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>
32 static char *opt_channels
;
33 static char *opt_kernel
;
34 static char *opt_cmd_name
;
35 static char *opt_session_name
;
36 static int opt_pid_all
;
37 static int opt_userspace
;
39 static struct lttng_channel chan
;
52 static struct poptOption long_options
[] = {
53 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
54 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
55 {"session", 's', POPT_ARG_STRING
, &opt_session_name
, 0, 0, 0},
56 {"kernel", 'k', POPT_ARG_VAL
, &opt_kernel
, 1, 0, 0},
57 {"userspace", 'u', POPT_ARG_STRING
| POPT_ARGFLAG_OPTIONAL
, 0, OPT_USERSPACE
, 0, 0},
58 {"all", 0, POPT_ARG_VAL
, &opt_pid_all
, 1, 0, 0},
59 {"pid", 'p', POPT_ARG_INT
, &opt_pid
, 0, 0, 0},
60 {"discard", 0, POPT_ARG_NONE
, 0, OPT_DISCARD
, 0, 0},
61 {"overwrite", 0, POPT_ARG_NONE
, 0, OPT_OVERWRITE
, 0, 0},
62 {"subbuf_size", 0, POPT_ARG_DOUBLE
, 0, OPT_SUBBUF_SIZE
, 0, 0},
63 {"num_subbuf", 0, POPT_ARG_INT
, 0, OPT_NUM_SUBBUF
, 0, 0},
64 {"switch_timer", 0, POPT_ARG_INT
, 0, OPT_SWITCH_TIMER
, 0, 0},
65 {"read_timer", 0, POPT_ARG_INT
, 0, OPT_READ_TIMER
, 0, 0},
72 static void usage(FILE *ofp
)
74 fprintf(ofp
, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
76 fprintf(ofp
, " -h, --help Show this help\n");
77 fprintf(ofp
, " -s, --session Apply on session name\n");
78 fprintf(ofp
, " -k, --kernel Apply on the kernel tracer\n");
79 fprintf(ofp
, " -u, --userspace [CMD] Apply on the user-space tracer\n");
80 fprintf(ofp
, " --all If -u, apply on all traceable apps\n");
81 fprintf(ofp
, " -p, --pid PID If -u, apply on a specific PID\n");
83 fprintf(ofp
, "Channel options:\n");
84 fprintf(ofp
, " --discard Discard event when buffers are full (default)\n");
85 fprintf(ofp
, " --overwrite Flight recorder mode\n");
86 fprintf(ofp
, " --subbuf_size Subbuffer size in bytes (default: 4096)\n");
87 fprintf(ofp
, " --num_subbuf Number of subbufers (default: 2)\n");
88 fprintf(ofp
, " --switch_timer Switch timer interval in usec (default: 0)\n");
89 fprintf(ofp
, " --read_timer Read timer interval in usec (default: 200)\n");
96 * Adding channel using the lttng API.
98 static int enable_channel(void)
100 int ret
= CMD_SUCCESS
;
102 struct lttng_domain dom
;
104 if (set_session_name(opt_session_name
) < 0) {
110 dom
.type
= LTTNG_DOMAIN_KERNEL
;
113 /* Strip event list */
114 channel_name
= strtok(opt_channels
, ",");
115 while (channel_name
!= NULL
) {
116 /* Kernel tracer action */
118 DBG("Enabling kernel channel %s", channel_name
);
120 /* Copy channel name and normalize it */
121 strncpy(chan
.name
, channel_name
, NAME_MAX
);
122 chan
.name
[NAME_MAX
- 1] = '\0';
124 ret
= lttng_enable_channel(&dom
, &chan
);
128 MSG("Kernel channel enabled %s", channel_name
);
130 } else if (opt_userspace
) { /* User-space tracer action */
132 * TODO: Waiting on lttng UST 2.0
135 } else if (opt_pid
!= 0) {
137 ret
= CMD_NOT_IMPLEMENTED
;
140 ERR("Please specify a tracer (kernel or user-space)");
145 channel_name
= strtok(NULL
, ",");
153 * init_channel_config
155 * Default value for channel configuration.
157 static void init_channel_config(void)
159 chan
.attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
160 chan
.attr
.subbuf_size
= DEFAULT_CHANNEL_SUBBUF_SIZE
;
161 chan
.attr
.num_subbuf
= DEFAULT_CHANNEL_SUBBUF_NUM
;
162 chan
.attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
163 chan
.attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
164 chan
.attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
168 * Add channel to trace session
170 int cmd_enable_channels(int argc
, const char **argv
)
173 static poptContext pc
;
175 init_channel_config();
177 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
178 poptReadDefaultConfig(pc
, 0);
180 while ((opt
= poptGetNextOpt(pc
)) != -1) {
188 opt_cmd_name
= poptGetOptArg(pc
);
191 chan
.attr
.overwrite
= 0;
192 DBG("Channel set to discard");
195 chan
.attr
.overwrite
= 1;
196 DBG("Channel set to overwrite");
198 case OPT_SUBBUF_SIZE
:
199 chan
.attr
.subbuf_size
= atol(poptGetOptArg(pc
));
200 DBG("Channel subbuf size set to %lu", chan
.attr
.subbuf_size
);
203 chan
.attr
.num_subbuf
= atoi(poptGetOptArg(pc
));
204 DBG("Channel subbuf num set to %lu", chan
.attr
.num_subbuf
);
206 case OPT_SWITCH_TIMER
:
207 chan
.attr
.switch_timer_interval
= atoi(poptGetOptArg(pc
));
208 DBG("Channel switch timer interval set to %d", chan
.attr
.switch_timer_interval
);
211 chan
.attr
.read_timer_interval
= atoi(poptGetOptArg(pc
));
212 DBG("Channel read timer interval set to %d", chan
.attr
.read_timer_interval
);
221 opt_channels
= (char*) poptGetArg(pc
);
222 if (opt_channels
== NULL
) {
223 ERR("Missing channel name.\n");
229 ret
= enable_channel();