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787 lines
28 KiB
787 lines
28 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_driver.h> |
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#include <linux/tty_ldisc.h> |
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#include <linux/mutex.h> |
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#include <linux/tty_flags.h> |
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#include <linux/seq_file.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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* Lock subclasses for tty locks |
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* |
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* TTY_LOCK_NORMAL is for normal ttys and master ptys. |
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* TTY_LOCK_SLAVE is for slave ptys only. |
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* |
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* Lock subclasses are necessary for handling nested locking with pty pairs. |
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* tty locks which use nested locking: |
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* |
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* legacy_mutex - Nested tty locks are necessary for releasing pty pairs. |
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* The stable lock order is master pty first, then slave pty. |
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* termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem. |
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* Subclassing this lock enables the slave pty to hold its |
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* termios_rwsem when claiming the master tty_buffer lock. |
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* tty_buffer lock - slave ptys can claim nested buffer lock when handling |
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* signal chars. The stable lock order is slave pty, then |
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* master. |
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*/ |
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enum { |
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TTY_LOCK_NORMAL = 0, |
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TTY_LOCK_SLAVE, |
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}; |
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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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struct tty_buffer { |
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union { |
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struct tty_buffer *next; |
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struct llist_node free; |
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}; |
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int used; |
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int size; |
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int commit; |
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int read; |
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int flags; |
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/* Data points here */ |
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unsigned long data[]; |
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}; |
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/* Values for .flags field of tty_buffer */ |
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#define TTYB_NORMAL 1 /* buffer has no flags buffer */ |
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static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs) |
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{ |
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return ((unsigned char *)b->data) + ofs; |
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} |
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static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs) |
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{ |
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return (char *)char_buf_ptr(b, ofs) + b->size; |
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} |
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struct tty_bufhead { |
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struct tty_buffer *head; /* Queue head */ |
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struct work_struct work; |
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struct mutex lock; |
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atomic_t priority; |
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struct tty_buffer sentinel; |
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struct llist_head free; /* Free queue head */ |
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atomic_t mem_used; /* In-use buffers excluding free list */ |
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int mem_limit; |
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struct tty_buffer *tail; /* Active buffer */ |
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}; |
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/* |
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* When a break, frame error, or parity error happens, these codes are |
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* stuffed into the flags buffer. |
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*/ |
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#define TTY_NORMAL 0 |
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#define TTY_BREAK 1 |
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#define TTY_FRAME 2 |
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#define TTY_PARITY 3 |
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#define TTY_OVERRUN 4 |
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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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/* |
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* Port level information. Each device keeps its own port level information |
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* so provide a common structure for those ports wanting to use common support |
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* routines. |
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* |
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* The tty port has a different lifetime to the tty so must be kept apart. |
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* In addition be careful as tty -> port mappings are valid for the life |
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* of the tty object but in many cases port -> tty mappings are valid only |
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* until a hangup so don't use the wrong path. |
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*/ |
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struct tty_port; |
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struct tty_port_operations { |
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/* Return 1 if the carrier is raised */ |
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int (*carrier_raised)(struct tty_port *port); |
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/* Control the DTR line */ |
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void (*dtr_rts)(struct tty_port *port, int raise); |
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/* Called when the last close completes or a hangup finishes |
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IFF the port was initialized. Do not use to free resources. Called |
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under the port mutex to serialize against activate/shutdowns */ |
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void (*shutdown)(struct tty_port *port); |
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/* Called under the port mutex from tty_port_open, serialized using |
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the port mutex */ |
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/* FIXME: long term getting the tty argument *out* of this would be |
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good for consoles */ |
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int (*activate)(struct tty_port *port, struct tty_struct *tty); |
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/* Called on the final put of a port */ |
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void (*destruct)(struct tty_port *port); |
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}; |
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struct tty_port_client_operations { |
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int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t); |
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void (*write_wakeup)(struct tty_port *port); |
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}; |
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extern const struct tty_port_client_operations tty_port_default_client_ops; |
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struct tty_port { |
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struct tty_bufhead buf; /* Locked internally */ |
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struct tty_struct *tty; /* Back pointer */ |
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struct tty_struct *itty; /* internal back ptr */ |
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const struct tty_port_operations *ops; /* Port operations */ |
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const struct tty_port_client_operations *client_ops; /* Port client operations */ |
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spinlock_t lock; /* Lock protecting tty field */ |
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int blocked_open; /* Waiting to open */ |
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int count; /* Usage count */ |
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wait_queue_head_t open_wait; /* Open waiters */ |
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wait_queue_head_t delta_msr_wait; /* Modem status change */ |
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unsigned long flags; /* User TTY flags ASYNC_ */ |
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unsigned long iflags; /* Internal flags TTY_PORT_ */ |
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unsigned char console:1; /* port is a console */ |
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struct mutex mutex; /* Locking */ |
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struct mutex buf_mutex; /* Buffer alloc lock */ |
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unsigned char *xmit_buf; /* Optional buffer */ |
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unsigned int close_delay; /* Close port delay */ |
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unsigned int closing_wait; /* Delay for output */ |
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int drain_delay; /* Set to zero if no pure time |
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based drain is needed else |
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set to size of fifo */ |
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struct kref kref; /* Ref counter */ |
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void *client_data; |
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}; |
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/* tty_port::iflags bits -- use atomic bit ops */ |
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#define TTY_PORT_INITIALIZED 0 /* device is initialized */ |
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#define TTY_PORT_SUSPENDED 1 /* device is suspended */ |
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#define TTY_PORT_ACTIVE 2 /* device is open */ |
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/* |
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* uart drivers: use the uart_port::status field and the UPSTAT_* defines |
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* for s/w-based flow control steering and carrier detection status |
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*/ |
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#define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */ |
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#define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */ |
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#define TTY_PORT_KOPENED 5 /* device exclusively opened by |
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kernel */ |
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/* |
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* Where all of the state associated with a tty is kept while the tty |
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* is open. Since the termios state should be kept even if the tty |
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* has been closed --- for things like the baud rate, etc --- it is |
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* not stored here, but rather a pointer to the real state is stored |
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* here. Possible the winsize structure should have the same |
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* treatment, but (1) the default 80x24 is usually right and (2) it's |
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* most often used by a windowing system, which will set the correct |
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* size each time the window is created or resized anyway. |
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* - TYT, 9/14/92 |
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*/ |
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struct tty_operations; |
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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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/* 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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spinlock_t ctrl_lock; |
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spinlock_t flow_lock; |
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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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struct pid *pgrp; /* Protected by ctrl lock */ |
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/* |
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* Writes protected by both ctrl lock and legacy mutex, readers must use |
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* at least one of them. |
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*/ |
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struct pid *session; |
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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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unsigned long stopped:1, /* flow_lock */ |
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flow_stopped:1, |
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unused:BITS_PER_LONG - 2; |
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int hw_stopped; |
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unsigned long ctrl_status:8, /* ctrl_lock */ |
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packet:1, |
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unused_ctrl:BITS_PER_LONG - 9; |
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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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/* Values for tty->flow_change */ |
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#define TTY_THROTTLE_SAFE 1 |
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#define TTY_UNTHROTTLE_SAFE 2 |
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static inline void __tty_set_flow_change(struct tty_struct *tty, int val) |
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{ |
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tty->flow_change = val; |
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} |
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static inline void tty_set_flow_change(struct tty_struct *tty, int val) |
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{ |
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tty->flow_change = val; |
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smp_mb(); |
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} |
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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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extern void tty_kref_put(struct tty_struct *tty); |
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extern struct pid *tty_get_pgrp(struct tty_struct *tty); |
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extern void tty_vhangup_self(void); |
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extern void disassociate_ctty(int priv); |
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extern dev_t tty_devnum(struct tty_struct *tty); |
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extern void proc_clear_tty(struct task_struct *p); |
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extern struct tty_struct *get_current_tty(void); |
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/* tty_io.c */ |
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extern int __init tty_init(void); |
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extern const char *tty_name(const struct tty_struct *tty); |
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extern struct tty_struct *tty_kopen_exclusive(dev_t device); |
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extern struct tty_struct *tty_kopen_shared(dev_t device); |
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extern void tty_kclose(struct tty_struct *tty); |
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extern int tty_dev_name_to_number(const char *name, dev_t *number); |
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extern int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout); |
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extern void tty_ldisc_unlock(struct tty_struct *tty); |
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extern ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *); |
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extern struct file *tty_release_redirect(struct tty_struct *tty); |
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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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|
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extern int vcs_init(void); |
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|
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extern struct class *tty_class; |
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|
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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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extern const char *tty_driver_name(const struct tty_struct *tty); |
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extern void tty_wait_until_sent(struct tty_struct *tty, long timeout); |
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extern int __tty_check_change(struct tty_struct *tty, int sig); |
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extern int tty_check_change(struct tty_struct *tty); |
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extern void __stop_tty(struct tty_struct *tty); |
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extern void stop_tty(struct tty_struct *tty); |
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extern void __start_tty(struct tty_struct *tty); |
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extern void start_tty(struct tty_struct *tty); |
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extern int tty_register_driver(struct tty_driver *driver); |
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extern int tty_unregister_driver(struct tty_driver *driver); |
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extern struct device *tty_register_device(struct tty_driver *driver, |
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unsigned index, struct device *dev); |
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extern struct device *tty_register_device_attr(struct tty_driver *driver, |
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unsigned index, struct device *device, |
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void *drvdata, |
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const struct attribute_group **attr_grp); |
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extern void tty_unregister_device(struct tty_driver *driver, unsigned index); |
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extern void tty_write_message(struct tty_struct *tty, char *msg); |
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extern int tty_send_xchar(struct tty_struct *tty, char ch); |
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extern int tty_put_char(struct tty_struct *tty, unsigned char c); |
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extern int tty_chars_in_buffer(struct tty_struct *tty); |
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extern int tty_write_room(struct tty_struct *tty); |
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extern void tty_driver_flush_buffer(struct tty_struct *tty); |
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extern void tty_throttle(struct tty_struct *tty); |
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extern void tty_unthrottle(struct tty_struct *tty); |
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extern int tty_throttle_safe(struct tty_struct *tty); |
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extern int tty_unthrottle_safe(struct tty_struct *tty); |
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extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws); |
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extern int tty_get_icount(struct tty_struct *tty, |
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struct serial_icounter_struct *icount); |
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extern int is_current_pgrp_orphaned(void); |
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extern void tty_hangup(struct tty_struct *tty); |
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extern void tty_vhangup(struct tty_struct *tty); |
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extern void tty_vhangup_session(struct tty_struct *tty); |
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extern int tty_hung_up_p(struct file *filp); |
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extern void do_SAK(struct tty_struct *tty); |
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extern void __do_SAK(struct tty_struct *tty); |
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extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty); |
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extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session); |
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extern void session_clear_tty(struct pid *session); |
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extern void no_tty(void); |
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extern void tty_buffer_free_all(struct tty_port *port); |
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extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld); |
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extern void tty_buffer_init(struct tty_port *port); |
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extern void tty_buffer_set_lock_subclass(struct tty_port *port); |
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extern bool tty_buffer_restart_work(struct tty_port *port); |
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extern bool tty_buffer_cancel_work(struct tty_port *port); |
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extern void tty_buffer_flush_work(struct tty_port *port); |
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extern speed_t tty_termios_baud_rate(struct ktermios *termios); |
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extern speed_t tty_termios_input_baud_rate(struct ktermios *termios); |
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extern void tty_termios_encode_baud_rate(struct ktermios *termios, |
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speed_t ibaud, speed_t obaud); |
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extern void tty_encode_baud_rate(struct tty_struct *tty, |
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speed_t ibaud, 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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extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old); |
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extern int tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b); |
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extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt); |
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extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *); |
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extern void tty_ldisc_deref(struct tty_ldisc *); |
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extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *); |
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extern void tty_ldisc_hangup(struct tty_struct *tty, bool reset); |
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extern int tty_ldisc_reinit(struct tty_struct *tty, int disc); |
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extern const struct seq_operations tty_ldiscs_seq_ops; |
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extern void tty_wakeup(struct tty_struct *tty); |
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extern void tty_ldisc_flush(struct tty_struct *tty); |
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extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
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extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
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unsigned int cmd, unsigned long arg); |
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extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty, |
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struct file *file, unsigned int cmd, unsigned long arg); |
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extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); |
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extern void tty_default_fops(struct file_operations *fops); |
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extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx); |
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extern int tty_alloc_file(struct file *file); |
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extern void tty_add_file(struct tty_struct *tty, struct file *file); |
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extern void tty_free_file(struct file *file); |
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extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx); |
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extern void tty_release_struct(struct tty_struct *tty, int idx); |
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extern int tty_release(struct inode *inode, struct file *filp); |
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extern void tty_init_termios(struct tty_struct *tty); |
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extern void tty_save_termios(struct tty_struct *tty); |
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extern 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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#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock)) |
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extern void tty_port_init(struct tty_port *port); |
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extern void tty_port_link_device(struct tty_port *port, |
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struct tty_driver *driver, unsigned index); |
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extern struct device *tty_port_register_device(struct tty_port *port, |
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struct tty_driver *driver, unsigned index, |
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struct device *device); |
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extern struct device *tty_port_register_device_attr(struct tty_port *port, |
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struct tty_driver *driver, unsigned index, |
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struct device *device, void *drvdata, |
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const struct attribute_group **attr_grp); |
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extern struct device *tty_port_register_device_serdev(struct tty_port *port, |
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struct tty_driver *driver, unsigned index, |
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struct device *device); |
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extern struct device *tty_port_register_device_attr_serdev(struct tty_port *port, |
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struct tty_driver *driver, unsigned index, |
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struct device *device, void *drvdata, |
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const struct attribute_group **attr_grp); |
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extern void tty_port_unregister_device(struct tty_port *port, |
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struct tty_driver *driver, unsigned index); |
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extern int tty_port_alloc_xmit_buf(struct tty_port *port); |
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extern void tty_port_free_xmit_buf(struct tty_port *port); |
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extern void tty_port_destroy(struct tty_port *port); |
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extern void tty_port_put(struct tty_port *port); |
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static inline struct tty_port *tty_port_get(struct tty_port *port) |
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{ |
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if (port && kref_get_unless_zero(&port->kref)) |
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return port; |
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return NULL; |
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} |
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/* If the cts flow control is enabled, return true. */ |
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static inline bool tty_port_cts_enabled(const struct tty_port *port) |
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{ |
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return test_bit(TTY_PORT_CTS_FLOW, &port->iflags); |
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} |
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static inline void tty_port_set_cts_flow(struct tty_port *port, bool val) |
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{ |
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assign_bit(TTY_PORT_CTS_FLOW, &port->iflags, val); |
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} |
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static inline bool tty_port_active(const struct tty_port *port) |
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{ |
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return test_bit(TTY_PORT_ACTIVE, &port->iflags); |
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} |
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static inline void tty_port_set_active(struct tty_port *port, bool val) |
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{ |
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assign_bit(TTY_PORT_ACTIVE, &port->iflags, val); |
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} |
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static inline bool tty_port_check_carrier(const struct tty_port *port) |
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{ |
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return test_bit(TTY_PORT_CHECK_CD, &port->iflags); |
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} |
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static inline void tty_port_set_check_carrier(struct tty_port *port, bool val) |
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{ |
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assign_bit(TTY_PORT_CHECK_CD, &port->iflags, val); |
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} |
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static inline bool tty_port_suspended(const struct tty_port *port) |
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{ |
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return test_bit(TTY_PORT_SUSPENDED, &port->iflags); |
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} |
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static inline void tty_port_set_suspended(struct tty_port *port, bool val) |
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{ |
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assign_bit(TTY_PORT_SUSPENDED, &port->iflags, val); |
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} |
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static inline bool tty_port_initialized(const struct tty_port *port) |
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{ |
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return test_bit(TTY_PORT_INITIALIZED, &port->iflags); |
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} |
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static inline void tty_port_set_initialized(struct tty_port *port, bool val) |
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{ |
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assign_bit(TTY_PORT_INITIALIZED, &port->iflags, val); |
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} |
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static inline bool tty_port_kopened(const struct tty_port *port) |
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{ |
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return test_bit(TTY_PORT_KOPENED, &port->iflags); |
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} |
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static inline void tty_port_set_kopened(struct tty_port *port, bool val) |
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{ |
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assign_bit(TTY_PORT_KOPENED, &port->iflags, val); |
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} |
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extern struct tty_struct *tty_port_tty_get(struct tty_port *port); |
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extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); |
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extern int tty_port_carrier_raised(struct tty_port *port); |
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extern void tty_port_raise_dtr_rts(struct tty_port *port); |
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extern void tty_port_lower_dtr_rts(struct tty_port *port); |
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extern void tty_port_hangup(struct tty_port *port); |
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extern void tty_port_tty_hangup(struct tty_port *port, bool check_clocal); |
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extern void tty_port_tty_wakeup(struct tty_port *port); |
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extern int tty_port_block_til_ready(struct tty_port *port, |
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struct tty_struct *tty, struct file *filp); |
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extern int tty_port_close_start(struct tty_port *port, |
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struct tty_struct *tty, struct file *filp); |
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extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); |
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extern void tty_port_close(struct tty_port *port, |
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struct tty_struct *tty, struct file *filp); |
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extern int tty_port_install(struct tty_port *port, struct tty_driver *driver, |
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struct tty_struct *tty); |
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extern int tty_port_open(struct tty_port *port, |
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struct tty_struct *tty, struct file *filp); |
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static inline int tty_port_users(struct tty_port *port) |
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{ |
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return port->count + port->blocked_open; |
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} |
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extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc); |
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extern int tty_unregister_ldisc(int disc); |
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extern int tty_set_ldisc(struct tty_struct *tty, int disc); |
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extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty); |
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extern void tty_ldisc_release(struct tty_struct *tty); |
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extern int __must_check tty_ldisc_init(struct tty_struct *tty); |
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extern void tty_ldisc_deinit(struct tty_struct *tty); |
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extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p, |
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char *f, int count); |
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extern void tty_sysctl_init(void); |
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/* n_tty.c */ |
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extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); |
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#ifdef CONFIG_TTY |
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extern 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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extern void tty_audit_add_data(struct tty_struct *tty, const void *data, |
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size_t size); |
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extern void tty_audit_exit(void); |
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extern void tty_audit_fork(struct signal_struct *sig); |
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extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); |
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extern int tty_audit_push(void); |
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#else |
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static inline void tty_audit_add_data(struct tty_struct *tty, const void *data, |
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size_t size) |
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{ |
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} |
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static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch) |
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{ |
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} |
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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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extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
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unsigned int cmd, unsigned long arg); |
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/* vt.c */ |
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extern int vt_ioctl(struct tty_struct *tty, |
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unsigned int cmd, unsigned long arg); |
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extern long vt_compat_ioctl(struct tty_struct *tty, |
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unsigned int cmd, unsigned long arg); |
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/* tty_mutex.c */ |
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/* functions for preparation of BKL removal */ |
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extern void tty_lock(struct tty_struct *tty); |
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extern int tty_lock_interruptible(struct tty_struct *tty); |
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extern void tty_unlock(struct tty_struct *tty); |
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extern void tty_lock_slave(struct tty_struct *tty); |
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extern void tty_unlock_slave(struct tty_struct *tty); |
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extern void tty_set_lock_subclass(struct tty_struct *tty); |
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#ifdef CONFIG_PROC_FS |
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extern void proc_tty_register_driver(struct tty_driver *); |
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extern void proc_tty_unregister_driver(struct tty_driver *); |
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#else |
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static inline void proc_tty_register_driver(struct tty_driver *d) {} |
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static inline void proc_tty_unregister_driver(struct tty_driver *d) {} |
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#endif |
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#define tty_msg(fn, tty, f, ...) \ |
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fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__) |
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#define tty_debug(tty, f, ...) tty_msg(pr_debug, tty, f, ##__VA_ARGS__) |
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#define tty_info(tty, f, ...) tty_msg(pr_info, tty, f, ##__VA_ARGS__) |
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#define tty_notice(tty, f, ...) tty_msg(pr_notice, tty, f, ##__VA_ARGS__) |
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#define tty_warn(tty, f, ...) tty_msg(pr_warn, tty, f, ##__VA_ARGS__) |
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#define tty_err(tty, f, ...) tty_msg(pr_err, tty, f, ##__VA_ARGS__) |
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#define tty_info_ratelimited(tty, f, ...) \ |
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tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__) |
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#endif
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