Rename cmd.h for command.h
[lttng-tools.git] / src / bin / 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 "../command.h"
29
30 static char *opt_event_list;
31 static int opt_kernel;
32 static char *opt_channel_name;
33 static char *opt_session_name;
34 static int opt_userspace;
35 static char *opt_cmd_name;
36 static int opt_disable_all;
37 static pid_t opt_pid;
38
39 enum {
40 OPT_HELP = 1,
41 OPT_USERSPACE,
42 };
43
44 static struct lttng_handle *handle;
45
46 static struct poptOption long_options[] = {
47 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
48 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
49 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
50 {"all-events", 'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
51 {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
52 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
53 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
54 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
55 {0, 0, 0, 0, 0, 0, 0}
56 };
57
58 /*
59 * usage
60 */
61 static void usage(FILE *ofp)
62 {
63 fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] [options]\n");
64 fprintf(ofp, "\n");
65 fprintf(ofp, " -h, --help Show this help\n");
66 fprintf(ofp, " -s, --session Apply on session name\n");
67 fprintf(ofp, " -c, --channel Apply on this channel\n");
68 fprintf(ofp, " -a, --all-events Disable all tracepoints\n");
69 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
70 fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
71 fprintf(ofp, " If no CMD, the domain used is UST global\n");
72 fprintf(ofp, " or else the domain is UST EXEC_NAME\n");
73 fprintf(ofp, " -p, --pid PID If -u, apply to specific PID (domain: UST PID)\n");
74 fprintf(ofp, "\n");
75 }
76
77 /*
78 * disable_events
79 *
80 * Disabling event using the lttng API.
81 */
82 static int disable_events(char *session_name)
83 {
84 int err, ret = CMD_SUCCESS;
85 char *event_name, *channel_name = NULL;
86 struct lttng_domain dom;
87
88 if (opt_channel_name == NULL) {
89 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
90 if (err < 0) {
91 ret = CMD_FATAL;
92 goto error;
93 }
94 } else {
95 channel_name = opt_channel_name;
96 }
97
98 if (opt_kernel && opt_userspace) {
99 ERR("Can't use -k/--kernel and -u/--userspace together");
100 ret = CMD_FATAL;
101 goto error;
102 }
103
104 if (opt_kernel) {
105 dom.type = LTTNG_DOMAIN_KERNEL;
106 } else if (opt_pid != 0) {
107 dom.type = LTTNG_DOMAIN_UST_PID;
108 dom.attr.pid = opt_pid;
109 DBG("PID %d set to lttng handle", opt_pid);
110 } else if (opt_userspace && opt_cmd_name == NULL) {
111 dom.type = LTTNG_DOMAIN_UST;
112 DBG("UST global domain selected");
113 } else if (opt_userspace && opt_cmd_name != NULL) {
114 dom.type = LTTNG_DOMAIN_UST_EXEC_NAME;
115 strncpy(dom.attr.exec_name, opt_cmd_name, NAME_MAX);
116 dom.attr.exec_name[NAME_MAX - 1] = '\0';
117 } else {
118 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
119 ret = CMD_NOT_IMPLEMENTED;
120 goto error;
121 }
122
123 handle = lttng_create_handle(session_name, &dom);
124 if (handle == NULL) {
125 ret = -1;
126 goto error;
127 }
128
129 if (opt_disable_all) {
130 ret = lttng_disable_event(handle, NULL, channel_name);
131 if (ret < 0) {
132 goto error;
133 }
134
135 MSG("All %s events are disabled in channel %s",
136 opt_kernel ? "kernel" : "UST", channel_name);
137 goto end;
138 }
139
140 /* Strip event list */
141 event_name = strtok(opt_event_list, ",");
142 while (event_name != NULL) {
143 /* Kernel tracer action */
144 if (opt_kernel) {
145 DBG("Disabling kernel event %s in channel %s",
146 event_name, channel_name);
147 } else if (opt_userspace) { /* User-space tracer action */
148 if (opt_cmd_name != NULL || opt_pid) {
149 MSG("Only supporting tracing all UST processes (-u) for now.");
150 ret = CMD_NOT_IMPLEMENTED;
151 goto error;
152 }
153 DBG("Disabling UST event %s in channel %s",
154 event_name, channel_name);
155 } else {
156 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
157 goto error;
158 }
159
160 ret = lttng_disable_event(handle, event_name, channel_name);
161 if (ret < 0) {
162 MSG("Unable to disable %s event %s in channel %s",
163 opt_kernel ? "kernel" : "UST", event_name,
164 channel_name);
165 } else {
166 MSG("%s event %s disabled in channel %s",
167 opt_kernel ? "kernel" : "UST", event_name,
168 channel_name);
169 }
170
171 /* Next event */
172 event_name = strtok(NULL, ",");
173 }
174
175 end:
176 error:
177 if (opt_channel_name == NULL) {
178 free(channel_name);
179 }
180 lttng_destroy_handle(handle);
181
182 return ret;
183 }
184
185 /*
186 * cmd_disable_events
187 *
188 * Disable event to trace session
189 */
190 int cmd_disable_events(int argc, const char **argv)
191 {
192 int opt, ret;
193 static poptContext pc;
194 char *session_name = NULL;
195
196 pc = poptGetContext(NULL, argc, argv, long_options, 0);
197 poptReadDefaultConfig(pc, 0);
198
199 while ((opt = poptGetNextOpt(pc)) != -1) {
200 switch (opt) {
201 case OPT_HELP:
202 usage(stderr);
203 ret = CMD_SUCCESS;
204 goto end;
205 case OPT_USERSPACE:
206 opt_userspace = 1;
207 break;
208 default:
209 usage(stderr);
210 ret = CMD_UNDEFINED;
211 goto end;
212 }
213 }
214
215 opt_event_list = (char*) poptGetArg(pc);
216 if (opt_event_list == NULL && opt_disable_all == 0) {
217 ERR("Missing event name(s).\n");
218 usage(stderr);
219 ret = CMD_SUCCESS;
220 goto end;
221 }
222
223 if (!opt_session_name) {
224 session_name = get_session_name();
225 if (session_name == NULL) {
226 ret = -1;
227 goto end;
228 }
229 } else {
230 session_name = opt_session_name;
231 }
232
233 ret = disable_events(session_name);
234
235 end:
236 return ret;
237 }
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