-extern void tty_audit_opening(void);
+extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid);
 #else
 static inline void tty_audit_add_data(struct tty_struct *tty,
                                      unsigned char *data, size_t size)
@@ -375,10 +378,7 @@ static inline void tty_audit_fork(struct signal_struct *sig)
 static inline void tty_audit_push(struct tty_struct *tty)
 {
 }
-static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid)
-{
-}
-static inline void tty_audit_opening(void)
+static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid)
 {
 }
 #endif