| 1 | /* |
| 2 | * perf.c |
| 3 | * |
| 4 | * Performance analysis utility. |
| 5 | * |
| 6 | * This is the main hub from which the sub-commands (perf stat, |
| 7 | * perf top, perf record, perf report, etc.) are started. |
| 8 | */ |
| 9 | #include "builtin.h" |
| 10 | |
| 11 | #include "util/env.h" |
| 12 | #include <subcmd/exec-cmd.h> |
| 13 | #include "util/cache.h" |
| 14 | #include "util/quote.h" |
| 15 | #include <subcmd/run-command.h> |
| 16 | #include "util/parse-events.h" |
| 17 | #include <subcmd/parse-options.h> |
| 18 | #include "util/bpf-loader.h" |
| 19 | #include "util/debug.h" |
| 20 | #include <api/fs/fs.h> |
| 21 | #include <api/fs/tracing_path.h> |
| 22 | #include <pthread.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <time.h> |
| 25 | |
| 26 | const char perf_usage_string[] = |
| 27 | "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]"; |
| 28 | |
| 29 | const char perf_more_info_string[] = |
| 30 | "See 'perf help COMMAND' for more information on a specific command."; |
| 31 | |
| 32 | int use_browser = -1; |
| 33 | static int use_pager = -1; |
| 34 | const char *input_name; |
| 35 | |
| 36 | struct cmd_struct { |
| 37 | const char *cmd; |
| 38 | int (*fn)(int, const char **, const char *); |
| 39 | int option; |
| 40 | }; |
| 41 | |
| 42 | static struct cmd_struct commands[] = { |
| 43 | { "buildid-cache", cmd_buildid_cache, 0 }, |
| 44 | { "buildid-list", cmd_buildid_list, 0 }, |
| 45 | { "config", cmd_config, 0 }, |
| 46 | { "diff", cmd_diff, 0 }, |
| 47 | { "evlist", cmd_evlist, 0 }, |
| 48 | { "help", cmd_help, 0 }, |
| 49 | { "list", cmd_list, 0 }, |
| 50 | { "record", cmd_record, 0 }, |
| 51 | { "report", cmd_report, 0 }, |
| 52 | { "bench", cmd_bench, 0 }, |
| 53 | { "stat", cmd_stat, 0 }, |
| 54 | { "timechart", cmd_timechart, 0 }, |
| 55 | { "top", cmd_top, 0 }, |
| 56 | { "annotate", cmd_annotate, 0 }, |
| 57 | { "version", cmd_version, 0 }, |
| 58 | { "script", cmd_script, 0 }, |
| 59 | { "sched", cmd_sched, 0 }, |
| 60 | #ifdef HAVE_LIBELF_SUPPORT |
| 61 | { "probe", cmd_probe, 0 }, |
| 62 | #endif |
| 63 | { "kmem", cmd_kmem, 0 }, |
| 64 | { "lock", cmd_lock, 0 }, |
| 65 | { "kvm", cmd_kvm, 0 }, |
| 66 | { "test", cmd_test, 0 }, |
| 67 | #ifdef HAVE_LIBAUDIT_SUPPORT |
| 68 | { "trace", cmd_trace, 0 }, |
| 69 | #endif |
| 70 | { "inject", cmd_inject, 0 }, |
| 71 | { "mem", cmd_mem, 0 }, |
| 72 | { "data", cmd_data, 0 }, |
| 73 | }; |
| 74 | |
| 75 | struct pager_config { |
| 76 | const char *cmd; |
| 77 | int val; |
| 78 | }; |
| 79 | |
| 80 | static int pager_command_config(const char *var, const char *value, void *data) |
| 81 | { |
| 82 | struct pager_config *c = data; |
| 83 | if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) |
| 84 | c->val = perf_config_bool(var, value); |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ |
| 89 | int check_pager_config(const char *cmd) |
| 90 | { |
| 91 | struct pager_config c; |
| 92 | c.cmd = cmd; |
| 93 | c.val = -1; |
| 94 | perf_config(pager_command_config, &c); |
| 95 | return c.val; |
| 96 | } |
| 97 | |
| 98 | static int browser_command_config(const char *var, const char *value, void *data) |
| 99 | { |
| 100 | struct pager_config *c = data; |
| 101 | if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd)) |
| 102 | c->val = perf_config_bool(var, value); |
| 103 | if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd)) |
| 104 | c->val = perf_config_bool(var, value) ? 2 : 0; |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk", |
| 110 | * and -1 for "not specified" |
| 111 | */ |
| 112 | static int check_browser_config(const char *cmd) |
| 113 | { |
| 114 | struct pager_config c; |
| 115 | c.cmd = cmd; |
| 116 | c.val = -1; |
| 117 | perf_config(browser_command_config, &c); |
| 118 | return c.val; |
| 119 | } |
| 120 | |
| 121 | static void commit_pager_choice(void) |
| 122 | { |
| 123 | switch (use_pager) { |
| 124 | case 0: |
| 125 | setenv(PERF_PAGER_ENVIRONMENT, "cat", 1); |
| 126 | break; |
| 127 | case 1: |
| 128 | /* setup_pager(); */ |
| 129 | break; |
| 130 | default: |
| 131 | break; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | struct option options[] = { |
| 136 | OPT_ARGUMENT("help", "help"), |
| 137 | OPT_ARGUMENT("version", "version"), |
| 138 | OPT_ARGUMENT("exec-path", "exec-path"), |
| 139 | OPT_ARGUMENT("html-path", "html-path"), |
| 140 | OPT_ARGUMENT("paginate", "paginate"), |
| 141 | OPT_ARGUMENT("no-pager", "no-pager"), |
| 142 | OPT_ARGUMENT("perf-dir", "perf-dir"), |
| 143 | OPT_ARGUMENT("work-tree", "work-tree"), |
| 144 | OPT_ARGUMENT("debugfs-dir", "debugfs-dir"), |
| 145 | OPT_ARGUMENT("buildid-dir", "buildid-dir"), |
| 146 | OPT_ARGUMENT("list-cmds", "list-cmds"), |
| 147 | OPT_ARGUMENT("list-opts", "list-opts"), |
| 148 | OPT_ARGUMENT("debug", "debug"), |
| 149 | OPT_END() |
| 150 | }; |
| 151 | |
| 152 | static int handle_options(const char ***argv, int *argc, int *envchanged) |
| 153 | { |
| 154 | int handled = 0; |
| 155 | |
| 156 | while (*argc > 0) { |
| 157 | const char *cmd = (*argv)[0]; |
| 158 | if (cmd[0] != '-') |
| 159 | break; |
| 160 | |
| 161 | /* |
| 162 | * For legacy reasons, the "version" and "help" |
| 163 | * commands can be written with "--" prepended |
| 164 | * to make them look like flags. |
| 165 | */ |
| 166 | if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) |
| 167 | break; |
| 168 | |
| 169 | /* |
| 170 | * Shortcut for '-h' and '-v' options to invoke help |
| 171 | * and version command. |
| 172 | */ |
| 173 | if (!strcmp(cmd, "-h")) { |
| 174 | (*argv)[0] = "--help"; |
| 175 | break; |
| 176 | } |
| 177 | |
| 178 | if (!strcmp(cmd, "-v")) { |
| 179 | (*argv)[0] = "--version"; |
| 180 | break; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Check remaining flags. |
| 185 | */ |
| 186 | if (!prefixcmp(cmd, CMD_EXEC_PATH)) { |
| 187 | cmd += strlen(CMD_EXEC_PATH); |
| 188 | if (*cmd == '=') |
| 189 | set_argv_exec_path(cmd + 1); |
| 190 | else { |
| 191 | puts(get_argv_exec_path()); |
| 192 | exit(0); |
| 193 | } |
| 194 | } else if (!strcmp(cmd, "--html-path")) { |
| 195 | puts(system_path(PERF_HTML_PATH)); |
| 196 | exit(0); |
| 197 | } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { |
| 198 | use_pager = 1; |
| 199 | } else if (!strcmp(cmd, "--no-pager")) { |
| 200 | use_pager = 0; |
| 201 | if (envchanged) |
| 202 | *envchanged = 1; |
| 203 | } else if (!strcmp(cmd, "--perf-dir")) { |
| 204 | if (*argc < 2) { |
| 205 | fprintf(stderr, "No directory given for --perf-dir.\n"); |
| 206 | usage(perf_usage_string); |
| 207 | } |
| 208 | setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1); |
| 209 | if (envchanged) |
| 210 | *envchanged = 1; |
| 211 | (*argv)++; |
| 212 | (*argc)--; |
| 213 | handled++; |
| 214 | } else if (!prefixcmp(cmd, CMD_PERF_DIR)) { |
| 215 | setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1); |
| 216 | if (envchanged) |
| 217 | *envchanged = 1; |
| 218 | } else if (!strcmp(cmd, "--work-tree")) { |
| 219 | if (*argc < 2) { |
| 220 | fprintf(stderr, "No directory given for --work-tree.\n"); |
| 221 | usage(perf_usage_string); |
| 222 | } |
| 223 | setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); |
| 224 | if (envchanged) |
| 225 | *envchanged = 1; |
| 226 | (*argv)++; |
| 227 | (*argc)--; |
| 228 | } else if (!prefixcmp(cmd, CMD_WORK_TREE)) { |
| 229 | setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1); |
| 230 | if (envchanged) |
| 231 | *envchanged = 1; |
| 232 | } else if (!strcmp(cmd, "--debugfs-dir")) { |
| 233 | if (*argc < 2) { |
| 234 | fprintf(stderr, "No directory given for --debugfs-dir.\n"); |
| 235 | usage(perf_usage_string); |
| 236 | } |
| 237 | tracing_path_set((*argv)[1]); |
| 238 | if (envchanged) |
| 239 | *envchanged = 1; |
| 240 | (*argv)++; |
| 241 | (*argc)--; |
| 242 | } else if (!strcmp(cmd, "--buildid-dir")) { |
| 243 | if (*argc < 2) { |
| 244 | fprintf(stderr, "No directory given for --buildid-dir.\n"); |
| 245 | usage(perf_usage_string); |
| 246 | } |
| 247 | set_buildid_dir((*argv)[1]); |
| 248 | if (envchanged) |
| 249 | *envchanged = 1; |
| 250 | (*argv)++; |
| 251 | (*argc)--; |
| 252 | } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) { |
| 253 | tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR)); |
| 254 | fprintf(stderr, "dir: %s\n", tracing_path); |
| 255 | if (envchanged) |
| 256 | *envchanged = 1; |
| 257 | } else if (!strcmp(cmd, "--list-cmds")) { |
| 258 | unsigned int i; |
| 259 | |
| 260 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
| 261 | struct cmd_struct *p = commands+i; |
| 262 | printf("%s ", p->cmd); |
| 263 | } |
| 264 | putchar('\n'); |
| 265 | exit(0); |
| 266 | } else if (!strcmp(cmd, "--list-opts")) { |
| 267 | unsigned int i; |
| 268 | |
| 269 | for (i = 0; i < ARRAY_SIZE(options)-1; i++) { |
| 270 | struct option *p = options+i; |
| 271 | printf("--%s ", p->long_name); |
| 272 | } |
| 273 | putchar('\n'); |
| 274 | exit(0); |
| 275 | } else if (!strcmp(cmd, "--debug")) { |
| 276 | if (*argc < 2) { |
| 277 | fprintf(stderr, "No variable specified for --debug.\n"); |
| 278 | usage(perf_usage_string); |
| 279 | } |
| 280 | if (perf_debug_option((*argv)[1])) |
| 281 | usage(perf_usage_string); |
| 282 | |
| 283 | (*argv)++; |
| 284 | (*argc)--; |
| 285 | } else { |
| 286 | fprintf(stderr, "Unknown option: %s\n", cmd); |
| 287 | usage(perf_usage_string); |
| 288 | } |
| 289 | |
| 290 | (*argv)++; |
| 291 | (*argc)--; |
| 292 | handled++; |
| 293 | } |
| 294 | return handled; |
| 295 | } |
| 296 | |
| 297 | static int handle_alias(int *argcp, const char ***argv) |
| 298 | { |
| 299 | int envchanged = 0, ret = 0, saved_errno = errno; |
| 300 | int count, option_count; |
| 301 | const char **new_argv; |
| 302 | const char *alias_command; |
| 303 | char *alias_string; |
| 304 | |
| 305 | alias_command = (*argv)[0]; |
| 306 | alias_string = alias_lookup(alias_command); |
| 307 | if (alias_string) { |
| 308 | if (alias_string[0] == '!') { |
| 309 | if (*argcp > 1) { |
| 310 | struct strbuf buf; |
| 311 | |
| 312 | if (strbuf_init(&buf, PATH_MAX) < 0 || |
| 313 | strbuf_addstr(&buf, alias_string) < 0 || |
| 314 | sq_quote_argv(&buf, (*argv) + 1, |
| 315 | PATH_MAX) < 0) |
| 316 | die("Failed to allocate memory."); |
| 317 | free(alias_string); |
| 318 | alias_string = buf.buf; |
| 319 | } |
| 320 | ret = system(alias_string + 1); |
| 321 | if (ret >= 0 && WIFEXITED(ret) && |
| 322 | WEXITSTATUS(ret) != 127) |
| 323 | exit(WEXITSTATUS(ret)); |
| 324 | die("Failed to run '%s' when expanding alias '%s'", |
| 325 | alias_string + 1, alias_command); |
| 326 | } |
| 327 | count = split_cmdline(alias_string, &new_argv); |
| 328 | if (count < 0) |
| 329 | die("Bad alias.%s string", alias_command); |
| 330 | option_count = handle_options(&new_argv, &count, &envchanged); |
| 331 | if (envchanged) |
| 332 | die("alias '%s' changes environment variables\n" |
| 333 | "You can use '!perf' in the alias to do this.", |
| 334 | alias_command); |
| 335 | memmove(new_argv - option_count, new_argv, |
| 336 | count * sizeof(char *)); |
| 337 | new_argv -= option_count; |
| 338 | |
| 339 | if (count < 1) |
| 340 | die("empty alias for %s", alias_command); |
| 341 | |
| 342 | if (!strcmp(alias_command, new_argv[0])) |
| 343 | die("recursive alias: %s", alias_command); |
| 344 | |
| 345 | new_argv = realloc(new_argv, sizeof(char *) * |
| 346 | (count + *argcp + 1)); |
| 347 | /* insert after command name */ |
| 348 | memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp); |
| 349 | new_argv[count + *argcp] = NULL; |
| 350 | |
| 351 | *argv = new_argv; |
| 352 | *argcp += count - 1; |
| 353 | |
| 354 | ret = 1; |
| 355 | } |
| 356 | |
| 357 | errno = saved_errno; |
| 358 | |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | const char perf_version_string[] = PERF_VERSION; |
| 363 | |
| 364 | #define RUN_SETUP (1<<0) |
| 365 | #define USE_PAGER (1<<1) |
| 366 | /* |
| 367 | * require working tree to be present -- anything uses this needs |
| 368 | * RUN_SETUP for reading from the configuration file. |
| 369 | */ |
| 370 | #define NEED_WORK_TREE (1<<2) |
| 371 | |
| 372 | static int run_builtin(struct cmd_struct *p, int argc, const char **argv) |
| 373 | { |
| 374 | int status; |
| 375 | struct stat st; |
| 376 | const char *prefix; |
| 377 | char sbuf[STRERR_BUFSIZE]; |
| 378 | |
| 379 | prefix = NULL; |
| 380 | if (p->option & RUN_SETUP) |
| 381 | prefix = NULL; /* setup_perf_directory(); */ |
| 382 | |
| 383 | if (use_browser == -1) |
| 384 | use_browser = check_browser_config(p->cmd); |
| 385 | |
| 386 | if (use_pager == -1 && p->option & RUN_SETUP) |
| 387 | use_pager = check_pager_config(p->cmd); |
| 388 | if (use_pager == -1 && p->option & USE_PAGER) |
| 389 | use_pager = 1; |
| 390 | commit_pager_choice(); |
| 391 | |
| 392 | perf_env__set_cmdline(&perf_env, argc, argv); |
| 393 | status = p->fn(argc, argv, prefix); |
| 394 | exit_browser(status); |
| 395 | perf_env__exit(&perf_env); |
| 396 | bpf__clear(); |
| 397 | |
| 398 | if (status) |
| 399 | return status & 0xff; |
| 400 | |
| 401 | /* Somebody closed stdout? */ |
| 402 | if (fstat(fileno(stdout), &st)) |
| 403 | return 0; |
| 404 | /* Ignore write errors for pipes and sockets.. */ |
| 405 | if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) |
| 406 | return 0; |
| 407 | |
| 408 | status = 1; |
| 409 | /* Check for ENOSPC and EIO errors.. */ |
| 410 | if (fflush(stdout)) { |
| 411 | fprintf(stderr, "write failure on standard output: %s", |
| 412 | strerror_r(errno, sbuf, sizeof(sbuf))); |
| 413 | goto out; |
| 414 | } |
| 415 | if (ferror(stdout)) { |
| 416 | fprintf(stderr, "unknown write failure on standard output"); |
| 417 | goto out; |
| 418 | } |
| 419 | if (fclose(stdout)) { |
| 420 | fprintf(stderr, "close failed on standard output: %s", |
| 421 | strerror_r(errno, sbuf, sizeof(sbuf))); |
| 422 | goto out; |
| 423 | } |
| 424 | status = 0; |
| 425 | out: |
| 426 | return status; |
| 427 | } |
| 428 | |
| 429 | static void handle_internal_command(int argc, const char **argv) |
| 430 | { |
| 431 | const char *cmd = argv[0]; |
| 432 | unsigned int i; |
| 433 | static const char ext[] = STRIP_EXTENSION; |
| 434 | |
| 435 | if (sizeof(ext) > 1) { |
| 436 | i = strlen(argv[0]) - strlen(ext); |
| 437 | if (i > 0 && !strcmp(argv[0] + i, ext)) { |
| 438 | char *argv0 = strdup(argv[0]); |
| 439 | argv[0] = cmd = argv0; |
| 440 | argv0[i] = '\0'; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | /* Turn "perf cmd --help" into "perf help cmd" */ |
| 445 | if (argc > 1 && !strcmp(argv[1], "--help")) { |
| 446 | argv[1] = argv[0]; |
| 447 | argv[0] = cmd = "help"; |
| 448 | } |
| 449 | |
| 450 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
| 451 | struct cmd_struct *p = commands+i; |
| 452 | if (strcmp(p->cmd, cmd)) |
| 453 | continue; |
| 454 | exit(run_builtin(p, argc, argv)); |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | static void execv_dashed_external(const char **argv) |
| 459 | { |
| 460 | char *cmd; |
| 461 | const char *tmp; |
| 462 | int status; |
| 463 | |
| 464 | if (asprintf(&cmd, "perf-%s", argv[0]) < 0) |
| 465 | goto do_die; |
| 466 | |
| 467 | /* |
| 468 | * argv[0] must be the perf command, but the argv array |
| 469 | * belongs to the caller, and may be reused in |
| 470 | * subsequent loop iterations. Save argv[0] and |
| 471 | * restore it on error. |
| 472 | */ |
| 473 | tmp = argv[0]; |
| 474 | argv[0] = cmd; |
| 475 | |
| 476 | /* |
| 477 | * if we fail because the command is not found, it is |
| 478 | * OK to return. Otherwise, we just pass along the status code. |
| 479 | */ |
| 480 | status = run_command_v_opt(argv, 0); |
| 481 | if (status != -ERR_RUN_COMMAND_EXEC) { |
| 482 | if (IS_RUN_COMMAND_ERR(status)) { |
| 483 | do_die: |
| 484 | die("unable to run '%s'", argv[0]); |
| 485 | } |
| 486 | exit(-status); |
| 487 | } |
| 488 | errno = ENOENT; /* as if we called execvp */ |
| 489 | |
| 490 | argv[0] = tmp; |
| 491 | zfree(&cmd); |
| 492 | } |
| 493 | |
| 494 | static int run_argv(int *argcp, const char ***argv) |
| 495 | { |
| 496 | int done_alias = 0; |
| 497 | |
| 498 | while (1) { |
| 499 | /* See if it's an internal command */ |
| 500 | handle_internal_command(*argcp, *argv); |
| 501 | |
| 502 | /* .. then try the external ones */ |
| 503 | execv_dashed_external(*argv); |
| 504 | |
| 505 | /* It could be an alias -- this works around the insanity |
| 506 | * of overriding "perf log" with "perf show" by having |
| 507 | * alias.log = show |
| 508 | */ |
| 509 | if (done_alias || !handle_alias(argcp, argv)) |
| 510 | break; |
| 511 | done_alias = 1; |
| 512 | } |
| 513 | |
| 514 | return done_alias; |
| 515 | } |
| 516 | |
| 517 | static void pthread__block_sigwinch(void) |
| 518 | { |
| 519 | sigset_t set; |
| 520 | |
| 521 | sigemptyset(&set); |
| 522 | sigaddset(&set, SIGWINCH); |
| 523 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
| 524 | } |
| 525 | |
| 526 | void pthread__unblock_sigwinch(void) |
| 527 | { |
| 528 | sigset_t set; |
| 529 | |
| 530 | sigemptyset(&set); |
| 531 | sigaddset(&set, SIGWINCH); |
| 532 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); |
| 533 | } |
| 534 | |
| 535 | int main(int argc, const char **argv) |
| 536 | { |
| 537 | const char *cmd; |
| 538 | char sbuf[STRERR_BUFSIZE]; |
| 539 | int value; |
| 540 | |
| 541 | /* libsubcmd init */ |
| 542 | exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT); |
| 543 | pager_init(PERF_PAGER_ENVIRONMENT); |
| 544 | |
| 545 | /* The page_size is placed in util object. */ |
| 546 | page_size = sysconf(_SC_PAGE_SIZE); |
| 547 | cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE); |
| 548 | |
| 549 | if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0) |
| 550 | sysctl_perf_event_max_stack = value; |
| 551 | |
| 552 | if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0) |
| 553 | sysctl_perf_event_max_contexts_per_stack = value; |
| 554 | |
| 555 | cmd = extract_argv0_path(argv[0]); |
| 556 | if (!cmd) |
| 557 | cmd = "perf-help"; |
| 558 | |
| 559 | srandom(time(NULL)); |
| 560 | |
| 561 | perf_config(perf_default_config, NULL); |
| 562 | set_buildid_dir(NULL); |
| 563 | |
| 564 | /* get debugfs/tracefs mount point from /proc/mounts */ |
| 565 | tracing_path_mount(); |
| 566 | |
| 567 | /* |
| 568 | * "perf-xxxx" is the same as "perf xxxx", but we obviously: |
| 569 | * |
| 570 | * - cannot take flags in between the "perf" and the "xxxx". |
| 571 | * - cannot execute it externally (since it would just do |
| 572 | * the same thing over again) |
| 573 | * |
| 574 | * So we just directly call the internal command handler, and |
| 575 | * die if that one cannot handle it. |
| 576 | */ |
| 577 | if (!prefixcmp(cmd, "perf-")) { |
| 578 | cmd += 5; |
| 579 | argv[0] = cmd; |
| 580 | handle_internal_command(argc, argv); |
| 581 | fprintf(stderr, "cannot handle %s internally", cmd); |
| 582 | goto out; |
| 583 | } |
| 584 | if (!prefixcmp(cmd, "trace")) { |
| 585 | #ifdef HAVE_LIBAUDIT_SUPPORT |
| 586 | setup_path(); |
| 587 | argv[0] = "trace"; |
| 588 | return cmd_trace(argc, argv, NULL); |
| 589 | #else |
| 590 | fprintf(stderr, |
| 591 | "trace command not available: missing audit-libs devel package at build time.\n"); |
| 592 | goto out; |
| 593 | #endif |
| 594 | } |
| 595 | /* Look for flags.. */ |
| 596 | argv++; |
| 597 | argc--; |
| 598 | handle_options(&argv, &argc, NULL); |
| 599 | commit_pager_choice(); |
| 600 | |
| 601 | if (argc > 0) { |
| 602 | if (!prefixcmp(argv[0], "--")) |
| 603 | argv[0] += 2; |
| 604 | } else { |
| 605 | /* The user didn't specify a command; give them help */ |
| 606 | printf("\n usage: %s\n\n", perf_usage_string); |
| 607 | list_common_cmds_help(); |
| 608 | printf("\n %s\n\n", perf_more_info_string); |
| 609 | goto out; |
| 610 | } |
| 611 | cmd = argv[0]; |
| 612 | |
| 613 | test_attr__init(); |
| 614 | |
| 615 | /* |
| 616 | * We use PATH to find perf commands, but we prepend some higher |
| 617 | * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH |
| 618 | * environment, and the $(perfexecdir) from the Makefile at build |
| 619 | * time. |
| 620 | */ |
| 621 | setup_path(); |
| 622 | /* |
| 623 | * Block SIGWINCH notifications so that the thread that wants it can |
| 624 | * unblock and get syscalls like select interrupted instead of waiting |
| 625 | * forever while the signal goes to some other non interested thread. |
| 626 | */ |
| 627 | pthread__block_sigwinch(); |
| 628 | |
| 629 | perf_debug_setup(); |
| 630 | |
| 631 | while (1) { |
| 632 | static int done_help; |
| 633 | int was_alias = run_argv(&argc, &argv); |
| 634 | |
| 635 | if (errno != ENOENT) |
| 636 | break; |
| 637 | |
| 638 | if (was_alias) { |
| 639 | fprintf(stderr, "Expansion of alias '%s' failed; " |
| 640 | "'%s' is not a perf-command\n", |
| 641 | cmd, argv[0]); |
| 642 | goto out; |
| 643 | } |
| 644 | if (!done_help) { |
| 645 | cmd = argv[0] = help_unknown_cmd(cmd); |
| 646 | done_help = 1; |
| 647 | } else |
| 648 | break; |
| 649 | } |
| 650 | |
| 651 | fprintf(stderr, "Failed to run command '%s': %s\n", |
| 652 | cmd, strerror_r(errno, sbuf, sizeof(sbuf))); |
| 653 | out: |
| 654 | return 1; |
| 655 | } |