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Linux/tools/perf/builtin-probe.c

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  1 /*
  2  * builtin-probe.c
  3  *
  4  * Builtin probe command: Set up probe events by C expression
  5  *
  6  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 21  *
 22  */
 23 #include <sys/utsname.h>
 24 #include <sys/types.h>
 25 #include <sys/stat.h>
 26 #include <fcntl.h>
 27 #include <errno.h>
 28 #include <stdio.h>
 29 #include <unistd.h>
 30 #include <stdlib.h>
 31 #include <string.h>
 32 
 33 #include "perf.h"
 34 #include "builtin.h"
 35 #include "util/util.h"
 36 #include "util/strlist.h"
 37 #include "util/strfilter.h"
 38 #include "util/symbol.h"
 39 #include "util/debug.h"
 40 #include <subcmd/parse-options.h>
 41 #include "util/probe-finder.h"
 42 #include "util/probe-event.h"
 43 #include "util/probe-file.h"
 44 
 45 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
 46 #define DEFAULT_FUNC_FILTER "!_*"
 47 #define DEFAULT_LIST_FILTER "*"
 48 
 49 /* Session management structure */
 50 static struct {
 51         int command;    /* Command short_name */
 52         bool list_events;
 53         bool uprobes;
 54         bool quiet;
 55         bool target_used;
 56         int nevents;
 57         struct perf_probe_event events[MAX_PROBES];
 58         struct line_range line_range;
 59         char *target;
 60         struct strfilter *filter;
 61 } params;
 62 
 63 /* Parse an event definition. Note that any error must die. */
 64 static int parse_probe_event(const char *str)
 65 {
 66         struct perf_probe_event *pev = &params.events[params.nevents];
 67         int ret;
 68 
 69         pr_debug("probe-definition(%d): %s\n", params.nevents, str);
 70         if (++params.nevents == MAX_PROBES) {
 71                 pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
 72                 return -1;
 73         }
 74 
 75         pev->uprobes = params.uprobes;
 76         if (params.target) {
 77                 pev->target = strdup(params.target);
 78                 if (!pev->target)
 79                         return -ENOMEM;
 80                 params.target_used = true;
 81         }
 82 
 83         /* Parse a perf-probe command into event */
 84         ret = parse_perf_probe_command(str, pev);
 85         pr_debug("%d arguments\n", pev->nargs);
 86 
 87         return ret;
 88 }
 89 
 90 static int params_add_filter(const char *str)
 91 {
 92         const char *err = NULL;
 93         int ret = 0;
 94 
 95         pr_debug2("Add filter: %s\n", str);
 96         if (!params.filter) {
 97                 params.filter = strfilter__new(str, &err);
 98                 if (!params.filter)
 99                         ret = err ? -EINVAL : -ENOMEM;
100         } else
101                 ret = strfilter__or(params.filter, str, &err);
102 
103         if (ret == -EINVAL) {
104                 pr_err("Filter parse error at %td.\n", err - str + 1);
105                 pr_err("Source: \"%s\"\n", str);
106                 pr_err("         %*c\n", (int)(err - str + 1), '^');
107         }
108 
109         return ret;
110 }
111 
112 static int set_target(const char *ptr)
113 {
114         int found = 0;
115         const char *buf;
116 
117         /*
118          * The first argument after options can be an absolute path
119          * to an executable / library or kernel module.
120          *
121          * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
122          * short module name.
123          */
124         if (!params.target && ptr && *ptr == '/') {
125                 params.target = strdup(ptr);
126                 if (!params.target)
127                         return -ENOMEM;
128                 params.target_used = false;
129 
130                 found = 1;
131                 buf = ptr + (strlen(ptr) - 3);
132 
133                 if (strcmp(buf, ".ko"))
134                         params.uprobes = true;
135 
136         }
137 
138         return found;
139 }
140 
141 static int parse_probe_event_argv(int argc, const char **argv)
142 {
143         int i, len, ret, found_target;
144         char *buf;
145 
146         found_target = set_target(argv[0]);
147         if (found_target < 0)
148                 return found_target;
149 
150         if (found_target && argc == 1)
151                 return 0;
152 
153         /* Bind up rest arguments */
154         len = 0;
155         for (i = 0; i < argc; i++) {
156                 if (i == 0 && found_target)
157                         continue;
158 
159                 len += strlen(argv[i]) + 1;
160         }
161         buf = zalloc(len + 1);
162         if (buf == NULL)
163                 return -ENOMEM;
164         len = 0;
165         for (i = 0; i < argc; i++) {
166                 if (i == 0 && found_target)
167                         continue;
168 
169                 len += sprintf(&buf[len], "%s ", argv[i]);
170         }
171         ret = parse_probe_event(buf);
172         free(buf);
173         return ret;
174 }
175 
176 static int opt_set_target(const struct option *opt, const char *str,
177                         int unset __maybe_unused)
178 {
179         int ret = -ENOENT;
180         char *tmp;
181 
182         if  (str) {
183                 if (!strcmp(opt->long_name, "exec"))
184                         params.uprobes = true;
185                 else if (!strcmp(opt->long_name, "module"))
186                         params.uprobes = false;
187                 else
188                         return ret;
189 
190                 /* Expand given path to absolute path, except for modulename */
191                 if (params.uprobes || strchr(str, '/')) {
192                         tmp = realpath(str, NULL);
193                         if (!tmp) {
194                                 pr_warning("Failed to get the absolute path of %s: %m\n", str);
195                                 return ret;
196                         }
197                 } else {
198                         tmp = strdup(str);
199                         if (!tmp)
200                                 return -ENOMEM;
201                 }
202                 free(params.target);
203                 params.target = tmp;
204                 params.target_used = false;
205                 ret = 0;
206         }
207 
208         return ret;
209 }
210 
211 /* Command option callbacks */
212 
213 #ifdef HAVE_DWARF_SUPPORT
214 static int opt_show_lines(const struct option *opt,
215                           const char *str, int unset __maybe_unused)
216 {
217         int ret = 0;
218 
219         if (!str)
220                 return 0;
221 
222         if (params.command == 'L') {
223                 pr_warning("Warning: more than one --line options are"
224                            " detected. Only the first one is valid.\n");
225                 return 0;
226         }
227 
228         params.command = opt->short_name;
229         ret = parse_line_range_desc(str, &params.line_range);
230 
231         return ret;
232 }
233 
234 static int opt_show_vars(const struct option *opt,
235                          const char *str, int unset __maybe_unused)
236 {
237         struct perf_probe_event *pev = &params.events[params.nevents];
238         int ret;
239 
240         if (!str)
241                 return 0;
242 
243         ret = parse_probe_event(str);
244         if (!ret && pev->nargs != 0) {
245                 pr_err("  Error: '--vars' doesn't accept arguments.\n");
246                 return -EINVAL;
247         }
248         params.command = opt->short_name;
249 
250         return ret;
251 }
252 #else
253 # define opt_show_lines NULL
254 # define opt_show_vars NULL
255 #endif
256 static int opt_add_probe_event(const struct option *opt,
257                               const char *str, int unset __maybe_unused)
258 {
259         if (str) {
260                 params.command = opt->short_name;
261                 return parse_probe_event(str);
262         }
263 
264         return 0;
265 }
266 
267 static int opt_set_filter_with_command(const struct option *opt,
268                                        const char *str, int unset)
269 {
270         if (!unset)
271                 params.command = opt->short_name;
272 
273         if (str)
274                 return params_add_filter(str);
275 
276         return 0;
277 }
278 
279 static int opt_set_filter(const struct option *opt __maybe_unused,
280                           const char *str, int unset __maybe_unused)
281 {
282         if (str)
283                 return params_add_filter(str);
284 
285         return 0;
286 }
287 
288 static int init_params(void)
289 {
290         return line_range__init(&params.line_range);
291 }
292 
293 static void cleanup_params(void)
294 {
295         int i;
296 
297         for (i = 0; i < params.nevents; i++)
298                 clear_perf_probe_event(params.events + i);
299         line_range__clear(&params.line_range);
300         free(params.target);
301         strfilter__delete(params.filter);
302         memset(&params, 0, sizeof(params));
303 }
304 
305 static void pr_err_with_code(const char *msg, int err)
306 {
307         char sbuf[STRERR_BUFSIZE];
308 
309         pr_err("%s", msg);
310         pr_debug(" Reason: %s (Code: %d)",
311                  str_error_r(-err, sbuf, sizeof(sbuf)), err);
312         pr_err("\n");
313 }
314 
315 static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
316 {
317         int ret;
318         int i, k;
319         const char *event = NULL, *group = NULL;
320 
321         ret = init_probe_symbol_maps(pevs->uprobes);
322         if (ret < 0)
323                 return ret;
324 
325         ret = convert_perf_probe_events(pevs, npevs);
326         if (ret < 0)
327                 goto out_cleanup;
328 
329         if (params.command == 'D') {    /* it shows definition */
330                 ret = show_probe_trace_events(pevs, npevs);
331                 goto out_cleanup;
332         }
333 
334         ret = apply_perf_probe_events(pevs, npevs);
335         if (ret < 0)
336                 goto out_cleanup;
337 
338         for (i = k = 0; i < npevs; i++)
339                 k += pevs[i].ntevs;
340 
341         pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
342         for (i = 0; i < npevs; i++) {
343                 struct perf_probe_event *pev = &pevs[i];
344 
345                 for (k = 0; k < pev->ntevs; k++) {
346                         struct probe_trace_event *tev = &pev->tevs[k];
347 
348                         /* We use tev's name for showing new events */
349                         show_perf_probe_event(tev->group, tev->event, pev,
350                                               tev->point.module, false);
351 
352                         /* Save the last valid name */
353                         event = tev->event;
354                         group = tev->group;
355                 }
356         }
357 
358         /* Note that it is possible to skip all events because of blacklist */
359         if (event) {
360                 /* Show how to use the event. */
361                 pr_info("\nYou can now use it in all perf tools, such as:\n\n");
362                 pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
363         }
364 
365 out_cleanup:
366         cleanup_perf_probe_events(pevs, npevs);
367         exit_probe_symbol_maps();
368         return ret;
369 }
370 
371 static int del_perf_probe_caches(struct strfilter *filter)
372 {
373         struct probe_cache *cache;
374         struct strlist *bidlist;
375         struct str_node *nd;
376         int ret;
377 
378         bidlist = build_id_cache__list_all(false);
379         if (!bidlist) {
380                 ret = -errno;
381                 pr_debug("Failed to get buildids: %d\n", ret);
382                 return ret ?: -ENOMEM;
383         }
384 
385         strlist__for_each_entry(nd, bidlist) {
386                 cache = probe_cache__new(nd->s);
387                 if (!cache)
388                         continue;
389                 if (probe_cache__filter_purge(cache, filter) < 0 ||
390                     probe_cache__commit(cache) < 0)
391                         pr_warning("Failed to remove entries for %s\n", nd->s);
392                 probe_cache__delete(cache);
393         }
394         return 0;
395 }
396 
397 static int perf_del_probe_events(struct strfilter *filter)
398 {
399         int ret, ret2, ufd = -1, kfd = -1;
400         char *str = strfilter__string(filter);
401         struct strlist *klist = NULL, *ulist = NULL;
402         struct str_node *ent;
403 
404         if (!str)
405                 return -EINVAL;
406 
407         pr_debug("Delete filter: \'%s\'\n", str);
408 
409         if (probe_conf.cache)
410                 return del_perf_probe_caches(filter);
411 
412         /* Get current event names */
413         ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
414         if (ret < 0)
415                 goto out;
416 
417         klist = strlist__new(NULL, NULL);
418         ulist = strlist__new(NULL, NULL);
419         if (!klist || !ulist) {
420                 ret = -ENOMEM;
421                 goto out;
422         }
423 
424         ret = probe_file__get_events(kfd, filter, klist);
425         if (ret == 0) {
426                 strlist__for_each_entry(ent, klist)
427                         pr_info("Removed event: %s\n", ent->s);
428 
429                 ret = probe_file__del_strlist(kfd, klist);
430                 if (ret < 0)
431                         goto error;
432         }
433 
434         ret2 = probe_file__get_events(ufd, filter, ulist);
435         if (ret2 == 0) {
436                 strlist__for_each_entry(ent, ulist)
437                         pr_info("Removed event: %s\n", ent->s);
438 
439                 ret2 = probe_file__del_strlist(ufd, ulist);
440                 if (ret2 < 0)
441                         goto error;
442         }
443 
444         if (ret == -ENOENT && ret2 == -ENOENT)
445                 pr_warning("\"%s\" does not hit any event.\n", str);
446         else
447                 ret = 0;
448 
449 error:
450         if (kfd >= 0)
451                 close(kfd);
452         if (ufd >= 0)
453                 close(ufd);
454 out:
455         strlist__delete(klist);
456         strlist__delete(ulist);
457         free(str);
458 
459         return ret;
460 }
461 
462 #ifdef HAVE_DWARF_SUPPORT
463 #define PROBEDEF_STR    \
464         "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
465 #else
466 #define PROBEDEF_STR    "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
467 #endif
468 
469 
470 static int
471 __cmd_probe(int argc, const char **argv)
472 {
473         const char * const probe_usage[] = {
474                 "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
475                 "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
476                 "perf probe [<options>] --del '[GROUP:]EVENT' ...",
477                 "perf probe --list [GROUP:]EVENT ...",
478 #ifdef HAVE_DWARF_SUPPORT
479                 "perf probe [<options>] --line 'LINEDESC'",
480                 "perf probe [<options>] --vars 'PROBEPOINT'",
481 #endif
482                 "perf probe [<options>] --funcs",
483                 NULL
484         };
485         struct option options[] = {
486         OPT_INCR('v', "verbose", &verbose,
487                     "be more verbose (show parsed arguments, etc)"),
488         OPT_BOOLEAN('q', "quiet", &params.quiet,
489                     "be quiet (do not show any messages)"),
490         OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
491                              "list up probe events",
492                              opt_set_filter_with_command, DEFAULT_LIST_FILTER),
493         OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
494                      opt_set_filter_with_command),
495         OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
496                 "probe point definition, where\n"
497                 "\t\tGROUP:\tGroup name (optional)\n"
498                 "\t\tEVENT:\tEvent name\n"
499                 "\t\tFUNC:\tFunction name\n"
500                 "\t\tOFF:\tOffset from function entry (in byte)\n"
501                 "\t\t%return:\tPut the probe at function return\n"
502 #ifdef HAVE_DWARF_SUPPORT
503                 "\t\tSRC:\tSource code path\n"
504                 "\t\tRL:\tRelative line number from function entry.\n"
505                 "\t\tAL:\tAbsolute line number in file.\n"
506                 "\t\tPT:\tLazy expression of line code.\n"
507                 "\t\tARG:\tProbe argument (local variable name or\n"
508                 "\t\t\tkprobe-tracer argument format.)\n",
509 #else
510                 "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
511 #endif
512                 opt_add_probe_event),
513         OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
514                 "Show trace event definition of given traceevent for k/uprobe_events.",
515                 opt_add_probe_event),
516         OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
517                     " with existing name"),
518         OPT_CALLBACK('L', "line", NULL,
519                      "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
520                      "Show source code lines.", opt_show_lines),
521         OPT_CALLBACK('V', "vars", NULL,
522                      "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
523                      "Show accessible variables on PROBEDEF", opt_show_vars),
524         OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
525                     "Show external variables too (with --vars only)"),
526         OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
527                 "Show variables location range in scope (with --vars only)"),
528         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
529                    "file", "vmlinux pathname"),
530         OPT_STRING('s', "source", &symbol_conf.source_prefix,
531                    "directory", "path to kernel source"),
532         OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
533                 "Don't search inlined functions"),
534         OPT__DRY_RUN(&probe_event_dry_run),
535         OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
536                  "Set how many probe points can be found for a probe."),
537         OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
538                              "Show potential probe-able functions.",
539                              opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
540         OPT_CALLBACK('\0', "filter", NULL,
541                      "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
542                      "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
543                      "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
544                      opt_set_filter),
545         OPT_CALLBACK('x', "exec", NULL, "executable|path",
546                         "target executable name or path", opt_set_target),
547         OPT_CALLBACK('m', "module", NULL, "modname|path",
548                 "target module name (for online) or path (for offline)",
549                 opt_set_target),
550         OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
551                     "Enable symbol demangling"),
552         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
553                     "Enable kernel symbol demangling"),
554         OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
555         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
556                    "Look for files with symbols relative to this directory"),
557         OPT_END()
558         };
559         int ret;
560 
561         set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
562         set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
563         set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
564         set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
565 #ifdef HAVE_DWARF_SUPPORT
566         set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
567         set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
568 #else
569 # define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_DWARF=1", c)
570         set_nobuild('L', "line", false);
571         set_nobuild('V', "vars", false);
572         set_nobuild('\0', "externs", false);
573         set_nobuild('\0', "range", false);
574         set_nobuild('k', "vmlinux", true);
575         set_nobuild('s', "source", true);
576         set_nobuild('\0', "no-inlines", true);
577 # undef set_nobuild
578 #endif
579         set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
580 
581         argc = parse_options(argc, argv, options, probe_usage,
582                              PARSE_OPT_STOP_AT_NON_OPTION);
583         if (argc > 0) {
584                 if (strcmp(argv[0], "-") == 0) {
585                         usage_with_options_msg(probe_usage, options,
586                                 "'-' is not supported.\n");
587                 }
588                 if (params.command && params.command != 'a') {
589                         usage_with_options_msg(probe_usage, options,
590                                 "another command except --add is set.\n");
591                 }
592                 ret = parse_probe_event_argv(argc, argv);
593                 if (ret < 0) {
594                         pr_err_with_code("  Error: Command Parse Error.", ret);
595                         return ret;
596                 }
597                 params.command = 'a';
598         }
599 
600         if (params.quiet) {
601                 if (verbose != 0) {
602                         pr_err("  Error: -v and -q are exclusive.\n");
603                         return -EINVAL;
604                 }
605                 verbose = -1;
606         }
607 
608         if (probe_conf.max_probes == 0)
609                 probe_conf.max_probes = MAX_PROBES;
610 
611         /*
612          * Only consider the user's kernel image path if given.
613          */
614         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
615 
616         /*
617          * Except for --list, --del and --add, other command doesn't depend
618          * nor change running kernel. So if user gives offline vmlinux,
619          * ignore its buildid.
620          */
621         if (!strchr("lda", params.command) && symbol_conf.vmlinux_name)
622                 symbol_conf.ignore_vmlinux_buildid = true;
623 
624         switch (params.command) {
625         case 'l':
626                 if (params.uprobes) {
627                         pr_err("  Error: Don't use --list with --exec.\n");
628                         parse_options_usage(probe_usage, options, "l", true);
629                         parse_options_usage(NULL, options, "x", true);
630                         return -EINVAL;
631                 }
632                 ret = show_perf_probe_events(params.filter);
633                 if (ret < 0)
634                         pr_err_with_code("  Error: Failed to show event list.", ret);
635                 return ret;
636         case 'F':
637                 ret = show_available_funcs(params.target, params.filter,
638                                         params.uprobes);
639                 if (ret < 0)
640                         pr_err_with_code("  Error: Failed to show functions.", ret);
641                 return ret;
642 #ifdef HAVE_DWARF_SUPPORT
643         case 'L':
644                 ret = show_line_range(&params.line_range, params.target,
645                                       params.uprobes);
646                 if (ret < 0)
647                         pr_err_with_code("  Error: Failed to show lines.", ret);
648                 return ret;
649         case 'V':
650                 if (!params.filter)
651                         params.filter = strfilter__new(DEFAULT_VAR_FILTER,
652                                                        NULL);
653 
654                 ret = show_available_vars(params.events, params.nevents,
655                                           params.filter);
656                 if (ret < 0)
657                         pr_err_with_code("  Error: Failed to show vars.", ret);
658                 return ret;
659 #endif
660         case 'd':
661                 ret = perf_del_probe_events(params.filter);
662                 if (ret < 0) {
663                         pr_err_with_code("  Error: Failed to delete events.", ret);
664                         return ret;
665                 }
666                 break;
667         case 'D':
668         case 'a':
669 
670                 /* Ensure the last given target is used */
671                 if (params.target && !params.target_used) {
672                         pr_err("  Error: -x/-m must follow the probe definitions.\n");
673                         parse_options_usage(probe_usage, options, "m", true);
674                         parse_options_usage(NULL, options, "x", true);
675                         return -EINVAL;
676                 }
677 
678                 ret = perf_add_probe_events(params.events, params.nevents);
679                 if (ret < 0) {
680                         pr_err_with_code("  Error: Failed to add events.", ret);
681                         return ret;
682                 }
683                 break;
684         default:
685                 usage_with_options(probe_usage, options);
686         }
687         return 0;
688 }
689 
690 int cmd_probe(int argc, const char **argv)
691 {
692         int ret;
693 
694         ret = init_params();
695         if (!ret) {
696                 ret = __cmd_probe(argc, argv);
697                 cleanup_params();
698         }
699 
700         return ret < 0 ? ret : 0;
701 }
702 

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