ae3913f915bae999d66461fc326b70687d65b42c
[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_cmd_name;
35 static char *opt_channel_name;
36 static char *opt_session_name;
37 static int opt_pid_all;
38 static int opt_userspace;
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 poptOption long_options[] = {
48 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
49 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
50 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
51 {"all-events", 'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
52 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
53 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
54 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
55 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
56 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
57 {0, 0, 0, 0, 0, 0, 0}
58 };
59
60 /*
61 * usage
62 */
63 static void usage(FILE *ofp)
64 {
65 fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
66 fprintf(ofp, "\n");
67 fprintf(ofp, " -h, --help Show this help\n");
68 fprintf(ofp, " -s, --session Apply on session name\n");
69 fprintf(ofp, " -c, --channel Apply on this channel\n");
70 fprintf(ofp, " -a, --all-events Enable all tracepoints\n");
71 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
72 fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
73 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
74 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
75 fprintf(ofp, "\n");
76 }
77
78 /*
79 * disable_events
80 *
81 * Disabling event using the lttng API.
82 */
83 static int disable_events(void)
84 {
85 int err, ret = CMD_SUCCESS;
86 char *event_name, *channel_name = NULL;
87 struct lttng_event ev;
88 struct lttng_domain dom;
89
90 if (set_session_name(opt_session_name) < 0) {
91 ret = CMD_ERROR;
92 goto error;
93 }
94
95 if (opt_channel_name == NULL) {
96 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
97 if (err < 0) {
98 ret = CMD_FATAL;
99 goto error;
100 }
101 } else {
102 channel_name = opt_channel_name;
103 }
104
105 if (opt_kernel) {
106 dom.type = LTTNG_DOMAIN_KERNEL;
107 }
108
109 if (opt_disable_all) {
110 if (opt_kernel) {
111 ret = lttng_disable_event(&dom, NULL, channel_name);
112 goto error;
113 }
114
115 /* TODO: User-space tracer */
116 }
117
118 /* Strip event list */
119 event_name = strtok(opt_event_list, ",");
120 while (event_name != NULL) {
121 /* Kernel tracer action */
122 if (opt_kernel) {
123 DBG("Disabling kernel event %s for channel %s",
124 event_name, channel_name);
125
126 /* Copy name and type of the event */
127 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
128 ret = lttng_disable_event(&dom, 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 user-space)");
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 return ret;
159 }
160
161 /*
162 * cmd_disable_events
163 *
164 * Disable event to trace session
165 */
166 int cmd_disable_events(int argc, const char **argv)
167 {
168 int opt, ret;
169 static poptContext pc;
170
171 pc = poptGetContext(NULL, argc, argv, long_options, 0);
172 poptReadDefaultConfig(pc, 0);
173
174 while ((opt = poptGetNextOpt(pc)) != -1) {
175 switch (opt) {
176 case OPT_HELP:
177 usage(stderr);
178 ret = CMD_SUCCESS;
179 goto end;
180 case OPT_USERSPACE:
181 opt_userspace = 1;
182 opt_cmd_name = poptGetOptArg(pc);
183 break;
184 default:
185 usage(stderr);
186 ret = CMD_UNDEFINED;
187 goto end;
188 }
189 }
190
191 opt_event_list = (char*) poptGetArg(pc);
192 if (opt_event_list == NULL && opt_disable_all == 0) {
193 ERR("Missing event name(s).\n");
194 usage(stderr);
195 ret = CMD_SUCCESS;
196 goto end;
197 }
198
199 ret = disable_events();
200
201 end:
202 return ret;
203 }
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