Commit | Line | Data |
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f3ed775e DG |
1 | /* |
2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
f3ed775e DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
4c462e79 | 18 | #define _GNU_SOURCE |
b9dfb167 | 19 | #include <assert.h> |
f3ed775e | 20 | #include <stdlib.h> |
679b4943 | 21 | #include <ctype.h> |
3badf2bf | 22 | #include <limits.h> |
8960e9cd DG |
23 | #include <sys/types.h> |
24 | #include <sys/socket.h> | |
25 | #include <signal.h> | |
26 | #include <netinet/in.h> | |
27 | #include <arpa/inet.h> | |
f3ed775e | 28 | |
db758600 | 29 | #include <common/error.h> |
feb0f3e5 | 30 | #include <common/utils.h> |
f3ed775e | 31 | |
beb8c75a | 32 | #include "conf.h" |
679b4943 | 33 | #include "utils.h" |
3c9bd23c | 34 | #include "command.h" |
f3ed775e | 35 | |
b9dfb167 DG |
36 | static const char *str_kernel = "Kernel"; |
37 | static const char *str_ust = "UST"; | |
38 | static const char *str_jul = "JUL"; | |
39 | ||
bdae7d71 PPM |
40 | static |
41 | char *_get_session_name(int quiet) | |
f3ed775e DG |
42 | { |
43 | char *path, *session_name = NULL; | |
44 | ||
45 | /* Get path to config file */ | |
feb0f3e5 | 46 | path = utils_get_home_dir(); |
f3ed775e DG |
47 | if (path == NULL) { |
48 | goto error; | |
49 | } | |
50 | ||
51 | /* Get session name from config */ | |
bdae7d71 PPM |
52 | session_name = quiet ? config_read_session_name_quiet(path) : |
53 | config_read_session_name(path); | |
f3ed775e | 54 | if (session_name == NULL) { |
58a97671 | 55 | goto error; |
f3ed775e DG |
56 | } |
57 | ||
3183dbb0 | 58 | DBG2("Config file path found: %s", path); |
cd80958d | 59 | DBG("Session name found: %s", session_name); |
f3ed775e | 60 | return session_name; |
3183dbb0 DG |
61 | |
62 | error: | |
63 | return NULL; | |
f3ed775e | 64 | } |
679b4943 | 65 | |
bdae7d71 PPM |
66 | /* |
67 | * get_session_name | |
68 | * | |
69 | * Return allocated string with the session name found in the config | |
70 | * directory. | |
71 | */ | |
72 | char *get_session_name(void) | |
73 | { | |
74 | return _get_session_name(0); | |
75 | } | |
76 | ||
77 | /* | |
78 | * get_session_name_quiet (no warnings/errors emitted) | |
79 | * | |
80 | * Return allocated string with the session name found in the config | |
81 | * directory. | |
82 | */ | |
83 | char *get_session_name_quiet(void) | |
84 | { | |
85 | return _get_session_name(1); | |
86 | } | |
87 | ||
3c9bd23c SM |
88 | /* |
89 | * list_commands | |
90 | * | |
91 | * List commands line by line. This is mostly for bash auto completion and to | |
92 | * avoid difficult parsing. | |
93 | */ | |
94 | void list_commands(struct cmd_struct *commands, FILE *ofp) | |
95 | { | |
96 | int i = 0; | |
97 | struct cmd_struct *cmd = NULL; | |
98 | ||
99 | cmd = &commands[i]; | |
100 | while (cmd->name != NULL) { | |
101 | fprintf(ofp, "%s\n", cmd->name); | |
102 | i++; | |
103 | cmd = &commands[i]; | |
104 | } | |
105 | } | |
679b4943 SM |
106 | |
107 | /* | |
108 | * list_cmd_options | |
109 | * | |
110 | * Prints a simple list of the options available to a command. This is intended | |
111 | * to be easily parsed for bash completion. | |
112 | */ | |
113 | void list_cmd_options(FILE *ofp, struct poptOption *options) | |
114 | { | |
115 | int i; | |
116 | struct poptOption *option = NULL; | |
117 | ||
118 | for (i = 0; options[i].longName != NULL; i++) { | |
119 | option = &options[i]; | |
120 | ||
121 | fprintf(ofp, "--%s\n", option->longName); | |
122 | ||
123 | if (isprint(option->shortName)) { | |
124 | fprintf(ofp, "-%c\n", option->shortName); | |
125 | } | |
126 | } | |
127 | } | |
8ce58bad MD |
128 | |
129 | /* | |
130 | * fls: returns the position of the most significant bit. | |
131 | * Returns 0 if no bit is set, else returns the position of the most | |
132 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
133 | */ | |
134 | #if defined(__i386) || defined(__x86_64) | |
135 | static inline | |
136 | unsigned int fls_u32(uint32_t x) | |
137 | { | |
138 | int r; | |
139 | ||
140 | asm("bsrl %1,%0\n\t" | |
141 | "jnz 1f\n\t" | |
142 | "movl $-1,%0\n\t" | |
143 | "1:\n\t" | |
144 | : "=r" (r) : "rm" (x)); | |
145 | return r + 1; | |
146 | } | |
147 | #define HAS_FLS_U32 | |
148 | #endif | |
149 | ||
150 | #if defined(__x86_64) | |
151 | static inline | |
152 | unsigned int fls_u64(uint64_t x) | |
153 | { | |
154 | long r; | |
155 | ||
156 | asm("bsrq %1,%0\n\t" | |
157 | "jnz 1f\n\t" | |
158 | "movq $-1,%0\n\t" | |
159 | "1:\n\t" | |
160 | : "=r" (r) : "rm" (x)); | |
161 | return r + 1; | |
162 | } | |
163 | #define HAS_FLS_U64 | |
164 | #endif | |
165 | ||
166 | #ifndef HAS_FLS_U64 | |
167 | static __attribute__((unused)) | |
168 | unsigned int fls_u64(uint64_t x) | |
169 | { | |
170 | unsigned int r = 64; | |
171 | ||
172 | if (!x) | |
173 | return 0; | |
174 | ||
175 | if (!(x & 0xFFFFFFFF00000000ULL)) { | |
176 | x <<= 32; | |
177 | r -= 32; | |
178 | } | |
179 | if (!(x & 0xFFFF000000000000ULL)) { | |
180 | x <<= 16; | |
181 | r -= 16; | |
182 | } | |
183 | if (!(x & 0xFF00000000000000ULL)) { | |
184 | x <<= 8; | |
185 | r -= 8; | |
186 | } | |
187 | if (!(x & 0xF000000000000000ULL)) { | |
188 | x <<= 4; | |
189 | r -= 4; | |
190 | } | |
191 | if (!(x & 0xC000000000000000ULL)) { | |
192 | x <<= 2; | |
193 | r -= 2; | |
194 | } | |
195 | if (!(x & 0x8000000000000000ULL)) { | |
196 | x <<= 1; | |
197 | r -= 1; | |
198 | } | |
199 | return r; | |
200 | } | |
201 | #endif | |
202 | ||
203 | #ifndef HAS_FLS_U32 | |
204 | static __attribute__((unused)) | |
205 | unsigned int fls_u32(uint32_t x) | |
206 | { | |
207 | unsigned int r = 32; | |
208 | ||
209 | if (!x) | |
210 | return 0; | |
211 | if (!(x & 0xFFFF0000U)) { | |
212 | x <<= 16; | |
213 | r -= 16; | |
214 | } | |
215 | if (!(x & 0xFF000000U)) { | |
216 | x <<= 8; | |
217 | r -= 8; | |
218 | } | |
219 | if (!(x & 0xF0000000U)) { | |
220 | x <<= 4; | |
221 | r -= 4; | |
222 | } | |
223 | if (!(x & 0xC0000000U)) { | |
224 | x <<= 2; | |
225 | r -= 2; | |
226 | } | |
227 | if (!(x & 0x80000000U)) { | |
228 | x <<= 1; | |
229 | r -= 1; | |
230 | } | |
231 | return r; | |
232 | } | |
233 | #endif | |
234 | ||
235 | static | |
236 | unsigned int fls_ulong(unsigned long x) | |
237 | { | |
238 | #if (CAA_BITS_PER_LONG == 32) | |
239 | return fls_u32(x); | |
240 | #else | |
241 | return fls_u64(x); | |
242 | #endif | |
243 | } | |
244 | ||
245 | /* | |
246 | * Return the minimum order for which x <= (1UL << order). | |
247 | * Return -1 if x is 0. | |
248 | */ | |
249 | int get_count_order_u32(uint32_t x) | |
250 | { | |
251 | if (!x) | |
252 | return -1; | |
253 | ||
254 | return fls_u32(x - 1); | |
255 | } | |
256 | ||
257 | /* | |
258 | * Return the minimum order for which x <= (1UL << order). | |
259 | * Return -1 if x is 0. | |
260 | */ | |
261 | int get_count_order_u64(uint64_t x) | |
262 | { | |
263 | if (!x) | |
264 | return -1; | |
265 | ||
266 | return fls_u64(x - 1); | |
267 | } | |
268 | ||
269 | /* | |
270 | * Return the minimum order for which x <= (1UL << order). | |
271 | * Return -1 if x is 0. | |
272 | */ | |
273 | int get_count_order_ulong(unsigned long x) | |
274 | { | |
275 | if (!x) | |
276 | return -1; | |
277 | ||
278 | return fls_ulong(x - 1); | |
279 | } | |
b9dfb167 DG |
280 | |
281 | const char *get_domain_str(enum lttng_domain_type domain) | |
282 | { | |
283 | const char *str_dom; | |
284 | ||
285 | switch (domain) { | |
286 | case LTTNG_DOMAIN_KERNEL: | |
287 | str_dom = str_kernel; | |
288 | break; | |
289 | case LTTNG_DOMAIN_UST: | |
290 | str_dom = str_ust; | |
291 | break; | |
292 | case LTTNG_DOMAIN_JUL: | |
293 | str_dom = str_jul; | |
294 | break; | |
295 | default: | |
296 | /* Should not have an unknown domain or else define it. */ | |
297 | assert(0); | |
298 | } | |
299 | ||
300 | return str_dom; | |
301 | } | |
8960e9cd DG |
302 | |
303 | /* | |
304 | * Spawn a lttng relayd daemon by forking and execv. | |
305 | */ | |
306 | int spawn_relayd(const char *pathname, int port) | |
307 | { | |
308 | int ret = 0; | |
309 | pid_t pid; | |
310 | char url[255]; | |
311 | ||
312 | if (!port) { | |
313 | port = DEFAULT_NETWORK_VIEWER_PORT; | |
314 | } | |
315 | ||
316 | ret = snprintf(url, sizeof(url), "tcp://localhost:%d", port); | |
317 | if (ret < 0) { | |
318 | goto end; | |
319 | } | |
320 | ||
321 | MSG("Spawning a relayd daemon"); | |
322 | pid = fork(); | |
323 | if (pid == 0) { | |
324 | /* | |
325 | * Spawn session daemon and tell | |
326 | * it to signal us when ready. | |
327 | */ | |
328 | execlp(pathname, "lttng-relayd", "-L", url, NULL); | |
329 | /* execlp only returns if error happened */ | |
330 | if (errno == ENOENT) { | |
331 | ERR("No relayd found. Use --relayd-path."); | |
332 | } else { | |
333 | perror("execlp"); | |
334 | } | |
335 | kill(getppid(), SIGTERM); /* wake parent */ | |
336 | exit(EXIT_FAILURE); | |
337 | } else if (pid > 0) { | |
338 | goto end; | |
339 | } else { | |
340 | perror("fork"); | |
341 | ret = -1; | |
342 | goto end; | |
343 | } | |
344 | ||
345 | end: | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Check if relayd is alive. | |
351 | * | |
352 | * Return 1 if found else 0 if NOT found. Negative value on error. | |
353 | */ | |
354 | int check_relayd(void) | |
355 | { | |
356 | int ret, fd; | |
357 | struct sockaddr_in sin; | |
358 | ||
359 | fd = socket(AF_INET, SOCK_STREAM, 0); | |
360 | if (fd < 0) { | |
361 | perror("socket check relayd"); | |
dd02a4c1 DG |
362 | ret = -1; |
363 | goto error_socket; | |
8960e9cd DG |
364 | } |
365 | ||
366 | sin.sin_family = AF_INET; | |
367 | sin.sin_port = htons(DEFAULT_NETWORK_VIEWER_PORT); | |
368 | ret = inet_pton(sin.sin_family, "127.0.0.1", &sin.sin_addr); | |
369 | if (ret < 1) { | |
370 | perror("inet_pton check relayd"); | |
dd02a4c1 | 371 | ret = -1; |
8960e9cd DG |
372 | goto error; |
373 | } | |
374 | ||
375 | /* | |
376 | * A successful connect means the relayd exists thus returning 0 else a | |
377 | * negative value means it does NOT exists. | |
378 | */ | |
379 | ret = connect(fd, &sin, sizeof(sin)); | |
380 | if (ret < 0) { | |
381 | /* Not found. */ | |
382 | ret = 0; | |
383 | } else { | |
384 | /* Already spawned. */ | |
385 | ret = 1; | |
386 | } | |
387 | ||
8960e9cd | 388 | error: |
dd02a4c1 DG |
389 | if (close(fd) < 0) { |
390 | perror("close relayd fd"); | |
391 | } | |
392 | error_socket: | |
393 | return ret; | |
8960e9cd | 394 | } |