3 * Linux Trace Toolkit Control
5 * Small program that controls LTT through libltt.
8 * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
15 #include <liblttctl/lttctl.h>
19 #include <sys/types.h>
27 /* Buffer for file copy : 4k seems optimal. */
42 static char *trace_name
= NULL
;
43 static char *trace_type
= "relay";
44 static char *mode_name
= NULL
;
45 static unsigned subbuf_size
= 0;
46 static unsigned n_subbufs
= 0;
47 static unsigned append_trace
= 0;
48 static enum trace_mode mode
= LTT_TRACE_NORMAL
;
49 static enum trace_ctl_op op
= CTL_OP_NONE
;
50 static char *channel_root
= NULL
;
51 static char *trace_root
= NULL
;
52 static char *num_threads
= "1";
57 void show_arguments(void)
59 printf("Please use the following arguments :\n");
61 printf("-n name Name of the trace.\n");
62 printf("-b Create trace channels and start tracing (no daemon).\n");
63 printf("-c Create trace channels.\n");
64 printf("-m mode Normal or flight recorder mode.\n");
65 printf(" Mode values : normal (default) or flight.\n");
66 printf("-r Destroy trace channels.\n");
67 printf("-R Stop tracing and destroy trace channels.\n");
68 printf("-s Start tracing.\n");
69 //printf(" Note : will automatically create a normal trace if "
71 printf("-q Stop tracing.\n");
72 printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
73 printf(" (optionnaly, you can set LTT_DAEMON\n");
74 printf(" and the LTT_FACILITIES env. vars.)\n");
75 printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
76 printf("-T Type of trace (ex. relay)\n");
77 printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
78 printf("-z Size of the subbuffers (will be rounded to next page size)\n");
79 printf("-x Number of subbuffers\n");
80 printf("-e Get XML facilities description\n");
81 printf("-a Append to trace\n");
82 printf("-N Number of lttd threads\n");
89 * Parses the command line arguments.
91 * Returns -1 if the arguments were correct, but doesn't ask for program
92 * continuation. Returns EINVAL if the arguments are incorrect, or 0 if OK.
94 int parse_arguments(int argc
, char **argv
)
100 if(strcmp(argv
[1], "-h") == 0) {
107 switch(argv
[argn
][0]) {
109 switch(argv
[argn
][1]) {
112 trace_name
= argv
[argn
+1];
115 printf("Specify a trace name after -n.\n");
122 op
= CTL_OP_CREATE_START
;
129 mode_name
= argv
[argn
+1];
131 if(strcmp(mode_name
, "normal") == 0)
132 mode
= LTT_TRACE_NORMAL
;
133 else if(strcmp(mode_name
, "flight") == 0)
134 mode
= LTT_TRACE_FLIGHT
;
136 printf("Invalid mode '%s'.\n", argv
[argn
]);
141 printf("Specify a mode after -m.\n");
150 op
= CTL_OP_STOP_DESTROY
;
160 subbuf_size
= (unsigned)atoi(argv
[argn
+1]);
163 printf("Specify a number of subbuffers after -z.\n");
170 n_subbufs
= (unsigned)atoi(argv
[argn
+1]);
173 printf("Specify a subbuffer size after -x.\n");
182 op
= CTL_OP_DESCRIPTION
;
186 trace_root
= argv
[argn
+1];
189 printf("Specify a trace root path after -t.\n");
196 channel_root
= argv
[argn
+1];
199 printf("Specify a channel root path after -l.\n");
209 num_threads
= argv
[argn
+1];
215 trace_type
= argv
[argn
+1];
218 printf("Specify a trace type after -T.\n");
224 printf("Invalid argument '%s'.\n", argv
[argn
]);
230 printf("Invalid argument '%s'.\n", argv
[argn
]);
237 if(op
!= CTL_OP_DESCRIPTION
&& trace_name
== NULL
) {
238 printf("Please specify a trace name.\n");
243 if(op
== CTL_OP_NONE
) {
244 printf("Please specify an operation.\n");
249 if(op
== CTL_OP_DAEMON
) {
250 if(trace_root
== NULL
) {
251 printf("Please specify -t trace_root_path with the -d option.\n");
255 if(channel_root
== NULL
) {
256 printf("Please specify -l ltt_root_path with the -d option.\n");
262 if(op
== CTL_OP_DESCRIPTION
) {
263 if(trace_root
== NULL
) {
264 printf("Please specify -t trace_root_path with the -e option.\n");
275 printf("Linux Trace Toolkit Trace Control\n");
277 if(trace_name
!= NULL
) {
278 printf("Controlling trace : %s\n", trace_name
);
283 int create_eventdefs(void)
286 char eventdefs_path
[PATH_MAX
];
287 char eventdefs_file
[PATH_MAX
];
288 char facilities_file
[PATH_MAX
];
289 char read_buf
[BUF_SIZE
];
290 struct dirent
*entry
;
291 char *facilities_path
= getenv("LTT_FACILITIES");
292 if(facilities_path
== NULL
) facilities_path
=
293 PACKAGE_DATA_DIR
"/" PACKAGE
"/facilities";
295 ret
= mkdir(trace_root
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
296 if(ret
== -1 && errno
!= EEXIST
) {
298 perror("Cannot create trace_root directory");
299 printf("trace_root is %s\n", trace_root
);
304 size_t trace_root_len
= strlen(trace_root
);
305 strncpy(eventdefs_path
, trace_root
, PATH_MAX
);
306 strncat(eventdefs_path
, "/eventdefs/", PATH_MAX
- trace_root_len
);
307 size_t eventdefs_path_len
= strlen(eventdefs_path
);
308 ret
= mkdir(eventdefs_path
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
309 if(ret
== -1 && (!append_trace
|| errno
!= EEXIST
)) {
311 perror("Cannot create eventdefs directory");
316 DIR *facilities_dir
= opendir(facilities_path
);
318 if(facilities_dir
== NULL
) {
319 perror("Cannot open facilities directory");
324 while((entry
= readdir(facilities_dir
)) != NULL
) {
325 if(entry
->d_name
[0] == '.') continue;
327 printf("Appending facility file %s\n", entry
->d_name
);
328 strncpy(eventdefs_file
, eventdefs_path
, PATH_MAX
);
329 strncat(eventdefs_file
, entry
->d_name
, PATH_MAX
- eventdefs_path_len
);
330 /* Append to the file */
331 FILE *dest
= fopen(eventdefs_file
, "a");
333 perror("Cannot create eventdefs file");
336 strncpy(facilities_file
, facilities_path
, PATH_MAX
);
337 size_t facilities_dir_len
= strlen(facilities_path
);
338 strncat(facilities_file
, "/", PATH_MAX
- facilities_dir_len
);
339 strncat(facilities_file
, entry
->d_name
, PATH_MAX
- facilities_dir_len
-1);
340 FILE *src
= fopen(facilities_file
, "r");
343 perror("Cannot open eventdefs file for reading");
348 size_t read_size
, write_size
;
349 read_size
= fread(read_buf
, sizeof(char), BUF_SIZE
, src
);
352 perror("Cannot read eventdefs file");
355 write_size
= fwrite(read_buf
, sizeof(char), read_size
, dest
);
358 perror("Cannot write eventdefs file");
363 /* Add spacing between facilities */
364 fwrite("\n", 1, 1, dest
);
372 closedir(facilities_dir
);
380 int lttctl_daemon(struct lttctl_handle
*handle
, char *trace_name
)
382 char channel_path
[PATH_MAX
] = "";
385 char *lttd_path
= getenv("LTT_DAEMON");
387 if(lttd_path
== NULL
) lttd_path
=
388 PACKAGE_BIN_DIR
"/lttd";
390 strcat(channel_path
, channel_root
);
391 strcat(channel_path
, "/");
392 strcat(channel_path
, trace_name
);
395 ret
= lttctl_create_trace(handle
, trace_name
, mode
, trace_type
, subbuf_size
, n_subbufs
);
396 if(ret
!= 0) goto create_error
;
404 ret
= waitpid(pid
, &status
, 0);
407 perror("Error in waitpid");
412 if(WIFEXITED(status
))
413 ret
= WEXITSTATUS(status
);
414 if(ret
) goto start_error
;
416 printf("Creating supplementary trace files\n");
417 ret
= create_eventdefs();
418 if(ret
) goto start_error
;
420 } else if(pid
== 0) {
424 ret
= execlp(lttd_path
, lttd_path
, "-t", trace_root
, "-c",
425 channel_path
, "-d", "-a", "-N", num_threads
, NULL
);
427 ret
= execlp(lttd_path
, lttd_path
, "-t", trace_root
, "-c",
428 channel_path
, "-d", "-N", num_threads
, NULL
);
431 perror("Error in executing the lttd daemon");
436 perror("Error in forking for lttd daemon");
439 ret
= lttctl_start(handle
, trace_name
);
440 if(ret
!= 0) goto start_error
;
446 printf("Trace start error\n");
447 ret
|= lttctl_destroy_trace(handle
, trace_name
);
452 int main(int argc
, char ** argv
)
455 struct lttctl_handle
*handle
;
457 ret
= parse_arguments(argc
, argv
);
459 if(ret
!= 0) show_arguments();
460 if(ret
== EINVAL
) return EINVAL
;
461 if(ret
== -1) return 0;
465 handle
= lttctl_create_handle();
467 if(handle
== NULL
) return -1;
470 case CTL_OP_CREATE_START
:
471 ret
= lttctl_create_trace(handle
, trace_name
, mode
, trace_type
, subbuf_size
,
474 ret
= lttctl_start(handle
, trace_name
);
477 ret
= lttctl_create_trace(handle
, trace_name
, mode
, trace_type
, subbuf_size
,
481 ret
= lttctl_destroy_trace(handle
, trace_name
);
483 case CTL_OP_STOP_DESTROY
:
484 ret
= lttctl_stop(handle
, trace_name
);
486 ret
= lttctl_destroy_trace(handle
, trace_name
);
489 ret
= lttctl_start(handle
, trace_name
);
492 ret
= lttctl_stop(handle
, trace_name
);
495 ret
= lttctl_daemon(handle
, trace_name
);
497 case CTL_OP_DESCRIPTION
:
498 ret
= create_eventdefs();
504 ret
|= lttctl_destroy_handle(handle
);
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