13ebd6c3acff763b235bfc4748fab0404716c81c
[lttng-tools.git] / lttng / commands / disable_events.c
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; only version 2
7 * of the License.
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 "../conf.h"
30 #include "../utils.h"
31
32 static char *opt_event_list;
33 static char *opt_kernel;
34 static char *opt_channel_name;
35 static char *opt_session_name;
36 static int opt_pid_all;
37 static int opt_userspace;
38 static char *opt_cmd_name;
39 static int opt_disable_all;
40 static pid_t opt_pid;
41
42 enum {
43 OPT_HELP = 1,
44 OPT_USERSPACE,
45 };
46
47 static struct lttng_handle *handle;
48
49 static struct poptOption long_options[] = {
50 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
51 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
52 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
53 {"all-events", 'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
54 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
55 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
56 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
57 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
58 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
59 {0, 0, 0, 0, 0, 0, 0}
60 };
61
62 /*
63 * usage
64 */
65 static void usage(FILE *ofp)
66 {
67 fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
68 fprintf(ofp, "\n");
69 fprintf(ofp, " -h, --help Show this help\n");
70 fprintf(ofp, " -s, --session Apply on session name\n");
71 fprintf(ofp, " -c, --channel Apply on this channel\n");
72 fprintf(ofp, " -a, --all-events Enable all tracepoints\n");
73 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
74 fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
75 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
76 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
77 fprintf(ofp, "\n");
78 }
79
80 /*
81 * disable_events
82 *
83 * Disabling event using the lttng API.
84 */
85 static int disable_events(char *session_name)
86 {
87 int err, ret = CMD_SUCCESS;
88 char *event_name, *channel_name = NULL;
89 struct lttng_domain dom;
90
91 if (opt_channel_name == NULL) {
92 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
93 if (err < 0) {
94 ret = CMD_FATAL;
95 goto error;
96 }
97 } else {
98 channel_name = opt_channel_name;
99 }
100
101 if (opt_kernel) {
102 dom.type = LTTNG_DOMAIN_KERNEL;
103 }
104
105 handle = lttng_create_handle(session_name, &dom);
106 if (handle == NULL) {
107 ret = -1;
108 goto error;
109 }
110
111 if (opt_disable_all) {
112 if (opt_kernel) {
113 ret = lttng_disable_event(handle, NULL, channel_name);
114 goto error;
115 }
116
117 /* TODO: User-space tracer */
118 }
119
120 /* Strip event list */
121 event_name = strtok(opt_event_list, ",");
122 while (event_name != NULL) {
123 /* Kernel tracer action */
124 if (opt_kernel) {
125 DBG("Disabling kernel event %s for channel %s",
126 event_name, channel_name);
127
128 ret = lttng_disable_event(handle, event_name, channel_name);
129 if (ret < 0) {
130 MSG("Unable to disable event %s for channel %s",
131 event_name, channel_name);
132 } else {
133 MSG("Kernel event %s disabled for channel %s",
134 event_name, channel_name);
135 }
136 } else if (opt_userspace) { /* User-space tracer action */
137 /*
138 * TODO: Waiting on lttng UST 2.0
139 */
140 if (opt_pid_all) {
141 } else if (opt_pid != 0) {
142 }
143 ret = CMD_NOT_IMPLEMENTED;
144 goto error;
145 } else {
146 ERR("Please specify a tracer (--kernel or --userspace)");
147 goto error;
148 }
149
150 /* Next event */
151 event_name = strtok(NULL, ",");
152 }
153
154 error:
155 if (opt_channel_name == NULL) {
156 free(channel_name);
157 }
158 lttng_destroy_handle(handle);
159
160 return ret;
161 }
162
163 /*
164 * cmd_disable_events
165 *
166 * Disable event to trace session
167 */
168 int cmd_disable_events(int argc, const char **argv)
169 {
170 int opt, ret;
171 static poptContext pc;
172 char *session_name = NULL;
173
174 pc = poptGetContext(NULL, argc, argv, long_options, 0);
175 poptReadDefaultConfig(pc, 0);
176
177 while ((opt = poptGetNextOpt(pc)) != -1) {
178 switch (opt) {
179 case OPT_HELP:
180 usage(stderr);
181 ret = CMD_SUCCESS;
182 goto end;
183 case OPT_USERSPACE:
184 opt_userspace = 1;
185 break;
186 default:
187 usage(stderr);
188 ret = CMD_UNDEFINED;
189 goto end;
190 }
191 }
192
193 opt_event_list = (char*) poptGetArg(pc);
194 if (opt_event_list == NULL && opt_disable_all == 0) {
195 ERR("Missing event name(s).\n");
196 usage(stderr);
197 ret = CMD_SUCCESS;
198 goto end;
199 }
200
201 if (!opt_session_name) {
202 session_name = get_session_name();
203 if (session_name == NULL) {
204 ret = -1;
205 goto end;
206 }
207 } else {
208 session_name = opt_session_name;
209 }
210
211 ret = disable_events(session_name);
212
213 end:
214 return ret;
215 }
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