37fb4b8bc3a867ee06ff3e52b3c9155a7069e1a6
2 * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <sys/types.h>
28 #include "../command.h"
31 static char *opt_session_name
;
32 static char *opt_viewer
;
33 static char *opt_trace_path
;
34 static const char *babeltrace_bin
= CONFIG_BABELTRACE_BIN
;
35 //static const char *lttv_gui_bin = CONFIG_LTTV_GUI_BIN;
42 static struct poptOption long_options
[] = {
43 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
44 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
45 {"list-options", 0, POPT_ARG_NONE
, NULL
, OPT_LIST_OPTIONS
, NULL
, NULL
},
46 {"viewer", 'e', POPT_ARG_STRING
, &opt_viewer
, 0, 0, 0},
47 {"trace-path", 't', POPT_ARG_STRING
, &opt_trace_path
, 0, 0, 0},
52 * This is needed for each viewer since we are using execvp().
54 static const char *babeltrace_opts
[] = { "babeltrace" };
55 //static const char *lttv_gui_opts[] = { "lttv-gui", "-t", };
58 * Type is also use as the index in the viewers array. So please, make sure
59 * your enum value is in the right order in the array below.
62 VIEWER_BABELTRACE
= 0,
64 VIEWER_USER_DEFINED
= 2,
68 * NOTE: "lttv" is a shell command and it's not working for exec() family
69 * functions so we might think of removing this wrapper or using bash.
71 static struct viewers
{
72 const char *exec_name
;
73 enum viewer_type type
;
75 { "babeltrace", VIEWER_BABELTRACE
},
76 { "lttv-gui", VIEWER_LTTV_GUI
},
77 { NULL
, VIEWER_USER_DEFINED
},
80 /* Is the session we are trying to view is in live mode. */
81 static int session_live_mode
;
86 static void usage(FILE *ofp
)
88 fprintf(ofp
, "usage: lttng view [SESSION_NAME] [OPTIONS]\n");
90 fprintf(ofp
, "By default, the babeltrace viewer will be used for text viewing\n");
92 fprintf(ofp
, "Where SESSION_NAME is an optional session name. If not specified, lttng will\n");
93 fprintf(ofp
, "get it from the configuration file (.lttngrc).\n");
95 fprintf(ofp
, "Options:\n");
96 fprintf(ofp
, " -h, --help Show this help\n");
97 fprintf(ofp
, " --list-options Simple listing of options\n");
98 fprintf(ofp
, " -t, --trace-path PATH Trace directory path for the viewer\n");
99 fprintf(ofp
, " -e, --viewer CMD Specify viewer and/or options to use\n");
100 fprintf(ofp
, " This will completely override the default viewers so\n");
101 fprintf(ofp
, " please make sure to specify the full command. The trace\n");
102 fprintf(ofp
, " directory path of the session will be appended at the end\n");
103 fprintf(ofp
, " to the arguments\n");
107 static struct viewers
*parse_options(void)
109 if (opt_viewer
== NULL
) {
110 /* Default is babeltrace */
111 return &(viewers
[VIEWER_BABELTRACE
]);
115 if (strstr(opt_viewer
, viewers
[VIEWER_LTTV_GUI
].exec_name
) == 0) {
116 return &(viewers
[VIEWER_LTTV_GUI
]);
121 * This means that if -e, --viewers is used, we just override everything
122 * with it. For supported viewers like lttv, we could simply detect if "-t"
123 * is passed and if not, add the trace directory to it.
125 return &(viewers
[VIEWER_USER_DEFINED
]);
129 * Alloc an array of string pointer from a simple string having all options
130 * seperated by spaces. Also adds the trace path to the arguments.
132 * The returning pointer is ready to be passed to execvp().
134 static char **alloc_argv_from_user_opts(char *opts
, const char *trace_path
)
136 int i
= 0, ignore_space
= 0;
137 unsigned int num_opts
= 1;
138 char **argv
, *token
= opts
;
140 /* Count number of arguments. */
143 /* Use to ignore consecutive spaces */
152 } while (*token
!= '\0');
154 /* Add two here for the NULL terminating element and trace path */
155 argv
= malloc(sizeof(char *) * (num_opts
+ 2));
160 token
= strtok(opts
, " ");
161 while (token
!= NULL
) {
162 argv
[i
] = strdup(token
);
163 token
= strtok(NULL
, " ");
167 argv
[num_opts
] = (char *) trace_path
;
168 argv
[num_opts
+ 1] = NULL
;
177 * Alloc an array of string pointer from an array of strings. It also adds
178 * the trace path to the argv.
180 * The returning pointer is ready to be passed to execvp().
182 static char **alloc_argv_from_local_opts(const char **opts
, size_t opts_len
,
183 const char *trace_path
)
186 size_t size
, mem_len
;
189 /* Add one for the NULL terminating element. */
190 mem_len
= opts_len
+ 1;
191 if (session_live_mode
) {
192 /* Add 3 option for the live mode being "-i lttng-live URL". */
195 /* Add option for the trace path. */
199 size
= sizeof(char *) * mem_len
;
201 /* Add two here for the trace_path and the NULL terminating element. */
207 memcpy(argv
, opts
, size
);
209 if (session_live_mode
) {
210 argv
[opts_len
] = "-i";
211 argv
[opts_len
+ 1] = "lttng-live";
212 argv
[opts_len
+ 2] = (char *) trace_path
;
213 argv
[opts_len
+ 3] = NULL
;
215 argv
[opts_len
] = (char *) trace_path
;
216 argv
[opts_len
+ 1] = NULL
;
224 * Spawn viewer with the trace directory path.
226 static int spawn_viewer(const char *trace_path
)
230 const char *viewer_bin
= NULL
;
231 struct viewers
*viewer
;
234 /* Check for --viewer options */
235 viewer
= parse_options();
236 if (viewer
== NULL
) {
241 switch (viewer
->type
) {
242 case VIEWER_BABELTRACE
:
243 if (stat(babeltrace_bin
, &status
) == 0) {
244 viewer_bin
= babeltrace_bin
;
246 viewer_bin
= viewer
->exec_name
;
248 argv
= alloc_argv_from_local_opts(babeltrace_opts
,
249 ARRAY_SIZE(babeltrace_opts
), trace_path
);
252 case VIEWER_LTTV_GUI
:
253 if (stat(lttv_gui_bin
, &status
) == 0) {
254 viewer_bin
= lttv_gui_bin
;
256 viewer_bin
= viewer
->exec_name
;
258 argv
= alloc_argv_from_local_opts(lttv_gui_opts
,
259 ARRAY_SIZE(lttv_gui_opts
), trace_path
);
262 case VIEWER_USER_DEFINED
:
263 argv
= alloc_argv_from_user_opts(opt_viewer
, trace_path
);
265 viewer_bin
= argv
[0];
269 viewer_bin
= viewers
[VIEWER_BABELTRACE
].exec_name
;
270 argv
= alloc_argv_from_local_opts(babeltrace_opts
,
271 ARRAY_SIZE(babeltrace_opts
), trace_path
);
280 DBG("Using %s viewer", viewer_bin
);
282 ret
= execvp(viewer_bin
, argv
);
284 if (errno
== ENOENT
) {
285 ERR("%s not found on the system", viewer_bin
);
287 PERROR("exec: %s", viewer_bin
);
299 * Build the live path we need for the lttng live view.
301 static char *build_live_path(char *session_name
)
305 char hostname
[HOST_NAME_MAX
];
307 ret
= gethostname(hostname
, sizeof(hostname
));
309 perror("gethostname");
313 ret
= asprintf(&path
, "net://localhost/host/%s/%s", hostname
,
316 perror("asprintf live path");
325 * Exec viewer if found and use session name path.
327 static int view_trace(void)
330 char *session_name
, *trace_path
= NULL
;
331 struct lttng_session
*sessions
= NULL
;
334 * Safety net. If lttng is suid at some point for *any* useless reasons,
335 * this prevent any bad execution of binaries.
338 if (getuid() != geteuid()) {
339 ERR("UID does not match effective UID.");
342 } else if (getgid() != getegid()) {
343 ERR("GID does not match effective GID.");
349 /* User define trace path override the session name */
350 if (opt_trace_path
) {
352 } else if(opt_session_name
== NULL
) {
353 session_name
= get_session_name();
354 if (session_name
== NULL
) {
359 session_name
= opt_session_name
;
362 DBG("Viewing trace for session %s", session_name
);
365 int i
, count
, found
= 0;
367 /* Getting all sessions */
368 count
= lttng_list_sessions(&sessions
);
370 ERR("Unable to list sessions. Session name %s not found.",
372 MSG("Is there a session daemon running?");
377 /* Find our session listed by the session daemon */
378 for (i
= 0; i
< count
; i
++) {
379 if (strncmp(sessions
[i
].name
, session_name
, NAME_MAX
) == 0) {
386 MSG("Session name %s not found", session_name
);
391 session_live_mode
= sessions
[i
].live_timer_interval
;
393 DBG("Session live mode set to %d", session_live_mode
);
395 if (sessions
[i
].enabled
&& !session_live_mode
) {
396 WARN("Session %s is running. Please stop it before reading it.",
402 /* If the timer interval is set we are in live mode. */
403 if (session_live_mode
) {
404 trace_path
= build_live_path(session_name
);
410 /* Get file system session path. */
411 trace_path
= sessions
[i
].path
;
414 trace_path
= opt_trace_path
;
417 MSG("Trace directory: %s\n", trace_path
);
419 ret
= spawn_viewer(trace_path
);
421 /* Don't set ret so lttng can interpret the sessiond error. */
426 if (session_live_mode
) {
431 if (opt_session_name
== NULL
) {
439 * The 'view <options>' first level command
441 int cmd_view(int argc
, const char **argv
)
443 int opt
, ret
= CMD_SUCCESS
;
444 static poptContext pc
;
446 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
447 poptReadDefaultConfig(pc
, 0);
450 WARN("mi does not apply to view command");
453 while ((opt
= poptGetNextOpt(pc
)) != -1) {
458 case OPT_LIST_OPTIONS
:
459 list_cmd_options(stdout
, long_options
);
468 opt_session_name
= (char*) poptGetArg(pc
);
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