6cecb9cf |
1 | /* lttd |
2 | * |
3 | * Linux Trace Toolkit Daemon |
4 | * |
bb01fdc6 |
5 | * This is a simple daemon that reads a few relay+debugfs channels and save |
6 | * them in a trace. |
6cecb9cf |
7 | * |
8 | * |
9 | * Copyright 2005 - |
10 | * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> |
11 | */ |
12 | |
4e4d11b3 |
13 | #ifdef HAVE_CONFIG_H |
13474e75 |
14 | #include <config.h> |
4e4d11b3 |
15 | #endif |
16 | |
c3e8c24f |
17 | #define _REENTRANT |
4e4d11b3 |
18 | #define _GNU_SOURCE |
c3e8c24f |
19 | #include <features.h> |
6cecb9cf |
20 | #include <stdio.h> |
af4061b2 |
21 | #include <unistd.h> |
6cecb9cf |
22 | #include <errno.h> |
23 | #include <sys/types.h> |
24 | #include <sys/stat.h> |
6cecb9cf |
25 | #include <stdlib.h> |
26 | #include <dirent.h> |
27 | #include <string.h> |
9e7dbe44 |
28 | #include <fcntl.h> |
29 | #include <sys/poll.h> |
af4061b2 |
30 | #include <sys/mman.h> |
31 | #include <signal.h> |
c3e8c24f |
32 | #include <pthread.h> |
af4061b2 |
33 | |
34 | /* Relayfs IOCTL */ |
35 | #include <asm/ioctl.h> |
36 | #include <asm/types.h> |
37 | |
38 | /* Get the next sub buffer that can be read. */ |
bb01fdc6 |
39 | #define RELAY_GET_SUBBUF _IOR(0xF4, 0x00,__u32) |
af4061b2 |
40 | /* Release the oldest reserved (by "get") sub buffer. */ |
bb01fdc6 |
41 | #define RELAY_PUT_SUBBUF _IOW(0xF4, 0x01,__u32) |
af4061b2 |
42 | /* returns the number of sub buffers in the per cpu channel. */ |
bb01fdc6 |
43 | #define RELAY_GET_N_SUBBUFS _IOR(0xF4, 0x02,__u32) |
af4061b2 |
44 | /* returns the size of the sub buffers. */ |
bb01fdc6 |
45 | #define RELAY_GET_SUBBUF_SIZE _IOR(0xF4, 0x03,__u32) |
af4061b2 |
46 | |
47 | |
6cecb9cf |
48 | |
49 | enum { |
50 | GET_SUBBUF, |
51 | PUT_SUBBUF, |
52 | GET_N_BUBBUFS, |
53 | GET_SUBBUF_SIZE |
54 | }; |
55 | |
56 | struct fd_pair { |
57 | int channel; |
58 | int trace; |
af4061b2 |
59 | unsigned int n_subbufs; |
60 | unsigned int subbuf_size; |
61 | void *mmap; |
22acb617 |
62 | pthread_mutex_t mutex; |
6cecb9cf |
63 | }; |
64 | |
65 | struct channel_trace_fd { |
66 | struct fd_pair *pair; |
67 | int num_pairs; |
68 | }; |
69 | |
d24c12e7 |
70 | static char *trace_name = NULL; |
71 | static char *channel_name = NULL; |
72 | static int daemon_mode = 0; |
73 | static int append_mode = 0; |
74 | static unsigned long num_threads = 1; |
af4061b2 |
75 | volatile static int quit_program = 0; /* For signal handler */ |
d24c12e7 |
76 | static int dump_flight_only = 0; |
77 | static int dump_normal_only = 0; |
6cecb9cf |
78 | |
79 | /* Args : |
80 | * |
81 | * -t directory Directory name of the trace to write to. Will be created. |
bb01fdc6 |
82 | * -c directory Root directory of the debugfs trace channels. |
6cecb9cf |
83 | * -d Run in background (daemon). |
9e7dbe44 |
84 | * -a Trace append mode. |
86a65fdb |
85 | * -s Send SIGUSR1 to parent when ready for IO. |
6cecb9cf |
86 | */ |
87 | void show_arguments(void) |
88 | { |
89 | printf("Please use the following arguments :\n"); |
90 | printf("\n"); |
91 | printf("-t directory Directory name of the trace to write to.\n" |
92 | " It will be created.\n"); |
bb01fdc6 |
93 | printf("-c directory Root directory of the debugfs trace channels.\n"); |
6cecb9cf |
94 | printf("-d Run in background (daemon).\n"); |
9e7dbe44 |
95 | printf("-a Append to an possibly existing trace.\n"); |
22acb617 |
96 | printf("-N Number of threads to start.\n"); |
d24c12e7 |
97 | printf("-f Dump only flight recorder channels.\n"); |
98 | printf("-n Dump only normal channels.\n"); |
6cecb9cf |
99 | printf("\n"); |
100 | } |
101 | |
102 | |
103 | /* parse_arguments |
104 | * |
105 | * Parses the command line arguments. |
106 | * |
107 | * Returns 1 if the arguments were correct, but doesn't ask for program |
108 | * continuation. Returns -1 if the arguments are incorrect, or 0 if OK. |
109 | */ |
110 | int parse_arguments(int argc, char **argv) |
111 | { |
112 | int ret = 0; |
113 | int argn = 1; |
114 | |
115 | if(argc == 2) { |
116 | if(strcmp(argv[1], "-h") == 0) { |
117 | return 1; |
118 | } |
119 | } |
120 | |
9e7dbe44 |
121 | while(argn < argc) { |
6cecb9cf |
122 | |
123 | switch(argv[argn][0]) { |
124 | case '-': |
125 | switch(argv[argn][1]) { |
126 | case 't': |
9e7dbe44 |
127 | if(argn+1 < argc) { |
128 | trace_name = argv[argn+1]; |
129 | argn++; |
130 | } |
6cecb9cf |
131 | break; |
132 | case 'c': |
9e7dbe44 |
133 | if(argn+1 < argc) { |
134 | channel_name = argv[argn+1]; |
135 | argn++; |
136 | } |
6cecb9cf |
137 | break; |
138 | case 'd': |
139 | daemon_mode = 1; |
140 | break; |
9e7dbe44 |
141 | case 'a': |
142 | append_mode = 1; |
143 | break; |
22acb617 |
144 | case 'N': |
c3e8c24f |
145 | if(argn+1 < argc) { |
146 | num_threads = strtoul(argv[argn+1], NULL, 0); |
147 | argn++; |
148 | } |
149 | break; |
d24c12e7 |
150 | case 'f': |
151 | dump_flight_only = 1; |
152 | break; |
153 | case 'n': |
154 | dump_normal_only = 1; |
155 | break; |
6cecb9cf |
156 | default: |
157 | printf("Invalid argument '%s'.\n", argv[argn]); |
158 | printf("\n"); |
159 | ret = -1; |
160 | } |
161 | break; |
162 | default: |
163 | printf("Invalid argument '%s'.\n", argv[argn]); |
164 | printf("\n"); |
165 | ret = -1; |
166 | } |
167 | argn++; |
168 | } |
169 | |
170 | if(trace_name == NULL) { |
171 | printf("Please specify a trace name.\n"); |
172 | printf("\n"); |
173 | ret = -1; |
174 | } |
175 | |
176 | if(channel_name == NULL) { |
177 | printf("Please specify a channel name.\n"); |
178 | printf("\n"); |
179 | ret = -1; |
180 | } |
181 | |
182 | return ret; |
183 | } |
184 | |
185 | void show_info(void) |
186 | { |
e7480f75 |
187 | printf("Linux Trace Toolkit Trace Daemon " VERSION "\n"); |
6cecb9cf |
188 | printf("\n"); |
bb01fdc6 |
189 | printf("Reading from debugfs directory : %s\n", channel_name); |
6cecb9cf |
190 | printf("Writing to trace directory : %s\n", trace_name); |
191 | printf("\n"); |
192 | } |
193 | |
194 | |
af4061b2 |
195 | /* signal handling */ |
196 | |
197 | static void handler(int signo) |
198 | { |
199 | printf("Signal %d received : exiting cleanly\n", signo); |
200 | quit_program = 1; |
201 | } |
202 | |
203 | |
204 | |
6cecb9cf |
205 | int open_channel_trace_pairs(char *subchannel_name, char *subtrace_name, |
206 | struct channel_trace_fd *fd_pairs) |
207 | { |
208 | DIR *channel_dir = opendir(subchannel_name); |
209 | struct dirent *entry; |
210 | struct stat stat_buf; |
211 | int ret; |
212 | char path_channel[PATH_MAX]; |
213 | int path_channel_len; |
214 | char *path_channel_ptr; |
215 | char path_trace[PATH_MAX]; |
216 | int path_trace_len; |
217 | char *path_trace_ptr; |
4d508021 |
218 | int open_ret = 0; |
6cecb9cf |
219 | |
220 | if(channel_dir == NULL) { |
221 | perror(subchannel_name); |
02ba971e |
222 | open_ret = ENOENT; |
4d508021 |
223 | goto end; |
6cecb9cf |
224 | } |
225 | |
6cecb9cf |
226 | printf("Creating trace subdirectory %s\n", subtrace_name); |
227 | ret = mkdir(subtrace_name, S_IRWXU|S_IRWXG|S_IRWXO); |
228 | if(ret == -1) { |
3986d00b |
229 | if(errno != EEXIST) { |
9e7dbe44 |
230 | perror(subtrace_name); |
4d508021 |
231 | open_ret = -1; |
02ba971e |
232 | goto end; |
9e7dbe44 |
233 | } |
6cecb9cf |
234 | } |
235 | |
236 | strncpy(path_channel, subchannel_name, PATH_MAX-1); |
237 | path_channel_len = strlen(path_channel); |
238 | path_channel[path_channel_len] = '/'; |
239 | path_channel_len++; |
240 | path_channel_ptr = path_channel + path_channel_len; |
241 | |
242 | strncpy(path_trace, subtrace_name, PATH_MAX-1); |
243 | path_trace_len = strlen(path_trace); |
244 | path_trace[path_trace_len] = '/'; |
245 | path_trace_len++; |
246 | path_trace_ptr = path_trace + path_trace_len; |
247 | |
248 | while((entry = readdir(channel_dir)) != NULL) { |
249 | |
250 | if(entry->d_name[0] == '.') continue; |
251 | |
252 | strncpy(path_channel_ptr, entry->d_name, PATH_MAX - path_channel_len); |
253 | strncpy(path_trace_ptr, entry->d_name, PATH_MAX - path_trace_len); |
254 | |
255 | ret = stat(path_channel, &stat_buf); |
256 | if(ret == -1) { |
257 | perror(path_channel); |
258 | continue; |
259 | } |
260 | |
261 | printf("Channel file : %s\n", path_channel); |
262 | |
263 | if(S_ISDIR(stat_buf.st_mode)) { |
264 | |
265 | printf("Entering channel subdirectory...\n"); |
266 | ret = open_channel_trace_pairs(path_channel, path_trace, fd_pairs); |
267 | if(ret < 0) continue; |
9e7dbe44 |
268 | } else if(S_ISREG(stat_buf.st_mode)) { |
d24c12e7 |
269 | if(strncmp(entry->d_name, "flight-", sizeof("flight-")-1) != 0) { |
270 | if(dump_flight_only) { |
271 | printf("Skipping normal channel %s\n", path_channel); |
272 | continue; |
273 | } |
274 | } else { |
275 | if(dump_normal_only) { |
276 | printf("Skipping flight channel %s\n", path_channel); |
277 | continue; |
278 | } |
279 | } |
9e7dbe44 |
280 | printf("Opening file.\n"); |
281 | |
282 | fd_pairs->pair = realloc(fd_pairs->pair, |
283 | ++fd_pairs->num_pairs * sizeof(struct fd_pair)); |
284 | |
285 | /* Open the channel in read mode */ |
286 | fd_pairs->pair[fd_pairs->num_pairs-1].channel = |
287 | open(path_channel, O_RDONLY | O_NONBLOCK); |
288 | if(fd_pairs->pair[fd_pairs->num_pairs-1].channel == -1) { |
289 | perror(path_channel); |
13474e75 |
290 | fd_pairs->num_pairs--; |
291 | continue; |
9e7dbe44 |
292 | } |
293 | /* Open the trace in write mode, only append if append_mode */ |
294 | ret = stat(path_trace, &stat_buf); |
295 | if(ret == 0) { |
296 | if(append_mode) { |
251b5c5e |
297 | printf("Appending to file %s as requested\n", path_trace); |
9e7dbe44 |
298 | |
299 | fd_pairs->pair[fd_pairs->num_pairs-1].trace = |
300 | open(path_trace, O_WRONLY|O_APPEND, |
301 | S_IRWXU|S_IRWXG|S_IRWXO); |
302 | |
303 | if(fd_pairs->pair[fd_pairs->num_pairs-1].trace == -1) { |
304 | perror(path_trace); |
305 | } |
306 | } else { |
307 | printf("File %s exists, cannot open. Try append mode.\n", path_trace); |
02ba971e |
308 | open_ret = -1; |
4d508021 |
309 | goto end; |
9e7dbe44 |
310 | } |
311 | } else { |
312 | if(errno == ENOENT) { |
313 | fd_pairs->pair[fd_pairs->num_pairs-1].trace = |
314 | open(path_trace, O_WRONLY|O_CREAT|O_EXCL, |
315 | S_IRWXU|S_IRWXG|S_IRWXO); |
316 | if(fd_pairs->pair[fd_pairs->num_pairs-1].trace == -1) { |
317 | perror(path_trace); |
318 | } |
319 | } |
320 | } |
6cecb9cf |
321 | } |
6cecb9cf |
322 | } |
323 | |
02ba971e |
324 | end: |
6cecb9cf |
325 | closedir(channel_dir); |
326 | |
02ba971e |
327 | return open_ret; |
6cecb9cf |
328 | } |
329 | |
af4061b2 |
330 | |
331 | int read_subbuffer(struct fd_pair *pair) |
332 | { |
12bcec97 |
333 | unsigned int consumed_old; |
22acb617 |
334 | int err, ret=0; |
af4061b2 |
335 | |
336 | |
bb01fdc6 |
337 | err = ioctl(pair->channel, RELAY_GET_SUBBUF, |
12bcec97 |
338 | &consumed_old); |
339 | printf("cookie : %u\n", consumed_old); |
13474e75 |
340 | if(err != 0) { |
22acb617 |
341 | ret = errno; |
63bf9ed1 |
342 | perror("Reserving sub buffer failed (everything is normal, it is due to concurrency)"); |
13474e75 |
343 | goto get_error; |
af4061b2 |
344 | } |
13474e75 |
345 | |
346 | err = TEMP_FAILURE_RETRY(write(pair->trace, |
2312de30 |
347 | pair->mmap |
348 | + (consumed_old & ((pair->n_subbufs * pair->subbuf_size)-1)), |
af4061b2 |
349 | pair->subbuf_size)); |
13474e75 |
350 | |
351 | if(err < 0) { |
22acb617 |
352 | ret = errno; |
af4061b2 |
353 | perror("Error in writing to file"); |
13474e75 |
354 | goto write_error; |
af4061b2 |
355 | } |
c5fdfca5 |
356 | #if 0 |
357 | err = fsync(pair->trace); |
358 | if(err < 0) { |
359 | ret = errno; |
360 | perror("Error in writing to file"); |
361 | goto write_error; |
362 | } |
363 | #endif //0 |
13474e75 |
364 | write_error: |
bb01fdc6 |
365 | err = ioctl(pair->channel, RELAY_PUT_SUBBUF, &consumed_old); |
13474e75 |
366 | if(err != 0) { |
22acb617 |
367 | ret = errno; |
63bf9ed1 |
368 | if(errno == EFAULT) { |
22acb617 |
369 | perror("Error in unreserving sub buffer\n"); |
63bf9ed1 |
370 | } else if(errno == EIO) { |
12bcec97 |
371 | perror("Reader has been pushed by the writer, last subbuffer corrupted."); |
db9d75c0 |
372 | /* FIXME : we may delete the last written buffer if we wish. */ |
12bcec97 |
373 | } |
13474e75 |
374 | goto get_error; |
af4061b2 |
375 | } |
376 | |
13474e75 |
377 | get_error: |
378 | return ret; |
af4061b2 |
379 | } |
380 | |
381 | |
6cecb9cf |
382 | |
c3e8c24f |
383 | int map_channels(struct channel_trace_fd *fd_pairs) |
6cecb9cf |
384 | { |
af4061b2 |
385 | int i,j; |
c3e8c24f |
386 | int ret=0; |
af4061b2 |
387 | |
13474e75 |
388 | if(fd_pairs->num_pairs <= 0) { |
389 | printf("No channel to read\n"); |
390 | goto end; |
391 | } |
392 | |
af4061b2 |
393 | /* Get the subbuf sizes and number */ |
394 | |
395 | for(i=0;i<fd_pairs->num_pairs;i++) { |
396 | struct fd_pair *pair = &fd_pairs->pair[i]; |
9e7dbe44 |
397 | |
bb01fdc6 |
398 | ret = ioctl(pair->channel, RELAY_GET_N_SUBBUFS, |
af4061b2 |
399 | &pair->n_subbufs); |
400 | if(ret != 0) { |
401 | perror("Error in getting the number of subbuffers"); |
402 | goto end; |
403 | } |
bb01fdc6 |
404 | ret = ioctl(pair->channel, RELAY_GET_SUBBUF_SIZE, |
af4061b2 |
405 | &pair->subbuf_size); |
406 | if(ret != 0) { |
407 | perror("Error in getting the size of the subbuffers"); |
408 | goto end; |
409 | } |
22acb617 |
410 | ret = pthread_mutex_init(&pair->mutex, NULL); /* Fast mutex */ |
411 | if(ret != 0) { |
412 | perror("Error in mutex init"); |
413 | goto end; |
414 | } |
af4061b2 |
415 | } |
416 | |
417 | /* Mmap each FD */ |
418 | for(i=0;i<fd_pairs->num_pairs;i++) { |
419 | struct fd_pair *pair = &fd_pairs->pair[i]; |
420 | |
421 | pair->mmap = mmap(0, pair->subbuf_size * pair->n_subbufs, PROT_READ, |
422 | MAP_SHARED, pair->channel, 0); |
423 | if(pair->mmap == MAP_FAILED) { |
424 | perror("Mmap error"); |
425 | goto munmap; |
426 | } |
427 | } |
428 | |
22acb617 |
429 | goto end; /* success */ |
af4061b2 |
430 | |
c3e8c24f |
431 | /* Error handling */ |
432 | /* munmap only the successfully mmapped indexes */ |
433 | munmap: |
434 | /* Munmap each FD */ |
435 | for(j=0;j<i;j++) { |
436 | struct fd_pair *pair = &fd_pairs->pair[j]; |
437 | int err_ret; |
438 | |
439 | err_ret = munmap(pair->mmap, pair->subbuf_size * pair->n_subbufs); |
440 | if(err_ret != 0) { |
441 | perror("Error in munmap"); |
442 | } |
443 | ret |= err_ret; |
444 | } |
445 | |
446 | end: |
447 | return ret; |
448 | |
449 | |
450 | } |
451 | |
452 | |
453 | int unmap_channels(struct channel_trace_fd *fd_pairs) |
454 | { |
455 | int j; |
456 | int ret=0; |
457 | |
458 | /* Munmap each FD */ |
459 | for(j=0;j<fd_pairs->num_pairs;j++) { |
460 | struct fd_pair *pair = &fd_pairs->pair[j]; |
461 | int err_ret; |
462 | |
463 | err_ret = munmap(pair->mmap, pair->subbuf_size * pair->n_subbufs); |
464 | if(err_ret != 0) { |
465 | perror("Error in munmap"); |
466 | } |
467 | ret |= err_ret; |
22acb617 |
468 | err_ret = pthread_mutex_destroy(&pair->mutex); |
469 | if(err_ret != 0) { |
470 | perror("Error in mutex destroy"); |
471 | } |
472 | ret |= err_ret; |
c3e8c24f |
473 | } |
474 | |
475 | return ret; |
476 | } |
477 | |
478 | |
479 | /* read_channels |
22acb617 |
480 | * |
481 | * Thread worker. |
c3e8c24f |
482 | * |
bb01fdc6 |
483 | * Read the debugfs channels and write them in the paired tracefiles. |
c3e8c24f |
484 | * |
485 | * @fd_pairs : paired channels and trace files. |
486 | * |
22acb617 |
487 | * returns (void*)0 on success, (void*)-1 on error. |
c3e8c24f |
488 | * |
489 | * Note that the high priority polled channels are consumed first. We then poll |
490 | * again to see if these channels are still in priority. Only when no |
491 | * high priority channel is left, we start reading low priority channels. |
492 | * |
493 | * Note that a channel is considered high priority when the buffer is almost |
494 | * full. |
495 | */ |
496 | |
22acb617 |
497 | void * read_channels(void *arg) |
c3e8c24f |
498 | { |
499 | struct pollfd *pollfd; |
500 | int i,j; |
501 | int num_rdy, num_hup; |
502 | int high_prio; |
22acb617 |
503 | int ret = 0; |
504 | struct channel_trace_fd *fd_pairs = (struct channel_trace_fd *)arg; |
c3e8c24f |
505 | |
af4061b2 |
506 | /* Start polling the FD */ |
507 | |
9e7dbe44 |
508 | pollfd = malloc(fd_pairs->num_pairs * sizeof(struct pollfd)); |
509 | |
af4061b2 |
510 | /* Note : index in pollfd is the same index as fd_pair->pair */ |
9e7dbe44 |
511 | for(i=0;i<fd_pairs->num_pairs;i++) { |
512 | pollfd[i].fd = fd_pairs->pair[i].channel; |
513 | pollfd[i].events = POLLIN|POLLPRI; |
514 | } |
515 | |
516 | while(1) { |
68047576 |
517 | high_prio = 0; |
af4061b2 |
518 | num_hup = 0; |
519 | #ifdef DEBUG |
520 | printf("Press a key for next poll...\n"); |
521 | char buf[1]; |
522 | read(STDIN_FILENO, &buf, 1); |
13474e75 |
523 | printf("Next poll (polling %d fd) :\n", fd_pairs->num_pairs); |
af4061b2 |
524 | #endif //DEBUG |
525 | |
526 | /* Have we received a signal ? */ |
527 | if(quit_program) break; |
528 | |
9e7dbe44 |
529 | num_rdy = poll(pollfd, fd_pairs->num_pairs, -1); |
530 | if(num_rdy == -1) { |
531 | perror("Poll error"); |
af4061b2 |
532 | goto free_fd; |
9e7dbe44 |
533 | } |
534 | |
535 | printf("Data received\n"); |
536 | |
537 | for(i=0;i<fd_pairs->num_pairs;i++) { |
538 | switch(pollfd[i].revents) { |
539 | case POLLERR: |
540 | printf("Error returned in polling fd %d.\n", pollfd[i].fd); |
af4061b2 |
541 | num_hup++; |
9e7dbe44 |
542 | break; |
543 | case POLLHUP: |
544 | printf("Polling fd %d tells it has hung up.\n", pollfd[i].fd); |
af4061b2 |
545 | num_hup++; |
9e7dbe44 |
546 | break; |
547 | case POLLNVAL: |
548 | printf("Polling fd %d tells fd is not open.\n", pollfd[i].fd); |
af4061b2 |
549 | num_hup++; |
9e7dbe44 |
550 | break; |
551 | case POLLPRI: |
22acb617 |
552 | if(pthread_mutex_trylock(&fd_pairs->pair[i].mutex) == 0) { |
553 | printf("Urgent read on fd %d\n", pollfd[i].fd); |
554 | /* Take care of high priority channels first. */ |
555 | high_prio = 1; |
556 | /* it's ok to have an unavailable subbuffer */ |
557 | ret = read_subbuffer(&fd_pairs->pair[i]); |
63bf9ed1 |
558 | if(ret == EAGAIN) ret = 0; |
b8d28629 |
559 | |
22acb617 |
560 | ret = pthread_mutex_unlock(&fd_pairs->pair[i].mutex); |
561 | if(ret) |
562 | printf("Error in mutex unlock : %s\n", strerror(ret)); |
563 | } |
9e7dbe44 |
564 | break; |
68047576 |
565 | } |
9e7dbe44 |
566 | } |
af4061b2 |
567 | /* If every FD has hung up, we end the read loop here */ |
568 | if(num_hup == fd_pairs->num_pairs) break; |
9e7dbe44 |
569 | |
68047576 |
570 | if(!high_prio) { |
571 | for(i=0;i<fd_pairs->num_pairs;i++) { |
572 | switch(pollfd[i].revents) { |
573 | case POLLIN: |
22acb617 |
574 | if(pthread_mutex_trylock(&fd_pairs->pair[i].mutex) == 0) { |
575 | /* Take care of low priority channels. */ |
576 | printf("Normal read on fd %d\n", pollfd[i].fd); |
577 | /* it's ok to have an unavailable subbuffer */ |
578 | ret = read_subbuffer(&fd_pairs->pair[i]); |
63bf9ed1 |
579 | if(ret == EAGAIN) ret = 0; |
b8d28629 |
580 | |
22acb617 |
581 | ret = pthread_mutex_unlock(&fd_pairs->pair[i].mutex); |
582 | if(ret) |
583 | printf("Error in mutex unlock : %s\n", strerror(ret)); |
584 | } |
68047576 |
585 | break; |
586 | } |
587 | } |
9e7dbe44 |
588 | } |
589 | |
590 | } |
591 | |
af4061b2 |
592 | free_fd: |
9e7dbe44 |
593 | free(pollfd); |
594 | |
af4061b2 |
595 | end: |
22acb617 |
596 | return (void*)ret; |
6cecb9cf |
597 | } |
598 | |
599 | |
600 | void close_channel_trace_pairs(struct channel_trace_fd *fd_pairs) |
601 | { |
9e7dbe44 |
602 | int i; |
603 | int ret; |
6cecb9cf |
604 | |
9e7dbe44 |
605 | for(i=0;i<fd_pairs->num_pairs;i++) { |
606 | ret = close(fd_pairs->pair[i].channel); |
607 | if(ret == -1) perror("Close error on channel"); |
608 | ret = close(fd_pairs->pair[i].trace); |
609 | if(ret == -1) perror("Close error on trace"); |
610 | } |
611 | free(fd_pairs->pair); |
6cecb9cf |
612 | } |
613 | |
614 | int main(int argc, char ** argv) |
615 | { |
c3e8c24f |
616 | int ret = 0; |
6cecb9cf |
617 | struct channel_trace_fd fd_pairs = { NULL, 0 }; |
af4061b2 |
618 | struct sigaction act; |
22acb617 |
619 | pthread_t *tids; |
620 | unsigned int i; |
621 | void *tret; |
6cecb9cf |
622 | |
623 | ret = parse_arguments(argc, argv); |
624 | |
625 | if(ret != 0) show_arguments(); |
626 | if(ret < 0) return EINVAL; |
627 | if(ret > 0) return 0; |
628 | |
629 | show_info(); |
630 | |
631 | if(daemon_mode) { |
4d20e474 |
632 | ret = daemon(0, 0); |
4d508021 |
633 | |
634 | if(ret == -1) { |
635 | perror("An error occured while daemonizing."); |
636 | exit(-1); |
637 | } |
638 | } |
6cecb9cf |
639 | |
af4061b2 |
640 | /* Connect the signal handlers */ |
641 | act.sa_handler = handler; |
642 | act.sa_flags = 0; |
643 | sigemptyset(&(act.sa_mask)); |
644 | sigaddset(&(act.sa_mask), SIGTERM); |
645 | sigaddset(&(act.sa_mask), SIGQUIT); |
646 | sigaddset(&(act.sa_mask), SIGINT); |
647 | sigaction(SIGTERM, &act, NULL); |
648 | sigaction(SIGQUIT, &act, NULL); |
649 | sigaction(SIGINT, &act, NULL); |
650 | |
c3e8c24f |
651 | |
6cecb9cf |
652 | if(ret = open_channel_trace_pairs(channel_name, trace_name, &fd_pairs)) |
9e7dbe44 |
653 | goto close_channel; |
6cecb9cf |
654 | |
c3e8c24f |
655 | if(ret = map_channels(&fd_pairs)) |
656 | goto close_channel; |
657 | |
22acb617 |
658 | tids = malloc(sizeof(pthread_t) * num_threads); |
659 | for(i=0; i<num_threads; i++) { |
660 | ret = pthread_create(&tids[i], NULL, read_channels, &fd_pairs); |
661 | if(ret) { |
662 | perror("Error creating thread"); |
663 | break; |
664 | } |
665 | } |
6cecb9cf |
666 | |
22acb617 |
667 | for(i=0; i<num_threads; i++) { |
668 | ret = pthread_join(tids[i], &tret); |
669 | if(ret) { |
670 | perror("Error joining thread"); |
671 | break; |
672 | } |
673 | if((int)tret != 0) { |
c5fdfca5 |
674 | printf("Error %s occured in thread %u\n", strerror((int)tret), i); |
22acb617 |
675 | } |
676 | } |
677 | |
678 | free(tids); |
679 | |
c3e8c24f |
680 | ret |= unmap_channels(&fd_pairs); |
681 | |
9e7dbe44 |
682 | close_channel: |
6cecb9cf |
683 | close_channel_trace_pairs(&fd_pairs); |
684 | |
6cecb9cf |
685 | return ret; |
686 | } |