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f3ed775e 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" | |
beb8c75a | 29 | #include "conf.h" |
f3ed775e DG |
30 | #include "utils.h" |
31 | ||
32 | static char *opt_event_list; | |
33 | static int opt_event_type; | |
34 | static char *opt_kernel; | |
35 | static char *opt_cmd_name; | |
36 | static int opt_pid_all; | |
37 | static int opt_userspace; | |
38 | static int opt_enable_all; | |
39 | static pid_t opt_pid; | |
40 | static char *opt_kprobe_addr; | |
41 | static char *opt_function_symbol; | |
42 | static char *opt_channel_name; | |
43 | ||
44 | enum { | |
45 | OPT_HELP = 1, | |
46 | OPT_USERSPACE, | |
47 | OPT_TRACEPOINT, | |
48 | OPT_MARKER, | |
49 | OPT_KPROBE, | |
50 | OPT_FUNCTION, | |
51 | }; | |
52 | ||
53 | static struct poptOption long_options[] = { | |
54 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
55 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
56 | {"all-events", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0}, | |
57 | {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0}, | |
58 | {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0}, | |
59 | {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0}, | |
60 | {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0}, | |
61 | {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0}, | |
62 | {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0}, | |
63 | {"marker", 0, POPT_ARG_NONE, 0, OPT_MARKER, 0, 0}, | |
64 | {"kprobe", 0, POPT_ARG_STRING, 0, OPT_KPROBE, 0, 0}, | |
65 | {"function", 0, POPT_ARG_STRING, 0, OPT_FUNCTION, 0, 0}, | |
66 | {0, 0, 0, 0, 0, 0, 0} | |
67 | }; | |
68 | ||
69 | /* | |
70 | * usage | |
71 | */ | |
72 | static void usage(FILE *ofp) | |
73 | { | |
74 | fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n"); | |
75 | fprintf(ofp, "\n"); | |
76 | fprintf(ofp, " -h, --help Show this help\n"); | |
77 | fprintf(ofp, " -c, --channel Apply on this channel\n"); | |
78 | fprintf(ofp, " -a, --all-events Enable all tracepoints\n"); | |
79 | fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n"); | |
80 | fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n"); | |
81 | fprintf(ofp, " --all If -u, apply on all traceable apps\n"); | |
82 | fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n"); | |
83 | fprintf(ofp, "\n"); | |
84 | fprintf(ofp, "Event options:\n"); | |
85 | fprintf(ofp, " --tracepoint Tracepoint event (default)\n"); | |
86 | fprintf(ofp, " --kprobe ADDR Kernel Kprobe\n"); | |
87 | fprintf(ofp, " --function SYMBOL Function tracer event\n"); | |
88 | fprintf(ofp, " --marker User-space marker (deprecated)\n"); | |
89 | fprintf(ofp, "\n"); | |
90 | } | |
91 | ||
92 | /* | |
93 | * enable_events | |
94 | * | |
95 | * Enabling event using the lttng API. | |
96 | */ | |
97 | static int enable_events(void) | |
98 | { | |
99 | int err, ret = CMD_SUCCESS; | |
100 | char *event_name, *channel_name; | |
101 | struct lttng_event ev; | |
102 | ||
103 | if (set_session_name() < 0) { | |
104 | ret = CMD_ERROR; | |
105 | goto error; | |
106 | } | |
107 | ||
108 | if (opt_channel_name == NULL) { | |
109 | err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME); | |
110 | if (err < 0) { | |
111 | ret = CMD_FATAL; | |
112 | goto error; | |
113 | } | |
114 | } else { | |
115 | channel_name = opt_channel_name; | |
116 | } | |
117 | ||
118 | if (opt_enable_all) { | |
119 | if (opt_kernel) { | |
120 | ret = lttng_kernel_enable_event(NULL, channel_name); | |
121 | goto error; | |
122 | } | |
123 | ||
124 | /* TODO: User-space tracer */ | |
125 | } | |
126 | ||
127 | /* Strip event list */ | |
128 | event_name = strtok(opt_event_list, ","); | |
129 | while (event_name != NULL) { | |
130 | /* Kernel tracer action */ | |
131 | if (opt_kernel) { | |
132 | DBG("Enabling kernel event %s for channel %s", | |
133 | event_name, channel_name); | |
134 | /* Copy name and type of the event */ | |
135 | strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN); | |
136 | ev.type = opt_event_type; | |
137 | ||
138 | switch (opt_event_type) { | |
139 | case LTTNG_EVENT_TRACEPOINTS: | |
140 | ret = lttng_kernel_enable_event(&ev, channel_name); | |
141 | break; | |
142 | case LTTNG_EVENT_KPROBES: | |
143 | /* FIXME: check addr format */ | |
144 | ev.attr.kprobe.addr = atoll(opt_kprobe_addr); | |
145 | ret = lttng_kernel_enable_event(&ev, channel_name); | |
146 | break; | |
147 | case LTTNG_EVENT_FUNCTION: | |
148 | strncpy(ev.attr.ftrace.symbol_name, opt_function_symbol, LTTNG_SYMBOL_NAME_LEN); | |
149 | ret = lttng_kernel_enable_event(&ev, channel_name); | |
150 | break; | |
151 | default: | |
152 | ret = CMD_NOT_IMPLEMENTED; | |
153 | goto error; | |
154 | } | |
155 | ||
156 | if (ret > 0) { | |
157 | MSG("Kernel event %s created in channel %s", event_name, channel_name); | |
158 | } | |
159 | } else if (opt_userspace) { /* User-space tracer action */ | |
160 | /* | |
161 | * TODO: Waiting on lttng UST 2.0 | |
162 | */ | |
163 | if (opt_pid_all) { | |
164 | } else if (opt_pid != 0) { | |
165 | } | |
166 | ret = CMD_NOT_IMPLEMENTED; | |
167 | goto error; | |
168 | } else { | |
169 | ERR("Please specify a tracer (kernel or user-space)"); | |
170 | goto error; | |
171 | } | |
172 | ||
173 | /* Next event */ | |
174 | event_name = strtok(NULL, ","); | |
175 | } | |
176 | ||
177 | error: | |
178 | return ret; | |
179 | } | |
180 | ||
181 | /* | |
182 | * cmd_enable_events | |
183 | * | |
184 | * Add event to trace session | |
185 | */ | |
186 | int cmd_enable_events(int argc, const char **argv) | |
187 | { | |
188 | int opt, ret; | |
189 | static poptContext pc; | |
190 | ||
191 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
192 | poptReadDefaultConfig(pc, 0); | |
193 | ||
194 | /* Default event type */ | |
195 | opt_event_type = LTTNG_KERNEL_TRACEPOINTS; | |
196 | ||
197 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
198 | switch (opt) { | |
199 | case OPT_HELP: | |
200 | usage(stderr); | |
201 | ret = CMD_SUCCESS; | |
202 | goto end; | |
203 | case OPT_USERSPACE: | |
204 | opt_userspace = 1; | |
205 | opt_cmd_name = poptGetOptArg(pc); | |
206 | break; | |
207 | case OPT_TRACEPOINT: | |
208 | opt_event_type = LTTNG_EVENT_TRACEPOINTS; | |
209 | break; | |
210 | case OPT_MARKER: | |
211 | ret = CMD_NOT_IMPLEMENTED; | |
212 | goto end; | |
213 | case OPT_KPROBE: | |
214 | opt_event_type = LTTNG_EVENT_KPROBES; | |
215 | opt_kprobe_addr = poptGetOptArg(pc); | |
216 | break; | |
217 | case OPT_FUNCTION: | |
218 | opt_event_type = LTTNG_EVENT_FUNCTION; | |
219 | opt_function_symbol = poptGetOptArg(pc); | |
220 | break; | |
221 | default: | |
222 | usage(stderr); | |
223 | ret = CMD_UNDEFINED; | |
224 | goto end; | |
225 | } | |
226 | } | |
227 | ||
228 | opt_event_list = (char*) poptGetArg(pc); | |
229 | if (opt_event_list == NULL && opt_enable_all == 0) { | |
230 | ERR("Missing event name(s).\n"); | |
231 | usage(stderr); | |
232 | ret = CMD_SUCCESS; | |
233 | goto end; | |
234 | } | |
235 | ||
236 | ret = enable_events(); | |
237 | ||
238 | end: | |
239 | return ret; | |
240 | } |