430 lines
14 KiB
C
430 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TTY_H
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#define _LINUX_TTY_H
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#include <linux/fs.h>
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#include <linux/major.h>
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#include <linux/termios.h>
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#include <linux/workqueue.h>
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#include <linux/tty_buffer.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_ldisc.h>
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#include <linux/tty_port.h>
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#include <linux/mutex.h>
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#include <linux/tty_flags.h>
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#include <uapi/linux/tty.h>
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#include <linux/rwsem.h>
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#include <linux/llist.h>
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/*
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* (Note: the *_driver.minor_start values 1, 64, 128, 192 are
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* hardcoded at present.)
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*/
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#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
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#define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
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#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
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/*
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* This character is the same as _POSIX_VDISABLE: it cannot be used as
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* a c_cc[] character, but indicates that a particular special character
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* isn't in use (eg VINTR has no character etc)
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*/
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#define __DISABLED_CHAR '\0'
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#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
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#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
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#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
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#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
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#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
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#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
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#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
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#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
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#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
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#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
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#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
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#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
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#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
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#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
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#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
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#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
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#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
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#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
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#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
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#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
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#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
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#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
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#define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
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#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
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#define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
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#define I_INPCK(tty) _I_FLAG((tty), INPCK)
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#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
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#define I_INLCR(tty) _I_FLAG((tty), INLCR)
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#define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
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#define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
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#define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
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#define I_IXON(tty) _I_FLAG((tty), IXON)
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#define I_IXANY(tty) _I_FLAG((tty), IXANY)
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#define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
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#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
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#define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
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#define O_OPOST(tty) _O_FLAG((tty), OPOST)
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#define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
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#define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
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#define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
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#define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
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#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
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#define O_OFILL(tty) _O_FLAG((tty), OFILL)
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#define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
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#define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
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#define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
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#define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
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#define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
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#define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
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#define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
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#define C_BAUD(tty) _C_FLAG((tty), CBAUD)
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#define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
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#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
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#define C_CREAD(tty) _C_FLAG((tty), CREAD)
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#define C_PARENB(tty) _C_FLAG((tty), PARENB)
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#define C_PARODD(tty) _C_FLAG((tty), PARODD)
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#define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
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#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
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#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
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#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
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#define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
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#define L_ISIG(tty) _L_FLAG((tty), ISIG)
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#define L_ICANON(tty) _L_FLAG((tty), ICANON)
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#define L_XCASE(tty) _L_FLAG((tty), XCASE)
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#define L_ECHO(tty) _L_FLAG((tty), ECHO)
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#define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
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#define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
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#define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
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#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
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#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
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#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
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#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
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#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
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#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
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#define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
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#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
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#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
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struct device;
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struct signal_struct;
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struct tty_operations;
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/**
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* struct tty_struct - state associated with a tty while open
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*
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* @flow.lock: lock for flow members
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* @flow.stopped: tty stopped/started by tty_stop/tty_start
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* @flow.tco_stopped: tty stopped/started by TCOOFF/TCOON ioctls (it has
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* precedense over @flow.stopped)
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* @flow.unused: alignment for Alpha, so that no members other than @flow.* are
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* modified by the same 64b word store. The @flow's __aligned is
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* there for the very same reason.
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* @ctrl.lock: lock for ctrl members
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* @ctrl.pgrp: process group of this tty (setpgrp(2))
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* @ctrl.session: session of this tty (setsid(2)). Writes are protected by both
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* @ctrl.lock and legacy mutex, readers must use at least one of
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* them.
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* @ctrl.pktstatus: packet mode status (bitwise OR of TIOCPKT_* constants)
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* @ctrl.packet: packet mode enabled
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*
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* All of the state associated with a tty while the tty is open. Persistent
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* storage for tty devices is referenced here as @port in struct tty_port.
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*/
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struct tty_struct {
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int magic;
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struct kref kref;
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struct device *dev; /* class device or NULL (e.g. ptys, serdev) */
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struct tty_driver *driver;
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const struct tty_operations *ops;
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int index;
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/* Protects ldisc changes: Lock tty not pty */
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struct ld_semaphore ldisc_sem;
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struct tty_ldisc *ldisc;
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struct mutex atomic_write_lock;
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struct mutex legacy_mutex;
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struct mutex throttle_mutex;
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struct rw_semaphore termios_rwsem;
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struct mutex winsize_mutex;
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/* Termios values are protected by the termios rwsem */
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struct ktermios termios, termios_locked;
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char name[64];
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unsigned long flags;
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int count;
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struct winsize winsize; /* winsize_mutex */
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struct {
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spinlock_t lock;
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bool stopped;
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bool tco_stopped;
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unsigned long unused[0];
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} __aligned(sizeof(unsigned long)) flow;
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struct {
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spinlock_t lock;
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struct pid *pgrp;
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struct pid *session;
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unsigned char pktstatus;
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bool packet;
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unsigned long unused[0];
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} __aligned(sizeof(unsigned long)) ctrl;
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int hw_stopped;
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unsigned int receive_room; /* Bytes free for queue */
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int flow_change;
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struct tty_struct *link;
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struct fasync_struct *fasync;
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wait_queue_head_t write_wait;
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wait_queue_head_t read_wait;
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struct work_struct hangup_work;
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void *disc_data;
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void *driver_data;
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spinlock_t files_lock; /* protects tty_files list */
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struct list_head tty_files;
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#define N_TTY_BUF_SIZE 4096
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int closing;
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unsigned char *write_buf;
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int write_cnt;
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/* If the tty has a pending do_SAK, queue it here - akpm */
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struct work_struct SAK_work;
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struct tty_port *port;
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} __randomize_layout;
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/* Each of a tty's open files has private_data pointing to tty_file_private */
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struct tty_file_private {
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struct tty_struct *tty;
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struct file *file;
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struct list_head list;
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};
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/* tty magic number */
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#define TTY_MAGIC 0x5401
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/*
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* These bits are used in the flags field of the tty structure.
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*
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* So that interrupts won't be able to mess up the queues,
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* copy_to_cooked must be atomic with respect to itself, as must
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* tty->write. Thus, you must use the inline functions set_bit() and
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* clear_bit() to make things atomic.
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*/
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#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
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#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
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#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
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#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
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#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
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#define TTY_LDISC_OPEN 11 /* Line discipline is open */
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#define TTY_PTY_LOCK 16 /* pty private */
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#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
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#define TTY_HUPPED 18 /* Post driver->hangup() */
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#define TTY_HUPPING 19 /* Hangup in progress */
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#define TTY_LDISC_CHANGING 20 /* Change pending - non-block IO */
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#define TTY_LDISC_HALTED 22 /* Line discipline is halted */
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static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file)
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{
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return file->f_flags & O_NONBLOCK ||
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test_bit(TTY_LDISC_CHANGING, &tty->flags);
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}
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static inline bool tty_io_error(struct tty_struct *tty)
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{
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return test_bit(TTY_IO_ERROR, &tty->flags);
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}
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static inline bool tty_throttled(struct tty_struct *tty)
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{
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return test_bit(TTY_THROTTLED, &tty->flags);
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}
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#ifdef CONFIG_TTY
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void tty_kref_put(struct tty_struct *tty);
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struct pid *tty_get_pgrp(struct tty_struct *tty);
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void tty_vhangup_self(void);
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void disassociate_ctty(int priv);
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dev_t tty_devnum(struct tty_struct *tty);
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void proc_clear_tty(struct task_struct *p);
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struct tty_struct *get_current_tty(void);
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/* tty_io.c */
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int __init tty_init(void);
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const char *tty_name(const struct tty_struct *tty);
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struct tty_struct *tty_kopen_exclusive(dev_t device);
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struct tty_struct *tty_kopen_shared(dev_t device);
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void tty_kclose(struct tty_struct *tty);
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int tty_dev_name_to_number(const char *name, dev_t *number);
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#else
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static inline void tty_kref_put(struct tty_struct *tty)
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{ }
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static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
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{ return NULL; }
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static inline void tty_vhangup_self(void)
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{ }
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static inline void disassociate_ctty(int priv)
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{ }
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static inline dev_t tty_devnum(struct tty_struct *tty)
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{ return 0; }
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static inline void proc_clear_tty(struct task_struct *p)
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{ }
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static inline struct tty_struct *get_current_tty(void)
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{ return NULL; }
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/* tty_io.c */
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static inline int __init tty_init(void)
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{ return 0; }
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static inline const char *tty_name(const struct tty_struct *tty)
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{ return "(none)"; }
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static inline struct tty_struct *tty_kopen_exclusive(dev_t device)
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{ return ERR_PTR(-ENODEV); }
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static inline void tty_kclose(struct tty_struct *tty)
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{ }
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static inline int tty_dev_name_to_number(const char *name, dev_t *number)
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{ return -ENOTSUPP; }
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#endif
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extern struct ktermios tty_std_termios;
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int vcs_init(void);
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extern struct class *tty_class;
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/**
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* tty_kref_get - get a tty reference
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* @tty: tty device
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*
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* Return a new reference to a tty object. The caller must hold
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* sufficient locks/counts to ensure that their existing reference cannot
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* go away
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*/
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static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
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{
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if (tty)
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kref_get(&tty->kref);
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return tty;
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}
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const char *tty_driver_name(const struct tty_struct *tty);
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void tty_wait_until_sent(struct tty_struct *tty, long timeout);
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void stop_tty(struct tty_struct *tty);
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void start_tty(struct tty_struct *tty);
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void tty_write_message(struct tty_struct *tty, char *msg);
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int tty_send_xchar(struct tty_struct *tty, char ch);
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int tty_put_char(struct tty_struct *tty, unsigned char c);
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unsigned int tty_chars_in_buffer(struct tty_struct *tty);
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unsigned int tty_write_room(struct tty_struct *tty);
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void tty_driver_flush_buffer(struct tty_struct *tty);
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void tty_unthrottle(struct tty_struct *tty);
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int tty_throttle_safe(struct tty_struct *tty);
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int tty_unthrottle_safe(struct tty_struct *tty);
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int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
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int tty_get_icount(struct tty_struct *tty,
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struct serial_icounter_struct *icount);
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int is_current_pgrp_orphaned(void);
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void tty_hangup(struct tty_struct *tty);
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void tty_vhangup(struct tty_struct *tty);
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int tty_hung_up_p(struct file *filp);
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void do_SAK(struct tty_struct *tty);
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void __do_SAK(struct tty_struct *tty);
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void no_tty(void);
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speed_t tty_termios_baud_rate(struct ktermios *termios);
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void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud,
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speed_t obaud);
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void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud,
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speed_t obaud);
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/**
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* tty_get_baud_rate - get tty bit rates
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* @tty: tty to query
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*
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* Returns the baud rate as an integer for this terminal. The
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* termios lock must be held by the caller and the terminal bit
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* flags may be updated.
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*
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* Locking: none
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*/
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static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
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{
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return tty_termios_baud_rate(&tty->termios);
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}
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unsigned char tty_get_char_size(unsigned int cflag);
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unsigned char tty_get_frame_size(unsigned int cflag);
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void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
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int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
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int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
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void tty_wakeup(struct tty_struct *tty);
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int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
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int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
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struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
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void tty_release_struct(struct tty_struct *tty, int idx);
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void tty_init_termios(struct tty_struct *tty);
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void tty_save_termios(struct tty_struct *tty);
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int tty_standard_install(struct tty_driver *driver,
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struct tty_struct *tty);
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extern struct mutex tty_mutex;
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/* n_tty.c */
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void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
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#ifdef CONFIG_TTY
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void __init n_tty_init(void);
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#else
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static inline void n_tty_init(void) { }
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#endif
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/* tty_audit.c */
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#ifdef CONFIG_AUDIT
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void tty_audit_exit(void);
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void tty_audit_fork(struct signal_struct *sig);
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int tty_audit_push(void);
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#else
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static inline void tty_audit_exit(void)
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{
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}
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static inline void tty_audit_fork(struct signal_struct *sig)
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{
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}
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static inline int tty_audit_push(void)
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{
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return 0;
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}
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#endif
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/* tty_ioctl.c */
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int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd,
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unsigned long arg);
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/* vt.c */
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int vt_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
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long vt_compat_ioctl(struct tty_struct *tty, unsigned int cmd,
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unsigned long arg);
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/* tty_mutex.c */
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/* functions for preparation of BKL removal */
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void tty_lock(struct tty_struct *tty);
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int tty_lock_interruptible(struct tty_struct *tty);
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void tty_unlock(struct tty_struct *tty);
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void tty_lock_slave(struct tty_struct *tty);
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void tty_unlock_slave(struct tty_struct *tty);
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void tty_set_lock_subclass(struct tty_struct *tty);
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#endif
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