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
},
82 static void usage(FILE *ofp
)
84 fprintf(ofp
, "usage: lttng view [SESSION_NAME] [OPTIONS]\n");
86 fprintf(ofp
, "By default, the babeltrace viewer will be used for text viewing\n");
88 fprintf(ofp
, "Where SESSION_NAME is an optional session name. If not specified, lttng will\n");
89 fprintf(ofp
, "get it from the configuration file (.lttngrc).\n");
91 fprintf(ofp
, "Options:\n");
92 fprintf(ofp
, " -h, --help Show this help\n");
93 fprintf(ofp
, " --list-options Simple listing of options\n");
94 fprintf(ofp
, " -t, --trace-path PATH Trace directory path for the viewer\n");
95 fprintf(ofp
, " -e, --viewer CMD Specify viewer and/or options to use\n");
96 fprintf(ofp
, " This will completely override the default viewers so\n");
97 fprintf(ofp
, " please make sure to specify the full command. The trace\n");
98 fprintf(ofp
, " directory path of the session will be appended at the end\n");
99 fprintf(ofp
, " to the arguments\n");
103 static struct viewers
*parse_options(void)
105 if (opt_viewer
== NULL
) {
106 /* Default is babeltrace */
107 return &(viewers
[VIEWER_BABELTRACE
]);
111 if (strstr(opt_viewer
, viewers
[VIEWER_LTTV_GUI
].exec_name
) == 0) {
112 return &(viewers
[VIEWER_LTTV_GUI
]);
117 * This means that if -e, --viewers is used, we just override everything
118 * with it. For supported viewers like lttv, we could simply detect if "-t"
119 * is passed and if not, add the trace directory to it.
121 return &(viewers
[VIEWER_USER_DEFINED
]);
125 * Alloc an array of string pointer from a simple string having all options
126 * seperated by spaces. Also adds the trace path to the arguments.
128 * The returning pointer is ready to be passed to execvp().
130 static char **alloc_argv_from_user_opts(char *opts
, const char *trace_path
)
132 int i
= 0, ignore_space
= 0;
133 unsigned int num_opts
= 1;
134 char **argv
, *token
= opts
;
136 /* Count number of arguments. */
139 /* Use to ignore consecutive spaces */
148 } while (*token
!= '\0');
150 /* Add two here for the NULL terminating element and trace path */
151 argv
= malloc(sizeof(char *) * (num_opts
+ 2));
156 token
= strtok(opts
, " ");
157 while (token
!= NULL
) {
158 argv
[i
] = strdup(token
);
159 token
= strtok(NULL
, " ");
163 argv
[num_opts
] = (char *) trace_path
;
164 argv
[num_opts
+ 1] = NULL
;
173 * Alloc an array of string pointer from an array of strings. It also adds
174 * the trace path to the argv.
176 * The returning pointer is ready to be passed to execvp().
178 static char **alloc_argv_from_local_opts(const char **opts
, size_t opts_len
,
179 const char *trace_path
)
184 size
= sizeof(char *) * opts_len
;
186 /* Add two here for the trace_path and the NULL terminating element. */
187 argv
= malloc(size
+ 2);
192 memcpy(argv
, opts
, size
);
194 argv
[opts_len
] = (char *)trace_path
;
195 argv
[opts_len
+ 1] = NULL
;
202 * Spawn viewer with the trace directory path.
204 static int spawn_viewer(const char *trace_path
)
208 const char *viewer_bin
= NULL
;
209 struct viewers
*viewer
;
212 /* Check for --viewer options */
213 viewer
= parse_options();
214 if (viewer
== NULL
) {
219 switch (viewer
->type
) {
220 case VIEWER_BABELTRACE
:
221 if (stat(babeltrace_bin
, &status
) == 0) {
222 viewer_bin
= babeltrace_bin
;
224 viewer_bin
= viewer
->exec_name
;
226 argv
= alloc_argv_from_local_opts(babeltrace_opts
,
227 ARRAY_SIZE(babeltrace_opts
), trace_path
);
230 case VIEWER_LTTV_GUI
:
231 if (stat(lttv_gui_bin
, &status
) == 0) {
232 viewer_bin
= lttv_gui_bin
;
234 viewer_bin
= viewer
->exec_name
;
236 argv
= alloc_argv_from_local_opts(lttv_gui_opts
,
237 ARRAY_SIZE(lttv_gui_opts
), trace_path
);
240 case VIEWER_USER_DEFINED
:
241 argv
= alloc_argv_from_user_opts(opt_viewer
, trace_path
);
243 viewer_bin
= argv
[0];
247 viewer_bin
= viewers
[VIEWER_BABELTRACE
].exec_name
;
248 argv
= alloc_argv_from_local_opts(babeltrace_opts
,
249 ARRAY_SIZE(babeltrace_opts
), trace_path
);
258 DBG("Using %s viewer", viewer_bin
);
260 ret
= execvp(viewer_bin
, argv
);
262 if (errno
== ENOENT
) {
263 ERR("%s not found on the system", viewer_bin
);
265 PERROR("exec: %s", viewer_bin
);
277 * Exec viewer if found and use session name path.
279 static int view_trace(void)
282 char *session_name
, *trace_path
;
283 struct lttng_session
*sessions
= NULL
;
286 * Safety net. If lttng is suid at some point for *any* useless reasons,
287 * this prevent any bad execution of binaries.
290 if (getuid() != geteuid()) {
291 ERR("UID does not match effective UID.");
294 } else if (getgid() != getegid()) {
295 ERR("GID does not match effective GID.");
301 /* User define trace path override the session name */
302 if (opt_trace_path
) {
304 } else if(opt_session_name
== NULL
) {
305 session_name
= get_session_name();
306 if (session_name
== NULL
) {
311 session_name
= opt_session_name
;
314 DBG("Viewing trace for session %s", session_name
);
317 int i
, count
, found
= 0;
319 /* Getting all sessions */
320 count
= lttng_list_sessions(&sessions
);
322 ERR("Unable to list sessions. Session name %s not found.",
324 MSG("Is there a session daemon running?");
329 /* Find our session listed by the session daemon */
330 for (i
= 0; i
< count
; i
++) {
331 if (strncmp(sessions
[i
].name
, session_name
, NAME_MAX
) == 0) {
338 MSG("Session name %s not found", session_name
);
343 trace_path
= sessions
[i
].path
;
345 if (sessions
[i
].enabled
) {
346 WARN("Session %s is running. Please stop it before reading it.",
352 trace_path
= opt_trace_path
;
355 MSG("Trace directory: %s\n", trace_path
);
357 ret
= spawn_viewer(trace_path
);
359 /* Don't set ret so lttng can interpret the sessiond error. */
366 if (opt_session_name
== NULL
) {
374 * The 'view <options>' first level command
376 int cmd_view(int argc
, const char **argv
)
378 int opt
, ret
= CMD_SUCCESS
;
379 static poptContext pc
;
381 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
382 poptReadDefaultConfig(pc
, 0);
384 while ((opt
= poptGetNextOpt(pc
)) != -1) {
389 case OPT_LIST_OPTIONS
:
390 list_cmd_options(stdout
, long_options
);
399 opt_session_name
= (char*) poptGetArg(pc
);
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