Add enable kernel channel support
[lttng-tools.git] / lttng / commands / enable_channels.c
CommitLineData
d36b8583
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 "conf.h"
30#include "utils.h"
31
32static char *opt_channels;
33static char *opt_kernel;
34static int opt_pid_all;
35static int opt_userspace;
36static pid_t opt_pid;
37
38enum {
39 OPT_HELP = 1,
40 OPT_USERSPACE,
41};
42
43static struct poptOption long_options[] = {
44 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
45 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
46 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
47 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
48 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
49 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
50 {0, 0, 0, 0, 0, 0, 0}
51};
52
53/*
54 * usage
55 */
56static void usage(FILE *ofp)
57{
58 fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options]\n");
59 fprintf(ofp, "\n");
60 fprintf(ofp, " -h, --help Show this help\n");
61 fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
62 fprintf(ofp, " -u, --userspace Apply for the user-space tracer\n");
63 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
64 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
65 fprintf(ofp, "\n");
66}
67
68/*
69 * enable_channels
70 *
71 * Enabling channel using the lttng API.
72 */
73static int enable_channels(void)
74{
75 int ret = CMD_SUCCESS;
76 char *channel_name;
77
78 if (set_session_name() < 0) {
79 ret = CMD_ERROR;
80 goto error;
81 }
82
83 /* Strip event list */
84 channel_name = strtok(opt_channels, ",");
85 while (channel_name != NULL) {
86 /* Kernel tracer action */
87 if (opt_kernel) {
88 DBG("Enabling kernel channel %s", channel_name);
89 ret = lttng_kernel_enable_channel(channel_name);
90 if (ret < 0) {
91 goto error;
92 } else {
93 MSG("Kernel channel enabled %s", channel_name);
94 }
95 } else if (opt_userspace) { /* User-space tracer action */
96 /*
97 * TODO: Waiting on lttng UST 2.0
98 */
99 if (opt_pid_all) {
100 } else if (opt_pid != 0) {
101 }
102 ret = CMD_NOT_IMPLEMENTED;
103 goto error;
104 } else {
105 ERR("Please specify a tracer (kernel or user-space)");
106 goto error;
107 }
108
109 /* Next event */
110 channel_name = strtok(NULL, ",");
111 }
112
113error:
114 return ret;
115}
116
117/*
118 * cmd_enable_channels
119 *
120 * Enable channel to trace session
121 */
122int cmd_enable_channels(int argc, const char **argv)
123{
124 int opt, ret;
125 static poptContext pc;
126
127 pc = poptGetContext(NULL, argc, argv, long_options, 0);
128 poptReadDefaultConfig(pc, 0);
129
130 while ((opt = poptGetNextOpt(pc)) != -1) {
131 switch (opt) {
132 case OPT_HELP:
133 usage(stderr);
134 ret = CMD_SUCCESS;
135 goto end;
136 case OPT_USERSPACE:
137 opt_userspace = 1;
138 break;
139 default:
140 usage(stderr);
141 ret = CMD_UNDEFINED;
142 goto end;
143 }
144 }
145
146 opt_channels = (char*) poptGetArg(pc);
147 if (opt_channels == NULL) {
148 ERR("Missing channel name(s).\n");
149 usage(stderr);
150 ret = CMD_SUCCESS;
151 goto end;
152 }
153
154 ret = enable_channels();
155
156end:
157 return ret;
158}
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