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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/exec_cmd.h" |
12 | #include "util/cache.h" |
13 | #include "util/quote.h" |
14 | #include "util/run-command.h" |
15 | #include "util/parse-events.h" |
16 | #include "util/debugfs.h" |
17 | |
18 | const char perf_usage_string[] = |
19 | "perf [--version] [--help] COMMAND [ARGS]"; |
20 | |
21 | const char perf_more_info_string[] = |
22 | "See 'perf help COMMAND' for more information on a specific command."; |
23 | |
24 | int use_browser = -1; |
25 | static int use_pager = -1; |
26 | |
27 | struct pager_config { |
28 | const char *cmd; |
29 | int val; |
30 | }; |
31 | |
32 | static int pager_command_config(const char *var, const char *value, void *data) |
33 | { |
34 | struct pager_config *c = data; |
35 | if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) |
36 | c->val = perf_config_bool(var, value); |
37 | return 0; |
38 | } |
39 | |
40 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ |
41 | int check_pager_config(const char *cmd) |
42 | { |
43 | struct pager_config c; |
44 | c.cmd = cmd; |
45 | c.val = -1; |
46 | perf_config(pager_command_config, &c); |
47 | return c.val; |
48 | } |
49 | |
50 | static int tui_command_config(const char *var, const char *value, void *data) |
51 | { |
52 | struct pager_config *c = data; |
53 | if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd)) |
54 | c->val = perf_config_bool(var, value); |
55 | return 0; |
56 | } |
57 | |
58 | /* returns 0 for "no tui", 1 for "use tui", and -1 for "not specified" */ |
59 | static int check_tui_config(const char *cmd) |
60 | { |
61 | struct pager_config c; |
62 | c.cmd = cmd; |
63 | c.val = -1; |
64 | perf_config(tui_command_config, &c); |
65 | return c.val; |
66 | } |
67 | |
68 | static void commit_pager_choice(void) |
69 | { |
70 | switch (use_pager) { |
71 | case 0: |
72 | setenv("PERF_PAGER", "cat", 1); |
73 | break; |
74 | case 1: |
75 | /* setup_pager(); */ |
76 | break; |
77 | default: |
78 | break; |
79 | } |
80 | } |
81 | |
82 | static int handle_options(const char ***argv, int *argc, int *envchanged) |
83 | { |
84 | int handled = 0; |
85 | |
86 | while (*argc > 0) { |
87 | const char *cmd = (*argv)[0]; |
88 | if (cmd[0] != '-') |
89 | break; |
90 | |
91 | /* |
92 | * For legacy reasons, the "version" and "help" |
93 | * commands can be written with "--" prepended |
94 | * to make them look like flags. |
95 | */ |
96 | if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) |
97 | break; |
98 | |
99 | /* |
100 | * Check remaining flags. |
101 | */ |
102 | if (!prefixcmp(cmd, CMD_EXEC_PATH)) { |
103 | cmd += strlen(CMD_EXEC_PATH); |
104 | if (*cmd == '=') |
105 | perf_set_argv_exec_path(cmd + 1); |
106 | else { |
107 | puts(perf_exec_path()); |
108 | exit(0); |
109 | } |
110 | } else if (!strcmp(cmd, "--html-path")) { |
111 | puts(system_path(PERF_HTML_PATH)); |
112 | exit(0); |
113 | } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { |
114 | use_pager = 1; |
115 | } else if (!strcmp(cmd, "--no-pager")) { |
116 | use_pager = 0; |
117 | if (envchanged) |
118 | *envchanged = 1; |
119 | } else if (!strcmp(cmd, "--perf-dir")) { |
120 | if (*argc < 2) { |
121 | fprintf(stderr, "No directory given for --perf-dir.\n"); |
122 | usage(perf_usage_string); |
123 | } |
124 | setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1); |
125 | if (envchanged) |
126 | *envchanged = 1; |
127 | (*argv)++; |
128 | (*argc)--; |
129 | handled++; |
130 | } else if (!prefixcmp(cmd, CMD_PERF_DIR)) { |
131 | setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1); |
132 | if (envchanged) |
133 | *envchanged = 1; |
134 | } else if (!strcmp(cmd, "--work-tree")) { |
135 | if (*argc < 2) { |
136 | fprintf(stderr, "No directory given for --work-tree.\n"); |
137 | usage(perf_usage_string); |
138 | } |
139 | setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); |
140 | if (envchanged) |
141 | *envchanged = 1; |
142 | (*argv)++; |
143 | (*argc)--; |
144 | } else if (!prefixcmp(cmd, CMD_WORK_TREE)) { |
145 | setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1); |
146 | if (envchanged) |
147 | *envchanged = 1; |
148 | } else if (!strcmp(cmd, "--debugfs-dir")) { |
149 | if (*argc < 2) { |
150 | fprintf(stderr, "No directory given for --debugfs-dir.\n"); |
151 | usage(perf_usage_string); |
152 | } |
153 | debugfs_set_path((*argv)[1]); |
154 | if (envchanged) |
155 | *envchanged = 1; |
156 | (*argv)++; |
157 | (*argc)--; |
158 | } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) { |
159 | debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR)); |
160 | fprintf(stderr, "dir: %s\n", debugfs_mountpoint); |
161 | if (envchanged) |
162 | *envchanged = 1; |
163 | } else { |
164 | fprintf(stderr, "Unknown option: %s\n", cmd); |
165 | usage(perf_usage_string); |
166 | } |
167 | |
168 | (*argv)++; |
169 | (*argc)--; |
170 | handled++; |
171 | } |
172 | return handled; |
173 | } |
174 | |
175 | static int handle_alias(int *argcp, const char ***argv) |
176 | { |
177 | int envchanged = 0, ret = 0, saved_errno = errno; |
178 | int count, option_count; |
179 | const char **new_argv; |
180 | const char *alias_command; |
181 | char *alias_string; |
182 | |
183 | alias_command = (*argv)[0]; |
184 | alias_string = alias_lookup(alias_command); |
185 | if (alias_string) { |
186 | if (alias_string[0] == '!') { |
187 | if (*argcp > 1) { |
188 | struct strbuf buf; |
189 | |
190 | strbuf_init(&buf, PATH_MAX); |
191 | strbuf_addstr(&buf, alias_string); |
192 | sq_quote_argv(&buf, (*argv) + 1, PATH_MAX); |
193 | free(alias_string); |
194 | alias_string = buf.buf; |
195 | } |
196 | ret = system(alias_string + 1); |
197 | if (ret >= 0 && WIFEXITED(ret) && |
198 | WEXITSTATUS(ret) != 127) |
199 | exit(WEXITSTATUS(ret)); |
200 | die("Failed to run '%s' when expanding alias '%s'", |
201 | alias_string + 1, alias_command); |
202 | } |
203 | count = split_cmdline(alias_string, &new_argv); |
204 | if (count < 0) |
205 | die("Bad alias.%s string", alias_command); |
206 | option_count = handle_options(&new_argv, &count, &envchanged); |
207 | if (envchanged) |
208 | die("alias '%s' changes environment variables\n" |
209 | "You can use '!perf' in the alias to do this.", |
210 | alias_command); |
211 | memmove(new_argv - option_count, new_argv, |
212 | count * sizeof(char *)); |
213 | new_argv -= option_count; |
214 | |
215 | if (count < 1) |
216 | die("empty alias for %s", alias_command); |
217 | |
218 | if (!strcmp(alias_command, new_argv[0])) |
219 | die("recursive alias: %s", alias_command); |
220 | |
221 | new_argv = realloc(new_argv, sizeof(char *) * |
222 | (count + *argcp + 1)); |
223 | /* insert after command name */ |
224 | memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp); |
225 | new_argv[count + *argcp] = NULL; |
226 | |
227 | *argv = new_argv; |
228 | *argcp += count - 1; |
229 | |
230 | ret = 1; |
231 | } |
232 | |
233 | errno = saved_errno; |
234 | |
235 | return ret; |
236 | } |
237 | |
238 | const char perf_version_string[] = PERF_VERSION; |
239 | |
240 | #define RUN_SETUP (1<<0) |
241 | #define USE_PAGER (1<<1) |
242 | /* |
243 | * require working tree to be present -- anything uses this needs |
244 | * RUN_SETUP for reading from the configuration file. |
245 | */ |
246 | #define NEED_WORK_TREE (1<<2) |
247 | |
248 | struct cmd_struct { |
249 | const char *cmd; |
250 | int (*fn)(int, const char **, const char *); |
251 | int option; |
252 | }; |
253 | |
254 | static int run_builtin(struct cmd_struct *p, int argc, const char **argv) |
255 | { |
256 | int status; |
257 | struct stat st; |
258 | const char *prefix; |
259 | |
260 | prefix = NULL; |
261 | if (p->option & RUN_SETUP) |
262 | prefix = NULL; /* setup_perf_directory(); */ |
263 | |
264 | if (use_browser == -1) |
265 | use_browser = check_tui_config(p->cmd); |
266 | |
267 | if (use_pager == -1 && p->option & RUN_SETUP) |
268 | use_pager = check_pager_config(p->cmd); |
269 | if (use_pager == -1 && p->option & USE_PAGER) |
270 | use_pager = 1; |
271 | commit_pager_choice(); |
272 | |
273 | status = p->fn(argc, argv, prefix); |
274 | exit_browser(status); |
275 | |
276 | if (status) |
277 | return status & 0xff; |
278 | |
279 | /* Somebody closed stdout? */ |
280 | if (fstat(fileno(stdout), &st)) |
281 | return 0; |
282 | /* Ignore write errors for pipes and sockets.. */ |
283 | if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) |
284 | return 0; |
285 | |
286 | /* Check for ENOSPC and EIO errors.. */ |
287 | if (fflush(stdout)) |
288 | die("write failure on standard output: %s", strerror(errno)); |
289 | if (ferror(stdout)) |
290 | die("unknown write failure on standard output"); |
291 | if (fclose(stdout)) |
292 | die("close failed on standard output: %s", strerror(errno)); |
293 | return 0; |
294 | } |
295 | |
296 | static void handle_internal_command(int argc, const char **argv) |
297 | { |
298 | const char *cmd = argv[0]; |
299 | static struct cmd_struct commands[] = { |
300 | { "buildid-cache", cmd_buildid_cache, 0 }, |
301 | { "buildid-list", cmd_buildid_list, 0 }, |
302 | { "diff", cmd_diff, 0 }, |
303 | { "evlist", cmd_evlist, 0 }, |
304 | { "help", cmd_help, 0 }, |
305 | { "list", cmd_list, 0 }, |
306 | { "record", cmd_record, 0 }, |
307 | { "report", cmd_report, 0 }, |
308 | { "bench", cmd_bench, 0 }, |
309 | { "stat", cmd_stat, 0 }, |
310 | { "timechart", cmd_timechart, 0 }, |
311 | { "top", cmd_top, 0 }, |
312 | { "annotate", cmd_annotate, 0 }, |
313 | { "version", cmd_version, 0 }, |
314 | { "script", cmd_script, 0 }, |
315 | { "sched", cmd_sched, 0 }, |
316 | { "probe", cmd_probe, 0 }, |
317 | { "kmem", cmd_kmem, 0 }, |
318 | { "lock", cmd_lock, 0 }, |
319 | { "kvm", cmd_kvm, 0 }, |
320 | { "test", cmd_test, 0 }, |
321 | { "inject", cmd_inject, 0 }, |
322 | }; |
323 | unsigned int i; |
324 | static const char ext[] = STRIP_EXTENSION; |
325 | |
326 | if (sizeof(ext) > 1) { |
327 | i = strlen(argv[0]) - strlen(ext); |
328 | if (i > 0 && !strcmp(argv[0] + i, ext)) { |
329 | char *argv0 = strdup(argv[0]); |
330 | argv[0] = cmd = argv0; |
331 | argv0[i] = '\0'; |
332 | } |
333 | } |
334 | |
335 | /* Turn "perf cmd --help" into "perf help cmd" */ |
336 | if (argc > 1 && !strcmp(argv[1], "--help")) { |
337 | argv[1] = argv[0]; |
338 | argv[0] = cmd = "help"; |
339 | } |
340 | |
341 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
342 | struct cmd_struct *p = commands+i; |
343 | if (strcmp(p->cmd, cmd)) |
344 | continue; |
345 | exit(run_builtin(p, argc, argv)); |
346 | } |
347 | } |
348 | |
349 | static void execv_dashed_external(const char **argv) |
350 | { |
351 | struct strbuf cmd = STRBUF_INIT; |
352 | const char *tmp; |
353 | int status; |
354 | |
355 | strbuf_addf(&cmd, "perf-%s", argv[0]); |
356 | |
357 | /* |
358 | * argv[0] must be the perf command, but the argv array |
359 | * belongs to the caller, and may be reused in |
360 | * subsequent loop iterations. Save argv[0] and |
361 | * restore it on error. |
362 | */ |
363 | tmp = argv[0]; |
364 | argv[0] = cmd.buf; |
365 | |
366 | /* |
367 | * if we fail because the command is not found, it is |
368 | * OK to return. Otherwise, we just pass along the status code. |
369 | */ |
370 | status = run_command_v_opt(argv, 0); |
371 | if (status != -ERR_RUN_COMMAND_EXEC) { |
372 | if (IS_RUN_COMMAND_ERR(status)) |
373 | die("unable to run '%s'", argv[0]); |
374 | exit(-status); |
375 | } |
376 | errno = ENOENT; /* as if we called execvp */ |
377 | |
378 | argv[0] = tmp; |
379 | |
380 | strbuf_release(&cmd); |
381 | } |
382 | |
383 | static int run_argv(int *argcp, const char ***argv) |
384 | { |
385 | int done_alias = 0; |
386 | |
387 | while (1) { |
388 | /* See if it's an internal command */ |
389 | handle_internal_command(*argcp, *argv); |
390 | |
391 | /* .. then try the external ones */ |
392 | execv_dashed_external(*argv); |
393 | |
394 | /* It could be an alias -- this works around the insanity |
395 | * of overriding "perf log" with "perf show" by having |
396 | * alias.log = show |
397 | */ |
398 | if (done_alias || !handle_alias(argcp, argv)) |
399 | break; |
400 | done_alias = 1; |
401 | } |
402 | |
403 | return done_alias; |
404 | } |
405 | |
406 | static void pthread__block_sigwinch(void) |
407 | { |
408 | sigset_t set; |
409 | |
410 | sigemptyset(&set); |
411 | sigaddset(&set, SIGWINCH); |
412 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
413 | } |
414 | |
415 | void pthread__unblock_sigwinch(void) |
416 | { |
417 | sigset_t set; |
418 | |
419 | sigemptyset(&set); |
420 | sigaddset(&set, SIGWINCH); |
421 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); |
422 | } |
423 | |
424 | int main(int argc, const char **argv) |
425 | { |
426 | const char *cmd; |
427 | |
428 | cmd = perf_extract_argv0_path(argv[0]); |
429 | if (!cmd) |
430 | cmd = "perf-help"; |
431 | /* get debugfs mount point from /proc/mounts */ |
432 | debugfs_mount(NULL); |
433 | /* |
434 | * "perf-xxxx" is the same as "perf xxxx", but we obviously: |
435 | * |
436 | * - cannot take flags in between the "perf" and the "xxxx". |
437 | * - cannot execute it externally (since it would just do |
438 | * the same thing over again) |
439 | * |
440 | * So we just directly call the internal command handler, and |
441 | * die if that one cannot handle it. |
442 | */ |
443 | if (!prefixcmp(cmd, "perf-")) { |
444 | cmd += 5; |
445 | argv[0] = cmd; |
446 | handle_internal_command(argc, argv); |
447 | die("cannot handle %s internally", cmd); |
448 | } |
449 | |
450 | /* Look for flags.. */ |
451 | argv++; |
452 | argc--; |
453 | handle_options(&argv, &argc, NULL); |
454 | commit_pager_choice(); |
455 | set_buildid_dir(); |
456 | |
457 | if (argc > 0) { |
458 | if (!prefixcmp(argv[0], "--")) |
459 | argv[0] += 2; |
460 | } else { |
461 | /* The user didn't specify a command; give them help */ |
462 | printf("\n usage: %s\n\n", perf_usage_string); |
463 | list_common_cmds_help(); |
464 | printf("\n %s\n\n", perf_more_info_string); |
465 | exit(1); |
466 | } |
467 | cmd = argv[0]; |
468 | |
469 | /* |
470 | * We use PATH to find perf commands, but we prepend some higher |
471 | * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH |
472 | * environment, and the $(perfexecdir) from the Makefile at build |
473 | * time. |
474 | */ |
475 | setup_path(); |
476 | /* |
477 | * Block SIGWINCH notifications so that the thread that wants it can |
478 | * unblock and get syscalls like select interrupted instead of waiting |
479 | * forever while the signal goes to some other non interested thread. |
480 | */ |
481 | pthread__block_sigwinch(); |
482 | |
483 | while (1) { |
484 | static int done_help; |
485 | static int was_alias; |
486 | |
487 | was_alias = run_argv(&argc, &argv); |
488 | if (errno != ENOENT) |
489 | break; |
490 | |
491 | if (was_alias) { |
492 | fprintf(stderr, "Expansion of alias '%s' failed; " |
493 | "'%s' is not a perf-command\n", |
494 | cmd, argv[0]); |
495 | exit(1); |
496 | } |
497 | if (!done_help) { |
498 | cmd = argv[0] = help_unknown_cmd(cmd); |
499 | done_help = 1; |
500 | } else |
501 | break; |
502 | } |
503 | |
504 | fprintf(stderr, "Failed to run command '%s': %s\n", |
505 | cmd, strerror(errno)); |
506 | |
507 | return 1; |
508 | } |
509 |
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