Commit | Line | Data |
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c39c72ee PMF |
1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
2 | * | |
3 | * This library is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
d0b5f2b9 | 18 | #define _GNU_SOURCE |
f9e5ce61 PMF |
19 | #include <sys/types.h> |
20 | #include <signal.h> | |
21 | #include <errno.h> | |
22 | #include <sys/socket.h> | |
23 | #include <sys/un.h> | |
d0b5f2b9 | 24 | #include <unistd.h> |
aca1ad90 | 25 | #include <poll.h> |
f9e5ce61 PMF |
26 | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
d0b5f2b9 | 29 | #include <string.h> |
b0540e11 | 30 | #include <execinfo.h> |
d0b5f2b9 PMF |
31 | |
32 | #include "ustcomm.h" | |
33 | #include "localerr.h" | |
f9e5ce61 PMF |
34 | |
35 | #define UNIX_PATH_MAX 108 | |
f9e5ce61 | 36 | |
d0b5f2b9 PMF |
37 | #define MSG_MAX 1000 |
38 | ||
aca1ad90 PMF |
39 | /* FIXME: ustcomm blocks on message sending, which might be problematic in |
40 | * some cases. Fix the poll() usage so sends are buffered until they don't | |
41 | * block. | |
42 | */ | |
43 | ||
3847c3ba PMF |
44 | //static void bt(void) |
45 | //{ | |
46 | // void *buffer[100]; | |
47 | // int result; | |
48 | // | |
49 | // result = backtrace(&buffer, 100); | |
50 | // backtrace_symbols_fd(buffer, result, STDERR_FILENO); | |
51 | //} | |
b0540e11 | 52 | |
688760ef PMF |
53 | char *strdup_malloc(const char *s) |
54 | { | |
55 | char *retval; | |
56 | ||
57 | if(s == NULL) | |
58 | return NULL; | |
59 | ||
60 | retval = (char *) malloc(strlen(s)+1); | |
61 | ||
62 | strcpy(retval, s); | |
63 | ||
64 | return retval; | |
65 | } | |
66 | ||
52c51a47 | 67 | static int signal_process(pid_t pid) |
f9e5ce61 PMF |
68 | { |
69 | int result; | |
70 | ||
71 | result = kill(pid, UST_SIGNAL); | |
72 | if(result == -1) { | |
b0540e11 | 73 | PERROR("kill"); |
52c51a47 | 74 | return -1; |
f9e5ce61 PMF |
75 | } |
76 | ||
3bb56863 | 77 | /* FIXME: should wait in a better way */ |
52c51a47 PMF |
78 | //sleep(1); |
79 | ||
80 | return 0; | |
f9e5ce61 PMF |
81 | } |
82 | ||
ab33e65c PP |
83 | int pid_is_online(pid_t pid) { |
84 | return kill(pid, UST_SIGNAL) != -1; | |
85 | } | |
86 | ||
4e2a8808 | 87 | static int send_message_fd(int fd, const char *msg) |
811e4b93 PMF |
88 | { |
89 | int result; | |
90 | ||
91 | result = send(fd, msg, strlen(msg), 0); | |
92 | if(result == -1) { | |
93 | PERROR("send"); | |
94 | return -1; | |
95 | } | |
688760ef PMF |
96 | else if(result == 0) { |
97 | return 0; | |
98 | } | |
811e4b93 | 99 | |
688760ef | 100 | return 1; |
4e2a8808 PMF |
101 | |
102 | // *reply = (char *) malloc(MSG_MAX+1); | |
103 | // result = recv(fd, *reply, MSG_MAX, 0); | |
104 | // if(result == -1) { | |
105 | // PERROR("recv"); | |
106 | // return -1; | |
107 | // } | |
108 | // else if(result == 0) { | |
109 | // return 0; | |
110 | // } | |
111 | // | |
112 | // (*reply)[result] = '\0'; | |
113 | // | |
114 | // return 1; | |
811e4b93 PMF |
115 | } |
116 | ||
4e2a8808 | 117 | static int send_message_path(const char *path, const char *msg, int signalpid) |
f9e5ce61 PMF |
118 | { |
119 | int fd; | |
120 | int result; | |
121 | struct sockaddr_un addr; | |
f9e5ce61 | 122 | |
aca1ad90 | 123 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
f9e5ce61 | 124 | if(result == -1) { |
b0540e11 | 125 | PERROR("socket"); |
d0b5f2b9 | 126 | return -1; |
f9e5ce61 PMF |
127 | } |
128 | ||
129 | addr.sun_family = AF_UNIX; | |
130 | ||
b0540e11 | 131 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s", path); |
f9e5ce61 | 132 | if(result >= UNIX_PATH_MAX) { |
b0540e11 | 133 | ERR("string overflow allocating socket name"); |
d0b5f2b9 | 134 | return -1; |
f9e5ce61 PMF |
135 | } |
136 | ||
52c51a47 PMF |
137 | if(signalpid >= 0) { |
138 | result = signal_process(signalpid); | |
139 | if(result == -1) { | |
140 | ERR("could not signal process"); | |
141 | return -1; | |
142 | } | |
143 | } | |
f9e5ce61 | 144 | |
aca1ad90 | 145 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); |
f9e5ce61 | 146 | if(result == -1) { |
aca1ad90 PMF |
147 | PERROR("connect"); |
148 | return -1; | |
149 | } | |
150 | ||
4e2a8808 | 151 | return send_message_fd(fd, msg); |
f9e5ce61 PMF |
152 | } |
153 | ||
4e2a8808 PMF |
154 | ///* pid: the pid of the trace process that must receive the msg |
155 | // msg: pointer to a null-terminated message to send | |
156 | // reply: location where to put the null-terminated string of the reply; | |
157 | // it must be free'd after usage | |
158 | // */ | |
159 | // | |
160 | //int send_message_pid(pid_t pid, const char *msg, char **reply) | |
161 | //{ | |
162 | // int result; | |
163 | // char path[UNIX_PATH_MAX]; | |
164 | // | |
165 | // result = snprintf(path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid); | |
166 | // if(result >= UNIX_PATH_MAX) { | |
167 | // fprintf(stderr, "string overflow allocating socket name"); | |
168 | // return -1; | |
169 | // } | |
170 | // | |
171 | // send_message_path(path, msg, reply, pid); | |
172 | // | |
173 | // return 0; | |
174 | //} | |
b0540e11 PMF |
175 | |
176 | /* Called by an app to ask the consumer daemon to connect to it. */ | |
177 | ||
178 | int ustcomm_request_consumer(pid_t pid, const char *channel) | |
179 | { | |
180 | char path[UNIX_PATH_MAX]; | |
181 | int result; | |
182 | char *msg; | |
183 | ||
184 | result = snprintf(path, UNIX_PATH_MAX, "%s/ustd", SOCK_DIR); | |
185 | if(result >= UNIX_PATH_MAX) { | |
186 | fprintf(stderr, "string overflow allocating socket name"); | |
187 | return -1; | |
188 | } | |
189 | ||
190 | asprintf(&msg, "collect %d %s", pid, channel); | |
191 | ||
4e2a8808 | 192 | send_message_path(path, msg, -1); |
b0540e11 PMF |
193 | free(msg); |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
688760ef PMF |
198 | /* returns 1 to indicate a message was received |
199 | * returns 0 to indicate no message was received (cannot happen) | |
200 | * returns -1 to indicate an error | |
201 | */ | |
811e4b93 | 202 | |
b02e31e5 | 203 | static int recv_message_fd(int fd, char **msg, struct ustcomm_source *src) |
d0b5f2b9 | 204 | { |
d0b5f2b9 | 205 | int result; |
d0b5f2b9 PMF |
206 | |
207 | *msg = (char *) malloc(MSG_MAX+1); | |
b02e31e5 | 208 | |
aca1ad90 | 209 | result = recv(fd, *msg, MSG_MAX, 0); |
d0b5f2b9 | 210 | if(result == -1) { |
688760ef | 211 | PERROR("recv"); |
d0b5f2b9 PMF |
212 | return -1; |
213 | } | |
b0540e11 | 214 | |
d0b5f2b9 | 215 | (*msg)[result] = '\0'; |
b0540e11 PMF |
216 | |
217 | DBG("ustcomm_app_recv_message: result is %d, message is %s", result, (*msg)); | |
218 | ||
811e4b93 PMF |
219 | if(src) |
220 | src->fd = fd; | |
221 | ||
688760ef | 222 | return 1; |
d0b5f2b9 PMF |
223 | } |
224 | ||
811e4b93 PMF |
225 | int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src) |
226 | { | |
227 | int result; | |
228 | ||
4e2a8808 | 229 | result = send_message_fd(src->fd, msg); |
3a7b90de | 230 | if(result < 0) { |
811e4b93 PMF |
231 | ERR("error in send_message_fd"); |
232 | return -1; | |
233 | } | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
688760ef PMF |
238 | /* @timeout: max blocking time in milliseconds, -1 means infinity |
239 | * | |
240 | * returns 1 to indicate a message was received | |
241 | * returns 0 to indicate no message was received | |
242 | * returns -1 to indicate an error | |
243 | */ | |
244 | ||
245 | int ustcomm_recv_message(struct ustcomm_server *server, char **msg, struct ustcomm_source *src, int timeout) | |
b0540e11 | 246 | { |
aca1ad90 PMF |
247 | struct pollfd *fds; |
248 | struct ustcomm_connection *conn; | |
249 | int result; | |
250 | int retval; | |
251 | ||
252 | for(;;) { | |
253 | int idx = 0; | |
254 | int n_fds = 1; | |
255 | ||
811e4b93 | 256 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
257 | n_fds++; |
258 | } | |
259 | ||
260 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); | |
261 | if(fds == NULL) { | |
262 | ERR("malloc returned NULL"); | |
263 | return -1; | |
264 | } | |
265 | ||
266 | /* special idx 0 is for listening socket */ | |
811e4b93 | 267 | fds[idx].fd = server->listen_fd; |
aca1ad90 PMF |
268 | fds[idx].events = POLLIN; |
269 | idx++; | |
270 | ||
811e4b93 | 271 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
272 | fds[idx].fd = conn->fd; |
273 | fds[idx].events = POLLIN; | |
274 | idx++; | |
275 | } | |
276 | ||
69ba0156 PMF |
277 | while((result = poll(fds, n_fds, timeout)) == -1 && errno == EINTR) |
278 | /* nothing */; | |
aca1ad90 PMF |
279 | if(result == -1) { |
280 | PERROR("poll"); | |
281 | return -1; | |
282 | } | |
283 | ||
688760ef PMF |
284 | if(result == 0) |
285 | return 0; | |
286 | ||
aca1ad90 PMF |
287 | if(fds[0].revents) { |
288 | struct ustcomm_connection *newconn; | |
289 | int newfd; | |
290 | ||
811e4b93 | 291 | result = newfd = accept(server->listen_fd, NULL, NULL); |
aca1ad90 PMF |
292 | if(result == -1) { |
293 | PERROR("accept"); | |
294 | return -1; | |
295 | } | |
296 | ||
297 | newconn = (struct ustcomm_connection *) malloc(sizeof(struct ustcomm_connection)); | |
298 | if(newconn == NULL) { | |
299 | ERR("malloc returned NULL"); | |
300 | return -1; | |
301 | } | |
302 | ||
303 | newconn->fd = newfd; | |
304 | ||
811e4b93 | 305 | list_add(&newconn->list, &server->connections); |
aca1ad90 PMF |
306 | } |
307 | ||
308 | for(idx=1; idx<n_fds; idx++) { | |
309 | if(fds[idx].revents) { | |
310 | retval = recv_message_fd(fds[idx].fd, msg, src); | |
311 | if(**msg == 0) { | |
312 | /* connection finished */ | |
313 | close(fds[idx].fd); | |
314 | ||
811e4b93 | 315 | list_for_each_entry(conn, &server->connections, list) { |
aca1ad90 PMF |
316 | if(conn->fd == fds[idx].fd) { |
317 | list_del(&conn->list); | |
318 | break; | |
319 | } | |
320 | } | |
321 | } | |
322 | else { | |
323 | goto free_fds_return; | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | free(fds); | |
329 | } | |
330 | ||
331 | free_fds_return: | |
332 | free(fds); | |
333 | return retval; | |
b0540e11 PMF |
334 | } |
335 | ||
688760ef | 336 | int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout) |
811e4b93 | 337 | { |
688760ef | 338 | return ustcomm_recv_message(&ustd->server, msg, src, timeout); |
811e4b93 PMF |
339 | } |
340 | ||
688760ef | 341 | int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout) |
b0540e11 | 342 | { |
688760ef | 343 | return ustcomm_recv_message(&app->server, msg, src, timeout); |
b0540e11 PMF |
344 | } |
345 | ||
46ef48cd PMF |
346 | /* This removes src from the list of active connections of app. |
347 | */ | |
348 | ||
349 | int ustcomm_app_detach_client(struct ustcomm_app *app, struct ustcomm_source *src) | |
350 | { | |
351 | struct ustcomm_server *server = (struct ustcomm_server *)app; | |
352 | struct ustcomm_connection *conn; | |
353 | ||
354 | list_for_each_entry(conn, &server->connections, list) { | |
355 | if(conn->fd == src->fd) { | |
356 | list_del(&conn->list); | |
357 | goto found; | |
358 | } | |
359 | } | |
360 | ||
361 | return -1; | |
362 | found: | |
363 | return src->fd; | |
364 | } | |
365 | ||
d0b5f2b9 PMF |
366 | static int init_named_socket(char *name, char **path_out) |
367 | { | |
368 | int result; | |
369 | int fd; | |
370 | ||
371 | struct sockaddr_un addr; | |
372 | ||
aca1ad90 | 373 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
d0b5f2b9 PMF |
374 | if(result == -1) { |
375 | PERROR("socket"); | |
376 | return -1; | |
377 | } | |
378 | ||
379 | addr.sun_family = AF_UNIX; | |
380 | ||
381 | strncpy(addr.sun_path, name, UNIX_PATH_MAX); | |
382 | addr.sun_path[UNIX_PATH_MAX-1] = '\0'; | |
383 | ||
aca1ad90 PMF |
384 | result = access(name, F_OK); |
385 | if(result == 0) { | |
386 | /* file exists */ | |
387 | result = unlink(name); | |
388 | if(result == -1) { | |
389 | PERROR("unlink of socket file"); | |
390 | goto close_sock; | |
391 | } | |
392 | WARN("socket already exists; overwriting"); | |
393 | } | |
394 | ||
d0b5f2b9 PMF |
395 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
396 | if(result == -1) { | |
397 | PERROR("bind"); | |
398 | goto close_sock; | |
399 | } | |
400 | ||
aca1ad90 PMF |
401 | result = listen(fd, 1); |
402 | if(result == -1) { | |
403 | PERROR("listen"); | |
404 | goto close_sock; | |
405 | } | |
406 | ||
b0540e11 PMF |
407 | if(path_out) { |
408 | *path_out = ""; | |
d0b5f2b9 | 409 | *path_out = strdupa(addr.sun_path); |
b0540e11 | 410 | } |
d0b5f2b9 PMF |
411 | |
412 | return fd; | |
413 | ||
414 | close_sock: | |
415 | close(fd); | |
416 | ||
417 | return -1; | |
418 | } | |
419 | ||
4e2a8808 PMF |
420 | int ustcomm_send_request(struct ustcomm_connection *conn, char *req, char **reply) |
421 | { | |
422 | int result; | |
423 | ||
424 | result = send(conn->fd, req, strlen(req), 0); | |
425 | if(result == -1) { | |
426 | PERROR("send"); | |
427 | return -1; | |
428 | } | |
4e2a8808 PMF |
429 | |
430 | if(!reply) | |
431 | return 1; | |
432 | ||
433 | *reply = (char *) malloc(MSG_MAX+1); | |
434 | result = recv(conn->fd, *reply, MSG_MAX, 0); | |
435 | if(result == -1) { | |
436 | PERROR("recv"); | |
437 | return -1; | |
438 | } | |
439 | else if(result == 0) { | |
440 | return 0; | |
441 | } | |
442 | ||
443 | (*reply)[result] = '\0'; | |
444 | ||
445 | return 1; | |
446 | } | |
447 | ||
448 | int ustcomm_connect_path(char *path, struct ustcomm_connection *conn, pid_t signalpid) | |
449 | { | |
450 | int fd; | |
451 | int result; | |
452 | struct sockaddr_un addr; | |
453 | ||
454 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); | |
455 | if(result == -1) { | |
456 | PERROR("socket"); | |
457 | return -1; | |
458 | } | |
459 | ||
460 | addr.sun_family = AF_UNIX; | |
461 | ||
462 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
463 | if(result >= UNIX_PATH_MAX) { | |
464 | ERR("string overflow allocating socket name"); | |
465 | return -1; | |
466 | } | |
467 | ||
52c51a47 PMF |
468 | if(signalpid >= 0) { |
469 | result = signal_process(signalpid); | |
470 | if(result == -1) { | |
471 | ERR("could not signal process"); | |
472 | return -1; | |
473 | } | |
474 | } | |
4e2a8808 PMF |
475 | |
476 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
477 | if(result == -1) { | |
478 | PERROR("connect"); | |
479 | return -1; | |
480 | } | |
481 | ||
482 | conn->fd = fd; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | int ustcomm_disconnect(struct ustcomm_connection *conn) | |
488 | { | |
489 | return close(conn->fd); | |
490 | } | |
491 | ||
492 | int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn) | |
493 | { | |
494 | int result; | |
495 | char path[UNIX_PATH_MAX]; | |
496 | ||
497 | ||
498 | result = snprintf(path, UNIX_PATH_MAX, "%s/%d", SOCK_DIR, pid); | |
499 | if(result >= UNIX_PATH_MAX) { | |
500 | fprintf(stderr, "string overflow allocating socket name"); | |
501 | return -1; | |
502 | } | |
503 | ||
504 | return ustcomm_connect_path(path, conn, pid); | |
505 | } | |
506 | ||
507 | int ustcomm_disconnect_app(struct ustcomm_connection *conn) | |
508 | { | |
509 | close(conn->fd); | |
510 | return 0; | |
511 | } | |
512 | ||
d0b5f2b9 PMF |
513 | int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle) |
514 | { | |
515 | int result; | |
516 | char *name; | |
517 | ||
518 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)pid); | |
519 | if(result >= UNIX_PATH_MAX) { | |
520 | ERR("string overflow allocating socket name"); | |
521 | return -1; | |
522 | } | |
523 | ||
811e4b93 PMF |
524 | handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath)); |
525 | if(handle->server.listen_fd < 0) { | |
aca1ad90 | 526 | ERR("error initializing named socket"); |
d0b5f2b9 PMF |
527 | goto free_name; |
528 | } | |
529 | free(name); | |
530 | ||
811e4b93 | 531 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 532 | |
d0b5f2b9 PMF |
533 | return 0; |
534 | ||
535 | free_name: | |
536 | free(name); | |
537 | return -1; | |
538 | } | |
539 | ||
540 | int ustcomm_init_ustd(struct ustcomm_ustd *handle) | |
541 | { | |
3847c3ba PMF |
542 | int result; |
543 | char *name; | |
544 | ||
545 | result = asprintf(&name, "%s/%s", SOCK_DIR, "ustd"); | |
546 | if(result >= UNIX_PATH_MAX) { | |
547 | ERR("string overflow allocating socket name"); | |
548 | return -1; | |
549 | } | |
550 | ||
811e4b93 PMF |
551 | handle->server.listen_fd = init_named_socket(name, &handle->server.socketpath); |
552 | if(handle->server.listen_fd < 0) { | |
6cb88bc0 | 553 | ERR("error initializing named socket at %s", name); |
aca1ad90 PMF |
554 | goto free_name; |
555 | } | |
3847c3ba | 556 | free(name); |
d0b5f2b9 | 557 | |
811e4b93 | 558 | INIT_LIST_HEAD(&handle->server.connections); |
aca1ad90 | 559 | |
d0b5f2b9 | 560 | return 0; |
aca1ad90 PMF |
561 | |
562 | free_name: | |
563 | free(name); | |
564 | return -1; | |
d0b5f2b9 | 565 | } |
b02e31e5 | 566 | |
aca1ad90 | 567 | static char *find_tok(char *str) |
b02e31e5 PMF |
568 | { |
569 | while(*str == ' ') { | |
570 | str++; | |
571 | ||
572 | if(*str == 0) | |
573 | return NULL; | |
574 | } | |
575 | ||
576 | return str; | |
577 | } | |
578 | ||
579 | static char *find_sep(char *str) | |
580 | { | |
581 | while(*str != ' ') { | |
582 | str++; | |
583 | ||
584 | if(*str == 0) | |
585 | break; | |
586 | } | |
587 | ||
588 | return str; | |
589 | } | |
590 | ||
591 | int nth_token_is(char *str, char *token, int tok_no) | |
592 | { | |
593 | int i; | |
594 | char *start; | |
595 | char *end; | |
596 | ||
597 | for(i=0; i<=tok_no; i++) { | |
598 | str = find_tok(str); | |
599 | if(str == NULL) | |
600 | return -1; | |
601 | ||
602 | start = str; | |
603 | ||
604 | str = find_sep(str); | |
605 | if(str == NULL) | |
606 | return -1; | |
607 | ||
608 | end = str; | |
609 | } | |
610 | ||
611 | if(end-start != strlen(token)) | |
612 | return 0; | |
613 | ||
614 | if(strncmp(start, token, end-start)) | |
615 | return 0; | |
616 | ||
617 | return 1; | |
618 | } | |
619 | ||
620 | char *nth_token(char *str, int tok_no) | |
621 | { | |
622 | static char *retval = NULL; | |
623 | int i; | |
624 | char *start; | |
625 | char *end; | |
626 | ||
627 | for(i=0; i<=tok_no; i++) { | |
628 | str = find_tok(str); | |
629 | if(str == NULL) | |
630 | return NULL; | |
631 | ||
632 | start = str; | |
633 | ||
634 | str = find_sep(str); | |
635 | if(str == NULL) | |
636 | return NULL; | |
637 | ||
638 | end = str; | |
639 | } | |
640 | ||
641 | if(retval) { | |
642 | free(retval); | |
643 | retval = NULL; | |
644 | } | |
645 | ||
aca1ad90 | 646 | asprintf(&retval, "%.*s", (int)(end-start), start); |
b02e31e5 PMF |
647 | |
648 | return retval; | |
649 | } | |
650 |