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