[linux-2.6-block.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 <lk/debugfs.h>
#include <pthread.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;
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 LIBELF_SUPPORT
	{ "probe",	cmd_probe,	0 },
#endif
	{ "kmem",	cmd_kmem,	0 },
	{ "lock",	cmd_lock,	0 },
	{ "kvm",	cmd_kvm,	0 },
	{ "test",	cmd_test,	0 },
#ifdef LIBAUDIT_SUPPORT
	{ "trace",	cmd_trace,	0 },
#endif
	{ "inject",	cmd_inject,	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;
	}
}

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);
			}
			debugfs_set_path((*argv)[1]);
			if (envchanged)
				*envchanged = 1;
			(*argv)++;
			(*argc)--;
		} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
			debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
			fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
			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);
			}
			exit(0);
		} 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;

	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);

	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(errno));
		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(errno));
		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;

	page_size = sysconf(_SC_PAGE_SIZE);

	cmd = perf_extract_argv0_path(argv[0]);
	if (!cmd)
		cmd = "perf-help";
	/* get debugfs mount point from /proc/mounts */
	debugfs_mount(NULL);
	/*
	 * "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;
	}

	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc, NULL);
	commit_pager_choice();
	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);
		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;
		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]);
			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(errno));
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
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"
85c66be1	16	#include <lk/debugfs.h>
27683dc5	17	#include <pthread.h>
07800601 IM	18
07800601 IM	19	const char perf_usage_string[] =
cc13a591	20	"perf [--version] [--help] COMMAND [ARGS]";
07800601 IM	21
	22	const char perf_more_info_string[] =
	23	"See 'perf help COMMAND' for more information on a specific command.";
	24
5d06e691	25	int use_browser = -1;
07800601	26	static int use_pager = -1;
70cb4e96	27	const char *input_name;
5d06e691	28
98a4179c FW	29	struct cmd_struct {
	30	const char *cmd;
	31	int (fn)(int, const char , const char );
	32	int option;
	33	};
	34
	35	static struct cmd_struct commands[] = {
	36	{ "buildid-cache", cmd_buildid_cache, 0 },
	37	{ "buildid-list", cmd_buildid_list, 0 },
	38	{ "diff", cmd_diff, 0 },
	39	{ "evlist", cmd_evlist, 0 },
	40	{ "help", cmd_help, 0 },
	41	{ "list", cmd_list, 0 },
	42	{ "record", cmd_record, 0 },
	43	{ "report", cmd_report, 0 },
	44	{ "bench", cmd_bench, 0 },
	45	{ "stat", cmd_stat, 0 },
	46	{ "timechart", cmd_timechart, 0 },
	47	{ "top", cmd_top, 0 },
	48	{ "annotate", cmd_annotate, 0 },
	49	{ "version", cmd_version, 0 },
	50	{ "script", cmd_script, 0 },
	51	{ "sched", cmd_sched, 0 },
29a0fc9b	52	#ifdef LIBELF_SUPPORT
98a4179c	53	{ "probe", cmd_probe, 0 },
393be2e3	54	#endif
98a4179c FW	55	{ "kmem", cmd_kmem, 0 },
	56	{ "lock", cmd_lock, 0 },
	57	{ "kvm", cmd_kvm, 0 },
	58	{ "test", cmd_test, 0 },
f315e168	59	#ifdef LIBAUDIT_SUPPORT
514f1c67	60	{ "trace", cmd_trace, 0 },
4d29089c	61	#endif
98a4179c FW	62	{ "inject", cmd_inject, 0 },
	63	};
	64
07800601 IM	65	struct pager_config {
	66	const char *cmd;
	67	int val;
	68	};
	69
	70	static int pager_command_config(const char var, const char value, void *data)
	71	{
	72	struct pager_config *c = data;
	73	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	74	c->val = perf_config_bool(var, value);
	75	return 0;
	76	}
	77
	78	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	79	int check_pager_config(const char *cmd)
	80	{
	81	struct pager_config c;
	82	c.cmd = cmd;
	83	c.val = -1;
	84	perf_config(pager_command_config, &c);
	85	return c.val;
	86	}
	87
0020ce23	88	static int browser_command_config(const char var, const char value, void *data)
5d06e691 ACM	89	{
	90	struct pager_config *c = data;
	91	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
	92	c->val = perf_config_bool(var, value);
0020ce23 NK	93	if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
0020ce23 NK	94	c->val = perf_config_bool(var, value) ? 2 : 0;
5d06e691 ACM	95	return 0;
	96	}
	97
0020ce23 NK	98	/*
	99	* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
	100	* and -1 for "not specified"
	101	*/
	102	static int check_browser_config(const char *cmd)
5d06e691 ACM	103	{
	104	struct pager_config c;
	105	c.cmd = cmd;
	106	c.val = -1;
0020ce23	107	perf_config(browser_command_config, &c);
5d06e691 ACM	108	return c.val;
	109	}
	110
4c574159 TF	111	static void commit_pager_choice(void)
4c574159 TF	112	{
07800601 IM	113	switch (use_pager) {
	114	case 0:
	115	setenv("PERF_PAGER", "cat", 1);
	116	break;
	117	case 1:
	118	/* setup_pager(); */
	119	break;
	120	default:
	121	break;
	122	}
	123	}
	124
4c574159	125	static int handle_options(const char **argv, int argc, int *envchanged)
07800601 IM	126	{
	127	int handled = 0;
	128
	129	while (*argc > 0) {
	130	const char cmd = (argv)[0];
	131	if (cmd[0] != '-')
	132	break;
	133
	134	/*
	135	* For legacy reasons, the "version" and "help"
	136	* commands can be written with "--" prepended
	137	* to make them look like flags.
	138	*/
	139	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	140	break;
	141
	142	/*
	143	* Check remaining flags.
	144	*/
cfed95a6 VL	145	if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
cfed95a6 VL	146	cmd += strlen(CMD_EXEC_PATH);
07800601 IM	147	if (*cmd == '=')
	148	perf_set_argv_exec_path(cmd + 1);
	149	else {
	150	puts(perf_exec_path());
	151	exit(0);
	152	}
	153	} else if (!strcmp(cmd, "--html-path")) {
	154	puts(system_path(PERF_HTML_PATH));
	155	exit(0);
	156	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
	157	use_pager = 1;
	158	} else if (!strcmp(cmd, "--no-pager")) {
	159	use_pager = 0;
	160	if (envchanged)
	161	*envchanged = 1;
	162	} else if (!strcmp(cmd, "--perf-dir")) {
	163	if (*argc < 2) {
4c574159	164	fprintf(stderr, "No directory given for --perf-dir.\n");
07800601 IM	165	usage(perf_usage_string);
	166	}
	167	setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
	168	if (envchanged)
	169	*envchanged = 1;
	170	(*argv)++;
	171	(*argc)--;
	172	handled++;
cfed95a6 VL	173	} else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
cfed95a6 VL	174	setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
07800601 IM	175	if (envchanged)
	176	*envchanged = 1;
	177	} else if (!strcmp(cmd, "--work-tree")) {
	178	if (*argc < 2) {
4c574159	179	fprintf(stderr, "No directory given for --work-tree.\n");
07800601 IM	180	usage(perf_usage_string);
	181	}
	182	setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
	183	if (envchanged)
	184	*envchanged = 1;
	185	(*argv)++;
	186	(*argc)--;
cfed95a6 VL	187	} else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
cfed95a6 VL	188	setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
07800601 IM	189	if (envchanged)
07800601 IM	190	*envchanged = 1;
5beeded1 JB	191	} else if (!strcmp(cmd, "--debugfs-dir")) {
	192	if (*argc < 2) {
	193	fprintf(stderr, "No directory given for --debugfs-dir.\n");
	194	usage(perf_usage_string);
	195	}
ebf294bf	196	debugfs_set_path((*argv)[1]);
5beeded1 JB	197	if (envchanged)
	198	*envchanged = 1;
	199	(*argv)++;
	200	(*argc)--;
cfed95a6	201	} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
ebf294bf ACM	202	debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
ebf294bf ACM	203	fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
5beeded1 JB	204	if (envchanged)
5beeded1 JB	205	*envchanged = 1;
98a4179c FW	206	} else if (!strcmp(cmd, "--list-cmds")) {
	207	unsigned int i;
	208
	209	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	210	struct cmd_struct *p = commands+i;
	211	printf("%s ", p->cmd);
	212	}
	213	exit(0);
07800601 IM	214	} else {
	215	fprintf(stderr, "Unknown option: %s\n", cmd);
	216	usage(perf_usage_string);
	217	}
	218
	219	(*argv)++;
	220	(*argc)--;
	221	handled++;
	222	}
	223	return handled;
	224	}
	225
	226	static int handle_alias(int argcp, const char **argv)
	227	{
	228	int envchanged = 0, ret = 0, saved_errno = errno;
	229	int count, option_count;
4c574159	230	const char **new_argv;
07800601 IM	231	const char *alias_command;
07800601 IM	232	char *alias_string;
07800601 IM	233
	234	alias_command = (*argv)[0];
	235	alias_string = alias_lookup(alias_command);
	236	if (alias_string) {
	237	if (alias_string[0] == '!') {
	238	if (*argcp > 1) {
	239	struct strbuf buf;
	240
	241	strbuf_init(&buf, PATH_MAX);
	242	strbuf_addstr(&buf, alias_string);
	243	sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
	244	free(alias_string);
	245	alias_string = buf.buf;
	246	}
	247	ret = system(alias_string + 1);
	248	if (ret >= 0 && WIFEXITED(ret) &&
	249	WEXITSTATUS(ret) != 127)
	250	exit(WEXITSTATUS(ret));
	251	die("Failed to run '%s' when expanding alias '%s'",
	252	alias_string + 1, alias_command);
	253	}
	254	count = split_cmdline(alias_string, &new_argv);
	255	if (count < 0)
	256	die("Bad alias.%s string", alias_command);
	257	option_count = handle_options(&new_argv, &count, &envchanged);
	258	if (envchanged)
	259	die("alias '%s' changes environment variables\n"
	260	"You can use '!perf' in the alias to do this.",
	261	alias_command);
	262	memmove(new_argv - option_count, new_argv,
	263	count * sizeof(char *));
	264	new_argv -= option_count;
	265
	266	if (count < 1)
	267	die("empty alias for %s", alias_command);
	268
	269	if (!strcmp(alias_command, new_argv[0]))
	270	die("recursive alias: %s", alias_command);
	271
4c574159	272	new_argv = realloc(new_argv, sizeof(char )
07800601 IM	273	(count + *argcp + 1));
07800601 IM	274	/* insert after command name */
4c574159 TF	275	memcpy(new_argv + count, argv + 1, sizeof(char ) * *argcp);
4c574159 TF	276	new_argv[count + *argcp] = NULL;
07800601 IM	277
	278	*argv = new_argv;
	279	*argcp += count - 1;
	280
	281	ret = 1;
	282	}
	283
	284	errno = saved_errno;
	285
	286	return ret;
	287	}
	288
	289	const char perf_version_string[] = PERF_VERSION;
	290
	291	#define RUN_SETUP (1<<0)
	292	#define USE_PAGER (1<<1)
	293	/*
	294	* require working tree to be present -- anything uses this needs
	295	* RUN_SETUP for reading from the configuration file.
	296	*/
	297	#define NEED_WORK_TREE (1<<2)
	298
07800601 IM	299	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
	300	{
	301	int status;
	302	struct stat st;
	303	const char *prefix;
	304
	305	prefix = NULL;
	306	if (p->option & RUN_SETUP)
	307	prefix = NULL; /* setup_perf_directory(); */
	308
5d06e691	309	if (use_browser == -1)
0020ce23	310	use_browser = check_browser_config(p->cmd);
5d06e691	311
07800601 IM	312	if (use_pager == -1 && p->option & RUN_SETUP)
	313	use_pager = check_pager_config(p->cmd);
	314	if (use_pager == -1 && p->option & USE_PAGER)
	315	use_pager = 1;
	316	commit_pager_choice();
	317
07800601	318	status = p->fn(argc, argv, prefix);
f3a1f0ea ACM	319	exit_browser(status);
f3a1f0ea ACM	320
07800601 IM	321	if (status)
	322	return status & 0xff;
	323
	324	/* Somebody closed stdout? */
	325	if (fstat(fileno(stdout), &st))
	326	return 0;
	327	/* Ignore write errors for pipes and sockets.. */
	328	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	329	return 0;
	330
2a16bf8c	331	status = 1;
07800601	332	/* Check for ENOSPC and EIO errors.. */
2a16bf8c ACM	333	if (fflush(stdout)) {
	334	fprintf(stderr, "write failure on standard output: %s", strerror(errno));
	335	goto out;
	336	}
	337	if (ferror(stdout)) {
	338	fprintf(stderr, "unknown write failure on standard output");
	339	goto out;
	340	}
	341	if (fclose(stdout)) {
	342	fprintf(stderr, "close failed on standard output: %s", strerror(errno));
	343	goto out;
	344	}
	345	status = 0;
	346	out:
	347	return status;
07800601 IM	348	}
	349
	350	static void handle_internal_command(int argc, const char **argv)
	351	{
	352	const char *cmd = argv[0];
f37a291c	353	unsigned int i;
07800601 IM	354	static const char ext[] = STRIP_EXTENSION;
	355
	356	if (sizeof(ext) > 1) {
	357	i = strlen(argv[0]) - strlen(ext);
	358	if (i > 0 && !strcmp(argv[0] + i, ext)) {
	359	char *argv0 = strdup(argv[0]);
	360	argv[0] = cmd = argv0;
	361	argv0[i] = '\0';
	362	}
	363	}
	364
	365	/* Turn "perf cmd --help" into "perf help cmd" */
	366	if (argc > 1 && !strcmp(argv[1], "--help")) {
	367	argv[1] = argv[0];
	368	argv[0] = cmd = "help";
	369	}
	370
	371	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	372	struct cmd_struct *p = commands+i;
	373	if (strcmp(p->cmd, cmd))
	374	continue;
	375	exit(run_builtin(p, argc, argv));
	376	}
	377	}
	378
	379	static void execv_dashed_external(const char **argv)
	380	{
	381	struct strbuf cmd = STRBUF_INIT;
	382	const char *tmp;
	383	int status;
	384
	385	strbuf_addf(&cmd, "perf-%s", argv[0]);
	386
	387	/*
	388	* argv[0] must be the perf command, but the argv array
	389	* belongs to the caller, and may be reused in
	390	* subsequent loop iterations. Save argv[0] and
	391	* restore it on error.
	392	*/
	393	tmp = argv[0];
	394	argv[0] = cmd.buf;
	395
	396	/*
	397	* if we fail because the command is not found, it is
	398	* OK to return. Otherwise, we just pass along the status code.
	399	*/
	400	status = run_command_v_opt(argv, 0);
	401	if (status != -ERR_RUN_COMMAND_EXEC) {
	402	if (IS_RUN_COMMAND_ERR(status))
	403	die("unable to run '%s'", argv[0]);
	404	exit(-status);
	405	}
	406	errno = ENOENT; /* as if we called execvp */
	407
	408	argv[0] = tmp;
	409
	410	strbuf_release(&cmd);
	411	}
	412
	413	static int run_argv(int argcp, const char **argv)
	414	{
	415	int done_alias = 0;
	416
	417	while (1) {
418	/* See if it's an internal command */
419	handle_internal_command(argcp, argv);
420
421	/* .. then try the external ones */
422	execv_dashed_external(*argv);
423
424	/* It could be an alias -- this works around the insanity
425	* of overriding "perf log" with "perf show" by having
426	* alias.log = show
427	*/
428	if (done_alias \|\| !handle_alias(argcp, argv))
429	break;
430	done_alias = 1;
431	}
432
433	return done_alias;
434	}
435
3af6e338 ACM	436	static void pthread__block_sigwinch(void)
	437	{
	438	sigset_t set;
	439
	440	sigemptyset(&set);
	441	sigaddset(&set, SIGWINCH);
	442	pthread_sigmask(SIG_BLOCK, &set, NULL);
	443	}
	444
	445	void pthread__unblock_sigwinch(void)
	446	{
	447	sigset_t set;
	448
	449	sigemptyset(&set);
	450	sigaddset(&set, SIGWINCH);
	451	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
	452	}
	453
07800601 IM	454	int main(int argc, const char **argv)
	455	{
	456	const char *cmd;
	457
0c1fe6b2 ACM	458	page_size = sysconf(_SC_PAGE_SIZE);
0c1fe6b2 ACM	459
07800601 IM	460	cmd = perf_extract_argv0_path(argv[0]);
	461	if (!cmd)
	462	cmd = "perf-help";
5beeded1	463	/* get debugfs mount point from /proc/mounts */
ebf294bf	464	debugfs_mount(NULL);
07800601 IM	465	/*
	466	* "perf-xxxx" is the same as "perf xxxx", but we obviously:
	467	*
	468	* - cannot take flags in between the "perf" and the "xxxx".
	469	* - cannot execute it externally (since it would just do
	470	* the same thing over again)
	471	*
	472	* So we just directly call the internal command handler, and
	473	* die if that one cannot handle it.
	474	*/
	475	if (!prefixcmp(cmd, "perf-")) {
266dfb0b	476	cmd += 5;
07800601 IM	477	argv[0] = cmd;
07800601 IM	478	handle_internal_command(argc, argv);
2a16bf8c ACM	479	fprintf(stderr, "cannot handle %s internally", cmd);
2a16bf8c ACM	480	goto out;
07800601 IM	481	}
	482
	483	/* Look for flags.. */
	484	argv++;
	485	argc--;
	486	handle_options(&argv, &argc, NULL);
	487	commit_pager_choice();
45de34bb SE	488	set_buildid_dir();
45de34bb SE	489
07800601 IM	490	if (argc > 0) {
	491	if (!prefixcmp(argv[0], "--"))
	492	argv[0] += 2;
	493	} else {
	494	/* The user didn't specify a command; give them help */
502fc5c7	495	printf("\n usage: %s\n\n", perf_usage_string);
07800601	496	list_common_cmds_help();
502fc5c7	497	printf("\n %s\n\n", perf_more_info_string);
2a16bf8c	498	goto out;
07800601 IM	499	}
	500	cmd = argv[0];
	501
52502bf2 JO	502	test_attr__init();
52502bf2 JO	503
07800601 IM	504	/*
07800601 IM	505	* We use PATH to find perf commands, but we prepend some higher
659431fc	506	* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
07800601 IM	507	* environment, and the $(perfexecdir) from the Makefile at build
	508	* time.
	509	*/
	510	setup_path();
3af6e338 ACM	511	/*
	512	* Block SIGWINCH notifications so that the thread that wants it can
	513	* unblock and get syscalls like select interrupted instead of waiting
	514	* forever while the signal goes to some other non interested thread.
	515	*/
	516	pthread__block_sigwinch();
07800601 IM	517
07800601 IM	518	while (1) {
4c574159 TF	519	static int done_help;
4c574159 TF	520	static int was_alias;
8035e428	521
07800601 IM	522	was_alias = run_argv(&argc, &argv);
	523	if (errno != ENOENT)
	524	break;
8035e428	525
07800601 IM	526	if (was_alias) {
	527	fprintf(stderr, "Expansion of alias '%s' failed; "
	528	"'%s' is not a perf-command\n",
	529	cmd, argv[0]);
2a16bf8c	530	goto out;
07800601 IM	531	}
	532	if (!done_help) {
	533	cmd = argv[0] = help_unknown_cmd(cmd);
	534	done_help = 1;
	535	} else
	536	break;
	537	}
	538
	539	fprintf(stderr, "Failed to run command '%s': %s\n",
	540	cmd, strerror(errno));
2a16bf8c	541	out:
07800601 IM	542	return 1;
07800601 IM	543	}