src/basic/util.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <alloca.h>
  25 #include <dirent.h>
  26 #include <fcntl.h>
  27 #include <inttypes.h>
  28 #include <limits.h>
  29 #include <locale.h>
  30 #include <mntent.h>
  31 #include <stdarg.h>
  32 #include <stdbool.h>
  33 #include <stddef.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <sys/inotify.h>
  37 #include <sys/socket.h>
  38 #include <sys/stat.h>
  39 #include <sys/statfs.h>
  40 #include <sys/types.h>
  41 #include <time.h>
  42 #include <unistd.h>
  43
  44 #include "formats-util.h"
  45 #include "macro.h"
  46 #include "missing.h"
  47 #include "time-util.h"
  48
  49 /* What is interpreted as whitespace? */
  50 #define WHITESPACE " \t\n\r"
  51 #define NEWLINE    "\n\r"
  52 #define QUOTES     "\"\'"
  53 #define COMMENTS   "#;"
  54 #define GLOB_CHARS "*?["
  55
  56 size_t page_size(void) _pure_;
  57 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
  58
  59 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
  60
  61 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
  62
  63 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
  64
  65 #define newa0(t, n) ((t*) alloca0(sizeof(t)*(n)))
  66
  67 #define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
  68
  69 #define malloc0(n) (calloc(1, (n)))
  70
  71 static inline void *mfree(void *memory) {
  72         free(memory);
  73         return NULL;
  74 }
  75
  76 static inline const char* yes_no(bool b) {
  77         return b ? "yes" : "no";
  78 }
  79
  80 static inline const char* true_false(bool b) {
  81         return b ? "true" : "false";
  82 }
  83
  84 static inline const char* one_zero(bool b) {
  85         return b ? "1" : "0";
  86 }
  87
  88 int readlinkat_malloc(int fd, const char *p, char **ret);
  89 int readlink_malloc(const char *p, char **r);
  90 int readlink_value(const char *p, char **ret);
  91 int readlink_and_make_absolute(const char *p, char **r);
  92 int readlink_and_canonicalize(const char *p, char **r);
  93
  94 char *file_in_same_dir(const char *path, const char *filename);
  95
  96 int rmdir_parents(const char *path, const char *stop);
  97
  98 char hexchar(int x) _const_;
  99 int unhexchar(char c) _const_;
 100 char octchar(int x) _const_;
 101 int unoctchar(char c) _const_;
 102 char decchar(int x) _const_;
 103 int undecchar(char c) _const_;
 104 char base32hexchar(int x) _const_;
 105 int unbase32hexchar(char c) _const_;
 106 char base64char(int x) _const_;
 107 int unbase64char(char c) _const_;
 108
 109 bool dirent_is_file(const struct dirent *de) _pure_;
 110 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
 111
 112 bool hidden_file(const char *filename) _pure_;
 113
 114 /* For basic lookup tables with strictly enumerated entries */
 115 #define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
 116         scope const char *name##_to_string(type i) {                    \
 117                 if (i < 0 || i >= (type) ELEMENTSOF(name##_table))      \
 118                         return NULL;                                    \
 119                 return name##_table[i];                                 \
 120         }
 121
 122 ssize_t string_table_lookup(const char * const *table, size_t len, const char *key);
 123
 124 #define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
 125         scope type name##_from_string(const char *s) {                  \
 126                 return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
 127         }
 128
 129 #define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope)                    \
 130         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
 131         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
 132         struct __useless_struct_to_allow_trailing_semicolon__
 133
 134 #define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
 135 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
 136 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
 137 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)
 138
 139 /* For string conversions where numbers are also acceptable */
 140 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max)         \
 141         int name##_to_string_alloc(type i, char **str) {                \
 142                 char *s;                                                \
 143                 if (i < 0 || i > max)                                   \
 144                         return -ERANGE;                                 \
 145                 if (i < (type) ELEMENTSOF(name##_table)) {              \
 146                         s = strdup(name##_table[i]);                    \
 147                         if (!s)                                         \
 148                                 return -ENOMEM;                         \
 149                 } else {                                                \
 150                         if (asprintf(&s, "%i", i) < 0)                  \
 151                                 return -ENOMEM;                         \
 152                 }                                                       \
 153                 *str = s;                                               \
 154                 return 0;                                               \
 155         }                                                               \
 156         type name##_from_string(const char *s) {                        \
 157                 type i;                                                 \
 158                 unsigned u = 0;                                         \
 159                 if (!s)                                                 \
 160                         return (type) -1;                               \
 161                 for (i = 0; i < (type) ELEMENTSOF(name##_table); i++)   \
 162                         if (streq_ptr(name##_table[i], s))              \
 163                                 return i;                               \
 164                 if (safe_atou(s, &u) >= 0 && u <= max)                  \
 165                         return (type) u;                                \
 166                 return (type) -1;                                       \
 167         }                                                               \
 168         struct __useless_struct_to_allow_trailing_semicolon__
 169
 170 bool fstype_is_network(const char *fstype);
 171
 172 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
 173
 174 bool is_device_path(const char *path);
 175
 176 int dir_is_empty(const char *path);
 177 char* dirname_malloc(const char *path);
 178
 179 static inline int dir_is_populated(const char *path) {
 180         int r;
 181         r = dir_is_empty(path);
 182         if (r < 0)
 183                 return r;
 184         return !r;
 185 }
 186
 187 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
 188 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
 189
 190 typedef long statfs_f_type_t;
 191
 192 bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) _pure_;
 193 int fd_check_fstype(int fd, statfs_f_type_t magic_value);
 194 int path_check_fstype(const char *path, statfs_f_type_t magic_value);
 195
 196 bool is_temporary_fs(const struct statfs *s) _pure_;
 197 int fd_is_temporary_fs(int fd);
 198
 199 #define xsprintf(buf, fmt, ...) \
 200         assert_message_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf), \
 201                           "xsprintf: " #buf "[] must be big enough")
 202
 203 int files_same(const char *filea, const char *fileb);
 204
 205 int running_in_chroot(void);
 206
 207 int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode);
 208 int touch(const char *path);
 209
 210 noreturn void freeze(void);
 211
 212 bool null_or_empty(struct stat *st) _pure_;
 213 int null_or_empty_path(const char *fn);
 214 int null_or_empty_fd(int fd);
 215
 216 DIR *xopendirat(int dirfd, const char *name, int flags);
 217
 218 char *fstab_node_to_udev_node(const char *p);
 219
 220 void execute_directories(const char* const* directories, usec_t timeout, char *argv[]);
 221
 222 bool plymouth_running(void);
 223
 224 int symlink_idempotent(const char *from, const char *to);
 225
 226 int symlink_atomic(const char *from, const char *to);
 227 int mknod_atomic(const char *path, mode_t mode, dev_t dev);
 228 int mkfifo_atomic(const char *path, mode_t mode);
 229
 230 int fchmod_umask(int fd, mode_t mode);
 231
 232 bool display_is_local(const char *display) _pure_;
 233 int socket_from_display(const char *display, char **path);
 234
 235 int glob_exists(const char *path);
 236 int glob_extend(char ***strv, const char *path);
 237
 238 int dirent_ensure_type(DIR *d, struct dirent *de);
 239
 240 int get_files_in_directory(const char *path, char ***list);
 241
 242 bool is_main_thread(void);
 243
 244 int block_get_whole_disk(dev_t d, dev_t *ret);
 245
 246 #define NULSTR_FOREACH(i, l)                                    \
 247         for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
 248
 249 #define NULSTR_FOREACH_PAIR(i, j, l)                             \
 250         for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
 251
 252 int ioprio_class_to_string_alloc(int i, char **s);
 253 int ioprio_class_from_string(const char *s);
 254
 255 const char *sigchld_code_to_string(int i) _const_;
 256 int sigchld_code_from_string(const char *s) _pure_;
 257
 258 int log_facility_unshifted_to_string_alloc(int i, char **s);
 259 int log_facility_unshifted_from_string(const char *s);
 260 bool log_facility_unshifted_is_valid(int faciliy);
 261
 262 int log_level_to_string_alloc(int i, char **s);
 263 int log_level_from_string(const char *s);
 264 bool log_level_is_valid(int level);
 265
 266 int sched_policy_to_string_alloc(int i, char **s);
 267 int sched_policy_from_string(const char *s);
 268
 269 const char *rlimit_to_string(int i) _const_;
 270 int rlimit_from_string(const char *s) _pure_;
 271
 272 extern int saved_argc;
 273 extern char **saved_argv;
 274
 275 bool kexec_loaded(void);
 276
 277 int prot_from_flags(int flags) _const_;
 278
 279 void* memdup(const void *p, size_t l) _alloc_(2);
 280
 281 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
 282
 283 int setrlimit_closest(int resource, const struct rlimit *rlim);
 284
 285 bool http_url_is_valid(const char *url) _pure_;
 286 bool documentation_url_is_valid(const char *url) _pure_;
 287
 288 bool http_etag_is_valid(const char *etag);
 289
 290 bool in_initrd(void);
 291
 292 static inline void freep(void *p) {
 293         free(*(void**) p);
 294 }
 295
 296 static inline void umaskp(mode_t *u) {
 297         umask(*u);
 298 }
 299
 300 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
 301
 302 #define _cleanup_free_ _cleanup_(freep)
 303 #define _cleanup_umask_ _cleanup_(umaskp)
 304 #define _cleanup_globfree_ _cleanup_(globfree)
 305 #define _cleanup_endmntent_ _cleanup_(endmntentp)
 306
 307 _malloc_  _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b) {
 308         if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
 309                 return NULL;
 310
 311         return malloc(a * b);
 312 }
 313
 314 _alloc_(2, 3) static inline void *realloc_multiply(void *p, size_t a, size_t b) {
 315         if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
 316                 return NULL;
 317
 318         return realloc(p, a * b);
 319 }
 320
 321 _alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
 322         if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
 323                 return NULL;
 324
 325         return memdup(p, a * b);
 326 }
 327
 328 bool filename_is_valid(const char *p) _pure_;
 329 bool path_is_safe(const char *p) _pure_;
 330 bool string_is_safe(const char *p) _pure_;
 331
 332 /**
 333  * Check if a string contains any glob patterns.
 334  */
 335 _pure_ static inline bool string_is_glob(const char *p) {
 336         return !!strpbrk(p, GLOB_CHARS);
 337 }
 338
 339 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
 340                  int (*compar) (const void *, const void *, void *),
 341                  void *arg);
 342
 343 #define _(String) gettext (String)
 344 #define N_(String) String
 345 void init_gettext(void);
 346 bool is_locale_utf8(void);
 347
 348 typedef enum DrawSpecialChar {
 349         DRAW_TREE_VERTICAL,
 350         DRAW_TREE_BRANCH,
 351         DRAW_TREE_RIGHT,
 352         DRAW_TREE_SPACE,
 353         DRAW_TRIANGULAR_BULLET,
 354         DRAW_BLACK_CIRCLE,
 355         DRAW_ARROW,
 356         DRAW_DASH,
 357         _DRAW_SPECIAL_CHAR_MAX
 358 } DrawSpecialChar;
 359
 360 const char *draw_special_char(DrawSpecialChar ch);
 361
 362 int on_ac_power(void);
 363
 364 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f);
 365 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f);
 366
 367 #define FOREACH_LINE(line, f, on_error)                         \
 368         for (;;)                                                \
 369                 if (!fgets(line, sizeof(line), f)) {            \
 370                         if (ferror(f)) {                        \
 371                                 on_error;                       \
 372                         }                                       \
 373                         break;                                  \
 374                 } else
 375
 376 #define FOREACH_DIRENT(de, d, on_error)                                 \
 377         for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d))   \
 378                 if (!de) {                                              \
 379                         if (errno > 0) {                                \
 380                                 on_error;                               \
 381                         }                                               \
 382                         break;                                          \
 383                 } else if (hidden_file((de)->d_name))                   \
 384                         continue;                                       \
 385                 else
 386
 387 #define FOREACH_DIRENT_ALL(de, d, on_error)                             \
 388         for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d))   \
 389                 if (!de) {                                              \
 390                         if (errno > 0) {                                \
 391                                 on_error;                               \
 392                         }                                               \
 393                         break;                                          \
 394                 } else
 395
 396 static inline void *mempset(void *s, int c, size_t n) {
 397         memset(s, c, n);
 398         return (uint8_t*)s + n;
 399 }
 400
 401 char *hexmem(const void *p, size_t l);
 402 int unhexmem(const char *p, size_t l, void **mem, size_t *len);
 403
 404 char *base32hexmem(const void *p, size_t l, bool padding);
 405 int unbase32hexmem(const char *p, size_t l, bool padding, void **mem, size_t *len);
 406
 407 char *base64mem(const void *p, size_t l);
 408 int unbase64mem(const char *p, size_t l, void **mem, size_t *len);
 409
 410 void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size);
 411 void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size);
 412 #define GREEDY_REALLOC(array, allocated, need)                          \
 413         greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
 414
 415 #define GREEDY_REALLOC0(array, allocated, need)                         \
 416         greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
 417
 418 static inline void _reset_errno_(int *saved_errno) {
 419         errno = *saved_errno;
 420 }
 421
 422 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
 423
 424 static inline int negative_errno(void) {
 425         /* This helper should be used to shut up gcc if you know 'errno' is
 426          * negative. Instead of "return -errno;", use "return negative_errno();"
 427          * It will suppress bogus gcc warnings in case it assumes 'errno' might
 428          * be 0 and thus the caller's error-handling might not be triggered. */
 429         assert_return(errno > 0, -EINVAL);
 430         return -errno;
 431 }
 432
 433 struct _umask_struct_ {
 434         mode_t mask;
 435         bool quit;
 436 };
 437
 438 static inline void _reset_umask_(struct _umask_struct_ *s) {
 439         umask(s->mask);
 440 };
 441
 442 #define RUN_WITH_UMASK(mask)                                            \
 443         for (_cleanup_(_reset_umask_) struct _umask_struct_ _saved_umask_ = { umask(mask), false }; \
 444              !_saved_umask_.quit ;                                      \
 445              _saved_umask_.quit = true)
 446
 447 static inline unsigned u64log2(uint64_t n) {
 448 #if __SIZEOF_LONG_LONG__ == 8
 449         return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
 450 #else
 451 #error "Wut?"
 452 #endif
 453 }
 454
 455 static inline unsigned u32ctz(uint32_t n) {
 456 #if __SIZEOF_INT__ == 4
 457         return __builtin_ctz(n);
 458 #else
 459 #error "Wut?"
 460 #endif
 461 }
 462
 463 static inline unsigned log2i(int x) {
 464         assert(x > 0);
 465
 466         return __SIZEOF_INT__ * 8 - __builtin_clz(x) - 1;
 467 }
 468
 469 static inline unsigned log2u(unsigned x) {
 470         assert(x > 0);
 471
 472         return sizeof(unsigned) * 8 - __builtin_clz(x) - 1;
 473 }
 474
 475 static inline unsigned log2u_round_up(unsigned x) {
 476         assert(x > 0);
 477
 478         if (x == 1)
 479                 return 0;
 480
 481         return log2u(x - 1) + 1;
 482 }
 483
 484 #define DECIMAL_STR_WIDTH(x)                            \
 485         ({                                              \
 486                 typeof(x) _x_ = (x);                    \
 487                 unsigned ans = 1;                       \
 488                 while (_x_ /= 10)                       \
 489                         ans++;                          \
 490                 ans;                                    \
 491         })
 492
 493 int unlink_noerrno(const char *path);
 494
 495 #define alloca0(n)                                      \
 496         ({                                              \
 497                 char *_new_;                            \
 498                 size_t _len_ = n;                       \
 499                 _new_ = alloca(_len_);                  \
 500                 (void *) memset(_new_, 0, _len_);       \
 501         })
 502
 503 /* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
 504 #define alloca_align(size, align)                                       \
 505         ({                                                              \
 506                 void *_ptr_;                                            \
 507                 size_t _mask_ = (align) - 1;                            \
 508                 _ptr_ = alloca((size) + _mask_);                        \
 509                 (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_);         \
 510         })
 511
 512 #define alloca0_align(size, align)                                      \
 513         ({                                                              \
 514                 void *_new_;                                            \
 515                 size_t _size_ = (size);                                 \
 516                 _new_ = alloca_align(_size_, (align));                  \
 517                 (void*)memset(_new_, 0, _size_);                        \
 518         })
 519
 520 bool id128_is_valid(const char *s) _pure_;
 521
 522 int shall_restore_state(void);
 523
 524 /**
 525  * Normal qsort requires base to be nonnull. Here were require
 526  * that only if nmemb > 0.
 527  */
 528 static inline void qsort_safe(void *base, size_t nmemb, size_t size, comparison_fn_t compar) {
 529         if (nmemb <= 1)
 530                 return;
 531
 532         assert(base);
 533         qsort(base, nmemb, size, compar);
 534 }
 535
 536 int proc_cmdline(char **ret);
 537 int parse_proc_cmdline(int (*parse_word)(const char *key, const char *value));
 538 int get_proc_cmdline_key(const char *parameter, char **value);
 539
 540 int container_get_leader(const char *machine, pid_t *pid);
 541
 542 int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd);
 543 int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd);
 544
 545 int mkostemp_safe(char *pattern, int flags);
 546 int open_tmpfile(const char *path, int flags);
 547
 548 int fd_warn_permissions(const char *path, int fd);
 549
 550 #ifndef PERSONALITY_INVALID
 551 /* personality(7) documents that 0xffffffffUL is used for querying the
 552  * current personality, hence let's use that here as error
 553  * indicator. */
 554 #define PERSONALITY_INVALID 0xffffffffLU
 555 #endif
 556
 557 unsigned long personality_from_string(const char *p);
 558 const char *personality_to_string(unsigned long);
 559
 560 uint64_t physical_memory(void);
 561
 562 void hexdump(FILE *f, const void *p, size_t s);
 563
 564 union file_handle_union {
 565         struct file_handle handle;
 566         char padding[sizeof(struct file_handle) + MAX_HANDLE_SZ];
 567 };
 568 #define FILE_HANDLE_INIT { .handle.handle_bytes = MAX_HANDLE_SZ }
 569
 570 int update_reboot_param_file(const char *param);
 571
 572 int umount_recursive(const char *target, int flags);
 573
 574 int bind_remount_recursive(const char *prefix, bool ro);
 575
 576 int fflush_and_check(FILE *f);
 577
 578 int tempfn_xxxxxx(const char *p, const char *extra, char **ret);
 579 int tempfn_random(const char *p, const char *extra, char **ret);
 580 int tempfn_random_child(const char *p, const char *extra, char **ret);
 581
 582 int take_password_lock(const char *root);
 583
 584 int is_symlink(const char *path);
 585 int is_dir(const char *path, bool follow);
 586 int is_device_node(const char *path);
 587
 588 #define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX + 1)
 589
 590 #define FOREACH_INOTIFY_EVENT(e, buffer, sz) \
 591         for ((e) = &buffer.ev;                                \
 592              (uint8_t*) (e) < (uint8_t*) (buffer.raw) + (sz); \
 593              (e) = (struct inotify_event*) ((uint8_t*) (e) + sizeof(struct inotify_event) + (e)->len))
 594
 595 union inotify_event_buffer {
 596         struct inotify_event ev;
 597         uint8_t raw[INOTIFY_EVENT_MAX];
 598 };
 599
 600 #define laccess(path, mode) faccessat(AT_FDCWD, (path), (mode), AT_SYMLINK_NOFOLLOW)
 601
 602 ssize_t fgetxattrat_fake(int dirfd, const char *filename, const char *attribute, void *value, size_t size, int flags);
 603
 604 int fd_setcrtime(int fd, usec_t usec);
 605 int fd_getcrtime(int fd, usec_t *usec);
 606 int path_getcrtime(const char *p, usec_t *usec);
 607 int fd_getcrtime_at(int dirfd, const char *name, usec_t *usec, int flags);
 608
 609 int chattr_fd(int fd, unsigned value, unsigned mask);
 610 int chattr_path(const char *p, unsigned value, unsigned mask);
 611
 612 int read_attr_fd(int fd, unsigned *ret);
 613 int read_attr_path(const char *p, unsigned *ret);
 614
 615 #define RLIMIT_MAKE_CONST(lim) ((struct rlimit) { lim, lim })
 616
 617 int syslog_parse_priority(const char **p, int *priority, bool with_facility);
 618
 619 int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath);
 620
 621 int mount_move_root(const char *path);
 622
 623 int getxattr_malloc(const char *path, const char *name, char **value, bool allow_symlink);
 624 int fgetxattr_malloc(int fd, const char *name, char **value);
 625
 626 int version(void);
 627
 628 bool fdname_is_valid(const char *s);
 629
 630 bool oom_score_adjust_is_valid(int oa);