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