[mirror_ubuntu-bionic-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 <subcmd/exec-cmd.h>
#include "util/config.h"
#include "util/quote.h"
#include <subcmd/run-command.h>
#include "util/parse-events.h"
#include <subcmd/parse-options.h>
#include "util/bpf-loader.h"
#include "util/debug.h"
#include <api/fs/fs.h>
#include <api/fs/tracing_path.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <time.h>
#include <linux/kernel.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.";

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

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

static struct cmd_struct commands[] = {
	{ "buildid-cache", cmd_buildid_cache, 0 },
	{ "buildid-list", cmd_buildid_list, 0 },
	{ "config",	cmd_config,	0 },
	{ "c2c",	cmd_c2c,	0 },
	{ "diff",	cmd_diff,	0 },
	{ "evlist",	cmd_evlist,	0 },
	{ "help",	cmd_help,	0 },
	{ "kallsyms",	cmd_kallsyms,	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 },
	{ "ftrace",	cmd_ftrace,	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)
{
	int err;
	struct pager_config c;
	c.cmd = cmd;
	c.val = -1;
	err = perf_config(pager_command_config, &c);
	return err ?: 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)
{
	int err;
	struct pager_config c;
	c.cmd = cmd;
	c.val = -1;
	err = perf_config(browser_command_config, &c);
	return err ?: c.val;
}

static void commit_pager_choice(void)
{
	switch (use_pager) {
	case 0:
		setenv(PERF_PAGER_ENVIRONMENT, "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("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 == '=')
				set_argv_exec_path(cmd + 1);
			else {
				puts(get_argv_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, "--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;
}

#define RUN_SETUP	(1<<0)
#define USE_PAGER	(1<<1)

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

	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();

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

	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",
			str_error_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",
			str_error_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;

	/* 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)
{
	char *cmd;
	const char *tmp;
	int status;

	if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
		goto do_die;

	/*
	 * 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;

	/*
	 * 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)) {
do_die:
			pr_err("FATAL: unable to run '%s'", argv[0]);
			status = -128;
		}
		exit(-status);
	}
	errno = ENOENT; /* as if we called execvp */

	argv[0] = tmp;
	zfree(&cmd);
}

static int run_argv(int *argcp, const char ***argv)
{
	/* See if it's an internal command */
	handle_internal_command(*argcp, *argv);

	/* .. then try the external ones */
	execv_dashed_external(*argv);
	return 0;
}

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);
}

#ifdef _SC_LEVEL1_DCACHE_LINESIZE
#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
#else
static void cache_line_size(int *cacheline_sizep)
{
	if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
		pr_debug("cannot determine cache line size");
}
#endif

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

	/* libsubcmd init */
	exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
	pager_init(PERF_PAGER_ENVIRONMENT);

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

	if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
		sysctl_perf_event_max_stack = value;

	if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
		sysctl_perf_event_max_contexts_per_stack = value;

	cmd = extract_argv0_path(argv[0]);
	if (!cmd)
		cmd = "perf-help";

	srandom(time(NULL));

	perf_config__init();
	err = perf_config(perf_default_config, NULL);
	if (err)
		return err;
	set_buildid_dir(NULL);

	/* 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
		setup_path();
		argv[0] = "trace";
		return cmd_trace(argc, argv);
#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();

	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();

	perf_debug_setup();

	while (1) {
		static int done_help;

		run_argv(&argc, &argv);

		if (errno != ENOENT)
			break;

		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, str_error_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"
4b6ab94e	12	#include <subcmd/exec-cmd.h>
41840d21	13	#include "util/config.h"
148be2c1	14	#include "util/quote.h"
4b6ab94e	15	#include <subcmd/run-command.h>
5beeded1	16	#include "util/parse-events.h"
4b6ab94e	17	#include <subcmd/parse-options.h>
84c86ca1	18	#include "util/bpf-loader.h"
bbb2cea7	19	#include "util/debug.h"
4cb93446	20	#include <api/fs/fs.h>
592d5a6b	21	#include <api/fs/tracing_path.h>
a43783ae	22	#include <errno.h>
27683dc5	23	#include <pthread.h>
9607ad3a	24	#include <signal.h>
14cbfbeb NK	25	#include <stdlib.h>
14cbfbeb NK	26	#include <time.h>
877a7a11	27	#include <linux/kernel.h>
07800601 IM	28
07800601 IM	29	const char perf_usage_string[] =
78a1b503	30	"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
07800601 IM	31
	32	const char perf_more_info_string[] =
	33	"See 'perf help COMMAND' for more information on a specific command.";
	34
	35	static int use_pager = -1;
70cb4e96	36	const char *input_name;
5d06e691	37
98a4179c FW	38	struct cmd_struct {
98a4179c FW	39	const char *cmd;
b0ad8ea6	40	int (fn)(int, const char *);
98a4179c FW	41	int option;
	42	};
	43
	44	static struct cmd_struct commands[] = {
	45	{ "buildid-cache", cmd_buildid_cache, 0 },
	46	{ "buildid-list", cmd_buildid_list, 0 },
30862f2c	47	{ "config", cmd_config, 0 },
7aef3bf3	48	{ "c2c", cmd_c2c, 0 },
98a4179c FW	49	{ "diff", cmd_diff, 0 },
	50	{ "evlist", cmd_evlist, 0 },
	51	{ "help", cmd_help, 0 },
35563771	52	{ "kallsyms", cmd_kallsyms, 0 },
98a4179c FW	53	{ "list", cmd_list, 0 },
	54	{ "record", cmd_record, 0 },
	55	{ "report", cmd_report, 0 },
	56	{ "bench", cmd_bench, 0 },
	57	{ "stat", cmd_stat, 0 },
	58	{ "timechart", cmd_timechart, 0 },
	59	{ "top", cmd_top, 0 },
	60	{ "annotate", cmd_annotate, 0 },
	61	{ "version", cmd_version, 0 },
	62	{ "script", cmd_script, 0 },
	63	{ "sched", cmd_sched, 0 },
89fe808a	64	#ifdef HAVE_LIBELF_SUPPORT
98a4179c	65	{ "probe", cmd_probe, 0 },
393be2e3	66	#endif
98a4179c FW	67	{ "kmem", cmd_kmem, 0 },
	68	{ "lock", cmd_lock, 0 },
	69	{ "kvm", cmd_kvm, 0 },
	70	{ "test", cmd_test, 0 },
89fe808a	71	#ifdef HAVE_LIBAUDIT_SUPPORT
514f1c67	72	{ "trace", cmd_trace, 0 },
4d29089c	73	#endif
98a4179c	74	{ "inject", cmd_inject, 0 },
028f12ee	75	{ "mem", cmd_mem, 0 },
2245bf14	76	{ "data", cmd_data, 0 },
d01f4e8d	77	{ "ftrace", cmd_ftrace, 0 },
98a4179c FW	78	};
98a4179c FW	79
07800601 IM	80	struct pager_config {
	81	const char *cmd;
	82	int val;
	83	};
	84
	85	static int pager_command_config(const char var, const char value, void *data)
	86	{
	87	struct pager_config *c = data;
	88	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	89	c->val = perf_config_bool(var, value);
	90	return 0;
	91	}
	92
	93	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	94	int check_pager_config(const char *cmd)
	95	{
ecc4c561	96	int err;
07800601 IM	97	struct pager_config c;
	98	c.cmd = cmd;
	99	c.val = -1;
ecc4c561 ACM	100	err = perf_config(pager_command_config, &c);
ecc4c561 ACM	101	return err ?: c.val;
07800601 IM	102	}
07800601 IM	103
0020ce23	104	static int browser_command_config(const char var, const char value, void *data)
5d06e691 ACM	105	{
	106	struct pager_config *c = data;
	107	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
	108	c->val = perf_config_bool(var, value);
0020ce23 NK	109	if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
0020ce23 NK	110	c->val = perf_config_bool(var, value) ? 2 : 0;
5d06e691 ACM	111	return 0;
	112	}
	113
0020ce23 NK	114	/*
	115	* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
	116	* and -1 for "not specified"
	117	*/
	118	static int check_browser_config(const char *cmd)
5d06e691	119	{
ecc4c561	120	int err;
5d06e691 ACM	121	struct pager_config c;
	122	c.cmd = cmd;
	123	c.val = -1;
ecc4c561 ACM	124	err = perf_config(browser_command_config, &c);
ecc4c561 ACM	125	return err ?: c.val;
5d06e691 ACM	126	}
5d06e691 ACM	127
4c574159 TF	128	static void commit_pager_choice(void)
4c574159 TF	129	{
07800601 IM	130	switch (use_pager) {
07800601 IM	131	case 0:
096d3558	132	setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
07800601 IM	133	break;
	134	case 1:
	135	/* setup_pager(); */
	136	break;
	137	default:
	138	break;
	139	}
	140	}
	141
7335399a YS	142	struct option options[] = {
	143	OPT_ARGUMENT("help", "help"),
	144	OPT_ARGUMENT("version", "version"),
	145	OPT_ARGUMENT("exec-path", "exec-path"),
	146	OPT_ARGUMENT("html-path", "html-path"),
	147	OPT_ARGUMENT("paginate", "paginate"),
	148	OPT_ARGUMENT("no-pager", "no-pager"),
7335399a YS	149	OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
	150	OPT_ARGUMENT("buildid-dir", "buildid-dir"),
	151	OPT_ARGUMENT("list-cmds", "list-cmds"),
	152	OPT_ARGUMENT("list-opts", "list-opts"),
	153	OPT_ARGUMENT("debug", "debug"),
	154	OPT_END()
	155	};
	156
4c574159	157	static int handle_options(const char **argv, int argc, int *envchanged)
07800601 IM	158	{
	159	int handled = 0;
	160
	161	while (*argc > 0) {
	162	const char cmd = (argv)[0];
	163	if (cmd[0] != '-')
	164	break;
	165
	166	/*
	167	* For legacy reasons, the "version" and "help"
	168	* commands can be written with "--" prepended
	169	* to make them look like flags.
	170	*/
	171	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	172	break;
	173
a1853e2c JO	174	/*
	175	* Shortcut for '-h' and '-v' options to invoke help
	176	* and version command.
	177	*/
	178	if (!strcmp(cmd, "-h")) {
	179	(*argv)[0] = "--help";
	180	break;
	181	}
	182
	183	if (!strcmp(cmd, "-v")) {
	184	(*argv)[0] = "--version";
	185	break;
	186	}
	187
07800601 IM	188	/*
	189	* Check remaining flags.
	190	*/
cfed95a6 VL	191	if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
cfed95a6 VL	192	cmd += strlen(CMD_EXEC_PATH);
07800601	193	if (*cmd == '=')
46113a54	194	set_argv_exec_path(cmd + 1);
07800601	195	else {
46113a54	196	puts(get_argv_exec_path());
07800601 IM	197	exit(0);
	198	}
	199	} else if (!strcmp(cmd, "--html-path")) {
	200	puts(system_path(PERF_HTML_PATH));
	201	exit(0);
	202	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
	203	use_pager = 1;
	204	} else if (!strcmp(cmd, "--no-pager")) {
	205	use_pager = 0;
	206	if (envchanged)
	207	*envchanged = 1;
5beeded1 JB	208	} else if (!strcmp(cmd, "--debugfs-dir")) {
	209	if (*argc < 2) {
	210	fprintf(stderr, "No directory given for --debugfs-dir.\n");
	211	usage(perf_usage_string);
	212	}
65d4b265	213	tracing_path_set((*argv)[1]);
5beeded1 JB	214	if (envchanged)
	215	*envchanged = 1;
	216	(*argv)++;
	217	(*argc)--;
99ce8e9f JO	218	} else if (!strcmp(cmd, "--buildid-dir")) {
	219	if (*argc < 2) {
	220	fprintf(stderr, "No directory given for --buildid-dir.\n");
	221	usage(perf_usage_string);
	222	}
	223	set_buildid_dir((*argv)[1]);
	224	if (envchanged)
	225	*envchanged = 1;
	226	(*argv)++;
	227	(*argc)--;
cfed95a6	228	} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
65d4b265	229	tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
9f30fffc	230	fprintf(stderr, "dir: %s\n", tracing_path);
5beeded1 JB	231	if (envchanged)
5beeded1 JB	232	*envchanged = 1;
98a4179c FW	233	} else if (!strcmp(cmd, "--list-cmds")) {
	234	unsigned int i;
	235
	236	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	237	struct cmd_struct *p = commands+i;
	238	printf("%s ", p->cmd);
	239	}
ed457520	240	putchar('\n');
98a4179c	241	exit(0);
7335399a YS	242	} else if (!strcmp(cmd, "--list-opts")) {
	243	unsigned int i;
	244
	245	for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
	246	struct option *p = options+i;
	247	printf("--%s ", p->long_name);
	248	}
	249	putchar('\n');
	250	exit(0);
bbb2cea7 JO	251	} else if (!strcmp(cmd, "--debug")) {
	252	if (*argc < 2) {
	253	fprintf(stderr, "No variable specified for --debug.\n");
	254	usage(perf_usage_string);
	255	}
	256	if (perf_debug_option((*argv)[1]))
	257	usage(perf_usage_string);
	258
	259	(*argv)++;
	260	(*argc)--;
07800601 IM	261	} else {
	262	fprintf(stderr, "Unknown option: %s\n", cmd);
	263	usage(perf_usage_string);
	264	}
	265
	266	(*argv)++;
	267	(*argc)--;
	268	handled++;
	269	}
	270	return handled;
	271	}
	272
07800601 IM	273	#define RUN_SETUP (1<<0)
07800601 IM	274	#define USE_PAGER (1<<1)
07800601	275
07800601 IM	276	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
	277	{
	278	int status;
	279	struct stat st;
b2348e1d	280	char sbuf[STRERR_BUFSIZE];
07800601	281
5d06e691	282	if (use_browser == -1)
0020ce23	283	use_browser = check_browser_config(p->cmd);
5d06e691	284
07800601 IM	285	if (use_pager == -1 && p->option & RUN_SETUP)
	286	use_pager = check_pager_config(p->cmd);
	287	if (use_pager == -1 && p->option & USE_PAGER)
	288	use_pager = 1;
	289	commit_pager_choice();
	290
2bdb2c27	291	perf_env__set_cmdline(&perf_env, argc, argv);
b0ad8ea6	292	status = p->fn(argc, argv);
8a0a9c7e	293	perf_config__exit();
f3a1f0ea	294	exit_browser(status);
aa36ddd7	295	perf_env__exit(&perf_env);
84c86ca1	296	bpf__clear();
f3a1f0ea	297
07800601 IM	298	if (status)
	299	return status & 0xff;
	300
	301	/* Somebody closed stdout? */
	302	if (fstat(fileno(stdout), &st))
	303	return 0;
	304	/* Ignore write errors for pipes and sockets.. */
	305	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	306	return 0;
	307
2a16bf8c	308	status = 1;
07800601	309	/* Check for ENOSPC and EIO errors.. */
2a16bf8c	310	if (fflush(stdout)) {
b2348e1d	311	fprintf(stderr, "write failure on standard output: %s",
c8b5f2c9	312	str_error_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	313	goto out;
	314	}
	315	if (ferror(stdout)) {
	316	fprintf(stderr, "unknown write failure on standard output");
	317	goto out;
	318	}
	319	if (fclose(stdout)) {
b2348e1d	320	fprintf(stderr, "close failed on standard output: %s",
c8b5f2c9	321	str_error_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	322	goto out;
	323	}
	324	status = 0;
	325	out:
	326	return status;
07800601 IM	327	}
	328
	329	static void handle_internal_command(int argc, const char **argv)
	330	{
	331	const char *cmd = argv[0];
f37a291c	332	unsigned int i;
07800601 IM	333
	334	/* Turn "perf cmd --help" into "perf help cmd" */
	335	if (argc > 1 && !strcmp(argv[1], "--help")) {
	336	argv[1] = argv[0];
	337	argv[0] = cmd = "help";
	338	}
	339
	340	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	341	struct cmd_struct *p = commands+i;
	342	if (strcmp(p->cmd, cmd))
	343	continue;
	344	exit(run_builtin(p, argc, argv));
	345	}
	346	}
	347
	348	static void execv_dashed_external(const char **argv)
	349	{
5104ffb2	350	char *cmd;
07800601 IM	351	const char *tmp;
	352	int status;
	353
5104ffb2 ACM	354	if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
5104ffb2 ACM	355	goto do_die;
07800601 IM	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];
5104ffb2	364	argv[0] = cmd;
07800601 IM	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) {
5104ffb2 ACM	372	if (IS_RUN_COMMAND_ERR(status)) {
5104ffb2 ACM	373	do_die:
42774806 ACM	374	pr_err("FATAL: unable to run '%s'", argv[0]);
42774806 ACM	375	status = -128;
5104ffb2	376	}
07800601 IM	377	exit(-status);
	378	}
	379	errno = ENOENT; /* as if we called execvp */
	380
	381	argv[0] = tmp;
5104ffb2	382	zfree(&cmd);
07800601 IM	383	}
	384
	385	static int run_argv(int argcp, const char **argv)
	386	{
c6867701 ACM	387	/* See if it's an internal command */
c6867701 ACM	388	handle_internal_command(argcp, argv);
07800601	389
c6867701 ACM	390	/* .. then try the external ones */
	391	execv_dashed_external(*argv);
	392	return 0;
07800601 IM	393	}
07800601 IM	394
3af6e338 ACM	395	static void pthread__block_sigwinch(void)
	396	{
	397	sigset_t set;
	398
	399	sigemptyset(&set);
	400	sigaddset(&set, SIGWINCH);
	401	pthread_sigmask(SIG_BLOCK, &set, NULL);
	402	}
	403
	404	void pthread__unblock_sigwinch(void)
	405	{
	406	sigset_t set;
	407
	408	sigemptyset(&set);
	409	sigaddset(&set, SIGWINCH);
	410	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
	411	}
	412
9a3dc28b ACM	413	#ifdef _SC_LEVEL1_DCACHE_LINESIZE
	414	#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
	415	#else
	416	static void cache_line_size(int *cacheline_sizep)
	417	{
	418	if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
8811e8ea	419	pr_debug("cannot determine cache line size");
9a3dc28b ACM	420	}
	421	#endif
	422
07800601 IM	423	int main(int argc, const char **argv)
07800601 IM	424	{
ecc4c561	425	int err;
07800601	426	const char *cmd;
b2348e1d	427	char sbuf[STRERR_BUFSIZE];
4cb93446	428	int value;
07800601	429
096d3558 JP	430	/* libsubcmd init */
	431	exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
	432	pager_init(PERF_PAGER_ENVIRONMENT);
	433
918512b4	434	/* The page_size is placed in util object. */
0c1fe6b2	435	page_size = sysconf(_SC_PAGE_SIZE);
9a3dc28b	436	cache_line_size(&cacheline_size);
0c1fe6b2	437
4cb93446 ACM	438	if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
	439	sysctl_perf_event_max_stack = value;
	440
a29d5c9b ACM	441	if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
	442	sysctl_perf_event_max_contexts_per_stack = value;
	443
46113a54	444	cmd = extract_argv0_path(argv[0]);
07800601 IM	445	if (!cmd)
07800601 IM	446	cmd = "perf-help";
65d4b265	447
14cbfbeb NK	448	srandom(time(NULL));
14cbfbeb NK	449
8a0a9c7e	450	perf_config__init();
ecc4c561 ACM	451	err = perf_config(perf_default_config, NULL);
	452	if (err)
	453	return err;
58cb9d65	454	set_buildid_dir(NULL);
b8cbb349	455
65d4b265 JO	456	/* get debugfs/tracefs mount point from /proc/mounts */
	457	tracing_path_mount();
	458
07800601 IM	459	/*
	460	* "perf-xxxx" is the same as "perf xxxx", but we obviously:
	461	*
	462	* - cannot take flags in between the "perf" and the "xxxx".
	463	* - cannot execute it externally (since it would just do
	464	* the same thing over again)
	465	*
	466	* So we just directly call the internal command handler, and
	467	* die if that one cannot handle it.
	468	*/
	469	if (!prefixcmp(cmd, "perf-")) {
266dfb0b	470	cmd += 5;
07800601 IM	471	argv[0] = cmd;
07800601 IM	472	handle_internal_command(argc, argv);
2a16bf8c ACM	473	fprintf(stderr, "cannot handle %s internally", cmd);
2a16bf8c ACM	474	goto out;
07800601	475	}
b52bc234	476	if (!prefixcmp(cmd, "trace")) {
1b572622	477	#ifdef HAVE_LIBAUDIT_SUPPORT
b52bc234 ACM	478	setup_path();
b52bc234 ACM	479	argv[0] = "trace";
b0ad8ea6	480	return cmd_trace(argc, argv);
1b572622 ACM	481	#else
	482	fprintf(stderr,
	483	"trace command not available: missing audit-libs devel package at build time.\n");
	484	goto out;
b52bc234	485	#endif
1b572622	486	}
07800601 IM	487	/* Look for flags.. */
	488	argv++;
	489	argc--;
	490	handle_options(&argv, &argc, NULL);
	491	commit_pager_choice();
45de34bb	492
07800601 IM	493	if (argc > 0) {
	494	if (!prefixcmp(argv[0], "--"))
	495	argv[0] += 2;
	496	} else {
	497	/* The user didn't specify a command; give them help */
502fc5c7	498	printf("\n usage: %s\n\n", perf_usage_string);
07800601	499	list_common_cmds_help();
502fc5c7	500	printf("\n %s\n\n", perf_more_info_string);
2a16bf8c	501	goto out;
07800601 IM	502	}
	503	cmd = argv[0];
	504
52502bf2 JO	505	test_attr__init();
52502bf2 JO	506
07800601 IM	507	/*
07800601 IM	508	* We use PATH to find perf commands, but we prepend some higher
659431fc	509	* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
07800601 IM	510	* environment, and the $(perfexecdir) from the Makefile at build
	511	* time.
	512	*/
	513	setup_path();
3af6e338 ACM	514	/*
	515	* Block SIGWINCH notifications so that the thread that wants it can
	516	* unblock and get syscalls like select interrupted instead of waiting
	517	* forever while the signal goes to some other non interested thread.
	518	*/
	519	pthread__block_sigwinch();
07800601	520
dd629cc0 JO	521	perf_debug_setup();
dd629cc0 JO	522
07800601	523	while (1) {
4c574159	524	static int done_help;
c6867701 ACM	525
c6867701 ACM	526	run_argv(&argc, &argv);
8035e428	527
07800601 IM	528	if (errno != ENOENT)
07800601 IM	529	break;
8035e428	530
07800601 IM	531	if (!done_help) {
	532	cmd = argv[0] = help_unknown_cmd(cmd);
	533	done_help = 1;
	534	} else
	535	break;
	536	}
	537
	538	fprintf(stderr, "Failed to run command '%s': %s\n",
c8b5f2c9	539	cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c	540	out:
07800601 IM	541	return 1;
07800601 IM	542	}