gdb/serial.h

   1 /* Remote serial support interface definitions for GDB, the GNU Debugger.
   2    Copyright 1992, 1993, 1999 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., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef SERIAL_H
  22 #define SERIAL_H
  23
  24 /* For most routines, if a failure is indicated, then errno should be
  25    examined.  */
  26
  27 /* Terminal state pointer.  This is specific to each type of
  28    interface. */
  29
  30 typedef void *serial_ttystate;
  31 struct _serial_t;
  32 typedef struct _serial_t *serial_t;
  33
  34 /* Try to open NAME.  Returns a new serial_t on success, NULL on
  35    failure. */
  36
  37 extern serial_t serial_open (const char *name);
  38 #define SERIAL_OPEN(NAME) serial_open(NAME)
  39
  40 /* Open a new serial stream using a file handle.  */
  41
  42 extern serial_t serial_fdopen (const int fd);
  43 #define SERIAL_FDOPEN(FD) serial_fdopen(FD)
  44
  45 /* Push out all buffers, close the device and destroy SERIAL_T. */
  46
  47 extern void serial_close (serial_t);
  48 #define SERIAL_CLOSE(SERIAL_T) serial_close ((SERIAL_T))
  49
  50 /* Push out all buffers and destroy SERIAL_T without closing the
  51    device.  */
  52
  53 extern void serial_un_fdopen (serial_t scb);
  54 #define SERIAL_UN_FDOPEN(SERIAL_T) serial_un_fdopen ((SERIAL_T))
  55
  56 /* Read one char from the serial device with TIMEOUT seconds to wait
  57    or -1 to wait forever.  Use timeout of 0 to effect a poll. Returns
  58    unsigned char if ok, else one of the following codes.  Note that
  59    all error return-codes are guaranteed to be < 0. */
  60
  61 enum serial_rc {
  62   SERIAL_ERROR = -1,    /* General error. */
  63   SERIAL_TIMEOUT = -2,  /* Timeout during read. ui_loop_hook() can,
  64                            unfortunatly, force this to be returned. */
  65   SERIAL_EOF = -3       /* General end-of-file or remote target
  66                            connection closed, indication.  Includes
  67                            things like the line dropping dead. */
  68 };
  69
  70 extern int serial_readchar (serial_t scb, int timeout);
  71 #define SERIAL_READCHAR(SERIAL_T, TIMEOUT) serial_readchar ((SERIAL_T), (TIMEOUT))
  72
  73 /* Write LEN chars from STRING to the port SERIAL_T.  Returns 0 for
  74    success, non-zero for failure.  */
  75
  76 extern int serial_write (serial_t scb, const char *str, int len);
  77 #define SERIAL_WRITE(SERIAL_T, STRING,LEN)  serial_write (SERIAL_T, STRING, LEN)
  78
  79 /* Write a printf style string onto the serial port. */
  80
  81 extern void serial_printf (serial_t desc, const char *,...) ATTR_FORMAT (printf, 2, 3);
  82
  83 /* Allow pending output to drain. */
  84
  85 extern int serial_drain_output (serial_t);
  86 #define SERIAL_DRAIN_OUTPUT(SERIAL_T) serial_drain_output ((SERIAL_T))
  87
  88 /* Flush (discard) pending output.  Might also flush input (if this
  89    system can't flush only output).  */
  90
  91 extern int serial_flush_output (serial_t);
  92 #define SERIAL_FLUSH_OUTPUT(SERIAL_T) serial_flush_output ((SERIAL_T))
  93
  94 /* Flush pending input.  Might also flush output (if this system can't
  95    flush only input).  */
  96
  97 extern int serial_flush_input (serial_t);
  98 #define SERIAL_FLUSH_INPUT(SERIAL_T) serial_flush_input ((SERIAL_T))
  99
 100 /* Send a break between 0.25 and 0.5 seconds long.  */
 101
 102 extern int serial_send_break (serial_t scb);
 103 #define SERIAL_SEND_BREAK(SERIAL_T) serial_send_break (SERIAL_T)
 104
 105 /* Turn the port into raw mode. */
 106
 107 extern void serial_raw (serial_t scb);
 108 #define SERIAL_RAW(SERIAL_T) serial_raw ((SERIAL_T))
 109
 110 /* Return a pointer to a newly malloc'd ttystate containing the state
 111    of the tty.  */
 112
 113 extern serial_ttystate serial_get_tty_state (serial_t scb);
 114 #define SERIAL_GET_TTY_STATE(SERIAL_T) serial_get_tty_state ((SERIAL_T))
 115
 116 /* Set the state of the tty to TTYSTATE.  The change is immediate.
 117    When changing to or from raw mode, input might be discarded.
 118    Returns 0 for success, negative value for error (in which case
 119    errno contains the error).  */
 120
 121 extern int serial_set_tty_state (serial_t scb, serial_ttystate ttystate);
 122 #define SERIAL_SET_TTY_STATE(SERIAL_T, TTYSTATE) serial_set_tty_state ((SERIAL_T), (TTYSTATE))
 123
 124 /* printf_filtered a user-comprehensible description of ttystate on
 125    the specified STREAM. FIXME: At present this sends output to the
 126    default stream - GDB_STDOUT. */
 127
 128 extern void serial_print_tty_state (serial_t scb, serial_ttystate ttystate, struct gdb_file *);
 129 #define SERIAL_PRINT_TTY_STATE(SERIAL_T, TTYSTATE, STREAM) serial_print_tty_state ((SERIAL_T), (TTYSTATE), (STREAM))
 130
 131 /* Set the tty state to NEW_TTYSTATE, where OLD_TTYSTATE is the
 132    current state (generally obtained from a recent call to
 133    SERIAL_GET_TTY_STATE), but be careful not to discard any input.
 134    This means that we never switch in or out of raw mode, even if
 135    NEW_TTYSTATE specifies a switch.  */
 136
 137 extern int serial_noflush_set_tty_state (serial_t scb, serial_ttystate new_ttystate, serial_ttystate old_ttystate);
 138 #define SERIAL_NOFLUSH_SET_TTY_STATE(SERIAL_T, NEW_TTYSTATE, OLD_TTYSTATE) \
 139 serial_noflush_set_tty_state ((SERIAL_T), (NEW_TTYSTATE), (OLD_TTYSTATE))
 140
 141 /* Set the baudrate to the decimal value supplied.  Returns 0 for
 142    success, -1 for failure.  */
 143
 144 extern int serial_setbaudrate (serial_t scb, int rate);
 145 #define SERIAL_SETBAUDRATE(SERIAL_T, RATE) serial_setbaudrate ((SERIAL_T), (RATE))
 146
 147 /* Set the number of stop bits to the value specified.  Returns 0 for
 148    success, -1 for failure.  */
 149
 150 #define SERIAL_1_STOPBITS 1
 151 #define SERIAL_1_AND_A_HALF_STOPBITS 2  /* 1.5 bits, snicker... */
 152 #define SERIAL_2_STOPBITS 3
 153
 154 extern int serial_setstopbits (serial_t scb, int num);
 155 #define SERIAL_SETSTOPBITS(SERIAL_T, NUM) serial_setstopbits ((SERIAL_T), (NUM))
 156
 157 /* Asynchronous serial interface: */
 158
 159 /* Can the serial device support asynchronous mode? */
 160
 161 extern int serial_can_async_p (serial_t scb);
 162 #define SERIAL_CAN_ASYNC_P(SERIAL_T) serial_can_async_p ((SERIAL_T))
 163
 164 /* Has the serial device been put in asynchronous mode? */
 165
 166 extern int serial_is_async_p (serial_t scb);
 167 #define SERIAL_IS_ASYNC_P(SERIAL_T) serial_is_async_p ((SERIAL_T))
 168
 169 /* For ASYNC enabled devices, register a callback and enable
 170    asynchronous mode.  To disable asynchronous mode, register a NULL
 171    callback. */
 172
 173 typedef void (serial_event_ftype) (serial_t scb, void *context);
 174 extern void serial_async (serial_t scb, serial_event_ftype *handler, void *context);
 175 #define SERIAL_ASYNC(SERIAL_T, HANDLER, CONTEXT) serial_async ((SERIAL_T), (HANDLER), (CONTEXT))
 176
 177 /* Provide direct access to the underlying FD (if any) used to
 178    implement the serial device.  This interface is clearly
 179    deprecated. Will call internal_error() if the operation isn't
 180    applicable to the current serial device. */
 181
 182 extern int deprecated_serial_fd (serial_t scb);
 183 #define DEPRECATED_SERIAL_FD(SERIAL_T) deprecated_serial_fd ((SERIAL_T))
 184
 185 /* Trace/debug mechanism.
 186
 187    SERIAL_DEBUG() enables/disables internal debugging.
 188    SERIAL_DEBUG_P() indicates the current debug state. */
 189
 190 extern void serial_debug (serial_t scb, int debug_p);
 191 #define SERIAL_DEBUG(SERIAL_T, DEBUG_P) serial_debug ((SERIAL_T), (DEBUG_P))
 192
 193 extern int serial_debug_p (serial_t scb);
 194 #define SERIAL_DEBUG_P(SERIAL_T) serial_debug_p ((SERIAL_T))
 195
 196
 197 /* Details of an instance of a serial object */
 198
 199 struct _serial_t
 200   {
 201     int fd;                     /* File descriptor */
 202     struct serial_ops *ops;     /* Function vector */
 203     void *state;                /* Local context info for open FD */
 204     serial_ttystate ttystate;   /* Not used (yet) */
 205     int bufcnt;                 /* Amount of data remaining in receive
 206                                    buffer.  -ve for sticky errors. */
 207     unsigned char *bufp;        /* Current byte */
 208     unsigned char buf[BUFSIZ];  /* Da buffer itself */
 209     int current_timeout;        /* (ser-unix.c termio{,s} only), last
 210                                    value of VTIME */
 211     int timeout_remaining;      /* (ser-unix.c termio{,s} only), we
 212                                    still need to wait for this many
 213                                    more seconds.  */
 214     char *name;                 /* The name of the device or host */
 215     struct _serial_t *next;     /* Pointer to the next serial_t */
 216     int refcnt;                 /* Number of pointers to this block */
 217     int debug_p;                /* Trace this serial devices operation. */
 218     int async_state;            /* Async internal state. */
 219     void *async_context;        /* Async event thread's context */
 220     serial_event_ftype *async_handler;/* Async event handler */
 221   };
 222
 223 struct serial_ops
 224   {
 225     char *name;
 226     struct serial_ops *next;
 227     int (*open) (serial_t, const char *name);
 228     void (*close) (serial_t);
 229     int (*readchar) (serial_t, int timeout);
 230     int (*write) (serial_t, const char *str, int len);
 231     /* Discard pending output */
 232     int (*flush_output) (serial_t);
 233     /* Discard pending input */
 234     int (*flush_input) (serial_t);
 235     int (*send_break) (serial_t);
 236     void (*go_raw) (serial_t);
 237     serial_ttystate (*get_tty_state) (serial_t);
 238     int (*set_tty_state) (serial_t, serial_ttystate);
 239     void (*print_tty_state) (serial_t, serial_ttystate, struct gdb_file *);
 240     int (*noflush_set_tty_state) (serial_t, serial_ttystate, serial_ttystate);
 241     int (*setbaudrate) (serial_t, int rate);
 242     int (*setstopbits) (serial_t, int num);
 243     /* Wait for output to drain */
 244     int (*drain_output) (serial_t);
 245     /* Change the serial device into/out of asynchronous mode, call
 246        the specified function when ever there is something
 247        interesting. */
 248     void (*async) (serial_t scb, int async_p);
 249   };
 250
 251 /* Add a new serial interface to the interface list */
 252
 253 extern void serial_add_interface (struct serial_ops * optable);
 254
 255 /* File in which to record the remote debugging session */
 256
 257 extern void serial_log_command (const char *);
 258
 259 #endif /* SERIAL_H */