3 * Linux Trace Toolkit Control
5 * Small program that controls LTT through libltt.
8 * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
15 #include <libltt/libltt.h>
19 #include <sys/types.h>
27 /* Buffer for file copy : 4k seems optimal. */
28 #define BUF_SIZE 4194304
42 static char *trace_name
= NULL
;
43 static char *mode_name
= NULL
;
44 static unsigned subbuf_size
= 0;
45 static unsigned n_subbufs
= 0;
46 static enum trace_mode mode
= LTT_TRACE_NORMAL
;
47 static enum trace_ctl_op op
= CTL_OP_NONE
;
48 static char *channel_root
= NULL
;
49 static char *trace_root
= NULL
;
51 static int sigchld_received
= 0;
53 void sigchld_handler(int signo
)
55 printf("signal %d received\n", signo
);
63 void show_arguments(void)
65 printf("Please use the following arguments :\n");
67 printf("-n name Name of the trace.\n");
68 printf("-b Create trace channels and start tracing (no daemon).\n");
69 printf("-c Create trace channels.\n");
70 printf("-m mode Normal or flight recorder mode.\n");
71 printf(" Mode values : normal (default) or flight.\n");
72 printf("-r Destroy trace channels.\n");
73 printf("-R Stop tracing and destroy trace channels.\n");
74 printf("-s Start tracing.\n");
75 //printf(" Note : will automatically create a normal trace if "
77 printf("-q Stop tracing.\n");
78 printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
79 printf(" (optionnaly, you can set LTT_DAEMON\n");
80 printf(" and the LTT_FACILITIES env. vars.)\n");
81 printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
82 printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
83 printf("-z Size of the subbuffers (will be rounded to next page size)\n");
84 printf("-x Number of subbuffers\n");
85 printf("-e Get XML facilities description\n");
92 * Parses the command line arguments.
94 * Returns 1 if the arguments were correct, but doesn't ask for program
95 * continuation. Returns -1 if the arguments are incorrect, or 0 if OK.
97 int parse_arguments(int argc
, char **argv
)
103 if(strcmp(argv
[1], "-h") == 0) {
110 switch(argv
[argn
][0]) {
112 switch(argv
[argn
][1]) {
115 trace_name
= argv
[argn
+1];
118 printf("Specify a trace name after -n.\n", argv
[argn
]);
125 op
= CTL_OP_CREATE_START
;
131 mode_name
= argv
[argn
+1];
133 if(strcmp(mode_name
, "normal") == 0)
134 mode
= LTT_TRACE_NORMAL
;
135 else if(strcmp(mode_name
, "flight") == 0)
136 mode
= LTT_TRACE_FLIGHT
;
138 printf("Invalid mode '%s'.\n", argv
[argn
]);
143 printf("Specify a mode after -m.\n");
152 op
= CTL_OP_STOP_DESTROY
;
162 subbuf_size
= (unsigned)atoi(argv
[argn
+1]);
165 printf("Specify a number of subbuffers after -z.\n");
172 n_subbufs
= (unsigned)atoi(argv
[argn
+1]);
175 printf("Specify a subbuffer size after -x.\n");
184 op
= CTL_OP_DESCRIPTION
;
188 trace_root
= argv
[argn
+1];
191 printf("Specify a trace root path after -t.\n");
198 channel_root
= argv
[argn
+1];
201 printf("Specify a channel root path after -l.\n");
207 printf("Invalid argument '%s'.\n", argv
[argn
]);
213 printf("Invalid argument '%s'.\n", argv
[argn
]);
220 if(op
!= CTL_OP_DESCRIPTION
&& trace_name
== NULL
) {
221 printf("Please specify a trace name.\n");
226 if(op
== CTL_OP_NONE
) {
227 printf("Please specify an operation.\n");
232 if(op
== CTL_OP_DAEMON
) {
233 if(trace_root
== NULL
) {
234 printf("Please specify -t trace_root_path with the -d option.\n");
238 if(channel_root
== NULL
) {
239 printf("Please specify -l ltt_root_path with the -d option.\n");
245 if(op
== CTL_OP_DESCRIPTION
) {
246 if(trace_root
== NULL
) {
247 printf("Please specify -t trace_root_path with the -e option.\n");
258 printf("Linux Trace Toolkit Trace Control\n");
260 if(trace_name
!= NULL
) {
261 printf("Controlling trace : %s\n", trace_name
);
266 int create_eventdefs(void)
269 char eventdefs_path
[PATH_MAX
];
270 char eventdefs_file
[PATH_MAX
];
271 char facilities_file
[PATH_MAX
];
272 char read_buf
[BUF_SIZE
];
273 struct dirent
*entry
;
274 char *facilities_path
= getenv("LTT_FACILITIES");
275 if(facilities_path
== NULL
) facilities_path
=
276 PACKAGE_DATA_DIR
"/" PACKAGE
"/facilities";
278 ret
= mkdir(trace_root
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
279 if(ret
== -1 && errno
!= EEXIST
) {
280 perror("Cannot create trace_root directory");
281 printf("trace_root is %s\n", trace_root
);
286 size_t trace_root_len
= strlen(trace_root
);
287 strncpy(eventdefs_path
, trace_root
, PATH_MAX
);
288 strncat(eventdefs_path
, "/eventdefs/", PATH_MAX
- trace_root_len
);
289 size_t eventdefs_path_len
= strlen(eventdefs_path
);
290 ret
= mkdir(eventdefs_path
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
291 if(ret
== -1 && errno
!= EEXIST
) {
292 perror("Cannot create eventdefs directory");
297 DIR *facilities_dir
= opendir(facilities_path
);
299 if(facilities_dir
== NULL
) {
300 perror("Cannot open facilities directory");
305 while((entry
= readdir(facilities_dir
)) != NULL
) {
306 if(entry
->d_name
[0] == '.') continue;
308 printf("Appending facility file %s\n", entry
->d_name
);
309 strncpy(eventdefs_file
, eventdefs_path
, PATH_MAX
);
310 strncat(eventdefs_file
, entry
->d_name
, PATH_MAX
- eventdefs_path_len
);
311 /* Append to the file */
312 FILE *dest
= fopen(eventdefs_file
, "a");
314 perror("Cannot create eventdefs file");
317 strncpy(facilities_file
, facilities_path
, PATH_MAX
);
318 size_t facilities_dir_len
= strlen(facilities_path
);
319 strncat(facilities_file
, "/", PATH_MAX
- facilities_dir_len
);
320 strncat(facilities_file
, entry
->d_name
, PATH_MAX
- facilities_dir_len
-1);
321 FILE *src
= fopen(facilities_file
, "r");
323 perror("Cannot open eventdefs file for reading");
328 size_t read_size
, write_size
;
329 read_size
= fread(read_buf
, sizeof(char), BUF_SIZE
, src
);
331 perror("Cannot read eventdefs file");
334 write_size
= fwrite(read_buf
, sizeof(char), read_size
, dest
);
336 perror("Cannot write eventdefs file");
341 /* Add spacing between facilities */
342 fwrite("\n", 1, 1, dest
);
350 closedir(facilities_dir
);
358 int lttctl_daemon(struct lttctl_handle
*handle
, char *trace_name
)
360 char channel_path
[PATH_MAX
] = "";
363 char *lttd_path
= getenv("LTT_DAEMON");
364 struct sigaction act
;
366 if(lttd_path
== NULL
) lttd_path
=
367 PACKAGE_BIN_DIR
"/lttd";
369 strcat(channel_path
, channel_root
);
370 strcat(channel_path
, "/");
371 strcat(channel_path
, trace_name
);
374 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
, n_subbufs
);
375 if(ret
!= 0) goto create_error
;
377 act
.sa_handler
= sigchld_handler
;
378 sigemptyset(&(act
.sa_mask
));
379 sigaddset(&(act
.sa_mask
), SIGCHLD
);
380 sigaction(SIGCHLD
, &act
, NULL
);
387 while(!(sigchld_received
)) pause();
389 waitpid(pid
, &status
, 0);
391 if(WIFEXITED(status
))
392 ret
= WEXITSTATUS(status
);
393 if(ret
) goto start_error
;
395 printf("Creating supplementary trace files\n");
396 ret
= create_eventdefs();
397 if(ret
) goto start_error
;
399 } else if(pid
== 0) {
402 int ret
= execlp(lttd_path
, lttd_path
, "-t", trace_root
, "-c",
403 channel_path
, "-d", NULL
);
405 perror("Error in executing the lttd daemon");
410 perror("Error in forking for lttd daemon");
414 ret
= lttctl_start(handle
, trace_name
);
415 if(ret
!= 0) goto start_error
;
421 printf("Trace start error\n");
422 ret
|= lttctl_destroy_trace(handle
, trace_name
);
427 int main(int argc
, char ** argv
)
430 struct lttctl_handle
*handle
;
432 ret
= parse_arguments(argc
, argv
);
434 if(ret
!= 0) show_arguments();
435 if(ret
< 0) return EINVAL
;
436 if(ret
> 0) return 0;
440 handle
= lttctl_create_handle();
442 if(handle
== NULL
) return -1;
445 case CTL_OP_CREATE_START
:
446 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
,
449 ret
= lttctl_start(handle
, trace_name
);
452 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
,
456 ret
= lttctl_destroy_trace(handle
, trace_name
);
458 case CTL_OP_STOP_DESTROY
:
459 ret
= lttctl_stop(handle
, trace_name
);
461 ret
= lttctl_destroy_trace(handle
, trace_name
);
464 ret
= lttctl_start(handle
, trace_name
);
467 ret
= lttctl_stop(handle
, trace_name
);
470 ret
= lttctl_daemon(handle
, trace_name
);
472 case CTL_OP_DESCRIPTION
:
473 ret
= create_eventdefs();
479 ret
|= lttctl_destroy_handle(handle
);
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