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