Commit | Line | Data |
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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> | |
26 | #include <sys/wait.h> | |
27 | #include <sys/socket.h> | |
28 | #include <sys/time.h> | |
29 | #include <fcntl.h> | |
30 | #ifdef HAVE_UNISTD_H | |
31 | #include <unistd.h> | |
32 | #endif | |
33 | ||
34 | #include "signals.h" | |
35 | #include "gdb_string.h" | |
36 | ||
37 | extern int (*ui_loop_hook) PARAMS ((int)); | |
38 | ||
39 | static int pipe_open PARAMS ((serial_t scb, const char *name)); | |
40 | static void pipe_raw PARAMS ((serial_t scb)); | |
41 | static int wait_for PARAMS ((serial_t scb, int timeout)); | |
42 | static int pipe_readchar PARAMS ((serial_t scb, int timeout)); | |
43 | static int pipe_setbaudrate PARAMS ((serial_t scb, int rate)); | |
44 | static int pipe_setstopbits PARAMS ((serial_t scb, int num)); | |
45 | static int pipe_write PARAMS ((serial_t scb, const char *str, int len)); | |
46 | /* FIXME: static void pipe_restore PARAMS ((serial_t scb)); */ | |
47 | static void pipe_close PARAMS ((serial_t scb)); | |
48 | static serial_ttystate pipe_get_tty_state PARAMS ((serial_t scb)); | |
49 | static int pipe_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); | |
50 | static int pipe_return_0 PARAMS ((serial_t)); | |
51 | static int pipe_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate, | |
52 | serial_ttystate)); | |
53 | static void pipe_print_tty_state PARAMS ((serial_t, serial_ttystate)); | |
54 | ||
55 | extern void _initialize_ser_pipe PARAMS ((void)); | |
56 | ||
adf40b2e JM |
57 | #undef XMALLOC |
58 | #define XMALLOC(T) ((T*) xmalloc (sizeof (T))) | |
59 | ||
60 | ||
61 | struct pipe_state | |
62 | { | |
63 | int pid; | |
64 | }; | |
65 | ||
daf3f280 JM |
66 | /* Open up a raw pipe */ |
67 | ||
68 | static int | |
69 | pipe_open (scb, name) | |
70 | serial_t scb; | |
71 | const char *name; | |
72 | { | |
73 | #if !defined(O_NONBLOCK) || !defined(F_GETFL) || !defined(F_SETFL) | |
74 | return -1; | |
75 | #else | |
adf40b2e | 76 | struct pipe_state *state; |
daf3f280 | 77 | /* This chunk: */ |
daf3f280 JM |
78 | /* Copyright (c) 1988, 1993 |
79 | * The Regents of the University of California. All rights reserved. | |
80 | * | |
81 | * This code is derived from software written by Ken Arnold and | |
82 | * published in UNIX Review, Vol. 6, No. 8. | |
83 | */ | |
84 | int pdes[2]; | |
85 | int pid; | |
86 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) | |
87 | return -1; | |
88 | ||
adf40b2e JM |
89 | pid = vfork (); |
90 | ||
91 | /* Error. */ | |
92 | if (pid == -1) | |
daf3f280 | 93 | { |
daf3f280 JM |
94 | close (pdes[0]); |
95 | close (pdes[1]); | |
96 | return -1; | |
adf40b2e JM |
97 | } |
98 | ||
99 | /* Child. */ | |
100 | if (pid == 0) | |
101 | { | |
102 | /* re-wire pdes[1] to stdin/stdout */ | |
daf3f280 JM |
103 | close (pdes[0]); |
104 | if (pdes[1] != STDOUT_FILENO) | |
105 | { | |
106 | dup2 (pdes[1], STDOUT_FILENO); | |
107 | close (pdes[1]); | |
108 | } | |
109 | dup2 (STDOUT_FILENO, STDIN_FILENO); | |
adf40b2e JM |
110 | #if 0 |
111 | /* close any stray FD's - FIXME - how? */ | |
112 | /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams | |
113 | from previous popen() calls that remain open in the | |
114 | parent process are closed in the new child process. */ | |
115 | for (old = pidlist; old; old = old->next) | |
116 | close (fileno (old->fp)); /* don't allow a flush */ | |
117 | #endif | |
daf3f280 JM |
118 | execl ("/bin/sh", "sh", "-c", name + 1, NULL); |
119 | _exit (127); | |
120 | } | |
121 | ||
adf40b2e | 122 | /* Parent. */ |
daf3f280 | 123 | close (pdes[1]); |
adf40b2e JM |
124 | /* :end chunk */ |
125 | state = XMALLOC (struct pipe_state); | |
126 | state->pid = pid; | |
daf3f280 | 127 | scb->fd = pdes[0]; |
adf40b2e | 128 | scb->state = state; |
daf3f280 JM |
129 | |
130 | /* Make it non-blocking */ | |
131 | { | |
132 | int flags = fcntl (scb->fd, F_GETFL, 0); | |
133 | if (fcntl (scb->fd, F_SETFL, flags | O_NONBLOCK) < 0) | |
134 | { | |
135 | perror ("ser-pipe"); | |
136 | pipe_close (scb); | |
137 | return -1; | |
138 | } | |
139 | } | |
140 | ||
141 | /* If we don't do this, GDB simply exits when the remote side dies. */ | |
142 | signal (SIGPIPE, SIG_IGN); | |
143 | return 0; | |
144 | #endif | |
145 | } | |
146 | ||
147 | static serial_ttystate | |
148 | pipe_get_tty_state (scb) | |
149 | serial_t scb; | |
150 | { | |
151 | /* return garbage */ | |
152 | return xmalloc (sizeof (int)); | |
153 | } | |
154 | ||
155 | static int | |
156 | pipe_set_tty_state (scb, ttystate) | |
157 | serial_t scb; | |
158 | serial_ttystate ttystate; | |
159 | { | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static int | |
164 | pipe_return_0 (scb) | |
165 | serial_t scb; | |
166 | { | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static void | |
171 | pipe_raw (scb) | |
172 | serial_t scb; | |
173 | { | |
174 | return; /* Always in raw mode */ | |
175 | } | |
176 | ||
177 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, | |
178 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. | |
179 | ||
180 | For termio{s}, we actually just setup VTIME if necessary, and let the | |
181 | timeout occur in the read() in pipe_read(). | |
182 | */ | |
183 | ||
184 | static int | |
185 | wait_for (scb, timeout) | |
186 | serial_t scb; | |
187 | int timeout; | |
188 | { | |
189 | int numfds; | |
190 | struct timeval tv; | |
191 | fd_set readfds, exceptfds; | |
192 | ||
193 | FD_ZERO (&readfds); | |
194 | FD_ZERO (&exceptfds); | |
195 | ||
196 | tv.tv_sec = timeout; | |
197 | tv.tv_usec = 0; | |
198 | ||
199 | FD_SET (scb->fd, &readfds); | |
200 | FD_SET (scb->fd, &exceptfds); | |
201 | ||
202 | while (1) | |
203 | { | |
204 | if (timeout >= 0) | |
205 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv); | |
206 | else | |
207 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0); | |
208 | ||
209 | if (numfds <= 0) | |
210 | { | |
211 | if (numfds == 0) | |
212 | return SERIAL_TIMEOUT; | |
213 | else if (errno == EINTR) | |
214 | continue; | |
215 | else | |
216 | return SERIAL_ERROR; /* Got an error from select or poll */ | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | } | |
222 | ||
223 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds | |
224 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns | |
225 | char if successful. Returns -2 if timeout expired, EOF if line dropped | |
226 | dead, or -3 for any other error (see errno in that case). */ | |
227 | ||
228 | static int | |
229 | pipe_readchar (scb, timeout) | |
230 | serial_t scb; | |
231 | int timeout; | |
232 | { | |
233 | int status; | |
234 | int delta; | |
235 | ||
236 | if (scb->bufcnt-- > 0) | |
237 | return *scb->bufp++; | |
238 | ||
239 | /* We have to be able to keep the GUI alive here, so we break the original | |
240 | timeout into steps of 1 second, running the "keep the GUI alive" hook | |
241 | each time through the loop. | |
242 | ||
243 | Also, timeout = 0 means to poll, so we just set the delta to 0, so we | |
244 | will only go through the loop once. */ | |
245 | ||
246 | delta = (timeout == 0 ? 0 : 1); | |
247 | while (1) | |
248 | { | |
249 | ||
250 | /* N.B. The UI may destroy our world (for instance by calling | |
251 | remote_stop,) in which case we want to get out of here as | |
252 | quickly as possible. It is not safe to touch scb, since | |
253 | someone else might have freed it. The ui_loop_hook signals that | |
254 | we should exit by returning 1. */ | |
255 | ||
256 | if (ui_loop_hook) | |
257 | { | |
258 | if (ui_loop_hook (0)) | |
259 | return SERIAL_TIMEOUT; | |
260 | } | |
261 | ||
262 | status = wait_for (scb, delta); | |
263 | timeout -= delta; | |
264 | ||
265 | /* If we got a character or an error back from wait_for, then we can | |
266 | break from the loop before the timeout is completed. */ | |
267 | ||
268 | if (status != SERIAL_TIMEOUT) | |
269 | { | |
270 | break; | |
271 | } | |
272 | ||
273 | /* If we have exhausted the original timeout, then generate | |
274 | a SERIAL_TIMEOUT, and pass it out of the loop. */ | |
275 | ||
276 | else if (timeout == 0) | |
277 | { | |
278 | status == SERIAL_TIMEOUT; | |
279 | break; | |
280 | } | |
281 | } | |
282 | ||
283 | if (status < 0) | |
284 | return status; | |
285 | ||
286 | while (1) | |
287 | { | |
288 | scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ); | |
289 | if (scb->bufcnt != -1 || errno != EINTR) | |
290 | break; | |
291 | } | |
292 | ||
293 | if (scb->bufcnt <= 0) | |
294 | { | |
295 | if (scb->bufcnt == 0) | |
296 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to | |
297 | distinguish between EOF & timeouts | |
298 | someday] */ | |
299 | else | |
300 | return SERIAL_ERROR; /* Got an error from read */ | |
301 | } | |
302 | ||
303 | scb->bufcnt--; | |
304 | scb->bufp = scb->buf; | |
305 | return *scb->bufp++; | |
306 | } | |
307 | ||
308 | static int | |
309 | pipe_noflush_set_tty_state (scb, new_ttystate, old_ttystate) | |
310 | serial_t scb; | |
311 | serial_ttystate new_ttystate; | |
312 | serial_ttystate old_ttystate; | |
313 | { | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static void | |
318 | pipe_print_tty_state (scb, ttystate) | |
319 | serial_t scb; | |
320 | serial_ttystate ttystate; | |
321 | { | |
322 | /* Nothing to print. */ | |
323 | return; | |
324 | } | |
325 | ||
326 | static int | |
327 | pipe_setbaudrate (scb, rate) | |
328 | serial_t scb; | |
329 | int rate; | |
330 | { | |
331 | return 0; /* Never fails! */ | |
332 | } | |
333 | ||
334 | static int | |
335 | pipe_setstopbits (scb, num) | |
336 | serial_t scb; | |
337 | int num; | |
338 | { | |
339 | return 0; /* Never fails! */ | |
340 | } | |
341 | ||
342 | static int | |
343 | pipe_write (scb, str, len) | |
344 | serial_t scb; | |
345 | const char *str; | |
346 | int len; | |
347 | { | |
348 | int cc; | |
349 | ||
350 | while (len > 0) | |
351 | { | |
352 | cc = write (scb->fd, str, len); | |
353 | ||
354 | if (cc < 0) | |
355 | return 1; | |
356 | len -= cc; | |
357 | str += cc; | |
358 | } | |
359 | return 0; | |
360 | } | |
361 | ||
362 | static void | |
363 | pipe_close (scb) | |
364 | serial_t scb; | |
365 | { | |
adf40b2e JM |
366 | struct pipe_state *state = scb->state; |
367 | if (state != NULL) | |
368 | { | |
369 | int pid = state->pid; | |
370 | close (scb->fd); | |
371 | scb->fd = -1; | |
372 | free (state); | |
373 | scb->state = NULL; | |
374 | kill (pid, SIGTERM); | |
375 | /* Might be useful to check that the child does die. */ | |
376 | } | |
daf3f280 JM |
377 | } |
378 | ||
379 | static struct serial_ops pipe_ops = | |
380 | { | |
381 | "pipe", | |
382 | 0, | |
383 | pipe_open, | |
384 | pipe_close, | |
385 | pipe_readchar, | |
386 | pipe_write, | |
387 | pipe_return_0, /* flush output */ | |
388 | pipe_return_0, /* flush input */ | |
389 | pipe_return_0, /* send break */ | |
390 | pipe_raw, | |
391 | pipe_get_tty_state, | |
392 | pipe_set_tty_state, | |
393 | pipe_print_tty_state, | |
394 | pipe_noflush_set_tty_state, | |
395 | pipe_setbaudrate, | |
396 | pipe_setstopbits, | |
397 | pipe_return_0, /* wait for output to drain */ | |
398 | }; | |
399 | ||
400 | void | |
401 | _initialize_ser_pipe () | |
402 | { | |
403 | serial_add_interface (&pipe_ops); | |
404 | } |