fe4be9b1f77c4424f7880f56ed93a5c8e276b453
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>
26 /* Buffer for file copy : 4k seems optimal. */
27 #define BUF_SIZE 4194304
41 static char *trace_name
= NULL
;
42 static char *mode_name
= NULL
;
43 static unsigned subbuf_size
= 0;
44 static unsigned n_subbufs
= 0;
45 static enum trace_mode mode
= LTT_TRACE_NORMAL
;
46 static enum trace_ctl_op op
= CTL_OP_NONE
;
47 static char *channel_root
= NULL
;
48 static char *trace_root
= NULL
;
50 static int sigio_received
= 0;
52 void handler(int signo
)
54 printf("signal %d received\n", signo
);
62 void show_arguments(void)
64 printf("Please use the following arguments :\n");
66 printf("-n name Name of the trace.\n");
67 printf("-b Create trace channels and start tracing (no daemon).\n");
68 printf("-c Create trace channels.\n");
69 printf("-m mode Normal or flight recorder mode.\n");
70 printf(" Mode values : normal (default) or flight.\n");
71 printf("-r Destroy trace channels.\n");
72 printf("-R Stop tracing and destroy trace channels.\n");
73 printf("-s Start tracing.\n");
74 //printf(" Note : will automatically create a normal trace if "
76 printf("-q Stop tracing.\n");
77 printf("-d Create trace, spawn a lttd daemon, start tracing.\n");
78 printf(" (optionnaly, you can set LTT_DAEMON\n");
79 printf(" and the LTT_FACILITIES env. vars.)\n");
80 printf("-t Trace root path. (ex. /root/traces/example_trace)\n");
81 printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n");
82 printf("-z Size of the subbuffers (will be rounded to next page size)\n");
83 printf("-x Number of subbuffers\n");
84 printf("-e Get XML facilities description\n");
91 * Parses the command line arguments.
93 * Returns 1 if the arguments were correct, but doesn't ask for program
94 * continuation. Returns -1 if the arguments are incorrect, or 0 if OK.
96 int parse_arguments(int argc
, char **argv
)
102 if(strcmp(argv
[1], "-h") == 0) {
109 switch(argv
[argn
][0]) {
111 switch(argv
[argn
][1]) {
114 trace_name
= argv
[argn
+1];
117 printf("Specify a trace name after -n.\n", argv
[argn
]);
124 op
= CTL_OP_CREATE_START
;
130 mode_name
= argv
[argn
+1];
132 if(strcmp(mode_name
, "normal") == 0)
133 mode
= LTT_TRACE_NORMAL
;
134 else if(strcmp(mode_name
, "flight") == 0)
135 mode
= LTT_TRACE_FLIGHT
;
137 printf("Invalid mode '%s'.\n", argv
[argn
]);
142 printf("Specify a mode after -m.\n");
151 op
= CTL_OP_STOP_DESTROY
;
161 subbuf_size
= (unsigned)atoi(argv
[argn
+1]);
164 printf("Specify a number of subbuffers after -z.\n");
171 n_subbufs
= (unsigned)atoi(argv
[argn
+1]);
174 printf("Specify a subbuffer size after -x.\n");
183 op
= CTL_OP_DESCRIPTION
;
187 trace_root
= argv
[argn
+1];
190 printf("Specify a trace root path after -t.\n");
197 channel_root
= argv
[argn
+1];
200 printf("Specify a channel root path after -l.\n");
206 printf("Invalid argument '%s'.\n", argv
[argn
]);
212 printf("Invalid argument '%s'.\n", argv
[argn
]);
219 if(op
!= CTL_OP_DESCRIPTION
&& trace_name
== NULL
) {
220 printf("Please specify a trace name.\n");
225 if(op
== CTL_OP_NONE
) {
226 printf("Please specify an operation.\n");
231 if(op
== CTL_OP_DAEMON
) {
232 if(trace_root
== NULL
) {
233 printf("Please specify -t trace_root_path with the -d option.\n");
237 if(channel_root
== NULL
) {
238 printf("Please specify -l ltt_root_path with the -d option.\n");
244 if(op
== CTL_OP_DESCRIPTION
) {
245 if(trace_root
== NULL
) {
246 printf("Please specify -t trace_root_path with the -e option.\n");
257 printf("Linux Trace Toolkit Trace Control\n");
259 if(trace_name
!= NULL
) {
260 printf("Controlling trace : %s\n", trace_name
);
265 int create_eventdefs(void)
268 char eventdefs_path
[PATH_MAX
];
269 char eventdefs_file
[PATH_MAX
];
270 char facilities_file
[PATH_MAX
];
271 char read_buf
[BUF_SIZE
];
272 struct dirent
*entry
;
273 char *facilities_path
= getenv("LTT_FACILITIES");
274 if(facilities_path
== NULL
) facilities_path
=
275 "/usr/share/LinuxTraceToolkitViewer/facilities";
277 ret
= mkdir(trace_root
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
278 if(ret
== -1 && errno
!= EEXIST
) {
279 perror("Cannot create trace_root directory");
280 printf("trace_root is %s\n", trace_root
);
285 size_t trace_root_len
= strlen(trace_root
);
286 strncpy(eventdefs_path
, trace_root
, PATH_MAX
);
287 strncat(eventdefs_path
, "/eventdefs/", PATH_MAX
- trace_root_len
);
288 size_t eventdefs_path_len
= strlen(eventdefs_path
);
289 ret
= mkdir(eventdefs_path
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
290 if(ret
== -1 && errno
!= EEXIST
) {
291 perror("Cannot create eventdefs directory");
296 DIR *facilities_dir
= opendir(facilities_path
);
298 while((entry
= readdir(facilities_dir
)) != NULL
) {
299 if(entry
->d_name
[0] == '.') continue;
301 printf("Appending facility file %s\n", entry
->d_name
);
302 strncpy(eventdefs_file
, eventdefs_path
, PATH_MAX
);
303 strncat(eventdefs_file
, entry
->d_name
, PATH_MAX
- eventdefs_path_len
);
304 /* Append to the file */
305 FILE *dest
= fopen(eventdefs_file
, "a");
307 perror("Cannot create eventdefs file");
310 strncpy(facilities_file
, facilities_path
, PATH_MAX
);
311 size_t facilities_dir_len
= strlen(facilities_path
);
312 strncat(facilities_file
, "/", PATH_MAX
- facilities_dir_len
);
313 strncat(facilities_file
, entry
->d_name
, PATH_MAX
- facilities_dir_len
-1);
314 FILE *src
= fopen(facilities_file
, "r");
316 perror("Cannot open eventdefs file for reading");
321 size_t read_size
, write_size
;
322 read_size
= fread(read_buf
, sizeof(char), BUF_SIZE
, src
);
324 perror("Cannot read eventdefs file");
327 write_size
= fwrite(read_buf
, sizeof(char), read_size
, dest
);
329 perror("Cannot write eventdefs file");
334 /* Add spacing between facilities */
335 fwrite("\n", 1, 1, dest
);
343 closedir(facilities_dir
);
351 int lttctl_daemon(struct lttctl_handle
*handle
, char *trace_name
)
353 char channel_path
[PATH_MAX
] = "";
356 char *lttd_path
= getenv("LTT_DAEMON");
357 struct sigaction act
;
359 if(lttd_path
== NULL
) lttd_path
= "lttd";
361 strcat(channel_path
, channel_root
);
362 strcat(channel_path
, "/");
363 strcat(channel_path
, trace_name
);
366 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
, n_subbufs
);
367 if(ret
!= 0) goto create_error
;
369 act
.sa_handler
= handler
;
370 sigemptyset(&(act
.sa_mask
));
371 sigaddset(&(act
.sa_mask
), SIGIO
);
372 sigaction(SIGIO
, &act
, NULL
);
380 while(!sigio_received
) pause();
382 /* Now the trace is created, go on and create the supplementary files... */
384 printf("Creating supplementary trace files\n");
385 ret
= create_eventdefs();
386 if(ret
) goto start_error
;
388 } else if(pid
== 0) {
391 execlp(lttd_path
, lttd_path
, "-t", trace_root
, "-c", channel_path
, "-s", NULL
);
393 perror("Error in executing the lttd daemon");
398 perror("Error in forking for lttd daemon");
402 ret
= lttctl_start(handle
, trace_name
);
403 if(ret
!= 0) goto start_error
;
409 ret
|= lttctl_destroy_trace(handle
, trace_name
);
414 int main(int argc
, char ** argv
)
417 struct lttctl_handle
*handle
;
419 ret
= parse_arguments(argc
, argv
);
421 if(ret
!= 0) show_arguments();
422 if(ret
< 0) return EINVAL
;
423 if(ret
> 0) return 0;
427 handle
= lttctl_create_handle();
429 if(handle
== NULL
) return -1;
432 case CTL_OP_CREATE_START
:
433 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
,
436 ret
= lttctl_start(handle
, trace_name
);
439 ret
= lttctl_create_trace(handle
, trace_name
, mode
, subbuf_size
,
443 ret
= lttctl_destroy_trace(handle
, trace_name
);
445 case CTL_OP_STOP_DESTROY
:
446 ret
= lttctl_stop(handle
, trace_name
);
448 ret
= lttctl_destroy_trace(handle
, trace_name
);
451 ret
= lttctl_start(handle
, trace_name
);
454 ret
= lttctl_stop(handle
, trace_name
);
457 ret
= lttctl_daemon(handle
, trace_name
);
459 case CTL_OP_DESCRIPTION
:
460 ret
= create_eventdefs();
466 ret
|= lttctl_destroy_handle(handle
);
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