[deliverable/linux.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/debug.h"
#include <api/fs/debugfs.h>
#include <pthread.h>

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

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

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

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

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

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);
			}
			perf_debugfs_set_path((*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)) {
			perf_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 if (!strcmp(cmd, "--debug")) {
			if (*argc < 2) {
				fprintf(stderr, "No variable specified for --debug.\n");
				usage(perf_usage_string);
			}
			if (perf_debug_option((*argv)[1]))
				usage(perf_usage_string);

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

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

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

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

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

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

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

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

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

		ret = 1;
	}

	errno = saved_errno;

	return ret;
}

const char perf_version_string[] = PERF_VERSION;

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

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

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

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

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

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

	if (status)
		return status & 0xff;

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

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

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

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

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

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

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

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

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

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

	argv[0] = tmp;

	strbuf_release(&cmd);
}

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

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

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

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

	return done_alias;
}

static void pthread__block_sigwinch(void)
{
	sigset_t set;

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

void pthread__unblock_sigwinch(void)
{
	sigset_t set;

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

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

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

	cmd = perf_extract_argv0_path(argv[0]);
	if (!cmd)
		cmd = "perf-help";
	/* get debugfs mount point from /proc/mounts */
	perf_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;
	}
	if (!prefixcmp(cmd, "trace")) {
#ifdef HAVE_LIBAUDIT_SUPPORT
		set_buildid_dir(NULL);
		setup_path();
		argv[0] = "trace";
		return cmd_trace(argc, argv, NULL);
#else
		fprintf(stderr,
			"trace command not available: missing audit-libs devel package at build time.\n");
		goto out;
#endif
	}
	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc, NULL);
	commit_pager_choice();
	set_buildid_dir(NULL);

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

	test_attr__init();

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

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

		if (errno != ENOENT)
			break;

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

	fprintf(stderr, "Failed to run command '%s': %s\n",
		cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
out:
	return 1;
}
Commit	Line	Data
bf9e1876 IM	1	/*
	2	* perf.c
	3	*
	4	* Performance analysis utility.
	5	*
	6	* This is the main hub from which the sub-commands (perf stat,
	7	* perf top, perf record, perf report, etc.) are started.
	8	*/
07800601	9	#include "builtin.h"
bf9e1876	10
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"
bbb2cea7	16	#include "util/debug.h"
553873e1	17	#include <api/fs/debugfs.h>
27683dc5	18	#include <pthread.h>
07800601 IM	19
07800601 IM	20	const char perf_usage_string[] =
78a1b503	21	"perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
07800601 IM	22
	23	const char perf_more_info_string[] =
	24	"See 'perf help COMMAND' for more information on a specific command.";
	25
5d06e691	26	int use_browser = -1;
07800601	27	static int use_pager = -1;
70cb4e96	28	const char *input_name;
5d06e691	29
98a4179c FW	30	struct cmd_struct {
	31	const char *cmd;
	32	int (fn)(int, const char , const char );
	33	int option;
	34	};
	35
	36	static struct cmd_struct commands[] = {
	37	{ "buildid-cache", cmd_buildid_cache, 0 },
	38	{ "buildid-list", cmd_buildid_list, 0 },
	39	{ "diff", cmd_diff, 0 },
	40	{ "evlist", cmd_evlist, 0 },
	41	{ "help", cmd_help, 0 },
	42	{ "list", cmd_list, 0 },
	43	{ "record", cmd_record, 0 },
	44	{ "report", cmd_report, 0 },
	45	{ "bench", cmd_bench, 0 },
	46	{ "stat", cmd_stat, 0 },
	47	{ "timechart", cmd_timechart, 0 },
	48	{ "top", cmd_top, 0 },
	49	{ "annotate", cmd_annotate, 0 },
	50	{ "version", cmd_version, 0 },
	51	{ "script", cmd_script, 0 },
	52	{ "sched", cmd_sched, 0 },
89fe808a	53	#ifdef HAVE_LIBELF_SUPPORT
98a4179c	54	{ "probe", cmd_probe, 0 },
393be2e3	55	#endif
98a4179c FW	56	{ "kmem", cmd_kmem, 0 },
	57	{ "lock", cmd_lock, 0 },
	58	{ "kvm", cmd_kvm, 0 },
	59	{ "test", cmd_test, 0 },
89fe808a	60	#ifdef HAVE_LIBAUDIT_SUPPORT
514f1c67	61	{ "trace", cmd_trace, 0 },
4d29089c	62	#endif
98a4179c	63	{ "inject", cmd_inject, 0 },
028f12ee	64	{ "mem", cmd_mem, 0 },
98a4179c FW	65	};
98a4179c FW	66
07800601 IM	67	struct pager_config {
	68	const char *cmd;
	69	int val;
	70	};
	71
	72	static int pager_command_config(const char var, const char value, void *data)
	73	{
	74	struct pager_config *c = data;
	75	if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
	76	c->val = perf_config_bool(var, value);
	77	return 0;
	78	}
	79
	80	/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
	81	int check_pager_config(const char *cmd)
	82	{
	83	struct pager_config c;
	84	c.cmd = cmd;
	85	c.val = -1;
	86	perf_config(pager_command_config, &c);
	87	return c.val;
	88	}
	89
0020ce23	90	static int browser_command_config(const char var, const char value, void *data)
5d06e691 ACM	91	{
	92	struct pager_config *c = data;
	93	if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
	94	c->val = perf_config_bool(var, value);
0020ce23 NK	95	if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
0020ce23 NK	96	c->val = perf_config_bool(var, value) ? 2 : 0;
5d06e691 ACM	97	return 0;
	98	}
	99
0020ce23 NK	100	/*
	101	* returns 0 for "no tui", 1 for "use tui", 2 for "use gtk",
	102	* and -1 for "not specified"
	103	*/
	104	static int check_browser_config(const char *cmd)
5d06e691 ACM	105	{
	106	struct pager_config c;
	107	c.cmd = cmd;
	108	c.val = -1;
0020ce23	109	perf_config(browser_command_config, &c);
5d06e691 ACM	110	return c.val;
	111	}
	112
4c574159 TF	113	static void commit_pager_choice(void)
4c574159 TF	114	{
07800601 IM	115	switch (use_pager) {
	116	case 0:
	117	setenv("PERF_PAGER", "cat", 1);
	118	break;
	119	case 1:
	120	/* setup_pager(); */
	121	break;
	122	default:
	123	break;
	124	}
	125	}
	126
4c574159	127	static int handle_options(const char **argv, int argc, int *envchanged)
07800601 IM	128	{
	129	int handled = 0;
	130
	131	while (*argc > 0) {
	132	const char cmd = (argv)[0];
	133	if (cmd[0] != '-')
	134	break;
	135
	136	/*
	137	* For legacy reasons, the "version" and "help"
	138	* commands can be written with "--" prepended
	139	* to make them look like flags.
	140	*/
	141	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	142	break;
	143
	144	/*
	145	* Check remaining flags.
	146	*/
cfed95a6 VL	147	if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
cfed95a6 VL	148	cmd += strlen(CMD_EXEC_PATH);
07800601 IM	149	if (*cmd == '=')
	150	perf_set_argv_exec_path(cmd + 1);
	151	else {
	152	puts(perf_exec_path());
	153	exit(0);
	154	}
	155	} else if (!strcmp(cmd, "--html-path")) {
	156	puts(system_path(PERF_HTML_PATH));
	157	exit(0);
	158	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
	159	use_pager = 1;
	160	} else if (!strcmp(cmd, "--no-pager")) {
	161	use_pager = 0;
	162	if (envchanged)
	163	*envchanged = 1;
	164	} else if (!strcmp(cmd, "--perf-dir")) {
	165	if (*argc < 2) {
4c574159	166	fprintf(stderr, "No directory given for --perf-dir.\n");
07800601 IM	167	usage(perf_usage_string);
	168	}
	169	setenv(PERF_DIR_ENVIRONMENT, (*argv)[1], 1);
	170	if (envchanged)
	171	*envchanged = 1;
	172	(*argv)++;
	173	(*argc)--;
	174	handled++;
cfed95a6 VL	175	} else if (!prefixcmp(cmd, CMD_PERF_DIR)) {
cfed95a6 VL	176	setenv(PERF_DIR_ENVIRONMENT, cmd + strlen(CMD_PERF_DIR), 1);
07800601 IM	177	if (envchanged)
	178	*envchanged = 1;
	179	} else if (!strcmp(cmd, "--work-tree")) {
	180	if (*argc < 2) {
4c574159	181	fprintf(stderr, "No directory given for --work-tree.\n");
07800601 IM	182	usage(perf_usage_string);
	183	}
	184	setenv(PERF_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
	185	if (envchanged)
	186	*envchanged = 1;
	187	(*argv)++;
	188	(*argc)--;
cfed95a6 VL	189	} else if (!prefixcmp(cmd, CMD_WORK_TREE)) {
cfed95a6 VL	190	setenv(PERF_WORK_TREE_ENVIRONMENT, cmd + strlen(CMD_WORK_TREE), 1);
07800601 IM	191	if (envchanged)
07800601 IM	192	*envchanged = 1;
5beeded1 JB	193	} else if (!strcmp(cmd, "--debugfs-dir")) {
	194	if (*argc < 2) {
	195	fprintf(stderr, "No directory given for --debugfs-dir.\n");
	196	usage(perf_usage_string);
	197	}
1355915a	198	perf_debugfs_set_path((*argv)[1]);
5beeded1 JB	199	if (envchanged)
	200	*envchanged = 1;
	201	(*argv)++;
	202	(*argc)--;
99ce8e9f JO	203	} else if (!strcmp(cmd, "--buildid-dir")) {
	204	if (*argc < 2) {
	205	fprintf(stderr, "No directory given for --buildid-dir.\n");
	206	usage(perf_usage_string);
	207	}
	208	set_buildid_dir((*argv)[1]);
	209	if (envchanged)
	210	*envchanged = 1;
	211	(*argv)++;
	212	(*argc)--;
cfed95a6	213	} else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
1355915a	214	perf_debugfs_set_path(cmd + strlen(CMD_DEBUGFS_DIR));
ebf294bf	215	fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
5beeded1 JB	216	if (envchanged)
5beeded1 JB	217	*envchanged = 1;
98a4179c FW	218	} else if (!strcmp(cmd, "--list-cmds")) {
	219	unsigned int i;
	220
	221	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	222	struct cmd_struct *p = commands+i;
	223	printf("%s ", p->cmd);
	224	}
	225	exit(0);
bbb2cea7 JO	226	} else if (!strcmp(cmd, "--debug")) {
	227	if (*argc < 2) {
	228	fprintf(stderr, "No variable specified for --debug.\n");
	229	usage(perf_usage_string);
	230	}
	231	if (perf_debug_option((*argv)[1]))
	232	usage(perf_usage_string);
	233
	234	(*argv)++;
	235	(*argc)--;
07800601 IM	236	} else {
	237	fprintf(stderr, "Unknown option: %s\n", cmd);
	238	usage(perf_usage_string);
	239	}
	240
	241	(*argv)++;
	242	(*argc)--;
	243	handled++;
	244	}
	245	return handled;
	246	}
	247
	248	static int handle_alias(int argcp, const char **argv)
	249	{
	250	int envchanged = 0, ret = 0, saved_errno = errno;
	251	int count, option_count;
4c574159	252	const char **new_argv;
07800601 IM	253	const char *alias_command;
07800601 IM	254	char *alias_string;
07800601 IM	255
	256	alias_command = (*argv)[0];
	257	alias_string = alias_lookup(alias_command);
	258	if (alias_string) {
	259	if (alias_string[0] == '!') {
	260	if (*argcp > 1) {
	261	struct strbuf buf;
	262
	263	strbuf_init(&buf, PATH_MAX);
	264	strbuf_addstr(&buf, alias_string);
	265	sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
	266	free(alias_string);
	267	alias_string = buf.buf;
	268	}
	269	ret = system(alias_string + 1);
	270	if (ret >= 0 && WIFEXITED(ret) &&
	271	WEXITSTATUS(ret) != 127)
	272	exit(WEXITSTATUS(ret));
	273	die("Failed to run '%s' when expanding alias '%s'",
	274	alias_string + 1, alias_command);
	275	}
	276	count = split_cmdline(alias_string, &new_argv);
	277	if (count < 0)
	278	die("Bad alias.%s string", alias_command);
	279	option_count = handle_options(&new_argv, &count, &envchanged);
	280	if (envchanged)
	281	die("alias '%s' changes environment variables\n"
	282	"You can use '!perf' in the alias to do this.",
	283	alias_command);
	284	memmove(new_argv - option_count, new_argv,
	285	count * sizeof(char *));
	286	new_argv -= option_count;
	287
	288	if (count < 1)
	289	die("empty alias for %s", alias_command);
	290
	291	if (!strcmp(alias_command, new_argv[0]))
	292	die("recursive alias: %s", alias_command);
	293
4c574159	294	new_argv = realloc(new_argv, sizeof(char )
07800601 IM	295	(count + *argcp + 1));
07800601 IM	296	/* insert after command name */
4c574159 TF	297	memcpy(new_argv + count, argv + 1, sizeof(char ) * *argcp);
4c574159 TF	298	new_argv[count + *argcp] = NULL;
07800601 IM	299
	300	*argv = new_argv;
	301	*argcp += count - 1;
	302
	303	ret = 1;
	304	}
	305
	306	errno = saved_errno;
	307
	308	return ret;
	309	}
	310
	311	const char perf_version_string[] = PERF_VERSION;
	312
	313	#define RUN_SETUP (1<<0)
	314	#define USE_PAGER (1<<1)
	315	/*
	316	* require working tree to be present -- anything uses this needs
	317	* RUN_SETUP for reading from the configuration file.
	318	*/
	319	#define NEED_WORK_TREE (1<<2)
	320
07800601 IM	321	static int run_builtin(struct cmd_struct p, int argc, const char *argv)
	322	{
	323	int status;
	324	struct stat st;
	325	const char *prefix;
b2348e1d	326	char sbuf[STRERR_BUFSIZE];
07800601 IM	327
	328	prefix = NULL;
	329	if (p->option & RUN_SETUP)
	330	prefix = NULL; /* setup_perf_directory(); */
	331
5d06e691	332	if (use_browser == -1)
0020ce23	333	use_browser = check_browser_config(p->cmd);
5d06e691	334
07800601 IM	335	if (use_pager == -1 && p->option & RUN_SETUP)
	336	use_pager = check_pager_config(p->cmd);
	337	if (use_pager == -1 && p->option & USE_PAGER)
	338	use_pager = 1;
	339	commit_pager_choice();
	340
07800601	341	status = p->fn(argc, argv, prefix);
f3a1f0ea ACM	342	exit_browser(status);
f3a1f0ea ACM	343
07800601 IM	344	if (status)
	345	return status & 0xff;
	346
	347	/* Somebody closed stdout? */
	348	if (fstat(fileno(stdout), &st))
	349	return 0;
	350	/* Ignore write errors for pipes and sockets.. */
	351	if (S_ISFIFO(st.st_mode) \|\| S_ISSOCK(st.st_mode))
	352	return 0;
	353
2a16bf8c	354	status = 1;
07800601	355	/* Check for ENOSPC and EIO errors.. */
2a16bf8c	356	if (fflush(stdout)) {
b2348e1d MH	357	fprintf(stderr, "write failure on standard output: %s",
b2348e1d MH	358	strerror_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	359	goto out;
	360	}
	361	if (ferror(stdout)) {
	362	fprintf(stderr, "unknown write failure on standard output");
	363	goto out;
	364	}
	365	if (fclose(stdout)) {
b2348e1d MH	366	fprintf(stderr, "close failed on standard output: %s",
b2348e1d MH	367	strerror_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c ACM	368	goto out;
	369	}
	370	status = 0;
	371	out:
	372	return status;
07800601 IM	373	}
	374
	375	static void handle_internal_command(int argc, const char **argv)
	376	{
	377	const char *cmd = argv[0];
f37a291c	378	unsigned int i;
07800601 IM	379	static const char ext[] = STRIP_EXTENSION;
	380
	381	if (sizeof(ext) > 1) {
	382	i = strlen(argv[0]) - strlen(ext);
	383	if (i > 0 && !strcmp(argv[0] + i, ext)) {
	384	char *argv0 = strdup(argv[0]);
	385	argv[0] = cmd = argv0;
	386	argv0[i] = '\0';
	387	}
	388	}
	389
	390	/* Turn "perf cmd --help" into "perf help cmd" */
	391	if (argc > 1 && !strcmp(argv[1], "--help")) {
	392	argv[1] = argv[0];
	393	argv[0] = cmd = "help";
	394	}
	395
	396	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	397	struct cmd_struct *p = commands+i;
	398	if (strcmp(p->cmd, cmd))
	399	continue;
	400	exit(run_builtin(p, argc, argv));
	401	}
	402	}
	403
	404	static void execv_dashed_external(const char **argv)
	405	{
	406	struct strbuf cmd = STRBUF_INIT;
	407	const char *tmp;
	408	int status;
	409
	410	strbuf_addf(&cmd, "perf-%s", argv[0]);
	411
	412	/*
	413	* argv[0] must be the perf command, but the argv array
	414	* belongs to the caller, and may be reused in
	415	* subsequent loop iterations. Save argv[0] and
	416	* restore it on error.
	417	*/
	418	tmp = argv[0];
	419	argv[0] = cmd.buf;
	420
	421	/*
	422	* if we fail because the command is not found, it is
	423	* OK to return. Otherwise, we just pass along the status code.
	424	*/
	425	status = run_command_v_opt(argv, 0);
	426	if (status != -ERR_RUN_COMMAND_EXEC) {
	427	if (IS_RUN_COMMAND_ERR(status))
	428	die("unable to run '%s'", argv[0]);
	429	exit(-status);
	430	}
	431	errno = ENOENT; /* as if we called execvp */
	432
	433	argv[0] = tmp;
	434
	435	strbuf_release(&cmd);
	436	}
	437
	438	static int run_argv(int argcp, const char **argv)
	439	{
	440	int done_alias = 0;
	441
	442	while (1) {
443	/* See if it's an internal command */
444	handle_internal_command(argcp, argv);
445
446	/* .. then try the external ones */
447	execv_dashed_external(*argv);
448
449	/* It could be an alias -- this works around the insanity
450	* of overriding "perf log" with "perf show" by having
451	* alias.log = show
452	*/
453	if (done_alias \|\| !handle_alias(argcp, argv))
454	break;
455	done_alias = 1;
456	}
457
458	return done_alias;
459	}
460
3af6e338 ACM	461	static void pthread__block_sigwinch(void)
	462	{
	463	sigset_t set;
	464
	465	sigemptyset(&set);
	466	sigaddset(&set, SIGWINCH);
	467	pthread_sigmask(SIG_BLOCK, &set, NULL);
	468	}
	469
	470	void pthread__unblock_sigwinch(void)
	471	{
	472	sigset_t set;
	473
	474	sigemptyset(&set);
	475	sigaddset(&set, SIGWINCH);
	476	pthread_sigmask(SIG_UNBLOCK, &set, NULL);
	477	}
	478
07800601 IM	479	int main(int argc, const char **argv)
	480	{
	481	const char *cmd;
b2348e1d	482	char sbuf[STRERR_BUFSIZE];
07800601	483
918512b4	484	/* The page_size is placed in util object. */
0c1fe6b2	485	page_size = sysconf(_SC_PAGE_SIZE);
2b1b7100	486	cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
0c1fe6b2	487
07800601 IM	488	cmd = perf_extract_argv0_path(argv[0]);
	489	if (!cmd)
	490	cmd = "perf-help";
5beeded1	491	/* get debugfs mount point from /proc/mounts */
1355915a	492	perf_debugfs_mount(NULL);
07800601 IM	493	/*
	494	* "perf-xxxx" is the same as "perf xxxx", but we obviously:
	495	*
	496	* - cannot take flags in between the "perf" and the "xxxx".
	497	* - cannot execute it externally (since it would just do
	498	* the same thing over again)
	499	*
	500	* So we just directly call the internal command handler, and
	501	* die if that one cannot handle it.
	502	*/
	503	if (!prefixcmp(cmd, "perf-")) {
266dfb0b	504	cmd += 5;
07800601 IM	505	argv[0] = cmd;
07800601 IM	506	handle_internal_command(argc, argv);
2a16bf8c ACM	507	fprintf(stderr, "cannot handle %s internally", cmd);
2a16bf8c ACM	508	goto out;
07800601	509	}
b52bc234	510	if (!prefixcmp(cmd, "trace")) {
1b572622	511	#ifdef HAVE_LIBAUDIT_SUPPORT
99ce8e9f	512	set_buildid_dir(NULL);
b52bc234 ACM	513	setup_path();
	514	argv[0] = "trace";
	515	return cmd_trace(argc, argv, NULL);
1b572622 ACM	516	#else
	517	fprintf(stderr,
	518	"trace command not available: missing audit-libs devel package at build time.\n");
	519	goto out;
b52bc234	520	#endif
1b572622	521	}
07800601 IM	522	/* Look for flags.. */
	523	argv++;
	524	argc--;
	525	handle_options(&argv, &argc, NULL);
	526	commit_pager_choice();
99ce8e9f	527	set_buildid_dir(NULL);
45de34bb	528
07800601 IM	529	if (argc > 0) {
	530	if (!prefixcmp(argv[0], "--"))
	531	argv[0] += 2;
	532	} else {
	533	/* The user didn't specify a command; give them help */
502fc5c7	534	printf("\n usage: %s\n\n", perf_usage_string);
07800601	535	list_common_cmds_help();
502fc5c7	536	printf("\n %s\n\n", perf_more_info_string);
2a16bf8c	537	goto out;
07800601 IM	538	}
	539	cmd = argv[0];
	540
52502bf2 JO	541	test_attr__init();
52502bf2 JO	542
07800601 IM	543	/*
07800601 IM	544	* We use PATH to find perf commands, but we prepend some higher
659431fc	545	* precedence paths: the "--exec-path" option, the PERF_EXEC_PATH
07800601 IM	546	* environment, and the $(perfexecdir) from the Makefile at build
	547	* time.
	548	*/
	549	setup_path();
3af6e338 ACM	550	/*
	551	* Block SIGWINCH notifications so that the thread that wants it can
	552	* unblock and get syscalls like select interrupted instead of waiting
	553	* forever while the signal goes to some other non interested thread.
	554	*/
	555	pthread__block_sigwinch();
07800601 IM	556
07800601 IM	557	while (1) {
4c574159	558	static int done_help;
b5ded713	559	int was_alias = run_argv(&argc, &argv);
8035e428	560
07800601 IM	561	if (errno != ENOENT)
07800601 IM	562	break;
8035e428	563
07800601 IM	564	if (was_alias) {
	565	fprintf(stderr, "Expansion of alias '%s' failed; "
	566	"'%s' is not a perf-command\n",
	567	cmd, argv[0]);
2a16bf8c	568	goto out;
07800601 IM	569	}
	570	if (!done_help) {
	571	cmd = argv[0] = help_unknown_cmd(cmd);
	572	done_help = 1;
	573	} else
	574	break;
	575	}
	576
	577	fprintf(stderr, "Failed to run command '%s': %s\n",
b2348e1d	578	cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
2a16bf8c	579	out:
07800601 IM	580	return 1;
07800601 IM	581	}