/* Copyright (C) 1995 Free Software Foundation, Inc. Written by Michael I. Bushnell, p/BSG. This file is part of the GNU Hurd. The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ #include #include #include #undef MDMBUF #undef ECHO #undef TOSTOP #undef FLUSHO #undef PENDIN #undef NOFLSH #include #define CHAR_SOH '\001' /* C-a */ #define CHAR_EOT '\004' /* C-d */ #define CHAR_DC1 '\021' /* C-q */ #define CHAR_DC2 '\022' /* C-r */ #define CHAR_DC3 '\023' /* C-s */ #define CHAR_USER_QUOTE '\377' /* break quoting, etc. */ /* XXX These belong in */ #define ILCASE (1 << 14) #define OLCASE (1 << 9) #define OTILDE (1 << 10) /* used in mdmctl device call */ #define MDMCTL_BIS 0 #define MDMCTL_BIC 1 #define MDMCTL_SET 2 /* Directly user-visible state */ struct termios termstate; /* Other state with the following bits: */ long termflags; #define USER_OUTPUT_SUSP 0x00000001 /* user has suspended output */ #define TTY_OPEN 0x00000002 /* someone has us open */ #define LAST_SLASH 0x00000004 /* last input char was \ */ #define LAST_LNEXT 0x00000008 /* last input char was VLNEXT */ #define INSIDE_HDERASE 0x00000010 /* inside \.../ hardcopy erase pair */ #define SENT_VSTOP 0x00000020 /* we've sent VSTOP to IXOFF peer */ #define FLUSH_OUTPUT 0x00000040 /* user wants output flushed */ #define NO_CARRIER 0x00000080 /* carrier is absent */ #define EXCL_USE 0x00000100 /* user accessible exclusive use */ #define NO_OWNER 0x00000200 /* there is no foreground_id */ #define ICKY_ASYNC 0x00000400 /* some user has set O_ASYNC */ /* Global lock */ struct mutex global_lock; /* Wakeup when NO_CARRIER turns off */ struct condition carrier_alert; /* Wakeup for select */ struct condition select_alert; /* Bucket for all our ports. */ struct port_bucket *term_bucket; /* Port class for tty control ports */ struct port_class *tty_cntl_class; /* Port class for tty I/O ports */ struct port_class *tty_class; /* Port class for ctty ID ports */ struct port_class *cttyid_class; /* Trivfs control structure for the tty */ struct trivfs_control *termctl; /* Filename for this terminal */ char *nodename; /* Mach device name for this terminal */ char *pterm_name; /* The queues we use */ struct queue *inputq, *rawq, *outputq; /* Functions a bottom half defines */ struct bottomhalf { void (*start_output) (void); void (*set_break) (void); void (*clear_break) (void); void (*abandon_physical_output) (void); void (*suspend_physical_output) (void); int (*pending_output_size) (void); void (*notice_input_flushed) (void); error_t (*assert_dtr) (void); void (*desert_dtr) (void); void (*set_bits) (void); void (*mdmctl) (int, int); int (*mdmstate) (void); }; struct bottomhalf *bottom; extern struct bottomhalf devio_bottom; /* Character queues */ #define QUEUE_QUOTE_MARK 0xf000 typedef short quoted_char; struct queue { int susp; int lowat; int hiwat; short *cs, *ce; int arraylen; struct condition *wait; quoted_char array[0]; }; struct queue *create_queue (int size, int lowat, int hiwat); /* Return the number of characters in Q. */ extern inline int qsize (struct queue *q) { return q->ce - q->cs; } /* Return nonzero if characters can be added to Q. */ extern inline int qavail (struct queue *q) { return !q->susp; } /* Flush all the characters from Q. */ extern inline int clear_queue (struct queue *q) { q->susp = 0; q->cs = q->ce = q->array; condition_broadcast (q->wait); } /* Return the next character off Q; leave the quoting bit on. */ extern inline quoted_char dequeue_quote (struct queue *q) { int beep = 0; assert (qsize (q)); if (q->susp && (qsize (q) < q->lowat)) { q->susp = 0; beep = 1; } if (qsize (q) == 1) beep = 1; if (beep) condition_broadcast (q->wait); return *q->cs++; } /* Return the next character off Q. */ extern inline char dequeue (struct queue *q) { return dequeue_quote (q) & ~QUEUE_QUOTE_MARK; } struct queue *reallocate_queue (struct queue *); /* Add C to *QP. */ extern inline void enqueue_internal (struct queue **qp, quoted_char c) { struct queue *q = *qp; if (q->ce - q->array == q->arraylen) q = *qp = reallocate_queue (q); *q->ce++ = c; if (qsize (q) == 1) condition_broadcast (q->wait); if (!q->susp && (qsize (q) > q->hiwat)) q->susp = 1; } /* Add C to *QP. */ extern inline void enqueue (struct queue **qp, char c) { enqueue_internal (qp, c); } /* Add C to *QP, marking it with a quote. */ extern inline void enqueue_quote (struct queue **qp, char c) { enqueue_internal (qp, c | QUEUE_QUOTE_MARK); } /* Return the unquoted version of a quoted_char. */ extern inline char unquote_char (quoted_char c) { return c & ~QUEUE_QUOTE_MARK; } /* Tell if a quoted_char is actually quoted. */ extern inline int char_quoted_p (quoted_char c) { return c & QUEUE_QUOTE_MARK; } /* Remove the most recently enqueue character from Q; leaving the quote mark on. */ extern inline short queue_erase (struct queue *q) { short answer; int beep = 0; assert (qsize (q)); answer = *--q->ce; if (q->susp && (qsize (q) < q->lowat)) { q->susp = 0; beep = 1; } if (qsize (q) == 0) beep = 1; if (beep) condition_broadcast (q->wait); return answer; } /* Functions devio is supposed to call */ int input_character (int); void report_carrier_on (void); void report_carrier_off (void); /* Other decls */ void drop_output (void); void send_signal (int); error_t drain_output (); void output_character (int); void copy_rawq (void); void rescan_inputq (void); void write_character (int); void init_users (void);