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 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. Return zero at end of file. */ 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 */ 287