2cdb6fcb |
1 | /* lttctl |
2 | * |
3 | * Linux Trace Toolkit Control |
4 | * |
5 | * Small program that controls LTT through libltt. |
6 | * |
7 | * Copyright 2005 - |
8 | * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> |
9 | */ |
10 | |
4e4d11b3 |
11 | #ifdef HAVE_CONFIG_H |
12 | #include <config.h> |
13 | #endif |
14 | |
5adba60f |
15 | #include <libltt/libltt.h> |
16 | #include <errno.h> |
17 | #include <stdio.h> |
18 | #include <stdlib.h> |
19 | #include <sys/types.h> |
86a65fdb |
20 | #include <sys/wait.h> |
5adba60f |
21 | #include <unistd.h> |
22 | #include <signal.h> |
d5fbdb60 |
23 | #include <dirent.h> |
24 | #include <string.h> |
25 | #include <sys/stat.h> |
26 | |
27 | /* Buffer for file copy : 4k seems optimal. */ |
28 | #define BUF_SIZE 4194304 |
2cdb6fcb |
29 | |
5adba60f |
30 | enum trace_ctl_op { |
b7f08766 |
31 | CTL_OP_CREATE_START, |
5adba60f |
32 | CTL_OP_CREATE, |
33 | CTL_OP_DESTROY, |
b7f08766 |
34 | CTL_OP_STOP_DESTROY, |
5adba60f |
35 | CTL_OP_START, |
36 | CTL_OP_STOP, |
37 | CTL_OP_DAEMON, |
129fd24a |
38 | CTL_OP_DESCRIPTION, |
5adba60f |
39 | CTL_OP_NONE |
40 | }; |
2cdb6fcb |
41 | |
5adba60f |
42 | static char *trace_name = NULL; |
43 | static char *mode_name = NULL; |
988614ed |
44 | static unsigned subbuf_size = 0; |
45 | static unsigned n_subbufs = 0; |
45653836 |
46 | static unsigned append_trace = 0; |
5adba60f |
47 | static enum trace_mode mode = LTT_TRACE_NORMAL; |
48 | static enum trace_ctl_op op = CTL_OP_NONE; |
49 | static char *channel_root = NULL; |
50 | static char *trace_root = NULL; |
51 | |
86a65fdb |
52 | static int sigchld_received = 0; |
ada84671 |
53 | |
86a65fdb |
54 | void sigchld_handler(int signo) |
5adba60f |
55 | { |
56 | printf("signal %d received\n", signo); |
86a65fdb |
57 | sigchld_received = 1; |
5adba60f |
58 | } |
59 | |
60 | |
61 | /* Args : |
62 | * |
63 | */ |
64 | void show_arguments(void) |
65 | { |
66 | printf("Please use the following arguments :\n"); |
67 | printf("\n"); |
68 | printf("-n name Name of the trace.\n"); |
b7f08766 |
69 | printf("-b Create trace channels and start tracing (no daemon).\n"); |
bc0fcb31 |
70 | printf("-c Create trace channels.\n"); |
71 | printf("-m mode Normal or flight recorder mode.\n"); |
5adba60f |
72 | printf(" Mode values : normal (default) or flight.\n"); |
73 | printf("-r Destroy trace channels.\n"); |
b7f08766 |
74 | printf("-R Stop tracing and destroy trace channels.\n"); |
5adba60f |
75 | printf("-s Start tracing.\n"); |
76 | //printf(" Note : will automatically create a normal trace if " |
77 | // "none exists.\n"); |
78 | printf("-q Stop tracing.\n"); |
79 | printf("-d Create trace, spawn a lttd daemon, start tracing.\n"); |
d5fbdb60 |
80 | printf(" (optionnaly, you can set LTT_DAEMON\n"); |
81 | printf(" and the LTT_FACILITIES env. vars.)\n"); |
5adba60f |
82 | printf("-t Trace root path. (ex. /root/traces/example_trace)\n"); |
83 | printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n"); |
4085af66 |
84 | printf("-z Size of the subbuffers (will be rounded to next page size)\n"); |
988614ed |
85 | printf("-x Number of subbuffers\n"); |
129fd24a |
86 | printf("-e Get XML facilities description\n"); |
45653836 |
87 | printf("-a Append to trace\n"); |
5adba60f |
88 | printf("\n"); |
89 | } |
90 | |
91 | |
92 | /* parse_arguments |
93 | * |
94 | * Parses the command line arguments. |
95 | * |
96 | * Returns 1 if the arguments were correct, but doesn't ask for program |
97 | * continuation. Returns -1 if the arguments are incorrect, or 0 if OK. |
98 | */ |
99 | int parse_arguments(int argc, char **argv) |
100 | { |
101 | int ret = 0; |
102 | int argn = 1; |
103 | |
104 | if(argc == 2) { |
105 | if(strcmp(argv[1], "-h") == 0) { |
106 | return 1; |
107 | } |
108 | } |
109 | |
110 | while(argn < argc) { |
111 | |
112 | switch(argv[argn][0]) { |
113 | case '-': |
114 | switch(argv[argn][1]) { |
115 | case 'n': |
116 | if(argn+1 < argc) { |
117 | trace_name = argv[argn+1]; |
118 | argn++; |
119 | } else { |
120 | printf("Specify a trace name after -n.\n", argv[argn]); |
121 | printf("\n"); |
122 | ret = -1; |
123 | } |
124 | |
125 | break; |
b7f08766 |
126 | case 'b': |
127 | op = CTL_OP_CREATE_START; |
5adba60f |
128 | case 'c': |
129 | op = CTL_OP_CREATE; |
bc0fcb31 |
130 | break; |
131 | case 'm': |
5adba60f |
132 | if(argn+1 < argc) { |
133 | mode_name = argv[argn+1]; |
134 | argn++; |
135 | if(strcmp(mode_name, "normal") == 0) |
136 | mode = LTT_TRACE_NORMAL; |
137 | else if(strcmp(mode_name, "flight") == 0) |
138 | mode = LTT_TRACE_FLIGHT; |
139 | else { |
140 | printf("Invalid mode '%s'.\n", argv[argn]); |
141 | printf("\n"); |
142 | ret = -1; |
143 | } |
144 | } else { |
bc0fcb31 |
145 | printf("Specify a mode after -m.\n"); |
5adba60f |
146 | printf("\n"); |
147 | ret = -1; |
148 | } |
149 | break; |
150 | case 'r': |
151 | op = CTL_OP_DESTROY; |
152 | break; |
b7f08766 |
153 | case 'R': |
154 | op = CTL_OP_STOP_DESTROY; |
155 | break; |
5adba60f |
156 | case 's': |
157 | op = CTL_OP_START; |
158 | break; |
159 | case 'q': |
160 | op = CTL_OP_STOP; |
161 | break; |
988614ed |
162 | case 'z': |
163 | if(argn+1 < argc) { |
164 | subbuf_size = (unsigned)atoi(argv[argn+1]); |
165 | argn++; |
166 | } else { |
167 | printf("Specify a number of subbuffers after -z.\n"); |
168 | printf("\n"); |
169 | ret = -1; |
170 | } |
171 | break; |
172 | case 'x': |
173 | if(argn+1 < argc) { |
174 | n_subbufs = (unsigned)atoi(argv[argn+1]); |
175 | argn++; |
176 | } else { |
177 | printf("Specify a subbuffer size after -x.\n"); |
178 | printf("\n"); |
179 | ret = -1; |
180 | } |
181 | break; |
5adba60f |
182 | case 'd': |
183 | op = CTL_OP_DAEMON; |
184 | break; |
129fd24a |
185 | case 'e': |
186 | op = CTL_OP_DESCRIPTION; |
187 | break; |
5adba60f |
188 | case 't': |
189 | if(argn+1 < argc) { |
190 | trace_root = argv[argn+1]; |
191 | argn++; |
192 | } else { |
988614ed |
193 | printf("Specify a trace root path after -t.\n"); |
5adba60f |
194 | printf("\n"); |
195 | ret = -1; |
196 | } |
197 | break; |
198 | case 'l': |
199 | if(argn+1 < argc) { |
200 | channel_root = argv[argn+1]; |
201 | argn++; |
202 | } else { |
988614ed |
203 | printf("Specify a channel root path after -l.\n"); |
5adba60f |
204 | printf("\n"); |
205 | ret = -1; |
206 | } |
207 | break; |
45653836 |
208 | case 'a': |
209 | append_trace = 1; |
210 | break; |
5adba60f |
211 | default: |
212 | printf("Invalid argument '%s'.\n", argv[argn]); |
213 | printf("\n"); |
214 | ret = -1; |
215 | } |
216 | break; |
217 | default: |
218 | printf("Invalid argument '%s'.\n", argv[argn]); |
219 | printf("\n"); |
220 | ret = -1; |
221 | } |
222 | argn++; |
223 | } |
224 | |
129fd24a |
225 | if(op != CTL_OP_DESCRIPTION && trace_name == NULL) { |
5adba60f |
226 | printf("Please specify a trace name.\n"); |
227 | printf("\n"); |
228 | ret = -1; |
229 | } |
230 | |
231 | if(op == CTL_OP_NONE) { |
232 | printf("Please specify an operation.\n"); |
233 | printf("\n"); |
234 | ret = -1; |
235 | } |
236 | |
237 | if(op == CTL_OP_DAEMON) { |
238 | if(trace_root == NULL) { |
239 | printf("Please specify -t trace_root_path with the -d option.\n"); |
240 | printf("\n"); |
241 | ret = -1; |
242 | } |
243 | if(channel_root == NULL) { |
244 | printf("Please specify -l ltt_root_path with the -d option.\n"); |
245 | printf("\n"); |
246 | ret = -1; |
247 | } |
248 | } |
249 | |
129fd24a |
250 | if(op == CTL_OP_DESCRIPTION) { |
251 | if(trace_root == NULL) { |
252 | printf("Please specify -t trace_root_path with the -e option.\n"); |
253 | printf("\n"); |
254 | ret = -1; |
255 | } |
256 | } |
257 | |
5adba60f |
258 | return ret; |
259 | } |
260 | |
261 | void show_info(void) |
262 | { |
263 | printf("Linux Trace Toolkit Trace Control\n"); |
264 | printf("\n"); |
129fd24a |
265 | if(trace_name != NULL) { |
266 | printf("Controlling trace : %s\n", trace_name); |
267 | printf("\n"); |
268 | } |
269 | } |
270 | |
271 | int create_eventdefs(void) |
272 | { |
273 | int ret = 0; |
274 | char eventdefs_path[PATH_MAX]; |
275 | char eventdefs_file[PATH_MAX]; |
276 | char facilities_file[PATH_MAX]; |
277 | char read_buf[BUF_SIZE]; |
278 | struct dirent *entry; |
279 | char *facilities_path = getenv("LTT_FACILITIES"); |
280 | if(facilities_path == NULL) facilities_path = |
86a65fdb |
281 | PACKAGE_DATA_DIR "/" PACKAGE "/facilities"; |
129fd24a |
282 | |
283 | ret = mkdir(trace_root, S_IRWXU|S_IRWXG|S_IRWXO); |
284 | if(ret == -1 && errno != EEXIST) { |
285 | perror("Cannot create trace_root directory"); |
286 | printf("trace_root is %s\n", trace_root); |
287 | goto error; |
288 | } |
bd55296c |
289 | ret = 0; |
129fd24a |
290 | |
291 | size_t trace_root_len = strlen(trace_root); |
292 | strncpy(eventdefs_path, trace_root, PATH_MAX); |
293 | strncat(eventdefs_path, "/eventdefs/", PATH_MAX - trace_root_len); |
294 | size_t eventdefs_path_len = strlen(eventdefs_path); |
295 | ret = mkdir(eventdefs_path, S_IRWXU|S_IRWXG|S_IRWXO); |
45653836 |
296 | if(ret == -1 && (!append_trace || errno != EEXIST)) { |
129fd24a |
297 | perror("Cannot create eventdefs directory"); |
298 | goto error; |
299 | } |
bd55296c |
300 | ret = 0; |
129fd24a |
301 | |
302 | DIR *facilities_dir = opendir(facilities_path); |
303 | |
86a65fdb |
304 | if(facilities_dir == NULL) { |
305 | perror("Cannot open facilities directory"); |
306 | ret = -1; |
307 | goto error; |
308 | } |
309 | |
129fd24a |
310 | while((entry = readdir(facilities_dir)) != NULL) { |
311 | if(entry->d_name[0] == '.') continue; |
312 | |
313 | printf("Appending facility file %s\n", entry->d_name); |
314 | strncpy(eventdefs_file, eventdefs_path, PATH_MAX); |
315 | strncat(eventdefs_file, entry->d_name, PATH_MAX - eventdefs_path_len); |
316 | /* Append to the file */ |
317 | FILE *dest = fopen(eventdefs_file, "a"); |
318 | if(!dest) { |
319 | perror("Cannot create eventdefs file"); |
320 | continue; |
321 | } |
322 | strncpy(facilities_file, facilities_path, PATH_MAX); |
323 | size_t facilities_dir_len = strlen(facilities_path); |
324 | strncat(facilities_file, "/", PATH_MAX - facilities_dir_len); |
325 | strncat(facilities_file, entry->d_name, PATH_MAX - facilities_dir_len-1); |
326 | FILE *src = fopen(facilities_file, "r"); |
327 | if(!src) { |
328 | perror("Cannot open eventdefs file for reading"); |
329 | goto close_dest; |
330 | } |
331 | |
332 | do { |
333 | size_t read_size, write_size; |
334 | read_size = fread(read_buf, sizeof(char), BUF_SIZE, src); |
335 | if(ferror(src)) { |
336 | perror("Cannot read eventdefs file"); |
337 | goto close_src; |
338 | } |
339 | write_size = fwrite(read_buf, sizeof(char), read_size, dest); |
340 | if(ferror(dest)) { |
341 | perror("Cannot write eventdefs file"); |
342 | goto close_src; |
343 | } |
344 | } while(!feof(src)); |
345 | |
346 | /* Add spacing between facilities */ |
347 | fwrite("\n", 1, 1, dest); |
348 | |
349 | close_src: |
350 | fclose(src); |
351 | close_dest: |
352 | fclose(dest); |
353 | } |
354 | |
355 | closedir(facilities_dir); |
356 | |
86a65fdb |
357 | error: |
129fd24a |
358 | return ret; |
359 | |
5adba60f |
360 | } |
361 | |
129fd24a |
362 | |
5adba60f |
363 | int lttctl_daemon(struct lttctl_handle *handle, char *trace_name) |
364 | { |
365 | char channel_path[PATH_MAX] = ""; |
366 | pid_t pid; |
367 | int ret; |
368 | char *lttd_path = getenv("LTT_DAEMON"); |
369 | struct sigaction act; |
370 | |
86a65fdb |
371 | if(lttd_path == NULL) lttd_path = |
372 | PACKAGE_BIN_DIR "/lttd"; |
5adba60f |
373 | |
374 | strcat(channel_path, channel_root); |
375 | strcat(channel_path, "/"); |
376 | strcat(channel_path, trace_name); |
377 | |
378 | |
988614ed |
379 | ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, n_subbufs); |
5adba60f |
380 | if(ret != 0) goto create_error; |
381 | |
86a65fdb |
382 | act.sa_handler = sigchld_handler; |
5adba60f |
383 | sigemptyset(&(act.sa_mask)); |
86a65fdb |
384 | sigaddset(&(act.sa_mask), SIGCHLD); |
385 | sigaction(SIGCHLD, &act, NULL); |
ada84671 |
386 | |
5adba60f |
387 | pid = fork(); |
388 | |
389 | if(pid > 0) { |
86a65fdb |
390 | int status; |
5adba60f |
391 | /* parent */ |
86a65fdb |
392 | while(!(sigchld_received)) pause(); |
393 | |
394 | waitpid(pid, &status, 0); |
395 | ret = 0; |
396 | if(WIFEXITED(status)) |
397 | ret = WEXITSTATUS(status); |
398 | if(ret) goto start_error; |
5adba60f |
399 | |
5adba60f |
400 | printf("Creating supplementary trace files\n"); |
129fd24a |
401 | ret = create_eventdefs(); |
402 | if(ret) goto start_error; |
5adba60f |
403 | |
404 | } else if(pid == 0) { |
405 | /* child */ |
45653836 |
406 | int ret; |
407 | if(append_trace) |
408 | ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c", |
409 | channel_path, "-d", "-a", NULL); |
410 | else |
411 | ret = execlp(lttd_path, lttd_path, "-t", trace_root, "-c", |
412 | channel_path, "-d", NULL); |
5adba60f |
413 | if(ret) { |
414 | perror("Error in executing the lttd daemon"); |
415 | exit(-1); |
416 | } |
417 | } else { |
418 | /* error */ |
419 | perror("Error in forking for lttd daemon"); |
420 | |
421 | } |
422 | |
423 | ret = lttctl_start(handle, trace_name); |
424 | if(ret != 0) goto start_error; |
425 | |
426 | return 0; |
427 | |
428 | /* error handling */ |
429 | start_error: |
86a65fdb |
430 | printf("Trace start error\n"); |
5adba60f |
431 | ret |= lttctl_destroy_trace(handle, trace_name); |
432 | create_error: |
433 | return ret; |
434 | } |
435 | |
436 | int main(int argc, char ** argv) |
437 | { |
438 | int ret; |
439 | struct lttctl_handle *handle; |
440 | |
441 | ret = parse_arguments(argc, argv); |
442 | |
443 | if(ret != 0) show_arguments(); |
444 | if(ret < 0) return EINVAL; |
445 | if(ret > 0) return 0; |
446 | |
447 | show_info(); |
448 | |
449 | handle = lttctl_create_handle(); |
450 | |
451 | if(handle == NULL) return -1; |
452 | |
453 | switch(op) { |
b7f08766 |
454 | case CTL_OP_CREATE_START: |
455 | ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, |
456 | n_subbufs); |
457 | if(!ret) |
458 | ret = lttctl_start(handle, trace_name); |
459 | break; |
5adba60f |
460 | case CTL_OP_CREATE: |
988614ed |
461 | ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, |
462 | n_subbufs); |
24ba6df0 |
463 | break; |
5adba60f |
464 | case CTL_OP_DESTROY: |
465 | ret = lttctl_destroy_trace(handle, trace_name); |
466 | break; |
b7f08766 |
467 | case CTL_OP_STOP_DESTROY: |
468 | ret = lttctl_stop(handle, trace_name); |
469 | if(!ret) |
470 | ret = lttctl_destroy_trace(handle, trace_name); |
471 | break; |
5adba60f |
472 | case CTL_OP_START: |
473 | ret = lttctl_start(handle, trace_name); |
474 | break; |
475 | case CTL_OP_STOP: |
476 | ret = lttctl_stop(handle, trace_name); |
477 | break; |
478 | case CTL_OP_DAEMON: |
479 | ret = lttctl_daemon(handle, trace_name); |
480 | break; |
129fd24a |
481 | case CTL_OP_DESCRIPTION: |
482 | ret = create_eventdefs(); |
483 | break; |
5adba60f |
484 | case CTL_OP_NONE: |
485 | break; |
486 | } |
487 | |
488 | ret |= lttctl_destroy_handle(handle); |
489 | |
490 | return ret; |
491 | } |