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 *mode_name
= NULL
;
44 static unsigned subbuf_size
= 0;
45 static unsigned n_subbufs
= 0;
46 static unsigned append_trace
= 0;
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 static char *num_threads
= "1";
53 static int sigchld_received
= 0;
55 void sigchld_handler(int signo
)
57 printf("signal %d received\n", signo
);
65 void show_arguments(void)
67 printf("Please use the following arguments :\n");
69 printf("-n name Name of the trace.\n");
70 printf("-b Create trace channels and start tracing (no daemon).\n");
71 printf("-c Create trace channels.\n");
72 printf("-m mode Normal or flight recorder mode.\n");
73 printf(" Mode values : normal (default) or flight.\n");
74 printf("-r Destroy trace channels.\n");
75 printf("-R Stop tracing and destroy trace channels.\n");
76 printf("-s Start tracing.\n");
77 //printf(" Note : will automatically create a normal trace if "
79 printf("-q Stop tracing.\n");
80 printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
81 printf(" (optionnaly, you can set LTT_DAEMON\n");
82 printf(" and the LTT_FACILITIES env. vars.)\n");
83 printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
84 printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
85 printf("-z Size of the subbuffers (will be rounded to next page size)\n");
86 printf("-x Number of subbuffers\n");
87 printf("-e Get XML facilities description\n");
88 printf("-a Append to trace\n");
89 printf("-N Number of lttd threads\n");
96 * Parses the command line arguments.
98 * Returns -1 if the arguments were correct, but doesn't ask for program
99 * continuation. Returns EINVAL if the arguments are incorrect, or 0 if OK.
101 int parse_arguments(int argc
, char **argv
)
107 if(strcmp(argv
[1], "-h") == 0) {
114 switch(argv
[argn
][0]) {
116 switch(argv
[argn
][1]) {
119 trace_name
= argv
[argn
+1];
122 printf("Specify a trace name after -n.\n");
129 op
= CTL_OP_CREATE_START
;
136 mode_name
= argv
[argn
+1];
138 if(strcmp(mode_name
, "normal") == 0)
139 mode
= LTT_TRACE_NORMAL
;
140 else if(strcmp(mode_name
, "flight") == 0)
141 mode
= LTT_TRACE_FLIGHT
;
143 printf("Invalid mode '%s'.\n", argv
[argn
]);
148 printf("Specify a mode after -m.\n");
157 op
= CTL_OP_STOP_DESTROY
;
167 subbuf_size
= (unsigned)atoi(argv
[argn
+1]);
170 printf("Specify a number of subbuffers after -z.\n");
177 n_subbufs
= (unsigned)atoi(argv
[argn
+1]);
180 printf("Specify a subbuffer size after -x.\n");
189 op
= CTL_OP_DESCRIPTION
;
193 trace_root
= argv
[argn
+1];
196 printf("Specify a trace root path after -t.\n");
203 channel_root
= argv
[argn
+1];
206 printf("Specify a channel root path after -l.\n");
216 num_threads
= argv
[argn
+1];
221 printf("Invalid argument '%s'.\n", argv
[argn
]);
227 printf("Invalid argument '%s'.\n", argv
[argn
]);
234 if(op
!= CTL_OP_DESCRIPTION
&& trace_name
== NULL
) {
235 printf("Please specify a trace name.\n");
240 if(op
== CTL_OP_NONE
) {
241 printf("Please specify an operation.\n");
246 if(op
== CTL_OP_DAEMON
) {
247 if(trace_root
== NULL
) {
248 printf("Please specify -t trace_root_path with the -d option.\n");
252 if(channel_root
== NULL
) {
253 printf("Please specify -l ltt_root_path with the -d option.\n");
259 if(op
== CTL_OP_DESCRIPTION
) {
260 if(trace_root
== NULL
) {
261 printf("Please specify -t trace_root_path with the -e option.\n");
272 printf("Linux Trace Toolkit Trace Control\n");
274 if(trace_name
!= NULL
) {
275 printf("Controlling trace : %s\n", trace_name
);
280 int create_eventdefs(void)
283 char eventdefs_path
[PATH_MAX
];
284 char eventdefs_file
[PATH_MAX
];
285 char facilities_file
[PATH_MAX
];
286 char read_buf
[BUF_SIZE
];
287 struct dirent
*entry
;
288 char *facilities_path
= getenv("LTT_FACILITIES");
289 if(facilities_path
== NULL
) facilities_path
=
290 PACKAGE_DATA_DIR
"/" PACKAGE
"/facilities";
292 ret
= mkdir(trace_root
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
293 if(ret
== -1 && errno
!= EEXIST
) {
295 perror("Cannot create trace_root directory");
296 printf("trace_root is %s\n", trace_root
);
301 size_t trace_root_len
= strlen(trace_root
);
302 strncpy(eventdefs_path
, trace_root
, PATH_MAX
);
303 strncat(eventdefs_path
, "/eventdefs/", PATH_MAX
- trace_root_len
);
304 size_t eventdefs_path_len
= strlen(eventdefs_path
);
305 ret
= mkdir(eventdefs_path
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
306 if(ret
== -1 && (!append_trace
|| errno
!= EEXIST
)) {
308 perror("Cannot create eventdefs directory");
313 DIR *facilities_dir
= opendir(facilities_path
);
315 if(facilities_dir
== NULL
) {
316 perror("Cannot open facilities directory");
321 while((entry
= readdir(facilities_dir
)) != NULL
) {
322 if(entry
->d_name
[0] == '.') continue;
324 printf("Appending facility file %s\n", entry
->d_name
);
325 strncpy(eventdefs_file
, eventdefs_path
, PATH_MAX
);
326 strncat(eventdefs_file
, entry
->d_name
, PATH_MAX
- eventdefs_path_len
);
327 /* Append to the file */
328 FILE *dest
= fopen(eventdefs_file
, "a");
330 perror("Cannot create eventdefs file");
333 strncpy(facilities_file
, facilities_path
, PATH_MAX
);
334 size_t facilities_dir_len
= strlen(facilities_path
);
335 strncat(facilities_file
, "/", PATH_MAX
- facilities_dir_len
);
336 strncat(facilities_file
, entry
->d_name
, PATH_MAX
- facilities_dir_len
-1);
337 FILE *src
= fopen(facilities_file
, "r");
340 perror("Cannot open eventdefs file for reading");
345 size_t read_size
, write_size
;
346 read_size
= fread(read_buf
, sizeof(char), BUF_SIZE
, src
);
349 perror("Cannot read eventdefs file");
352 write_size
= fwrite(read_buf
, sizeof(char), read_size
, dest
);
355 perror("Cannot write eventdefs file");
360 /* Add spacing between facilities */
361 fwrite("\n", 1, 1, dest
);
369 closedir(facilities_dir
);
377 int lttctl_daemon(struct lttctl_handle
*handle
, char *trace_name
)
379 char channel_path
[PATH_MAX
] = "";
382 char *lttd_path
= getenv("LTT_DAEMON");
383 struct sigaction act
;
385 if(lttd_path
== NULL
) lttd_path
=
386 PACKAGE_BIN_DIR
"/lttd";
388 strcat(channel_path
, channel_root
);
389 strcat(channel_path
, "/");
390 strcat(channel_path
, trace_name
);
393 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
, n_subbufs
);
394 if(ret
!= 0) goto create_error
;
396 act
.sa_handler
= sigchld_handler
;
397 sigemptyset(&(act
.sa_mask
));
398 sigaddset(&(act
.sa_mask
), SIGCHLD
);
399 sigaction(SIGCHLD
, &act
, NULL
);
406 while(!(sigchld_received
)) pause();
408 waitpid(pid
, &status
, 0);
410 if(WIFEXITED(status
))
411 ret
= WEXITSTATUS(status
);
412 if(ret
) goto start_error
;
414 printf("Creating supplementary trace files\n");
415 ret
= create_eventdefs();
416 if(ret
) goto start_error
;
418 } else if(pid
== 0) {
422 ret
= execlp(lttd_path
, lttd_path
, "-t", trace_root
, "-c",
423 channel_path
, "-d", "-a", "-N", num_threads
, NULL
);
425 ret
= execlp(lttd_path
, lttd_path
, "-t", trace_root
, "-c",
426 channel_path
, "-d", "-N", num_threads
, NULL
);
429 perror("Error in executing the lttd daemon");
434 perror("Error in forking for lttd daemon");
437 ret
= lttctl_start(handle
, trace_name
);
438 if(ret
!= 0) goto start_error
;
444 printf("Trace start error\n");
445 ret
|= lttctl_destroy_trace(handle
, trace_name
);
450 int main(int argc
, char ** argv
)
453 struct lttctl_handle
*handle
;
455 ret
= parse_arguments(argc
, argv
);
457 if(ret
!= 0) show_arguments();
458 if(ret
== EINVAL
) return EINVAL
;
459 if(ret
== -1) return 0;
463 handle
= lttctl_create_handle();
465 if(handle
== NULL
) return -1;
468 case CTL_OP_CREATE_START
:
469 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
,
472 ret
= lttctl_start(handle
, trace_name
);
475 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
,
479 ret
= lttctl_destroy_trace(handle
, trace_name
);
481 case CTL_OP_STOP_DESTROY
:
482 ret
= lttctl_stop(handle
, trace_name
);
484 ret
= lttctl_destroy_trace(handle
, trace_name
);
487 ret
= lttctl_start(handle
, trace_name
);
490 ret
= lttctl_stop(handle
, trace_name
);
493 ret
= lttctl_daemon(handle
, trace_name
);
495 case CTL_OP_DESCRIPTION
:
496 ret
= create_eventdefs();
502 ret
|= lttctl_destroy_handle(handle
);
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