Commit | Line | Data |
---|---|---|
81b86775 DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
66495845 | 3 | * Copyright (C) 2013 - Raphaël Beamonte <raphael.beamonte@gmail.com> |
8db0dc00 | 4 | * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
81b86775 DG |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License, version 2 only, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
35f90c40 | 21 | #include <assert.h> |
81b86775 DG |
22 | #include <ctype.h> |
23 | #include <fcntl.h> | |
24 | #include <limits.h> | |
25 | #include <stdlib.h> | |
2d851108 | 26 | #include <sys/stat.h> |
0c7bcad5 | 27 | #include <sys/types.h> |
2d851108 | 28 | #include <unistd.h> |
fe4477ee | 29 | #include <inttypes.h> |
6c71277b | 30 | #include <grp.h> |
fb198a11 | 31 | #include <pwd.h> |
c9cb3e7d | 32 | #include <sys/file.h> |
a98e236e | 33 | #include <unistd.h> |
81b86775 DG |
34 | |
35 | #include <common/common.h> | |
09b72f7a | 36 | #include <common/readwrite.h> |
fe4477ee | 37 | #include <common/runas.h> |
e8fa9fb0 | 38 | #include <common/compat/getenv.h> |
f5436bfc | 39 | #include <common/compat/string.h> |
5a2451c9 | 40 | #include <common/compat/dirent.h> |
18710679 | 41 | #include <common/compat/directory-handle.h> |
28ab59d0 | 42 | #include <common/dynamic-buffer.h> |
40804255 | 43 | #include <common/string-utils/format.h> |
d7c23421 | 44 | #include <lttng/constant.h> |
81b86775 DG |
45 | |
46 | #include "utils.h" | |
feb0f3e5 | 47 | #include "defaults.h" |
2daf6502 | 48 | #include "time.h" |
81b86775 | 49 | |
09b72f7a FD |
50 | #define PROC_MEMINFO_PATH "/proc/meminfo" |
51 | #define PROC_MEMINFO_MEMAVAILABLE_LINE "MemAvailable:" | |
52 | #define PROC_MEMINFO_MEMTOTAL_LINE "MemTotal:" | |
53 | ||
54 | /* The length of the longest field of `/proc/meminfo`. */ | |
55 | #define PROC_MEMINFO_FIELD_MAX_NAME_LEN 20 | |
56 | ||
57 | #if (PROC_MEMINFO_FIELD_MAX_NAME_LEN == 20) | |
58 | #define MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "19" | |
59 | #else | |
60 | #error MAX_NAME_LEN_SCANF_IS_A_BROKEN_API must be updated to match (PROC_MEMINFO_FIELD_MAX_NAME_LEN - 1) | |
61 | #endif | |
62 | ||
5154230f RB |
63 | /* |
64 | * Return a partial realpath(3) of the path even if the full path does not | |
65 | * exist. For instance, with /tmp/test1/test2/test3, if test2/ does not exist | |
66 | * but the /tmp/test1 does, the real path for /tmp/test1 is concatened with | |
67 | * /test2/test3 then returned. In normal time, realpath(3) fails if the end | |
68 | * point directory does not exist. | |
69 | * In case resolved_path is NULL, the string returned was allocated in the | |
70 | * function and thus need to be freed by the caller. The size argument allows | |
71 | * to specify the size of the resolved_path argument if given, or the size to | |
72 | * allocate. | |
73 | */ | |
74 | LTTNG_HIDDEN | |
75 | char *utils_partial_realpath(const char *path, char *resolved_path, size_t size) | |
76 | { | |
9482daac | 77 | char *cut_path = NULL, *try_path = NULL, *try_path_prev = NULL; |
5154230f RB |
78 | const char *next, *prev, *end; |
79 | ||
80 | /* Safety net */ | |
81 | if (path == NULL) { | |
82 | goto error; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Identify the end of the path, we don't want to treat the | |
87 | * last char if it is a '/', we will just keep it on the side | |
88 | * to be added at the end, and return a value coherent with | |
89 | * the path given as argument | |
90 | */ | |
91 | end = path + strlen(path); | |
92 | if (*(end-1) == '/') { | |
93 | end--; | |
94 | } | |
95 | ||
96 | /* Initiate the values of the pointers before looping */ | |
97 | next = path; | |
98 | prev = next; | |
99 | /* Only to ensure try_path is not NULL to enter the while */ | |
100 | try_path = (char *)next; | |
101 | ||
102 | /* Resolve the canonical path of the first part of the path */ | |
103 | while (try_path != NULL && next != end) { | |
d7c23421 JG |
104 | char *try_path_buf = NULL; |
105 | ||
5154230f RB |
106 | /* |
107 | * If there is not any '/' left, we want to try with | |
108 | * the full path | |
109 | */ | |
110 | next = strpbrk(next + 1, "/"); | |
111 | if (next == NULL) { | |
112 | next = end; | |
113 | } | |
114 | ||
115 | /* Cut the part we will be trying to resolve */ | |
f5436bfc | 116 | cut_path = lttng_strndup(path, next - path); |
d9dbcf5e | 117 | if (cut_path == NULL) { |
f5436bfc | 118 | PERROR("lttng_strndup"); |
d9dbcf5e MD |
119 | goto error; |
120 | } | |
5154230f | 121 | |
d7c23421 JG |
122 | try_path_buf = zmalloc(LTTNG_PATH_MAX); |
123 | if (!try_path_buf) { | |
124 | PERROR("zmalloc"); | |
125 | goto error; | |
126 | } | |
127 | ||
5154230f | 128 | /* Try to resolve this part */ |
f3472d9a | 129 | try_path = realpath((char *) cut_path, try_path_buf); |
5154230f | 130 | if (try_path == NULL) { |
d7c23421 | 131 | free(try_path_buf); |
5154230f RB |
132 | /* |
133 | * There was an error, we just want to be assured it | |
134 | * is linked to an unexistent directory, if it's another | |
135 | * reason, we spawn an error | |
136 | */ | |
137 | switch (errno) { | |
138 | case ENOENT: | |
139 | /* Ignore the error */ | |
140 | break; | |
141 | default: | |
142 | PERROR("realpath (partial_realpath)"); | |
143 | goto error; | |
144 | break; | |
145 | } | |
146 | } else { | |
147 | /* Save the place we are before trying the next step */ | |
d7c23421 | 148 | try_path_buf = NULL; |
5154230f RB |
149 | free(try_path_prev); |
150 | try_path_prev = try_path; | |
151 | prev = next; | |
152 | } | |
153 | ||
154 | /* Free the allocated memory */ | |
155 | free(cut_path); | |
c14cc491 | 156 | cut_path = NULL; |
494a8e99 | 157 | } |
5154230f RB |
158 | |
159 | /* Allocate memory for the resolved path if necessary */ | |
160 | if (resolved_path == NULL) { | |
161 | resolved_path = zmalloc(size); | |
162 | if (resolved_path == NULL) { | |
163 | PERROR("zmalloc resolved path"); | |
164 | goto error; | |
165 | } | |
166 | } | |
167 | ||
168 | /* | |
169 | * If we were able to solve at least partially the path, we can concatenate | |
170 | * what worked and what didn't work | |
171 | */ | |
172 | if (try_path_prev != NULL) { | |
173 | /* If we risk to concatenate two '/', we remove one of them */ | |
174 | if (try_path_prev[strlen(try_path_prev) - 1] == '/' && prev[0] == '/') { | |
175 | try_path_prev[strlen(try_path_prev) - 1] = '\0'; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Duplicate the memory used by prev in case resolved_path and | |
180 | * path are pointers for the same memory space | |
181 | */ | |
182 | cut_path = strdup(prev); | |
d9dbcf5e MD |
183 | if (cut_path == NULL) { |
184 | PERROR("strdup"); | |
185 | goto error; | |
186 | } | |
5154230f RB |
187 | |
188 | /* Concatenate the strings */ | |
189 | snprintf(resolved_path, size, "%s%s", try_path_prev, cut_path); | |
190 | ||
191 | /* Free the allocated memory */ | |
192 | free(cut_path); | |
193 | free(try_path_prev); | |
494a8e99 JG |
194 | cut_path = NULL; |
195 | try_path_prev = NULL; | |
5154230f RB |
196 | /* |
197 | * Else, we just copy the path in our resolved_path to | |
198 | * return it as is | |
199 | */ | |
200 | } else { | |
201 | strncpy(resolved_path, path, size); | |
202 | } | |
203 | ||
204 | /* Then we return the 'partially' resolved path */ | |
205 | return resolved_path; | |
206 | ||
207 | error: | |
208 | free(resolved_path); | |
9482daac | 209 | free(cut_path); |
b86d5f3f | 210 | free(try_path); |
32bd4678 MJ |
211 | if (try_path_prev != try_path) { |
212 | free(try_path_prev); | |
213 | } | |
5154230f RB |
214 | return NULL; |
215 | } | |
216 | ||
4b223a67 | 217 | static |
6740483e | 218 | int expand_double_slashes_dot_and_dotdot(char *path) |
4b223a67 FD |
219 | { |
220 | size_t expanded_path_len, path_len; | |
221 | const char *curr_char, *path_last_char, *next_slash, *prev_slash; | |
222 | ||
223 | path_len = strlen(path); | |
224 | path_last_char = &path[path_len]; | |
225 | ||
226 | if (path_len == 0) { | |
4b223a67 FD |
227 | goto error; |
228 | } | |
229 | ||
230 | expanded_path_len = 0; | |
231 | ||
232 | /* We iterate over the provided path to expand the "//", "../" and "./" */ | |
233 | for (curr_char = path; curr_char <= path_last_char; curr_char = next_slash + 1) { | |
234 | /* Find the next forward slash. */ | |
235 | size_t curr_token_len; | |
236 | ||
237 | if (curr_char == path_last_char) { | |
238 | expanded_path_len++; | |
239 | break; | |
240 | } | |
241 | ||
242 | next_slash = memchr(curr_char, '/', path_last_char - curr_char); | |
243 | if (next_slash == NULL) { | |
244 | /* Reached the end of the provided path. */ | |
245 | next_slash = path_last_char; | |
246 | } | |
247 | ||
248 | /* Compute how long is the previous token. */ | |
249 | curr_token_len = next_slash - curr_char; | |
250 | switch(curr_token_len) { | |
251 | case 0: | |
252 | /* | |
253 | * The pointer has not move meaning that curr_char is | |
254 | * pointing to a slash. It that case there is no token | |
255 | * to copy, so continue the iteration to find the next | |
256 | * token | |
257 | */ | |
258 | continue; | |
259 | case 1: | |
260 | /* | |
261 | * The pointer moved 1 character. Check if that | |
262 | * character is a dot ('.'), if it is: omit it, else | |
263 | * copy the token to the normalized path. | |
264 | */ | |
265 | if (curr_char[0] == '.') { | |
266 | continue; | |
267 | } | |
268 | break; | |
269 | case 2: | |
270 | /* | |
271 | * The pointer moved 2 characters. Check if these | |
272 | * characters are double dots ('..'). If that is the | |
273 | * case, we need to remove the last token of the | |
274 | * normalized path. | |
275 | */ | |
276 | if (curr_char[0] == '.' && curr_char[1] == '.') { | |
277 | /* | |
278 | * Find the previous path component by | |
279 | * using the memrchr function to find the | |
280 | * previous forward slash and substract that | |
281 | * len to the resulting path. | |
282 | */ | |
283 | prev_slash = lttng_memrchr(path, '/', expanded_path_len); | |
284 | /* | |
285 | * If prev_slash is NULL, we reached the | |
286 | * beginning of the path. We can't go back any | |
287 | * further. | |
288 | */ | |
289 | if (prev_slash != NULL) { | |
290 | expanded_path_len = prev_slash - path; | |
291 | } | |
292 | continue; | |
293 | } | |
294 | break; | |
295 | default: | |
296 | break; | |
297 | } | |
298 | ||
299 | /* | |
300 | * Copy the current token which is neither a '.' nor a '..'. | |
301 | */ | |
302 | path[expanded_path_len++] = '/'; | |
303 | memcpy(&path[expanded_path_len], curr_char, curr_token_len); | |
304 | expanded_path_len += curr_token_len; | |
305 | } | |
306 | ||
307 | if (expanded_path_len == 0) { | |
308 | path[expanded_path_len++] = '/'; | |
309 | } | |
310 | ||
311 | path[expanded_path_len] = '\0'; | |
6740483e | 312 | return 0; |
4b223a67 | 313 | error: |
6740483e | 314 | return -1; |
4b223a67 FD |
315 | } |
316 | ||
81b86775 | 317 | /* |
3d229795 RB |
318 | * Make a full resolution of the given path even if it doesn't exist. |
319 | * This function uses the utils_partial_realpath function to resolve | |
320 | * symlinks and relatives paths at the start of the string, and | |
321 | * implements functionnalities to resolve the './' and '../' strings | |
322 | * in the middle of a path. This function is only necessary because | |
323 | * realpath(3) does not accept to resolve unexistent paths. | |
324 | * The returned string was allocated in the function, it is thus of | |
325 | * the responsibility of the caller to free this memory. | |
81b86775 | 326 | */ |
83c50c54 | 327 | static |
4b223a67 | 328 | char *_utils_expand_path(const char *path, bool keep_symlink) |
81b86775 | 329 | { |
857f0d94 | 330 | int ret; |
4b223a67 | 331 | char *absolute_path = NULL; |
5de083f4 | 332 | char *last_token; |
6740483e | 333 | bool is_dot, is_dotdot; |
81b86775 DG |
334 | |
335 | /* Safety net */ | |
336 | if (path == NULL) { | |
337 | goto error; | |
338 | } | |
339 | ||
3d229795 | 340 | /* Allocate memory for the absolute_path */ |
857f0d94 | 341 | absolute_path = zmalloc(LTTNG_PATH_MAX); |
3d229795 | 342 | if (absolute_path == NULL) { |
81b86775 DG |
343 | PERROR("zmalloc expand path"); |
344 | goto error; | |
345 | } | |
346 | ||
4b223a67 | 347 | if (path[0] == '/') { |
857f0d94 JG |
348 | ret = lttng_strncpy(absolute_path, path, LTTNG_PATH_MAX); |
349 | if (ret) { | |
350 | ERR("Path exceeds maximal size of %i bytes", LTTNG_PATH_MAX); | |
351 | goto error; | |
352 | } | |
4b223a67 FD |
353 | } else { |
354 | /* | |
355 | * This is a relative path. We need to get the present working | |
356 | * directory and start the path walk from there. | |
357 | */ | |
857f0d94 | 358 | char current_working_dir[LTTNG_PATH_MAX]; |
4b223a67 | 359 | char *cwd_ret; |
857f0d94 | 360 | |
4b223a67 FD |
361 | cwd_ret = getcwd(current_working_dir, sizeof(current_working_dir)); |
362 | if (!cwd_ret) { | |
d9dbcf5e MD |
363 | goto error; |
364 | } | |
4b223a67 FD |
365 | /* |
366 | * Get the number of character in the CWD and allocate an array | |
367 | * to can hold it and the path provided by the caller. | |
368 | */ | |
857f0d94 JG |
369 | ret = snprintf(absolute_path, LTTNG_PATH_MAX, "%s/%s", |
370 | current_working_dir, path); | |
371 | if (ret >= LTTNG_PATH_MAX) { | |
372 | ERR("Concatenating current working directory %s and path %s exceeds maximal size of %i bytes", | |
373 | current_working_dir, path, LTTNG_PATH_MAX); | |
374 | goto error; | |
375 | } | |
3d229795 | 376 | } |
116f95d9 | 377 | |
4b223a67 FD |
378 | if (keep_symlink) { |
379 | /* Resolve partially our path */ | |
3d229795 | 380 | absolute_path = utils_partial_realpath(absolute_path, |
857f0d94 | 381 | absolute_path, LTTNG_PATH_MAX); |
cec6b2a5 FD |
382 | if (!absolute_path) { |
383 | goto error; | |
384 | } | |
116f95d9 | 385 | } |
81b86775 | 386 | |
6740483e JG |
387 | ret = expand_double_slashes_dot_and_dotdot(absolute_path); |
388 | if (ret) { | |
4b223a67 FD |
389 | goto error; |
390 | } | |
391 | ||
5de083f4 RB |
392 | /* Identify the last token */ |
393 | last_token = strrchr(absolute_path, '/'); | |
394 | ||
395 | /* Verify that this token is not a relative path */ | |
396 | is_dotdot = (strcmp(last_token, "/..") == 0); | |
397 | is_dot = (strcmp(last_token, "/.") == 0); | |
398 | ||
399 | /* If it is, take action */ | |
400 | if (is_dot || is_dotdot) { | |
401 | /* For both, remove this token */ | |
402 | *last_token = '\0'; | |
403 | ||
404 | /* If it was a reference to parent directory, go back one more time */ | |
405 | if (is_dotdot) { | |
406 | last_token = strrchr(absolute_path, '/'); | |
407 | ||
408 | /* If there was only one level left, we keep the first '/' */ | |
409 | if (last_token == absolute_path) { | |
410 | last_token++; | |
411 | } | |
412 | ||
413 | *last_token = '\0'; | |
414 | } | |
415 | } | |
416 | ||
3d229795 | 417 | return absolute_path; |
81b86775 DG |
418 | |
419 | error: | |
3d229795 | 420 | free(absolute_path); |
81b86775 DG |
421 | return NULL; |
422 | } | |
4b223a67 FD |
423 | LTTNG_HIDDEN |
424 | char *utils_expand_path(const char *path) | |
425 | { | |
426 | return _utils_expand_path(path, true); | |
427 | } | |
81b86775 | 428 | |
4b223a67 FD |
429 | LTTNG_HIDDEN |
430 | char *utils_expand_path_keep_symlink(const char *path) | |
431 | { | |
432 | return _utils_expand_path(path, false); | |
433 | } | |
81b86775 DG |
434 | /* |
435 | * Create a pipe in dst. | |
436 | */ | |
90e535ef | 437 | LTTNG_HIDDEN |
81b86775 DG |
438 | int utils_create_pipe(int *dst) |
439 | { | |
440 | int ret; | |
441 | ||
442 | if (dst == NULL) { | |
443 | return -1; | |
444 | } | |
445 | ||
446 | ret = pipe(dst); | |
447 | if (ret < 0) { | |
448 | PERROR("create pipe"); | |
449 | } | |
450 | ||
451 | return ret; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Create pipe and set CLOEXEC flag to both fd. | |
456 | * | |
457 | * Make sure the pipe opened by this function are closed at some point. Use | |
458 | * utils_close_pipe(). | |
459 | */ | |
90e535ef | 460 | LTTNG_HIDDEN |
81b86775 DG |
461 | int utils_create_pipe_cloexec(int *dst) |
462 | { | |
463 | int ret, i; | |
464 | ||
465 | if (dst == NULL) { | |
466 | return -1; | |
467 | } | |
468 | ||
469 | ret = utils_create_pipe(dst); | |
470 | if (ret < 0) { | |
471 | goto error; | |
472 | } | |
473 | ||
474 | for (i = 0; i < 2; i++) { | |
475 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
476 | if (ret < 0) { | |
477 | PERROR("fcntl pipe cloexec"); | |
478 | goto error; | |
479 | } | |
480 | } | |
481 | ||
482 | error: | |
483 | return ret; | |
484 | } | |
485 | ||
094f381c MD |
486 | /* |
487 | * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK. | |
488 | * | |
489 | * Make sure the pipe opened by this function are closed at some point. Use | |
490 | * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to | |
491 | * support OSes other than Linux 2.6.23+. | |
492 | */ | |
493 | LTTNG_HIDDEN | |
494 | int utils_create_pipe_cloexec_nonblock(int *dst) | |
495 | { | |
496 | int ret, i; | |
497 | ||
498 | if (dst == NULL) { | |
499 | return -1; | |
500 | } | |
501 | ||
502 | ret = utils_create_pipe(dst); | |
503 | if (ret < 0) { | |
504 | goto error; | |
505 | } | |
506 | ||
507 | for (i = 0; i < 2; i++) { | |
508 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
509 | if (ret < 0) { | |
510 | PERROR("fcntl pipe cloexec"); | |
511 | goto error; | |
512 | } | |
513 | /* | |
514 | * Note: we override any flag that could have been | |
515 | * previously set on the fd. | |
516 | */ | |
517 | ret = fcntl(dst[i], F_SETFL, O_NONBLOCK); | |
518 | if (ret < 0) { | |
519 | PERROR("fcntl pipe nonblock"); | |
520 | goto error; | |
521 | } | |
522 | } | |
523 | ||
524 | error: | |
525 | return ret; | |
526 | } | |
527 | ||
81b86775 DG |
528 | /* |
529 | * Close both read and write side of the pipe. | |
530 | */ | |
90e535ef | 531 | LTTNG_HIDDEN |
81b86775 DG |
532 | void utils_close_pipe(int *src) |
533 | { | |
534 | int i, ret; | |
535 | ||
536 | if (src == NULL) { | |
537 | return; | |
538 | } | |
539 | ||
540 | for (i = 0; i < 2; i++) { | |
541 | /* Safety check */ | |
542 | if (src[i] < 0) { | |
543 | continue; | |
544 | } | |
545 | ||
546 | ret = close(src[i]); | |
547 | if (ret) { | |
548 | PERROR("close pipe"); | |
549 | } | |
550 | } | |
551 | } | |
a4b92340 DG |
552 | |
553 | /* | |
554 | * Create a new string using two strings range. | |
555 | */ | |
90e535ef | 556 | LTTNG_HIDDEN |
a4b92340 DG |
557 | char *utils_strdupdelim(const char *begin, const char *end) |
558 | { | |
559 | char *str; | |
560 | ||
561 | str = zmalloc(end - begin + 1); | |
562 | if (str == NULL) { | |
563 | PERROR("zmalloc strdupdelim"); | |
564 | goto error; | |
565 | } | |
566 | ||
567 | memcpy(str, begin, end - begin); | |
568 | str[end - begin] = '\0'; | |
569 | ||
570 | error: | |
571 | return str; | |
572 | } | |
b662582b DG |
573 | |
574 | /* | |
575 | * Set CLOEXEC flag to the give file descriptor. | |
576 | */ | |
90e535ef | 577 | LTTNG_HIDDEN |
b662582b DG |
578 | int utils_set_fd_cloexec(int fd) |
579 | { | |
580 | int ret; | |
581 | ||
582 | if (fd < 0) { | |
583 | ret = -EINVAL; | |
584 | goto end; | |
585 | } | |
586 | ||
587 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); | |
588 | if (ret < 0) { | |
589 | PERROR("fcntl cloexec"); | |
590 | ret = -errno; | |
591 | } | |
592 | ||
593 | end: | |
594 | return ret; | |
595 | } | |
35f90c40 DG |
596 | |
597 | /* | |
598 | * Create pid file to the given path and filename. | |
599 | */ | |
90e535ef | 600 | LTTNG_HIDDEN |
35f90c40 DG |
601 | int utils_create_pid_file(pid_t pid, const char *filepath) |
602 | { | |
603 | int ret; | |
604 | FILE *fp; | |
605 | ||
606 | assert(filepath); | |
607 | ||
608 | fp = fopen(filepath, "w"); | |
609 | if (fp == NULL) { | |
610 | PERROR("open pid file %s", filepath); | |
611 | ret = -1; | |
612 | goto error; | |
613 | } | |
614 | ||
d1f721c5 | 615 | ret = fprintf(fp, "%d\n", (int) pid); |
35f90c40 DG |
616 | if (ret < 0) { |
617 | PERROR("fprintf pid file"); | |
e205d79b | 618 | goto error; |
35f90c40 DG |
619 | } |
620 | ||
e205d79b MD |
621 | if (fclose(fp)) { |
622 | PERROR("fclose"); | |
623 | } | |
d1f721c5 | 624 | DBG("Pid %d written in file %s", (int) pid, filepath); |
e205d79b | 625 | ret = 0; |
35f90c40 DG |
626 | error: |
627 | return ret; | |
628 | } | |
2d851108 | 629 | |
c9cb3e7d JG |
630 | /* |
631 | * Create lock file to the given path and filename. | |
632 | * Returns the associated file descriptor, -1 on error. | |
633 | */ | |
634 | LTTNG_HIDDEN | |
635 | int utils_create_lock_file(const char *filepath) | |
636 | { | |
637 | int ret; | |
638 | int fd; | |
77e7fddf | 639 | struct flock lock; |
c9cb3e7d JG |
640 | |
641 | assert(filepath); | |
642 | ||
77e7fddf MJ |
643 | memset(&lock, 0, sizeof(lock)); |
644 | fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | | |
645 | S_IRGRP | S_IWGRP); | |
c9cb3e7d JG |
646 | if (fd < 0) { |
647 | PERROR("open lock file %s", filepath); | |
e6576ba2 | 648 | fd = -1; |
c9cb3e7d JG |
649 | goto error; |
650 | } | |
651 | ||
652 | /* | |
653 | * Attempt to lock the file. If this fails, there is | |
654 | * already a process using the same lock file running | |
655 | * and we should exit. | |
656 | */ | |
77e7fddf MJ |
657 | lock.l_whence = SEEK_SET; |
658 | lock.l_type = F_WRLCK; | |
659 | ||
660 | ret = fcntl(fd, F_SETLK, &lock); | |
661 | if (ret == -1) { | |
662 | PERROR("fcntl lock file"); | |
208ff148 | 663 | ERR("Could not get lock file %s, another instance is running.", |
c9cb3e7d | 664 | filepath); |
ffb0b851 JG |
665 | if (close(fd)) { |
666 | PERROR("close lock file"); | |
667 | } | |
c9cb3e7d JG |
668 | fd = ret; |
669 | goto error; | |
670 | } | |
671 | ||
672 | error: | |
673 | return fd; | |
674 | } | |
675 | ||
2d851108 | 676 | /* |
d77dded2 | 677 | * Create directory using the given path and mode. |
2d851108 DG |
678 | * |
679 | * On success, return 0 else a negative error code. | |
680 | */ | |
90e535ef | 681 | LTTNG_HIDDEN |
d77dded2 JG |
682 | int utils_mkdir(const char *path, mode_t mode, int uid, int gid) |
683 | { | |
684 | int ret; | |
cbf53d23 | 685 | struct lttng_directory_handle *handle; |
69e3a560 | 686 | const struct lttng_credentials creds = { |
18710679 JG |
687 | .uid = (uid_t) uid, |
688 | .gid = (gid_t) gid, | |
689 | }; | |
690 | ||
cbf53d23 JG |
691 | handle = lttng_directory_handle_create(NULL); |
692 | if (!handle) { | |
693 | ret = -1; | |
fd774fc6 JG |
694 | goto end; |
695 | } | |
18710679 | 696 | ret = lttng_directory_handle_create_subdirectory_as_user( |
cbf53d23 | 697 | handle, path, mode, |
18710679 | 698 | (uid >= 0 || gid >= 0) ? &creds : NULL); |
fd774fc6 | 699 | end: |
cbf53d23 | 700 | lttng_directory_handle_put(handle); |
2d851108 DG |
701 | return ret; |
702 | } | |
fe4477ee | 703 | |
d77dded2 JG |
704 | /* |
705 | * Recursively create directory using the given path and mode, under the | |
706 | * provided uid and gid. | |
707 | * | |
708 | * On success, return 0 else a negative error code. | |
709 | */ | |
710 | LTTNG_HIDDEN | |
711 | int utils_mkdir_recursive(const char *path, mode_t mode, int uid, int gid) | |
712 | { | |
713 | int ret; | |
cbf53d23 | 714 | struct lttng_directory_handle *handle; |
69e3a560 | 715 | const struct lttng_credentials creds = { |
18710679 JG |
716 | .uid = (uid_t) uid, |
717 | .gid = (gid_t) gid, | |
718 | }; | |
719 | ||
cbf53d23 JG |
720 | handle = lttng_directory_handle_create(NULL); |
721 | if (!handle) { | |
722 | ret = -1; | |
fd774fc6 JG |
723 | goto end; |
724 | } | |
18710679 | 725 | ret = lttng_directory_handle_create_subdirectory_recursive_as_user( |
cbf53d23 | 726 | handle, path, mode, |
18710679 | 727 | (uid >= 0 || gid >= 0) ? &creds : NULL); |
fd774fc6 | 728 | end: |
cbf53d23 | 729 | lttng_directory_handle_put(handle); |
d77dded2 JG |
730 | return ret; |
731 | } | |
732 | ||
fe4477ee | 733 | /* |
40804255 | 734 | * out_stream_path is the output parameter. |
fe4477ee JD |
735 | * |
736 | * Return 0 on success or else a negative value. | |
737 | */ | |
40804255 JG |
738 | LTTNG_HIDDEN |
739 | int utils_stream_file_path(const char *path_name, const char *file_name, | |
740 | uint64_t size, uint64_t count, const char *suffix, | |
741 | char *out_stream_path, size_t stream_path_len) | |
fe4477ee | 742 | { |
7591bab1 | 743 | int ret; |
40804255 JG |
744 | char count_str[MAX_INT_DEC_LEN(count) + 1] = {}; |
745 | const char *path_separator; | |
fe4477ee | 746 | |
d248f3c2 MD |
747 | if (path_name && (path_name[0] == '\0' || |
748 | path_name[strlen(path_name) - 1] == '/')) { | |
40804255 JG |
749 | path_separator = ""; |
750 | } else { | |
751 | path_separator = "/"; | |
fe4477ee JD |
752 | } |
753 | ||
40804255 JG |
754 | path_name = path_name ? : ""; |
755 | suffix = suffix ? : ""; | |
756 | if (size > 0) { | |
757 | ret = snprintf(count_str, sizeof(count_str), "_%" PRIu64, | |
758 | count); | |
759 | assert(ret > 0 && ret < sizeof(count_str)); | |
309167d2 JD |
760 | } |
761 | ||
40804255 JG |
762 | ret = snprintf(out_stream_path, stream_path_len, "%s%s%s%s%s", |
763 | path_name, path_separator, file_name, count_str, | |
764 | suffix); | |
765 | if (ret < 0 || ret >= stream_path_len) { | |
766 | ERR("Truncation occurred while formatting stream path"); | |
767 | ret = -1; | |
fe4477ee | 768 | } else { |
40804255 | 769 | ret = 0; |
7591bab1 | 770 | } |
7591bab1 MD |
771 | return ret; |
772 | } | |
773 | ||
70d0b120 SM |
774 | /** |
775 | * Parse a string that represents a size in human readable format. It | |
5983a922 | 776 | * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'. |
70d0b120 SM |
777 | * |
778 | * The suffix multiply the integer by: | |
779 | * 'k': 1024 | |
780 | * 'M': 1024^2 | |
781 | * 'G': 1024^3 | |
782 | * | |
783 | * @param str The string to parse. | |
5983a922 | 784 | * @param size Pointer to a uint64_t that will be filled with the |
cfa9a5a2 | 785 | * resulting size. |
70d0b120 SM |
786 | * |
787 | * @return 0 on success, -1 on failure. | |
788 | */ | |
00a52467 | 789 | LTTNG_HIDDEN |
5983a922 | 790 | int utils_parse_size_suffix(const char * const str, uint64_t * const size) |
70d0b120 | 791 | { |
70d0b120 | 792 | int ret; |
5983a922 | 793 | uint64_t base_size; |
70d0b120 | 794 | long shift = 0; |
5983a922 SM |
795 | const char *str_end; |
796 | char *num_end; | |
70d0b120 SM |
797 | |
798 | if (!str) { | |
5983a922 | 799 | DBG("utils_parse_size_suffix: received a NULL string."); |
70d0b120 SM |
800 | ret = -1; |
801 | goto end; | |
802 | } | |
803 | ||
5983a922 SM |
804 | /* strtoull will accept a negative number, but we don't want to. */ |
805 | if (strchr(str, '-') != NULL) { | |
806 | DBG("utils_parse_size_suffix: invalid size string, should not contain '-'."); | |
70d0b120 | 807 | ret = -1; |
5983a922 | 808 | goto end; |
70d0b120 SM |
809 | } |
810 | ||
5983a922 SM |
811 | /* str_end will point to the \0 */ |
812 | str_end = str + strlen(str); | |
70d0b120 | 813 | errno = 0; |
5983a922 | 814 | base_size = strtoull(str, &num_end, 0); |
70d0b120 | 815 | if (errno != 0) { |
5983a922 | 816 | PERROR("utils_parse_size_suffix strtoull"); |
70d0b120 | 817 | ret = -1; |
5983a922 SM |
818 | goto end; |
819 | } | |
820 | ||
821 | if (num_end == str) { | |
822 | /* strtoull parsed nothing, not good. */ | |
823 | DBG("utils_parse_size_suffix: strtoull had nothing good to parse."); | |
824 | ret = -1; | |
825 | goto end; | |
826 | } | |
827 | ||
828 | /* Check if a prefix is present. */ | |
829 | switch (*num_end) { | |
830 | case 'G': | |
831 | shift = GIBI_LOG2; | |
832 | num_end++; | |
833 | break; | |
834 | case 'M': /* */ | |
835 | shift = MEBI_LOG2; | |
836 | num_end++; | |
837 | break; | |
838 | case 'K': | |
839 | case 'k': | |
840 | shift = KIBI_LOG2; | |
841 | num_end++; | |
842 | break; | |
843 | case '\0': | |
844 | break; | |
845 | default: | |
846 | DBG("utils_parse_size_suffix: invalid suffix."); | |
847 | ret = -1; | |
848 | goto end; | |
849 | } | |
850 | ||
851 | /* Check for garbage after the valid input. */ | |
852 | if (num_end != str_end) { | |
853 | DBG("utils_parse_size_suffix: Garbage after size string."); | |
854 | ret = -1; | |
855 | goto end; | |
70d0b120 SM |
856 | } |
857 | ||
858 | *size = base_size << shift; | |
859 | ||
860 | /* Check for overflow */ | |
861 | if ((*size >> shift) != base_size) { | |
5983a922 | 862 | DBG("utils_parse_size_suffix: oops, overflow detected."); |
70d0b120 | 863 | ret = -1; |
5983a922 | 864 | goto end; |
70d0b120 SM |
865 | } |
866 | ||
867 | ret = 0; | |
70d0b120 SM |
868 | end: |
869 | return ret; | |
870 | } | |
cfa9a5a2 | 871 | |
7010c033 SM |
872 | /** |
873 | * Parse a string that represents a time in human readable format. It | |
81684730 JR |
874 | * supports decimal integers suffixed by: |
875 | * "us" for microsecond, | |
876 | * "ms" for millisecond, | |
877 | * "s" for second, | |
878 | * "m" for minute, | |
879 | * "h" for hour | |
7010c033 SM |
880 | * |
881 | * The suffix multiply the integer by: | |
81684730 JR |
882 | * "us" : 1 |
883 | * "ms" : 1000 | |
884 | * "s" : 1000000 | |
885 | * "m" : 60000000 | |
886 | * "h" : 3600000000 | |
7010c033 SM |
887 | * |
888 | * Note that unit-less numbers are assumed to be microseconds. | |
889 | * | |
890 | * @param str The string to parse, assumed to be NULL-terminated. | |
891 | * @param time_us Pointer to a uint64_t that will be filled with the | |
892 | * resulting time in microseconds. | |
893 | * | |
894 | * @return 0 on success, -1 on failure. | |
895 | */ | |
896 | LTTNG_HIDDEN | |
897 | int utils_parse_time_suffix(char const * const str, uint64_t * const time_us) | |
898 | { | |
899 | int ret; | |
900 | uint64_t base_time; | |
81684730 | 901 | uint64_t multiplier = 1; |
7010c033 SM |
902 | const char *str_end; |
903 | char *num_end; | |
904 | ||
905 | if (!str) { | |
906 | DBG("utils_parse_time_suffix: received a NULL string."); | |
907 | ret = -1; | |
908 | goto end; | |
909 | } | |
910 | ||
911 | /* strtoull will accept a negative number, but we don't want to. */ | |
912 | if (strchr(str, '-') != NULL) { | |
913 | DBG("utils_parse_time_suffix: invalid time string, should not contain '-'."); | |
914 | ret = -1; | |
915 | goto end; | |
916 | } | |
917 | ||
918 | /* str_end will point to the \0 */ | |
919 | str_end = str + strlen(str); | |
920 | errno = 0; | |
921 | base_time = strtoull(str, &num_end, 10); | |
922 | if (errno != 0) { | |
923 | PERROR("utils_parse_time_suffix strtoull on string \"%s\"", str); | |
924 | ret = -1; | |
925 | goto end; | |
926 | } | |
927 | ||
928 | if (num_end == str) { | |
929 | /* strtoull parsed nothing, not good. */ | |
930 | DBG("utils_parse_time_suffix: strtoull had nothing good to parse."); | |
931 | ret = -1; | |
932 | goto end; | |
933 | } | |
934 | ||
935 | /* Check if a prefix is present. */ | |
936 | switch (*num_end) { | |
937 | case 'u': | |
81684730 JR |
938 | /* |
939 | * Microsecond (us) | |
940 | * | |
941 | * Skip the "us" if the string matches the "us" suffix, | |
942 | * otherwise let the check for the end of the string handle | |
943 | * the error reporting. | |
944 | */ | |
945 | if (*(num_end + 1) == 's') { | |
946 | num_end += 2; | |
947 | } | |
7010c033 SM |
948 | break; |
949 | case 'm': | |
81684730 JR |
950 | if (*(num_end + 1) == 's') { |
951 | /* Millisecond (ms) */ | |
952 | multiplier = USEC_PER_MSEC; | |
953 | /* Skip the 's' */ | |
954 | num_end++; | |
955 | } else { | |
956 | /* Minute (m) */ | |
957 | multiplier = USEC_PER_MINUTE; | |
958 | } | |
959 | num_end++; | |
7010c033 SM |
960 | break; |
961 | case 's': | |
81684730 JR |
962 | /* Second */ |
963 | multiplier = USEC_PER_SEC; | |
964 | num_end++; | |
965 | break; | |
966 | case 'h': | |
967 | /* Hour */ | |
968 | multiplier = USEC_PER_HOURS; | |
7010c033 SM |
969 | num_end++; |
970 | break; | |
971 | case '\0': | |
972 | break; | |
973 | default: | |
974 | DBG("utils_parse_time_suffix: invalid suffix."); | |
975 | ret = -1; | |
976 | goto end; | |
977 | } | |
978 | ||
979 | /* Check for garbage after the valid input. */ | |
980 | if (num_end != str_end) { | |
981 | DBG("utils_parse_time_suffix: Garbage after time string."); | |
982 | ret = -1; | |
983 | goto end; | |
984 | } | |
985 | ||
986 | *time_us = base_time * multiplier; | |
987 | ||
988 | /* Check for overflow */ | |
989 | if ((*time_us / multiplier) != base_time) { | |
990 | DBG("utils_parse_time_suffix: oops, overflow detected."); | |
991 | ret = -1; | |
992 | goto end; | |
993 | } | |
994 | ||
995 | ret = 0; | |
996 | end: | |
997 | return ret; | |
998 | } | |
999 | ||
cfa9a5a2 DG |
1000 | /* |
1001 | * fls: returns the position of the most significant bit. | |
1002 | * Returns 0 if no bit is set, else returns the position of the most | |
1003 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
1004 | */ | |
1005 | #if defined(__i386) || defined(__x86_64) | |
1006 | static inline unsigned int fls_u32(uint32_t x) | |
1007 | { | |
1008 | int r; | |
1009 | ||
1010 | asm("bsrl %1,%0\n\t" | |
1011 | "jnz 1f\n\t" | |
1012 | "movl $-1,%0\n\t" | |
1013 | "1:\n\t" | |
1014 | : "=r" (r) : "rm" (x)); | |
1015 | return r + 1; | |
1016 | } | |
1017 | #define HAS_FLS_U32 | |
1018 | #endif | |
1019 | ||
a1e4ab8b | 1020 | #if defined(__x86_64) && defined(__LP64__) |
db5be0a3 JG |
1021 | static inline |
1022 | unsigned int fls_u64(uint64_t x) | |
1023 | { | |
1024 | long r; | |
1025 | ||
1026 | asm("bsrq %1,%0\n\t" | |
1027 | "jnz 1f\n\t" | |
1028 | "movq $-1,%0\n\t" | |
1029 | "1:\n\t" | |
1030 | : "=r" (r) : "rm" (x)); | |
1031 | return r + 1; | |
1032 | } | |
1033 | #define HAS_FLS_U64 | |
1034 | #endif | |
1035 | ||
1036 | #ifndef HAS_FLS_U64 | |
1037 | static __attribute__((unused)) | |
1038 | unsigned int fls_u64(uint64_t x) | |
1039 | { | |
1040 | unsigned int r = 64; | |
1041 | ||
1042 | if (!x) | |
1043 | return 0; | |
1044 | ||
1045 | if (!(x & 0xFFFFFFFF00000000ULL)) { | |
1046 | x <<= 32; | |
1047 | r -= 32; | |
1048 | } | |
1049 | if (!(x & 0xFFFF000000000000ULL)) { | |
1050 | x <<= 16; | |
1051 | r -= 16; | |
1052 | } | |
1053 | if (!(x & 0xFF00000000000000ULL)) { | |
1054 | x <<= 8; | |
1055 | r -= 8; | |
1056 | } | |
1057 | if (!(x & 0xF000000000000000ULL)) { | |
1058 | x <<= 4; | |
1059 | r -= 4; | |
1060 | } | |
1061 | if (!(x & 0xC000000000000000ULL)) { | |
1062 | x <<= 2; | |
1063 | r -= 2; | |
1064 | } | |
1065 | if (!(x & 0x8000000000000000ULL)) { | |
1066 | x <<= 1; | |
1067 | r -= 1; | |
1068 | } | |
1069 | return r; | |
1070 | } | |
1071 | #endif | |
1072 | ||
cfa9a5a2 DG |
1073 | #ifndef HAS_FLS_U32 |
1074 | static __attribute__((unused)) unsigned int fls_u32(uint32_t x) | |
1075 | { | |
1076 | unsigned int r = 32; | |
1077 | ||
1078 | if (!x) { | |
1079 | return 0; | |
1080 | } | |
1081 | if (!(x & 0xFFFF0000U)) { | |
1082 | x <<= 16; | |
1083 | r -= 16; | |
1084 | } | |
1085 | if (!(x & 0xFF000000U)) { | |
1086 | x <<= 8; | |
1087 | r -= 8; | |
1088 | } | |
1089 | if (!(x & 0xF0000000U)) { | |
1090 | x <<= 4; | |
1091 | r -= 4; | |
1092 | } | |
1093 | if (!(x & 0xC0000000U)) { | |
1094 | x <<= 2; | |
1095 | r -= 2; | |
1096 | } | |
1097 | if (!(x & 0x80000000U)) { | |
1098 | x <<= 1; | |
1099 | r -= 1; | |
1100 | } | |
1101 | return r; | |
1102 | } | |
1103 | #endif | |
1104 | ||
1105 | /* | |
1106 | * Return the minimum order for which x <= (1UL << order). | |
1107 | * Return -1 if x is 0. | |
1108 | */ | |
1109 | LTTNG_HIDDEN | |
1110 | int utils_get_count_order_u32(uint32_t x) | |
1111 | { | |
1112 | if (!x) { | |
1113 | return -1; | |
1114 | } | |
1115 | ||
1116 | return fls_u32(x - 1); | |
1117 | } | |
feb0f3e5 | 1118 | |
db5be0a3 JG |
1119 | /* |
1120 | * Return the minimum order for which x <= (1UL << order). | |
1121 | * Return -1 if x is 0. | |
1122 | */ | |
1123 | LTTNG_HIDDEN | |
1124 | int utils_get_count_order_u64(uint64_t x) | |
1125 | { | |
1126 | if (!x) { | |
1127 | return -1; | |
1128 | } | |
1129 | ||
1130 | return fls_u64(x - 1); | |
1131 | } | |
1132 | ||
feb0f3e5 AM |
1133 | /** |
1134 | * Obtain the value of LTTNG_HOME environment variable, if exists. | |
1135 | * Otherwise returns the value of HOME. | |
1136 | */ | |
00a52467 | 1137 | LTTNG_HIDDEN |
4f00620d | 1138 | const char *utils_get_home_dir(void) |
feb0f3e5 AM |
1139 | { |
1140 | char *val = NULL; | |
04135dbd DG |
1141 | struct passwd *pwd; |
1142 | ||
e8fa9fb0 | 1143 | val = lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR); |
feb0f3e5 | 1144 | if (val != NULL) { |
04135dbd DG |
1145 | goto end; |
1146 | } | |
e8fa9fb0 | 1147 | val = lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); |
04135dbd DG |
1148 | if (val != NULL) { |
1149 | goto end; | |
feb0f3e5 | 1150 | } |
04135dbd DG |
1151 | |
1152 | /* Fallback on the password file entry. */ | |
1153 | pwd = getpwuid(getuid()); | |
1154 | if (!pwd) { | |
1155 | goto end; | |
1156 | } | |
1157 | val = pwd->pw_dir; | |
1158 | ||
1159 | DBG3("Home directory is '%s'", val); | |
1160 | ||
1161 | end: | |
1162 | return val; | |
feb0f3e5 | 1163 | } |
26fe5938 | 1164 | |
fb198a11 JG |
1165 | /** |
1166 | * Get user's home directory. Dynamically allocated, must be freed | |
1167 | * by the caller. | |
1168 | */ | |
1169 | LTTNG_HIDDEN | |
1170 | char *utils_get_user_home_dir(uid_t uid) | |
1171 | { | |
1172 | struct passwd pwd; | |
1173 | struct passwd *result; | |
1174 | char *home_dir = NULL; | |
1175 | char *buf = NULL; | |
1176 | long buflen; | |
1177 | int ret; | |
1178 | ||
1179 | buflen = sysconf(_SC_GETPW_R_SIZE_MAX); | |
1180 | if (buflen == -1) { | |
1181 | goto end; | |
1182 | } | |
1183 | retry: | |
1184 | buf = zmalloc(buflen); | |
1185 | if (!buf) { | |
1186 | goto end; | |
1187 | } | |
1188 | ||
1189 | ret = getpwuid_r(uid, &pwd, buf, buflen, &result); | |
1190 | if (ret || !result) { | |
1191 | if (ret == ERANGE) { | |
1192 | free(buf); | |
1193 | buflen *= 2; | |
1194 | goto retry; | |
1195 | } | |
1196 | goto end; | |
1197 | } | |
1198 | ||
1199 | home_dir = strdup(pwd.pw_dir); | |
1200 | end: | |
1201 | free(buf); | |
1202 | return home_dir; | |
1203 | } | |
1204 | ||
26fe5938 DG |
1205 | /* |
1206 | * With the given format, fill dst with the time of len maximum siz. | |
1207 | * | |
1208 | * Return amount of bytes set in the buffer or else 0 on error. | |
1209 | */ | |
1210 | LTTNG_HIDDEN | |
1211 | size_t utils_get_current_time_str(const char *format, char *dst, size_t len) | |
1212 | { | |
1213 | size_t ret; | |
1214 | time_t rawtime; | |
1215 | struct tm *timeinfo; | |
1216 | ||
1217 | assert(format); | |
1218 | assert(dst); | |
1219 | ||
1220 | /* Get date and time for session path */ | |
1221 | time(&rawtime); | |
1222 | timeinfo = localtime(&rawtime); | |
1223 | ret = strftime(dst, len, format, timeinfo); | |
1224 | if (ret == 0) { | |
68e6efdd | 1225 | ERR("Unable to strftime with format %s at dst %p of len %zu", format, |
26fe5938 DG |
1226 | dst, len); |
1227 | } | |
1228 | ||
1229 | return ret; | |
1230 | } | |
6c71277b MD |
1231 | |
1232 | /* | |
28ab59d0 JR |
1233 | * Return 0 on success and set *gid to the group_ID matching the passed name. |
1234 | * Else -1 if it cannot be found or an error occurred. | |
6c71277b MD |
1235 | */ |
1236 | LTTNG_HIDDEN | |
28ab59d0 | 1237 | int utils_get_group_id(const char *name, bool warn, gid_t *gid) |
6c71277b | 1238 | { |
28ab59d0 JR |
1239 | static volatile int warn_once; |
1240 | int ret; | |
1241 | long sys_len; | |
1242 | size_t len; | |
1243 | struct group grp; | |
1244 | struct group *result; | |
1245 | struct lttng_dynamic_buffer buffer; | |
1246 | ||
1247 | /* Get the system limit, if it exists. */ | |
1248 | sys_len = sysconf(_SC_GETGR_R_SIZE_MAX); | |
1249 | if (sys_len == -1) { | |
1250 | len = 1024; | |
1251 | } else { | |
1252 | len = (size_t) sys_len; | |
1253 | } | |
1254 | ||
1255 | lttng_dynamic_buffer_init(&buffer); | |
1256 | ret = lttng_dynamic_buffer_set_size(&buffer, len); | |
1257 | if (ret) { | |
1258 | ERR("Failed to allocate group info buffer"); | |
1259 | ret = -1; | |
1260 | goto error; | |
1261 | } | |
6c71277b | 1262 | |
28ab59d0 JR |
1263 | while ((ret = getgrnam_r(name, &grp, buffer.data, buffer.size, &result)) == ERANGE) { |
1264 | const size_t new_len = 2 * buffer.size; | |
6c71277b | 1265 | |
28ab59d0 JR |
1266 | /* Buffer is not big enough, increase its size. */ |
1267 | if (new_len < buffer.size) { | |
1268 | ERR("Group info buffer size overflow"); | |
1269 | ret = -1; | |
1270 | goto error; | |
1271 | } | |
1272 | ||
1273 | ret = lttng_dynamic_buffer_set_size(&buffer, new_len); | |
1274 | if (ret) { | |
1275 | ERR("Failed to grow group info buffer to %zu bytes", | |
1276 | new_len); | |
1277 | ret = -1; | |
1278 | goto error; | |
6c71277b | 1279 | } |
6c71277b | 1280 | } |
28ab59d0 JR |
1281 | if (ret) { |
1282 | PERROR("Failed to get group file entry for group name \"%s\"", | |
1283 | name); | |
1284 | ret = -1; | |
1285 | goto error; | |
1286 | } | |
1287 | ||
1288 | /* Group not found. */ | |
1289 | if (!result) { | |
1290 | ret = -1; | |
1291 | goto error; | |
1292 | } | |
1293 | ||
1294 | *gid = result->gr_gid; | |
1295 | ret = 0; | |
1296 | ||
1297 | error: | |
1298 | if (ret && warn && !warn_once) { | |
1299 | WARN("No tracing group detected"); | |
1300 | warn_once = 1; | |
1301 | } | |
1302 | lttng_dynamic_buffer_reset(&buffer); | |
1303 | return ret; | |
6c71277b | 1304 | } |
8db0dc00 JG |
1305 | |
1306 | /* | |
1307 | * Return a newly allocated option string. This string is to be used as the | |
1308 | * optstring argument of getopt_long(), see GETOPT(3). opt_count is the number | |
1309 | * of elements in the long_options array. Returns NULL if the string's | |
1310 | * allocation fails. | |
1311 | */ | |
1312 | LTTNG_HIDDEN | |
1313 | char *utils_generate_optstring(const struct option *long_options, | |
1314 | size_t opt_count) | |
1315 | { | |
1316 | int i; | |
1317 | size_t string_len = opt_count, str_pos = 0; | |
1318 | char *optstring; | |
1319 | ||
1320 | /* | |
1321 | * Compute the necessary string length. One letter per option, two when an | |
1322 | * argument is necessary, and a trailing NULL. | |
1323 | */ | |
1324 | for (i = 0; i < opt_count; i++) { | |
1325 | string_len += long_options[i].has_arg ? 1 : 0; | |
1326 | } | |
1327 | ||
1328 | optstring = zmalloc(string_len); | |
1329 | if (!optstring) { | |
1330 | goto end; | |
1331 | } | |
1332 | ||
1333 | for (i = 0; i < opt_count; i++) { | |
1334 | if (!long_options[i].name) { | |
1335 | /* Got to the trailing NULL element */ | |
1336 | break; | |
1337 | } | |
1338 | ||
a596dcb9 JG |
1339 | if (long_options[i].val != '\0') { |
1340 | optstring[str_pos++] = (char) long_options[i].val; | |
1341 | if (long_options[i].has_arg) { | |
1342 | optstring[str_pos++] = ':'; | |
1343 | } | |
8db0dc00 JG |
1344 | } |
1345 | } | |
1346 | ||
1347 | end: | |
1348 | return optstring; | |
1349 | } | |
3d071855 MD |
1350 | |
1351 | /* | |
1352 | * Try to remove a hierarchy of empty directories, recursively. Don't unlink | |
9529ec1b | 1353 | * any file. Try to rmdir any empty directory within the hierarchy. |
3d071855 MD |
1354 | */ |
1355 | LTTNG_HIDDEN | |
1356 | int utils_recursive_rmdir(const char *path) | |
1357 | { | |
93bed9fe | 1358 | int ret; |
cbf53d23 | 1359 | struct lttng_directory_handle *handle; |
7a946beb | 1360 | |
cbf53d23 JG |
1361 | handle = lttng_directory_handle_create(NULL); |
1362 | if (!handle) { | |
1363 | ret = -1; | |
93bed9fe | 1364 | goto end; |
3d071855 | 1365 | } |
cbf53d23 | 1366 | ret = lttng_directory_handle_remove_subdirectory(handle, path); |
3d071855 | 1367 | end: |
cbf53d23 | 1368 | lttng_directory_handle_put(handle); |
3d071855 MD |
1369 | return ret; |
1370 | } | |
93ec662e JD |
1371 | |
1372 | LTTNG_HIDDEN | |
1373 | int utils_truncate_stream_file(int fd, off_t length) | |
1374 | { | |
1375 | int ret; | |
a5df8828 | 1376 | off_t lseek_ret; |
93ec662e JD |
1377 | |
1378 | ret = ftruncate(fd, length); | |
1379 | if (ret < 0) { | |
1380 | PERROR("ftruncate"); | |
1381 | goto end; | |
1382 | } | |
a5df8828 GL |
1383 | lseek_ret = lseek(fd, length, SEEK_SET); |
1384 | if (lseek_ret < 0) { | |
93ec662e | 1385 | PERROR("lseek"); |
a5df8828 | 1386 | ret = -1; |
93ec662e JD |
1387 | goto end; |
1388 | } | |
93ec662e JD |
1389 | end: |
1390 | return ret; | |
1391 | } | |
4ba92f18 PP |
1392 | |
1393 | static const char *get_man_bin_path(void) | |
1394 | { | |
b7dce40d | 1395 | char *env_man_path = lttng_secure_getenv(DEFAULT_MAN_BIN_PATH_ENV); |
4ba92f18 PP |
1396 | |
1397 | if (env_man_path) { | |
1398 | return env_man_path; | |
1399 | } | |
1400 | ||
1401 | return DEFAULT_MAN_BIN_PATH; | |
1402 | } | |
1403 | ||
1404 | LTTNG_HIDDEN | |
4fc83d94 PP |
1405 | int utils_show_help(int section, const char *page_name, |
1406 | const char *help_msg) | |
4ba92f18 PP |
1407 | { |
1408 | char section_string[8]; | |
1409 | const char *man_bin_path = get_man_bin_path(); | |
4fc83d94 PP |
1410 | int ret = 0; |
1411 | ||
1412 | if (help_msg) { | |
1413 | printf("%s", help_msg); | |
1414 | goto end; | |
1415 | } | |
4ba92f18 PP |
1416 | |
1417 | /* Section integer -> section string */ | |
1418 | ret = sprintf(section_string, "%d", section); | |
1419 | assert(ret > 0 && ret < 8); | |
1420 | ||
1421 | /* | |
1422 | * Execute man pager. | |
1423 | * | |
b07e7ef0 | 1424 | * We provide -M to man here because LTTng-tools can |
4ba92f18 PP |
1425 | * be installed outside /usr, in which case its man pages are |
1426 | * not located in the default /usr/share/man directory. | |
1427 | */ | |
b07e7ef0 | 1428 | ret = execlp(man_bin_path, "man", "-M", MANPATH, |
4ba92f18 | 1429 | section_string, page_name, NULL); |
4fc83d94 PP |
1430 | |
1431 | end: | |
4ba92f18 PP |
1432 | return ret; |
1433 | } | |
09b72f7a FD |
1434 | |
1435 | static | |
1436 | int read_proc_meminfo_field(const char *field, size_t *value) | |
1437 | { | |
1438 | int ret; | |
1439 | FILE *proc_meminfo; | |
1440 | char name[PROC_MEMINFO_FIELD_MAX_NAME_LEN] = {}; | |
1441 | ||
1442 | proc_meminfo = fopen(PROC_MEMINFO_PATH, "r"); | |
1443 | if (!proc_meminfo) { | |
1444 | PERROR("Failed to fopen() " PROC_MEMINFO_PATH); | |
1445 | ret = -1; | |
1446 | goto fopen_error; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Read the contents of /proc/meminfo line by line to find the right | |
1451 | * field. | |
1452 | */ | |
1453 | while (!feof(proc_meminfo)) { | |
1454 | unsigned long value_kb; | |
1455 | ||
1456 | ret = fscanf(proc_meminfo, | |
1457 | "%" MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "s %lu kB\n", | |
1458 | name, &value_kb); | |
1459 | if (ret == EOF) { | |
1460 | /* | |
1461 | * fscanf() returning EOF can indicate EOF or an error. | |
1462 | */ | |
1463 | if (ferror(proc_meminfo)) { | |
1464 | PERROR("Failed to parse " PROC_MEMINFO_PATH); | |
1465 | } | |
1466 | break; | |
1467 | } | |
1468 | ||
1469 | if (ret == 2 && strcmp(name, field) == 0) { | |
1470 | /* | |
1471 | * This number is displayed in kilo-bytes. Return the | |
1472 | * number of bytes. | |
1473 | */ | |
1474 | *value = ((size_t) value_kb) * 1024; | |
1475 | ret = 0; | |
1476 | goto found; | |
1477 | } | |
1478 | } | |
1479 | /* Reached the end of the file without finding the right field. */ | |
1480 | ret = -1; | |
1481 | ||
1482 | found: | |
1483 | fclose(proc_meminfo); | |
1484 | fopen_error: | |
1485 | return ret; | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Returns an estimate of the number of bytes of memory available based on the | |
1490 | * the information in `/proc/meminfo`. The number returned by this function is | |
1491 | * a best guess. | |
1492 | */ | |
1493 | LTTNG_HIDDEN | |
1494 | int utils_get_memory_available(size_t *value) | |
1495 | { | |
1496 | return read_proc_meminfo_field(PROC_MEMINFO_MEMAVAILABLE_LINE, value); | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Returns the total size of the memory on the system in bytes based on the | |
1501 | * the information in `/proc/meminfo`. | |
1502 | */ | |
1503 | LTTNG_HIDDEN | |
1504 | int utils_get_memory_total(size_t *value) | |
1505 | { | |
1506 | return read_proc_meminfo_field(PROC_MEMINFO_MEMTOTAL_LINE, value); | |
1507 | } | |
ce9ee1fb JR |
1508 | |
1509 | LTTNG_HIDDEN | |
1510 | int utils_change_working_directory(const char *path) | |
1511 | { | |
1512 | int ret; | |
1513 | ||
1514 | assert(path); | |
1515 | ||
1516 | DBG("Changing working directory to \"%s\"", path); | |
1517 | ret = chdir(path); | |
1518 | if (ret) { | |
1519 | PERROR("Failed to change working directory to \"%s\"", path); | |
1520 | goto end; | |
1521 | } | |
1522 | ||
1523 | /* Check for write access */ | |
1524 | if (access(path, W_OK)) { | |
1525 | if (errno == EACCES) { | |
1526 | /* | |
1527 | * Do not treat this as an error since the permission | |
1528 | * might change in the lifetime of the process | |
1529 | */ | |
1530 | DBG("Working directory \"%s\" is not writable", path); | |
1531 | } else { | |
1532 | PERROR("Failed to check if working directory \"%s\" is writable", | |
1533 | path); | |
1534 | } | |
1535 | } | |
1536 | ||
1537 | end: | |
1538 | return ret; | |
1539 | } |