[net-next-2.6.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/exec_cmd.h"
#include "util/cache.h"
#include "util/quote.h"
#include "util/run-command.h"
#include "util/parse-events.h"
#include "util/debugfs.h"

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

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

static char debugfs_mntpt[MAXPATHLEN];

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 tui_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);
	return 0;
}

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

static void set_debugfs_path(void)
{
	char *path;

	path = getenv(PERF_DEBUGFS_ENVIRONMENT);
	snprintf(debugfs_path, MAXPATHLEN, "%s/%s", path ?: debugfs_mntpt,
		 "tracing/events");
}

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;

		/*
		 * 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);
			}
			strncpy(debugfs_mntpt, (*argv)[1], MAXPATHLEN);
			debugfs_mntpt[MAXPATHLEN - 1] = '\0';
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
			strncpy(debugfs_mntpt, cmd + strlen(CMD_DEBUGFS_DIR), MAXPATHLEN);
			debugfs_mntpt[MAXPATHLEN - 1] = '\0';
			if (envchanged)
				*envchanged = 1;
		} 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)

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

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

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

	if (use_browser == -1)
		use_browser = check_tui_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();
	set_debugfs_path();

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

	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;

	/* Check for ENOSPC and EIO errors.. */
	if (fflush(stdout))
		die("write failure on standard output: %s", strerror(errno));
	if (ferror(stdout))
		die("unknown write failure on standard output");
	if (fclose(stdout))
		die("close failed on standard output: %s", strerror(errno));
	return 0;
}

static void handle_internal_command(int argc, const char **argv)
{
	const char *cmd = argv[0];
	static struct cmd_struct commands[] = {
		{ "buildid-cache", cmd_buildid_cache, 0 },
		{ "buildid-list", cmd_buildid_list, 0 },
		{ "diff",	cmd_diff,	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 },
		{ "trace",	cmd_trace,	0 },
		{ "sched",	cmd_sched,	0 },
		{ "probe",	cmd_probe,	0 },
		{ "kmem",	cmd_kmem,	0 },
		{ "lock",	cmd_lock,	0 },
		{ "kvm",	cmd_kvm,	0 },
		{ "test",	cmd_test,	0 },
		{ "inject",	cmd_inject,	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;
}

/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
static void get_debugfs_mntpt(void)
{
	const char *path = debugfs_mount(NULL);

	if (path)
		strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
	else
		debugfs_mntpt[0] = '\0';
}

int main(int argc, const char **argv)
{
	const char *cmd;

	cmd = perf_extract_argv0_path(argv[0]);
	if (!cmd)
		cmd = "perf-help";
	/* get debugfs mount point from /proc/mounts */
	get_debugfs_mntpt();
	/*
	 * "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);
		die("cannot handle %s internally", cmd);
	}

	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc, NULL);
	commit_pager_choice();
	set_debugfs_path();
	set_buildid_dir();

	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);
		exit(1);
	}
	cmd = argv[0];

	/*
	 * 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();

	while (1) {
		static int done_help;
		static int was_alias;

		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]);
			exit(1);
		}
		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(errno));

	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
148be2c1 IM	11	#include "util/exec_cmd.h"
	12	#include "util/cache.h"
	13	#include "util/quote.h"
	14	#include "util/run-command.h"
5beeded1	15	#include "util/parse-events.h"
549104f2	16	#include "util/debugfs.h"
07800601 IM	17
07800601 IM	18	const char perf_usage_string[] =
cc13a591	19	"perf [--version] [--help] COMMAND [ARGS]";
07800601 IM	20
	21	const char perf_more_info_string[] =
	22	"See 'perf help COMMAND' for more information on a specific command.";
	23
5d06e691	24	int use_browser = -1;
07800601	25	static int use_pager = -1;
5d06e691	26
07800601 IM	27	struct pager_config {
	28	const char *cmd;
	29	int val;
	30	};
	31
5beeded1 JB	32	static char debugfs_mntpt[MAXPATHLEN];
5beeded1 JB	33
07800601 IM	34	static int pager_command_config(const char var, const char value, void *data)
	35	{
	36	struct pager_config *c = data;
	37	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	38	c->val = perf_config_bool(var, value);
	39	return 0;
	40	}
	41
	42	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	43	int check_pager_config(const char *cmd)
	44	{
	45	struct pager_config c;
	46	c.cmd = cmd;
	47	c.val = -1;
	48	perf_config(pager_command_config, &c);
	49	return c.val;
	50	}
	51
5d06e691 ACM	52	static int tui_command_config(const char var, const char value, void *data)
	53	{
	54	struct pager_config *c = data;
	55	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
	56	c->val = perf_config_bool(var, value);
	57	return 0;
	58	}
	59
	60	/* returns 0 for "no tui", 1 for "use tui", and -1 for "not specified" */
	61	static int check_tui_config(const char *cmd)
	62	{
	63	struct pager_config c;
	64	c.cmd = cmd;
	65	c.val = -1;
	66	perf_config(tui_command_config, &c);
	67	return c.val;
	68	}
	69
4c574159 TF	70	static void commit_pager_choice(void)
4c574159 TF	71	{
07800601 IM	72	switch (use_pager) {
	73	case 0:
	74	setenv("PERF_PAGER", "cat", 1);
	75	break;
	76	case 1:
	77	/* setup_pager(); */
	78	break;
	79	default:
	80	break;
	81	}
	82	}
	83
5beeded1 JB	84	static void set_debugfs_path(void)
	85	{
	86	char *path;
	87
	88	path = getenv(PERF_DEBUGFS_ENVIRONMENT);
	89	snprintf(debugfs_path, MAXPATHLEN, "%s/%s", path ?: debugfs_mntpt,
	90	"tracing/events");
	91	}
	92
4c574159	93	static int handle_options(const char **argv, int argc, int *envchanged)
07800601 IM	94	{
	95	int handled = 0;
	96
	97	while (*argc > 0) {
	98	const char cmd = (argv)[0];
	99	if (cmd[0] != '-')
	100	break;
	101
	102	/*
	103	* For legacy reasons, the "version" and "help"
	104	* commands can be written with "--" prepended
	105	* to make them look like flags.
	106	*/
	107	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	108	break;
	109
	110	/*
	111	* Check remaining flags.
	112	*/
cfed95a6 VL	113	if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
cfed95a6 VL	114	cmd += strlen(CMD_EXEC_PATH);
07800601 IM	115	if (*cmd == '=')
	116	perf_set_argv_exec_path(cmd + 1);
	117	else {
	118	puts(perf_exec_path());
	119	exit(0);
	120	}
	121	} else if (!strcmp(cmd, "--html-path")) {
	122	puts(system_path(PERF_HTML_PATH));
	123	exit(0);
	124	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
	125	use_pager = 1;
	126	} else if (!strcmp(cmd, "--no-pager")) {
	127	use_pager = 0;
	128	if (envchanged)
	129	*envchanged = 1;
	130	} else if (!strcmp(cmd, "--perf-dir")) {
	131	if (*argc < 2) {
4c574159	132	fprintf(stderr, "No directory given for --perf-dir.\n");
07800601 IM	133	usage(perf_usage_string);
	134	}
	135	setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
	136	if (envchanged)
	137	*envchanged = 1;
	138	(*argv)++;
	139	(*argc)--;
	140	handled++;
cfed95a6 VL	141	} else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
cfed95a6 VL	142	setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
07800601 IM	143	if (envchanged)
	144	*envchanged = 1;
	145	} else if (!strcmp(cmd, "--work-tree")) {
	146	if (*argc < 2) {
4c574159	147	fprintf(stderr, "No directory given for --work-tree.\n");
07800601 IM	148	usage(perf_usage_string);
	149	}
	150	setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
	151	if (envchanged)
	152	*envchanged = 1;
	153	(*argv)++;
	154	(*argc)--;
cfed95a6 VL	155	} else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
cfed95a6 VL	156	setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
07800601 IM	157	if (envchanged)
07800601 IM	158	*envchanged = 1;
5beeded1 JB	159	} else if (!strcmp(cmd, "--debugfs-dir")) {
	160	if (*argc < 2) {
	161	fprintf(stderr, "No directory given for --debugfs-dir.\n");
	162	usage(perf_usage_string);
	163	}
	164	strncpy(debugfs_mntpt, (*argv)[1], MAXPATHLEN);
	165	debugfs_mntpt[MAXPATHLEN - 1] = '\0';
	166	if (envchanged)
	167	*envchanged = 1;
	168	(*argv)++;
	169	(*argc)--;
cfed95a6 VL	170	} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
cfed95a6 VL	171	strncpy(debugfs_mntpt, cmd + strlen(CMD_DEBUGFS_DIR), MAXPATHLEN);
5beeded1 JB	172	debugfs_mntpt[MAXPATHLEN - 1] = '\0';
	173	if (envchanged)
	174	*envchanged = 1;
07800601 IM	175	} else {
	176	fprintf(stderr, "Unknown option: %s\n", cmd);
	177	usage(perf_usage_string);
	178	}
	179
	180	(*argv)++;
	181	(*argc)--;
	182	handled++;
	183	}
	184	return handled;
	185	}
	186
	187	static int handle_alias(int argcp, const char **argv)
	188	{
	189	int envchanged = 0, ret = 0, saved_errno = errno;
	190	int count, option_count;
4c574159	191	const char **new_argv;
07800601 IM	192	const char *alias_command;
07800601 IM	193	char *alias_string;
07800601 IM	194
	195	alias_command = (*argv)[0];
	196	alias_string = alias_lookup(alias_command);
	197	if (alias_string) {
	198	if (alias_string[0] == '!') {
	199	if (*argcp > 1) {
	200	struct strbuf buf;
	201
	202	strbuf_init(&buf, PATH_MAX);
	203	strbuf_addstr(&buf, alias_string);
	204	sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
	205	free(alias_string);
	206	alias_string = buf.buf;
	207	}
	208	ret = system(alias_string + 1);
	209	if (ret >= 0 && WIFEXITED(ret) &&
	210	WEXITSTATUS(ret) != 127)
	211	exit(WEXITSTATUS(ret));
	212	die("Failed to run '%s' when expanding alias '%s'",
	213	alias_string + 1, alias_command);
	214	}
	215	count = split_cmdline(alias_string, &new_argv);
	216	if (count < 0)
	217	die("Bad alias.%s string", alias_command);
	218	option_count = handle_options(&new_argv, &count, &envchanged);
	219	if (envchanged)
	220	die("alias '%s' changes environment variables\n"
	221	"You can use '!perf' in the alias to do this.",
	222	alias_command);
	223	memmove(new_argv - option_count, new_argv,
	224	count * sizeof(char *));
	225	new_argv -= option_count;
	226
	227	if (count < 1)
	228	die("empty alias for %s", alias_command);
	229
	230	if (!strcmp(alias_command, new_argv[0]))
	231	die("recursive alias: %s", alias_command);
	232
4c574159	233	new_argv = realloc(new_argv, sizeof(char )
07800601 IM	234	(count + *argcp + 1));
07800601 IM	235	/* insert after command name */
4c574159 TF	236	memcpy(new_argv + count, argv + 1, sizeof(char ) * *argcp);
4c574159 TF	237	new_argv[count + *argcp] = NULL;
07800601 IM	238
	239	*argv = new_argv;
	240	*argcp += count - 1;
	241
	242	ret = 1;
	243	}
	244
	245	errno = saved_errno;
	246
	247	return ret;
	248	}
	249
	250	const char perf_version_string[] = PERF_VERSION;
	251
	252	#define RUN_SETUP (1<<0)
	253	#define USE_PAGER (1<<1)
	254	/*
	255	* require working tree to be present -- anything uses this needs
	256	* RUN_SETUP for reading from the configuration file.
	257	*/
	258	#define NEED_WORK_TREE (1<<2)
	259
	260	struct cmd_struct {
	261	const char *cmd;
	262	int (fn)(int, const char , const char );
	263	int option;
	264	};
	265
	266	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
	267	{
	268	int status;
	269	struct stat st;
	270	const char *prefix;
	271
	272	prefix = NULL;
	273	if (p->option & RUN_SETUP)
	274	prefix = NULL; /* setup_perf_directory(); */
	275
5d06e691 ACM	276	if (use_browser == -1)
	277	use_browser = check_tui_config(p->cmd);
	278
07800601 IM	279	if (use_pager == -1 && p->option & RUN_SETUP)
	280	use_pager = check_pager_config(p->cmd);
	281	if (use_pager == -1 && p->option & USE_PAGER)
	282	use_pager = 1;
	283	commit_pager_choice();
5beeded1	284	set_debugfs_path();
07800601	285
07800601	286	status = p->fn(argc, argv, prefix);
f3a1f0ea ACM	287	exit_browser(status);
f3a1f0ea ACM	288
07800601 IM	289	if (status)
	290	return status & 0xff;
	291
	292	/* Somebody closed stdout? */
	293	if (fstat(fileno(stdout), &st))
	294	return 0;
	295	/* Ignore write errors for pipes and sockets.. */
	296	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	297	return 0;
	298
	299	/* Check for ENOSPC and EIO errors.. */
	300	if (fflush(stdout))
	301	die("write failure on standard output: %s", strerror(errno));
	302	if (ferror(stdout))
	303	die("unknown write failure on standard output");
	304	if (fclose(stdout))
	305	die("close failed on standard output: %s", strerror(errno));
	306	return 0;
	307	}
	308
	309	static void handle_internal_command(int argc, const char **argv)
	310	{
	311	const char *cmd = argv[0];
	312	static struct cmd_struct commands[] = {
ef12a141	313	{ "buildid-cache", cmd_buildid_cache, 0 },
c34984b2	314	{ "buildid-list", cmd_buildid_list, 0 },
86a9eee0	315	{ "diff", cmd_diff, 0 },
ba77c9e1 LZ	316	{ "help", cmd_help, 0 },
	317	{ "list", cmd_list, 0 },
	318	{ "record", cmd_record, 0 },
	319	{ "report", cmd_report, 0 },
	320	{ "bench", cmd_bench, 0 },
	321	{ "stat", cmd_stat, 0 },
	322	{ "timechart", cmd_timechart, 0 },
	323	{ "top", cmd_top, 0 },
	324	{ "annotate", cmd_annotate, 0 },
	325	{ "version", cmd_version, 0 },
	326	{ "trace", cmd_trace, 0 },
	327	{ "sched", cmd_sched, 0 },
	328	{ "probe", cmd_probe, 0 },
	329	{ "kmem", cmd_kmem, 0 },
9b5e350c	330	{ "lock", cmd_lock, 0 },
a1645ce1	331	{ "kvm", cmd_kvm, 0 },
1c6a800c	332	{ "test", cmd_test, 0 },
454c407e	333	{ "inject", cmd_inject, 0 },
07800601	334	};
f37a291c	335	unsigned int i;
07800601 IM	336	static const char ext[] = STRIP_EXTENSION;
	337
	338	if (sizeof(ext) > 1) {
	339	i = strlen(argv[0]) - strlen(ext);
	340	if (i > 0 && !strcmp(argv[0] + i, ext)) {
	341	char *argv0 = strdup(argv[0]);
	342	argv[0] = cmd = argv0;
	343	argv0[i] = '\0';
	344	}
	345	}
	346
	347	/* Turn "perf cmd --help" into "perf help cmd" */
	348	if (argc > 1 && !strcmp(argv[1], "--help")) {
	349	argv[1] = argv[0];
	350	argv[0] = cmd = "help";
	351	}
	352
	353	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	354	struct cmd_struct *p = commands+i;
	355	if (strcmp(p->cmd, cmd))
	356	continue;
	357	exit(run_builtin(p, argc, argv));
	358	}
	359	}
	360
	361	static void execv_dashed_external(const char **argv)
	362	{
	363	struct strbuf cmd = STRBUF_INIT;
	364	const char *tmp;
	365	int status;
	366
	367	strbuf_addf(&cmd, "perf-%s", argv[0]);
	368
	369	/*
	370	* argv[0] must be the perf command, but the argv array
	371	* belongs to the caller, and may be reused in
	372	* subsequent loop iterations. Save argv[0] and
	373	* restore it on error.
	374	*/
	375	tmp = argv[0];
	376	argv[0] = cmd.buf;
	377
	378	/*
	379	* if we fail because the command is not found, it is
	380	* OK to return. Otherwise, we just pass along the status code.
	381	*/
	382	status = run_command_v_opt(argv, 0);
	383	if (status != -ERR_RUN_COMMAND_EXEC) {
	384	if (IS_RUN_COMMAND_ERR(status))
	385	die("unable to run '%s'", argv[0]);
	386	exit(-status);
	387	}
	388	errno = ENOENT; /* as if we called execvp */
	389
	390	argv[0] = tmp;
	391
	392	strbuf_release(&cmd);
	393	}
	394
	395	static int run_argv(int argcp, const char **argv)
	396	{
	397	int done_alias = 0;
	398
	399	while (1) {
400	/* See if it's an internal command */
401	handle_internal_command(argcp, argv);
402
403	/* .. then try the external ones */
404	execv_dashed_external(*argv);
405
406	/* It could be an alias -- this works around the insanity
407	* of overriding "perf log" with "perf show" by having
408	* alias.log = show
409	*/
410	if (done_alias \|\| !handle_alias(argcp, argv))
411	break;
412	done_alias = 1;
413	}
414
415	return done_alias;
416	}
417
5beeded1 JB	418	/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
	419	static void get_debugfs_mntpt(void)
	420	{
29c52aa2	421	const char *path = debugfs_mount(NULL);
5beeded1	422
549104f2 CW	423	if (path)
	424	strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
	425	else
	426	debugfs_mntpt[0] = '\0';
5beeded1	427	}
07800601 IM	428
	429	int main(int argc, const char **argv)
	430	{
	431	const char *cmd;
	432
	433	cmd = perf_extract_argv0_path(argv[0]);
	434	if (!cmd)
	435	cmd = "perf-help";
5beeded1 JB	436	/* get debugfs mount point from /proc/mounts */
5beeded1 JB	437	get_debugfs_mntpt();
07800601 IM	438	/*
	439	* "perf-xxxx" is the same as "perf xxxx", but we obviously:
	440	*
	441	* - cannot take flags in between the "perf" and the "xxxx".
	442	* - cannot execute it externally (since it would just do
	443	* the same thing over again)
	444	*
	445	* So we just directly call the internal command handler, and
	446	* die if that one cannot handle it.
	447	*/
	448	if (!prefixcmp(cmd, "perf-")) {
266dfb0b	449	cmd += 5;
07800601 IM	450	argv[0] = cmd;
	451	handle_internal_command(argc, argv);
	452	die("cannot handle %s internally", cmd);
	453	}
	454
	455	/* Look for flags.. */
	456	argv++;
	457	argc--;
	458	handle_options(&argv, &argc, NULL);
	459	commit_pager_choice();
5beeded1	460	set_debugfs_path();
45de34bb SE	461	set_buildid_dir();
45de34bb SE	462
07800601 IM	463	if (argc > 0) {
	464	if (!prefixcmp(argv[0], "--"))
	465	argv[0] += 2;
	466	} else {
	467	/* The user didn't specify a command; give them help */
502fc5c7	468	printf("\n usage: %s\n\n", perf_usage_string);
07800601	469	list_common_cmds_help();
502fc5c7	470	printf("\n %s\n\n", perf_more_info_string);
07800601 IM	471	exit(1);
	472	}
	473	cmd = argv[0];
	474
	475	/*
	476	* We use PATH to find perf commands, but we prepend some higher
659431fc	477	* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
07800601 IM	478	* environment, and the $(perfexecdir) from the Makefile at build
	479	* time.
	480	*/
	481	setup_path();
	482
	483	while (1) {
4c574159 TF	484	static int done_help;
4c574159 TF	485	static int was_alias;
8035e428	486
07800601 IM	487	was_alias = run_argv(&argc, &argv);
	488	if (errno != ENOENT)
	489	break;
8035e428	490
07800601 IM	491	if (was_alias) {
	492	fprintf(stderr, "Expansion of alias '%s' failed; "
	493	"'%s' is not a perf-command\n",
	494	cmd, argv[0]);
	495	exit(1);
	496	}
	497	if (!done_help) {
	498	cmd = argv[0] = help_unknown_cmd(cmd);
	499	done_help = 1;
	500	} else
	501	break;
	502	}
	503
	504	fprintf(stderr, "Failed to run command '%s': %s\n",
	505	cmd, strerror(errno));
	506
	507	return 1;
	508	}