128 lines
5.6 KiB
C
128 lines
5.6 KiB
C
/* tty.h - Terminals */
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#include <minix/chardriver.h>
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#include <minix/timers.h>
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/* First minor numbers for the various classes of TTY devices. */
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#define PTMX_MINOR 0 /* minor of the Unix98 clone device */
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#define TTYPX_MINOR 128
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#define PTYPX_MINOR 192
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#define UNIX98_MINOR 256 /* start of Unix98 pairs */
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#define TTY_IN_BYTES 256 /* tty input queue size */
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#define TTY_OUT_BYTES 2048 /* tty output queue size */
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#define TAB_SIZE 8 /* distance between tab stops */
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#define TAB_MASK 7 /* mask to compute a tab stop position */
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#define ESC '\33' /* escape */
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struct tty;
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typedef int (*devfun_t)(struct tty *tp, int try_only);
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typedef void (*devfunarg_t)(struct tty *tp, int c);
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typedef int (*devfunline_t)(struct tty *tp, devminor_t line);
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typedef struct tty {
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int tty_events; /* set when TTY should inspect this line */
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int tty_index; /* index into TTY table */
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/* Input queue. Typed characters are stored here until read by a program. */
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u16_t *tty_inhead; /* pointer to place where next char goes */
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u16_t *tty_intail; /* pointer to next char to be given to prog */
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int tty_incount; /* # chars in the input queue */
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int tty_eotct; /* number of "line breaks" in input queue */
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devfun_t tty_devread; /* routine to read from low level buffers */
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devfun_t tty_icancel; /* cancel any device input */
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int tty_min; /* minimum requested #chars in input queue */
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minix_timer_t tty_tmr; /* the timer for this tty */
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/* Output section. */
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devfun_t tty_devwrite; /* routine to start actual device output */
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devfunarg_t tty_echo; /* routine to echo characters input */
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devfun_t tty_ocancel; /* cancel any ongoing device output */
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devfun_t tty_break_on; /* let the device assert a break */
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devfun_t tty_break_off; /* let the device de-assert a break */
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/* Terminal parameters and status. */
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int tty_position; /* current position on the screen for echoing */
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char tty_reprint; /* 1 when echoed input messed up, else 0 */
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char tty_escaped; /* 1 when LNEXT (^V) just seen, else 0 */
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char tty_inhibited; /* 1 when STOP (^S) just seen (stops output) */
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endpoint_t tty_pgrp; /* endpoint of controlling process */
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char tty_openct; /* count of number of opens of this tty */
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/* Information about incomplete I/O requests is stored here. */
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endpoint_t tty_incaller; /* process that made the call, or NONE */
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cdev_id_t tty_inid; /* ID of suspended read request */
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cp_grant_id_t tty_ingrant; /* grant where data is to go */
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size_t tty_inleft; /* how many chars are still needed */
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size_t tty_incum; /* # chars input so far */
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endpoint_t tty_outcaller; /* process that made the call, or NONE */
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cdev_id_t tty_outid; /* ID of suspended write request */
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cp_grant_id_t tty_outgrant; /* grant where data comes from */
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size_t tty_outleft; /* # chars yet to be output */
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size_t tty_outcum; /* # chars output so far */
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endpoint_t tty_iocaller; /* process that made the call, or NONE */
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cdev_id_t tty_ioid; /* ID of suspended ioctl request */
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unsigned int tty_ioreq; /* ioctl request code */
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cp_grant_id_t tty_iogrant; /* virtual address of ioctl buffer or grant */
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/* select() data */
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unsigned int tty_select_ops; /* which operations are interesting */
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endpoint_t tty_select_proc; /* which process wants notification */
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devminor_t tty_select_minor; /* minor used to start select query */
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/* Miscellaneous. */
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devfunline_t tty_mayopen; /* check whether this tty may be opened */
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devfun_t tty_open; /* tell the device that the tty is opened */
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devfun_t tty_close; /* tell the device that the tty is closed */
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void *tty_priv; /* pointer to per device private data */
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struct termios tty_termios; /* terminal attributes */
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struct winsize tty_winsize; /* window size (#lines and #columns) */
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u16_t tty_inbuf[TTY_IN_BYTES];/* tty input buffer */
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} tty_t;
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/* Memory allocated in tty.c, so extern here. */
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extern tty_t tty_table[NR_PTYS];
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extern u32_t system_hz; /* system clock frequency */
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extern int tty_gid; /* group ID of the "tty" group */
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/* Values for the fields. */
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#define NOT_ESCAPED 0 /* previous character is not LNEXT (^V) */
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#define ESCAPED 1 /* previous character was LNEXT (^V) */
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#define RUNNING 0 /* no STOP (^S) has been typed to stop output */
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#define STOPPED 1 /* STOP (^S) has been typed to stop output */
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/* Fields and flags on characters in the input queue. */
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#define IN_CHAR 0x00FF /* low 8 bits are the character itself */
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#define IN_LEN 0x0F00 /* length of char if it has been echoed */
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#define IN_LSHIFT 8 /* length = (c & IN_LEN) >> IN_LSHIFT */
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#define IN_EOT 0x1000 /* char is a line break (^D, LF) */
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#define IN_EOF 0x2000 /* char is EOF (^D), do not return to user */
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#define IN_ESC 0x4000 /* escaped by LNEXT (^V), no interpretation */
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/* Number of elements and limit of a buffer. */
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#define buflen(buf) (sizeof(buf) / sizeof((buf)[0]))
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#define bufend(buf) ((buf) + buflen(buf))
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/* Function prototypes for TTY driver. */
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/* tty.c */
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void handle_events(struct tty *tp);
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void sigchar(struct tty *tp, int sig, int mayflush);
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void tty_task(void);
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tty_t *line2tty(devminor_t minor);
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int in_process(struct tty *tp, char *buf, int count);
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void out_process(struct tty *tp, char *bstart, char *bpos, char *bend,
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int *icount, int *ocount);
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void tty_wakeup(clock_t now);
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int select_try(struct tty *tp, int ops);
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int select_retry(struct tty *tp);
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int tty_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
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cp_grant_id_t grant, int flags, endpoint_t user_endpt, cdev_id_t id);
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/* pty.c */
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void do_pty(message *m_ptr, int ipc_status);
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void pty_init(struct tty *tp);
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void select_retry_pty(struct tty *tp);
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