gdb/serial.h

   1 /* Remote serial support interface definitions for GDB, the GNU Debugger.
   2    Copyright 1992, 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifndef SERIAL_H
  21 #define SERIAL_H
  22
  23 /* Terminal state pointer.  This is specific to each type of interface. */
  24
  25 typedef PTR serial_ttystate;
  26
  27 struct _serial_t
  28 {
  29   int fd;                       /* File descriptor */
  30   struct serial_ops *ops;       /* Function vector */
  31   serial_ttystate ttystate;     /* Not used (yet) */
  32   int bufcnt;                   /* Amount of data in receive buffer */
  33   unsigned char *bufp;          /* Current byte */
  34   unsigned char buf[BUFSIZ];    /* Da buffer itself */
  35   int current_timeout;          /* (termio{s} only), last value of VTIME */
  36   /* ser-unix.c termio{,s} only, we still need to wait for this many more
  37      seconds.  */
  38   int timeout_remaining;
  39 };
  40
  41 typedef struct _serial_t *serial_t;
  42
  43 struct serial_ops {
  44   char *name;
  45   struct serial_ops *next;
  46   int (*open) PARAMS ((serial_t, const char *name));
  47   void (*close) PARAMS ((serial_t));
  48   int (*readchar) PARAMS ((serial_t, int timeout));
  49   int (*write) PARAMS ((serial_t, const char *str, int len));
  50   int (*flush_output) PARAMS ((serial_t));
  51   int (*flush_input) PARAMS ((serial_t));
  52   int (*send_break) PARAMS ((serial_t));
  53   void (*go_raw) PARAMS ((serial_t));
  54   serial_ttystate (*get_tty_state) PARAMS ((serial_t));
  55   int (*set_tty_state) PARAMS ((serial_t, serial_ttystate));
  56   void (*print_tty_state) PARAMS ((serial_t, serial_ttystate));
  57   int (*noflush_set_tty_state)
  58     PARAMS ((serial_t, serial_ttystate, serial_ttystate));
  59   int (*setbaudrate) PARAMS ((serial_t, int rate));
  60 };
  61
  62 /* Add a new serial interface to the interface list */
  63
  64 void serial_add_interface PARAMS ((struct serial_ops *optable));
  65
  66 serial_t serial_open PARAMS ((const char *name));
  67
  68 serial_t serial_fdopen PARAMS ((const int fd));
  69
  70 /* For most routines, if a failure is indicated, then errno should be
  71    examined.  */
  72
  73 /* Try to open NAME.  Returns a new serial_t on success, NULL on failure.
  74  */
  75
  76 #define SERIAL_OPEN(NAME) serial_open(NAME)
  77
  78 /* Open a new serial stream using a file handle.  */
  79
  80 #define SERIAL_FDOPEN(FD) serial_fdopen(FD)
  81
  82 /* Flush pending output.  Might also flush input (if this system can't flush
  83    only output).  */
  84
  85 #define SERIAL_FLUSH_OUTPUT(SERIAL_T) \
  86   ((SERIAL_T)->ops->flush_output((SERIAL_T)))
  87
  88 /* Flush pending input.  Might also flush output (if this system can't flush
  89    only input).  */
  90
  91 #define SERIAL_FLUSH_INPUT(SERIAL_T)\
  92   ((*(SERIAL_T)->ops->flush_input) ((SERIAL_T)))
  93
  94 /* Send a break between 0.25 and 0.5 seconds long.  */
  95
  96 #define SERIAL_SEND_BREAK(SERIAL_T) \
  97   ((*(SERIAL_T)->ops->send_break) (SERIAL_T))
  98
  99 /* Turn the port into raw mode. */
 100
 101 #define SERIAL_RAW(SERIAL_T) (SERIAL_T)->ops->go_raw((SERIAL_T))
 102
 103 /* Return a pointer to a newly malloc'd ttystate containing the state
 104    of the tty.  */
 105 #define SERIAL_GET_TTY_STATE(SERIAL_T) (SERIAL_T)->ops->get_tty_state((SERIAL_T))
 106
 107 /* Set the state of the tty to TTYSTATE.  The change is immediate.
 108    When changing to or from raw mode, input might be discarded.  */
 109 #define SERIAL_SET_TTY_STATE(SERIAL_T, TTYSTATE) (SERIAL_T)->ops->set_tty_state((SERIAL_T), (TTYSTATE))
 110
 111 /* printf_filtered a user-comprehensible description of ttystate.  */
 112 #define SERIAL_PRINT_TTY_STATE(SERIAL_T, TTYSTATE) \
 113   ((*((SERIAL_T)->ops->print_tty_state)) ((SERIAL_T), (TTYSTATE)))
 114
 115 /* Set the tty state to NEW_TTYSTATE, where OLD_TTYSTATE is the
 116    current state (generally obtained from a recent call to
 117    SERIAL_GET_TTY_STATE), but be careful not to discard any input.
 118    This means that we never switch in or out of raw mode, even
 119    if NEW_TTYSTATE specifies a switch.  */
 120 #define SERIAL_NOFLUSH_SET_TTY_STATE(SERIAL_T, NEW_TTYSTATE, OLD_TTYSTATE) \
 121   ((*((SERIAL_T)->ops->noflush_set_tty_state)) \
 122     ((SERIAL_T), (NEW_TTYSTATE), (OLD_TTYSTATE)))
 123
 124 /* Read one char from the serial device with TIMEOUT seconds to wait
 125    or -1 to wait forever.  Use timeout of 0 to effect a poll. Returns
 126    char if ok, else one of the following codes.  Note that all error
 127    codes are guaranteed to be < 0.  */
 128
 129 #define SERIAL_ERROR -1         /* General error, see errno for details */
 130 #define SERIAL_TIMEOUT -2
 131 #define SERIAL_EOF -3
 132
 133 #define SERIAL_READCHAR(SERIAL_T, TIMEOUT) ((SERIAL_T)->ops->readchar((SERIAL_T), TIMEOUT))
 134
 135 /* Set the baudrate to the decimal value supplied.  Returns 0 for success,
 136    -1 for failure.  */
 137
 138 #define SERIAL_SETBAUDRATE(SERIAL_T, RATE) ((SERIAL_T)->ops->setbaudrate((SERIAL_T), RATE))
 139
 140 /* Write LEN chars from STRING to the port SERIAL_T.  Returns 0 for
 141    success, non-zero for failure.  */
 142
 143 #define SERIAL_WRITE(SERIAL_T, STRING, LEN) ((SERIAL_T)->ops->write((SERIAL_T), STRING, LEN))
 144
 145 /* Push out all buffers, close the device and destroy SERIAL_T. */
 146
 147 void serial_close PARAMS ((serial_t));
 148
 149 #define SERIAL_CLOSE(SERIAL_T) serial_close(SERIAL_T)
 150
 151 /* Destroy SERIAL_T without doing the rest of the stuff that SERIAL_CLOSE
 152    does.  */
 153
 154 #define SERIAL_UN_FDOPEN(SERIAL_T) (free (SERIAL_T))
 155
 156 #endif /* SERIAL_H */