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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 | |
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11 | #ifdef HAVE_CONFIG_H |
12 | #include <config.h> |
13 | #endif |
14 | |
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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> |
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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, |
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; |
34 | static enum trace_mode mode = LTT_TRACE_NORMAL; |
35 | static enum trace_ctl_op op = CTL_OP_NONE; |
36 | static char *channel_root = NULL; |
37 | static char *trace_root = NULL; |
38 | |
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39 | static int sigio_received = 0; |
40 | |
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41 | void handler(int signo) |
42 | { |
43 | printf("signal %d received\n", signo); |
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44 | sigio_received = 1; |
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45 | } |
46 | |
47 | |
48 | /* Args : |
49 | * |
50 | */ |
51 | void show_arguments(void) |
52 | { |
53 | printf("Please use the following arguments :\n"); |
54 | printf("\n"); |
55 | printf("-n name Name of the trace.\n"); |
56 | printf("-c mode Create trace channels in mode normal or flight recorder.\n"); |
57 | printf(" Mode values : normal (default) or flight.\n"); |
58 | printf("-r Destroy trace channels.\n"); |
59 | printf("-s Start tracing.\n"); |
60 | //printf(" Note : will automatically create a normal trace if " |
61 | // "none exists.\n"); |
62 | printf("-q Stop tracing.\n"); |
63 | printf("-d Create trace, spawn a lttd daemon, start tracing.\n"); |
64 | printf(" (optionnaly, you can set LTT_DAEMON env. var.)\n"); |
65 | printf("-t Trace root path. (ex. /root/traces/example_trace)\n"); |
66 | printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n"); |
67 | printf("\n"); |
68 | } |
69 | |
70 | |
71 | /* parse_arguments |
72 | * |
73 | * Parses the command line arguments. |
74 | * |
75 | * Returns 1 if the arguments were correct, but doesn't ask for program |
76 | * continuation. Returns -1 if the arguments are incorrect, or 0 if OK. |
77 | */ |
78 | int parse_arguments(int argc, char **argv) |
79 | { |
80 | int ret = 0; |
81 | int argn = 1; |
82 | |
83 | if(argc == 2) { |
84 | if(strcmp(argv[1], "-h") == 0) { |
85 | return 1; |
86 | } |
87 | } |
88 | |
89 | while(argn < argc) { |
90 | |
91 | switch(argv[argn][0]) { |
92 | case '-': |
93 | switch(argv[argn][1]) { |
94 | case 'n': |
95 | if(argn+1 < argc) { |
96 | trace_name = argv[argn+1]; |
97 | argn++; |
98 | } else { |
99 | printf("Specify a trace name after -n.\n", argv[argn]); |
100 | printf("\n"); |
101 | ret = -1; |
102 | } |
103 | |
104 | break; |
105 | case 'c': |
106 | op = CTL_OP_CREATE; |
107 | if(argn+1 < argc) { |
108 | mode_name = argv[argn+1]; |
109 | argn++; |
110 | if(strcmp(mode_name, "normal") == 0) |
111 | mode = LTT_TRACE_NORMAL; |
112 | else if(strcmp(mode_name, "flight") == 0) |
113 | mode = LTT_TRACE_FLIGHT; |
114 | else { |
115 | printf("Invalid mode '%s'.\n", argv[argn]); |
116 | printf("\n"); |
117 | ret = -1; |
118 | } |
119 | } else { |
120 | printf("Specify a mode after -c.\n", argv[argn]); |
121 | printf("\n"); |
122 | ret = -1; |
123 | } |
124 | break; |
125 | case 'r': |
126 | op = CTL_OP_DESTROY; |
127 | break; |
128 | case 's': |
129 | op = CTL_OP_START; |
130 | break; |
131 | case 'q': |
132 | op = CTL_OP_STOP; |
133 | break; |
134 | case 'd': |
135 | op = CTL_OP_DAEMON; |
136 | break; |
137 | case 't': |
138 | if(argn+1 < argc) { |
139 | trace_root = argv[argn+1]; |
140 | argn++; |
141 | } else { |
142 | printf("Specify a trace root path after -t.\n", argv[argn]); |
143 | printf("\n"); |
144 | ret = -1; |
145 | } |
146 | break; |
147 | case 'l': |
148 | if(argn+1 < argc) { |
149 | channel_root = argv[argn+1]; |
150 | argn++; |
151 | } else { |
152 | printf("Specify a channel root path after -l.\n", argv[argn]); |
153 | printf("\n"); |
154 | ret = -1; |
155 | } |
156 | break; |
157 | default: |
158 | printf("Invalid argument '%s'.\n", argv[argn]); |
159 | printf("\n"); |
160 | ret = -1; |
161 | } |
162 | break; |
163 | default: |
164 | printf("Invalid argument '%s'.\n", argv[argn]); |
165 | printf("\n"); |
166 | ret = -1; |
167 | } |
168 | argn++; |
169 | } |
170 | |
171 | if(trace_name == NULL) { |
172 | printf("Please specify a trace name.\n"); |
173 | printf("\n"); |
174 | ret = -1; |
175 | } |
176 | |
177 | if(op == CTL_OP_NONE) { |
178 | printf("Please specify an operation.\n"); |
179 | printf("\n"); |
180 | ret = -1; |
181 | } |
182 | |
183 | if(op == CTL_OP_DAEMON) { |
184 | if(trace_root == NULL) { |
185 | printf("Please specify -t trace_root_path with the -d option.\n"); |
186 | printf("\n"); |
187 | ret = -1; |
188 | } |
189 | if(channel_root == NULL) { |
190 | printf("Please specify -l ltt_root_path with the -d option.\n"); |
191 | printf("\n"); |
192 | ret = -1; |
193 | } |
194 | } |
195 | |
196 | return ret; |
197 | } |
198 | |
199 | void show_info(void) |
200 | { |
201 | printf("Linux Trace Toolkit Trace Control\n"); |
202 | printf("\n"); |
203 | printf("Controlling trace : %s\n", trace_name); |
204 | printf("\n"); |
205 | } |
206 | |
207 | int lttctl_daemon(struct lttctl_handle *handle, char *trace_name) |
208 | { |
209 | char channel_path[PATH_MAX] = ""; |
210 | pid_t pid; |
211 | int ret; |
212 | char *lttd_path = getenv("LTT_DAEMON"); |
213 | struct sigaction act; |
214 | |
215 | if(lttd_path == NULL) lttd_path = "lttd"; |
216 | |
217 | strcat(channel_path, channel_root); |
218 | strcat(channel_path, "/"); |
219 | strcat(channel_path, trace_name); |
220 | |
221 | |
222 | ret = lttctl_create_trace(handle, trace_name, mode); |
223 | if(ret != 0) goto create_error; |
224 | |
225 | act.sa_handler = handler; |
226 | sigemptyset(&(act.sa_mask)); |
227 | sigaddset(&(act.sa_mask), SIGIO); |
228 | sigaction(SIGIO, &act, NULL); |
229 | |
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230 | sigio_received = 0; |
231 | |
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232 | pid = fork(); |
233 | |
234 | if(pid > 0) { |
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235 | /* parent */ |
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236 | while(!sigio_received) pause(); |
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237 | |
238 | /* Now the trace is created, go on and create the supplementary files... */ |
239 | printf("Creating supplementary trace files\n"); |
240 | |
241 | } else if(pid == 0) { |
242 | /* child */ |
243 | int ret = |
244 | execlp(lttd_path, lttd_path, "-t", trace_root, "-c", channel_path, "-s", NULL); |
245 | if(ret) { |
246 | perror("Error in executing the lttd daemon"); |
247 | exit(-1); |
248 | } |
249 | } else { |
250 | /* error */ |
251 | perror("Error in forking for lttd daemon"); |
252 | |
253 | } |
254 | |
255 | ret = lttctl_start(handle, trace_name); |
256 | if(ret != 0) goto start_error; |
257 | |
258 | return 0; |
259 | |
260 | /* error handling */ |
261 | start_error: |
262 | ret |= lttctl_destroy_trace(handle, trace_name); |
263 | create_error: |
264 | return ret; |
265 | } |
266 | |
267 | int main(int argc, char ** argv) |
268 | { |
269 | int ret; |
270 | struct lttctl_handle *handle; |
271 | |
272 | ret = parse_arguments(argc, argv); |
273 | |
274 | if(ret != 0) show_arguments(); |
275 | if(ret < 0) return EINVAL; |
276 | if(ret > 0) return 0; |
277 | |
278 | show_info(); |
279 | |
280 | handle = lttctl_create_handle(); |
281 | |
282 | if(handle == NULL) return -1; |
283 | |
284 | switch(op) { |
285 | case CTL_OP_CREATE: |
286 | ret = lttctl_create_trace(handle, trace_name, mode); |
287 | break; |
288 | case CTL_OP_DESTROY: |
289 | ret = lttctl_destroy_trace(handle, trace_name); |
290 | break; |
291 | case CTL_OP_START: |
292 | ret = lttctl_start(handle, trace_name); |
293 | break; |
294 | case CTL_OP_STOP: |
295 | ret = lttctl_stop(handle, trace_name); |
296 | break; |
297 | case CTL_OP_DAEMON: |
298 | ret = lttctl_daemon(handle, trace_name); |
299 | break; |
300 | case CTL_OP_NONE: |
301 | break; |
302 | } |
303 | |
304 | ret |= lttctl_destroy_handle(handle); |
305 | |
306 | return ret; |
307 | } |