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, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
30 /* For most routines, if a failure is indicated, then errno should be
33 /* Terminal state pointer. This is specific to each type of
36 typedef void *serial_ttystate;
39 /* Try to open NAME. Returns a new `struct serial *' on success, NULL
40 on failure. Note that some open calls can block and, if possible,
41 should be written to be non-blocking, with calls to ui_look_hook
42 so they can be cancelled. An async interface for open could be
43 added to GDB if necessary. */
45 extern struct serial *serial_open (const char *name);
47 /* Find an already opened serial stream using a file handle. */
49 extern struct serial *serial_for_fd (int fd);
51 /* Open a new serial stream using a file handle. */
53 extern struct serial *serial_fdopen (const int fd);
55 /* Push out all buffers, close the device and destroy SCB. */
57 extern void serial_close (struct serial *scb);
59 /* Create a pipe, and put the read end in files[0], and the write end
60 in filde[1]. Returns 0 for success, negative value for error (in
61 which case errno contains the error). */
63 extern int gdb_pipe (int fildes[2]);
65 /* Create a pipe with each end wrapped in a `struct serial' interface.
66 Put the read end in scbs[0], and the write end in scbs[1]. Returns
67 0 for success, negative value for error (in which case errno
68 contains the error). */
70 extern int serial_pipe (struct serial *scbs[2]);
72 /* Push out all buffers and destroy SCB without closing the device. */
74 extern void serial_un_fdopen (struct serial *scb);
76 /* Read one char from the serial device with TIMEOUT seconds to wait
77 or -1 to wait forever. Use timeout of 0 to effect a poll.
78 Infinite waits are not permitted. Returns unsigned char if ok, else
79 one of the following codes. Note that all error return-codes are
80 guaranteed to be < 0. */
83 SERIAL_ERROR = -1, /* General error. */
84 SERIAL_TIMEOUT = -2, /* Timeout or data-not-ready during read.
85 Unfortunately, through
86 deprecated_ui_loop_hook (), this can also
87 be a QUIT indication. */
88 SERIAL_EOF = -3 /* General end-of-file or remote target
89 connection closed, indication. Includes
90 things like the line dropping dead. */
93 extern int serial_readchar (struct serial *scb, int timeout);
95 /* Write LEN chars from STRING to the port SCB. Returns 0 for
96 success, non-zero for failure. */
98 extern int serial_write (struct serial *scb, const char *str, int len);
100 /* Write a printf style string onto the serial port. */
102 extern void serial_printf (struct serial *desc,
103 const char *,...) ATTRIBUTE_PRINTF (2, 3);
105 /* Allow pending output to drain. */
107 extern int serial_drain_output (struct serial *);
109 /* Flush (discard) pending output. Might also flush input (if this
110 system can't flush only output). */
112 extern int serial_flush_output (struct serial *);
114 /* Flush pending input. Might also flush output (if this system can't
115 flush only input). */
117 extern int serial_flush_input (struct serial *);
119 /* Send a break between 0.25 and 0.5 seconds long. */
121 extern int serial_send_break (struct serial *scb);
123 /* Turn the port into raw mode. */
125 extern void serial_raw (struct serial *scb);
127 /* Return a pointer to a newly malloc'd ttystate containing the state
130 extern serial_ttystate serial_get_tty_state (struct serial *scb);
132 /* Return a pointer to a newly malloc'd ttystate containing a copy
133 of the state in TTYSTATE. */
135 extern serial_ttystate serial_copy_tty_state (struct serial *scb,
136 serial_ttystate ttystate);
138 /* Set the state of the tty to TTYSTATE. The change is immediate.
139 When changing to or from raw mode, input might be discarded.
140 Returns 0 for success, negative value for error (in which case
141 errno contains the error). */
143 extern int serial_set_tty_state (struct serial *scb, serial_ttystate ttystate);
145 /* printf_filtered a user-comprehensible description of ttystate on
146 the specified STREAM. FIXME: At present this sends output to the
147 default stream - GDB_STDOUT. */
149 extern void serial_print_tty_state (struct serial *scb,
150 serial_ttystate ttystate,
153 /* Set the tty state to NEW_TTYSTATE, where OLD_TTYSTATE is the
154 current state (generally obtained from a recent call to
155 serial_get_tty_state()), but be careful not to discard any input.
156 This means that we never switch in or out of raw mode, even if
157 NEW_TTYSTATE specifies a switch. */
159 extern int serial_noflush_set_tty_state (struct serial *scb,
160 serial_ttystate new_ttystate,
161 serial_ttystate old_ttystate);
163 /* Set the baudrate to the decimal value supplied. Returns 0 for
164 success, -1 for failure. */
166 extern int serial_setbaudrate (struct serial *scb, int rate);
168 /* Set the number of stop bits to the value specified. Returns 0 for
169 success, -1 for failure. */
171 #define SERIAL_1_STOPBITS 1
172 #define SERIAL_1_AND_A_HALF_STOPBITS 2 /* 1.5 bits, snicker... */
173 #define SERIAL_2_STOPBITS 3
175 extern int serial_setstopbits (struct serial *scb, int num);
177 /* Asynchronous serial interface: */
179 /* Can the serial device support asynchronous mode? */
181 extern int serial_can_async_p (struct serial *scb);
183 /* Has the serial device been put in asynchronous mode? */
185 extern int serial_is_async_p (struct serial *scb);
187 /* For ASYNC enabled devices, register a callback and enable
188 asynchronous mode. To disable asynchronous mode, register a NULL
191 typedef void (serial_event_ftype) (struct serial *scb, void *context);
192 extern void serial_async (struct serial *scb,
193 serial_event_ftype *handler, void *context);
195 /* Provide direct access to the underlying FD (if any) used to
196 implement the serial device. This interface is clearly
197 deprecated. Will call internal_error() if the operation isn't
198 applicable to the current serial device. */
200 extern int deprecated_serial_fd (struct serial *scb);
202 /* Trace/debug mechanism.
204 serial_debug() enables/disables internal debugging.
205 serial_debug_p() indicates the current debug state. */
207 extern void serial_debug (struct serial *scb, int debug_p);
209 extern int serial_debug_p (struct serial *scb);
212 /* Details of an instance of a serial object. */
216 int fd; /* File descriptor */
217 /* File descriptor for a separate error stream that should be
218 immediately forwarded to gdb_stderr. This may be -1.
219 If != -1, this descriptor should be non-blocking or
220 ops->avail should be non-NULL. */
222 struct serial_ops *ops; /* Function vector */
223 void *state; /* Local context info for open FD */
224 serial_ttystate ttystate; /* Not used (yet) */
225 int bufcnt; /* Amount of data remaining in receive
226 buffer. -ve for sticky errors. */
227 unsigned char *bufp; /* Current byte */
228 unsigned char buf[BUFSIZ]; /* Da buffer itself */
229 int current_timeout; /* (ser-unix.c termio{,s} only), last
231 int timeout_remaining; /* (ser-unix.c termio{,s} only), we
232 still need to wait for this many
234 char *name; /* The name of the device or host */
235 struct serial *next; /* Pointer to the next `struct serial *' */
236 int refcnt; /* Number of pointers to this block */
237 int debug_p; /* Trace this serial devices operation. */
238 int async_state; /* Async internal state. */
239 void *async_context; /* Async event thread's context */
240 serial_event_ftype *async_handler;/* Async event handler */
246 struct serial_ops *next;
247 int (*open) (struct serial *, const char *name);
248 void (*close) (struct serial *);
249 int (*fdopen) (struct serial *, int fd);
250 int (*readchar) (struct serial *, int timeout);
251 int (*write) (struct serial *, const char *str, int len);
252 /* Discard pending output */
253 int (*flush_output) (struct serial *);
254 /* Discard pending input */
255 int (*flush_input) (struct serial *);
256 int (*send_break) (struct serial *);
257 void (*go_raw) (struct serial *);
258 serial_ttystate (*get_tty_state) (struct serial *);
259 serial_ttystate (*copy_tty_state) (struct serial *, serial_ttystate);
260 int (*set_tty_state) (struct serial *, serial_ttystate);
261 void (*print_tty_state) (struct serial *, serial_ttystate,
263 int (*noflush_set_tty_state) (struct serial *, serial_ttystate,
265 int (*setbaudrate) (struct serial *, int rate);
266 int (*setstopbits) (struct serial *, int num);
267 /* Wait for output to drain. */
268 int (*drain_output) (struct serial *);
269 /* Change the serial device into/out of asynchronous mode, call
270 the specified function when ever there is something
272 void (*async) (struct serial *scb, int async_p);
273 /* Perform a low-level read operation, reading (at most) COUNT
274 bytes into SCB->BUF. Return zero at end of file. */
275 int (*read_prim)(struct serial *scb, size_t count);
276 /* Perform a low-level write operation, writing (at most) COUNT
278 int (*write_prim)(struct serial *scb, const void *buf, size_t count);
279 /* Return that number of bytes that can be read from FD
280 without blocking. Return value of -1 means that the
281 read will not block even if less that requested bytes
283 int (*avail)(struct serial *scb, int fd);
286 /* Return a handle to wait on, indicating available data from SCB
287 when signaled, in *READ. Return a handle indicating errors
289 void (*wait_handle) (struct serial *scb, HANDLE *read, HANDLE *except);
290 void (*done_wait_handle) (struct serial *scb);
291 #endif /* USE_WIN32API */
294 /* Add a new serial interface to the interface list. */
296 extern void serial_add_interface (struct serial_ops * optable);
298 /* File in which to record the remote debugging session. */
300 extern void serial_log_command (const char *);
304 /* Windows-only: find or create handles that we can wait on for this
306 extern void serial_wait_handle (struct serial *, HANDLE *, HANDLE *);
308 /* Windows-only: signal that we are done with the wait handles. */
309 extern void serial_done_wait_handle (struct serial *);
311 #endif /* USE_WIN32API */
313 #endif /* SERIAL_H */