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 | * |
c922647d | 5 | * SPDX-License-Identifier: LGPL-2.1-only |
81b86775 | 6 | * |
81b86775 DG |
7 | */ |
8 | ||
159b042f | 9 | #include "common/macros.h" |
13dd7782 | 10 | #include <stdint.h> |
6c1c0768 | 11 | #define _LGPL_SOURCE |
81b86775 DG |
12 | #include <ctype.h> |
13 | #include <fcntl.h> | |
14 | #include <limits.h> | |
15 | #include <stdlib.h> | |
2d851108 | 16 | #include <sys/stat.h> |
0c7bcad5 | 17 | #include <sys/types.h> |
2d851108 | 18 | #include <unistd.h> |
fe4477ee | 19 | #include <inttypes.h> |
6c71277b | 20 | #include <grp.h> |
fb198a11 | 21 | #include <pwd.h> |
c9cb3e7d | 22 | #include <sys/file.h> |
a98e236e | 23 | #include <unistd.h> |
81b86775 DG |
24 | |
25 | #include <common/common.h> | |
09b72f7a | 26 | #include <common/readwrite.h> |
fe4477ee | 27 | #include <common/runas.h> |
e8fa9fb0 | 28 | #include <common/compat/getenv.h> |
f5436bfc | 29 | #include <common/compat/string.h> |
5a2451c9 | 30 | #include <common/compat/dirent.h> |
18710679 | 31 | #include <common/compat/directory-handle.h> |
28ab59d0 | 32 | #include <common/dynamic-buffer.h> |
40804255 | 33 | #include <common/string-utils/format.h> |
d7c23421 | 34 | #include <lttng/constant.h> |
81b86775 DG |
35 | |
36 | #include "utils.h" | |
feb0f3e5 | 37 | #include "defaults.h" |
2daf6502 | 38 | #include "time.h" |
81b86775 | 39 | |
09b72f7a FD |
40 | #define PROC_MEMINFO_PATH "/proc/meminfo" |
41 | #define PROC_MEMINFO_MEMAVAILABLE_LINE "MemAvailable:" | |
42 | #define PROC_MEMINFO_MEMTOTAL_LINE "MemTotal:" | |
43 | ||
44 | /* The length of the longest field of `/proc/meminfo`. */ | |
45 | #define PROC_MEMINFO_FIELD_MAX_NAME_LEN 20 | |
46 | ||
47 | #if (PROC_MEMINFO_FIELD_MAX_NAME_LEN == 20) | |
48 | #define MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "19" | |
49 | #else | |
50 | #error MAX_NAME_LEN_SCANF_IS_A_BROKEN_API must be updated to match (PROC_MEMINFO_FIELD_MAX_NAME_LEN - 1) | |
51 | #endif | |
52 | ||
159b042f JG |
53 | #define FALLBACK_USER_BUFLEN 16384 |
54 | #define FALLBACK_GROUP_BUFLEN 16384 | |
55 | ||
81b86775 DG |
56 | /* |
57 | * Create a pipe in dst. | |
58 | */ | |
59 | int utils_create_pipe(int *dst) | |
60 | { | |
61 | int ret; | |
62 | ||
63 | if (dst == NULL) { | |
64 | return -1; | |
65 | } | |
66 | ||
67 | ret = pipe(dst); | |
68 | if (ret < 0) { | |
69 | PERROR("create pipe"); | |
70 | } | |
71 | ||
72 | return ret; | |
73 | } | |
74 | ||
75 | /* | |
76 | * Create pipe and set CLOEXEC flag to both fd. | |
77 | * | |
78 | * Make sure the pipe opened by this function are closed at some point. Use | |
79 | * utils_close_pipe(). | |
80 | */ | |
81 | int utils_create_pipe_cloexec(int *dst) | |
82 | { | |
83 | int ret, i; | |
84 | ||
85 | if (dst == NULL) { | |
86 | return -1; | |
87 | } | |
88 | ||
89 | ret = utils_create_pipe(dst); | |
90 | if (ret < 0) { | |
91 | goto error; | |
92 | } | |
93 | ||
94 | for (i = 0; i < 2; i++) { | |
95 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
96 | if (ret < 0) { | |
97 | PERROR("fcntl pipe cloexec"); | |
98 | goto error; | |
99 | } | |
100 | } | |
101 | ||
102 | error: | |
103 | return ret; | |
104 | } | |
105 | ||
094f381c MD |
106 | /* |
107 | * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK. | |
108 | * | |
109 | * Make sure the pipe opened by this function are closed at some point. Use | |
110 | * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to | |
111 | * support OSes other than Linux 2.6.23+. | |
112 | */ | |
094f381c MD |
113 | int utils_create_pipe_cloexec_nonblock(int *dst) |
114 | { | |
115 | int ret, i; | |
116 | ||
117 | if (dst == NULL) { | |
118 | return -1; | |
119 | } | |
120 | ||
121 | ret = utils_create_pipe(dst); | |
122 | if (ret < 0) { | |
123 | goto error; | |
124 | } | |
125 | ||
126 | for (i = 0; i < 2; i++) { | |
127 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
128 | if (ret < 0) { | |
129 | PERROR("fcntl pipe cloexec"); | |
130 | goto error; | |
131 | } | |
132 | /* | |
133 | * Note: we override any flag that could have been | |
134 | * previously set on the fd. | |
135 | */ | |
136 | ret = fcntl(dst[i], F_SETFL, O_NONBLOCK); | |
137 | if (ret < 0) { | |
138 | PERROR("fcntl pipe nonblock"); | |
139 | goto error; | |
140 | } | |
141 | } | |
142 | ||
143 | error: | |
144 | return ret; | |
145 | } | |
146 | ||
81b86775 DG |
147 | /* |
148 | * Close both read and write side of the pipe. | |
149 | */ | |
150 | void utils_close_pipe(int *src) | |
151 | { | |
152 | int i, ret; | |
153 | ||
154 | if (src == NULL) { | |
155 | return; | |
156 | } | |
157 | ||
158 | for (i = 0; i < 2; i++) { | |
159 | /* Safety check */ | |
160 | if (src[i] < 0) { | |
161 | continue; | |
162 | } | |
163 | ||
164 | ret = close(src[i]); | |
165 | if (ret) { | |
166 | PERROR("close pipe"); | |
167 | } | |
11f8d2f7 | 168 | src[i] = -1; |
81b86775 DG |
169 | } |
170 | } | |
a4b92340 DG |
171 | |
172 | /* | |
173 | * Create a new string using two strings range. | |
174 | */ | |
175 | char *utils_strdupdelim(const char *begin, const char *end) | |
176 | { | |
177 | char *str; | |
178 | ||
a6bc4ca9 | 179 | str = (char *) zmalloc(end - begin + 1); |
a4b92340 DG |
180 | if (str == NULL) { |
181 | PERROR("zmalloc strdupdelim"); | |
182 | goto error; | |
183 | } | |
184 | ||
185 | memcpy(str, begin, end - begin); | |
186 | str[end - begin] = '\0'; | |
187 | ||
188 | error: | |
189 | return str; | |
190 | } | |
b662582b DG |
191 | |
192 | /* | |
193 | * Set CLOEXEC flag to the give file descriptor. | |
194 | */ | |
b662582b DG |
195 | int utils_set_fd_cloexec(int fd) |
196 | { | |
197 | int ret; | |
198 | ||
199 | if (fd < 0) { | |
200 | ret = -EINVAL; | |
201 | goto end; | |
202 | } | |
203 | ||
204 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); | |
205 | if (ret < 0) { | |
206 | PERROR("fcntl cloexec"); | |
207 | ret = -errno; | |
208 | } | |
209 | ||
210 | end: | |
211 | return ret; | |
212 | } | |
35f90c40 DG |
213 | |
214 | /* | |
215 | * Create pid file to the given path and filename. | |
216 | */ | |
35f90c40 DG |
217 | int utils_create_pid_file(pid_t pid, const char *filepath) |
218 | { | |
219 | int ret; | |
220 | FILE *fp; | |
221 | ||
a0377dfe | 222 | LTTNG_ASSERT(filepath); |
35f90c40 DG |
223 | |
224 | fp = fopen(filepath, "w"); | |
225 | if (fp == NULL) { | |
226 | PERROR("open pid file %s", filepath); | |
227 | ret = -1; | |
228 | goto error; | |
229 | } | |
230 | ||
d1f721c5 | 231 | ret = fprintf(fp, "%d\n", (int) pid); |
35f90c40 DG |
232 | if (ret < 0) { |
233 | PERROR("fprintf pid file"); | |
e205d79b | 234 | goto error; |
35f90c40 DG |
235 | } |
236 | ||
e205d79b MD |
237 | if (fclose(fp)) { |
238 | PERROR("fclose"); | |
239 | } | |
d1f721c5 | 240 | DBG("Pid %d written in file %s", (int) pid, filepath); |
e205d79b | 241 | ret = 0; |
35f90c40 DG |
242 | error: |
243 | return ret; | |
244 | } | |
2d851108 | 245 | |
c9cb3e7d JG |
246 | /* |
247 | * Create lock file to the given path and filename. | |
248 | * Returns the associated file descriptor, -1 on error. | |
249 | */ | |
c9cb3e7d JG |
250 | int utils_create_lock_file(const char *filepath) |
251 | { | |
252 | int ret; | |
253 | int fd; | |
77e7fddf | 254 | struct flock lock; |
c9cb3e7d | 255 | |
a0377dfe | 256 | LTTNG_ASSERT(filepath); |
c9cb3e7d | 257 | |
77e7fddf MJ |
258 | memset(&lock, 0, sizeof(lock)); |
259 | fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | | |
260 | S_IRGRP | S_IWGRP); | |
c9cb3e7d JG |
261 | if (fd < 0) { |
262 | PERROR("open lock file %s", filepath); | |
e6576ba2 | 263 | fd = -1; |
c9cb3e7d JG |
264 | goto error; |
265 | } | |
266 | ||
267 | /* | |
268 | * Attempt to lock the file. If this fails, there is | |
269 | * already a process using the same lock file running | |
270 | * and we should exit. | |
271 | */ | |
77e7fddf MJ |
272 | lock.l_whence = SEEK_SET; |
273 | lock.l_type = F_WRLCK; | |
274 | ||
275 | ret = fcntl(fd, F_SETLK, &lock); | |
276 | if (ret == -1) { | |
277 | PERROR("fcntl lock file"); | |
208ff148 | 278 | ERR("Could not get lock file %s, another instance is running.", |
c9cb3e7d | 279 | filepath); |
ffb0b851 JG |
280 | if (close(fd)) { |
281 | PERROR("close lock file"); | |
282 | } | |
c9cb3e7d JG |
283 | fd = ret; |
284 | goto error; | |
285 | } | |
286 | ||
287 | error: | |
288 | return fd; | |
289 | } | |
290 | ||
2d851108 | 291 | /* |
d77dded2 | 292 | * Create directory using the given path and mode. |
2d851108 DG |
293 | * |
294 | * On success, return 0 else a negative error code. | |
295 | */ | |
d77dded2 JG |
296 | int utils_mkdir(const char *path, mode_t mode, int uid, int gid) |
297 | { | |
298 | int ret; | |
cbf53d23 | 299 | struct lttng_directory_handle *handle; |
69e3a560 | 300 | const struct lttng_credentials creds = { |
a6bc4ca9 SM |
301 | .uid = LTTNG_OPTIONAL_INIT_VALUE((uid_t) uid), |
302 | .gid = LTTNG_OPTIONAL_INIT_VALUE((gid_t) gid), | |
18710679 JG |
303 | }; |
304 | ||
cbf53d23 JG |
305 | handle = lttng_directory_handle_create(NULL); |
306 | if (!handle) { | |
307 | ret = -1; | |
fd774fc6 JG |
308 | goto end; |
309 | } | |
18710679 | 310 | ret = lttng_directory_handle_create_subdirectory_as_user( |
cbf53d23 | 311 | handle, path, mode, |
18710679 | 312 | (uid >= 0 || gid >= 0) ? &creds : NULL); |
fd774fc6 | 313 | end: |
cbf53d23 | 314 | lttng_directory_handle_put(handle); |
2d851108 DG |
315 | return ret; |
316 | } | |
fe4477ee | 317 | |
d77dded2 JG |
318 | /* |
319 | * Recursively create directory using the given path and mode, under the | |
320 | * provided uid and gid. | |
321 | * | |
322 | * On success, return 0 else a negative error code. | |
323 | */ | |
d77dded2 JG |
324 | int utils_mkdir_recursive(const char *path, mode_t mode, int uid, int gid) |
325 | { | |
326 | int ret; | |
cbf53d23 | 327 | struct lttng_directory_handle *handle; |
69e3a560 | 328 | const struct lttng_credentials creds = { |
a6bc4ca9 SM |
329 | .uid = LTTNG_OPTIONAL_INIT_VALUE((uid_t) uid), |
330 | .gid = LTTNG_OPTIONAL_INIT_VALUE((gid_t) gid), | |
18710679 JG |
331 | }; |
332 | ||
cbf53d23 JG |
333 | handle = lttng_directory_handle_create(NULL); |
334 | if (!handle) { | |
335 | ret = -1; | |
fd774fc6 JG |
336 | goto end; |
337 | } | |
18710679 | 338 | ret = lttng_directory_handle_create_subdirectory_recursive_as_user( |
cbf53d23 | 339 | handle, path, mode, |
18710679 | 340 | (uid >= 0 || gid >= 0) ? &creds : NULL); |
fd774fc6 | 341 | end: |
cbf53d23 | 342 | lttng_directory_handle_put(handle); |
d77dded2 JG |
343 | return ret; |
344 | } | |
345 | ||
fe4477ee | 346 | /* |
40804255 | 347 | * out_stream_path is the output parameter. |
fe4477ee JD |
348 | * |
349 | * Return 0 on success or else a negative value. | |
350 | */ | |
40804255 JG |
351 | int utils_stream_file_path(const char *path_name, const char *file_name, |
352 | uint64_t size, uint64_t count, const char *suffix, | |
353 | char *out_stream_path, size_t stream_path_len) | |
fe4477ee | 354 | { |
7591bab1 | 355 | int ret; |
d6d89e4c | 356 | char count_str[MAX_INT_DEC_LEN(count) + 1] = {}; |
40804255 | 357 | const char *path_separator; |
fe4477ee | 358 | |
d248f3c2 MD |
359 | if (path_name && (path_name[0] == '\0' || |
360 | path_name[strlen(path_name) - 1] == '/')) { | |
40804255 JG |
361 | path_separator = ""; |
362 | } else { | |
363 | path_separator = "/"; | |
fe4477ee JD |
364 | } |
365 | ||
40804255 JG |
366 | path_name = path_name ? : ""; |
367 | suffix = suffix ? : ""; | |
368 | if (size > 0) { | |
369 | ret = snprintf(count_str, sizeof(count_str), "_%" PRIu64, | |
370 | count); | |
a0377dfe | 371 | LTTNG_ASSERT(ret > 0 && ret < sizeof(count_str)); |
309167d2 JD |
372 | } |
373 | ||
d6d89e4c | 374 | ret = snprintf(out_stream_path, stream_path_len, "%s%s%s%s%s", |
40804255 JG |
375 | path_name, path_separator, file_name, count_str, |
376 | suffix); | |
377 | if (ret < 0 || ret >= stream_path_len) { | |
378 | ERR("Truncation occurred while formatting stream path"); | |
379 | ret = -1; | |
fe4477ee | 380 | } else { |
40804255 | 381 | ret = 0; |
7591bab1 | 382 | } |
7591bab1 MD |
383 | return ret; |
384 | } | |
385 | ||
70d0b120 SM |
386 | /** |
387 | * Parse a string that represents a size in human readable format. It | |
5983a922 | 388 | * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'. |
70d0b120 SM |
389 | * |
390 | * The suffix multiply the integer by: | |
391 | * 'k': 1024 | |
392 | * 'M': 1024^2 | |
393 | * 'G': 1024^3 | |
394 | * | |
395 | * @param str The string to parse. | |
5983a922 | 396 | * @param size Pointer to a uint64_t that will be filled with the |
cfa9a5a2 | 397 | * resulting size. |
70d0b120 SM |
398 | * |
399 | * @return 0 on success, -1 on failure. | |
400 | */ | |
5983a922 | 401 | int utils_parse_size_suffix(const char * const str, uint64_t * const size) |
70d0b120 | 402 | { |
70d0b120 | 403 | int ret; |
5983a922 | 404 | uint64_t base_size; |
70d0b120 | 405 | long shift = 0; |
5983a922 SM |
406 | const char *str_end; |
407 | char *num_end; | |
70d0b120 SM |
408 | |
409 | if (!str) { | |
5983a922 | 410 | DBG("utils_parse_size_suffix: received a NULL string."); |
70d0b120 SM |
411 | ret = -1; |
412 | goto end; | |
413 | } | |
414 | ||
5983a922 SM |
415 | /* strtoull will accept a negative number, but we don't want to. */ |
416 | if (strchr(str, '-') != NULL) { | |
417 | DBG("utils_parse_size_suffix: invalid size string, should not contain '-'."); | |
70d0b120 | 418 | ret = -1; |
5983a922 | 419 | goto end; |
70d0b120 SM |
420 | } |
421 | ||
5983a922 SM |
422 | /* str_end will point to the \0 */ |
423 | str_end = str + strlen(str); | |
70d0b120 | 424 | errno = 0; |
5983a922 | 425 | base_size = strtoull(str, &num_end, 0); |
70d0b120 | 426 | if (errno != 0) { |
5983a922 | 427 | PERROR("utils_parse_size_suffix strtoull"); |
70d0b120 | 428 | ret = -1; |
5983a922 SM |
429 | goto end; |
430 | } | |
431 | ||
432 | if (num_end == str) { | |
433 | /* strtoull parsed nothing, not good. */ | |
434 | DBG("utils_parse_size_suffix: strtoull had nothing good to parse."); | |
435 | ret = -1; | |
436 | goto end; | |
437 | } | |
438 | ||
439 | /* Check if a prefix is present. */ | |
440 | switch (*num_end) { | |
441 | case 'G': | |
442 | shift = GIBI_LOG2; | |
443 | num_end++; | |
444 | break; | |
445 | case 'M': /* */ | |
446 | shift = MEBI_LOG2; | |
447 | num_end++; | |
448 | break; | |
449 | case 'K': | |
450 | case 'k': | |
451 | shift = KIBI_LOG2; | |
452 | num_end++; | |
453 | break; | |
454 | case '\0': | |
455 | break; | |
456 | default: | |
457 | DBG("utils_parse_size_suffix: invalid suffix."); | |
458 | ret = -1; | |
459 | goto end; | |
460 | } | |
461 | ||
462 | /* Check for garbage after the valid input. */ | |
463 | if (num_end != str_end) { | |
464 | DBG("utils_parse_size_suffix: Garbage after size string."); | |
465 | ret = -1; | |
466 | goto end; | |
70d0b120 SM |
467 | } |
468 | ||
469 | *size = base_size << shift; | |
470 | ||
471 | /* Check for overflow */ | |
472 | if ((*size >> shift) != base_size) { | |
5983a922 | 473 | DBG("utils_parse_size_suffix: oops, overflow detected."); |
70d0b120 | 474 | ret = -1; |
5983a922 | 475 | goto end; |
70d0b120 SM |
476 | } |
477 | ||
478 | ret = 0; | |
70d0b120 SM |
479 | end: |
480 | return ret; | |
481 | } | |
cfa9a5a2 | 482 | |
7010c033 SM |
483 | /** |
484 | * Parse a string that represents a time in human readable format. It | |
81684730 JR |
485 | * supports decimal integers suffixed by: |
486 | * "us" for microsecond, | |
487 | * "ms" for millisecond, | |
488 | * "s" for second, | |
489 | * "m" for minute, | |
490 | * "h" for hour | |
7010c033 SM |
491 | * |
492 | * The suffix multiply the integer by: | |
81684730 JR |
493 | * "us" : 1 |
494 | * "ms" : 1000 | |
495 | * "s" : 1000000 | |
496 | * "m" : 60000000 | |
497 | * "h" : 3600000000 | |
7010c033 SM |
498 | * |
499 | * Note that unit-less numbers are assumed to be microseconds. | |
500 | * | |
501 | * @param str The string to parse, assumed to be NULL-terminated. | |
502 | * @param time_us Pointer to a uint64_t that will be filled with the | |
503 | * resulting time in microseconds. | |
504 | * | |
505 | * @return 0 on success, -1 on failure. | |
506 | */ | |
7010c033 SM |
507 | int utils_parse_time_suffix(char const * const str, uint64_t * const time_us) |
508 | { | |
509 | int ret; | |
510 | uint64_t base_time; | |
81684730 | 511 | uint64_t multiplier = 1; |
7010c033 SM |
512 | const char *str_end; |
513 | char *num_end; | |
514 | ||
515 | if (!str) { | |
516 | DBG("utils_parse_time_suffix: received a NULL string."); | |
517 | ret = -1; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | /* strtoull will accept a negative number, but we don't want to. */ | |
522 | if (strchr(str, '-') != NULL) { | |
523 | DBG("utils_parse_time_suffix: invalid time string, should not contain '-'."); | |
524 | ret = -1; | |
525 | goto end; | |
526 | } | |
527 | ||
528 | /* str_end will point to the \0 */ | |
529 | str_end = str + strlen(str); | |
530 | errno = 0; | |
531 | base_time = strtoull(str, &num_end, 10); | |
532 | if (errno != 0) { | |
533 | PERROR("utils_parse_time_suffix strtoull on string \"%s\"", str); | |
534 | ret = -1; | |
535 | goto end; | |
536 | } | |
537 | ||
538 | if (num_end == str) { | |
539 | /* strtoull parsed nothing, not good. */ | |
540 | DBG("utils_parse_time_suffix: strtoull had nothing good to parse."); | |
541 | ret = -1; | |
542 | goto end; | |
543 | } | |
544 | ||
545 | /* Check if a prefix is present. */ | |
546 | switch (*num_end) { | |
547 | case 'u': | |
81684730 JR |
548 | /* |
549 | * Microsecond (us) | |
550 | * | |
551 | * Skip the "us" if the string matches the "us" suffix, | |
552 | * otherwise let the check for the end of the string handle | |
553 | * the error reporting. | |
554 | */ | |
555 | if (*(num_end + 1) == 's') { | |
556 | num_end += 2; | |
557 | } | |
7010c033 SM |
558 | break; |
559 | case 'm': | |
81684730 JR |
560 | if (*(num_end + 1) == 's') { |
561 | /* Millisecond (ms) */ | |
562 | multiplier = USEC_PER_MSEC; | |
563 | /* Skip the 's' */ | |
564 | num_end++; | |
565 | } else { | |
566 | /* Minute (m) */ | |
567 | multiplier = USEC_PER_MINUTE; | |
568 | } | |
569 | num_end++; | |
7010c033 SM |
570 | break; |
571 | case 's': | |
81684730 JR |
572 | /* Second */ |
573 | multiplier = USEC_PER_SEC; | |
574 | num_end++; | |
575 | break; | |
576 | case 'h': | |
577 | /* Hour */ | |
578 | multiplier = USEC_PER_HOURS; | |
7010c033 SM |
579 | num_end++; |
580 | break; | |
581 | case '\0': | |
582 | break; | |
583 | default: | |
584 | DBG("utils_parse_time_suffix: invalid suffix."); | |
585 | ret = -1; | |
586 | goto end; | |
587 | } | |
588 | ||
589 | /* Check for garbage after the valid input. */ | |
590 | if (num_end != str_end) { | |
591 | DBG("utils_parse_time_suffix: Garbage after time string."); | |
592 | ret = -1; | |
593 | goto end; | |
594 | } | |
595 | ||
596 | *time_us = base_time * multiplier; | |
597 | ||
598 | /* Check for overflow */ | |
599 | if ((*time_us / multiplier) != base_time) { | |
600 | DBG("utils_parse_time_suffix: oops, overflow detected."); | |
601 | ret = -1; | |
602 | goto end; | |
603 | } | |
604 | ||
605 | ret = 0; | |
606 | end: | |
607 | return ret; | |
608 | } | |
609 | ||
cfa9a5a2 DG |
610 | /* |
611 | * fls: returns the position of the most significant bit. | |
612 | * Returns 0 if no bit is set, else returns the position of the most | |
613 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
614 | */ | |
615 | #if defined(__i386) || defined(__x86_64) | |
616 | static inline unsigned int fls_u32(uint32_t x) | |
617 | { | |
618 | int r; | |
619 | ||
620 | asm("bsrl %1,%0\n\t" | |
621 | "jnz 1f\n\t" | |
622 | "movl $-1,%0\n\t" | |
623 | "1:\n\t" | |
624 | : "=r" (r) : "rm" (x)); | |
625 | return r + 1; | |
626 | } | |
627 | #define HAS_FLS_U32 | |
628 | #endif | |
629 | ||
a1e4ab8b | 630 | #if defined(__x86_64) && defined(__LP64__) |
db5be0a3 JG |
631 | static inline |
632 | unsigned int fls_u64(uint64_t x) | |
633 | { | |
634 | long r; | |
635 | ||
636 | asm("bsrq %1,%0\n\t" | |
637 | "jnz 1f\n\t" | |
638 | "movq $-1,%0\n\t" | |
639 | "1:\n\t" | |
640 | : "=r" (r) : "rm" (x)); | |
641 | return r + 1; | |
642 | } | |
643 | #define HAS_FLS_U64 | |
644 | #endif | |
645 | ||
646 | #ifndef HAS_FLS_U64 | |
647 | static __attribute__((unused)) | |
648 | unsigned int fls_u64(uint64_t x) | |
649 | { | |
650 | unsigned int r = 64; | |
651 | ||
652 | if (!x) | |
653 | return 0; | |
654 | ||
655 | if (!(x & 0xFFFFFFFF00000000ULL)) { | |
656 | x <<= 32; | |
657 | r -= 32; | |
658 | } | |
659 | if (!(x & 0xFFFF000000000000ULL)) { | |
660 | x <<= 16; | |
661 | r -= 16; | |
662 | } | |
663 | if (!(x & 0xFF00000000000000ULL)) { | |
664 | x <<= 8; | |
665 | r -= 8; | |
666 | } | |
667 | if (!(x & 0xF000000000000000ULL)) { | |
668 | x <<= 4; | |
669 | r -= 4; | |
670 | } | |
671 | if (!(x & 0xC000000000000000ULL)) { | |
672 | x <<= 2; | |
673 | r -= 2; | |
674 | } | |
675 | if (!(x & 0x8000000000000000ULL)) { | |
676 | x <<= 1; | |
677 | r -= 1; | |
678 | } | |
679 | return r; | |
680 | } | |
681 | #endif | |
682 | ||
cfa9a5a2 DG |
683 | #ifndef HAS_FLS_U32 |
684 | static __attribute__((unused)) unsigned int fls_u32(uint32_t x) | |
685 | { | |
686 | unsigned int r = 32; | |
687 | ||
688 | if (!x) { | |
689 | return 0; | |
690 | } | |
691 | if (!(x & 0xFFFF0000U)) { | |
692 | x <<= 16; | |
693 | r -= 16; | |
694 | } | |
695 | if (!(x & 0xFF000000U)) { | |
696 | x <<= 8; | |
697 | r -= 8; | |
698 | } | |
699 | if (!(x & 0xF0000000U)) { | |
700 | x <<= 4; | |
701 | r -= 4; | |
702 | } | |
703 | if (!(x & 0xC0000000U)) { | |
704 | x <<= 2; | |
705 | r -= 2; | |
706 | } | |
707 | if (!(x & 0x80000000U)) { | |
708 | x <<= 1; | |
709 | r -= 1; | |
710 | } | |
711 | return r; | |
712 | } | |
713 | #endif | |
714 | ||
715 | /* | |
716 | * Return the minimum order for which x <= (1UL << order). | |
717 | * Return -1 if x is 0. | |
718 | */ | |
cfa9a5a2 DG |
719 | int utils_get_count_order_u32(uint32_t x) |
720 | { | |
721 | if (!x) { | |
722 | return -1; | |
723 | } | |
724 | ||
725 | return fls_u32(x - 1); | |
726 | } | |
feb0f3e5 | 727 | |
db5be0a3 JG |
728 | /* |
729 | * Return the minimum order for which x <= (1UL << order). | |
730 | * Return -1 if x is 0. | |
731 | */ | |
db5be0a3 JG |
732 | int utils_get_count_order_u64(uint64_t x) |
733 | { | |
734 | if (!x) { | |
735 | return -1; | |
736 | } | |
737 | ||
738 | return fls_u64(x - 1); | |
739 | } | |
740 | ||
feb0f3e5 AM |
741 | /** |
742 | * Obtain the value of LTTNG_HOME environment variable, if exists. | |
743 | * Otherwise returns the value of HOME. | |
744 | */ | |
4f00620d | 745 | const char *utils_get_home_dir(void) |
feb0f3e5 AM |
746 | { |
747 | char *val = NULL; | |
04135dbd DG |
748 | struct passwd *pwd; |
749 | ||
e8fa9fb0 | 750 | val = lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR); |
feb0f3e5 | 751 | if (val != NULL) { |
04135dbd DG |
752 | goto end; |
753 | } | |
e8fa9fb0 | 754 | val = lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); |
04135dbd DG |
755 | if (val != NULL) { |
756 | goto end; | |
feb0f3e5 | 757 | } |
04135dbd DG |
758 | |
759 | /* Fallback on the password file entry. */ | |
760 | pwd = getpwuid(getuid()); | |
761 | if (!pwd) { | |
762 | goto end; | |
763 | } | |
764 | val = pwd->pw_dir; | |
765 | ||
766 | DBG3("Home directory is '%s'", val); | |
767 | ||
768 | end: | |
769 | return val; | |
feb0f3e5 | 770 | } |
26fe5938 | 771 | |
fb198a11 JG |
772 | /** |
773 | * Get user's home directory. Dynamically allocated, must be freed | |
774 | * by the caller. | |
775 | */ | |
fb198a11 JG |
776 | char *utils_get_user_home_dir(uid_t uid) |
777 | { | |
778 | struct passwd pwd; | |
779 | struct passwd *result; | |
780 | char *home_dir = NULL; | |
781 | char *buf = NULL; | |
782 | long buflen; | |
783 | int ret; | |
784 | ||
785 | buflen = sysconf(_SC_GETPW_R_SIZE_MAX); | |
786 | if (buflen == -1) { | |
787 | goto end; | |
788 | } | |
789 | retry: | |
a6bc4ca9 | 790 | buf = (char *) zmalloc(buflen); |
fb198a11 JG |
791 | if (!buf) { |
792 | goto end; | |
793 | } | |
794 | ||
795 | ret = getpwuid_r(uid, &pwd, buf, buflen, &result); | |
796 | if (ret || !result) { | |
797 | if (ret == ERANGE) { | |
798 | free(buf); | |
799 | buflen *= 2; | |
800 | goto retry; | |
801 | } | |
802 | goto end; | |
803 | } | |
804 | ||
805 | home_dir = strdup(pwd.pw_dir); | |
806 | end: | |
807 | free(buf); | |
808 | return home_dir; | |
809 | } | |
810 | ||
26fe5938 DG |
811 | /* |
812 | * With the given format, fill dst with the time of len maximum siz. | |
813 | * | |
814 | * Return amount of bytes set in the buffer or else 0 on error. | |
815 | */ | |
26fe5938 DG |
816 | size_t utils_get_current_time_str(const char *format, char *dst, size_t len) |
817 | { | |
818 | size_t ret; | |
819 | time_t rawtime; | |
820 | struct tm *timeinfo; | |
821 | ||
a0377dfe FD |
822 | LTTNG_ASSERT(format); |
823 | LTTNG_ASSERT(dst); | |
26fe5938 DG |
824 | |
825 | /* Get date and time for session path */ | |
826 | time(&rawtime); | |
827 | timeinfo = localtime(&rawtime); | |
411b3154 SM |
828 | DIAGNOSTIC_PUSH |
829 | DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL | |
26fe5938 | 830 | ret = strftime(dst, len, format, timeinfo); |
411b3154 | 831 | DIAGNOSTIC_POP |
26fe5938 | 832 | if (ret == 0) { |
68e6efdd | 833 | ERR("Unable to strftime with format %s at dst %p of len %zu", format, |
26fe5938 DG |
834 | dst, len); |
835 | } | |
836 | ||
837 | return ret; | |
838 | } | |
6c71277b MD |
839 | |
840 | /* | |
28ab59d0 JR |
841 | * Return 0 on success and set *gid to the group_ID matching the passed name. |
842 | * Else -1 if it cannot be found or an error occurred. | |
6c71277b | 843 | */ |
28ab59d0 | 844 | int utils_get_group_id(const char *name, bool warn, gid_t *gid) |
6c71277b | 845 | { |
28ab59d0 JR |
846 | static volatile int warn_once; |
847 | int ret; | |
848 | long sys_len; | |
849 | size_t len; | |
850 | struct group grp; | |
851 | struct group *result; | |
852 | struct lttng_dynamic_buffer buffer; | |
853 | ||
854 | /* Get the system limit, if it exists. */ | |
855 | sys_len = sysconf(_SC_GETGR_R_SIZE_MAX); | |
856 | if (sys_len == -1) { | |
857 | len = 1024; | |
858 | } else { | |
859 | len = (size_t) sys_len; | |
860 | } | |
861 | ||
862 | lttng_dynamic_buffer_init(&buffer); | |
863 | ret = lttng_dynamic_buffer_set_size(&buffer, len); | |
864 | if (ret) { | |
865 | ERR("Failed to allocate group info buffer"); | |
866 | ret = -1; | |
867 | goto error; | |
868 | } | |
6c71277b | 869 | |
28ab59d0 JR |
870 | while ((ret = getgrnam_r(name, &grp, buffer.data, buffer.size, &result)) == ERANGE) { |
871 | const size_t new_len = 2 * buffer.size; | |
6c71277b | 872 | |
28ab59d0 JR |
873 | /* Buffer is not big enough, increase its size. */ |
874 | if (new_len < buffer.size) { | |
875 | ERR("Group info buffer size overflow"); | |
876 | ret = -1; | |
877 | goto error; | |
878 | } | |
879 | ||
880 | ret = lttng_dynamic_buffer_set_size(&buffer, new_len); | |
881 | if (ret) { | |
882 | ERR("Failed to grow group info buffer to %zu bytes", | |
883 | new_len); | |
884 | ret = -1; | |
885 | goto error; | |
6c71277b | 886 | } |
6c71277b | 887 | } |
28ab59d0 | 888 | if (ret) { |
9120e619 JG |
889 | if (ret == ESRCH) { |
890 | DBG("Could not find group file entry for group name '%s'", | |
891 | name); | |
892 | } else { | |
893 | PERROR("Failed to get group file entry for group name '%s'", | |
894 | name); | |
895 | } | |
896 | ||
28ab59d0 JR |
897 | ret = -1; |
898 | goto error; | |
899 | } | |
900 | ||
901 | /* Group not found. */ | |
902 | if (!result) { | |
903 | ret = -1; | |
904 | goto error; | |
905 | } | |
906 | ||
907 | *gid = result->gr_gid; | |
908 | ret = 0; | |
909 | ||
910 | error: | |
911 | if (ret && warn && !warn_once) { | |
912 | WARN("No tracing group detected"); | |
913 | warn_once = 1; | |
914 | } | |
915 | lttng_dynamic_buffer_reset(&buffer); | |
916 | return ret; | |
6c71277b | 917 | } |
8db0dc00 JG |
918 | |
919 | /* | |
920 | * Return a newly allocated option string. This string is to be used as the | |
921 | * optstring argument of getopt_long(), see GETOPT(3). opt_count is the number | |
922 | * of elements in the long_options array. Returns NULL if the string's | |
923 | * allocation fails. | |
924 | */ | |
8db0dc00 JG |
925 | char *utils_generate_optstring(const struct option *long_options, |
926 | size_t opt_count) | |
927 | { | |
928 | int i; | |
929 | size_t string_len = opt_count, str_pos = 0; | |
930 | char *optstring; | |
931 | ||
932 | /* | |
933 | * Compute the necessary string length. One letter per option, two when an | |
934 | * argument is necessary, and a trailing NULL. | |
935 | */ | |
936 | for (i = 0; i < opt_count; i++) { | |
937 | string_len += long_options[i].has_arg ? 1 : 0; | |
938 | } | |
939 | ||
a6bc4ca9 | 940 | optstring = (char *) zmalloc(string_len); |
8db0dc00 JG |
941 | if (!optstring) { |
942 | goto end; | |
943 | } | |
944 | ||
945 | for (i = 0; i < opt_count; i++) { | |
946 | if (!long_options[i].name) { | |
947 | /* Got to the trailing NULL element */ | |
948 | break; | |
949 | } | |
950 | ||
a596dcb9 JG |
951 | if (long_options[i].val != '\0') { |
952 | optstring[str_pos++] = (char) long_options[i].val; | |
953 | if (long_options[i].has_arg) { | |
954 | optstring[str_pos++] = ':'; | |
955 | } | |
8db0dc00 JG |
956 | } |
957 | } | |
958 | ||
959 | end: | |
960 | return optstring; | |
961 | } | |
3d071855 MD |
962 | |
963 | /* | |
964 | * Try to remove a hierarchy of empty directories, recursively. Don't unlink | |
9529ec1b | 965 | * any file. Try to rmdir any empty directory within the hierarchy. |
3d071855 | 966 | */ |
3d071855 MD |
967 | int utils_recursive_rmdir(const char *path) |
968 | { | |
93bed9fe | 969 | int ret; |
cbf53d23 | 970 | struct lttng_directory_handle *handle; |
7a946beb | 971 | |
cbf53d23 JG |
972 | handle = lttng_directory_handle_create(NULL); |
973 | if (!handle) { | |
974 | ret = -1; | |
93bed9fe | 975 | goto end; |
3d071855 | 976 | } |
cbf53d23 | 977 | ret = lttng_directory_handle_remove_subdirectory(handle, path); |
3d071855 | 978 | end: |
cbf53d23 | 979 | lttng_directory_handle_put(handle); |
3d071855 MD |
980 | return ret; |
981 | } | |
93ec662e | 982 | |
93ec662e JD |
983 | int utils_truncate_stream_file(int fd, off_t length) |
984 | { | |
985 | int ret; | |
a5df8828 | 986 | off_t lseek_ret; |
93ec662e JD |
987 | |
988 | ret = ftruncate(fd, length); | |
989 | if (ret < 0) { | |
990 | PERROR("ftruncate"); | |
991 | goto end; | |
992 | } | |
a5df8828 GL |
993 | lseek_ret = lseek(fd, length, SEEK_SET); |
994 | if (lseek_ret < 0) { | |
93ec662e | 995 | PERROR("lseek"); |
a5df8828 | 996 | ret = -1; |
93ec662e JD |
997 | goto end; |
998 | } | |
93ec662e JD |
999 | end: |
1000 | return ret; | |
1001 | } | |
4ba92f18 PP |
1002 | |
1003 | static const char *get_man_bin_path(void) | |
1004 | { | |
b7dce40d | 1005 | char *env_man_path = lttng_secure_getenv(DEFAULT_MAN_BIN_PATH_ENV); |
4ba92f18 PP |
1006 | |
1007 | if (env_man_path) { | |
1008 | return env_man_path; | |
1009 | } | |
1010 | ||
1011 | return DEFAULT_MAN_BIN_PATH; | |
1012 | } | |
1013 | ||
4fc83d94 PP |
1014 | int utils_show_help(int section, const char *page_name, |
1015 | const char *help_msg) | |
4ba92f18 PP |
1016 | { |
1017 | char section_string[8]; | |
1018 | const char *man_bin_path = get_man_bin_path(); | |
4fc83d94 PP |
1019 | int ret = 0; |
1020 | ||
1021 | if (help_msg) { | |
1022 | printf("%s", help_msg); | |
1023 | goto end; | |
1024 | } | |
4ba92f18 PP |
1025 | |
1026 | /* Section integer -> section string */ | |
1027 | ret = sprintf(section_string, "%d", section); | |
a0377dfe | 1028 | LTTNG_ASSERT(ret > 0 && ret < 8); |
4ba92f18 PP |
1029 | |
1030 | /* | |
1031 | * Execute man pager. | |
1032 | * | |
b07e7ef0 | 1033 | * We provide -M to man here because LTTng-tools can |
4ba92f18 PP |
1034 | * be installed outside /usr, in which case its man pages are |
1035 | * not located in the default /usr/share/man directory. | |
1036 | */ | |
b07e7ef0 | 1037 | ret = execlp(man_bin_path, "man", "-M", MANPATH, |
4ba92f18 | 1038 | section_string, page_name, NULL); |
4fc83d94 PP |
1039 | |
1040 | end: | |
4ba92f18 PP |
1041 | return ret; |
1042 | } | |
09b72f7a FD |
1043 | |
1044 | static | |
13dd7782 | 1045 | int read_proc_meminfo_field(const char *field, uint64_t *value) |
09b72f7a FD |
1046 | { |
1047 | int ret; | |
1048 | FILE *proc_meminfo; | |
1049 | char name[PROC_MEMINFO_FIELD_MAX_NAME_LEN] = {}; | |
1050 | ||
1051 | proc_meminfo = fopen(PROC_MEMINFO_PATH, "r"); | |
1052 | if (!proc_meminfo) { | |
1053 | PERROR("Failed to fopen() " PROC_MEMINFO_PATH); | |
1054 | ret = -1; | |
1055 | goto fopen_error; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Read the contents of /proc/meminfo line by line to find the right | |
1060 | * field. | |
1061 | */ | |
1062 | while (!feof(proc_meminfo)) { | |
13dd7782 | 1063 | uint64_t value_kb; |
09b72f7a FD |
1064 | |
1065 | ret = fscanf(proc_meminfo, | |
13dd7782 | 1066 | "%" MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "s %" SCNu64 " kB\n", |
09b72f7a FD |
1067 | name, &value_kb); |
1068 | if (ret == EOF) { | |
1069 | /* | |
1070 | * fscanf() returning EOF can indicate EOF or an error. | |
1071 | */ | |
1072 | if (ferror(proc_meminfo)) { | |
1073 | PERROR("Failed to parse " PROC_MEMINFO_PATH); | |
1074 | } | |
1075 | break; | |
1076 | } | |
1077 | ||
1078 | if (ret == 2 && strcmp(name, field) == 0) { | |
1079 | /* | |
1080 | * This number is displayed in kilo-bytes. Return the | |
1081 | * number of bytes. | |
1082 | */ | |
13dd7782 JR |
1083 | if (value_kb > UINT64_MAX / 1024) { |
1084 | ERR("Overflow on kb to bytes conversion"); | |
1085 | break; | |
1086 | } | |
1087 | ||
1088 | *value = value_kb * 1024; | |
09b72f7a FD |
1089 | ret = 0; |
1090 | goto found; | |
1091 | } | |
1092 | } | |
1093 | /* Reached the end of the file without finding the right field. */ | |
1094 | ret = -1; | |
1095 | ||
1096 | found: | |
1097 | fclose(proc_meminfo); | |
1098 | fopen_error: | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Returns an estimate of the number of bytes of memory available based on the | |
1104 | * the information in `/proc/meminfo`. The number returned by this function is | |
1105 | * a best guess. | |
1106 | */ | |
13dd7782 | 1107 | int utils_get_memory_available(uint64_t *value) |
09b72f7a FD |
1108 | { |
1109 | return read_proc_meminfo_field(PROC_MEMINFO_MEMAVAILABLE_LINE, value); | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Returns the total size of the memory on the system in bytes based on the | |
1114 | * the information in `/proc/meminfo`. | |
1115 | */ | |
13dd7782 | 1116 | int utils_get_memory_total(uint64_t *value) |
09b72f7a FD |
1117 | { |
1118 | return read_proc_meminfo_field(PROC_MEMINFO_MEMTOTAL_LINE, value); | |
1119 | } | |
ce9ee1fb | 1120 | |
ce9ee1fb JR |
1121 | int utils_change_working_directory(const char *path) |
1122 | { | |
1123 | int ret; | |
1124 | ||
a0377dfe | 1125 | LTTNG_ASSERT(path); |
ce9ee1fb JR |
1126 | |
1127 | DBG("Changing working directory to \"%s\"", path); | |
1128 | ret = chdir(path); | |
1129 | if (ret) { | |
1130 | PERROR("Failed to change working directory to \"%s\"", path); | |
1131 | goto end; | |
1132 | } | |
1133 | ||
1134 | /* Check for write access */ | |
1135 | if (access(path, W_OK)) { | |
1136 | if (errno == EACCES) { | |
1137 | /* | |
1138 | * Do not treat this as an error since the permission | |
1139 | * might change in the lifetime of the process | |
1140 | */ | |
1141 | DBG("Working directory \"%s\" is not writable", path); | |
1142 | } else { | |
1143 | PERROR("Failed to check if working directory \"%s\" is writable", | |
1144 | path); | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | end: | |
1149 | return ret; | |
1150 | } | |
159b042f | 1151 | |
159b042f JG |
1152 | enum lttng_error_code utils_user_id_from_name(const char *user_name, uid_t *uid) |
1153 | { | |
1154 | struct passwd p, *pres; | |
1155 | int ret; | |
1156 | enum lttng_error_code ret_val = LTTNG_OK; | |
1157 | char *buf = NULL; | |
1158 | ssize_t buflen; | |
1159 | ||
1160 | buflen = sysconf(_SC_GETPW_R_SIZE_MAX); | |
1161 | if (buflen < 0) { | |
1162 | buflen = FALLBACK_USER_BUFLEN; | |
1163 | } | |
1164 | ||
a6bc4ca9 | 1165 | buf = (char *) zmalloc(buflen); |
159b042f JG |
1166 | if (!buf) { |
1167 | ret_val = LTTNG_ERR_NOMEM; | |
1168 | goto end; | |
1169 | } | |
1170 | ||
1171 | for (;;) { | |
1172 | ret = getpwnam_r(user_name, &p, buf, buflen, &pres); | |
1173 | switch (ret) { | |
1174 | case EINTR: | |
1175 | continue; | |
1176 | case ERANGE: | |
1177 | buflen *= 2; | |
1178 | free(buf); | |
a6bc4ca9 | 1179 | buf = (char *) zmalloc(buflen); |
159b042f JG |
1180 | if (!buf) { |
1181 | ret_val = LTTNG_ERR_NOMEM; | |
1182 | goto end; | |
1183 | } | |
1184 | continue; | |
1185 | default: | |
1186 | goto end_loop; | |
1187 | } | |
1188 | } | |
1189 | end_loop: | |
1190 | ||
1191 | switch (ret) { | |
1192 | case 0: | |
1193 | if (pres == NULL) { | |
1194 | ret_val = LTTNG_ERR_USER_NOT_FOUND; | |
1195 | } else { | |
1196 | *uid = p.pw_uid; | |
1197 | DBG("Lookup of tracker UID/VUID: name '%s' maps to uid %" PRId64, | |
1198 | user_name, (int64_t) *uid); | |
1199 | ret_val = LTTNG_OK; | |
1200 | } | |
1201 | break; | |
1202 | case ENOENT: | |
1203 | case ESRCH: | |
1204 | case EBADF: | |
1205 | case EPERM: | |
1206 | ret_val = LTTNG_ERR_USER_NOT_FOUND; | |
1207 | break; | |
1208 | default: | |
1209 | ret_val = LTTNG_ERR_NOMEM; | |
1210 | } | |
1211 | end: | |
1212 | free(buf); | |
1213 | return ret_val; | |
1214 | } | |
1215 | ||
159b042f JG |
1216 | enum lttng_error_code utils_group_id_from_name( |
1217 | const char *group_name, gid_t *gid) | |
1218 | { | |
1219 | struct group g, *gres; | |
1220 | int ret; | |
1221 | enum lttng_error_code ret_val = LTTNG_OK; | |
1222 | char *buf = NULL; | |
1223 | ssize_t buflen; | |
1224 | ||
1225 | buflen = sysconf(_SC_GETGR_R_SIZE_MAX); | |
1226 | if (buflen < 0) { | |
1227 | buflen = FALLBACK_GROUP_BUFLEN; | |
1228 | } | |
1229 | ||
a6bc4ca9 | 1230 | buf = (char *) zmalloc(buflen); |
159b042f JG |
1231 | if (!buf) { |
1232 | ret_val = LTTNG_ERR_NOMEM; | |
1233 | goto end; | |
1234 | } | |
1235 | ||
1236 | for (;;) { | |
1237 | ret = getgrnam_r(group_name, &g, buf, buflen, &gres); | |
1238 | switch (ret) { | |
1239 | case EINTR: | |
1240 | continue; | |
1241 | case ERANGE: | |
1242 | buflen *= 2; | |
1243 | free(buf); | |
a6bc4ca9 | 1244 | buf = (char *) zmalloc(buflen); |
159b042f JG |
1245 | if (!buf) { |
1246 | ret_val = LTTNG_ERR_NOMEM; | |
1247 | goto end; | |
1248 | } | |
1249 | continue; | |
1250 | default: | |
1251 | goto end_loop; | |
1252 | } | |
1253 | } | |
1254 | end_loop: | |
1255 | ||
1256 | switch (ret) { | |
1257 | case 0: | |
1258 | if (gres == NULL) { | |
1259 | ret_val = LTTNG_ERR_GROUP_NOT_FOUND; | |
1260 | } else { | |
1261 | *gid = g.gr_gid; | |
1262 | DBG("Lookup of tracker GID/GUID: name '%s' maps to gid %" PRId64, | |
1263 | group_name, (int64_t) *gid); | |
1264 | ret_val = LTTNG_OK; | |
1265 | } | |
1266 | break; | |
1267 | case ENOENT: | |
1268 | case ESRCH: | |
1269 | case EBADF: | |
1270 | case EPERM: | |
1271 | ret_val = LTTNG_ERR_GROUP_NOT_FOUND; | |
1272 | break; | |
1273 | default: | |
1274 | ret_val = LTTNG_ERR_NOMEM; | |
1275 | } | |
1276 | end: | |
1277 | free(buf); | |
1278 | return ret_val; | |
1279 | } | |
240baf2b | 1280 | |
240baf2b JR |
1281 | int utils_parse_unsigned_long_long(const char *str, |
1282 | unsigned long long *value) | |
1283 | { | |
1284 | int ret; | |
1285 | char *endptr; | |
1286 | ||
a0377dfe FD |
1287 | LTTNG_ASSERT(str); |
1288 | LTTNG_ASSERT(value); | |
240baf2b JR |
1289 | |
1290 | errno = 0; | |
1291 | *value = strtoull(str, &endptr, 10); | |
1292 | ||
1293 | /* Conversion failed. Out of range? */ | |
1294 | if (errno != 0) { | |
1295 | /* Don't print an error; allow the caller to log a better error. */ | |
1296 | DBG("Failed to parse string as unsigned long long number: string = '%s', errno = %d", | |
1297 | str, errno); | |
1298 | ret = -1; | |
1299 | goto end; | |
1300 | } | |
1301 | ||
1302 | /* Not the end of the string or empty string. */ | |
1303 | if (*endptr || endptr == str) { | |
1304 | DBG("Failed to parse string as unsigned long long number: string = '%s'", | |
1305 | str); | |
1306 | ret = -1; | |
1307 | goto end; | |
1308 | } | |
1309 | ||
1310 | ret = 0; | |
1311 | ||
1312 | end: | |
1313 | return ret; | |
1314 | } |