/* tty.h - Terminals */ #include #include /* First minor numbers for the various classes of TTY devices. */ #define PTMX_MINOR 0 /* minor of the Unix98 clone device */ #define TTYPX_MINOR 128 #define PTYPX_MINOR 192 #define UNIX98_MINOR 256 /* start of Unix98 pairs */ #define TTY_IN_BYTES 256 /* tty input queue size */ #define TTY_OUT_BYTES 2048 /* tty output 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 */ struct tty; typedef int (*devfun_t)(struct tty *tp, int try_only); typedef void (*devfunarg_t)(struct tty *tp, int c); typedef int (*devfunline_t)(struct tty *tp, devminor_t line); typedef struct tty { int tty_events; /* set when TTY should inspect this line */ int tty_index; /* index into TTY table */ /* 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 */ minix_timer_t tty_tmr; /* the timer for this tty */ /* 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_on; /* let the device assert a break */ devfun_t tty_break_off; /* let the device de-assert 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) */ endpoint_t tty_pgrp; /* endpoint of controlling process */ char tty_openct; /* count of number of opens of this tty */ /* Information about incomplete I/O requests is stored here. */ endpoint_t tty_incaller; /* process that made the call, or NONE */ cdev_id_t tty_inid; /* ID of suspended read request */ cp_grant_id_t tty_ingrant; /* grant where data is to go */ size_t tty_inleft; /* how many chars are still needed */ size_t tty_incum; /* # chars input so far */ endpoint_t tty_outcaller; /* process that made the call, or NONE */ cdev_id_t tty_outid; /* ID of suspended write request */ cp_grant_id_t tty_outgrant; /* grant where data comes from */ size_t tty_outleft; /* # chars yet to be output */ size_t tty_outcum; /* # chars output so far */ endpoint_t tty_iocaller; /* process that made the call, or NONE */ cdev_id_t tty_ioid; /* ID of suspended ioctl request */ unsigned int tty_ioreq; /* ioctl request code */ cp_grant_id_t tty_iogrant; /* virtual address of ioctl buffer or grant */ /* select() data */ unsigned int tty_select_ops; /* which operations are interesting */ endpoint_t tty_select_proc; /* which process wants notification */ devminor_t tty_select_minor; /* minor used to start select query */ /* Miscellaneous. */ devfunline_t tty_mayopen; /* check whether this tty may be opened */ devfun_t tty_open; /* tell the device that the tty is opened */ 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; /* Memory allocated in tty.c, so extern here. */ extern tty_t tty_table[NR_PTYS]; extern u32_t system_hz; /* system clock frequency */ extern int tty_gid; /* group ID of the "tty" group */ /* 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 */ /* Number of elements and limit of a buffer. */ #define buflen(buf) (sizeof(buf) / sizeof((buf)[0])) #define bufend(buf) ((buf) + buflen(buf)) /* Function prototypes for TTY driver. */ /* tty.c */ void handle_events(struct tty *tp); void sigchar(struct tty *tp, int sig, int mayflush); void tty_task(void); tty_t *line2tty(devminor_t minor); int in_process(struct tty *tp, char *buf, int count); void out_process(struct tty *tp, char *bstart, char *bpos, char *bend, int *icount, int *ocount); void tty_wakeup(clock_t now); int select_try(struct tty *tp, int ops); int select_retry(struct tty *tp); int tty_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt, cp_grant_id_t grant, int flags, endpoint_t user_endpt, cdev_id_t id); /* pty.c */ void do_pty(message *m_ptr, int ipc_status); void pty_init(struct tty *tp); void select_retry_pty(struct tty *tp);