2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <sys/types.h>
32 static char *opt_event_list
;
33 static int opt_event_type
;
34 static char *opt_kernel
;
35 static char *opt_cmd_name
;
36 static char *opt_session_name
;
37 static int opt_pid_all
;
38 static int opt_userspace
;
39 static int opt_enable_all
;
41 static char *opt_kprobe
;
42 static char *opt_function_symbol
;
43 static char *opt_channel_name
;
54 static struct poptOption long_options
[] = {
55 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
56 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
57 {"session", 's', POPT_ARG_STRING
, &opt_session_name
, 0, 0, 0},
58 {"all-events", 'a', POPT_ARG_VAL
, &opt_enable_all
, 1, 0, 0},
59 {"channel", 'c', POPT_ARG_STRING
, &opt_channel_name
, 0, 0, 0},
60 {"kernel", 'k', POPT_ARG_VAL
, &opt_kernel
, 1, 0, 0},
61 {"userspace", 'u', POPT_ARG_STRING
| POPT_ARGFLAG_OPTIONAL
, 0, OPT_USERSPACE
, 0, 0},
62 {"all", 0, POPT_ARG_VAL
, &opt_pid_all
, 1, 0, 0},
63 {"pid", 'p', POPT_ARG_INT
, &opt_pid
, 0, 0, 0},
64 {"tracepoint", 0, POPT_ARG_NONE
, 0, OPT_TRACEPOINT
, 0, 0},
65 {"marker", 0, POPT_ARG_NONE
, 0, OPT_MARKER
, 0, 0},
66 {"kprobe", 0, POPT_ARG_STRING
, 0, OPT_KPROBE
, 0, 0},
67 {"function", 0, POPT_ARG_STRING
, 0, OPT_FUNCTION
, 0, 0},
74 static void usage(FILE *ofp
)
76 fprintf(ofp
, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
78 fprintf(ofp
, " -h, --help Show this help\n");
79 fprintf(ofp
, " -s, --session Apply on session name\n");
80 fprintf(ofp
, " -c, --channel Apply on this channel\n");
81 fprintf(ofp
, " -a, --all-events Enable all tracepoints\n");
82 fprintf(ofp
, " -k, --kernel Apply for the kernel tracer\n");
83 fprintf(ofp
, " -u, --userspace [CMD] Apply for the user-space tracer\n");
84 fprintf(ofp
, " --all If -u, apply on all traceable apps\n");
85 fprintf(ofp
, " -p, --pid PID If -u, apply on a specific PID\n");
87 fprintf(ofp
, "Event options:\n");
88 fprintf(ofp
, " --tracepoint Tracepoint event (default)\n");
89 fprintf(ofp
, " --kprobe [addr | symbol+offset]\n");
90 fprintf(ofp
, " Kernel Kprobe. (addr or offset can be base 8,10 and 16)\n");
91 fprintf(ofp
, " --function SYMBOL Function tracer event\n");
92 fprintf(ofp
, " --marker User-space marker (deprecated)\n");
99 * Parse kprobe options.
101 static int parse_kprobe_opts(struct lttng_event
*ev
, char *opt
)
105 char name
[LTTNG_SYMBOL_NAME_LEN
];
112 /* Check for symbol+offset */
113 ret
= sscanf(opt
, "%[^'+']+%li", name
, &hex
);
115 strncpy(ev
->attr
.kprobe
.symbol_name
, name
, LTTNG_SYMBOL_NAME_LEN
);
116 DBG("kprobe symbol %s", ev
->attr
.kprobe
.symbol_name
);
118 ERR("Invalid kprobe offset %lu", hex
);
122 ev
->attr
.kprobe
.offset
= hex
;
123 DBG("kprobe offset %lu", ev
->attr
.kprobe
.offset
);
127 /* Check for address */
128 ret
= sscanf(opt
, "%li", &hex
);
131 ERR("Invalid kprobe address %lu", hex
);
135 ev
->attr
.kprobe
.addr
= hex
;
136 DBG("kprobe addr %lu", ev
->attr
.kprobe
.addr
);
150 * Enabling event using the lttng API.
152 static int enable_events(void)
154 int err
, ret
= CMD_SUCCESS
;
155 char *event_name
, *channel_name
= NULL
;
156 struct lttng_event ev
;
158 if (set_session_name(opt_session_name
) < 0) {
163 if (opt_channel_name
== NULL
) {
164 err
= asprintf(&channel_name
, DEFAULT_CHANNEL_NAME
);
170 channel_name
= opt_channel_name
;
173 if (opt_enable_all
) {
175 ret
= lttng_kernel_enable_event(NULL
, channel_name
);
179 /* TODO: User-space tracer */
182 /* Strip event list */
183 event_name
= strtok(opt_event_list
, ",");
184 while (event_name
!= NULL
) {
185 /* Kernel tracer action */
187 DBG("Enabling kernel event %s for channel %s",
188 event_name
, channel_name
);
189 /* Copy name and type of the event */
190 strncpy(ev
.name
, event_name
, LTTNG_SYMBOL_NAME_LEN
);
191 ev
.type
= opt_event_type
;
193 switch (opt_event_type
) {
194 case LTTNG_EVENT_TRACEPOINT
:
195 ret
= lttng_kernel_enable_event(&ev
, channel_name
);
197 ERR("Unable to find event %s", ev
.name
);
200 case LTTNG_EVENT_KPROBE
:
201 ret
= parse_kprobe_opts(&ev
, opt_kprobe
);
203 ERR("Unable to parse kprobe options");
208 ret
= lttng_kernel_enable_event(&ev
, channel_name
);
210 case LTTNG_EVENT_FUNCTION
:
211 strncpy(ev
.attr
.ftrace
.symbol_name
, opt_function_symbol
, LTTNG_SYMBOL_NAME_LEN
);
212 ret
= lttng_kernel_enable_event(&ev
, channel_name
);
215 ret
= CMD_NOT_IMPLEMENTED
;
220 MSG("Kernel event %s created in channel %s", event_name
, channel_name
);
222 } else if (opt_userspace
) { /* User-space tracer action */
224 * TODO: Waiting on lttng UST 2.0
227 } else if (opt_pid
!= 0) {
229 ret
= CMD_NOT_IMPLEMENTED
;
232 ERR("Please specify a tracer (kernel or user-space)");
237 event_name
= strtok(NULL
, ",");
241 if (opt_channel_name
== NULL
) {
250 * Add event to trace session
252 int cmd_enable_events(int argc
, const char **argv
)
255 static poptContext pc
;
257 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
258 poptReadDefaultConfig(pc
, 0);
260 /* Default event type */
261 opt_event_type
= LTTNG_EVENT_TRACEPOINT
;
263 while ((opt
= poptGetNextOpt(pc
)) != -1) {
271 opt_cmd_name
= poptGetOptArg(pc
);
274 opt_event_type
= LTTNG_EVENT_TRACEPOINT
;
277 ret
= CMD_NOT_IMPLEMENTED
;
280 opt_event_type
= LTTNG_EVENT_KPROBE
;
281 opt_kprobe
= poptGetOptArg(pc
);
284 opt_event_type
= LTTNG_EVENT_FUNCTION
;
285 opt_function_symbol
= poptGetOptArg(pc
);
294 opt_event_list
= (char*) poptGetArg(pc
);
295 if (opt_event_list
== NULL
&& opt_enable_all
== 0) {
296 ERR("Missing event name(s).\n");
302 ret
= enable_events();
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