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.
24 #include <sys/types.h>
27 #include "../command.h"
30 static char *opt_session_name
;
31 static char *opt_viewer
;
32 static char *opt_trace_path
;
33 static const char *babeltrace_bin
= CONFIG_BABELTRACE_BIN
;
34 //static const char *lttv_gui_bin = CONFIG_LTTV_GUI_BIN;
41 static struct poptOption long_options
[] = {
42 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
43 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
44 {"list-options", 0, POPT_ARG_NONE
, NULL
, OPT_LIST_OPTIONS
, NULL
, NULL
},
45 {"viewer", 'e', POPT_ARG_STRING
, &opt_viewer
, 0, 0, 0},
46 {"trace-path", 't', POPT_ARG_STRING
, &opt_trace_path
, 0, 0, 0},
51 * This is needed for each viewer since we are using execvp().
53 static const char *babeltrace_opts
[] = { "babeltrace" };
54 //static const char *lttv_gui_opts[] = { "lttv-gui", "-t", };
57 * Type is also use as the index in the viewers array. So please, make sure
58 * your enum value is in the right order in the array below.
61 VIEWER_BABELTRACE
= 0,
63 VIEWER_USER_DEFINED
= 2,
67 * NOTE: "lttv" is a shell command and it's not working for exec() family
68 * functions so we might think of removing this wrapper or using bash.
70 static struct viewers
{
71 const char *exec_name
;
72 enum viewer_type type
;
74 { "babeltrace", VIEWER_BABELTRACE
},
75 { "lttv-gui", VIEWER_LTTV_GUI
},
76 { NULL
, VIEWER_USER_DEFINED
},
79 /* Is the session we are trying to view is in live mode. */
80 static int session_live_mode
;
85 static void usage(FILE *ofp
)
87 fprintf(ofp
, "usage: lttng view [SESSION_NAME] [OPTIONS]\n");
89 fprintf(ofp
, "By default, the babeltrace viewer will be used for text viewing\n");
91 fprintf(ofp
, "Where SESSION_NAME is an optional session name. If not specified, lttng will\n");
92 fprintf(ofp
, "get it from the configuration file (.lttngrc).\n");
94 fprintf(ofp
, "Options:\n");
95 fprintf(ofp
, " -h, --help Show this help\n");
96 fprintf(ofp
, " --list-options Simple listing of options\n");
97 fprintf(ofp
, " -t, --trace-path PATH Trace directory path for the viewer\n");
98 fprintf(ofp
, " -e, --viewer CMD Specify viewer and/or options to use\n");
99 fprintf(ofp
, " This will completely override the default viewers so\n");
100 fprintf(ofp
, " please make sure to specify the full command. The trace\n");
101 fprintf(ofp
, " directory path of the session will be appended at the end\n");
102 fprintf(ofp
, " to the arguments\n");
106 static struct viewers
*parse_options(void)
108 if (opt_viewer
== NULL
) {
109 /* Default is babeltrace */
110 return &(viewers
[VIEWER_BABELTRACE
]);
114 if (strstr(opt_viewer
, viewers
[VIEWER_LTTV_GUI
].exec_name
) == 0) {
115 return &(viewers
[VIEWER_LTTV_GUI
]);
120 * This means that if -e, --viewers is used, we just override everything
121 * with it. For supported viewers like lttv, we could simply detect if "-t"
122 * is passed and if not, add the trace directory to it.
124 return &(viewers
[VIEWER_USER_DEFINED
]);
128 * Alloc an array of string pointer from a simple string having all options
129 * seperated by spaces. Also adds the trace path to the arguments.
131 * The returning pointer is ready to be passed to execvp().
133 static char **alloc_argv_from_user_opts(char *opts
, const char *trace_path
)
135 int i
= 0, ignore_space
= 0;
136 unsigned int num_opts
= 1;
137 char **argv
, *token
= opts
;
139 /* Count number of arguments. */
142 /* Use to ignore consecutive spaces */
151 } while (*token
!= '\0');
153 /* Add two here for the NULL terminating element and trace path */
154 argv
= malloc(sizeof(char *) * (num_opts
+ 2));
159 token
= strtok(opts
, " ");
160 while (token
!= NULL
) {
161 argv
[i
] = strdup(token
);
162 token
= strtok(NULL
, " ");
166 argv
[num_opts
] = (char *) trace_path
;
167 argv
[num_opts
+ 1] = NULL
;
176 * Alloc an array of string pointer from an array of strings. It also adds
177 * the trace path to the argv.
179 * The returning pointer is ready to be passed to execvp().
181 static char **alloc_argv_from_local_opts(const char **opts
, size_t opts_len
,
182 const char *trace_path
)
185 size_t size
, mem_len
;
188 /* Add one for the NULL terminating element. */
189 mem_len
= opts_len
+ 1;
190 if (session_live_mode
) {
191 /* Add 3 option for the live mode being "-i lttng-live URL". */
194 /* Add option for the trace path. */
198 size
= sizeof(char *) * mem_len
;
200 /* Add two here for the trace_path and the NULL terminating element. */
206 memcpy(argv
, opts
, size
);
208 if (session_live_mode
) {
209 argv
[opts_len
] = "-i";
210 argv
[opts_len
+ 1] = "lttng-live";
211 argv
[opts_len
+ 2] = (char *) trace_path
;
212 argv
[opts_len
+ 3] = NULL
;
214 argv
[opts_len
] = (char *) trace_path
;
215 argv
[opts_len
+ 1] = NULL
;
223 * Spawn viewer with the trace directory path.
225 static int spawn_viewer(const char *trace_path
)
229 const char *viewer_bin
= NULL
;
230 struct viewers
*viewer
;
233 /* Check for --viewer options */
234 viewer
= parse_options();
235 if (viewer
== NULL
) {
240 switch (viewer
->type
) {
241 case VIEWER_BABELTRACE
:
242 if (stat(babeltrace_bin
, &status
) == 0) {
243 viewer_bin
= babeltrace_bin
;
245 viewer_bin
= viewer
->exec_name
;
247 argv
= alloc_argv_from_local_opts(babeltrace_opts
,
248 ARRAY_SIZE(babeltrace_opts
), trace_path
);
251 case VIEWER_LTTV_GUI
:
252 if (stat(lttv_gui_bin
, &status
) == 0) {
253 viewer_bin
= lttv_gui_bin
;
255 viewer_bin
= viewer
->exec_name
;
257 argv
= alloc_argv_from_local_opts(lttv_gui_opts
,
258 ARRAY_SIZE(lttv_gui_opts
), trace_path
);
261 case VIEWER_USER_DEFINED
:
262 argv
= alloc_argv_from_user_opts(opt_viewer
, trace_path
);
264 viewer_bin
= argv
[0];
268 viewer_bin
= viewers
[VIEWER_BABELTRACE
].exec_name
;
269 argv
= alloc_argv_from_local_opts(babeltrace_opts
,
270 ARRAY_SIZE(babeltrace_opts
), trace_path
);
279 DBG("Using %s viewer", viewer_bin
);
281 ret
= execvp(viewer_bin
, argv
);
283 if (errno
== ENOENT
) {
284 ERR("%s not found on the system", viewer_bin
);
286 PERROR("exec: %s", viewer_bin
);
298 * Build the live path we need for the lttng live view.
300 static char *build_live_path(char *session_name
)
304 char hostname
[HOST_NAME_MAX
];
306 ret
= gethostname(hostname
, sizeof(hostname
));
308 perror("gethostname");
312 ret
= asprintf(&path
, "net://localhost/host/%s/%s", hostname
,
315 perror("asprintf live path");
324 * Exec viewer if found and use session name path.
326 static int view_trace(void)
329 char *session_name
, *trace_path
= NULL
;
330 struct lttng_session
*sessions
= NULL
;
333 * Safety net. If lttng is suid at some point for *any* useless reasons,
334 * this prevent any bad execution of binaries.
337 if (getuid() != geteuid()) {
338 ERR("UID does not match effective UID.");
341 } else if (getgid() != getegid()) {
342 ERR("GID does not match effective GID.");
348 /* User define trace path override the session name */
349 if (opt_trace_path
) {
351 } else if(opt_session_name
== NULL
) {
352 session_name
= get_session_name();
353 if (session_name
== NULL
) {
358 session_name
= opt_session_name
;
361 DBG("Viewing trace for session %s", session_name
);
364 int i
, count
, found
= 0;
366 /* Getting all sessions */
367 count
= lttng_list_sessions(&sessions
);
369 ERR("Unable to list sessions. Session name %s not found.",
371 MSG("Is there a session daemon running?");
376 /* Find our session listed by the session daemon */
377 for (i
= 0; i
< count
; i
++) {
378 if (strncmp(sessions
[i
].name
, session_name
, NAME_MAX
) == 0) {
385 MSG("Session name %s not found", session_name
);
390 session_live_mode
= sessions
[i
].live_timer_interval
;
392 DBG("Session live mode set to %d", session_live_mode
);
394 if (sessions
[i
].enabled
&& !session_live_mode
) {
395 WARN("Session %s is running. Please stop it before reading it.",
401 /* If the timer interval is set we are in live mode. */
402 if (session_live_mode
) {
403 trace_path
= build_live_path(session_name
);
409 /* Get file system session path. */
410 trace_path
= sessions
[i
].path
;
413 trace_path
= opt_trace_path
;
416 MSG("Trace directory: %s\n", trace_path
);
418 ret
= spawn_viewer(trace_path
);
420 /* Don't set ret so lttng can interpret the sessiond error. */
425 if (session_live_mode
) {
430 if (opt_session_name
== NULL
) {
438 * The 'view <options>' first level command
440 int cmd_view(int argc
, const char **argv
)
442 int opt
, ret
= CMD_SUCCESS
;
443 static poptContext pc
;
445 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
446 poptReadDefaultConfig(pc
, 0);
448 while ((opt
= poptGetNextOpt(pc
)) != -1) {
453 case OPT_LIST_OPTIONS
:
454 list_cmd_options(stdout
, long_options
);
463 opt_session_name
= (char*) poptGetArg(pc
);
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