gdb/serial.h

   1 /* Remote serial support interface definitions for GDB, the GNU Debugger.
   2    Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2004,
   3    2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef SERIAL_H
  21 #define SERIAL_H
  22
  23 #ifdef USE_WIN32API
  24 #include <windows.h>
  25 #endif
  26
  27 struct ui_file;
  28
  29 /* For most routines, if a failure is indicated, then errno should be
  30    examined.  */
  31
  32 /* Terminal state pointer.  This is specific to each type of
  33    interface.  */
  34
  35 typedef void *serial_ttystate;
  36 struct serial;
  37
  38 /* Try to open NAME.  Returns a new `struct serial *' on success, NULL
  39    on failure. Note that some open calls can block and, if possible,
  40    should be  written to be non-blocking, with calls to ui_look_hook
  41    so they can be cancelled. An async interface for open could be
  42    added to GDB if necessary.  */
  43
  44 extern struct serial *serial_open (const char *name);
  45
  46 /* Find an already opened serial stream using a file handle.  */
  47
  48 extern struct serial *serial_for_fd (int fd);
  49
  50 /* Open a new serial stream using a file handle.  */
  51
  52 extern struct serial *serial_fdopen (const int fd);
  53
  54 /* Push out all buffers, close the device and destroy SCB.  */
  55
  56 extern void serial_close (struct serial *scb);
  57
  58 /* Push out all buffers and destroy SCB without closing the device.  */
  59
  60 extern void serial_un_fdopen (struct serial *scb);
  61
  62 /* Read one char from the serial device with TIMEOUT seconds to wait
  63    or -1 to wait forever.  Use timeout of 0 to effect a poll.
  64    Infinite waits are not permitted. Returns unsigned char if ok, else
  65    one of the following codes.  Note that all error return-codes are
  66    guaranteed to be < 0.  */
  67
  68 enum serial_rc {
  69   SERIAL_ERROR = -1,    /* General error.  */
  70   SERIAL_TIMEOUT = -2,  /* Timeout or data-not-ready during read.
  71                            Unfortunately, through
  72                            deprecated_ui_loop_hook (), this can also
  73                            be a QUIT indication.  */
  74   SERIAL_EOF = -3       /* General end-of-file or remote target
  75                            connection closed, indication.  Includes
  76                            things like the line dropping dead.  */
  77 };
  78
  79 extern int serial_readchar (struct serial *scb, int timeout);
  80
  81 /* Write LEN chars from STRING to the port SCB.  Returns 0 for
  82    success, non-zero for failure.  */
  83
  84 extern int serial_write (struct serial *scb, const char *str, int len);
  85
  86 /* Write a printf style string onto the serial port.  */
  87
  88 extern void serial_printf (struct serial *desc,
  89                            const char *,...) ATTR_FORMAT (printf, 2, 3);
  90
  91 /* Allow pending output to drain.  */
  92
  93 extern int serial_drain_output (struct serial *);
  94
  95 /* Flush (discard) pending output.  Might also flush input (if this
  96    system can't flush only output).  */
  97
  98 extern int serial_flush_output (struct serial *);
  99
 100 /* Flush pending input.  Might also flush output (if this system can't
 101    flush only input).  */
 102
 103 extern int serial_flush_input (struct serial *);
 104
 105 /* Send a break between 0.25 and 0.5 seconds long.  */
 106
 107 extern int serial_send_break (struct serial *scb);
 108
 109 /* Turn the port into raw mode.  */
 110
 111 extern void serial_raw (struct serial *scb);
 112
 113 /* Return a pointer to a newly malloc'd ttystate containing the state
 114    of the tty.  */
 115
 116 extern serial_ttystate serial_get_tty_state (struct serial *scb);
 117
 118 /* Set the state of the tty to TTYSTATE.  The change is immediate.
 119    When changing to or from raw mode, input might be discarded.
 120    Returns 0 for success, negative value for error (in which case
 121    errno contains the error).  */
 122
 123 extern int serial_set_tty_state (struct serial *scb, serial_ttystate ttystate);
 124
 125 /* printf_filtered a user-comprehensible description of ttystate on
 126    the specified STREAM. FIXME: At present this sends output to the
 127    default stream - GDB_STDOUT.  */
 128
 129 extern void serial_print_tty_state (struct serial *scb, serial_ttystate ttystate, struct ui_file *);
 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 (struct serial *scb, serial_ttystate new_ttystate, serial_ttystate old_ttystate);
 138
 139 /* Set the baudrate to the decimal value supplied.  Returns 0 for
 140    success, -1 for failure.  */
 141
 142 extern int serial_setbaudrate (struct serial *scb, int rate);
 143
 144 /* Set the number of stop bits to the value specified.  Returns 0 for
 145    success, -1 for failure.  */
 146
 147 #define SERIAL_1_STOPBITS 1
 148 #define SERIAL_1_AND_A_HALF_STOPBITS 2  /* 1.5 bits, snicker...  */
 149 #define SERIAL_2_STOPBITS 3
 150
 151 extern int serial_setstopbits (struct serial *scb, int num);
 152
 153 /* Asynchronous serial interface: */
 154
 155 /* Can the serial device support asynchronous mode? */
 156
 157 extern int serial_can_async_p (struct serial *scb);
 158
 159 /* Has the serial device been put in asynchronous mode? */
 160
 161 extern int serial_is_async_p (struct serial *scb);
 162
 163 /* For ASYNC enabled devices, register a callback and enable
 164    asynchronous mode.  To disable asynchronous mode, register a NULL
 165    callback.  */
 166
 167 typedef void (serial_event_ftype) (struct serial *scb, void *context);
 168 extern void serial_async (struct serial *scb, serial_event_ftype *handler, void *context);
 169
 170 /* Provide direct access to the underlying FD (if any) used to
 171    implement the serial device.  This interface is clearly
 172    deprecated. Will call internal_error() if the operation isn't
 173    applicable to the current serial device.  */
 174
 175 extern int deprecated_serial_fd (struct serial *scb);
 176
 177 /* Trace/debug mechanism.
 178
 179    serial_debug() enables/disables internal debugging.
 180    serial_debug_p() indicates the current debug state.  */
 181
 182 extern void serial_debug (struct serial *scb, int debug_p);
 183
 184 extern int serial_debug_p (struct serial *scb);
 185
 186
 187 /* Details of an instance of a serial object */
 188
 189 struct serial
 190   {
 191     int fd;                     /* File descriptor */
 192     /* File descriptor for a separate error stream that should be
 193        immediately forwarded to gdb_stderr.  This may be -1.
 194        If != -1, this descriptor should be non-blocking or
 195        ops->avail should be non-NULL.  */
 196     int error_fd;
 197     struct serial_ops *ops;     /* Function vector */
 198     void *state;                /* Local context info for open FD */
 199     serial_ttystate ttystate;   /* Not used (yet) */
 200     int bufcnt;                 /* Amount of data remaining in receive
 201                                    buffer.  -ve for sticky errors.  */
 202     unsigned char *bufp;        /* Current byte */
 203     unsigned char buf[BUFSIZ];  /* Da buffer itself */
 204     int current_timeout;        /* (ser-unix.c termio{,s} only), last
 205                                    value of VTIME */
 206     int timeout_remaining;      /* (ser-unix.c termio{,s} only), we
 207                                    still need to wait for this many
 208                                    more seconds.  */
 209     char *name;                 /* The name of the device or host */
 210     struct serial *next;        /* Pointer to the next `struct serial *' */
 211     int refcnt;                 /* Number of pointers to this block */
 212     int debug_p;                /* Trace this serial devices operation.  */
 213     int async_state;            /* Async internal state.  */
 214     void *async_context;        /* Async event thread's context */
 215     serial_event_ftype *async_handler;/* Async event handler */
 216   };
 217
 218 struct serial_ops
 219   {
 220     char *name;
 221     struct serial_ops *next;
 222     int (*open) (struct serial *, const char *name);
 223     void (*close) (struct serial *);
 224     int (*readchar) (struct serial *, int timeout);
 225     int (*write) (struct serial *, const char *str, int len);
 226     /* Discard pending output */
 227     int (*flush_output) (struct serial *);
 228     /* Discard pending input */
 229     int (*flush_input) (struct serial *);
 230     int (*send_break) (struct serial *);
 231     void (*go_raw) (struct serial *);
 232     serial_ttystate (*get_tty_state) (struct serial *);
 233     int (*set_tty_state) (struct serial *, serial_ttystate);
 234     void (*print_tty_state) (struct serial *, serial_ttystate,
 235                              struct ui_file *);
 236     int (*noflush_set_tty_state) (struct serial *, serial_ttystate,
 237                                   serial_ttystate);
 238     int (*setbaudrate) (struct serial *, int rate);
 239     int (*setstopbits) (struct serial *, int num);
 240     /* Wait for output to drain */
 241     int (*drain_output) (struct serial *);
 242     /* Change the serial device into/out of asynchronous mode, call
 243        the specified function when ever there is something
 244        interesting.  */
 245     void (*async) (struct serial *scb, int async_p);
 246     /* Perform a low-level read operation, reading (at most) COUNT
 247        bytes into SCB->BUF.  */
 248     int (*read_prim)(struct serial *scb, size_t count);
 249     /* Perform a low-level write operation, writing (at most) COUNT
 250        bytes from BUF.  */
 251     int (*write_prim)(struct serial *scb, const void *buf, size_t count);
 252     /* Return that number of bytes that can be read from FD
 253        without blocking.  Return value of -1 means that the
 254        the read will not block even if less that requested bytes
 255        are available.  */
 256     int (*avail)(struct serial *scb, int fd);
 257
 258 #ifdef USE_WIN32API
 259     /* Return a handle to wait on, indicating available data from SCB
 260        when signaled, in *READ.  Return a handle indicating errors
 261        in *EXCEPT.  */
 262     void (*wait_handle) (struct serial *scb, HANDLE *read, HANDLE *except);
 263     void (*done_wait_handle) (struct serial *scb);
 264 #endif /* USE_WIN32API */
 265   };
 266
 267 /* Add a new serial interface to the interface list */
 268
 269 extern void serial_add_interface (struct serial_ops * optable);
 270
 271 /* File in which to record the remote debugging session */
 272
 273 extern void serial_log_command (const char *);
 274
 275 #ifdef USE_WIN32API
 276
 277 /* Windows-only: find or create handles that we can wait on for this
 278    serial device.  */
 279 extern void serial_wait_handle (struct serial *, HANDLE *, HANDLE *);
 280
 281 /* Windows-only: signal that we are done with the wait handles.  */
 282 extern void serial_done_wait_handle (struct serial *);
 283
 284 #endif /* USE_WIN32API */
 285
 286 #endif /* SERIAL_H */