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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 | #include <libltt/libltt.h> |
12 | #include <errno.h> |
13 | #include <stdio.h> |
14 | #include <stdlib.h> |
15 | #include <sys/types.h> |
16 | #include <unistd.h> |
17 | #include <signal.h> |
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18 | |
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19 | enum trace_ctl_op { |
20 | CTL_OP_CREATE, |
21 | CTL_OP_DESTROY, |
22 | CTL_OP_START, |
23 | CTL_OP_STOP, |
24 | CTL_OP_DAEMON, |
25 | CTL_OP_NONE |
26 | }; |
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27 | |
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28 | static char *trace_name = NULL; |
29 | static char *mode_name = NULL; |
30 | static enum trace_mode mode = LTT_TRACE_NORMAL; |
31 | static enum trace_ctl_op op = CTL_OP_NONE; |
32 | static char *channel_root = NULL; |
33 | static char *trace_root = NULL; |
34 | |
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35 | static int sigio_received = 0; |
36 | |
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37 | void handler(int signo) |
38 | { |
39 | printf("signal %d received\n", signo); |
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40 | sigio_received = 1; |
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41 | } |
42 | |
43 | |
44 | /* Args : |
45 | * |
46 | */ |
47 | void show_arguments(void) |
48 | { |
49 | printf("Please use the following arguments :\n"); |
50 | printf("\n"); |
51 | printf("-n name Name of the trace.\n"); |
52 | printf("-c mode Create trace channels in mode normal or flight recorder.\n"); |
53 | printf(" Mode values : normal (default) or flight.\n"); |
54 | printf("-r Destroy trace channels.\n"); |
55 | printf("-s Start tracing.\n"); |
56 | //printf(" Note : will automatically create a normal trace if " |
57 | // "none exists.\n"); |
58 | printf("-q Stop tracing.\n"); |
59 | printf("-d Create trace, spawn a lttd daemon, start tracing.\n"); |
60 | printf(" (optionnaly, you can set LTT_DAEMON env. var.)\n"); |
61 | printf("-t Trace root path. (ex. /root/traces/example_trace)\n"); |
62 | printf("-l LTT channels root path. (ex. /mnt/relayfs/ltt)\n"); |
63 | printf("\n"); |
64 | } |
65 | |
66 | |
67 | /* parse_arguments |
68 | * |
69 | * Parses the command line arguments. |
70 | * |
71 | * Returns 1 if the arguments were correct, but doesn't ask for program |
72 | * continuation. Returns -1 if the arguments are incorrect, or 0 if OK. |
73 | */ |
74 | int parse_arguments(int argc, char **argv) |
75 | { |
76 | int ret = 0; |
77 | int argn = 1; |
78 | |
79 | if(argc == 2) { |
80 | if(strcmp(argv[1], "-h") == 0) { |
81 | return 1; |
82 | } |
83 | } |
84 | |
85 | while(argn < argc) { |
86 | |
87 | switch(argv[argn][0]) { |
88 | case '-': |
89 | switch(argv[argn][1]) { |
90 | case 'n': |
91 | if(argn+1 < argc) { |
92 | trace_name = argv[argn+1]; |
93 | argn++; |
94 | } else { |
95 | printf("Specify a trace name after -n.\n", argv[argn]); |
96 | printf("\n"); |
97 | ret = -1; |
98 | } |
99 | |
100 | break; |
101 | case 'c': |
102 | op = CTL_OP_CREATE; |
103 | if(argn+1 < argc) { |
104 | mode_name = argv[argn+1]; |
105 | argn++; |
106 | if(strcmp(mode_name, "normal") == 0) |
107 | mode = LTT_TRACE_NORMAL; |
108 | else if(strcmp(mode_name, "flight") == 0) |
109 | mode = LTT_TRACE_FLIGHT; |
110 | else { |
111 | printf("Invalid mode '%s'.\n", argv[argn]); |
112 | printf("\n"); |
113 | ret = -1; |
114 | } |
115 | } else { |
116 | printf("Specify a mode after -c.\n", argv[argn]); |
117 | printf("\n"); |
118 | ret = -1; |
119 | } |
120 | break; |
121 | case 'r': |
122 | op = CTL_OP_DESTROY; |
123 | break; |
124 | case 's': |
125 | op = CTL_OP_START; |
126 | break; |
127 | case 'q': |
128 | op = CTL_OP_STOP; |
129 | break; |
130 | case 'd': |
131 | op = CTL_OP_DAEMON; |
132 | break; |
133 | case 't': |
134 | if(argn+1 < argc) { |
135 | trace_root = argv[argn+1]; |
136 | argn++; |
137 | } else { |
138 | printf("Specify a trace root path after -t.\n", argv[argn]); |
139 | printf("\n"); |
140 | ret = -1; |
141 | } |
142 | break; |
143 | case 'l': |
144 | if(argn+1 < argc) { |
145 | channel_root = argv[argn+1]; |
146 | argn++; |
147 | } else { |
148 | printf("Specify a channel root path after -l.\n", argv[argn]); |
149 | printf("\n"); |
150 | ret = -1; |
151 | } |
152 | break; |
153 | default: |
154 | printf("Invalid argument '%s'.\n", argv[argn]); |
155 | printf("\n"); |
156 | ret = -1; |
157 | } |
158 | break; |
159 | default: |
160 | printf("Invalid argument '%s'.\n", argv[argn]); |
161 | printf("\n"); |
162 | ret = -1; |
163 | } |
164 | argn++; |
165 | } |
166 | |
167 | if(trace_name == NULL) { |
168 | printf("Please specify a trace name.\n"); |
169 | printf("\n"); |
170 | ret = -1; |
171 | } |
172 | |
173 | if(op == CTL_OP_NONE) { |
174 | printf("Please specify an operation.\n"); |
175 | printf("\n"); |
176 | ret = -1; |
177 | } |
178 | |
179 | if(op == CTL_OP_DAEMON) { |
180 | if(trace_root == NULL) { |
181 | printf("Please specify -t trace_root_path with the -d option.\n"); |
182 | printf("\n"); |
183 | ret = -1; |
184 | } |
185 | if(channel_root == NULL) { |
186 | printf("Please specify -l ltt_root_path with the -d option.\n"); |
187 | printf("\n"); |
188 | ret = -1; |
189 | } |
190 | } |
191 | |
192 | return ret; |
193 | } |
194 | |
195 | void show_info(void) |
196 | { |
197 | printf("Linux Trace Toolkit Trace Control\n"); |
198 | printf("\n"); |
199 | printf("Controlling trace : %s\n", trace_name); |
200 | printf("\n"); |
201 | } |
202 | |
203 | int lttctl_daemon(struct lttctl_handle *handle, char *trace_name) |
204 | { |
205 | char channel_path[PATH_MAX] = ""; |
206 | pid_t pid; |
207 | int ret; |
208 | char *lttd_path = getenv("LTT_DAEMON"); |
209 | struct sigaction act; |
210 | |
211 | if(lttd_path == NULL) lttd_path = "lttd"; |
212 | |
213 | strcat(channel_path, channel_root); |
214 | strcat(channel_path, "/"); |
215 | strcat(channel_path, trace_name); |
216 | |
217 | |
218 | ret = lttctl_create_trace(handle, trace_name, mode); |
219 | if(ret != 0) goto create_error; |
220 | |
221 | act.sa_handler = handler; |
222 | sigemptyset(&(act.sa_mask)); |
223 | sigaddset(&(act.sa_mask), SIGIO); |
224 | sigaction(SIGIO, &act, NULL); |
225 | |
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226 | sigio_received = 0; |
227 | |
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228 | pid = fork(); |
229 | |
230 | if(pid > 0) { |
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231 | /* parent */ |
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232 | while(!sigio_received) pause(); |
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233 | |
234 | /* Now the trace is created, go on and create the supplementary files... */ |
235 | printf("Creating supplementary trace files\n"); |
236 | |
237 | } else if(pid == 0) { |
238 | /* child */ |
239 | int ret = |
240 | execlp(lttd_path, lttd_path, "-t", trace_root, "-c", channel_path, "-s", NULL); |
241 | if(ret) { |
242 | perror("Error in executing the lttd daemon"); |
243 | exit(-1); |
244 | } |
245 | } else { |
246 | /* error */ |
247 | perror("Error in forking for lttd daemon"); |
248 | |
249 | } |
250 | |
251 | ret = lttctl_start(handle, trace_name); |
252 | if(ret != 0) goto start_error; |
253 | |
254 | return 0; |
255 | |
256 | /* error handling */ |
257 | start_error: |
258 | ret |= lttctl_destroy_trace(handle, trace_name); |
259 | create_error: |
260 | return ret; |
261 | } |
262 | |
263 | int main(int argc, char ** argv) |
264 | { |
265 | int ret; |
266 | struct lttctl_handle *handle; |
267 | |
268 | ret = parse_arguments(argc, argv); |
269 | |
270 | if(ret != 0) show_arguments(); |
271 | if(ret < 0) return EINVAL; |
272 | if(ret > 0) return 0; |
273 | |
274 | show_info(); |
275 | |
276 | handle = lttctl_create_handle(); |
277 | |
278 | if(handle == NULL) return -1; |
279 | |
280 | switch(op) { |
281 | case CTL_OP_CREATE: |
282 | ret = lttctl_create_trace(handle, trace_name, mode); |
283 | break; |
284 | case CTL_OP_DESTROY: |
285 | ret = lttctl_destroy_trace(handle, trace_name); |
286 | break; |
287 | case CTL_OP_START: |
288 | ret = lttctl_start(handle, trace_name); |
289 | break; |
290 | case CTL_OP_STOP: |
291 | ret = lttctl_stop(handle, trace_name); |
292 | break; |
293 | case CTL_OP_DAEMON: |
294 | ret = lttctl_daemon(handle, trace_name); |
295 | break; |
296 | case CTL_OP_NONE: |
297 | break; |
298 | } |
299 | |
300 | ret |= lttctl_destroy_handle(handle); |
301 | |
302 | return ret; |
303 | } |