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   char *name;                   /* The name of the device or host */
  40   struct _serial_t *next;       /* Pointer to the next serial_t */
  41   int refcnt;                   /* Number of pointers to this block */
  42 };
  43
  44 typedef struct _serial_t *serial_t;
  45
  46 serial_t scb_base;              /* Pointer to list of scb's */
  47
  48 struct serial_ops {
  49   char *name;
  50   struct serial_ops *next;
  51   int (*open) PARAMS ((serial_t, const char *name));
  52   void (*close) PARAMS ((serial_t));
  53   int (*readchar) PARAMS ((serial_t, int timeout));
  54   int (*write) PARAMS ((serial_t, const char *str, int len));
  55   int (*flush_output) PARAMS ((serial_t));
  56   int (*flush_input) PARAMS ((serial_t));
  57   int (*send_break) PARAMS ((serial_t));
  58   void (*go_raw) PARAMS ((serial_t));
  59   serial_ttystate (*get_tty_state) PARAMS ((serial_t));
  60   int (*set_tty_state) PARAMS ((serial_t, serial_ttystate));
  61   void (*print_tty_state) PARAMS ((serial_t, serial_ttystate));
  62   int (*noflush_set_tty_state)
  63     PARAMS ((serial_t, serial_ttystate, serial_ttystate));
  64   int (*setbaudrate) PARAMS ((serial_t, int rate));
  65   int (*setstopbits) PARAMS ((serial_t, int num));
  66 };
  67
  68 /* Add a new serial interface to the interface list */
  69
  70 void serial_add_interface PARAMS ((struct serial_ops *optable));
  71
  72 serial_t serial_open PARAMS ((const char *name));
  73
  74 serial_t serial_fdopen PARAMS ((const int fd));
  75
  76 /* For most routines, if a failure is indicated, then errno should be
  77    examined.  */
  78
  79 /* Try to open NAME.  Returns a new serial_t on success, NULL on failure.
  80  */
  81
  82 #define SERIAL_OPEN(NAME) serial_open(NAME)
  83
  84 /* Open a new serial stream using a file handle.  */
  85
  86 #define SERIAL_FDOPEN(FD) serial_fdopen(FD)
  87
  88 /* Flush pending output.  Might also flush input (if this system can't flush
  89    only output).  */
  90
  91 #define SERIAL_FLUSH_OUTPUT(SERIAL_T) \
  92   ((SERIAL_T)->ops->flush_output((SERIAL_T)))
  93
  94 /* Flush pending input.  Might also flush output (if this system can't flush
  95    only input).  */
  96
  97 #define SERIAL_FLUSH_INPUT(SERIAL_T)\
  98   ((*(SERIAL_T)->ops->flush_input) ((SERIAL_T)))
  99
 100 /* Send a break between 0.25 and 0.5 seconds long.  */
 101
 102 #define SERIAL_SEND_BREAK(SERIAL_T) \
 103   ((*(SERIAL_T)->ops->send_break) (SERIAL_T))
 104
 105 /* Turn the port into raw mode. */
 106
 107 #define SERIAL_RAW(SERIAL_T) (SERIAL_T)->ops->go_raw((SERIAL_T))
 108
 109 /* Return a pointer to a newly malloc'd ttystate containing the state
 110    of the tty.  */
 111 #define SERIAL_GET_TTY_STATE(SERIAL_T) (SERIAL_T)->ops->get_tty_state((SERIAL_T))
 112
 113 /* Set the state of the tty to TTYSTATE.  The change is immediate.
 114    When changing to or from raw mode, input might be discarded.
 115    Returns 0 for success, negative value for error (in which case errno
 116    contains the error).  */
 117 #define SERIAL_SET_TTY_STATE(SERIAL_T, TTYSTATE) (SERIAL_T)->ops->set_tty_state((SERIAL_T), (TTYSTATE))
 118
 119 /* printf_filtered a user-comprehensible description of ttystate.  */
 120 #define SERIAL_PRINT_TTY_STATE(SERIAL_T, TTYSTATE) \
 121   ((*((SERIAL_T)->ops->print_tty_state)) ((SERIAL_T), (TTYSTATE)))
 122
 123 /* Set the tty state to NEW_TTYSTATE, where OLD_TTYSTATE is the
 124    current state (generally obtained from a recent call to
 125    SERIAL_GET_TTY_STATE), but be careful not to discard any input.
 126    This means that we never switch in or out of raw mode, even
 127    if NEW_TTYSTATE specifies a switch.  */
 128 #define SERIAL_NOFLUSH_SET_TTY_STATE(SERIAL_T, NEW_TTYSTATE, OLD_TTYSTATE) \
 129   ((*((SERIAL_T)->ops->noflush_set_tty_state)) \
 130     ((SERIAL_T), (NEW_TTYSTATE), (OLD_TTYSTATE)))
 131
 132 /* Read one char from the serial device with TIMEOUT seconds to wait
 133    or -1 to wait forever.  Use timeout of 0 to effect a poll. Returns
 134    char if ok, else one of the following codes.  Note that all error
 135    codes are guaranteed to be < 0.  */
 136
 137 #define SERIAL_ERROR -1         /* General error, see errno for details */
 138 #define SERIAL_TIMEOUT -2
 139 #define SERIAL_EOF -3
 140
 141 #define SERIAL_READCHAR(SERIAL_T, TIMEOUT) ((SERIAL_T)->ops->readchar((SERIAL_T), TIMEOUT))
 142
 143 /* Set the baudrate to the decimal value supplied.  Returns 0 for success,
 144    -1 for failure.  */
 145
 146 #define SERIAL_SETBAUDRATE(SERIAL_T, RATE) ((SERIAL_T)->ops->setbaudrate((SERIAL_T), RATE))
 147
 148 /* Set the number of stop bits to the value specified.  Returns 0 for success,
 149    -1 for failure.  */
 150
 151 #define SERIAL_1_STOPBITS 1
 152 #define SERIAL_1_AND_A_HALF_STOPBITS 2 /* 1.5 bits, snicker... */
 153 #define SERIAL_2_STOPBITS 3
 154
 155 #define SERIAL_SETSTOPBITS(SERIAL_T, NUM) ((SERIAL_T)->ops->setstopbits((SERIAL_T), NUM))
 156
 157 /* Write LEN chars from STRING to the port SERIAL_T.  Returns 0 for
 158    success, non-zero for failure.  */
 159
 160 #define SERIAL_WRITE(SERIAL_T, STRING, LEN) ((SERIAL_T)->ops->write((SERIAL_T), STRING, LEN))
 161
 162 /* Push out all buffers, close the device and destroy SERIAL_T. */
 163
 164 void serial_close PARAMS ((serial_t));
 165
 166 #define SERIAL_CLOSE(SERIAL_T) serial_close(SERIAL_T)
 167
 168 /* Destroy SERIAL_T without doing the rest of the stuff that SERIAL_CLOSE
 169    does.  */
 170
 171 #define SERIAL_UN_FDOPEN(SERIAL_T) (free (SERIAL_T))
 172
 173 #endif /* SERIAL_H */