[mirror_ubuntu-artful-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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.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" */
static 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>
7a8ef4c4 ACM	27	#include <sys/types.h>
	28	#include <sys/stat.h>
	29	#include <unistd.h>
877a7a11	30	#include <linux/kernel.h>
07800601 IM	31
07800601 IM	32	const char perf_usage_string[] =
78a1b503	33	"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
07800601 IM	34
	35	const char perf_more_info_string[] =
	36	"See 'perf help COMMAND' for more information on a specific command.";
	37
	38	static int use_pager = -1;
70cb4e96	39	const char *input_name;
5d06e691	40
98a4179c FW	41	struct cmd_struct {
98a4179c FW	42	const char *cmd;
b0ad8ea6	43	int (fn)(int, const char *);
98a4179c FW	44	int option;
	45	};
	46
	47	static struct cmd_struct commands[] = {
	48	{ "buildid-cache", cmd_buildid_cache, 0 },
	49	{ "buildid-list", cmd_buildid_list, 0 },
30862f2c	50	{ "config", cmd_config, 0 },
7aef3bf3	51	{ "c2c", cmd_c2c, 0 },
98a4179c FW	52	{ "diff", cmd_diff, 0 },
	53	{ "evlist", cmd_evlist, 0 },
	54	{ "help", cmd_help, 0 },
35563771	55	{ "kallsyms", cmd_kallsyms, 0 },
98a4179c FW	56	{ "list", cmd_list, 0 },
	57	{ "record", cmd_record, 0 },
	58	{ "report", cmd_report, 0 },
	59	{ "bench", cmd_bench, 0 },
	60	{ "stat", cmd_stat, 0 },
	61	{ "timechart", cmd_timechart, 0 },
	62	{ "top", cmd_top, 0 },
	63	{ "annotate", cmd_annotate, 0 },
	64	{ "version", cmd_version, 0 },
	65	{ "script", cmd_script, 0 },
	66	{ "sched", cmd_sched, 0 },
89fe808a	67	#ifdef HAVE_LIBELF_SUPPORT
98a4179c	68	{ "probe", cmd_probe, 0 },
393be2e3	69	#endif
98a4179c FW	70	{ "kmem", cmd_kmem, 0 },
	71	{ "lock", cmd_lock, 0 },
	72	{ "kvm", cmd_kvm, 0 },
	73	{ "test", cmd_test, 0 },
89fe808a	74	#ifdef HAVE_LIBAUDIT_SUPPORT
514f1c67	75	{ "trace", cmd_trace, 0 },
4d29089c	76	#endif
98a4179c	77	{ "inject", cmd_inject, 0 },
028f12ee	78	{ "mem", cmd_mem, 0 },
2245bf14	79	{ "data", cmd_data, 0 },
d01f4e8d	80	{ "ftrace", cmd_ftrace, 0 },
98a4179c FW	81	};
98a4179c FW	82
07800601 IM	83	struct pager_config {
	84	const char *cmd;
	85	int val;
	86	};
	87
	88	static int pager_command_config(const char var, const char value, void *data)
	89	{
	90	struct pager_config *c = data;
	91	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	92	c->val = perf_config_bool(var, value);
	93	return 0;
	94	}
	95
	96	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
a3b70b3b	97	static int check_pager_config(const char *cmd)
07800601	98	{
ecc4c561	99	int err;
07800601 IM	100	struct pager_config c;
	101	c.cmd = cmd;
	102	c.val = -1;
ecc4c561 ACM	103	err = perf_config(pager_command_config, &c);
ecc4c561 ACM	104	return err ?: c.val;
07800601 IM	105	}
07800601 IM	106
0020ce23	107	static int browser_command_config(const char var, const char value, void *data)
5d06e691 ACM	108	{
	109	struct pager_config *c = data;
	110	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
	111	c->val = perf_config_bool(var, value);
0020ce23 NK	112	if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
0020ce23 NK	113	c->val = perf_config_bool(var, value) ? 2 : 0;
5d06e691 ACM	114	return 0;
	115	}
	116
0020ce23 NK	117	/*
	118	* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
	119	* and -1 for "not specified"
	120	*/
	121	static int check_browser_config(const char *cmd)
5d06e691	122	{
ecc4c561	123	int err;
5d06e691 ACM	124	struct pager_config c;
	125	c.cmd = cmd;
	126	c.val = -1;
ecc4c561 ACM	127	err = perf_config(browser_command_config, &c);
ecc4c561 ACM	128	return err ?: c.val;
5d06e691 ACM	129	}
5d06e691 ACM	130
4c574159 TF	131	static void commit_pager_choice(void)
4c574159 TF	132	{
07800601 IM	133	switch (use_pager) {
07800601 IM	134	case 0:
096d3558	135	setenv(PERF_PAGER_ENVIRONMENT, "cat", 1);
07800601 IM	136	break;
	137	case 1:
	138	/* setup_pager(); */
	139	break;
	140	default:
	141	break;
	142	}
	143	}
	144
7335399a YS	145	struct option options[] = {
	146	OPT_ARGUMENT("help", "help"),
	147	OPT_ARGUMENT("version", "version"),
	148	OPT_ARGUMENT("exec-path", "exec-path"),
	149	OPT_ARGUMENT("html-path", "html-path"),
	150	OPT_ARGUMENT("paginate", "paginate"),
	151	OPT_ARGUMENT("no-pager", "no-pager"),
7335399a YS	152	OPT_ARGUMENT("debugfs-dir", "debugfs-dir"),
	153	OPT_ARGUMENT("buildid-dir", "buildid-dir"),
	154	OPT_ARGUMENT("list-cmds", "list-cmds"),
	155	OPT_ARGUMENT("list-opts", "list-opts"),
	156	OPT_ARGUMENT("debug", "debug"),
	157	OPT_END()
	158	};
	159
4c574159	160	static int handle_options(const char **argv, int argc, int *envchanged)
07800601 IM	161	{
	162	int handled = 0;
	163
	164	while (*argc > 0) {
	165	const char cmd = (argv)[0];
	166	if (cmd[0] != '-')
	167	break;
	168
	169	/*
	170	* For legacy reasons, the "version" and "help"
	171	* commands can be written with "--" prepended
	172	* to make them look like flags.
	173	*/
	174	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	175	break;
	176
a1853e2c JO	177	/*
	178	* Shortcut for '-h' and '-v' options to invoke help
	179	* and version command.
	180	*/
	181	if (!strcmp(cmd, "-h")) {
	182	(*argv)[0] = "--help";
	183	break;
	184	}
	185
	186	if (!strcmp(cmd, "-v")) {
	187	(*argv)[0] = "--version";
	188	break;
	189	}
	190
07800601 IM	191	/*
	192	* Check remaining flags.
	193	*/
cfed95a6 VL	194	if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
cfed95a6 VL	195	cmd += strlen(CMD_EXEC_PATH);
07800601	196	if (*cmd == '=')
46113a54	197	set_argv_exec_path(cmd + 1);
07800601	198	else {
46113a54	199	puts(get_argv_exec_path());
07800601 IM	200	exit(0);
	201	}
	202	} else if (!strcmp(cmd, "--html-path")) {
	203	puts(system_path(PERF_HTML_PATH));
	204	exit(0);
	205	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
	206	use_pager = 1;
	207	} else if (!strcmp(cmd, "--no-pager")) {
	208	use_pager = 0;
	209	if (envchanged)
	210	*envchanged = 1;
5beeded1 JB	211	} else if (!strcmp(cmd, "--debugfs-dir")) {
	212	if (*argc < 2) {
	213	fprintf(stderr, "No directory given for --debugfs-dir.\n");
	214	usage(perf_usage_string);
	215	}
65d4b265	216	tracing_path_set((*argv)[1]);
5beeded1 JB	217	if (envchanged)
	218	*envchanged = 1;
	219	(*argv)++;
	220	(*argc)--;
99ce8e9f JO	221	} else if (!strcmp(cmd, "--buildid-dir")) {
	222	if (*argc < 2) {
	223	fprintf(stderr, "No directory given for --buildid-dir.\n");
	224	usage(perf_usage_string);
	225	}
	226	set_buildid_dir((*argv)[1]);
	227	if (envchanged)
	228	*envchanged = 1;
	229	(*argv)++;
	230	(*argc)--;
cfed95a6	231	} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
65d4b265	232	tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
9f30fffc	233	fprintf(stderr, "dir: %s\n", tracing_path);
5beeded1 JB	234	if (envchanged)
5beeded1 JB	235	*envchanged = 1;
98a4179c FW	236	} else if (!strcmp(cmd, "--list-cmds")) {
	237	unsigned int i;
	238
	239	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	240	struct cmd_struct *p = commands+i;
	241	printf("%s ", p->cmd);
	242	}
ed457520	243	putchar('\n');
98a4179c	244	exit(0);
7335399a YS	245	} else if (!strcmp(cmd, "--list-opts")) {
	246	unsigned int i;
	247
	248	for (i = 0; i < ARRAY_SIZE(options)-1; i++) {
	249	struct option *p = options+i;
	250	printf("--%s ", p->long_name);
	251	}
	252	putchar('\n');
	253	exit(0);
bbb2cea7 JO	254	} else if (!strcmp(cmd, "--debug")) {
	255	if (*argc < 2) {
	256	fprintf(stderr, "No variable specified for --debug.\n");
	257	usage(perf_usage_string);
	258	}
	259	if (perf_debug_option((*argv)[1]))
	260	usage(perf_usage_string);
	261
	262	(*argv)++;
	263	(*argc)--;
07800601 IM	264	} else {
	265	fprintf(stderr, "Unknown option: %s\n", cmd);
	266	usage(perf_usage_string);
	267	}
	268
	269	(*argv)++;
	270	(*argc)--;
	271	handled++;
	272	}
	273	return handled;
	274	}
	275
07800601 IM	276	#define RUN_SETUP (1<<0)
07800601 IM	277	#define USE_PAGER (1<<1)
07800601	278
07800601 IM	279	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
	280	{
	281	int status;
	282	struct stat st;
b2348e1d	283	char sbuf[STRERR_BUFSIZE];
07800601	284
5d06e691	285	if (use_browser == -1)
0020ce23	286	use_browser = check_browser_config(p->cmd);
5d06e691	287
07800601 IM	288	if (use_pager == -1 && p->option & RUN_SETUP)
	289	use_pager = check_pager_config(p->cmd);
	290	if (use_pager == -1 && p->option & USE_PAGER)
	291	use_pager = 1;
	292	commit_pager_choice();
	293
2bdb2c27	294	perf_env__set_cmdline(&perf_env, argc, argv);
b0ad8ea6	295	status = p->fn(argc, argv);
8a0a9c7e	296	perf_config__exit();
f3a1f0ea	297	exit_browser(status);
aa36ddd7	298	perf_env__exit(&perf_env);
84c86ca1	299	bpf__clear();
f3a1f0ea	300
07800601 IM	301	if (status)
	302	return status & 0xff;
	303
	304	/* Somebody closed stdout? */
	305	if (fstat(fileno(stdout), &st))
	306	return 0;
	307	/* Ignore write errors for pipes and sockets.. */
	308	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	309	return 0;
	310
2a16bf8c	311	status = 1;
07800601	312	/* Check for ENOSPC and EIO errors.. */
2a16bf8c	313	if (fflush(stdout)) {
b2348e1d	314	fprintf(stderr, "write failure on standard output: %s",
c8b5f2c9	315	str_error_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	316	goto out;
	317	}
	318	if (ferror(stdout)) {
	319	fprintf(stderr, "unknown write failure on standard output");
	320	goto out;
	321	}
	322	if (fclose(stdout)) {
b2348e1d	323	fprintf(stderr, "close failed on standard output: %s",
c8b5f2c9	324	str_error_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	325	goto out;
	326	}
	327	status = 0;
	328	out:
	329	return status;
07800601 IM	330	}
	331
	332	static void handle_internal_command(int argc, const char **argv)
	333	{
	334	const char *cmd = argv[0];
f37a291c	335	unsigned int i;
07800601 IM	336
	337	/* Turn "perf cmd --help" into "perf help cmd" */
	338	if (argc > 1 && !strcmp(argv[1], "--help")) {
	339	argv[1] = argv[0];
	340	argv[0] = cmd = "help";
	341	}
	342
	343	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	344	struct cmd_struct *p = commands+i;
	345	if (strcmp(p->cmd, cmd))
	346	continue;
	347	exit(run_builtin(p, argc, argv));
	348	}
	349	}
	350
	351	static void execv_dashed_external(const char **argv)
	352	{
5104ffb2	353	char *cmd;
07800601 IM	354	const char *tmp;
	355	int status;
	356
5104ffb2 ACM	357	if (asprintf(&cmd, "perf-%s", argv[0]) < 0)
5104ffb2 ACM	358	goto do_die;
07800601 IM	359
	360	/*
	361	* argv[0] must be the perf command, but the argv array
	362	* belongs to the caller, and may be reused in
	363	* subsequent loop iterations. Save argv[0] and
	364	* restore it on error.
	365	*/
	366	tmp = argv[0];
5104ffb2	367	argv[0] = cmd;
07800601 IM	368
	369	/*
	370	* if we fail because the command is not found, it is
	371	* OK to return. Otherwise, we just pass along the status code.
	372	*/
	373	status = run_command_v_opt(argv, 0);
	374	if (status != -ERR_RUN_COMMAND_EXEC) {
5104ffb2 ACM	375	if (IS_RUN_COMMAND_ERR(status)) {
5104ffb2 ACM	376	do_die:
42774806 ACM	377	pr_err("FATAL: unable to run '%s'", argv[0]);
42774806 ACM	378	status = -128;
5104ffb2	379	}
07800601 IM	380	exit(-status);
	381	}
	382	errno = ENOENT; /* as if we called execvp */
	383
	384	argv[0] = tmp;
5104ffb2	385	zfree(&cmd);
07800601 IM	386	}
	387
	388	static int run_argv(int argcp, const char **argv)
	389	{
c6867701 ACM	390	/* See if it's an internal command */
c6867701 ACM	391	handle_internal_command(argcp, argv);
07800601	392
c6867701 ACM	393	/* .. then try the external ones */
	394	execv_dashed_external(*argv);
	395	return 0;
07800601 IM	396	}
07800601 IM	397
3af6e338 ACM	398	static void pthread__block_sigwinch(void)
	399	{
	400	sigset_t set;
	401
	402	sigemptyset(&set);
	403	sigaddset(&set, SIGWINCH);
	404	pthread_sigmask(SIG_BLOCK, &set, NULL);
	405	}
	406
	407	void pthread__unblock_sigwinch(void)
	408	{
	409	sigset_t set;
	410
	411	sigemptyset(&set);
	412	sigaddset(&set, SIGWINCH);
	413	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
	414	}
	415
9a3dc28b ACM	416	#ifdef _SC_LEVEL1_DCACHE_LINESIZE
	417	#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
	418	#else
	419	static void cache_line_size(int *cacheline_sizep)
	420	{
	421	if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
8811e8ea	422	pr_debug("cannot determine cache line size");
9a3dc28b ACM	423	}
	424	#endif
	425
07800601 IM	426	int main(int argc, const char **argv)
07800601 IM	427	{
ecc4c561	428	int err;
07800601	429	const char *cmd;
b2348e1d	430	char sbuf[STRERR_BUFSIZE];
4cb93446	431	int value;
07800601	432
096d3558 JP	433	/* libsubcmd init */
	434	exec_cmd_init("perf", PREFIX, PERF_EXEC_PATH, EXEC_PATH_ENVIRONMENT);
	435	pager_init(PERF_PAGER_ENVIRONMENT);
	436
918512b4	437	/* The page_size is placed in util object. */
0c1fe6b2	438	page_size = sysconf(_SC_PAGE_SIZE);
9a3dc28b	439	cache_line_size(&cacheline_size);
0c1fe6b2	440
4cb93446 ACM	441	if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
	442	sysctl_perf_event_max_stack = value;
	443
a29d5c9b ACM	444	if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
	445	sysctl_perf_event_max_contexts_per_stack = value;
	446
46113a54	447	cmd = extract_argv0_path(argv[0]);
07800601 IM	448	if (!cmd)
07800601 IM	449	cmd = "perf-help";
65d4b265	450
14cbfbeb NK	451	srandom(time(NULL));
14cbfbeb NK	452
8a0a9c7e	453	perf_config__init();
ecc4c561 ACM	454	err = perf_config(perf_default_config, NULL);
	455	if (err)
	456	return err;
58cb9d65	457	set_buildid_dir(NULL);
b8cbb349	458
65d4b265 JO	459	/* get debugfs/tracefs mount point from /proc/mounts */
	460	tracing_path_mount();
	461
07800601 IM	462	/*
	463	* "perf-xxxx" is the same as "perf xxxx", but we obviously:
	464	*
	465	* - cannot take flags in between the "perf" and the "xxxx".
	466	* - cannot execute it externally (since it would just do
	467	* the same thing over again)
	468	*
	469	* So we just directly call the internal command handler, and
	470	* die if that one cannot handle it.
	471	*/
	472	if (!prefixcmp(cmd, "perf-")) {
266dfb0b	473	cmd += 5;
07800601 IM	474	argv[0] = cmd;
07800601 IM	475	handle_internal_command(argc, argv);
2a16bf8c ACM	476	fprintf(stderr, "cannot handle %s internally", cmd);
2a16bf8c ACM	477	goto out;
07800601	478	}
b52bc234	479	if (!prefixcmp(cmd, "trace")) {
1b572622	480	#ifdef HAVE_LIBAUDIT_SUPPORT
b52bc234 ACM	481	setup_path();
b52bc234 ACM	482	argv[0] = "trace";
b0ad8ea6	483	return cmd_trace(argc, argv);
1b572622 ACM	484	#else
	485	fprintf(stderr,
	486	"trace command not available: missing audit-libs devel package at build time.\n");
	487	goto out;
b52bc234	488	#endif
1b572622	489	}
07800601 IM	490	/* Look for flags.. */
	491	argv++;
	492	argc--;
	493	handle_options(&argv, &argc, NULL);
	494	commit_pager_choice();
45de34bb	495
07800601 IM	496	if (argc > 0) {
	497	if (!prefixcmp(argv[0], "--"))
	498	argv[0] += 2;
	499	} else {
	500	/* The user didn't specify a command; give them help */
502fc5c7	501	printf("\n usage: %s\n\n", perf_usage_string);
07800601	502	list_common_cmds_help();
502fc5c7	503	printf("\n %s\n\n", perf_more_info_string);
2a16bf8c	504	goto out;
07800601 IM	505	}
	506	cmd = argv[0];
	507
52502bf2 JO	508	test_attr__init();
52502bf2 JO	509
07800601 IM	510	/*
07800601 IM	511	* We use PATH to find perf commands, but we prepend some higher
659431fc	512	* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
07800601 IM	513	* environment, and the $(perfexecdir) from the Makefile at build
	514	* time.
	515	*/
	516	setup_path();
3af6e338 ACM	517	/*
	518	* Block SIGWINCH notifications so that the thread that wants it can
	519	* unblock and get syscalls like select interrupted instead of waiting
	520	* forever while the signal goes to some other non interested thread.
	521	*/
	522	pthread__block_sigwinch();
07800601	523
dd629cc0 JO	524	perf_debug_setup();
dd629cc0 JO	525
07800601	526	while (1) {
4c574159	527	static int done_help;
c6867701 ACM	528
c6867701 ACM	529	run_argv(&argc, &argv);
8035e428	530
07800601 IM	531	if (errno != ENOENT)
07800601 IM	532	break;
8035e428	533
07800601 IM	534	if (!done_help) {
	535	cmd = argv[0] = help_unknown_cmd(cmd);
	536	done_help = 1;
	537	} else
	538	break;
	539	}
	540
	541	fprintf(stderr, "Failed to run command '%s': %s\n",
c8b5f2c9	542	cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c	543	out:
07800601 IM	544	return 1;
07800601 IM	545	}