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524 lines
18 KiB
524 lines
18 KiB
/* 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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* @magic: magic value set early in @alloc_tty_struct to %TTY_MAGIC, for |
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* debugging purposes |
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* @kref: reference counting by tty_kref_get() and tty_kref_put(), reaching zero |
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* frees the structure |
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* @dev: class device or %NULL (e.g. ptys, serdev) |
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* @driver: &struct tty_driver operating this tty |
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* @ops: &struct tty_operations of @driver for this tty (open, close, etc.) |
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* @index: index of this tty (e.g. to construct @name like tty12) |
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* @ldisc_sem: protects line discipline changes (@ldisc) -- lock tty not pty |
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* @ldisc: the current line discipline for this tty (n_tty by default) |
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* @atomic_write_lock: protects against concurrent writers, i.e. locks |
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* @write_cnt, @write_buf and similar |
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* @legacy_mutex: leftover from history (BKL -> BTM -> @legacy_mutex), |
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* protecting several operations on this tty |
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* @throttle_mutex: protects against concurrent tty_throttle_safe() and |
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* tty_unthrottle_safe() (but not tty_unthrottle()) |
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* @termios_rwsem: protects @termios and @termios_locked |
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* @winsize_mutex: protects @winsize |
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* @termios: termios for the current tty, copied from/to @driver.termios |
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* @termios_locked: locked termios (by %TIOCGLCKTRMIOS and %TIOCSLCKTRMIOS |
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* ioctls) |
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* @name: name of the tty constructed by tty_line_name() (e.g. ttyS3) |
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* @flags: bitwise OR of %TTY_THROTTLED, %TTY_IO_ERROR, ... |
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* @count: count of open processes, reaching zero cancels all the work for |
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* this tty and drops a @kref too (but does not free this tty) |
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* @winsize: size of the terminal "window" (cf. @winsize_mutex) |
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* @flow: flow settings grouped together, see also @flow.unused |
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* @flow.lock: lock for @flow members |
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* @flow.stopped: tty stopped/started by stop_tty()/start_tty() |
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* @flow.tco_stopped: tty stopped/started by %TCOOFF/%TCOON ioctls (it has |
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* precedence 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: control settings grouped together, see also @ctrl.unused |
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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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* @ctrl.unused: alignment for Alpha, see @flow.unused for explanation |
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* @hw_stopped: not controlled by the tty layer, under @driver's control for CTS |
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* handling |
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* @receive_room: bytes permitted to feed to @ldisc without any being lost |
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* @flow_change: controls behavior of throttling, see tty_throttle_safe() and |
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* tty_unthrottle_safe() |
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* @link: link to another pty (master -> slave and vice versa) |
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* @fasync: state for %O_ASYNC (for %SIGIO); managed by fasync_helper() |
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* @write_wait: concurrent writers are waiting in this queue until they are |
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* allowed to write |
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* @read_wait: readers wait for data in this queue |
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* @hangup_work: normally a work to perform a hangup (do_tty_hangup()); while |
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* freeing the tty, (re)used to release_one_tty() |
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* @disc_data: pointer to @ldisc's private data (e.g. to &struct n_tty_data) |
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* @driver_data: pointer to @driver's private data (e.g. &struct uart_state) |
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* @files_lock: protects @tty_files list |
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* @tty_files: list of (re)openers of this tty (i.e. linked &struct |
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* tty_file_private) |
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* @closing: when set during close, n_tty processes only START & STOP chars |
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* @write_buf: temporary buffer used during tty_write() to copy user data to |
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* @write_cnt: count of bytes written in tty_write() to @write_buf |
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* @SAK_work: if the tty has a pending do_SAK, it is queued here |
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* @port: persistent storage for this device (i.e. &struct tty_port) |
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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 and is documented in |
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* &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; |
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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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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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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; |
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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; |
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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; |
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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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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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* DOC: TTY Struct Flags |
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* |
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* These bits are used in the :c:member:`tty_struct.flags` field. |
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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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* TTY_THROTTLED |
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* Driver input is throttled. The ldisc should call |
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* :c:member:`tty_driver.unthrottle()` in order to resume reception when |
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* it is ready to process more data (at threshold min). |
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* |
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* TTY_IO_ERROR |
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* If set, causes all subsequent userspace read/write calls on the tty to |
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* fail, returning -%EIO. (May be no ldisc too.) |
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* |
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* TTY_OTHER_CLOSED |
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* Device is a pty and the other side has closed. |
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* |
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* TTY_EXCLUSIVE |
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* Exclusive open mode (a single opener). |
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* |
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* TTY_DO_WRITE_WAKEUP |
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* If set, causes the driver to call the |
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* :c:member:`tty_ldisc_ops.write_wakeup()` method in order to resume |
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* transmission when it can accept more data to transmit. |
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* |
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* TTY_LDISC_OPEN |
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* Indicates that a line discipline is open. For debugging purposes only. |
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* |
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* TTY_PTY_LOCK |
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* A flag private to pty code to implement %TIOCSPTLCK/%TIOCGPTLCK logic. |
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* |
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* TTY_NO_WRITE_SPLIT |
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* Prevent driver from splitting up writes into smaller chunks (preserve |
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* write boundaries to driver). |
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* |
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* TTY_HUPPED |
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* The TTY was hung up. This is set post :c:member:`tty_driver.hangup()`. |
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* |
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* TTY_HUPPING |
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* The TTY is in the process of hanging up to abort potential readers. |
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* |
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* TTY_LDISC_CHANGING |
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* Line discipline for this TTY is being changed. I/O should not block |
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* when this is set. Use tty_io_nonblock() to check. |
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* |
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* TTY_LDISC_HALTED |
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* Line discipline for this TTY was stopped. No work should be queued to |
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* this ldisc. |
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*/ |
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#define TTY_THROTTLED 0 |
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#define TTY_IO_ERROR 1 |
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#define TTY_OTHER_CLOSED 2 |
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#define TTY_EXCLUSIVE 3 |
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#define TTY_DO_WRITE_WAKEUP 5 |
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#define TTY_LDISC_OPEN 11 |
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#define TTY_PTY_LOCK 16 |
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#define TTY_NO_WRITE_SPLIT 17 |
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#define TTY_HUPPED 18 |
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#define TTY_HUPPING 19 |
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#define TTY_LDISC_CHANGING 20 |
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#define TTY_LDISC_HALTED 22 |
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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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/** |
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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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|
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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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|
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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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|
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void tty_wakeup(struct tty_struct *tty); |
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|
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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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|
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extern struct mutex tty_mutex; |
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|
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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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|
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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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static inline void tty_audit_fork(struct signal_struct *sig) |
|
{ |
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} |
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static inline int tty_audit_push(void) |
|
{ |
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return 0; |
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} |
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#endif |
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|
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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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|
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/* vt.c */ |
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|
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int vt_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg); |
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|
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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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|
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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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|
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#endif
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