[mirror_ubuntu-zesty-kernel.git] / tools / perf / perf.c

/*
 * perf.c
 *
 * Performance analysis utility.
 *
 * This is the main hub from which the sub-commands (perf stat,
 * perf top, perf record, perf report, etc.) are started.
 */
#include "builtin.h"

#include "util/env.h"
#include "util/exec_cmd.h"
#include "util/cache.h"
#include "util/quote.h"
#include "util/run-command.h"
#include "util/parse-events.h"
#include "util/parse-options.h"
#include "util/debug.h"
#include <api/fs/tracing_path.h>
#include <pthread.h>

const char perf_usage_string[] =
	"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";

const char perf_more_info_string[] =
	"See 'perf help COMMAND' for more information on a specific command.";

int use_browser = -1;
static int use_pager = -1;
const char *input_name;

struct cmd_struct {
	const char *cmd;
	int (*fn)(int, const char **, const char *);
	int option;
};

static struct cmd_struct commands[] = {
	{ "buildid-cache", cmd_buildid_cache, 0 },
	{ "buildid-list", cmd_buildid_list, 0 },
	{ "diff",	cmd_diff,	0 },
	{ "evlist",	cmd_evlist,	0 },
	{ "help",	cmd_help,	0 },
	{ "list",	cmd_list,	0 },
	{ "record",	cmd_record,	0 },
	{ "report",	cmd_report,	0 },
	{ "bench",	cmd_bench,	0 },
	{ "stat",	cmd_stat,	0 },
	{ "timechart",	cmd_timechart,	0 },
	{ "top",	cmd_top,	0 },
	{ "annotate",	cmd_annotate,	0 },
	{ "version",	cmd_version,	0 },
	{ "script",	cmd_script,	0 },
	{ "sched",	cmd_sched,	0 },
#ifdef HAVE_LIBELF_SUPPORT
	{ "probe",	cmd_probe,	0 },
#endif
	{ "kmem",	cmd_kmem,	0 },
	{ "lock",	cmd_lock,	0 },
	{ "kvm",	cmd_kvm,	0 },
	{ "test",	cmd_test,	0 },
#ifdef HAVE_LIBAUDIT_SUPPORT
	{ "trace",	cmd_trace,	0 },
#endif
	{ "inject",	cmd_inject,	0 },
	{ "mem",	cmd_mem,	0 },
	{ "data",	cmd_data,	0 },
};

struct pager_config {
	const char *cmd;
	int val;
};

static int pager_command_config(const char *var, const char *value, void *data)
{
	struct pager_config *c = data;
	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
		c->val = perf_config_bool(var, value);
	return 0;
}

/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
int check_pager_config(const char *cmd)
{
	struct pager_config c;
	c.cmd = cmd;
	c.val = -1;
	perf_config(pager_command_config, &c);
	return c.val;
}

static int browser_command_config(const char *var, const char *value, void *data)
{
	struct pager_config *c = data;
	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
		c->val = perf_config_bool(var, value);
	if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
		c->val = perf_config_bool(var, value) ? 2 : 0;
	return 0;
}

/*
 * returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
 * and -1 for "not specified"
 */
static int check_browser_config(const char *cmd)
{
	struct pager_config c;
	c.cmd = cmd;
	c.val = -1;
	perf_config(browser_command_config, &c);
	return c.val;
}

static void commit_pager_choice(void)
{
	switch (use_pager) {
	case 0:
		setenv("PERF_PAGER", "cat", 1);
		break;
	case 1:
		/* setup_pager(); */
		break;
	default:
		break;
	}
}

struct option options[] = {
	OPT_ARGUMENT("help", "help"),
	OPT_ARGUMENT("version", "version"),
	OPT_ARGUMENT("exec-path", "exec-path"),
	OPT_ARGUMENT("html-path", "html-path"),
	OPT_ARGUMENT("paginate", "paginate"),
	OPT_ARGUMENT("no-pager", "no-pager"),
	OPT_ARGUMENT("perf-dir", "perf-dir"),
	OPT_ARGUMENT("work-tree", "work-tree"),
	OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
	OPT_ARGUMENT("buildid-dir", "buildid-dir"),
	OPT_ARGUMENT("list-cmds", "list-cmds"),
	OPT_ARGUMENT("list-opts", "list-opts"),
	OPT_ARGUMENT("debug", "debug"),
	OPT_END()
};

static int handle_options(const char ***argv, int *argc, int *envchanged)
{
	int handled = 0;

	while (*argc > 0) {
		const char *cmd = (*argv)[0];
		if (cmd[0] != '-')
			break;

		/*
		 * For legacy reasons, the "version" and "help"
		 * commands can be written with "--" prepended
		 * to make them look like flags.
		 */
		if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
			break;

		/*
		 * Shortcut for '-h' and '-v' options to invoke help
		 * and version command.
		 */
		if (!strcmp(cmd, "-h")) {
			(*argv)[0] = "--help";
			break;
		}

		if (!strcmp(cmd, "-v")) {
			(*argv)[0] = "--version";
			break;
		}

		/*
		 * Check remaining flags.
		 */
		if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
			cmd += strlen(CMD_EXEC_PATH);
			if (*cmd == '=')
				perf_set_argv_exec_path(cmd + 1);
			else {
				puts(perf_exec_path());
				exit(0);
			}
		} else if (!strcmp(cmd, "--html-path")) {
			puts(system_path(PERF_HTML_PATH));
			exit(0);
		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
			use_pager = 1;
		} else if (!strcmp(cmd, "--no-pager")) {
			use_pager = 0;
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--perf-dir")) {
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --perf-dir.\n");
				usage(perf_usage_string);
			}
			setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
			handled++;
		} else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
			setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--work-tree")) {
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --work-tree.\n");
				usage(perf_usage_string);
			}
			setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
			setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--debugfs-dir")) {
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --debugfs-dir.\n");
				usage(perf_usage_string);
			}
			tracing_path_set((*argv)[1]);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (!strcmp(cmd, "--buildid-dir")) {
			if (*argc < 2) {
				fprintf(stderr, "No directory given for --buildid-dir.\n");
				usage(perf_usage_string);
			}
			set_buildid_dir((*argv)[1]);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
			tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
			fprintf(stderr, "dir: %s\n", tracing_path);
			if (envchanged)
				*envchanged = 1;
		} else if (!strcmp(cmd, "--list-cmds")) {
			unsigned int i;

			for (i = 0; i < ARRAY_SIZE(commands); i++) {
				struct cmd_struct *p = commands+i;
				printf("%s ", p->cmd);
			}
			putchar('\n');
			exit(0);
		} else if (!strcmp(cmd, "--list-opts")) {
			unsigned int i;

			for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
				struct option *p = options+i;
				printf("--%s ", p->long_name);
			}
			putchar('\n');
			exit(0);
		} else if (!strcmp(cmd, "--debug")) {
			if (*argc < 2) {
				fprintf(stderr, "No variable specified for --debug.\n");
				usage(perf_usage_string);
			}
			if (perf_debug_option((*argv)[1]))
				usage(perf_usage_string);

			(*argv)++;
			(*argc)--;
		} else {
			fprintf(stderr, "Unknown option: %s\n", cmd);
			usage(perf_usage_string);
		}

		(*argv)++;
		(*argc)--;
		handled++;
	}
	return handled;
}

static int handle_alias(int *argcp, const char ***argv)
{
	int envchanged = 0, ret = 0, saved_errno = errno;
	int count, option_count;
	const char **new_argv;
	const char *alias_command;
	char *alias_string;

	alias_command = (*argv)[0];
	alias_string = alias_lookup(alias_command);
	if (alias_string) {
		if (alias_string[0] == '!') {
			if (*argcp > 1) {
				struct strbuf buf;

				strbuf_init(&buf, PATH_MAX);
				strbuf_addstr(&buf, alias_string);
				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
				free(alias_string);
				alias_string = buf.buf;
			}
			ret = system(alias_string + 1);
			if (ret >= 0 && WIFEXITED(ret) &&
			    WEXITSTATUS(ret) != 127)
				exit(WEXITSTATUS(ret));
			die("Failed to run '%s' when expanding alias '%s'",
			    alias_string + 1, alias_command);
		}
		count = split_cmdline(alias_string, &new_argv);
		if (count < 0)
			die("Bad alias.%s string", alias_command);
		option_count = handle_options(&new_argv, &count, &envchanged);
		if (envchanged)
			die("alias '%s' changes environment variables\n"
				 "You can use '!perf' in the alias to do this.",
				 alias_command);
		memmove(new_argv - option_count, new_argv,
				count * sizeof(char *));
		new_argv -= option_count;

		if (count < 1)
			die("empty alias for %s", alias_command);

		if (!strcmp(alias_command, new_argv[0]))
			die("recursive alias: %s", alias_command);

		new_argv = realloc(new_argv, sizeof(char *) *
				    (count + *argcp + 1));
		/* insert after command name */
		memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
		new_argv[count + *argcp] = NULL;

		*argv = new_argv;
		*argcp += count - 1;

		ret = 1;
	}

	errno = saved_errno;

	return ret;
}

const char perf_version_string[] = PERF_VERSION;

#define RUN_SETUP	(1<<0)
#define USE_PAGER	(1<<1)
/*
 * require working tree to be present -- anything uses this needs
 * RUN_SETUP for reading from the configuration file.
 */
#define NEED_WORK_TREE	(1<<2)

static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
{
	int status;
	struct stat st;
	const char *prefix;
	char sbuf[STRERR_BUFSIZE];

	prefix = NULL;
	if (p->option & RUN_SETUP)
		prefix = NULL; /* setup_perf_directory(); */

	if (use_browser == -1)
		use_browser = check_browser_config(p->cmd);

	if (use_pager == -1 && p->option & RUN_SETUP)
		use_pager = check_pager_config(p->cmd);
	if (use_pager == -1 && p->option & USE_PAGER)
		use_pager = 1;
	commit_pager_choice();

	status = p->fn(argc, argv, prefix);
	exit_browser(status);
	perf_env__exit(&perf_env);

	if (status)
		return status & 0xff;

	/* Somebody closed stdout? */
	if (fstat(fileno(stdout), &st))
		return 0;
	/* Ignore write errors for pipes and sockets.. */
	if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
		return 0;

	status = 1;
	/* Check for ENOSPC and EIO errors.. */
	if (fflush(stdout)) {
		fprintf(stderr, "write failure on standard output: %s",
			strerror_r(errno, sbuf, sizeof(sbuf)));
		goto out;
	}
	if (ferror(stdout)) {
		fprintf(stderr, "unknown write failure on standard output");
		goto out;
	}
	if (fclose(stdout)) {
		fprintf(stderr, "close failed on standard output: %s",
			strerror_r(errno, sbuf, sizeof(sbuf)));
		goto out;
	}
	status = 0;
out:
	return status;
}

static void handle_internal_command(int argc, const char **argv)
{
	const char *cmd = argv[0];
	unsigned int i;
	static const char ext[] = STRIP_EXTENSION;

	if (sizeof(ext) > 1) {
		i = strlen(argv[0]) - strlen(ext);
		if (i > 0 && !strcmp(argv[0] + i, ext)) {
			char *argv0 = strdup(argv[0]);
			argv[0] = cmd = argv0;
			argv0[i] = '\0';
		}
	}

	/* Turn "perf cmd --help" into "perf help cmd" */
	if (argc > 1 && !strcmp(argv[1], "--help")) {
		argv[1] = argv[0];
		argv[0] = cmd = "help";
	}

	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		struct cmd_struct *p = commands+i;
		if (strcmp(p->cmd, cmd))
			continue;
		exit(run_builtin(p, argc, argv));
	}
}

static void execv_dashed_external(const char **argv)
{
	struct strbuf cmd = STRBUF_INIT;
	const char *tmp;
	int status;

	strbuf_addf(&cmd, "perf-%s", argv[0]);

	/*
	 * argv[0] must be the perf command, but the argv array
	 * belongs to the caller, and may be reused in
	 * subsequent loop iterations. Save argv[0] and
	 * restore it on error.
	 */
	tmp = argv[0];
	argv[0] = cmd.buf;

	/*
	 * if we fail because the command is not found, it is
	 * OK to return. Otherwise, we just pass along the status code.
	 */
	status = run_command_v_opt(argv, 0);
	if (status != -ERR_RUN_COMMAND_EXEC) {
		if (IS_RUN_COMMAND_ERR(status))
			die("unable to run '%s'", argv[0]);
		exit(-status);
	}
	errno = ENOENT; /* as if we called execvp */

	argv[0] = tmp;

	strbuf_release(&cmd);
}

static int run_argv(int *argcp, const char ***argv)
{
	int done_alias = 0;

	while (1) {
		/* See if it's an internal command */
		handle_internal_command(*argcp, *argv);

		/* .. then try the external ones */
		execv_dashed_external(*argv);

		/* It could be an alias -- this works around the insanity
		 * of overriding "perf log" with "perf show" by having
		 * alias.log = show
		 */
		if (done_alias || !handle_alias(argcp, argv))
			break;
		done_alias = 1;
	}

	return done_alias;
}

static void pthread__block_sigwinch(void)
{
	sigset_t set;

	sigemptyset(&set);
	sigaddset(&set, SIGWINCH);
	pthread_sigmask(SIG_BLOCK, &set, NULL);
}

void pthread__unblock_sigwinch(void)
{
	sigset_t set;

	sigemptyset(&set);
	sigaddset(&set, SIGWINCH);
	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
}

int main(int argc, const char **argv)
{
	const char *cmd;
	char sbuf[STRERR_BUFSIZE];

	/* The page_size is placed in util object. */
	page_size = sysconf(_SC_PAGE_SIZE);
	cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);

	cmd = perf_extract_argv0_path(argv[0]);
	if (!cmd)
		cmd = "perf-help";

	/* get debugfs/tracefs mount point from /proc/mounts */
	tracing_path_mount();

	/*
	 * "perf-xxxx" is the same as "perf xxxx", but we obviously:
	 *
	 *  - cannot take flags in between the "perf" and the "xxxx".
	 *  - cannot execute it externally (since it would just do
	 *    the same thing over again)
	 *
	 * So we just directly call the internal command handler, and
	 * die if that one cannot handle it.
	 */
	if (!prefixcmp(cmd, "perf-")) {
		cmd += 5;
		argv[0] = cmd;
		handle_internal_command(argc, argv);
		fprintf(stderr, "cannot handle %s internally", cmd);
		goto out;
	}
	if (!prefixcmp(cmd, "trace")) {
#ifdef HAVE_LIBAUDIT_SUPPORT
		set_buildid_dir(NULL);
		setup_path();
		argv[0] = "trace";
		return cmd_trace(argc, argv, NULL);
#else
		fprintf(stderr,
			"trace command not available: missing audit-libs devel package at build time.\n");
		goto out;
#endif
	}
	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc, NULL);
	commit_pager_choice();
	set_buildid_dir(NULL);

	if (argc > 0) {
		if (!prefixcmp(argv[0], "--"))
			argv[0] += 2;
	} else {
		/* The user didn't specify a command; give them help */
		printf("\n usage: %s\n\n", perf_usage_string);
		list_common_cmds_help();
		printf("\n %s\n\n", perf_more_info_string);
		goto out;
	}
	cmd = argv[0];

	test_attr__init();

	/*
	 * We use PATH to find perf commands, but we prepend some higher
	 * precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
	 * environment, and the $(perfexecdir) from the Makefile at build
	 * time.
	 */
	setup_path();
	/*
	 * Block SIGWINCH notifications so that the thread that wants it can
	 * unblock and get syscalls like select interrupted instead of waiting
	 * forever while the signal goes to some other non interested thread.
	 */
	pthread__block_sigwinch();

	while (1) {
		static int done_help;
		int was_alias = run_argv(&argc, &argv);

		if (errno != ENOENT)
			break;

		if (was_alias) {
			fprintf(stderr, "Expansion of alias '%s' failed; "
				"'%s' is not a perf-command\n",
				cmd, argv[0]);
			goto out;
		}
		if (!done_help) {
			cmd = argv[0] = help_unknown_cmd(cmd);
			done_help = 1;
		} else
			break;
	}

	fprintf(stderr, "Failed to run command '%s': %s\n",
		cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
out:
	return 1;
}
Commit	Line	Data
bf9e1876 IM	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	*/
07800601	9	#include "builtin.h"
bf9e1876	10
aa36ddd7	11	#include "util/env.h"
148be2c1 IM	12	#include "util/exec_cmd.h"
	13	#include "util/cache.h"
	14	#include "util/quote.h"
	15	#include "util/run-command.h"
5beeded1	16	#include "util/parse-events.h"
7335399a	17	#include "util/parse-options.h"
bbb2cea7	18	#include "util/debug.h"
592d5a6b	19	#include <api/fs/tracing_path.h>
27683dc5	20	#include <pthread.h>
07800601 IM	21
07800601 IM	22	const char perf_usage_string[] =
78a1b503	23	"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
07800601 IM	24
	25	const char perf_more_info_string[] =
	26	"See 'perf help COMMAND' for more information on a specific command.";
	27
5d06e691	28	int use_browser = -1;
07800601	29	static int use_pager = -1;
70cb4e96	30	const char *input_name;
5d06e691	31
98a4179c FW	32	struct cmd_struct {
	33	const char *cmd;
	34	int (fn)(int, const char , const char );
	35	int option;
	36	};
	37
	38	static struct cmd_struct commands[] = {
	39	{ "buildid-cache", cmd_buildid_cache, 0 },
	40	{ "buildid-list", cmd_buildid_list, 0 },
	41	{ "diff", cmd_diff, 0 },
	42	{ "evlist", cmd_evlist, 0 },
	43	{ "help", cmd_help, 0 },
	44	{ "list", cmd_list, 0 },
	45	{ "record", cmd_record, 0 },
	46	{ "report", cmd_report, 0 },
	47	{ "bench", cmd_bench, 0 },
	48	{ "stat", cmd_stat, 0 },
	49	{ "timechart", cmd_timechart, 0 },
	50	{ "top", cmd_top, 0 },
	51	{ "annotate", cmd_annotate, 0 },
	52	{ "version", cmd_version, 0 },
	53	{ "script", cmd_script, 0 },
	54	{ "sched", cmd_sched, 0 },
89fe808a	55	#ifdef HAVE_LIBELF_SUPPORT
98a4179c	56	{ "probe", cmd_probe, 0 },
393be2e3	57	#endif
98a4179c FW	58	{ "kmem", cmd_kmem, 0 },
	59	{ "lock", cmd_lock, 0 },
	60	{ "kvm", cmd_kvm, 0 },
	61	{ "test", cmd_test, 0 },
89fe808a	62	#ifdef HAVE_LIBAUDIT_SUPPORT
514f1c67	63	{ "trace", cmd_trace, 0 },
4d29089c	64	#endif
98a4179c	65	{ "inject", cmd_inject, 0 },
028f12ee	66	{ "mem", cmd_mem, 0 },
2245bf14	67	{ "data", cmd_data, 0 },
98a4179c FW	68	};
98a4179c FW	69
07800601 IM	70	struct pager_config {
	71	const char *cmd;
	72	int val;
	73	};
	74
	75	static int pager_command_config(const char var, const char value, void *data)
	76	{
	77	struct pager_config *c = data;
	78	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	79	c->val = perf_config_bool(var, value);
	80	return 0;
	81	}
	82
	83	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	84	int check_pager_config(const char *cmd)
	85	{
	86	struct pager_config c;
	87	c.cmd = cmd;
	88	c.val = -1;
	89	perf_config(pager_command_config, &c);
	90	return c.val;
	91	}
	92
0020ce23	93	static int browser_command_config(const char var, const char value, void *data)
5d06e691 ACM	94	{
	95	struct pager_config *c = data;
	96	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
	97	c->val = perf_config_bool(var, value);
0020ce23 NK	98	if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
0020ce23 NK	99	c->val = perf_config_bool(var, value) ? 2 : 0;
5d06e691 ACM	100	return 0;
	101	}
	102
0020ce23 NK	103	/*
	104	* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
	105	* and -1 for "not specified"
	106	*/
	107	static int check_browser_config(const char *cmd)
5d06e691 ACM	108	{
	109	struct pager_config c;
	110	c.cmd = cmd;
	111	c.val = -1;
0020ce23	112	perf_config(browser_command_config, &c);
5d06e691 ACM	113	return c.val;
	114	}
	115
4c574159 TF	116	static void commit_pager_choice(void)
4c574159 TF	117	{
07800601 IM	118	switch (use_pager) {
	119	case 0:
	120	setenv("PERF_PAGER", "cat", 1);
	121	break;
	122	case 1:
	123	/* setup_pager(); */
	124	break;
	125	default:
	126	break;
	127	}
	128	}
	129
7335399a YS	130	struct option options[] = {
	131	OPT_ARGUMENT("help", "help"),
	132	OPT_ARGUMENT("version", "version"),
	133	OPT_ARGUMENT("exec-path", "exec-path"),
	134	OPT_ARGUMENT("html-path", "html-path"),
	135	OPT_ARGUMENT("paginate", "paginate"),
	136	OPT_ARGUMENT("no-pager", "no-pager"),
	137	OPT_ARGUMENT("perf-dir", "perf-dir"),
	138	OPT_ARGUMENT("work-tree", "work-tree"),
	139	OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
	140	OPT_ARGUMENT("buildid-dir", "buildid-dir"),
	141	OPT_ARGUMENT("list-cmds", "list-cmds"),
	142	OPT_ARGUMENT("list-opts", "list-opts"),
	143	OPT_ARGUMENT("debug", "debug"),
	144	OPT_END()
	145	};
	146
4c574159	147	static int handle_options(const char **argv, int argc, int *envchanged)
07800601 IM	148	{
	149	int handled = 0;
	150
	151	while (*argc > 0) {
	152	const char cmd = (argv)[0];
	153	if (cmd[0] != '-')
	154	break;
	155
	156	/*
	157	* For legacy reasons, the "version" and "help"
	158	* commands can be written with "--" prepended
	159	* to make them look like flags.
	160	*/
	161	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	162	break;
	163
a1853e2c JO	164	/*
	165	* Shortcut for '-h' and '-v' options to invoke help
	166	* and version command.
	167	*/
	168	if (!strcmp(cmd, "-h")) {
	169	(*argv)[0] = "--help";
	170	break;
	171	}
	172
	173	if (!strcmp(cmd, "-v")) {
	174	(*argv)[0] = "--version";
	175	break;
	176	}
	177
07800601 IM	178	/*
	179	* Check remaining flags.
	180	*/
cfed95a6 VL	181	if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
cfed95a6 VL	182	cmd += strlen(CMD_EXEC_PATH);
07800601 IM	183	if (*cmd == '=')
	184	perf_set_argv_exec_path(cmd + 1);
	185	else {
	186	puts(perf_exec_path());
	187	exit(0);
	188	}
	189	} else if (!strcmp(cmd, "--html-path")) {
	190	puts(system_path(PERF_HTML_PATH));
	191	exit(0);
	192	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
	193	use_pager = 1;
	194	} else if (!strcmp(cmd, "--no-pager")) {
	195	use_pager = 0;
	196	if (envchanged)
	197	*envchanged = 1;
	198	} else if (!strcmp(cmd, "--perf-dir")) {
	199	if (*argc < 2) {
4c574159	200	fprintf(stderr, "No directory given for --perf-dir.\n");
07800601 IM	201	usage(perf_usage_string);
	202	}
	203	setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
	204	if (envchanged)
	205	*envchanged = 1;
	206	(*argv)++;
	207	(*argc)--;
	208	handled++;
cfed95a6 VL	209	} else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
cfed95a6 VL	210	setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
07800601 IM	211	if (envchanged)
	212	*envchanged = 1;
	213	} else if (!strcmp(cmd, "--work-tree")) {
	214	if (*argc < 2) {
4c574159	215	fprintf(stderr, "No directory given for --work-tree.\n");
07800601 IM	216	usage(perf_usage_string);
	217	}
	218	setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
	219	if (envchanged)
	220	*envchanged = 1;
	221	(*argv)++;
	222	(*argc)--;
cfed95a6 VL	223	} else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
cfed95a6 VL	224	setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
07800601 IM	225	if (envchanged)
07800601 IM	226	*envchanged = 1;
5beeded1 JB	227	} else if (!strcmp(cmd, "--debugfs-dir")) {
	228	if (*argc < 2) {
	229	fprintf(stderr, "No directory given for --debugfs-dir.\n");
	230	usage(perf_usage_string);
	231	}
65d4b265	232	tracing_path_set((*argv)[1]);
5beeded1 JB	233	if (envchanged)
	234	*envchanged = 1;
	235	(*argv)++;
	236	(*argc)--;
99ce8e9f JO	237	} else if (!strcmp(cmd, "--buildid-dir")) {
	238	if (*argc < 2) {
	239	fprintf(stderr, "No directory given for --buildid-dir.\n");
	240	usage(perf_usage_string);
	241	}
	242	set_buildid_dir((*argv)[1]);
	243	if (envchanged)
	244	*envchanged = 1;
	245	(*argv)++;
	246	(*argc)--;
cfed95a6	247	} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
65d4b265	248	tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
9f30fffc	249	fprintf(stderr, "dir: %s\n", tracing_path);
5beeded1 JB	250	if (envchanged)
5beeded1 JB	251	*envchanged = 1;
98a4179c FW	252	} else if (!strcmp(cmd, "--list-cmds")) {
	253	unsigned int i;
	254
	255	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	256	struct cmd_struct *p = commands+i;
	257	printf("%s ", p->cmd);
	258	}
ed457520	259	putchar('\n');
98a4179c	260	exit(0);
7335399a YS	261	} else if (!strcmp(cmd, "--list-opts")) {
	262	unsigned int i;
	263
	264	for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
	265	struct option *p = options+i;
	266	printf("--%s ", p->long_name);
	267	}
	268	putchar('\n');
	269	exit(0);
bbb2cea7 JO	270	} else if (!strcmp(cmd, "--debug")) {
	271	if (*argc < 2) {
	272	fprintf(stderr, "No variable specified for --debug.\n");
	273	usage(perf_usage_string);
	274	}
	275	if (perf_debug_option((*argv)[1]))
	276	usage(perf_usage_string);
	277
	278	(*argv)++;
	279	(*argc)--;
07800601 IM	280	} else {
	281	fprintf(stderr, "Unknown option: %s\n", cmd);
	282	usage(perf_usage_string);
	283	}
	284
	285	(*argv)++;
	286	(*argc)--;
	287	handled++;
	288	}
	289	return handled;
	290	}
	291
	292	static int handle_alias(int argcp, const char **argv)
	293	{
	294	int envchanged = 0, ret = 0, saved_errno = errno;
	295	int count, option_count;
4c574159	296	const char **new_argv;
07800601 IM	297	const char *alias_command;
07800601 IM	298	char *alias_string;
07800601 IM	299
	300	alias_command = (*argv)[0];
	301	alias_string = alias_lookup(alias_command);
	302	if (alias_string) {
	303	if (alias_string[0] == '!') {
	304	if (*argcp > 1) {
	305	struct strbuf buf;
	306
	307	strbuf_init(&buf, PATH_MAX);
	308	strbuf_addstr(&buf, alias_string);
	309	sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
	310	free(alias_string);
	311	alias_string = buf.buf;
	312	}
	313	ret = system(alias_string + 1);
	314	if (ret >= 0 && WIFEXITED(ret) &&
	315	WEXITSTATUS(ret) != 127)
	316	exit(WEXITSTATUS(ret));
	317	die("Failed to run '%s' when expanding alias '%s'",
	318	alias_string + 1, alias_command);
	319	}
	320	count = split_cmdline(alias_string, &new_argv);
	321	if (count < 0)
	322	die("Bad alias.%s string", alias_command);
	323	option_count = handle_options(&new_argv, &count, &envchanged);
	324	if (envchanged)
	325	die("alias '%s' changes environment variables\n"
	326	"You can use '!perf' in the alias to do this.",
	327	alias_command);
	328	memmove(new_argv - option_count, new_argv,
	329	count * sizeof(char *));
	330	new_argv -= option_count;
	331
	332	if (count < 1)
	333	die("empty alias for %s", alias_command);
	334
	335	if (!strcmp(alias_command, new_argv[0]))
	336	die("recursive alias: %s", alias_command);
	337
4c574159	338	new_argv = realloc(new_argv, sizeof(char )
07800601 IM	339	(count + *argcp + 1));
07800601 IM	340	/* insert after command name */
4c574159 TF	341	memcpy(new_argv + count, argv + 1, sizeof(char ) * *argcp);
4c574159 TF	342	new_argv[count + *argcp] = NULL;
07800601 IM	343
	344	*argv = new_argv;
	345	*argcp += count - 1;
	346
	347	ret = 1;
	348	}
	349
	350	errno = saved_errno;
	351
	352	return ret;
	353	}
	354
	355	const char perf_version_string[] = PERF_VERSION;
	356
	357	#define RUN_SETUP (1<<0)
	358	#define USE_PAGER (1<<1)
	359	/*
	360	* require working tree to be present -- anything uses this needs
	361	* RUN_SETUP for reading from the configuration file.
	362	*/
	363	#define NEED_WORK_TREE (1<<2)
	364
07800601 IM	365	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
	366	{
	367	int status;
	368	struct stat st;
	369	const char *prefix;
b2348e1d	370	char sbuf[STRERR_BUFSIZE];
07800601 IM	371
	372	prefix = NULL;
	373	if (p->option & RUN_SETUP)
	374	prefix = NULL; /* setup_perf_directory(); */
	375
5d06e691	376	if (use_browser == -1)
0020ce23	377	use_browser = check_browser_config(p->cmd);
5d06e691	378
07800601 IM	379	if (use_pager == -1 && p->option & RUN_SETUP)
	380	use_pager = check_pager_config(p->cmd);
	381	if (use_pager == -1 && p->option & USE_PAGER)
	382	use_pager = 1;
	383	commit_pager_choice();
	384
07800601	385	status = p->fn(argc, argv, prefix);
f3a1f0ea	386	exit_browser(status);
aa36ddd7	387	perf_env__exit(&perf_env);
f3a1f0ea	388
07800601 IM	389	if (status)
	390	return status & 0xff;
	391
	392	/* Somebody closed stdout? */
	393	if (fstat(fileno(stdout), &st))
	394	return 0;
	395	/* Ignore write errors for pipes and sockets.. */
	396	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	397	return 0;
	398
2a16bf8c	399	status = 1;
07800601	400	/* Check for ENOSPC and EIO errors.. */
2a16bf8c	401	if (fflush(stdout)) {
b2348e1d MH	402	fprintf(stderr, "write failure on standard output: %s",
b2348e1d MH	403	strerror_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	404	goto out;
	405	}
	406	if (ferror(stdout)) {
	407	fprintf(stderr, "unknown write failure on standard output");
	408	goto out;
	409	}
	410	if (fclose(stdout)) {
b2348e1d MH	411	fprintf(stderr, "close failed on standard output: %s",
b2348e1d MH	412	strerror_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	413	goto out;
	414	}
	415	status = 0;
	416	out:
	417	return status;
07800601 IM	418	}
	419
	420	static void handle_internal_command(int argc, const char **argv)
	421	{
	422	const char *cmd = argv[0];
f37a291c	423	unsigned int i;
07800601 IM	424	static const char ext[] = STRIP_EXTENSION;
	425
	426	if (sizeof(ext) > 1) {
	427	i = strlen(argv[0]) - strlen(ext);
	428	if (i > 0 && !strcmp(argv[0] + i, ext)) {
	429	char *argv0 = strdup(argv[0]);
	430	argv[0] = cmd = argv0;
	431	argv0[i] = '\0';
	432	}
	433	}
	434
	435	/* Turn "perf cmd --help" into "perf help cmd" */
	436	if (argc > 1 && !strcmp(argv[1], "--help")) {
	437	argv[1] = argv[0];
	438	argv[0] = cmd = "help";
	439	}
	440
	441	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	442	struct cmd_struct *p = commands+i;
	443	if (strcmp(p->cmd, cmd))
	444	continue;
	445	exit(run_builtin(p, argc, argv));
	446	}
	447	}
	448
	449	static void execv_dashed_external(const char **argv)
	450	{
	451	struct strbuf cmd = STRBUF_INIT;
	452	const char *tmp;
	453	int status;
	454
	455	strbuf_addf(&cmd, "perf-%s", argv[0]);
	456
	457	/*
	458	* argv[0] must be the perf command, but the argv array
	459	* belongs to the caller, and may be reused in
	460	* subsequent loop iterations. Save argv[0] and
	461	* restore it on error.
	462	*/
	463	tmp = argv[0];
	464	argv[0] = cmd.buf;
	465
	466	/*
	467	* if we fail because the command is not found, it is
	468	* OK to return. Otherwise, we just pass along the status code.
	469	*/
	470	status = run_command_v_opt(argv, 0);
	471	if (status != -ERR_RUN_COMMAND_EXEC) {
	472	if (IS_RUN_COMMAND_ERR(status))
	473	die("unable to run '%s'", argv[0]);
	474	exit(-status);
	475	}
	476	errno = ENOENT; /* as if we called execvp */
	477
	478	argv[0] = tmp;
	479
	480	strbuf_release(&cmd);
	481	}
	482
	483	static int run_argv(int argcp, const char **argv)
	484	{
	485	int done_alias = 0;
	486
	487	while (1) {
488	/* See if it's an internal command */
489	handle_internal_command(argcp, argv);
490
491	/* .. then try the external ones */
492	execv_dashed_external(*argv);
493
494	/* It could be an alias -- this works around the insanity
495	* of overriding "perf log" with "perf show" by having
496	* alias.log = show
497	*/
498	if (done_alias \|\| !handle_alias(argcp, argv))
499	break;
500	done_alias = 1;
501	}
502
503	return done_alias;
504	}
505
3af6e338 ACM	506	static void pthread__block_sigwinch(void)
	507	{
	508	sigset_t set;
	509
	510	sigemptyset(&set);
	511	sigaddset(&set, SIGWINCH);
	512	pthread_sigmask(SIG_BLOCK, &set, NULL);
	513	}
	514
	515	void pthread__unblock_sigwinch(void)
	516	{
	517	sigset_t set;
	518
	519	sigemptyset(&set);
	520	sigaddset(&set, SIGWINCH);
	521	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
	522	}
	523
07800601 IM	524	int main(int argc, const char **argv)
	525	{
	526	const char *cmd;
b2348e1d	527	char sbuf[STRERR_BUFSIZE];
07800601	528
918512b4	529	/* The page_size is placed in util object. */
0c1fe6b2	530	page_size = sysconf(_SC_PAGE_SIZE);
2b1b7100	531	cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
0c1fe6b2	532
07800601 IM	533	cmd = perf_extract_argv0_path(argv[0]);
	534	if (!cmd)
	535	cmd = "perf-help";
65d4b265 JO	536
	537	/* get debugfs/tracefs mount point from /proc/mounts */
	538	tracing_path_mount();
	539
07800601 IM	540	/*
	541	* "perf-xxxx" is the same as "perf xxxx", but we obviously:
	542	*
	543	* - cannot take flags in between the "perf" and the "xxxx".
	544	* - cannot execute it externally (since it would just do
	545	* the same thing over again)
	546	*
	547	* So we just directly call the internal command handler, and
	548	* die if that one cannot handle it.
	549	*/
	550	if (!prefixcmp(cmd, "perf-")) {
266dfb0b	551	cmd += 5;
07800601 IM	552	argv[0] = cmd;
07800601 IM	553	handle_internal_command(argc, argv);
2a16bf8c ACM	554	fprintf(stderr, "cannot handle %s internally", cmd);
2a16bf8c ACM	555	goto out;
07800601	556	}
b52bc234	557	if (!prefixcmp(cmd, "trace")) {
1b572622	558	#ifdef HAVE_LIBAUDIT_SUPPORT
99ce8e9f	559	set_buildid_dir(NULL);
b52bc234 ACM	560	setup_path();
	561	argv[0] = "trace";
	562	return cmd_trace(argc, argv, NULL);
1b572622 ACM	563	#else
	564	fprintf(stderr,
	565	"trace command not available: missing audit-libs devel package at build time.\n");
	566	goto out;
b52bc234	567	#endif
1b572622	568	}
07800601 IM	569	/* Look for flags.. */
	570	argv++;
	571	argc--;
	572	handle_options(&argv, &argc, NULL);
	573	commit_pager_choice();
99ce8e9f	574	set_buildid_dir(NULL);
45de34bb	575
07800601 IM	576	if (argc > 0) {
	577	if (!prefixcmp(argv[0], "--"))
	578	argv[0] += 2;
	579	} else {
	580	/* The user didn't specify a command; give them help */
502fc5c7	581	printf("\n usage: %s\n\n", perf_usage_string);
07800601	582	list_common_cmds_help();
502fc5c7	583	printf("\n %s\n\n", perf_more_info_string);
2a16bf8c	584	goto out;
07800601 IM	585	}
	586	cmd = argv[0];
	587
52502bf2 JO	588	test_attr__init();
52502bf2 JO	589
07800601 IM	590	/*
07800601 IM	591	* We use PATH to find perf commands, but we prepend some higher
659431fc	592	* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
07800601 IM	593	* environment, and the $(perfexecdir) from the Makefile at build
	594	* time.
	595	*/
	596	setup_path();
3af6e338 ACM	597	/*
	598	* Block SIGWINCH notifications so that the thread that wants it can
	599	* unblock and get syscalls like select interrupted instead of waiting
	600	* forever while the signal goes to some other non interested thread.
	601	*/
	602	pthread__block_sigwinch();
07800601 IM	603
07800601 IM	604	while (1) {
4c574159	605	static int done_help;
b5ded713	606	int was_alias = run_argv(&argc, &argv);
8035e428	607
07800601 IM	608	if (errno != ENOENT)
07800601 IM	609	break;
8035e428	610
07800601 IM	611	if (was_alias) {
	612	fprintf(stderr, "Expansion of alias '%s' failed; "
	613	"'%s' is not a perf-command\n",
	614	cmd, argv[0]);
2a16bf8c	615	goto out;
07800601 IM	616	}
	617	if (!done_help) {
	618	cmd = argv[0] = help_unknown_cmd(cmd);
	619	done_help = 1;
	620	} else
	621	break;
	622	}
	623
	624	fprintf(stderr, "Failed to run command '%s': %s\n",
b2348e1d	625	cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c	626	out:
07800601 IM	627	return 1;
07800601 IM	628	}