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> |
20 | #include <unistd.h> |
21 | #include <signal.h> |
2cdb6fcb |
22 | |
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23 | enum trace_ctl_op { |
24 | CTL_OP_CREATE, |
25 | CTL_OP_DESTROY, |
26 | CTL_OP_START, |
27 | CTL_OP_STOP, |
28 | CTL_OP_DAEMON, |
988614ed |
29 | CTL_OP_ALIGN, |
5adba60f |
30 | CTL_OP_NONE |
31 | }; |
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32 | |
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33 | static char *trace_name = NULL; |
34 | static char *mode_name = NULL; |
988614ed |
35 | static unsigned subbuf_size = 0; |
36 | static unsigned n_subbufs = 0; |
5adba60f |
37 | static enum trace_mode mode = LTT_TRACE_NORMAL; |
38 | static enum trace_ctl_op op = CTL_OP_NONE; |
39 | static char *channel_root = NULL; |
40 | static char *trace_root = NULL; |
988614ed |
41 | static unsigned alignment = 0; |
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42 | |
ada84671 |
43 | static int sigio_received = 0; |
44 | |
5adba60f |
45 | void handler(int signo) |
46 | { |
47 | printf("signal %d received\n", signo); |
ada84671 |
48 | sigio_received = 1; |
5adba60f |
49 | } |
50 | |
51 | |
52 | /* Args : |
53 | * |
54 | */ |
55 | void show_arguments(void) |
56 | { |
57 | printf("Please use the following arguments :\n"); |
58 | printf("\n"); |
59 | printf("-n name Name of the trace.\n"); |
60 | printf("-c mode Create trace channels in mode normal or flight recorder.\n"); |
61 | printf(" Mode values : normal (default) or flight.\n"); |
62 | printf("-r Destroy trace channels.\n"); |
63 | printf("-s Start tracing.\n"); |
64 | //printf(" Note : will automatically create a normal trace if " |
65 | // "none exists.\n"); |
66 | printf("-q Stop tracing.\n"); |
67 | printf("-d Create trace, spawn a lttd daemon, start tracing.\n"); |
68 | printf(" (optionnaly, you can set LTT_DAEMON env. var.)\n"); |
69 | printf("-t Trace root path. (ex. /root/traces/example_trace)\n"); |
70 | printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n"); |
988614ed |
71 | printf("-a Alignment of a new or existing trace\n"); |
4085af66 |
72 | printf("-z Size of the subbuffers (will be rounded to next page size)\n"); |
988614ed |
73 | printf("-x Number of subbuffers\n"); |
5adba60f |
74 | printf("\n"); |
75 | } |
76 | |
77 | |
78 | /* parse_arguments |
79 | * |
80 | * Parses the command line arguments. |
81 | * |
82 | * Returns 1 if the arguments were correct, but doesn't ask for program |
83 | * continuation. Returns -1 if the arguments are incorrect, or 0 if OK. |
84 | */ |
85 | int parse_arguments(int argc, char **argv) |
86 | { |
87 | int ret = 0; |
88 | int argn = 1; |
89 | |
90 | if(argc == 2) { |
91 | if(strcmp(argv[1], "-h") == 0) { |
92 | return 1; |
93 | } |
94 | } |
95 | |
96 | while(argn < argc) { |
97 | |
98 | switch(argv[argn][0]) { |
99 | case '-': |
100 | switch(argv[argn][1]) { |
101 | case 'n': |
102 | if(argn+1 < argc) { |
103 | trace_name = argv[argn+1]; |
104 | argn++; |
105 | } else { |
106 | printf("Specify a trace name after -n.\n", argv[argn]); |
107 | printf("\n"); |
108 | ret = -1; |
109 | } |
110 | |
111 | break; |
112 | case 'c': |
113 | op = CTL_OP_CREATE; |
114 | if(argn+1 < argc) { |
115 | mode_name = argv[argn+1]; |
116 | argn++; |
117 | if(strcmp(mode_name, "normal") == 0) |
118 | mode = LTT_TRACE_NORMAL; |
119 | else if(strcmp(mode_name, "flight") == 0) |
120 | mode = LTT_TRACE_FLIGHT; |
121 | else { |
122 | printf("Invalid mode '%s'.\n", argv[argn]); |
123 | printf("\n"); |
124 | ret = -1; |
125 | } |
126 | } else { |
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127 | printf("Specify a mode after -c.\n"); |
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128 | printf("\n"); |
129 | ret = -1; |
130 | } |
131 | break; |
132 | case 'r': |
133 | op = CTL_OP_DESTROY; |
134 | break; |
135 | case 's': |
136 | op = CTL_OP_START; |
137 | break; |
138 | case 'q': |
139 | op = CTL_OP_STOP; |
140 | break; |
988614ed |
141 | case 'a': |
142 | if(op == CTL_OP_NONE) op = CTL_OP_ALIGN; |
143 | if(argn+1 < argc) { |
144 | alignment = (unsigned)atoi(argv[argn+1]); |
145 | argn++; |
146 | } else { |
147 | printf("Specify an alignment after -a.\n"); |
148 | printf("\n"); |
149 | ret = -1; |
150 | } |
151 | break; |
152 | case 'z': |
153 | if(argn+1 < argc) { |
154 | subbuf_size = (unsigned)atoi(argv[argn+1]); |
155 | argn++; |
156 | } else { |
157 | printf("Specify a number of subbuffers after -z.\n"); |
158 | printf("\n"); |
159 | ret = -1; |
160 | } |
161 | break; |
162 | case 'x': |
163 | if(argn+1 < argc) { |
164 | n_subbufs = (unsigned)atoi(argv[argn+1]); |
165 | argn++; |
166 | } else { |
167 | printf("Specify a subbuffer size after -x.\n"); |
168 | printf("\n"); |
169 | ret = -1; |
170 | } |
171 | break; |
5adba60f |
172 | case 'd': |
173 | op = CTL_OP_DAEMON; |
174 | break; |
175 | case 't': |
176 | if(argn+1 < argc) { |
177 | trace_root = argv[argn+1]; |
178 | argn++; |
179 | } else { |
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180 | printf("Specify a trace root path after -t.\n"); |
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181 | printf("\n"); |
182 | ret = -1; |
183 | } |
184 | break; |
185 | case 'l': |
186 | if(argn+1 < argc) { |
187 | channel_root = argv[argn+1]; |
188 | argn++; |
189 | } else { |
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190 | printf("Specify a channel root path after -l.\n"); |
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191 | printf("\n"); |
192 | ret = -1; |
193 | } |
194 | break; |
195 | default: |
196 | printf("Invalid argument '%s'.\n", argv[argn]); |
197 | printf("\n"); |
198 | ret = -1; |
199 | } |
200 | break; |
201 | default: |
202 | printf("Invalid argument '%s'.\n", argv[argn]); |
203 | printf("\n"); |
204 | ret = -1; |
205 | } |
206 | argn++; |
207 | } |
208 | |
209 | if(trace_name == NULL) { |
210 | printf("Please specify a trace name.\n"); |
211 | printf("\n"); |
212 | ret = -1; |
213 | } |
214 | |
215 | if(op == CTL_OP_NONE) { |
216 | printf("Please specify an operation.\n"); |
217 | printf("\n"); |
218 | ret = -1; |
219 | } |
220 | |
221 | if(op == CTL_OP_DAEMON) { |
222 | if(trace_root == NULL) { |
223 | printf("Please specify -t trace_root_path with the -d option.\n"); |
224 | printf("\n"); |
225 | ret = -1; |
226 | } |
227 | if(channel_root == NULL) { |
228 | printf("Please specify -l ltt_root_path with the -d option.\n"); |
229 | printf("\n"); |
230 | ret = -1; |
231 | } |
232 | } |
233 | |
234 | return ret; |
235 | } |
236 | |
237 | void show_info(void) |
238 | { |
239 | printf("Linux Trace Toolkit Trace Control\n"); |
240 | printf("\n"); |
241 | printf("Controlling trace : %s\n", trace_name); |
242 | printf("\n"); |
243 | } |
244 | |
245 | int lttctl_daemon(struct lttctl_handle *handle, char *trace_name) |
246 | { |
247 | char channel_path[PATH_MAX] = ""; |
248 | pid_t pid; |
249 | int ret; |
250 | char *lttd_path = getenv("LTT_DAEMON"); |
251 | struct sigaction act; |
252 | |
253 | if(lttd_path == NULL) lttd_path = "lttd"; |
254 | |
255 | strcat(channel_path, channel_root); |
256 | strcat(channel_path, "/"); |
257 | strcat(channel_path, trace_name); |
258 | |
259 | |
988614ed |
260 | ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, n_subbufs); |
5adba60f |
261 | if(ret != 0) goto create_error; |
262 | |
263 | act.sa_handler = handler; |
264 | sigemptyset(&(act.sa_mask)); |
265 | sigaddset(&(act.sa_mask), SIGIO); |
266 | sigaction(SIGIO, &act, NULL); |
267 | |
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268 | sigio_received = 0; |
269 | |
5adba60f |
270 | pid = fork(); |
271 | |
272 | if(pid > 0) { |
5adba60f |
273 | /* parent */ |
ada84671 |
274 | while(!sigio_received) pause(); |
5adba60f |
275 | |
276 | /* Now the trace is created, go on and create the supplementary files... */ |
277 | printf("Creating supplementary trace files\n"); |
278 | |
279 | } else if(pid == 0) { |
280 | /* child */ |
281 | int ret = |
282 | execlp(lttd_path, lttd_path, "-t", trace_root, "-c", channel_path, "-s", NULL); |
283 | if(ret) { |
284 | perror("Error in executing the lttd daemon"); |
285 | exit(-1); |
286 | } |
287 | } else { |
288 | /* error */ |
289 | perror("Error in forking for lttd daemon"); |
290 | |
291 | } |
292 | |
293 | ret = lttctl_start(handle, trace_name); |
294 | if(ret != 0) goto start_error; |
295 | |
296 | return 0; |
297 | |
298 | /* error handling */ |
299 | start_error: |
300 | ret |= lttctl_destroy_trace(handle, trace_name); |
301 | create_error: |
302 | return ret; |
303 | } |
304 | |
305 | int main(int argc, char ** argv) |
306 | { |
307 | int ret; |
308 | struct lttctl_handle *handle; |
309 | |
310 | ret = parse_arguments(argc, argv); |
311 | |
312 | if(ret != 0) show_arguments(); |
313 | if(ret < 0) return EINVAL; |
314 | if(ret > 0) return 0; |
315 | |
316 | show_info(); |
317 | |
318 | handle = lttctl_create_handle(); |
319 | |
320 | if(handle == NULL) return -1; |
321 | |
322 | switch(op) { |
323 | case CTL_OP_CREATE: |
988614ed |
324 | ret = lttctl_create_trace(handle, trace_name, mode, subbuf_size, |
325 | n_subbufs); |
1ae7a3c0 |
326 | if(alignment != 0) |
327 | ret |= lttctl_align(handle, trace_name, alignment); |
5adba60f |
328 | break; |
329 | case CTL_OP_DESTROY: |
330 | ret = lttctl_destroy_trace(handle, trace_name); |
331 | break; |
332 | case CTL_OP_START: |
333 | ret = lttctl_start(handle, trace_name); |
334 | break; |
335 | case CTL_OP_STOP: |
336 | ret = lttctl_stop(handle, trace_name); |
337 | break; |
338 | case CTL_OP_DAEMON: |
339 | ret = lttctl_daemon(handle, trace_name); |
340 | break; |
1ae7a3c0 |
341 | case CTL_OP_ALIGN: |
342 | ret = lttctl_align(handle, trace_name, alignment); |
5adba60f |
343 | case CTL_OP_NONE: |
344 | break; |
345 | } |
346 | |
347 | ret |= lttctl_destroy_handle(handle); |
348 | |
349 | return ret; |
350 | } |