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; only version 2
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>
29 #include "../command.h"
31 static char *opt_channels
;
32 static int opt_kernel
;
33 static char *opt_session_name
;
34 static int opt_userspace
;
35 static struct lttng_channel chan
;
37 /* Not implemented yet */
38 static char *opt_cmd_name
;
53 static struct lttng_handle
*handle
;
55 static struct poptOption long_options
[] = {
56 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
57 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
58 {"session", 's', POPT_ARG_STRING
, &opt_session_name
, 0, 0, 0},
59 {"kernel", 'k', POPT_ARG_VAL
, &opt_kernel
, 1, 0, 0},
61 /* Not implemented yet */
62 {"userspace", 'u', POPT_ARG_STRING
| POPT_ARGFLAG_OPTIONAL
, &opt_cmd_name
, OPT_USERSPACE
, 0, 0},
63 {"pid", 'p', POPT_ARG_INT
, &opt_pid
, 0, 0, 0},
65 {"userspace", 'u', POPT_ARG_NONE
, 0, OPT_USERSPACE
, 0, 0},
67 {"discard", 0, POPT_ARG_NONE
, 0, OPT_DISCARD
, 0, 0},
68 {"overwrite", 0, POPT_ARG_NONE
, 0, OPT_OVERWRITE
, 0, 0},
69 {"subbuf-size", 0, POPT_ARG_DOUBLE
, 0, OPT_SUBBUF_SIZE
, 0, 0},
70 {"num-subbuf", 0, POPT_ARG_INT
, 0, OPT_NUM_SUBBUF
, 0, 0},
71 {"switch-timer", 0, POPT_ARG_INT
, 0, OPT_SWITCH_TIMER
, 0, 0},
72 {"read-timer", 0, POPT_ARG_INT
, 0, OPT_READ_TIMER
, 0, 0},
79 static void usage(FILE *ofp
)
81 fprintf(ofp
, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
83 fprintf(ofp
, " -h, --help Show this help\n");
84 fprintf(ofp
, " -s, --session Apply on session name\n");
85 fprintf(ofp
, " -k, --kernel Apply on the kernel tracer\n");
87 fprintf(ofp
, " -u, --userspace [CMD] Apply for the user-space tracer\n");
88 fprintf(ofp
, " If no CMD, the domain used is UST global\n");
89 fprintf(ofp
, " or else the domain is UST EXEC_NAME\n");
90 fprintf(ofp
, " -p, --pid PID If -u, apply to specific PID (domain: UST PID)\n");
92 fprintf(ofp
, " -u, --userspace Apply for the user-space tracer\n");
95 fprintf(ofp
, "Channel options:\n");
96 fprintf(ofp
, " --discard Discard event when buffers are full%s\n",
97 DEFAULT_CHANNEL_OVERWRITE
? "" : " (default)");
98 fprintf(ofp
, " --overwrite Flight recorder mode%s\n",
99 DEFAULT_CHANNEL_OVERWRITE
? " (default)" : "");
100 fprintf(ofp
, " --subbuf-size Subbuffer size in bytes\n");
101 fprintf(ofp
, " (default: %u, kernel default: %u)\n",
102 DEFAULT_CHANNEL_SUBBUF_SIZE
,
103 DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
);
104 fprintf(ofp
, " --num-subbuf Number of subbufers\n");
105 fprintf(ofp
, " (default: %u, kernel default: %u)\n",
106 DEFAULT_CHANNEL_SUBBUF_NUM
,
107 DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
);
108 fprintf(ofp
, " --switch-timer Switch timer interval in usec (default: %u)\n",
109 DEFAULT_CHANNEL_SWITCH_TIMER
);
110 fprintf(ofp
, " --read-timer Read timer interval in usec (default: %u)\n",
111 DEFAULT_CHANNEL_READ_TIMER
);
116 * Set default attributes depending on those already defined from the command
119 static void set_default_attr(struct lttng_domain
*dom
)
121 struct lttng_channel_attr default_attr
;
124 lttng_channel_set_default_attr(dom
, &default_attr
);
126 if (chan
.attr
.overwrite
== -1) {
127 chan
.attr
.overwrite
= default_attr
.overwrite
;
129 if (chan
.attr
.subbuf_size
== -1) {
130 chan
.attr
.subbuf_size
= default_attr
.subbuf_size
;
132 if (chan
.attr
.num_subbuf
== -1) {
133 chan
.attr
.num_subbuf
= default_attr
.num_subbuf
;
135 if (chan
.attr
.switch_timer_interval
== -1) {
136 chan
.attr
.switch_timer_interval
= default_attr
.switch_timer_interval
;
138 if (chan
.attr
.read_timer_interval
== -1) {
139 chan
.attr
.read_timer_interval
= default_attr
.read_timer_interval
;
141 if (chan
.attr
.output
== -1) {
142 chan
.attr
.output
= default_attr
.output
;
147 * Adding channel using the lttng API.
149 static int enable_channel(char *session_name
)
151 int ret
= CMD_SUCCESS
;
153 struct lttng_domain dom
;
155 /* Create lttng domain */
157 dom
.type
= LTTNG_DOMAIN_KERNEL
;
158 } else if (opt_userspace
) {
159 dom
.type
= LTTNG_DOMAIN_UST
;
161 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
166 set_default_attr(&dom
);
168 handle
= lttng_create_handle(session_name
, &dom
);
169 if (handle
== NULL
) {
174 /* Strip channel list (format: chan1,chan2,...) */
175 channel_name
= strtok(opt_channels
, ",");
176 while (channel_name
!= NULL
) {
177 /* Copy channel name and normalize it */
178 strncpy(chan
.name
, channel_name
, NAME_MAX
);
179 chan
.name
[NAME_MAX
- 1] = '\0';
181 DBG("Enabling channel %s", channel_name
);
183 ret
= lttng_enable_channel(handle
, &chan
);
187 MSG("%s channel %s enabled for session %s",
188 opt_kernel
? "Kernel" : "UST", channel_name
,
193 channel_name
= strtok(NULL
, ",");
197 lttng_destroy_handle(handle
);
203 * Default value for channel configuration.
205 static void init_channel_config(void)
208 * Put -1 everywhere so we can identify those set by the command line and
209 * those needed to be set by the default values.
211 memset(&chan
.attr
, -1, sizeof(chan
.attr
));
215 * Add channel to trace session
217 int cmd_enable_channels(int argc
, const char **argv
)
220 static poptContext pc
;
221 char *session_name
= NULL
;
223 init_channel_config();
225 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
226 poptReadDefaultConfig(pc
, 0);
228 while ((opt
= poptGetNextOpt(pc
)) != -1) {
235 chan
.attr
.overwrite
= 0;
236 DBG("Channel set to discard");
239 chan
.attr
.overwrite
= 1;
240 DBG("Channel set to overwrite");
242 case OPT_SUBBUF_SIZE
:
243 chan
.attr
.subbuf_size
= atol(poptGetOptArg(pc
));
244 DBG("Channel subbuf size set to %" PRIu64
, chan
.attr
.subbuf_size
);
247 chan
.attr
.num_subbuf
= atoi(poptGetOptArg(pc
));
248 DBG("Channel subbuf num set to %" PRIu64
, chan
.attr
.num_subbuf
);
250 case OPT_SWITCH_TIMER
:
251 chan
.attr
.switch_timer_interval
= atoi(poptGetOptArg(pc
));
252 DBG("Channel switch timer interval set to %d", chan
.attr
.switch_timer_interval
);
255 chan
.attr
.read_timer_interval
= atoi(poptGetOptArg(pc
));
256 DBG("Channel read timer interval set to %d", chan
.attr
.read_timer_interval
);
268 opt_channels
= (char*) poptGetArg(pc
);
269 if (opt_channels
== NULL
) {
270 ERR("Missing channel name.\n");
276 if (!opt_session_name
) {
277 session_name
= get_session_name();
278 if (session_name
== NULL
) {
283 session_name
= opt_session_name
;
286 ret
= enable_channel(session_name
);