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>
33 static char *opt_channels
;
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
;
40 static struct lttng_channel chan
;
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},
60 {"userspace", 'u', POPT_ARG_STRING
| POPT_ARGFLAG_OPTIONAL
, 0, OPT_USERSPACE
, 0, 0},
61 {"all", 0, POPT_ARG_VAL
, &opt_pid_all
, 1, 0, 0},
62 {"pid", 'p', POPT_ARG_INT
, &opt_pid
, 0, 0, 0},
63 {"discard", 0, POPT_ARG_NONE
, 0, OPT_DISCARD
, 0, 0},
64 {"overwrite", 0, POPT_ARG_NONE
, 0, OPT_OVERWRITE
, 0, 0},
65 {"subbuf-size", 0, POPT_ARG_DOUBLE
, 0, OPT_SUBBUF_SIZE
, 0, 0},
66 {"num-subbuf", 0, POPT_ARG_INT
, 0, OPT_NUM_SUBBUF
, 0, 0},
67 {"switch-timer", 0, POPT_ARG_INT
, 0, OPT_SWITCH_TIMER
, 0, 0},
68 {"read-timer", 0, POPT_ARG_INT
, 0, OPT_READ_TIMER
, 0, 0},
75 static void usage(FILE *ofp
)
77 fprintf(ofp
, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
79 fprintf(ofp
, " -h, --help Show this help\n");
80 fprintf(ofp
, " -s, --session Apply on session name\n");
81 fprintf(ofp
, " -k, --kernel Apply on the kernel tracer\n");
82 fprintf(ofp
, " -u, --userspace [CMD] Apply on the user-space tracer\n");
83 fprintf(ofp
, " --all If -u, apply on all traceable apps\n");
84 fprintf(ofp
, " -p, --pid PID If -u, apply on a specific PID\n");
86 fprintf(ofp
, "Channel options:\n");
87 fprintf(ofp
, " --discard Discard event when buffers are full (default)\n");
88 fprintf(ofp
, " --overwrite Flight recorder mode\n");
89 fprintf(ofp
, " --subbuf-size Subbuffer size in bytes (default: 4096)\n");
90 fprintf(ofp
, " --num-subbuf Number of subbufers (default: 2)\n");
91 fprintf(ofp
, " --switch-timer Switch timer interval in usec (default: 0)\n");
92 fprintf(ofp
, " --read-timer Read timer interval in usec (default: 200)\n");
99 * Adding channel using the lttng API.
101 static int enable_channel(char *session_name
)
103 int ret
= CMD_SUCCESS
;
105 struct lttng_domain dom
;
108 dom
.type
= LTTNG_DOMAIN_KERNEL
;
111 handle
= lttng_create_handle(session_name
, &dom
);
112 if (handle
== NULL
) {
117 /* Strip event list */
118 channel_name
= strtok(opt_channels
, ",");
119 while (channel_name
!= NULL
) {
120 /* Kernel tracer action */
122 DBG("Enabling kernel channel %s", channel_name
);
124 /* Copy channel name and normalize it */
125 strncpy(chan
.name
, channel_name
, NAME_MAX
);
126 chan
.name
[NAME_MAX
- 1] = '\0';
128 ret
= lttng_enable_channel(handle
, &chan
);
132 MSG("Kernel channel enabled %s", channel_name
);
134 } else if (opt_userspace
) { /* User-space tracer action */
136 * TODO: Waiting on lttng UST 2.0
139 } else if (opt_pid
!= 0) {
141 ret
= CMD_NOT_IMPLEMENTED
;
144 ERR("Please specify a tracer (--kernel or --userspace)");
149 channel_name
= strtok(NULL
, ",");
153 lttng_destroy_handle(handle
);
159 * init_channel_config
161 * Default value for channel configuration.
163 static void init_channel_config(void)
165 chan
.attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
166 chan
.attr
.subbuf_size
= DEFAULT_CHANNEL_SUBBUF_SIZE
;
167 chan
.attr
.num_subbuf
= DEFAULT_CHANNEL_SUBBUF_NUM
;
168 chan
.attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
169 chan
.attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
170 chan
.attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
174 * Add channel to trace session
176 int cmd_enable_channels(int argc
, const char **argv
)
179 static poptContext pc
;
180 char *session_name
= NULL
;
182 init_channel_config();
184 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
185 poptReadDefaultConfig(pc
, 0);
187 while ((opt
= poptGetNextOpt(pc
)) != -1) {
195 opt_cmd_name
= poptGetOptArg(pc
);
198 chan
.attr
.overwrite
= 0;
199 DBG("Channel set to discard");
202 chan
.attr
.overwrite
= 1;
203 DBG("Channel set to overwrite");
205 case OPT_SUBBUF_SIZE
:
206 chan
.attr
.subbuf_size
= atol(poptGetOptArg(pc
));
207 DBG("Channel subbuf size set to %" PRIu64
, chan
.attr
.subbuf_size
);
210 chan
.attr
.num_subbuf
= atoi(poptGetOptArg(pc
));
211 DBG("Channel subbuf num set to %" PRIu64
, chan
.attr
.num_subbuf
);
213 case OPT_SWITCH_TIMER
:
214 chan
.attr
.switch_timer_interval
= atoi(poptGetOptArg(pc
));
215 DBG("Channel switch timer interval set to %d", chan
.attr
.switch_timer_interval
);
218 chan
.attr
.read_timer_interval
= atoi(poptGetOptArg(pc
));
219 DBG("Channel read timer interval set to %d", chan
.attr
.read_timer_interval
);
228 opt_channels
= (char*) poptGetArg(pc
);
229 if (opt_channels
== NULL
) {
230 ERR("Missing channel name.\n");
236 if (!opt_session_name
) {
237 session_name
= get_session_name();
238 if (session_name
== NULL
) {
243 session_name
= opt_session_name
;
246 ret
= enable_channel(session_name
);