Commit | Line | Data |
---|---|---|
81b86775 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2012 David Goulet <dgoulet@efficios.com> |
ab5be9fa | 3 | * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
81b86775 | 4 | * |
395004a1 | 5 | * SPDX-License-Identifier: LGPL-2.1-only |
81b86775 | 6 | * |
81b86775 DG |
7 | */ |
8 | ||
159b042f | 9 | #include "common/macros.h" |
d72eb77f | 10 | #include <stdint.h> |
6c1c0768 | 11 | #define _LGPL_SOURCE |
35f90c40 | 12 | #include <assert.h> |
81b86775 DG |
13 | #include <ctype.h> |
14 | #include <fcntl.h> | |
15 | #include <limits.h> | |
16 | #include <stdlib.h> | |
2d851108 | 17 | #include <sys/stat.h> |
0c7bcad5 | 18 | #include <sys/types.h> |
2d851108 | 19 | #include <unistd.h> |
fe4477ee | 20 | #include <inttypes.h> |
6c71277b | 21 | #include <grp.h> |
fb198a11 | 22 | #include <pwd.h> |
c9cb3e7d | 23 | #include <sys/file.h> |
a98e236e | 24 | #include <unistd.h> |
81b86775 DG |
25 | |
26 | #include <common/common.h> | |
09b72f7a | 27 | #include <common/readwrite.h> |
fe4477ee | 28 | #include <common/runas.h> |
e8fa9fb0 | 29 | #include <common/compat/getenv.h> |
f5436bfc | 30 | #include <common/compat/string.h> |
5a2451c9 | 31 | #include <common/compat/dirent.h> |
18710679 | 32 | #include <common/compat/directory-handle.h> |
28ab59d0 | 33 | #include <common/dynamic-buffer.h> |
40804255 | 34 | #include <common/string-utils/format.h> |
d7c23421 | 35 | #include <lttng/constant.h> |
81b86775 DG |
36 | |
37 | #include "utils.h" | |
feb0f3e5 | 38 | #include "defaults.h" |
2daf6502 | 39 | #include "time.h" |
81b86775 | 40 | |
09b72f7a FD |
41 | #define PROC_MEMINFO_PATH "/proc/meminfo" |
42 | #define PROC_MEMINFO_MEMAVAILABLE_LINE "MemAvailable:" | |
43 | #define PROC_MEMINFO_MEMTOTAL_LINE "MemTotal:" | |
44 | ||
45 | /* The length of the longest field of `/proc/meminfo`. */ | |
46 | #define PROC_MEMINFO_FIELD_MAX_NAME_LEN 20 | |
47 | ||
48 | #if (PROC_MEMINFO_FIELD_MAX_NAME_LEN == 20) | |
49 | #define MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "19" | |
50 | #else | |
51 | #error MAX_NAME_LEN_SCANF_IS_A_BROKEN_API must be updated to match (PROC_MEMINFO_FIELD_MAX_NAME_LEN - 1) | |
52 | #endif | |
53 | ||
159b042f JG |
54 | #define FALLBACK_USER_BUFLEN 16384 |
55 | #define FALLBACK_GROUP_BUFLEN 16384 | |
56 | ||
81b86775 DG |
57 | /* |
58 | * Create a pipe in dst. | |
59 | */ | |
90e535ef | 60 | LTTNG_HIDDEN |
81b86775 DG |
61 | int utils_create_pipe(int *dst) |
62 | { | |
63 | int ret; | |
64 | ||
65 | if (dst == NULL) { | |
66 | return -1; | |
67 | } | |
68 | ||
69 | ret = pipe(dst); | |
70 | if (ret < 0) { | |
71 | PERROR("create pipe"); | |
72 | } | |
73 | ||
74 | return ret; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Create pipe and set CLOEXEC flag to both fd. | |
79 | * | |
80 | * Make sure the pipe opened by this function are closed at some point. Use | |
81 | * utils_close_pipe(). | |
82 | */ | |
90e535ef | 83 | LTTNG_HIDDEN |
81b86775 DG |
84 | int utils_create_pipe_cloexec(int *dst) |
85 | { | |
86 | int ret, i; | |
87 | ||
88 | if (dst == NULL) { | |
89 | return -1; | |
90 | } | |
91 | ||
92 | ret = utils_create_pipe(dst); | |
93 | if (ret < 0) { | |
94 | goto error; | |
95 | } | |
96 | ||
97 | for (i = 0; i < 2; i++) { | |
98 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
99 | if (ret < 0) { | |
100 | PERROR("fcntl pipe cloexec"); | |
101 | goto error; | |
102 | } | |
103 | } | |
104 | ||
105 | error: | |
106 | return ret; | |
107 | } | |
108 | ||
094f381c MD |
109 | /* |
110 | * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK. | |
111 | * | |
112 | * Make sure the pipe opened by this function are closed at some point. Use | |
113 | * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to | |
114 | * support OSes other than Linux 2.6.23+. | |
115 | */ | |
116 | LTTNG_HIDDEN | |
117 | int utils_create_pipe_cloexec_nonblock(int *dst) | |
118 | { | |
119 | int ret, i; | |
120 | ||
121 | if (dst == NULL) { | |
122 | return -1; | |
123 | } | |
124 | ||
125 | ret = utils_create_pipe(dst); | |
126 | if (ret < 0) { | |
127 | goto error; | |
128 | } | |
129 | ||
130 | for (i = 0; i < 2; i++) { | |
131 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
132 | if (ret < 0) { | |
133 | PERROR("fcntl pipe cloexec"); | |
134 | goto error; | |
135 | } | |
136 | /* | |
137 | * Note: we override any flag that could have been | |
138 | * previously set on the fd. | |
139 | */ | |
140 | ret = fcntl(dst[i], F_SETFL, O_NONBLOCK); | |
141 | if (ret < 0) { | |
142 | PERROR("fcntl pipe nonblock"); | |
143 | goto error; | |
144 | } | |
145 | } | |
146 | ||
147 | error: | |
148 | return ret; | |
149 | } | |
150 | ||
81b86775 DG |
151 | /* |
152 | * Close both read and write side of the pipe. | |
153 | */ | |
90e535ef | 154 | LTTNG_HIDDEN |
81b86775 DG |
155 | void utils_close_pipe(int *src) |
156 | { | |
157 | int i, ret; | |
158 | ||
159 | if (src == NULL) { | |
160 | return; | |
161 | } | |
162 | ||
163 | for (i = 0; i < 2; i++) { | |
164 | /* Safety check */ | |
165 | if (src[i] < 0) { | |
166 | continue; | |
167 | } | |
168 | ||
169 | ret = close(src[i]); | |
170 | if (ret) { | |
171 | PERROR("close pipe"); | |
172 | } | |
11f8d2f7 | 173 | src[i] = -1; |
81b86775 DG |
174 | } |
175 | } | |
a4b92340 DG |
176 | |
177 | /* | |
178 | * Create a new string using two strings range. | |
179 | */ | |
90e535ef | 180 | LTTNG_HIDDEN |
a4b92340 DG |
181 | char *utils_strdupdelim(const char *begin, const char *end) |
182 | { | |
183 | char *str; | |
184 | ||
185 | str = zmalloc(end - begin + 1); | |
186 | if (str == NULL) { | |
187 | PERROR("zmalloc strdupdelim"); | |
188 | goto error; | |
189 | } | |
190 | ||
191 | memcpy(str, begin, end - begin); | |
192 | str[end - begin] = '\0'; | |
193 | ||
194 | error: | |
195 | return str; | |
196 | } | |
b662582b DG |
197 | |
198 | /* | |
199 | * Set CLOEXEC flag to the give file descriptor. | |
200 | */ | |
90e535ef | 201 | LTTNG_HIDDEN |
b662582b DG |
202 | int utils_set_fd_cloexec(int fd) |
203 | { | |
204 | int ret; | |
205 | ||
206 | if (fd < 0) { | |
207 | ret = -EINVAL; | |
208 | goto end; | |
209 | } | |
210 | ||
211 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); | |
212 | if (ret < 0) { | |
213 | PERROR("fcntl cloexec"); | |
214 | ret = -errno; | |
215 | } | |
216 | ||
217 | end: | |
218 | return ret; | |
219 | } | |
35f90c40 DG |
220 | |
221 | /* | |
222 | * Create pid file to the given path and filename. | |
223 | */ | |
90e535ef | 224 | LTTNG_HIDDEN |
35f90c40 DG |
225 | int utils_create_pid_file(pid_t pid, const char *filepath) |
226 | { | |
0f8f94b1 JR |
227 | int ret, fd = -1; |
228 | FILE *fp = NULL; | |
35f90c40 DG |
229 | |
230 | assert(filepath); | |
231 | ||
0f8f94b1 JR |
232 | fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR |S_IWUSR | S_IRGRP | S_IROTH); |
233 | if (fd < 0) { | |
234 | PERROR("open file %s", filepath); | |
235 | ret = -1; | |
236 | goto error; | |
237 | } | |
238 | ||
239 | fp = fdopen(fd, "w"); | |
35f90c40 | 240 | if (fp == NULL) { |
0f8f94b1 | 241 | PERROR("fdopen file %s", filepath); |
35f90c40 | 242 | ret = -1; |
c6b1a4a6 JG |
243 | if (close(fd)) { |
244 | PERROR("Failed to close `%s` file descriptor while handling fdopen error", filepath); | |
245 | } | |
246 | ||
35f90c40 DG |
247 | goto error; |
248 | } | |
249 | ||
d1f721c5 | 250 | ret = fprintf(fp, "%d\n", (int) pid); |
35f90c40 | 251 | if (ret < 0) { |
0f8f94b1 JR |
252 | PERROR("fprintf file %s", filepath); |
253 | ret = -1; | |
e205d79b | 254 | goto error; |
35f90c40 DG |
255 | } |
256 | ||
0f8f94b1 | 257 | DBG("'%d' written in file %s", (int) pid, filepath); |
e205d79b | 258 | ret = 0; |
0f8f94b1 | 259 | |
35f90c40 | 260 | error: |
0f8f94b1 JR |
261 | if (fp && fclose(fp)) { |
262 | PERROR("fclose file %s", filepath); | |
263 | } | |
35f90c40 DG |
264 | return ret; |
265 | } | |
2d851108 | 266 | |
c9cb3e7d JG |
267 | /* |
268 | * Create lock file to the given path and filename. | |
269 | * Returns the associated file descriptor, -1 on error. | |
270 | */ | |
271 | LTTNG_HIDDEN | |
272 | int utils_create_lock_file(const char *filepath) | |
273 | { | |
274 | int ret; | |
275 | int fd; | |
77e7fddf | 276 | struct flock lock; |
c9cb3e7d JG |
277 | |
278 | assert(filepath); | |
279 | ||
77e7fddf MJ |
280 | memset(&lock, 0, sizeof(lock)); |
281 | fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | | |
282 | S_IRGRP | S_IWGRP); | |
c9cb3e7d JG |
283 | if (fd < 0) { |
284 | PERROR("open lock file %s", filepath); | |
e6576ba2 | 285 | fd = -1; |
c9cb3e7d JG |
286 | goto error; |
287 | } | |
288 | ||
289 | /* | |
290 | * Attempt to lock the file. If this fails, there is | |
291 | * already a process using the same lock file running | |
292 | * and we should exit. | |
293 | */ | |
77e7fddf MJ |
294 | lock.l_whence = SEEK_SET; |
295 | lock.l_type = F_WRLCK; | |
296 | ||
297 | ret = fcntl(fd, F_SETLK, &lock); | |
298 | if (ret == -1) { | |
299 | PERROR("fcntl lock file"); | |
208ff148 | 300 | ERR("Could not get lock file %s, another instance is running.", |
c9cb3e7d | 301 | filepath); |
ffb0b851 JG |
302 | if (close(fd)) { |
303 | PERROR("close lock file"); | |
304 | } | |
c9cb3e7d JG |
305 | fd = ret; |
306 | goto error; | |
307 | } | |
308 | ||
309 | error: | |
310 | return fd; | |
311 | } | |
312 | ||
2d851108 | 313 | /* |
d77dded2 | 314 | * Create directory using the given path and mode. |
2d851108 DG |
315 | * |
316 | * On success, return 0 else a negative error code. | |
317 | */ | |
90e535ef | 318 | LTTNG_HIDDEN |
d77dded2 JG |
319 | int utils_mkdir(const char *path, mode_t mode, int uid, int gid) |
320 | { | |
321 | int ret; | |
cbf53d23 | 322 | struct lttng_directory_handle *handle; |
69e3a560 | 323 | const struct lttng_credentials creds = { |
ff588497 JR |
324 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), |
325 | .gid = LTTNG_OPTIONAL_INIT_VALUE(gid), | |
18710679 JG |
326 | }; |
327 | ||
cbf53d23 JG |
328 | handle = lttng_directory_handle_create(NULL); |
329 | if (!handle) { | |
330 | ret = -1; | |
fd774fc6 JG |
331 | goto end; |
332 | } | |
18710679 | 333 | ret = lttng_directory_handle_create_subdirectory_as_user( |
cbf53d23 | 334 | handle, path, mode, |
18710679 | 335 | (uid >= 0 || gid >= 0) ? &creds : NULL); |
fd774fc6 | 336 | end: |
cbf53d23 | 337 | lttng_directory_handle_put(handle); |
2d851108 DG |
338 | return ret; |
339 | } | |
fe4477ee | 340 | |
d77dded2 JG |
341 | /* |
342 | * Recursively create directory using the given path and mode, under the | |
343 | * provided uid and gid. | |
344 | * | |
345 | * On success, return 0 else a negative error code. | |
346 | */ | |
347 | LTTNG_HIDDEN | |
348 | int utils_mkdir_recursive(const char *path, mode_t mode, int uid, int gid) | |
349 | { | |
350 | int ret; | |
cbf53d23 | 351 | struct lttng_directory_handle *handle; |
69e3a560 | 352 | const struct lttng_credentials creds = { |
ff588497 JR |
353 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), |
354 | .gid = LTTNG_OPTIONAL_INIT_VALUE(gid), | |
18710679 JG |
355 | }; |
356 | ||
cbf53d23 JG |
357 | handle = lttng_directory_handle_create(NULL); |
358 | if (!handle) { | |
359 | ret = -1; | |
fd774fc6 JG |
360 | goto end; |
361 | } | |
18710679 | 362 | ret = lttng_directory_handle_create_subdirectory_recursive_as_user( |
cbf53d23 | 363 | handle, path, mode, |
18710679 | 364 | (uid >= 0 || gid >= 0) ? &creds : NULL); |
fd774fc6 | 365 | end: |
cbf53d23 | 366 | lttng_directory_handle_put(handle); |
d77dded2 JG |
367 | return ret; |
368 | } | |
369 | ||
fe4477ee | 370 | /* |
40804255 | 371 | * out_stream_path is the output parameter. |
fe4477ee JD |
372 | * |
373 | * Return 0 on success or else a negative value. | |
374 | */ | |
40804255 JG |
375 | LTTNG_HIDDEN |
376 | int utils_stream_file_path(const char *path_name, const char *file_name, | |
377 | uint64_t size, uint64_t count, const char *suffix, | |
378 | char *out_stream_path, size_t stream_path_len) | |
fe4477ee | 379 | { |
7591bab1 | 380 | int ret; |
d6d89e4c | 381 | char count_str[MAX_INT_DEC_LEN(count) + 1] = {}; |
40804255 | 382 | const char *path_separator; |
fe4477ee | 383 | |
d248f3c2 MD |
384 | if (path_name && (path_name[0] == '\0' || |
385 | path_name[strlen(path_name) - 1] == '/')) { | |
40804255 JG |
386 | path_separator = ""; |
387 | } else { | |
388 | path_separator = "/"; | |
fe4477ee JD |
389 | } |
390 | ||
40804255 JG |
391 | path_name = path_name ? : ""; |
392 | suffix = suffix ? : ""; | |
393 | if (size > 0) { | |
394 | ret = snprintf(count_str, sizeof(count_str), "_%" PRIu64, | |
395 | count); | |
396 | assert(ret > 0 && ret < sizeof(count_str)); | |
309167d2 JD |
397 | } |
398 | ||
d6d89e4c | 399 | ret = snprintf(out_stream_path, stream_path_len, "%s%s%s%s%s", |
40804255 JG |
400 | path_name, path_separator, file_name, count_str, |
401 | suffix); | |
402 | if (ret < 0 || ret >= stream_path_len) { | |
403 | ERR("Truncation occurred while formatting stream path"); | |
404 | ret = -1; | |
fe4477ee | 405 | } else { |
40804255 | 406 | ret = 0; |
7591bab1 | 407 | } |
7591bab1 MD |
408 | return ret; |
409 | } | |
410 | ||
70d0b120 SM |
411 | /** |
412 | * Parse a string that represents a size in human readable format. It | |
5983a922 | 413 | * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'. |
70d0b120 SM |
414 | * |
415 | * The suffix multiply the integer by: | |
416 | * 'k': 1024 | |
417 | * 'M': 1024^2 | |
418 | * 'G': 1024^3 | |
419 | * | |
420 | * @param str The string to parse. | |
5983a922 | 421 | * @param size Pointer to a uint64_t that will be filled with the |
cfa9a5a2 | 422 | * resulting size. |
70d0b120 SM |
423 | * |
424 | * @return 0 on success, -1 on failure. | |
425 | */ | |
00a52467 | 426 | LTTNG_HIDDEN |
5983a922 | 427 | int utils_parse_size_suffix(const char * const str, uint64_t * const size) |
70d0b120 | 428 | { |
70d0b120 | 429 | int ret; |
5983a922 | 430 | uint64_t base_size; |
70d0b120 | 431 | long shift = 0; |
5983a922 SM |
432 | const char *str_end; |
433 | char *num_end; | |
70d0b120 SM |
434 | |
435 | if (!str) { | |
5983a922 | 436 | DBG("utils_parse_size_suffix: received a NULL string."); |
70d0b120 SM |
437 | ret = -1; |
438 | goto end; | |
439 | } | |
440 | ||
5983a922 SM |
441 | /* strtoull will accept a negative number, but we don't want to. */ |
442 | if (strchr(str, '-') != NULL) { | |
443 | DBG("utils_parse_size_suffix: invalid size string, should not contain '-'."); | |
70d0b120 | 444 | ret = -1; |
5983a922 | 445 | goto end; |
70d0b120 SM |
446 | } |
447 | ||
5983a922 SM |
448 | /* str_end will point to the \0 */ |
449 | str_end = str + strlen(str); | |
70d0b120 | 450 | errno = 0; |
5983a922 | 451 | base_size = strtoull(str, &num_end, 0); |
70d0b120 | 452 | if (errno != 0) { |
5983a922 | 453 | PERROR("utils_parse_size_suffix strtoull"); |
70d0b120 | 454 | ret = -1; |
5983a922 SM |
455 | goto end; |
456 | } | |
457 | ||
458 | if (num_end == str) { | |
459 | /* strtoull parsed nothing, not good. */ | |
460 | DBG("utils_parse_size_suffix: strtoull had nothing good to parse."); | |
461 | ret = -1; | |
462 | goto end; | |
463 | } | |
464 | ||
465 | /* Check if a prefix is present. */ | |
466 | switch (*num_end) { | |
467 | case 'G': | |
468 | shift = GIBI_LOG2; | |
469 | num_end++; | |
470 | break; | |
471 | case 'M': /* */ | |
472 | shift = MEBI_LOG2; | |
473 | num_end++; | |
474 | break; | |
475 | case 'K': | |
476 | case 'k': | |
477 | shift = KIBI_LOG2; | |
478 | num_end++; | |
479 | break; | |
480 | case '\0': | |
481 | break; | |
482 | default: | |
483 | DBG("utils_parse_size_suffix: invalid suffix."); | |
484 | ret = -1; | |
485 | goto end; | |
486 | } | |
487 | ||
488 | /* Check for garbage after the valid input. */ | |
489 | if (num_end != str_end) { | |
490 | DBG("utils_parse_size_suffix: Garbage after size string."); | |
491 | ret = -1; | |
492 | goto end; | |
70d0b120 SM |
493 | } |
494 | ||
495 | *size = base_size << shift; | |
496 | ||
497 | /* Check for overflow */ | |
498 | if ((*size >> shift) != base_size) { | |
5983a922 | 499 | DBG("utils_parse_size_suffix: oops, overflow detected."); |
70d0b120 | 500 | ret = -1; |
5983a922 | 501 | goto end; |
70d0b120 SM |
502 | } |
503 | ||
504 | ret = 0; | |
70d0b120 SM |
505 | end: |
506 | return ret; | |
507 | } | |
cfa9a5a2 | 508 | |
7010c033 SM |
509 | /** |
510 | * Parse a string that represents a time in human readable format. It | |
81684730 JR |
511 | * supports decimal integers suffixed by: |
512 | * "us" for microsecond, | |
513 | * "ms" for millisecond, | |
514 | * "s" for second, | |
515 | * "m" for minute, | |
516 | * "h" for hour | |
7010c033 SM |
517 | * |
518 | * The suffix multiply the integer by: | |
81684730 JR |
519 | * "us" : 1 |
520 | * "ms" : 1000 | |
521 | * "s" : 1000000 | |
522 | * "m" : 60000000 | |
523 | * "h" : 3600000000 | |
7010c033 SM |
524 | * |
525 | * Note that unit-less numbers are assumed to be microseconds. | |
526 | * | |
527 | * @param str The string to parse, assumed to be NULL-terminated. | |
528 | * @param time_us Pointer to a uint64_t that will be filled with the | |
529 | * resulting time in microseconds. | |
530 | * | |
531 | * @return 0 on success, -1 on failure. | |
532 | */ | |
533 | LTTNG_HIDDEN | |
534 | int utils_parse_time_suffix(char const * const str, uint64_t * const time_us) | |
535 | { | |
536 | int ret; | |
537 | uint64_t base_time; | |
81684730 | 538 | uint64_t multiplier = 1; |
7010c033 SM |
539 | const char *str_end; |
540 | char *num_end; | |
541 | ||
542 | if (!str) { | |
543 | DBG("utils_parse_time_suffix: received a NULL string."); | |
544 | ret = -1; | |
545 | goto end; | |
546 | } | |
547 | ||
548 | /* strtoull will accept a negative number, but we don't want to. */ | |
549 | if (strchr(str, '-') != NULL) { | |
550 | DBG("utils_parse_time_suffix: invalid time string, should not contain '-'."); | |
551 | ret = -1; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | /* str_end will point to the \0 */ | |
556 | str_end = str + strlen(str); | |
557 | errno = 0; | |
558 | base_time = strtoull(str, &num_end, 10); | |
559 | if (errno != 0) { | |
560 | PERROR("utils_parse_time_suffix strtoull on string \"%s\"", str); | |
561 | ret = -1; | |
562 | goto end; | |
563 | } | |
564 | ||
565 | if (num_end == str) { | |
566 | /* strtoull parsed nothing, not good. */ | |
567 | DBG("utils_parse_time_suffix: strtoull had nothing good to parse."); | |
568 | ret = -1; | |
569 | goto end; | |
570 | } | |
571 | ||
572 | /* Check if a prefix is present. */ | |
573 | switch (*num_end) { | |
574 | case 'u': | |
81684730 JR |
575 | /* |
576 | * Microsecond (us) | |
577 | * | |
578 | * Skip the "us" if the string matches the "us" suffix, | |
579 | * otherwise let the check for the end of the string handle | |
580 | * the error reporting. | |
581 | */ | |
582 | if (*(num_end + 1) == 's') { | |
583 | num_end += 2; | |
584 | } | |
7010c033 SM |
585 | break; |
586 | case 'm': | |
81684730 JR |
587 | if (*(num_end + 1) == 's') { |
588 | /* Millisecond (ms) */ | |
589 | multiplier = USEC_PER_MSEC; | |
590 | /* Skip the 's' */ | |
591 | num_end++; | |
592 | } else { | |
593 | /* Minute (m) */ | |
594 | multiplier = USEC_PER_MINUTE; | |
595 | } | |
596 | num_end++; | |
7010c033 SM |
597 | break; |
598 | case 's': | |
81684730 JR |
599 | /* Second */ |
600 | multiplier = USEC_PER_SEC; | |
601 | num_end++; | |
602 | break; | |
603 | case 'h': | |
604 | /* Hour */ | |
605 | multiplier = USEC_PER_HOURS; | |
7010c033 SM |
606 | num_end++; |
607 | break; | |
608 | case '\0': | |
609 | break; | |
610 | default: | |
611 | DBG("utils_parse_time_suffix: invalid suffix."); | |
612 | ret = -1; | |
613 | goto end; | |
614 | } | |
615 | ||
616 | /* Check for garbage after the valid input. */ | |
617 | if (num_end != str_end) { | |
618 | DBG("utils_parse_time_suffix: Garbage after time string."); | |
619 | ret = -1; | |
620 | goto end; | |
621 | } | |
622 | ||
623 | *time_us = base_time * multiplier; | |
624 | ||
625 | /* Check for overflow */ | |
626 | if ((*time_us / multiplier) != base_time) { | |
627 | DBG("utils_parse_time_suffix: oops, overflow detected."); | |
628 | ret = -1; | |
629 | goto end; | |
630 | } | |
631 | ||
632 | ret = 0; | |
633 | end: | |
634 | return ret; | |
635 | } | |
636 | ||
cfa9a5a2 DG |
637 | /* |
638 | * fls: returns the position of the most significant bit. | |
639 | * Returns 0 if no bit is set, else returns the position of the most | |
640 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
641 | */ | |
642 | #if defined(__i386) || defined(__x86_64) | |
643 | static inline unsigned int fls_u32(uint32_t x) | |
644 | { | |
645 | int r; | |
646 | ||
647 | asm("bsrl %1,%0\n\t" | |
648 | "jnz 1f\n\t" | |
649 | "movl $-1,%0\n\t" | |
650 | "1:\n\t" | |
651 | : "=r" (r) : "rm" (x)); | |
652 | return r + 1; | |
653 | } | |
654 | #define HAS_FLS_U32 | |
655 | #endif | |
656 | ||
a1e4ab8b | 657 | #if defined(__x86_64) && defined(__LP64__) |
db5be0a3 JG |
658 | static inline |
659 | unsigned int fls_u64(uint64_t x) | |
660 | { | |
661 | long r; | |
662 | ||
663 | asm("bsrq %1,%0\n\t" | |
664 | "jnz 1f\n\t" | |
665 | "movq $-1,%0\n\t" | |
666 | "1:\n\t" | |
667 | : "=r" (r) : "rm" (x)); | |
668 | return r + 1; | |
669 | } | |
670 | #define HAS_FLS_U64 | |
671 | #endif | |
672 | ||
673 | #ifndef HAS_FLS_U64 | |
674 | static __attribute__((unused)) | |
675 | unsigned int fls_u64(uint64_t x) | |
676 | { | |
677 | unsigned int r = 64; | |
678 | ||
679 | if (!x) | |
680 | return 0; | |
681 | ||
682 | if (!(x & 0xFFFFFFFF00000000ULL)) { | |
683 | x <<= 32; | |
684 | r -= 32; | |
685 | } | |
686 | if (!(x & 0xFFFF000000000000ULL)) { | |
687 | x <<= 16; | |
688 | r -= 16; | |
689 | } | |
690 | if (!(x & 0xFF00000000000000ULL)) { | |
691 | x <<= 8; | |
692 | r -= 8; | |
693 | } | |
694 | if (!(x & 0xF000000000000000ULL)) { | |
695 | x <<= 4; | |
696 | r -= 4; | |
697 | } | |
698 | if (!(x & 0xC000000000000000ULL)) { | |
699 | x <<= 2; | |
700 | r -= 2; | |
701 | } | |
702 | if (!(x & 0x8000000000000000ULL)) { | |
703 | x <<= 1; | |
704 | r -= 1; | |
705 | } | |
706 | return r; | |
707 | } | |
708 | #endif | |
709 | ||
cfa9a5a2 DG |
710 | #ifndef HAS_FLS_U32 |
711 | static __attribute__((unused)) unsigned int fls_u32(uint32_t x) | |
712 | { | |
713 | unsigned int r = 32; | |
714 | ||
715 | if (!x) { | |
716 | return 0; | |
717 | } | |
718 | if (!(x & 0xFFFF0000U)) { | |
719 | x <<= 16; | |
720 | r -= 16; | |
721 | } | |
722 | if (!(x & 0xFF000000U)) { | |
723 | x <<= 8; | |
724 | r -= 8; | |
725 | } | |
726 | if (!(x & 0xF0000000U)) { | |
727 | x <<= 4; | |
728 | r -= 4; | |
729 | } | |
730 | if (!(x & 0xC0000000U)) { | |
731 | x <<= 2; | |
732 | r -= 2; | |
733 | } | |
734 | if (!(x & 0x80000000U)) { | |
735 | x <<= 1; | |
736 | r -= 1; | |
737 | } | |
738 | return r; | |
739 | } | |
740 | #endif | |
741 | ||
742 | /* | |
743 | * Return the minimum order for which x <= (1UL << order). | |
744 | * Return -1 if x is 0. | |
745 | */ | |
746 | LTTNG_HIDDEN | |
747 | int utils_get_count_order_u32(uint32_t x) | |
748 | { | |
749 | if (!x) { | |
750 | return -1; | |
751 | } | |
752 | ||
753 | return fls_u32(x - 1); | |
754 | } | |
feb0f3e5 | 755 | |
db5be0a3 JG |
756 | /* |
757 | * Return the minimum order for which x <= (1UL << order). | |
758 | * Return -1 if x is 0. | |
759 | */ | |
760 | LTTNG_HIDDEN | |
761 | int utils_get_count_order_u64(uint64_t x) | |
762 | { | |
763 | if (!x) { | |
764 | return -1; | |
765 | } | |
766 | ||
767 | return fls_u64(x - 1); | |
768 | } | |
769 | ||
feb0f3e5 AM |
770 | /** |
771 | * Obtain the value of LTTNG_HOME environment variable, if exists. | |
772 | * Otherwise returns the value of HOME. | |
773 | */ | |
00a52467 | 774 | LTTNG_HIDDEN |
4f00620d | 775 | const char *utils_get_home_dir(void) |
feb0f3e5 AM |
776 | { |
777 | char *val = NULL; | |
04135dbd DG |
778 | struct passwd *pwd; |
779 | ||
e8fa9fb0 | 780 | val = lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR); |
feb0f3e5 | 781 | if (val != NULL) { |
04135dbd DG |
782 | goto end; |
783 | } | |
e8fa9fb0 | 784 | val = lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); |
04135dbd DG |
785 | if (val != NULL) { |
786 | goto end; | |
feb0f3e5 | 787 | } |
04135dbd DG |
788 | |
789 | /* Fallback on the password file entry. */ | |
790 | pwd = getpwuid(getuid()); | |
791 | if (!pwd) { | |
792 | goto end; | |
793 | } | |
794 | val = pwd->pw_dir; | |
795 | ||
796 | DBG3("Home directory is '%s'", val); | |
797 | ||
798 | end: | |
799 | return val; | |
feb0f3e5 | 800 | } |
26fe5938 | 801 | |
fb198a11 JG |
802 | /** |
803 | * Get user's home directory. Dynamically allocated, must be freed | |
804 | * by the caller. | |
805 | */ | |
806 | LTTNG_HIDDEN | |
807 | char *utils_get_user_home_dir(uid_t uid) | |
808 | { | |
809 | struct passwd pwd; | |
810 | struct passwd *result; | |
811 | char *home_dir = NULL; | |
812 | char *buf = NULL; | |
813 | long buflen; | |
814 | int ret; | |
815 | ||
816 | buflen = sysconf(_SC_GETPW_R_SIZE_MAX); | |
817 | if (buflen == -1) { | |
818 | goto end; | |
819 | } | |
820 | retry: | |
821 | buf = zmalloc(buflen); | |
822 | if (!buf) { | |
823 | goto end; | |
824 | } | |
825 | ||
826 | ret = getpwuid_r(uid, &pwd, buf, buflen, &result); | |
827 | if (ret || !result) { | |
828 | if (ret == ERANGE) { | |
829 | free(buf); | |
830 | buflen *= 2; | |
831 | goto retry; | |
832 | } | |
833 | goto end; | |
834 | } | |
835 | ||
836 | home_dir = strdup(pwd.pw_dir); | |
837 | end: | |
838 | free(buf); | |
839 | return home_dir; | |
840 | } | |
841 | ||
26fe5938 DG |
842 | /* |
843 | * With the given format, fill dst with the time of len maximum siz. | |
844 | * | |
845 | * Return amount of bytes set in the buffer or else 0 on error. | |
846 | */ | |
847 | LTTNG_HIDDEN | |
848 | size_t utils_get_current_time_str(const char *format, char *dst, size_t len) | |
849 | { | |
850 | size_t ret; | |
851 | time_t rawtime; | |
852 | struct tm *timeinfo; | |
853 | ||
854 | assert(format); | |
855 | assert(dst); | |
856 | ||
857 | /* Get date and time for session path */ | |
858 | time(&rawtime); | |
859 | timeinfo = localtime(&rawtime); | |
860 | ret = strftime(dst, len, format, timeinfo); | |
861 | if (ret == 0) { | |
68e6efdd | 862 | ERR("Unable to strftime with format %s at dst %p of len %zu", format, |
26fe5938 DG |
863 | dst, len); |
864 | } | |
865 | ||
866 | return ret; | |
867 | } | |
6c71277b MD |
868 | |
869 | /* | |
28ab59d0 JR |
870 | * Return 0 on success and set *gid to the group_ID matching the passed name. |
871 | * Else -1 if it cannot be found or an error occurred. | |
6c71277b MD |
872 | */ |
873 | LTTNG_HIDDEN | |
28ab59d0 | 874 | int utils_get_group_id(const char *name, bool warn, gid_t *gid) |
6c71277b | 875 | { |
28ab59d0 JR |
876 | static volatile int warn_once; |
877 | int ret; | |
878 | long sys_len; | |
879 | size_t len; | |
880 | struct group grp; | |
881 | struct group *result; | |
882 | struct lttng_dynamic_buffer buffer; | |
883 | ||
884 | /* Get the system limit, if it exists. */ | |
885 | sys_len = sysconf(_SC_GETGR_R_SIZE_MAX); | |
886 | if (sys_len == -1) { | |
887 | len = 1024; | |
888 | } else { | |
889 | len = (size_t) sys_len; | |
890 | } | |
891 | ||
892 | lttng_dynamic_buffer_init(&buffer); | |
893 | ret = lttng_dynamic_buffer_set_size(&buffer, len); | |
894 | if (ret) { | |
895 | ERR("Failed to allocate group info buffer"); | |
896 | ret = -1; | |
897 | goto error; | |
898 | } | |
6c71277b | 899 | |
28ab59d0 JR |
900 | while ((ret = getgrnam_r(name, &grp, buffer.data, buffer.size, &result)) == ERANGE) { |
901 | const size_t new_len = 2 * buffer.size; | |
6c71277b | 902 | |
28ab59d0 JR |
903 | /* Buffer is not big enough, increase its size. */ |
904 | if (new_len < buffer.size) { | |
905 | ERR("Group info buffer size overflow"); | |
906 | ret = -1; | |
907 | goto error; | |
908 | } | |
909 | ||
910 | ret = lttng_dynamic_buffer_set_size(&buffer, new_len); | |
911 | if (ret) { | |
912 | ERR("Failed to grow group info buffer to %zu bytes", | |
913 | new_len); | |
914 | ret = -1; | |
915 | goto error; | |
6c71277b | 916 | } |
6c71277b | 917 | } |
28ab59d0 | 918 | if (ret) { |
9120e619 JG |
919 | if (ret == ESRCH) { |
920 | DBG("Could not find group file entry for group name '%s'", | |
921 | name); | |
922 | } else { | |
923 | PERROR("Failed to get group file entry for group name '%s'", | |
924 | name); | |
925 | } | |
926 | ||
28ab59d0 JR |
927 | ret = -1; |
928 | goto error; | |
929 | } | |
930 | ||
931 | /* Group not found. */ | |
932 | if (!result) { | |
933 | ret = -1; | |
934 | goto error; | |
935 | } | |
936 | ||
937 | *gid = result->gr_gid; | |
938 | ret = 0; | |
939 | ||
940 | error: | |
941 | if (ret && warn && !warn_once) { | |
942 | WARN("No tracing group detected"); | |
943 | warn_once = 1; | |
944 | } | |
945 | lttng_dynamic_buffer_reset(&buffer); | |
946 | return ret; | |
6c71277b | 947 | } |
8db0dc00 JG |
948 | |
949 | /* | |
950 | * Return a newly allocated option string. This string is to be used as the | |
951 | * optstring argument of getopt_long(), see GETOPT(3). opt_count is the number | |
952 | * of elements in the long_options array. Returns NULL if the string's | |
953 | * allocation fails. | |
954 | */ | |
955 | LTTNG_HIDDEN | |
956 | char *utils_generate_optstring(const struct option *long_options, | |
957 | size_t opt_count) | |
958 | { | |
959 | int i; | |
960 | size_t string_len = opt_count, str_pos = 0; | |
961 | char *optstring; | |
962 | ||
963 | /* | |
964 | * Compute the necessary string length. One letter per option, two when an | |
965 | * argument is necessary, and a trailing NULL. | |
966 | */ | |
967 | for (i = 0; i < opt_count; i++) { | |
968 | string_len += long_options[i].has_arg ? 1 : 0; | |
969 | } | |
970 | ||
971 | optstring = zmalloc(string_len); | |
972 | if (!optstring) { | |
973 | goto end; | |
974 | } | |
975 | ||
976 | for (i = 0; i < opt_count; i++) { | |
977 | if (!long_options[i].name) { | |
978 | /* Got to the trailing NULL element */ | |
979 | break; | |
980 | } | |
981 | ||
a596dcb9 JG |
982 | if (long_options[i].val != '\0') { |
983 | optstring[str_pos++] = (char) long_options[i].val; | |
984 | if (long_options[i].has_arg) { | |
985 | optstring[str_pos++] = ':'; | |
986 | } | |
8db0dc00 JG |
987 | } |
988 | } | |
989 | ||
990 | end: | |
991 | return optstring; | |
992 | } | |
3d071855 MD |
993 | |
994 | /* | |
995 | * Try to remove a hierarchy of empty directories, recursively. Don't unlink | |
9529ec1b | 996 | * any file. Try to rmdir any empty directory within the hierarchy. |
3d071855 MD |
997 | */ |
998 | LTTNG_HIDDEN | |
999 | int utils_recursive_rmdir(const char *path) | |
1000 | { | |
93bed9fe | 1001 | int ret; |
cbf53d23 | 1002 | struct lttng_directory_handle *handle; |
7a946beb | 1003 | |
cbf53d23 JG |
1004 | handle = lttng_directory_handle_create(NULL); |
1005 | if (!handle) { | |
1006 | ret = -1; | |
93bed9fe | 1007 | goto end; |
3d071855 | 1008 | } |
cbf53d23 | 1009 | ret = lttng_directory_handle_remove_subdirectory(handle, path); |
3d071855 | 1010 | end: |
cbf53d23 | 1011 | lttng_directory_handle_put(handle); |
3d071855 MD |
1012 | return ret; |
1013 | } | |
93ec662e JD |
1014 | |
1015 | LTTNG_HIDDEN | |
1016 | int utils_truncate_stream_file(int fd, off_t length) | |
1017 | { | |
1018 | int ret; | |
a5df8828 | 1019 | off_t lseek_ret; |
93ec662e JD |
1020 | |
1021 | ret = ftruncate(fd, length); | |
1022 | if (ret < 0) { | |
1023 | PERROR("ftruncate"); | |
1024 | goto end; | |
1025 | } | |
a5df8828 GL |
1026 | lseek_ret = lseek(fd, length, SEEK_SET); |
1027 | if (lseek_ret < 0) { | |
93ec662e | 1028 | PERROR("lseek"); |
a5df8828 | 1029 | ret = -1; |
93ec662e JD |
1030 | goto end; |
1031 | } | |
93ec662e JD |
1032 | end: |
1033 | return ret; | |
1034 | } | |
4ba92f18 PP |
1035 | |
1036 | static const char *get_man_bin_path(void) | |
1037 | { | |
b7dce40d | 1038 | char *env_man_path = lttng_secure_getenv(DEFAULT_MAN_BIN_PATH_ENV); |
4ba92f18 PP |
1039 | |
1040 | if (env_man_path) { | |
1041 | return env_man_path; | |
1042 | } | |
1043 | ||
1044 | return DEFAULT_MAN_BIN_PATH; | |
1045 | } | |
1046 | ||
1047 | LTTNG_HIDDEN | |
4fc83d94 PP |
1048 | int utils_show_help(int section, const char *page_name, |
1049 | const char *help_msg) | |
4ba92f18 PP |
1050 | { |
1051 | char section_string[8]; | |
1052 | const char *man_bin_path = get_man_bin_path(); | |
4fc83d94 PP |
1053 | int ret = 0; |
1054 | ||
1055 | if (help_msg) { | |
1056 | printf("%s", help_msg); | |
1057 | goto end; | |
1058 | } | |
4ba92f18 PP |
1059 | |
1060 | /* Section integer -> section string */ | |
1061 | ret = sprintf(section_string, "%d", section); | |
1062 | assert(ret > 0 && ret < 8); | |
1063 | ||
1064 | /* | |
1065 | * Execute man pager. | |
1066 | * | |
b07e7ef0 | 1067 | * We provide -M to man here because LTTng-tools can |
4ba92f18 PP |
1068 | * be installed outside /usr, in which case its man pages are |
1069 | * not located in the default /usr/share/man directory. | |
1070 | */ | |
b07e7ef0 | 1071 | ret = execlp(man_bin_path, "man", "-M", MANPATH, |
4ba92f18 | 1072 | section_string, page_name, NULL); |
4fc83d94 PP |
1073 | |
1074 | end: | |
4ba92f18 PP |
1075 | return ret; |
1076 | } | |
09b72f7a FD |
1077 | |
1078 | static | |
d72eb77f | 1079 | int read_proc_meminfo_field(const char *field, uint64_t *value) |
09b72f7a FD |
1080 | { |
1081 | int ret; | |
1082 | FILE *proc_meminfo; | |
1083 | char name[PROC_MEMINFO_FIELD_MAX_NAME_LEN] = {}; | |
1084 | ||
1085 | proc_meminfo = fopen(PROC_MEMINFO_PATH, "r"); | |
1086 | if (!proc_meminfo) { | |
1087 | PERROR("Failed to fopen() " PROC_MEMINFO_PATH); | |
1088 | ret = -1; | |
1089 | goto fopen_error; | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * Read the contents of /proc/meminfo line by line to find the right | |
1094 | * field. | |
1095 | */ | |
1096 | while (!feof(proc_meminfo)) { | |
d72eb77f | 1097 | uint64_t value_kb; |
09b72f7a FD |
1098 | |
1099 | ret = fscanf(proc_meminfo, | |
d72eb77f | 1100 | "%" MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "s %" SCNu64 " kB\n", |
09b72f7a FD |
1101 | name, &value_kb); |
1102 | if (ret == EOF) { | |
1103 | /* | |
1104 | * fscanf() returning EOF can indicate EOF or an error. | |
1105 | */ | |
1106 | if (ferror(proc_meminfo)) { | |
1107 | PERROR("Failed to parse " PROC_MEMINFO_PATH); | |
1108 | } | |
1109 | break; | |
1110 | } | |
1111 | ||
1112 | if (ret == 2 && strcmp(name, field) == 0) { | |
1113 | /* | |
1114 | * This number is displayed in kilo-bytes. Return the | |
1115 | * number of bytes. | |
1116 | */ | |
d72eb77f JR |
1117 | if (value_kb > UINT64_MAX / 1024) { |
1118 | ERR("Overflow on kb to bytes conversion"); | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | *value = value_kb * 1024; | |
09b72f7a FD |
1123 | ret = 0; |
1124 | goto found; | |
1125 | } | |
1126 | } | |
1127 | /* Reached the end of the file without finding the right field. */ | |
1128 | ret = -1; | |
1129 | ||
1130 | found: | |
1131 | fclose(proc_meminfo); | |
1132 | fopen_error: | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Returns an estimate of the number of bytes of memory available based on the | |
1138 | * the information in `/proc/meminfo`. The number returned by this function is | |
1139 | * a best guess. | |
1140 | */ | |
1141 | LTTNG_HIDDEN | |
d72eb77f | 1142 | int utils_get_memory_available(uint64_t *value) |
09b72f7a FD |
1143 | { |
1144 | return read_proc_meminfo_field(PROC_MEMINFO_MEMAVAILABLE_LINE, value); | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Returns the total size of the memory on the system in bytes based on the | |
1149 | * the information in `/proc/meminfo`. | |
1150 | */ | |
1151 | LTTNG_HIDDEN | |
d72eb77f | 1152 | int utils_get_memory_total(uint64_t *value) |
09b72f7a FD |
1153 | { |
1154 | return read_proc_meminfo_field(PROC_MEMINFO_MEMTOTAL_LINE, value); | |
1155 | } | |
ce9ee1fb JR |
1156 | |
1157 | LTTNG_HIDDEN | |
1158 | int utils_change_working_directory(const char *path) | |
1159 | { | |
1160 | int ret; | |
1161 | ||
1162 | assert(path); | |
1163 | ||
1164 | DBG("Changing working directory to \"%s\"", path); | |
1165 | ret = chdir(path); | |
1166 | if (ret) { | |
1167 | PERROR("Failed to change working directory to \"%s\"", path); | |
1168 | goto end; | |
1169 | } | |
1170 | ||
1171 | /* Check for write access */ | |
1172 | if (access(path, W_OK)) { | |
1173 | if (errno == EACCES) { | |
1174 | /* | |
1175 | * Do not treat this as an error since the permission | |
1176 | * might change in the lifetime of the process | |
1177 | */ | |
1178 | DBG("Working directory \"%s\" is not writable", path); | |
1179 | } else { | |
1180 | PERROR("Failed to check if working directory \"%s\" is writable", | |
1181 | path); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | end: | |
1186 | return ret; | |
1187 | } | |
159b042f JG |
1188 | |
1189 | LTTNG_HIDDEN | |
1190 | enum lttng_error_code utils_user_id_from_name(const char *user_name, uid_t *uid) | |
1191 | { | |
1192 | struct passwd p, *pres; | |
1193 | int ret; | |
1194 | enum lttng_error_code ret_val = LTTNG_OK; | |
1195 | char *buf = NULL; | |
1196 | ssize_t buflen; | |
1197 | ||
1198 | buflen = sysconf(_SC_GETPW_R_SIZE_MAX); | |
1199 | if (buflen < 0) { | |
1200 | buflen = FALLBACK_USER_BUFLEN; | |
1201 | } | |
1202 | ||
1203 | buf = zmalloc(buflen); | |
1204 | if (!buf) { | |
1205 | ret_val = LTTNG_ERR_NOMEM; | |
1206 | goto end; | |
1207 | } | |
1208 | ||
1209 | for (;;) { | |
1210 | ret = getpwnam_r(user_name, &p, buf, buflen, &pres); | |
1211 | switch (ret) { | |
1212 | case EINTR: | |
1213 | continue; | |
1214 | case ERANGE: | |
1215 | buflen *= 2; | |
1216 | free(buf); | |
1217 | buf = zmalloc(buflen); | |
1218 | if (!buf) { | |
1219 | ret_val = LTTNG_ERR_NOMEM; | |
1220 | goto end; | |
1221 | } | |
1222 | continue; | |
1223 | default: | |
1224 | goto end_loop; | |
1225 | } | |
1226 | } | |
1227 | end_loop: | |
1228 | ||
1229 | switch (ret) { | |
1230 | case 0: | |
1231 | if (pres == NULL) { | |
1232 | ret_val = LTTNG_ERR_USER_NOT_FOUND; | |
1233 | } else { | |
1234 | *uid = p.pw_uid; | |
1235 | DBG("Lookup of tracker UID/VUID: name '%s' maps to uid %" PRId64, | |
1236 | user_name, (int64_t) *uid); | |
1237 | ret_val = LTTNG_OK; | |
1238 | } | |
1239 | break; | |
1240 | case ENOENT: | |
1241 | case ESRCH: | |
1242 | case EBADF: | |
1243 | case EPERM: | |
1244 | ret_val = LTTNG_ERR_USER_NOT_FOUND; | |
1245 | break; | |
1246 | default: | |
1247 | ret_val = LTTNG_ERR_NOMEM; | |
1248 | } | |
1249 | end: | |
1250 | free(buf); | |
1251 | return ret_val; | |
1252 | } | |
1253 | ||
1254 | LTTNG_HIDDEN | |
1255 | enum lttng_error_code utils_group_id_from_name( | |
1256 | const char *group_name, gid_t *gid) | |
1257 | { | |
1258 | struct group g, *gres; | |
1259 | int ret; | |
1260 | enum lttng_error_code ret_val = LTTNG_OK; | |
1261 | char *buf = NULL; | |
1262 | ssize_t buflen; | |
1263 | ||
1264 | buflen = sysconf(_SC_GETGR_R_SIZE_MAX); | |
1265 | if (buflen < 0) { | |
1266 | buflen = FALLBACK_GROUP_BUFLEN; | |
1267 | } | |
1268 | ||
1269 | buf = zmalloc(buflen); | |
1270 | if (!buf) { | |
1271 | ret_val = LTTNG_ERR_NOMEM; | |
1272 | goto end; | |
1273 | } | |
1274 | ||
1275 | for (;;) { | |
1276 | ret = getgrnam_r(group_name, &g, buf, buflen, &gres); | |
1277 | switch (ret) { | |
1278 | case EINTR: | |
1279 | continue; | |
1280 | case ERANGE: | |
1281 | buflen *= 2; | |
1282 | free(buf); | |
1283 | buf = zmalloc(buflen); | |
1284 | if (!buf) { | |
1285 | ret_val = LTTNG_ERR_NOMEM; | |
1286 | goto end; | |
1287 | } | |
1288 | continue; | |
1289 | default: | |
1290 | goto end_loop; | |
1291 | } | |
1292 | } | |
1293 | end_loop: | |
1294 | ||
1295 | switch (ret) { | |
1296 | case 0: | |
1297 | if (gres == NULL) { | |
1298 | ret_val = LTTNG_ERR_GROUP_NOT_FOUND; | |
1299 | } else { | |
1300 | *gid = g.gr_gid; | |
1301 | DBG("Lookup of tracker GID/GUID: name '%s' maps to gid %" PRId64, | |
1302 | group_name, (int64_t) *gid); | |
1303 | ret_val = LTTNG_OK; | |
1304 | } | |
1305 | break; | |
1306 | case ENOENT: | |
1307 | case ESRCH: | |
1308 | case EBADF: | |
1309 | case EPERM: | |
1310 | ret_val = LTTNG_ERR_GROUP_NOT_FOUND; | |
1311 | break; | |
1312 | default: | |
1313 | ret_val = LTTNG_ERR_NOMEM; | |
1314 | } | |
1315 | end: | |
1316 | free(buf); | |
1317 | return ret_val; | |
1318 | } | |
240baf2b JR |
1319 | |
1320 | LTTNG_HIDDEN | |
1321 | int utils_parse_unsigned_long_long(const char *str, | |
1322 | unsigned long long *value) | |
1323 | { | |
1324 | int ret; | |
1325 | char *endptr; | |
1326 | ||
1327 | assert(str); | |
1328 | assert(value); | |
1329 | ||
1330 | errno = 0; | |
1331 | *value = strtoull(str, &endptr, 10); | |
1332 | ||
1333 | /* Conversion failed. Out of range? */ | |
1334 | if (errno != 0) { | |
1335 | /* Don't print an error; allow the caller to log a better error. */ | |
1336 | DBG("Failed to parse string as unsigned long long number: string = '%s', errno = %d", | |
1337 | str, errno); | |
1338 | ret = -1; | |
1339 | goto end; | |
1340 | } | |
1341 | ||
1342 | /* Not the end of the string or empty string. */ | |
1343 | if (*endptr || endptr == str) { | |
1344 | DBG("Failed to parse string as unsigned long long number: string = '%s'", | |
1345 | str); | |
1346 | ret = -1; | |
1347 | goto end; | |
1348 | } | |
1349 | ||
1350 | ret = 0; | |
1351 | ||
1352 | end: | |
1353 | return ret; | |
1354 | } |