Major changes
[lttng-tools.git] / lttng / commands / enable_events.c
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DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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.
8 *
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.
13 *
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.
17 */
18
19#define _GNU_SOURCE
20#include <popt.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <sys/stat.h>
25#include <sys/types.h>
26#include <unistd.h>
27
28#include "cmd.h"
29#include "config.h"
30#include "utils.h"
31
32static char *opt_event_list;
33static int opt_event_type;
34static char *opt_kernel;
35static char *opt_cmd_name;
36static int opt_pid_all;
37static int opt_userspace;
38static int opt_enable_all;
39static pid_t opt_pid;
40static char *opt_kprobe_addr;
41static char *opt_function_symbol;
42static char *opt_channel_name;
43
44enum {
45 OPT_HELP = 1,
46 OPT_USERSPACE,
47 OPT_TRACEPOINT,
48 OPT_MARKER,
49 OPT_KPROBE,
50 OPT_FUNCTION,
51};
52
53static struct poptOption long_options[] = {
54 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
55 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
56 {"all-events", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
57 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
58 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
59 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
60 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
61 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
62 {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
63 {"marker", 0, POPT_ARG_NONE, 0, OPT_MARKER, 0, 0},
64 {"kprobe", 0, POPT_ARG_STRING, 0, OPT_KPROBE, 0, 0},
65 {"function", 0, POPT_ARG_STRING, 0, OPT_FUNCTION, 0, 0},
66 {0, 0, 0, 0, 0, 0, 0}
67};
68
69/*
70 * usage
71 */
72static void usage(FILE *ofp)
73{
74 fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
75 fprintf(ofp, "\n");
76 fprintf(ofp, " -h, --help Show this help\n");
77 fprintf(ofp, " -c, --channel Apply on this channel\n");
78 fprintf(ofp, " -a, --all-events Enable all tracepoints\n");
79 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
80 fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
81 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
82 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
83 fprintf(ofp, "\n");
84 fprintf(ofp, "Event options:\n");
85 fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
86 fprintf(ofp, " --kprobe ADDR Kernel Kprobe\n");
87 fprintf(ofp, " --function SYMBOL Function tracer event\n");
88 fprintf(ofp, " --marker User-space marker (deprecated)\n");
89 fprintf(ofp, "\n");
90}
91
92/*
93 * enable_events
94 *
95 * Enabling event using the lttng API.
96 */
97static int enable_events(void)
98{
99 int err, ret = CMD_SUCCESS;
100 char *event_name, *channel_name;
101 struct lttng_event ev;
102
103 if (set_session_name() < 0) {
104 ret = CMD_ERROR;
105 goto error;
106 }
107
108 if (opt_channel_name == NULL) {
109 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
110 if (err < 0) {
111 ret = CMD_FATAL;
112 goto error;
113 }
114 } else {
115 channel_name = opt_channel_name;
116 }
117
118 if (opt_enable_all) {
119 if (opt_kernel) {
120 ret = lttng_kernel_enable_event(NULL, channel_name);
121 goto error;
122 }
123
124 /* TODO: User-space tracer */
125 }
126
127 /* Strip event list */
128 event_name = strtok(opt_event_list, ",");
129 while (event_name != NULL) {
130 /* Kernel tracer action */
131 if (opt_kernel) {
132 DBG("Enabling kernel event %s for channel %s",
133 event_name, channel_name);
134 /* Copy name and type of the event */
135 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
136 ev.type = opt_event_type;
137
138 switch (opt_event_type) {
139 case LTTNG_EVENT_TRACEPOINTS:
140 ret = lttng_kernel_enable_event(&ev, channel_name);
141 break;
142 case LTTNG_EVENT_KPROBES:
143 /* FIXME: check addr format */
144 ev.attr.kprobe.addr = atoll(opt_kprobe_addr);
145 ret = lttng_kernel_enable_event(&ev, channel_name);
146 break;
147 case LTTNG_EVENT_FUNCTION:
148 strncpy(ev.attr.ftrace.symbol_name, opt_function_symbol, LTTNG_SYMBOL_NAME_LEN);
149 ret = lttng_kernel_enable_event(&ev, channel_name);
150 break;
151 default:
152 ret = CMD_NOT_IMPLEMENTED;
153 goto error;
154 }
155
156 if (ret > 0) {
157 MSG("Kernel event %s created in channel %s", event_name, channel_name);
158 }
159 } else if (opt_userspace) { /* User-space tracer action */
160 /*
161 * TODO: Waiting on lttng UST 2.0
162 */
163 if (opt_pid_all) {
164 } else if (opt_pid != 0) {
165 }
166 ret = CMD_NOT_IMPLEMENTED;
167 goto error;
168 } else {
169 ERR("Please specify a tracer (kernel or user-space)");
170 goto error;
171 }
172
173 /* Next event */
174 event_name = strtok(NULL, ",");
175 }
176
177error:
178 return ret;
179}
180
181/*
182 * cmd_enable_events
183 *
184 * Add event to trace session
185 */
186int cmd_enable_events(int argc, const char **argv)
187{
188 int opt, ret;
189 static poptContext pc;
190
191 pc = poptGetContext(NULL, argc, argv, long_options, 0);
192 poptReadDefaultConfig(pc, 0);
193
194 /* Default event type */
195 opt_event_type = LTTNG_KERNEL_TRACEPOINTS;
196
197 while ((opt = poptGetNextOpt(pc)) != -1) {
198 switch (opt) {
199 case OPT_HELP:
200 usage(stderr);
201 ret = CMD_SUCCESS;
202 goto end;
203 case OPT_USERSPACE:
204 opt_userspace = 1;
205 opt_cmd_name = poptGetOptArg(pc);
206 break;
207 case OPT_TRACEPOINT:
208 opt_event_type = LTTNG_EVENT_TRACEPOINTS;
209 break;
210 case OPT_MARKER:
211 ret = CMD_NOT_IMPLEMENTED;
212 goto end;
213 case OPT_KPROBE:
214 opt_event_type = LTTNG_EVENT_KPROBES;
215 opt_kprobe_addr = poptGetOptArg(pc);
216 break;
217 case OPT_FUNCTION:
218 opt_event_type = LTTNG_EVENT_FUNCTION;
219 opt_function_symbol = poptGetOptArg(pc);
220 break;
221 default:
222 usage(stderr);
223 ret = CMD_UNDEFINED;
224 goto end;
225 }
226 }
227
228 opt_event_list = (char*) poptGetArg(pc);
229 if (opt_event_list == NULL && opt_enable_all == 0) {
230 ERR("Missing event name(s).\n");
231 usage(stderr);
232 ret = CMD_SUCCESS;
233 goto end;
234 }
235
236 ret = enable_events();
237
238end:
239 return ret;
240}
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