diff options
Diffstat (limited to 'include/linux/tty.h')
| -rw-r--r-- | include/linux/tty.h | 78 |
1 files changed, 46 insertions, 32 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index e5d6b1f28823..19dc1097e09c 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -243,20 +243,29 @@ struct tty_port { #define TTY_PORT_KOPENED 5 /* device exclusively opened by kernel */ -/* - * Where all of the state associated with a tty is kept while the tty - * is open. Since the termios state should be kept even if the tty - * has been closed --- for things like the baud rate, etc --- it is - * not stored here, but rather a pointer to the real state is stored - * here. Possible the winsize structure should have the same - * treatment, but (1) the default 80x24 is usually right and (2) it's - * most often used by a windowing system, which will set the correct - * size each time the window is created or resized anyway. - * - TYT, 9/14/92 - */ - struct tty_operations; +/** + * struct tty_struct - state associated with a tty while open + * + * @flow.lock: lock for flow members + * @flow.stopped: tty stopped/started by tty_stop/tty_start + * @flow.tco_stopped: tty stopped/started by TCOOFF/TCOON ioctls (it has + * precedense over @flow.stopped) + * @flow.unused: alignment for Alpha, so that no members other than @flow.* are + * modified by the same 64b word store. The @flow's __aligned is + * there for the very same reason. + * @ctrl.lock: lock for ctrl members + * @ctrl.pgrp: process group of this tty (setpgrp(2)) + * @ctrl.session: session of this tty (setsid(2)). Writes are protected by both + * @ctrl.lock and legacy mutex, readers must use at least one of + * them. + * @ctrl.pktstatus: packet mode status (bitwise OR of TIOCPKT_* constants) + * @ctrl.packet: packet mode enabled + * + * All of the state associated with a tty while the tty is open. Persistent + * storage for tty devices is referenced here as @port in struct tty_port. + */ struct tty_struct { int magic; struct kref kref; @@ -274,27 +283,30 @@ struct tty_struct { struct mutex throttle_mutex; struct rw_semaphore termios_rwsem; struct mutex winsize_mutex; - spinlock_t ctrl_lock; - spinlock_t flow_lock; /* Termios values are protected by the termios rwsem */ struct ktermios termios, termios_locked; char name[64]; - struct pid *pgrp; /* Protected by ctrl lock */ - /* - * Writes protected by both ctrl lock and legacy mutex, readers must use - * at least one of them. - */ - struct pid *session; unsigned long flags; int count; struct winsize winsize; /* winsize_mutex */ - unsigned long stopped:1, /* flow_lock */ - flow_stopped:1, - unused:BITS_PER_LONG - 2; + + struct { + spinlock_t lock; + bool stopped; + bool tco_stopped; + unsigned long unused[0]; + } __aligned(sizeof(unsigned long)) flow; + + struct { + spinlock_t lock; + struct pid *pgrp; + struct pid *session; + unsigned char pktstatus; + bool packet; + unsigned long unused[0]; + } __aligned(sizeof(unsigned long)) ctrl; + int hw_stopped; - unsigned long ctrl_status:8, /* ctrl_lock */ - packet:1, - unused_ctrl:BITS_PER_LONG - 9; unsigned int receive_room; /* Bytes free for queue */ int flow_change; @@ -446,10 +458,9 @@ extern void tty_unregister_device(struct tty_driver *driver, unsigned index); extern void tty_write_message(struct tty_struct *tty, char *msg); extern int tty_send_xchar(struct tty_struct *tty, char ch); 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 unsigned int tty_chars_in_buffer(struct tty_struct *tty); +extern unsigned 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 tty_throttle_safe(struct tty_struct *tty); extern int tty_unthrottle_safe(struct tty_struct *tty); @@ -484,6 +495,9 @@ static inline speed_t tty_get_baud_rate(struct tty_struct *tty) return tty_termios_baud_rate(&tty->termios); } +unsigned char tty_get_char_size(unsigned int cflag); +unsigned char tty_get_frame_size(unsigned int cflag); + extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b); extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); @@ -624,11 +638,11 @@ static inline int tty_port_users(struct tty_port *port) return port->count + port->blocked_open; } -extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); -extern int tty_unregister_ldisc(int disc); +extern int tty_register_ldisc(struct tty_ldisc_ops *new_ldisc); +extern void tty_unregister_ldisc(struct tty_ldisc_ops *ldisc); extern int tty_set_ldisc(struct tty_struct *tty, int disc); extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p, - char *f, int count); + const char *f, int count); /* n_tty.c */ extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |