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daf3f280 JM |
1 | /* Serial interface for a pipe to a separate program |
2 | Copyright 1999 Free Software Foundation, Inc. | |
3 | ||
4 | Contributed by Cygnus Solutions. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "serial.h" | |
25 | #include <sys/types.h> | |
96baa820 | 26 | #ifdef HAVE_SYS_WAIT_H |
daf3f280 | 27 | #include <sys/wait.h> |
96baa820 | 28 | #endif |
daf3f280 JM |
29 | #include <sys/socket.h> |
30 | #include <sys/time.h> | |
31 | #include <fcntl.h> | |
daf3f280 JM |
32 | |
33 | #include "signals.h" | |
34 | #include "gdb_string.h" | |
35 | ||
36 | extern int (*ui_loop_hook) PARAMS ((int)); | |
37 | ||
38 | static int pipe_open PARAMS ((serial_t scb, const char *name)); | |
39 | static void pipe_raw PARAMS ((serial_t scb)); | |
40 | static int wait_for PARAMS ((serial_t scb, int timeout)); | |
41 | static int pipe_readchar PARAMS ((serial_t scb, int timeout)); | |
42 | static int pipe_setbaudrate PARAMS ((serial_t scb, int rate)); | |
43 | static int pipe_setstopbits PARAMS ((serial_t scb, int num)); | |
44 | static int pipe_write PARAMS ((serial_t scb, const char *str, int len)); | |
45 | /* FIXME: static void pipe_restore PARAMS ((serial_t scb)); */ | |
46 | static void pipe_close PARAMS ((serial_t scb)); | |
47 | static serial_ttystate pipe_get_tty_state PARAMS ((serial_t scb)); | |
48 | static int pipe_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); | |
49 | static int pipe_return_0 PARAMS ((serial_t)); | |
50 | static int pipe_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate, | |
51 | serial_ttystate)); | |
52 | static void pipe_print_tty_state PARAMS ((serial_t, serial_ttystate)); | |
53 | ||
54 | extern void _initialize_ser_pipe PARAMS ((void)); | |
55 | ||
adf40b2e JM |
56 | #undef XMALLOC |
57 | #define XMALLOC(T) ((T*) xmalloc (sizeof (T))) | |
58 | ||
59 | ||
60 | struct pipe_state | |
61 | { | |
62 | int pid; | |
63 | }; | |
64 | ||
daf3f280 JM |
65 | /* Open up a raw pipe */ |
66 | ||
67 | static int | |
68 | pipe_open (scb, name) | |
69 | serial_t scb; | |
70 | const char *name; | |
71 | { | |
96baa820 | 72 | #if !defined(O_NONBLOCK) || !defined(F_GETFL) || !defined(F_SETFL) || !HAVE_SOCKETPAIR |
daf3f280 JM |
73 | return -1; |
74 | #else | |
adf40b2e | 75 | struct pipe_state *state; |
daf3f280 | 76 | /* This chunk: */ |
daf3f280 JM |
77 | /* Copyright (c) 1988, 1993 |
78 | * The Regents of the University of California. All rights reserved. | |
79 | * | |
80 | * This code is derived from software written by Ken Arnold and | |
81 | * published in UNIX Review, Vol. 6, No. 8. | |
82 | */ | |
83 | int pdes[2]; | |
84 | int pid; | |
85 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) | |
86 | return -1; | |
87 | ||
adf40b2e JM |
88 | pid = vfork (); |
89 | ||
90 | /* Error. */ | |
91 | if (pid == -1) | |
daf3f280 | 92 | { |
daf3f280 JM |
93 | close (pdes[0]); |
94 | close (pdes[1]); | |
95 | return -1; | |
adf40b2e JM |
96 | } |
97 | ||
98 | /* Child. */ | |
99 | if (pid == 0) | |
100 | { | |
101 | /* re-wire pdes[1] to stdin/stdout */ | |
daf3f280 JM |
102 | close (pdes[0]); |
103 | if (pdes[1] != STDOUT_FILENO) | |
104 | { | |
105 | dup2 (pdes[1], STDOUT_FILENO); | |
106 | close (pdes[1]); | |
107 | } | |
108 | dup2 (STDOUT_FILENO, STDIN_FILENO); | |
adf40b2e JM |
109 | #if 0 |
110 | /* close any stray FD's - FIXME - how? */ | |
111 | /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams | |
112 | from previous popen() calls that remain open in the | |
113 | parent process are closed in the new child process. */ | |
114 | for (old = pidlist; old; old = old->next) | |
115 | close (fileno (old->fp)); /* don't allow a flush */ | |
116 | #endif | |
daf3f280 JM |
117 | execl ("/bin/sh", "sh", "-c", name + 1, NULL); |
118 | _exit (127); | |
119 | } | |
120 | ||
adf40b2e | 121 | /* Parent. */ |
daf3f280 | 122 | close (pdes[1]); |
adf40b2e JM |
123 | /* :end chunk */ |
124 | state = XMALLOC (struct pipe_state); | |
125 | state->pid = pid; | |
daf3f280 | 126 | scb->fd = pdes[0]; |
adf40b2e | 127 | scb->state = state; |
daf3f280 JM |
128 | |
129 | /* Make it non-blocking */ | |
130 | { | |
131 | int flags = fcntl (scb->fd, F_GETFL, 0); | |
132 | if (fcntl (scb->fd, F_SETFL, flags | O_NONBLOCK) < 0) | |
133 | { | |
134 | perror ("ser-pipe"); | |
135 | pipe_close (scb); | |
136 | return -1; | |
137 | } | |
138 | } | |
139 | ||
140 | /* If we don't do this, GDB simply exits when the remote side dies. */ | |
141 | signal (SIGPIPE, SIG_IGN); | |
142 | return 0; | |
143 | #endif | |
144 | } | |
145 | ||
146 | static serial_ttystate | |
147 | pipe_get_tty_state (scb) | |
148 | serial_t scb; | |
149 | { | |
150 | /* return garbage */ | |
151 | return xmalloc (sizeof (int)); | |
152 | } | |
153 | ||
154 | static int | |
155 | pipe_set_tty_state (scb, ttystate) | |
156 | serial_t scb; | |
157 | serial_ttystate ttystate; | |
158 | { | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int | |
163 | pipe_return_0 (scb) | |
164 | serial_t scb; | |
165 | { | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static void | |
170 | pipe_raw (scb) | |
171 | serial_t scb; | |
172 | { | |
173 | return; /* Always in raw mode */ | |
174 | } | |
175 | ||
176 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, | |
177 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. | |
178 | ||
179 | For termio{s}, we actually just setup VTIME if necessary, and let the | |
180 | timeout occur in the read() in pipe_read(). | |
181 | */ | |
182 | ||
183 | static int | |
184 | wait_for (scb, timeout) | |
185 | serial_t scb; | |
186 | int timeout; | |
187 | { | |
188 | int numfds; | |
189 | struct timeval tv; | |
190 | fd_set readfds, exceptfds; | |
191 | ||
192 | FD_ZERO (&readfds); | |
193 | FD_ZERO (&exceptfds); | |
194 | ||
195 | tv.tv_sec = timeout; | |
196 | tv.tv_usec = 0; | |
197 | ||
198 | FD_SET (scb->fd, &readfds); | |
199 | FD_SET (scb->fd, &exceptfds); | |
200 | ||
201 | while (1) | |
202 | { | |
203 | if (timeout >= 0) | |
204 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv); | |
205 | else | |
206 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0); | |
207 | ||
208 | if (numfds <= 0) | |
209 | { | |
210 | if (numfds == 0) | |
211 | return SERIAL_TIMEOUT; | |
212 | else if (errno == EINTR) | |
213 | continue; | |
214 | else | |
215 | return SERIAL_ERROR; /* Got an error from select or poll */ | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | } | |
221 | ||
222 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds | |
223 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns | |
224 | char if successful. Returns -2 if timeout expired, EOF if line dropped | |
225 | dead, or -3 for any other error (see errno in that case). */ | |
226 | ||
227 | static int | |
228 | pipe_readchar (scb, timeout) | |
229 | serial_t scb; | |
230 | int timeout; | |
231 | { | |
232 | int status; | |
233 | int delta; | |
234 | ||
235 | if (scb->bufcnt-- > 0) | |
236 | return *scb->bufp++; | |
237 | ||
238 | /* We have to be able to keep the GUI alive here, so we break the original | |
239 | timeout into steps of 1 second, running the "keep the GUI alive" hook | |
240 | each time through the loop. | |
241 | ||
242 | Also, timeout = 0 means to poll, so we just set the delta to 0, so we | |
243 | will only go through the loop once. */ | |
244 | ||
245 | delta = (timeout == 0 ? 0 : 1); | |
246 | while (1) | |
247 | { | |
248 | ||
249 | /* N.B. The UI may destroy our world (for instance by calling | |
250 | remote_stop,) in which case we want to get out of here as | |
251 | quickly as possible. It is not safe to touch scb, since | |
252 | someone else might have freed it. The ui_loop_hook signals that | |
253 | we should exit by returning 1. */ | |
254 | ||
255 | if (ui_loop_hook) | |
256 | { | |
257 | if (ui_loop_hook (0)) | |
258 | return SERIAL_TIMEOUT; | |
259 | } | |
260 | ||
261 | status = wait_for (scb, delta); | |
262 | timeout -= delta; | |
263 | ||
264 | /* If we got a character or an error back from wait_for, then we can | |
265 | break from the loop before the timeout is completed. */ | |
266 | ||
267 | if (status != SERIAL_TIMEOUT) | |
268 | { | |
269 | break; | |
270 | } | |
271 | ||
272 | /* If we have exhausted the original timeout, then generate | |
273 | a SERIAL_TIMEOUT, and pass it out of the loop. */ | |
274 | ||
275 | else if (timeout == 0) | |
276 | { | |
d4f3574e | 277 | status = SERIAL_TIMEOUT; |
daf3f280 JM |
278 | break; |
279 | } | |
280 | } | |
281 | ||
282 | if (status < 0) | |
283 | return status; | |
284 | ||
285 | while (1) | |
286 | { | |
287 | scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ); | |
288 | if (scb->bufcnt != -1 || errno != EINTR) | |
289 | break; | |
290 | } | |
291 | ||
292 | if (scb->bufcnt <= 0) | |
293 | { | |
294 | if (scb->bufcnt == 0) | |
295 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to | |
296 | distinguish between EOF & timeouts | |
297 | someday] */ | |
298 | else | |
299 | return SERIAL_ERROR; /* Got an error from read */ | |
300 | } | |
301 | ||
302 | scb->bufcnt--; | |
303 | scb->bufp = scb->buf; | |
304 | return *scb->bufp++; | |
305 | } | |
306 | ||
307 | static int | |
308 | pipe_noflush_set_tty_state (scb, new_ttystate, old_ttystate) | |
309 | serial_t scb; | |
310 | serial_ttystate new_ttystate; | |
311 | serial_ttystate old_ttystate; | |
312 | { | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static void | |
317 | pipe_print_tty_state (scb, ttystate) | |
318 | serial_t scb; | |
319 | serial_ttystate ttystate; | |
320 | { | |
321 | /* Nothing to print. */ | |
322 | return; | |
323 | } | |
324 | ||
325 | static int | |
326 | pipe_setbaudrate (scb, rate) | |
327 | serial_t scb; | |
328 | int rate; | |
329 | { | |
330 | return 0; /* Never fails! */ | |
331 | } | |
332 | ||
333 | static int | |
334 | pipe_setstopbits (scb, num) | |
335 | serial_t scb; | |
336 | int num; | |
337 | { | |
338 | return 0; /* Never fails! */ | |
339 | } | |
340 | ||
341 | static int | |
342 | pipe_write (scb, str, len) | |
343 | serial_t scb; | |
344 | const char *str; | |
345 | int len; | |
346 | { | |
347 | int cc; | |
348 | ||
349 | while (len > 0) | |
350 | { | |
351 | cc = write (scb->fd, str, len); | |
352 | ||
353 | if (cc < 0) | |
354 | return 1; | |
355 | len -= cc; | |
356 | str += cc; | |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static void | |
362 | pipe_close (scb) | |
363 | serial_t scb; | |
364 | { | |
adf40b2e JM |
365 | struct pipe_state *state = scb->state; |
366 | if (state != NULL) | |
367 | { | |
368 | int pid = state->pid; | |
369 | close (scb->fd); | |
370 | scb->fd = -1; | |
371 | free (state); | |
372 | scb->state = NULL; | |
373 | kill (pid, SIGTERM); | |
374 | /* Might be useful to check that the child does die. */ | |
375 | } | |
daf3f280 JM |
376 | } |
377 | ||
378 | static struct serial_ops pipe_ops = | |
379 | { | |
380 | "pipe", | |
381 | 0, | |
382 | pipe_open, | |
383 | pipe_close, | |
384 | pipe_readchar, | |
385 | pipe_write, | |
386 | pipe_return_0, /* flush output */ | |
387 | pipe_return_0, /* flush input */ | |
388 | pipe_return_0, /* send break */ | |
389 | pipe_raw, | |
390 | pipe_get_tty_state, | |
391 | pipe_set_tty_state, | |
392 | pipe_print_tty_state, | |
393 | pipe_noflush_set_tty_state, | |
394 | pipe_setbaudrate, | |
395 | pipe_setstopbits, | |
396 | pipe_return_0, /* wait for output to drain */ | |
397 | }; | |
398 | ||
399 | void | |
400 | _initialize_ser_pipe () | |
401 | { | |
402 | serial_add_interface (&pipe_ops); | |
403 | } |