kconsumerd: fix infinite loop in splice handling of subbuf larger than 4k
[lttng-tools.git] / lttng / commands / enable_channels.c
CommitLineData
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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
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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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>
5a0de755 27#include <inttypes.h>
d36b8583 28
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29#include "../cmd.h"
30#include "../conf.h"
31#include "../utils.h"
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32
33static char *opt_channels;
34static char *opt_kernel;
7d29a247 35static char *opt_cmd_name;
5440dc42 36static char *opt_session_name;
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37static int opt_pid_all;
38static int opt_userspace;
39static pid_t opt_pid;
7d29a247 40static struct lttng_channel chan;
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41
42enum {
43 OPT_HELP = 1,
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44 OPT_DISCARD,
45 OPT_OVERWRITE,
46 OPT_SUBBUF_SIZE,
47 OPT_NUM_SUBBUF,
48 OPT_SWITCH_TIMER,
49 OPT_READ_TIMER,
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50 OPT_USERSPACE,
51};
52
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53static struct lttng_handle *handle;
54
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55static struct poptOption long_options[] = {
56 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
57 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42 58 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
d36b8583 59 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
7d29a247 60 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
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61 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
62 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
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63 {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
64 {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
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65 {"subbuf-size", 0, POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
66 {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
67 {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
68 {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
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69 {0, 0, 0, 0, 0, 0, 0}
70};
71
72/*
73 * usage
74 */
75static void usage(FILE *ofp)
76{
7d29a247 77 fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
d36b8583 78 fprintf(ofp, "\n");
7d29a247 79 fprintf(ofp, " -h, --help Show this help\n");
5440dc42 80 fprintf(ofp, " -s, --session Apply on session name\n");
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81 fprintf(ofp, " -k, --kernel Apply on the kernel tracer\n");
82 fprintf(ofp, " -u, --userspace [CMD] Apply on the user-space tracer\n");
83 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
84 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
85 fprintf(ofp, "\n");
86 fprintf(ofp, "Channel options:\n");
87 fprintf(ofp, " --discard Discard event when buffers are full (default)\n");
88 fprintf(ofp, " --overwrite Flight recorder mode\n");
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89 fprintf(ofp, " --subbuf-size Subbuffer size in bytes (default: 4096)\n");
90 fprintf(ofp, " --num-subbuf Number of subbufers (default: 2)\n");
91 fprintf(ofp, " --switch-timer Switch timer interval in usec (default: 0)\n");
92 fprintf(ofp, " --read-timer Read timer interval in usec (default: 200)\n");
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93 fprintf(ofp, "\n");
94}
95
96/*
7d29a247 97 * enable_channel
d36b8583 98 *
7d29a247 99 * Adding channel using the lttng API.
d36b8583 100 */
cd80958d 101static int enable_channel(char *session_name)
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102{
103 int ret = CMD_SUCCESS;
104 char *channel_name;
7d29a247 105 struct lttng_domain dom;
d36b8583 106
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107 if (opt_kernel) {
108 dom.type = LTTNG_DOMAIN_KERNEL;
109 }
110
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111 handle = lttng_create_handle(session_name, &dom);
112 if (handle == NULL) {
113 ret = -1;
114 goto error;
115 }
116
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117 /* Strip event list */
118 channel_name = strtok(opt_channels, ",");
119 while (channel_name != NULL) {
120 /* Kernel tracer action */
121 if (opt_kernel) {
122 DBG("Enabling kernel channel %s", channel_name);
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123
124 /* Copy channel name and normalize it */
125 strncpy(chan.name, channel_name, NAME_MAX);
126 chan.name[NAME_MAX - 1] = '\0';
127
cd80958d 128 ret = lttng_enable_channel(handle, &chan);
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129 if (ret < 0) {
130 goto error;
131 } else {
132 MSG("Kernel channel enabled %s", channel_name);
133 }
134 } else if (opt_userspace) { /* User-space tracer action */
135 /*
136 * TODO: Waiting on lttng UST 2.0
137 */
138 if (opt_pid_all) {
139 } else if (opt_pid != 0) {
140 }
141 ret = CMD_NOT_IMPLEMENTED;
142 goto error;
143 } else {
048e2159 144 ERR("Please specify a tracer (--kernel or --userspace)");
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145 goto error;
146 }
147
148 /* Next event */
149 channel_name = strtok(NULL, ",");
150 }
151
152error:
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153 lttng_destroy_handle(handle);
154
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155 return ret;
156}
157
158/*
7d29a247 159 * init_channel_config
d36b8583 160 *
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161 * Default value for channel configuration.
162 */
163static void init_channel_config(void)
164{
165 chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
166 chan.attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
167 chan.attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
168 chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
169 chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
170 chan.attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
171}
172
173/*
174 * Add channel to trace session
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175 */
176int cmd_enable_channels(int argc, const char **argv)
177{
178 int opt, ret;
179 static poptContext pc;
cd80958d 180 char *session_name = NULL;
d36b8583 181
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182 init_channel_config();
183
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184 pc = poptGetContext(NULL, argc, argv, long_options, 0);
185 poptReadDefaultConfig(pc, 0);
186
187 while ((opt = poptGetNextOpt(pc)) != -1) {
188 switch (opt) {
189 case OPT_HELP:
190 usage(stderr);
191 ret = CMD_SUCCESS;
192 goto end;
193 case OPT_USERSPACE:
194 opt_userspace = 1;
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195 opt_cmd_name = poptGetOptArg(pc);
196 break;
197 case OPT_DISCARD:
198 chan.attr.overwrite = 0;
199 DBG("Channel set to discard");
200 break;
201 case OPT_OVERWRITE:
202 chan.attr.overwrite = 1;
203 DBG("Channel set to overwrite");
204 break;
205 case OPT_SUBBUF_SIZE:
206 chan.attr.subbuf_size = atol(poptGetOptArg(pc));
5a0de755 207 DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
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208 break;
209 case OPT_NUM_SUBBUF:
210 chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
5a0de755 211 DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
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212 break;
213 case OPT_SWITCH_TIMER:
214 chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
215 DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
216 break;
217 case OPT_READ_TIMER:
218 chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
219 DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
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220 break;
221 default:
222 usage(stderr);
223 ret = CMD_UNDEFINED;
224 goto end;
225 }
226 }
227
228 opt_channels = (char*) poptGetArg(pc);
229 if (opt_channels == NULL) {
7d29a247 230 ERR("Missing channel name.\n");
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231 usage(stderr);
232 ret = CMD_SUCCESS;
233 goto end;
234 }
235
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236 if (!opt_session_name) {
237 session_name = get_session_name();
238 if (session_name == NULL) {
239 ret = -1;
240 goto end;
241 }
242 } else {
243 session_name = opt_session_name;
244 }
245
246 ret = enable_channel(session_name);
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247
248end:
249 return ret;
250}
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