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 bool dirent_is_file(const struct dirent *de) _pure_;
  99 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
 100
 101 bool hidden_file(const char *filename) _pure_;
 102
 103 /* For basic lookup tables with strictly enumerated entries */
 104 #define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
 105         scope const char *name##_to_string(type i) {                    \
 106                 if (i < 0 || i >= (type) ELEMENTSOF(name##_table))      \
 107                         return NULL;                                    \
 108                 return name##_table[i];                                 \
 109         }
 110
 111 ssize_t string_table_lookup(const char * const *table, size_t len, const char *key);
 112
 113 #define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
 114         scope type name##_from_string(const char *s) {                  \
 115                 return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
 116         }
 117
 118 #define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope)                    \
 119         _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
 120         _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
 121         struct __useless_struct_to_allow_trailing_semicolon__
 122
 123 #define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
 124 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
 125 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
 126 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)
 127
 128 /* For string conversions where numbers are also acceptable */
 129 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max)         \
 130         int name##_to_string_alloc(type i, char **str) {                \
 131                 char *s;                                                \
 132                 if (i < 0 || i > max)                                   \
 133                         return -ERANGE;                                 \
 134                 if (i < (type) ELEMENTSOF(name##_table)) {              \
 135                         s = strdup(name##_table[i]);                    \
 136                         if (!s)                                         \
 137                                 return -ENOMEM;                         \
 138                 } else {                                                \
 139                         if (asprintf(&s, "%i", i) < 0)                  \
 140                                 return -ENOMEM;                         \
 141                 }                                                       \
 142                 *str = s;                                               \
 143                 return 0;                                               \
 144         }                                                               \
 145         type name##_from_string(const char *s) {                        \
 146                 type i;                                                 \
 147                 unsigned u = 0;                                         \
 148                 if (!s)                                                 \
 149                         return (type) -1;                               \
 150                 for (i = 0; i < (type) ELEMENTSOF(name##_table); i++)   \
 151                         if (streq_ptr(name##_table[i], s))              \
 152                                 return i;                               \
 153                 if (safe_atou(s, &u) >= 0 && u <= max)                  \
 154                         return (type) u;                                \
 155                 return (type) -1;                                       \
 156         }                                                               \
 157         struct __useless_struct_to_allow_trailing_semicolon__
 158
 159 bool fstype_is_network(const char *fstype);
 160
 161 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
 162
 163 bool is_device_path(const char *path);
 164
 165 int dir_is_empty(const char *path);
 166 char* dirname_malloc(const char *path);
 167
 168 static inline int dir_is_populated(const char *path) {
 169         int r;
 170         r = dir_is_empty(path);
 171         if (r < 0)
 172                 return r;
 173         return !r;
 174 }
 175
 176 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
 177 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
 178
 179 typedef long statfs_f_type_t;
 180
 181 bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) _pure_;
 182 int fd_check_fstype(int fd, statfs_f_type_t magic_value);
 183 int path_check_fstype(const char *path, statfs_f_type_t magic_value);
 184
 185 bool is_temporary_fs(const struct statfs *s) _pure_;
 186 int fd_is_temporary_fs(int fd);
 187
 188 #define xsprintf(buf, fmt, ...) \
 189         assert_message_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf), \
 190                           "xsprintf: " #buf "[] must be big enough")
 191
 192 int files_same(const char *filea, const char *fileb);
 193
 194 int running_in_chroot(void);
 195
 196 int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode);
 197 int touch(const char *path);
 198
 199 noreturn void freeze(void);
 200
 201 bool null_or_empty(struct stat *st) _pure_;
 202 int null_or_empty_path(const char *fn);
 203 int null_or_empty_fd(int fd);
 204
 205 DIR *xopendirat(int dirfd, const char *name, int flags);
 206
 207 char *fstab_node_to_udev_node(const char *p);
 208
 209 void execute_directories(const char* const* directories, usec_t timeout, char *argv[]);
 210
 211 bool plymouth_running(void);
 212
 213 int symlink_idempotent(const char *from, const char *to);
 214
 215 int symlink_atomic(const char *from, const char *to);
 216 int mknod_atomic(const char *path, mode_t mode, dev_t dev);
 217 int mkfifo_atomic(const char *path, mode_t mode);
 218
 219 int fchmod_umask(int fd, mode_t mode);
 220
 221 bool display_is_local(const char *display) _pure_;
 222 int socket_from_display(const char *display, char **path);
 223
 224 int glob_exists(const char *path);
 225 int glob_extend(char ***strv, const char *path);
 226
 227 int dirent_ensure_type(DIR *d, struct dirent *de);
 228
 229 int get_files_in_directory(const char *path, char ***list);
 230
 231 bool is_main_thread(void);
 232
 233 int block_get_whole_disk(dev_t d, dev_t *ret);
 234
 235 #define NULSTR_FOREACH(i, l)                                    \
 236         for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
 237
 238 #define NULSTR_FOREACH_PAIR(i, j, l)                             \
 239         for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
 240
 241 int ioprio_class_to_string_alloc(int i, char **s);
 242 int ioprio_class_from_string(const char *s);
 243
 244 const char *sigchld_code_to_string(int i) _const_;
 245 int sigchld_code_from_string(const char *s) _pure_;
 246
 247 int log_facility_unshifted_to_string_alloc(int i, char **s);
 248 int log_facility_unshifted_from_string(const char *s);
 249 bool log_facility_unshifted_is_valid(int faciliy);
 250
 251 int log_level_to_string_alloc(int i, char **s);
 252 int log_level_from_string(const char *s);
 253 bool log_level_is_valid(int level);
 254
 255 int sched_policy_to_string_alloc(int i, char **s);
 256 int sched_policy_from_string(const char *s);
 257
 258 const char *rlimit_to_string(int i) _const_;
 259 int rlimit_from_string(const char *s) _pure_;
 260
 261 extern int saved_argc;
 262 extern char **saved_argv;
 263
 264 bool kexec_loaded(void);
 265
 266 int prot_from_flags(int flags) _const_;
 267
 268 void* memdup(const void *p, size_t l) _alloc_(2);
 269
 270 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
 271
 272 int setrlimit_closest(int resource, const struct rlimit *rlim);
 273
 274 bool http_url_is_valid(const char *url) _pure_;
 275 bool documentation_url_is_valid(const char *url) _pure_;
 276
 277 bool http_etag_is_valid(const char *etag);
 278
 279 bool in_initrd(void);
 280
 281 static inline void freep(void *p) {
 282         free(*(void**) p);
 283 }
 284
 285 static inline void umaskp(mode_t *u) {
 286         umask(*u);
 287 }
 288
 289 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
 290
 291 #define _cleanup_free_ _cleanup_(freep)
 292 #define _cleanup_umask_ _cleanup_(umaskp)
 293 #define _cleanup_globfree_ _cleanup_(globfree)
 294 #define _cleanup_endmntent_ _cleanup_(endmntentp)
 295
 296 _malloc_  _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b) {
 297         if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
 298                 return NULL;
 299
 300         return malloc(a * b);
 301 }
 302
 303 _alloc_(2, 3) static inline void *realloc_multiply(void *p, size_t a, size_t b) {
 304         if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
 305                 return NULL;
 306
 307         return realloc(p, a * b);
 308 }
 309
 310 _alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
 311         if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
 312                 return NULL;
 313
 314         return memdup(p, a * b);
 315 }
 316
 317 bool filename_is_valid(const char *p) _pure_;
 318 bool path_is_safe(const char *p) _pure_;
 319 bool string_is_safe(const char *p) _pure_;
 320
 321 /**
 322  * Check if a string contains any glob patterns.
 323  */
 324 _pure_ static inline bool string_is_glob(const char *p) {
 325         return !!strpbrk(p, GLOB_CHARS);
 326 }
 327
 328 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
 329                  int (*compar) (const void *, const void *, void *),
 330                  void *arg);
 331
 332 #define _(String) gettext (String)
 333 #define N_(String) String
 334 void init_gettext(void);
 335 bool is_locale_utf8(void);
 336
 337 typedef enum DrawSpecialChar {
 338         DRAW_TREE_VERTICAL,
 339         DRAW_TREE_BRANCH,
 340         DRAW_TREE_RIGHT,
 341         DRAW_TREE_SPACE,
 342         DRAW_TRIANGULAR_BULLET,
 343         DRAW_BLACK_CIRCLE,
 344         DRAW_ARROW,
 345         DRAW_DASH,
 346         _DRAW_SPECIAL_CHAR_MAX
 347 } DrawSpecialChar;
 348
 349 const char *draw_special_char(DrawSpecialChar ch);
 350
 351 int on_ac_power(void);
 352
 353 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f);
 354 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f);
 355
 356 #define FOREACH_LINE(line, f, on_error)                         \
 357         for (;;)                                                \
 358                 if (!fgets(line, sizeof(line), f)) {            \
 359                         if (ferror(f)) {                        \
 360                                 on_error;                       \
 361                         }                                       \
 362                         break;                                  \
 363                 } else
 364
 365 #define FOREACH_DIRENT(de, d, on_error)                                 \
 366         for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d))   \
 367                 if (!de) {                                              \
 368                         if (errno > 0) {                                \
 369                                 on_error;                               \
 370                         }                                               \
 371                         break;                                          \
 372                 } else if (hidden_file((de)->d_name))                   \
 373                         continue;                                       \
 374                 else
 375
 376 #define FOREACH_DIRENT_ALL(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
 384
 385 static inline void *mempset(void *s, int c, size_t n) {
 386         memset(s, c, n);
 387         return (uint8_t*)s + n;
 388 }
 389
 390 void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size);
 391 void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size);
 392 #define GREEDY_REALLOC(array, allocated, need)                          \
 393         greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
 394
 395 #define GREEDY_REALLOC0(array, allocated, need)                         \
 396         greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
 397
 398 static inline void _reset_errno_(int *saved_errno) {
 399         errno = *saved_errno;
 400 }
 401
 402 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
 403
 404 static inline int negative_errno(void) {
 405         /* This helper should be used to shut up gcc if you know 'errno' is
 406          * negative. Instead of "return -errno;", use "return negative_errno();"
 407          * It will suppress bogus gcc warnings in case it assumes 'errno' might
 408          * be 0 and thus the caller's error-handling might not be triggered. */
 409         assert_return(errno > 0, -EINVAL);
 410         return -errno;
 411 }
 412
 413 struct _umask_struct_ {
 414         mode_t mask;
 415         bool quit;
 416 };
 417
 418 static inline void _reset_umask_(struct _umask_struct_ *s) {
 419         umask(s->mask);
 420 };
 421
 422 #define RUN_WITH_UMASK(mask)                                            \
 423         for (_cleanup_(_reset_umask_) struct _umask_struct_ _saved_umask_ = { umask(mask), false }; \
 424              !_saved_umask_.quit ;                                      \
 425              _saved_umask_.quit = true)
 426
 427 static inline unsigned u64log2(uint64_t n) {
 428 #if __SIZEOF_LONG_LONG__ == 8
 429         return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
 430 #else
 431 #error "Wut?"
 432 #endif
 433 }
 434
 435 static inline unsigned u32ctz(uint32_t n) {
 436 #if __SIZEOF_INT__ == 4
 437         return __builtin_ctz(n);
 438 #else
 439 #error "Wut?"
 440 #endif
 441 }
 442
 443 static inline unsigned log2i(int x) {
 444         assert(x > 0);
 445
 446         return __SIZEOF_INT__ * 8 - __builtin_clz(x) - 1;
 447 }
 448
 449 static inline unsigned log2u(unsigned x) {
 450         assert(x > 0);
 451
 452         return sizeof(unsigned) * 8 - __builtin_clz(x) - 1;
 453 }
 454
 455 static inline unsigned log2u_round_up(unsigned x) {
 456         assert(x > 0);
 457
 458         if (x == 1)
 459                 return 0;
 460
 461         return log2u(x - 1) + 1;
 462 }
 463
 464 #define DECIMAL_STR_WIDTH(x)                            \
 465         ({                                              \
 466                 typeof(x) _x_ = (x);                    \
 467                 unsigned ans = 1;                       \
 468                 while (_x_ /= 10)                       \
 469                         ans++;                          \
 470                 ans;                                    \
 471         })
 472
 473 int unlink_noerrno(const char *path);
 474
 475 #define alloca0(n)                                      \
 476         ({                                              \
 477                 char *_new_;                            \
 478                 size_t _len_ = n;                       \
 479                 _new_ = alloca(_len_);                  \
 480                 (void *) memset(_new_, 0, _len_);       \
 481         })
 482
 483 /* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
 484 #define alloca_align(size, align)                                       \
 485         ({                                                              \
 486                 void *_ptr_;                                            \
 487                 size_t _mask_ = (align) - 1;                            \
 488                 _ptr_ = alloca((size) + _mask_);                        \
 489                 (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_);         \
 490         })
 491
 492 #define alloca0_align(size, align)                                      \
 493         ({                                                              \
 494                 void *_new_;                                            \
 495                 size_t _size_ = (size);                                 \
 496                 _new_ = alloca_align(_size_, (align));                  \
 497                 (void*)memset(_new_, 0, _size_);                        \
 498         })
 499
 500 bool id128_is_valid(const char *s) _pure_;
 501
 502 int shall_restore_state(void);
 503
 504 /**
 505  * Normal qsort requires base to be nonnull. Here were require
 506  * that only if nmemb > 0.
 507  */
 508 static inline void qsort_safe(void *base, size_t nmemb, size_t size, comparison_fn_t compar) {
 509         if (nmemb <= 1)
 510                 return;
 511
 512         assert(base);
 513         qsort(base, nmemb, size, compar);
 514 }
 515
 516 int proc_cmdline(char **ret);
 517 int parse_proc_cmdline(int (*parse_word)(const char *key, const char *value));
 518 int get_proc_cmdline_key(const char *parameter, char **value);
 519
 520 int container_get_leader(const char *machine, pid_t *pid);
 521
 522 int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd);
 523 int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd);
 524
 525 int mkostemp_safe(char *pattern, int flags);
 526 int open_tmpfile(const char *path, int flags);
 527
 528 int fd_warn_permissions(const char *path, int fd);
 529
 530 #ifndef PERSONALITY_INVALID
 531 /* personality(7) documents that 0xffffffffUL is used for querying the
 532  * current personality, hence let's use that here as error
 533  * indicator. */
 534 #define PERSONALITY_INVALID 0xffffffffLU
 535 #endif
 536
 537 unsigned long personality_from_string(const char *p);
 538 const char *personality_to_string(unsigned long);
 539
 540 uint64_t physical_memory(void);
 541
 542 union file_handle_union {
 543         struct file_handle handle;
 544         char padding[sizeof(struct file_handle) + MAX_HANDLE_SZ];
 545 };
 546 #define FILE_HANDLE_INIT { .handle.handle_bytes = MAX_HANDLE_SZ }
 547
 548 int update_reboot_param_file(const char *param);
 549
 550 int umount_recursive(const char *target, int flags);
 551
 552 int bind_remount_recursive(const char *prefix, bool ro);
 553
 554 int fflush_and_check(FILE *f);
 555
 556 int tempfn_xxxxxx(const char *p, const char *extra, char **ret);
 557 int tempfn_random(const char *p, const char *extra, char **ret);
 558 int tempfn_random_child(const char *p, const char *extra, char **ret);
 559
 560 int take_password_lock(const char *root);
 561
 562 int is_symlink(const char *path);
 563 int is_dir(const char *path, bool follow);
 564 int is_device_node(const char *path);
 565
 566 #define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX + 1)
 567
 568 #define FOREACH_INOTIFY_EVENT(e, buffer, sz) \
 569         for ((e) = &buffer.ev;                                \
 570              (uint8_t*) (e) < (uint8_t*) (buffer.raw) + (sz); \
 571              (e) = (struct inotify_event*) ((uint8_t*) (e) + sizeof(struct inotify_event) + (e)->len))
 572
 573 union inotify_event_buffer {
 574         struct inotify_event ev;
 575         uint8_t raw[INOTIFY_EVENT_MAX];
 576 };
 577
 578 #define laccess(path, mode) faccessat(AT_FDCWD, (path), (mode), AT_SYMLINK_NOFOLLOW)
 579
 580 ssize_t fgetxattrat_fake(int dirfd, const char *filename, const char *attribute, void *value, size_t size, int flags);
 581
 582 int fd_setcrtime(int fd, usec_t usec);
 583 int fd_getcrtime(int fd, usec_t *usec);
 584 int path_getcrtime(const char *p, usec_t *usec);
 585 int fd_getcrtime_at(int dirfd, const char *name, usec_t *usec, int flags);
 586
 587 int chattr_fd(int fd, unsigned value, unsigned mask);
 588 int chattr_path(const char *p, unsigned value, unsigned mask);
 589
 590 int read_attr_fd(int fd, unsigned *ret);
 591 int read_attr_path(const char *p, unsigned *ret);
 592
 593 #define RLIMIT_MAKE_CONST(lim) ((struct rlimit) { lim, lim })
 594
 595 int syslog_parse_priority(const char **p, int *priority, bool with_facility);
 596
 597 int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath);
 598
 599 int mount_move_root(const char *path);
 600
 601 int getxattr_malloc(const char *path, const char *name, char **value, bool allow_symlink);
 602 int fgetxattr_malloc(int fd, const char *name, char **value);
 603
 604 int version(void);
 605
 606 bool fdname_is_valid(const char *s);
 607
 608 bool oom_score_adjust_is_valid(int oa);