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