Commit | Line | Data |
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68c1021b PMF |
1 | #include <stdio.h> |
2 | #include <stdint.h> | |
3 | #include <signal.h> | |
4 | #include <sys/types.h> | |
5 | #include <sys/socket.h> | |
6 | #include <sys/un.h> | |
98963de4 | 7 | #include <sched.h> |
a584bc4e | 8 | #include <fcntl.h> |
fbd8191b PMF |
9 | |
10 | #include "marker.h" | |
a584bc4e PMF |
11 | #include "tracer.h" |
12 | #include "usterr.h" | |
fbd8191b | 13 | |
68c1021b PMF |
14 | #define UNIX_PATH_MAX 108 |
15 | ||
16 | //#define SOCKETDIR "/var/run/ust/socks" | |
17 | #define SOCKETDIR "/tmp/socks" | |
18 | #define SOCKETDIRLEN sizeof(SOCKETDIR) | |
19 | #define USTSIGNAL SIGIO | |
20 | ||
21 | #define DBG(fmt, args...) fprintf(stderr, fmt "\n", ## args) | |
22 | #define WARN(fmt, args...) fprintf(stderr, "usertrace: WARNING: " fmt "\n", ## args) | |
a584bc4e | 23 | #define ERR(fmt, args...) fprintf(stderr, "usertrace: ERROR: " fmt "\n", ## args); fflush(stderr) |
68c1021b PMF |
24 | #define PERROR(call) perror("usertrace: ERROR: " call) |
25 | ||
98963de4 PMF |
26 | #define MAX_MSG_SIZE (100) |
27 | #define MSG_NOTIF 1 | |
28 | #define MSG_REGISTER_NOTIF 2 | |
29 | ||
a584bc4e PMF |
30 | char consumer_stack[10000]; |
31 | ||
68c1021b PMF |
32 | struct tracecmd { /* no padding */ |
33 | uint32_t size; | |
34 | uint16_t command; | |
35 | }; | |
36 | ||
98963de4 PMF |
37 | //struct listener_arg { |
38 | // int pipe_fd; | |
39 | //}; | |
40 | ||
41 | struct trctl_msg { | |
42 | /* size: the size of all the fields except size itself */ | |
43 | uint32_t size; | |
44 | uint16_t type; | |
45 | /* Only the necessary part of the payload is transferred. It | |
46 | * may even be none of it. | |
47 | */ | |
48 | char payload[94]; | |
49 | }; | |
68c1021b PMF |
50 | |
51 | pid_t mypid; | |
52 | char mysocketfile[UNIX_PATH_MAX] = ""; | |
98963de4 | 53 | int pfd = -1; |
68c1021b | 54 | |
a584bc4e PMF |
55 | struct consumer_channel { |
56 | int fd; | |
57 | struct ltt_channel_struct *chan; | |
58 | }; | |
59 | ||
60 | int consumer(void *arg) | |
61 | { | |
62 | int result; | |
63 | int fd; | |
64 | char str[] = "Hello, this is the consumer.\n"; | |
65 | struct ltt_trace_struct *trace; | |
66 | struct consumer_channel *consumer_channels; | |
67 | int i; | |
68 | char trace_name[] = "auto"; | |
69 | ||
70 | ltt_lock_traces(); | |
71 | trace = _ltt_trace_find(trace_name); | |
72 | ltt_unlock_traces(); | |
73 | ||
74 | if(trace == NULL) { | |
75 | CPRINTF("cannot find trace!"); | |
76 | return 1; | |
77 | } | |
78 | ||
79 | consumer_channels = (struct consumer_channel *) malloc(trace->nr_channels * sizeof(struct consumer_channel)); | |
80 | if(consumer_channels == NULL) { | |
81 | ERR("malloc returned NULL"); | |
82 | return 1; | |
83 | } | |
84 | ||
85 | CPRINTF("opening trace files"); | |
86 | for(i=0; i<trace->nr_channels; i++) { | |
87 | char tmp[100]; | |
88 | struct ltt_channel_struct *chan = &trace->channels[i]; | |
89 | ||
90 | consumer_channels[i].chan = chan; | |
91 | ||
92 | snprintf(tmp, sizeof(tmp), "trace/%s", chan->channel_name); | |
93 | result = consumer_channels[i].fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00644); | |
94 | if(result == -1) { | |
95 | perror("open"); | |
96 | return -1; | |
97 | } | |
98 | CPRINTF("\topened trace file %s", tmp); | |
99 | ||
100 | } | |
101 | CPRINTF("done opening trace files"); | |
102 | ||
103 | for(;;) { | |
104 | /*wait*/ | |
105 | ||
106 | for(i=0; i<trace->nr_channels; i++) { | |
107 | struct rchan *rchan = consumer_channels[i].chan->trans_channel_data; | |
108 | struct rchan_buf *rbuf = rchan->buf; | |
109 | struct ltt_channel_buf_struct *lttbuf = consumer_channels[i].chan->buf; | |
110 | long consumed_old; | |
111 | ||
112 | result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old); | |
113 | if(result < 0) { | |
114 | CPRINTF("ltt_do_get_subbuf: error: %s", strerror(-result)); | |
115 | } | |
116 | else { | |
117 | CPRINTF("success!"); | |
118 | ||
119 | result = write(consumer_channels[i].fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096); | |
120 | ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); | |
121 | } | |
122 | } | |
123 | ||
124 | sleep(1); | |
125 | } | |
126 | ||
127 | // CPRINTF("consumer: got a trace: %s with %d channels\n", trace_name, trace->nr_channels); | |
128 | // | |
129 | // struct ltt_channel_struct *chan = &trace->channels[0]; | |
130 | // | |
131 | // CPRINTF("channel 1 (%s) active=%u", chan->channel_name, chan->active & 1); | |
132 | ||
133 | // struct rchan *rchan = chan->trans_channel_data; | |
134 | // struct rchan_buf *rbuf = rchan->buf; | |
135 | // struct ltt_channel_buf_struct *lttbuf = chan->buf; | |
136 | // long consumed_old; | |
137 | // | |
138 | // result = fd = open("trace.out", O_WRONLY | O_CREAT | O_TRUNC, 00644); | |
139 | // if(result == -1) { | |
140 | // perror("open"); | |
141 | // return -1; | |
142 | // } | |
143 | ||
144 | // for(;;) { | |
145 | // write(STDOUT_FILENO, str, sizeof(str)); | |
146 | // | |
147 | // result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old); | |
148 | // if(result < 0) { | |
149 | // CPRINTF("ltt_do_get_subbuf: error: %s", strerror(-result)); | |
150 | // } | |
151 | // else { | |
152 | // CPRINTF("success!"); | |
153 | // | |
154 | // result = write(fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096); | |
155 | // ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); | |
156 | // } | |
157 | // | |
158 | // //CPRINTF("There seems to be %ld bytes available", SUBBUF_TRUNC(local_read(<tbuf->offset), rbuf->chan) - consumed_old); | |
159 | // CPRINTF("Commit count %ld", local_read(<tbuf->commit_count[0])); | |
160 | // | |
161 | // | |
162 | // sleep(1); | |
163 | // } | |
164 | } | |
165 | ||
166 | void start_consumer(void) | |
167 | { | |
168 | int result; | |
169 | ||
170 | result = clone(consumer, consumer_stack+sizeof(consumer_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); | |
171 | if(result == -1) { | |
172 | perror("clone"); | |
173 | } | |
174 | } | |
fbd8191b PMF |
175 | |
176 | static void print_markers(void) | |
177 | { | |
178 | struct marker_iter iter; | |
179 | ||
180 | marker_iter_reset(&iter); | |
181 | marker_iter_start(&iter); | |
182 | ||
183 | while(iter.marker) { | |
184 | fprintf(stderr, "marker: %s_%s \"%s\"\n", iter.marker->channel, iter.marker->name, iter.marker->format); | |
185 | marker_iter_next(&iter); | |
186 | } | |
187 | } | |
188 | ||
68c1021b PMF |
189 | void do_command(struct tracecmd *cmd) |
190 | { | |
191 | } | |
192 | ||
193 | void receive_commands() | |
194 | { | |
195 | } | |
196 | ||
98963de4 PMF |
197 | int fd_notif = -1; |
198 | void notif_cb(void) | |
199 | { | |
200 | int result; | |
201 | struct trctl_msg msg; | |
202 | ||
203 | /* FIXME: fd_notif should probably be protected by a spinlock */ | |
204 | ||
205 | if(fd_notif == -1) | |
206 | return; | |
207 | ||
208 | msg.type = MSG_NOTIF; | |
209 | msg.size = sizeof(msg.type); | |
210 | ||
211 | /* FIXME: don't block here */ | |
212 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); | |
213 | if(result == -1) { | |
214 | PERROR("write"); | |
215 | return; | |
216 | } | |
217 | } | |
218 | ||
fbd8191b PMF |
219 | char recvbuf[10000]; |
220 | ||
98963de4 PMF |
221 | int listener_main(void *p) |
222 | { | |
223 | int result; | |
224 | ||
98963de4 | 225 | for(;;) { |
98963de4 | 226 | uint32_t size; |
98963de4 PMF |
227 | struct sockaddr_un addr; |
228 | socklen_t addrlen = sizeof(addr); | |
aafb1650 PMF |
229 | char trace_name[] = "auto"; |
230 | char trace_type[] = "ustrelay"; | |
98963de4 | 231 | |
98963de4 PMF |
232 | for(;;) { |
233 | struct trctl_msg msg; | |
fbd8191b | 234 | int len; |
98963de4 | 235 | |
fbd8191b | 236 | result = len = recvfrom(pfd, recvbuf, sizeof(recvbuf), 0, &addr, &addrlen); |
98963de4 | 237 | if(result == -1) { |
fbd8191b | 238 | PERROR("recvfrom"); |
98963de4 PMF |
239 | continue; |
240 | } | |
241 | ||
aafb1650 PMF |
242 | if(recvbuf[len-1] == '\n') |
243 | recvbuf[len-1] = '\0'; | |
98963de4 | 244 | |
fbd8191b | 245 | fprintf(stderr, "received a message! it's: %s\n", recvbuf); |
98963de4 | 246 | |
fbd8191b PMF |
247 | |
248 | if(!strcmp(recvbuf, "print_markers")) { | |
249 | print_markers(); | |
250 | } | |
251 | else if(!strcmp(recvbuf, "trace_setup")) { | |
252 | DBG("trace setup"); | |
aafb1650 PMF |
253 | |
254 | result = ltt_trace_setup(trace_name); | |
255 | if(result < 0) { | |
256 | ERR("ltt_trace_setup failed"); | |
257 | return; | |
258 | } | |
259 | ||
260 | result = ltt_trace_set_type(trace_name, trace_type); | |
261 | if(result < 0) { | |
262 | ERR("ltt_trace_set_type failed"); | |
263 | return; | |
264 | } | |
fbd8191b PMF |
265 | } |
266 | else if(!strcmp(recvbuf, "trace_alloc")) { | |
267 | DBG("trace alloc"); | |
aafb1650 PMF |
268 | |
269 | result = ltt_trace_alloc(trace_name); | |
270 | if(result < 0) { | |
271 | ERR("ltt_trace_alloc failed"); | |
272 | return; | |
273 | } | |
fbd8191b PMF |
274 | } |
275 | else if(!strcmp(recvbuf, "trace_start")) { | |
276 | DBG("trace start"); | |
aafb1650 PMF |
277 | |
278 | result = ltt_trace_start(trace_name); | |
279 | if(result < 0) { | |
280 | ERR("ltt_trace_start failed"); | |
281 | return; | |
282 | } | |
fbd8191b PMF |
283 | } |
284 | else if(!strcmp(recvbuf, "trace_stop")) { | |
285 | DBG("trace stop"); | |
aafb1650 PMF |
286 | |
287 | result = ltt_trace_stop(trace_name); | |
288 | if(result < 0) { | |
289 | ERR("ltt_trace_stop failed"); | |
290 | return; | |
291 | } | |
292 | } | |
293 | else if(!strcmp(recvbuf, "trace_destroy")) { | |
294 | ||
295 | DBG("trace destroy"); | |
296 | ||
297 | result = ltt_trace_destroy(trace_name); | |
298 | if(result < 0) { | |
299 | ERR("ltt_trace_destroy failed"); | |
300 | return; | |
301 | } | |
fbd8191b | 302 | } |
98963de4 PMF |
303 | } |
304 | next_conn:; | |
305 | } | |
306 | } | |
307 | ||
308 | void create_listener(void) | |
309 | { | |
310 | int result; | |
311 | static char listener_stack[16384]; | |
312 | ||
fbd8191b | 313 | result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
98963de4 PMF |
314 | if(result == -1) { |
315 | perror("clone"); | |
316 | } | |
317 | } | |
318 | ||
68c1021b PMF |
319 | /* The signal handler itself. */ |
320 | ||
321 | void sighandler(int sig) | |
322 | { | |
323 | DBG("sighandler"); | |
fbd8191b | 324 | create_listener(); |
68c1021b PMF |
325 | } |
326 | ||
327 | /* Called by the app signal handler to chain it to us. */ | |
328 | ||
98963de4 | 329 | void chain_signal(void) |
68c1021b PMF |
330 | { |
331 | sighandler(USTSIGNAL); | |
332 | } | |
333 | ||
98963de4 | 334 | static int init_socket(void) |
68c1021b PMF |
335 | { |
336 | int result; | |
337 | int fd; | |
338 | char pidstr[6]; | |
339 | int pidlen; | |
340 | ||
341 | struct sockaddr_un addr; | |
342 | ||
fbd8191b | 343 | result = fd = socket(PF_UNIX, SOCK_DGRAM, 0); |
68c1021b PMF |
344 | if(result == -1) { |
345 | PERROR("socket"); | |
346 | return -1; | |
347 | } | |
348 | ||
349 | addr.sun_family = AF_UNIX; | |
350 | ||
351 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s/%d", SOCKETDIR, mypid); | |
352 | if(result >= UNIX_PATH_MAX) { | |
353 | ERR("string overflow allocating socket name"); | |
354 | goto close_sock; | |
355 | } | |
356 | //DBG("opening socket at %s", addr.sun_path); | |
357 | ||
358 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
359 | if(result == -1) { | |
360 | PERROR("bind"); | |
361 | goto close_sock; | |
362 | } | |
363 | ||
364 | strcpy(mysocketfile, addr.sun_path); | |
365 | ||
98963de4 PMF |
366 | pfd = fd; |
367 | return 0; | |
368 | ||
68c1021b PMF |
369 | close_sock: |
370 | close(fd); | |
371 | ||
372 | return -1; | |
373 | } | |
374 | ||
98963de4 | 375 | static void destroy_socket(void) |
68c1021b PMF |
376 | { |
377 | int result; | |
378 | ||
379 | if(mysocketfile[0] == '\0') | |
380 | return; | |
381 | ||
382 | result = unlink(mysocketfile); | |
383 | if(result == -1) { | |
384 | PERROR("unlink"); | |
385 | } | |
386 | } | |
387 | ||
98963de4 | 388 | static int init_signal_handler(void) |
68c1021b PMF |
389 | { |
390 | /* Attempt to handler SIGIO. If the main program wants to | |
391 | * handle it, fine, it'll override us. They it'll have to | |
392 | * use the chaining function. | |
393 | */ | |
394 | ||
395 | int result; | |
396 | struct sigaction act; | |
397 | ||
398 | result = sigemptyset(&act.sa_mask); | |
399 | if(result == -1) { | |
400 | PERROR("sigemptyset"); | |
401 | return -1; | |
402 | } | |
403 | ||
404 | act.sa_handler = sighandler; | |
405 | act.sa_flags = SA_RESTART; | |
406 | ||
407 | /* Only defer ourselves. Also, try to restart interrupted | |
408 | * syscalls to disturb the traced program as little as possible. | |
409 | */ | |
410 | result = sigaction(SIGIO, &act, NULL); | |
411 | if(result == -1) { | |
412 | PERROR("sigaction"); | |
413 | return -1; | |
414 | } | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
20b37a31 | 419 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
420 | { |
421 | int result; | |
422 | ||
20b37a31 PMF |
423 | result = ltt_marker_connect(m->channel, m->name, "default"); |
424 | if(result) | |
425 | ERR("ltt_marker_connect"); | |
426 | ||
427 | DBG("just auto connected marker %s %s to probe default", m->channel, m->name); | |
428 | } | |
429 | ||
430 | static void __attribute__((constructor(101))) init0() | |
431 | { | |
432 | DBG("UST_AUTOPROBE constructor"); | |
433 | if(getenv("UST_AUTOPROBE")) { | |
434 | marker_set_new_marker_cb(auto_probe_connect); | |
435 | } | |
436 | } | |
437 | ||
a584bc4e PMF |
438 | static void fini(void); |
439 | ||
20b37a31 PMF |
440 | static void __attribute__((constructor(1000))) init() |
441 | { | |
442 | int result; | |
443 | ||
444 | DBG("UST_TRACE constructor"); | |
445 | ||
68c1021b PMF |
446 | mypid = getpid(); |
447 | ||
4db647c5 PMF |
448 | if(getenv("UST_TRACE")) { |
449 | char trace_name[] = "auto"; | |
450 | char trace_type[] = "ustrelay"; | |
451 | ||
452 | DBG("starting early tracing"); | |
453 | ||
454 | /* Ensure marker control is initialized */ | |
455 | init_marker_control(); | |
456 | ||
457 | /* Ensure relay is initialized */ | |
458 | init_ustrelay_transport(); | |
459 | ||
460 | /* Ensure markers are initialized */ | |
461 | init_markers(); | |
462 | ||
20b37a31 PMF |
463 | /* In case. */ |
464 | ltt_channels_register("ust"); | |
4db647c5 PMF |
465 | |
466 | result = ltt_trace_setup(trace_name); | |
467 | if(result < 0) { | |
468 | ERR("ltt_trace_setup failed"); | |
469 | return; | |
470 | } | |
471 | ||
472 | result = ltt_trace_set_type(trace_name, trace_type); | |
473 | if(result < 0) { | |
474 | ERR("ltt_trace_set_type failed"); | |
475 | return; | |
476 | } | |
477 | ||
478 | result = ltt_trace_alloc(trace_name); | |
479 | if(result < 0) { | |
480 | ERR("ltt_trace_alloc failed"); | |
481 | return; | |
482 | } | |
483 | ||
484 | result = ltt_trace_start(trace_name); | |
485 | if(result < 0) { | |
486 | ERR("ltt_trace_start failed"); | |
487 | return; | |
488 | } | |
a584bc4e | 489 | start_consumer(); |
4db647c5 PMF |
490 | } |
491 | ||
98963de4 PMF |
492 | /* Must create socket before signal handler to prevent races |
493 | * on pfd variable. | |
494 | */ | |
68c1021b | 495 | result = init_socket(); |
98963de4 PMF |
496 | if(result == -1) { |
497 | ERR("init_socket error"); | |
498 | return; | |
499 | } | |
500 | result = init_signal_handler(); | |
501 | if(result == -1) { | |
502 | ERR("init_signal_handler error"); | |
503 | return; | |
504 | } | |
68c1021b PMF |
505 | |
506 | return; | |
507 | ||
508 | /* should decrementally destroy stuff if error */ | |
509 | ||
510 | } | |
511 | ||
512 | /* This is only called if we terminate normally, not with an unhandled signal, | |
513 | * so we cannot rely on it. */ | |
514 | ||
98963de4 | 515 | static void __attribute__((destructor)) fini() |
68c1021b | 516 | { |
a584bc4e PMF |
517 | int result; |
518 | ||
519 | /* if trace running, finish it */ | |
520 | ||
521 | DBG("destructor stopping traces"); | |
522 | ||
523 | result = ltt_trace_stop("auto"); | |
524 | if(result == -1) { | |
525 | ERR("ltt_trace_stop error"); | |
526 | } | |
527 | ||
528 | result = ltt_trace_destroy("auto"); | |
529 | if(result == -1) { | |
530 | ERR("ltt_trace_destroy error"); | |
531 | } | |
532 | ||
533 | /* FIXME: wait for the consumer to be done */ | |
534 | sleep(10); | |
535 | ||
68c1021b PMF |
536 | destroy_socket(); |
537 | } |