/* tty.h - Terminals */ #define TTY_IN_BYTES 256 /* tty input queue size */ #define TAB_SIZE 8 /* distance between tab stops */ #define TAB_MASK 7 /* mask to compute a tab stop position */ #define ESC '\33' /* escape */ #define O_NOCTTY 00400 /* from <fcntl.h>, or cc will choke */ #define O_NONBLOCK 04000 typedef _PROTOTYPE( void (*devfun_t), (struct tty *tp) ); typedef _PROTOTYPE( void (*devfunarg_t), (struct tty *tp, int c) ); typedef struct tty { int tty_events; /* set when TTY should inspect this line */ /* Input queue. Typed characters are stored here until read by a program. */ u16_t *tty_inhead; /* pointer to place where next char goes */ u16_t *tty_intail; /* pointer to next char to be given to prog */ int tty_incount; /* # chars in the input queue */ int tty_eotct; /* number of "line breaks" in input queue */ devfun_t tty_devread; /* routine to read from low level buffers */ devfun_t tty_icancel; /* cancel any device input */ int tty_min; /* minimum requested #chars in input queue */ clock_t tty_time; /* time when the input is available */ struct tty *tty_timenext; /* for a list of ttys with active timers */ /* Output section. */ devfun_t tty_devwrite; /* routine to start actual device output */ devfunarg_t tty_echo; /* routine to echo characters input */ devfun_t tty_ocancel; /* cancel any ongoing device output */ devfun_t tty_break; /* let the device send a break */ /* Terminal parameters and status. */ int tty_position; /* current position on the screen for echoing */ char tty_reprint; /* 1 when echoed input messed up, else 0 */ char tty_escaped; /* 1 when LNEXT (^V) just seen, else 0 */ char tty_inhibited; /* 1 when STOP (^S) just seen (stops output) */ char tty_pgrp; /* slot number of controlling process */ char tty_openct; /* count of number of opens of this tty */ /* Information about incomplete I/O requests is stored here. */ char tty_inrepcode; /* reply code, TASK_REPLY or REVIVE */ char tty_incaller; /* process that made the call (usually FS) */ char tty_inproc; /* process that wants to read from tty */ vir_bytes tty_in_vir; /* virtual address where data is to go */ int tty_inleft; /* how many chars are still needed */ int tty_incum; /* # chars input so far */ char tty_outrepcode; /* reply code, TASK_REPLY or REVIVE */ char tty_outcaller; /* process that made the call (usually FS) */ char tty_outproc; /* process that wants to write to tty */ vir_bytes tty_out_vir; /* virtual address where data comes from */ int tty_outleft; /* # chars yet to be output */ int tty_outcum; /* # chars output so far */ char tty_iocaller; /* process that made the call (usually FS) */ char tty_ioproc; /* process that wants to do an ioctl */ int tty_ioreq; /* ioctl request code */ vir_bytes tty_iovir; /* virtual address of ioctl buffer */ /* Miscellaneous. */ devfun_t tty_ioctl; /* set line speed, etc. at the device level */ devfun_t tty_close; /* tell the device that the tty is closed */ void *tty_priv; /* pointer to per device private data */ struct termios tty_termios; /* terminal attributes */ struct winsize tty_winsize; /* window size (#lines and #columns) */ u16_t tty_inbuf[TTY_IN_BYTES];/* tty input buffer */ } tty_t; EXTERN tty_t tty_table[NR_CONS+NR_RS_LINES+NR_PTYS]; /* Values for the fields. */ #define NOT_ESCAPED 0 /* previous character is not LNEXT (^V) */ #define ESCAPED 1 /* previous character was LNEXT (^V) */ #define RUNNING 0 /* no STOP (^S) has been typed to stop output */ #define STOPPED 1 /* STOP (^S) has been typed to stop output */ /* Fields and flags on characters in the input queue. */ #define IN_CHAR 0x00FF /* low 8 bits are the character itself */ #define IN_LEN 0x0F00 /* length of char if it has been echoed */ #define IN_LSHIFT 8 /* length = (c & IN_LEN) >> IN_LSHIFT */ #define IN_EOT 0x1000 /* char is a line break (^D, LF) */ #define IN_EOF 0x2000 /* char is EOF (^D), do not return to user */ #define IN_ESC 0x4000 /* escaped by LNEXT (^V), no interpretation */ /* Times and timeouts. */ #define TIME_NEVER ((clock_t) -1 < 0 ? (clock_t) LONG_MAX : (clock_t) -1) #define force_timeout() ((void) (tty_timeout = 0)) EXTERN tty_t *tty_timelist; /* list of ttys with active timers */ /* Number of elements and limit of a buffer. */ #define buflen(buf) (sizeof(buf) / sizeof((buf)[0])) #define bufend(buf) ((buf) + buflen(buf))