1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
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.
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.
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/>.
37 #include <sys/inotify.h>
38 #include <sys/socket.h>
40 #include <sys/statfs.h>
41 #include <sys/types.h>
45 #include "formats-util.h"
48 #include "time-util.h"
50 /* What is interpreted as whitespace? */
51 #define WHITESPACE " \t\n\r"
52 #define NEWLINE "\n\r"
55 #define GLOB_CHARS "*?["
57 /* What characters are special in the shell? */
58 /* must be escaped outside and inside double-quotes */
59 #define SHELL_NEED_ESCAPE "\"\\`$"
60 /* can be escaped or double-quoted */
61 #define SHELL_NEED_QUOTES SHELL_NEED_ESCAPE GLOB_CHARS "'()<>|&;"
63 #define FORMAT_BYTES_MAX 8
65 size_t page_size(void) _pure_
;
66 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
68 #define streq(a,b) (strcmp((a),(b)) == 0)
69 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
70 #define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
71 #define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
73 bool streq_ptr(const char *a
, const char *b
) _pure_
;
74 int strcmp_ptr(const char *a
, const char *b
) _pure_
;
76 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
78 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
80 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
82 #define newa0(t, n) ((t*) alloca0(sizeof(t)*(n)))
84 #define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
86 #define malloc0(n) (calloc(1, (n)))
88 static inline void *mfree(void *memory
) {
93 static inline const char* yes_no(bool b
) {
94 return b
? "yes" : "no";
97 static inline const char* true_false(bool b
) {
98 return b
? "true" : "false";
101 static inline const char* one_zero(bool b
) {
102 return b
? "1" : "0";
105 static inline const char* strempty(const char *s
) {
109 static inline const char* strnull(const char *s
) {
110 return s
? s
: "(null)";
113 static inline const char *strna(const char *s
) {
114 return s
? s
: "n/a";
117 static inline bool isempty(const char *p
) {
121 static inline char *startswith(const char *s
, const char *prefix
) {
125 if (strncmp(s
, prefix
, l
) == 0)
126 return (char*) s
+ l
;
131 static inline char *startswith_no_case(const char *s
, const char *prefix
) {
135 if (strncasecmp(s
, prefix
, l
) == 0)
136 return (char*) s
+ l
;
141 char *endswith(const char *s
, const char *postfix
) _pure_
;
142 char *endswith_no_case(const char *s
, const char *postfix
) _pure_
;
144 char *first_word(const char *s
, const char *word
) _pure_
;
146 int close_nointr(int fd
);
147 int safe_close(int fd
);
148 void safe_close_pair(int p
[]);
150 void close_many(const int fds
[], unsigned n_fd
);
152 int fclose_nointr(FILE *f
);
153 FILE* safe_fclose(FILE *f
);
154 DIR* safe_closedir(DIR *f
);
156 int parse_size(const char *t
, uint64_t base
, uint64_t *size
);
158 int parse_boolean(const char *v
) _pure_
;
159 int parse_pid(const char *s
, pid_t
* ret_pid
);
160 int parse_uid(const char *s
, uid_t
* ret_uid
);
161 #define parse_gid(s, ret_gid) parse_uid(s, ret_gid)
163 bool uid_is_valid(uid_t uid
);
165 static inline bool gid_is_valid(gid_t gid
) {
166 return uid_is_valid((uid_t
) gid
);
169 int safe_atou(const char *s
, unsigned *ret_u
);
170 int safe_atoi(const char *s
, int *ret_i
);
172 int safe_atollu(const char *s
, unsigned long long *ret_u
);
173 int safe_atolli(const char *s
, long long int *ret_i
);
175 int safe_atod(const char *s
, double *ret_d
);
177 int safe_atou8(const char *s
, uint8_t *ret
);
179 #if LONG_MAX == INT_MAX
180 static inline int safe_atolu(const char *s
, unsigned long *ret_u
) {
181 assert_cc(sizeof(unsigned long) == sizeof(unsigned));
182 return safe_atou(s
, (unsigned*) ret_u
);
184 static inline int safe_atoli(const char *s
, long int *ret_u
) {
185 assert_cc(sizeof(long int) == sizeof(int));
186 return safe_atoi(s
, (int*) ret_u
);
189 static inline int safe_atolu(const char *s
, unsigned long *ret_u
) {
190 assert_cc(sizeof(unsigned long) == sizeof(unsigned long long));
191 return safe_atollu(s
, (unsigned long long*) ret_u
);
193 static inline int safe_atoli(const char *s
, long int *ret_u
) {
194 assert_cc(sizeof(long int) == sizeof(long long int));
195 return safe_atolli(s
, (long long int*) ret_u
);
199 static inline int safe_atou32(const char *s
, uint32_t *ret_u
) {
200 assert_cc(sizeof(uint32_t) == sizeof(unsigned));
201 return safe_atou(s
, (unsigned*) ret_u
);
204 static inline int safe_atoi32(const char *s
, int32_t *ret_i
) {
205 assert_cc(sizeof(int32_t) == sizeof(int));
206 return safe_atoi(s
, (int*) ret_i
);
209 static inline int safe_atou64(const char *s
, uint64_t *ret_u
) {
210 assert_cc(sizeof(uint64_t) == sizeof(unsigned long long));
211 return safe_atollu(s
, (unsigned long long*) ret_u
);
214 static inline int safe_atoi64(const char *s
, int64_t *ret_i
) {
215 assert_cc(sizeof(int64_t) == sizeof(long long int));
216 return safe_atolli(s
, (long long int*) ret_i
);
219 int safe_atou16(const char *s
, uint16_t *ret
);
220 int safe_atoi16(const char *s
, int16_t *ret
);
222 const char* split(const char **state
, size_t *l
, const char *separator
, bool quoted
);
224 #define FOREACH_WORD(word, length, s, state) \
225 _FOREACH_WORD(word, length, s, WHITESPACE, false, state)
227 #define FOREACH_WORD_SEPARATOR(word, length, s, separator, state) \
228 _FOREACH_WORD(word, length, s, separator, false, state)
230 #define FOREACH_WORD_QUOTED(word, length, s, state) \
231 _FOREACH_WORD(word, length, s, WHITESPACE, true, state)
233 #define _FOREACH_WORD(word, length, s, separator, quoted, state) \
234 for ((state) = (s), (word) = split(&(state), &(length), (separator), (quoted)); (word); (word) = split(&(state), &(length), (separator), (quoted)))
236 char *strappend(const char *s
, const char *suffix
);
237 char *strnappend(const char *s
, const char *suffix
, size_t length
);
239 int readlinkat_malloc(int fd
, const char *p
, char **ret
);
240 int readlink_malloc(const char *p
, char **r
);
241 int readlink_value(const char *p
, char **ret
);
242 int readlink_and_make_absolute(const char *p
, char **r
);
243 int readlink_and_canonicalize(const char *p
, char **r
);
245 char *strstrip(char *s
);
246 char *delete_chars(char *s
, const char *bad
);
247 char *truncate_nl(char *s
);
249 char *file_in_same_dir(const char *path
, const char *filename
);
251 int rmdir_parents(const char *path
, const char *stop
);
253 char hexchar(int x
) _const_
;
254 int unhexchar(char c
) _const_
;
255 char octchar(int x
) _const_
;
256 int unoctchar(char c
) _const_
;
257 char decchar(int x
) _const_
;
258 int undecchar(char c
) _const_
;
259 char base32hexchar(int x
) _const_
;
260 int unbase32hexchar(char c
) _const_
;
261 char base64char(int x
) _const_
;
262 int unbase64char(char c
) _const_
;
264 char *cescape(const char *s
);
265 size_t cescape_char(char c
, char *buf
);
267 typedef enum UnescapeFlags
{
271 int cunescape(const char *s
, UnescapeFlags flags
, char **ret
);
272 int cunescape_length(const char *s
, size_t length
, UnescapeFlags flags
, char **ret
);
273 int cunescape_length_with_prefix(const char *s
, size_t length
, const char *prefix
, UnescapeFlags flags
, char **ret
);
275 char *xescape(const char *s
, const char *bad
);
277 char *ascii_strlower(char *path
);
279 bool dirent_is_file(const struct dirent
*de
) _pure_
;
280 bool dirent_is_file_with_suffix(const struct dirent
*de
, const char *suffix
) _pure_
;
282 bool hidden_file(const char *filename
) _pure_
;
284 bool chars_intersect(const char *a
, const char *b
) _pure_
;
286 /* For basic lookup tables with strictly enumerated entries */
287 #define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope) \
288 scope const char *name##_to_string(type i) { \
289 if (i < 0 || i >= (type) ELEMENTSOF(name##_table)) \
291 return name##_table[i]; \
294 ssize_t
string_table_lookup(const char * const *table
, size_t len
, const char *key
);
296 #define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope) \
297 scope type name##_from_string(const char *s) { \
298 return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
301 #define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope) \
302 _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope) \
303 _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope) \
304 struct __useless_struct_to_allow_trailing_semicolon__
306 #define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
307 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
308 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
309 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)
311 /* For string conversions where numbers are also acceptable */
312 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max) \
313 int name##_to_string_alloc(type i, char **str) { \
315 if (i < 0 || i > max) \
317 if (i < (type) ELEMENTSOF(name##_table)) { \
318 s = strdup(name##_table[i]); \
322 if (asprintf(&s, "%i", i) < 0) \
328 type name##_from_string(const char *s) { \
333 for (i = 0; i < (type) ELEMENTSOF(name##_table); i++) \
334 if (streq_ptr(name##_table[i], s)) \
336 if (safe_atou(s, &u) >= 0 && u <= max) \
340 struct __useless_struct_to_allow_trailing_semicolon__
342 int fd_nonblock(int fd
, bool nonblock
);
343 int fd_cloexec(int fd
, bool cloexec
);
345 int close_all_fds(const int except
[], unsigned n_except
);
347 bool fstype_is_network(const char *fstype
);
349 int flush_fd(int fd
);
351 int fopen_temporary(const char *path
, FILE **_f
, char **_temp_path
);
353 ssize_t
loop_read(int fd
, void *buf
, size_t nbytes
, bool do_poll
);
354 int loop_read_exact(int fd
, void *buf
, size_t nbytes
, bool do_poll
);
355 int loop_write(int fd
, const void *buf
, size_t nbytes
, bool do_poll
);
357 bool is_device_path(const char *path
);
359 int dir_is_empty(const char *path
);
360 char* dirname_malloc(const char *path
);
362 char* lookup_uid(uid_t uid
);
363 char* getlogname_malloc(void);
364 char* getusername_malloc(void);
366 int chmod_and_chown(const char *path
, mode_t mode
, uid_t uid
, gid_t gid
);
367 int fchmod_and_fchown(int fd
, mode_t mode
, uid_t uid
, gid_t gid
);
369 bool is_temporary_fs(const struct statfs
*s
) _pure_
;
370 int fd_is_temporary_fs(int fd
);
372 int pipe_eof(int fd
);
374 DEFINE_TRIVIAL_CLEANUP_FUNC(cpu_set_t
*, CPU_FREE
);
375 #define _cleanup_cpu_free_ _cleanup_(CPU_FREEp)
377 cpu_set_t
* cpu_set_malloc(unsigned *ncpus
);
379 #define xsprintf(buf, fmt, ...) \
380 assert_message_se((size_t) snprintf(buf, ELEMENTSOF(buf), fmt, __VA_ARGS__) < ELEMENTSOF(buf), \
381 "xsprintf: " #buf "[] must be big enough")
383 int files_same(const char *filea
, const char *fileb
);
385 int running_in_chroot(void);
387 char *ellipsize(const char *s
, size_t length
, unsigned percent
);
389 char *ellipsize_mem(const char *s
, size_t old_length
, size_t new_length
, unsigned percent
);
391 int touch_file(const char *path
, bool parents
, usec_t stamp
, uid_t uid
, gid_t gid
, mode_t mode
);
392 int touch(const char *path
);
394 noreturn
void freeze(void);
396 bool null_or_empty(struct stat
*st
) _pure_
;
397 int null_or_empty_path(const char *fn
);
398 int null_or_empty_fd(int fd
);
400 DIR *xopendirat(int dirfd
, const char *name
, int flags
);
402 char *fstab_node_to_udev_node(const char *p
);
404 void execute_directories(const char* const* directories
, usec_t timeout
, char *argv
[]);
406 bool nulstr_contains(const char*nulstr
, const char *needle
);
408 bool plymouth_running(void);
410 char* strshorten(char *s
, size_t l
);
412 int symlink_idempotent(const char *from
, const char *to
);
414 int symlink_atomic(const char *from
, const char *to
);
415 int mknod_atomic(const char *path
, mode_t mode
, dev_t dev
);
416 int mkfifo_atomic(const char *path
, mode_t mode
);
418 int fchmod_umask(int fd
, mode_t mode
);
420 bool display_is_local(const char *display
) _pure_
;
421 int socket_from_display(const char *display
, char **path
);
423 int get_user_creds(const char **username
, uid_t
*uid
, gid_t
*gid
, const char **home
, const char **shell
);
424 int get_group_creds(const char **groupname
, gid_t
*gid
);
426 int in_gid(gid_t gid
);
427 int in_group(const char *name
);
429 char* uid_to_name(uid_t uid
);
430 char* gid_to_name(gid_t gid
);
432 int glob_exists(const char *path
);
433 int glob_extend(char ***strv
, const char *path
);
435 int dirent_ensure_type(DIR *d
, struct dirent
*de
);
437 int get_files_in_directory(const char *path
, char ***list
);
439 char *strjoin(const char *x
, ...) _sentinel_
;
441 bool is_main_thread(void);
443 static inline bool _pure_
in_charset(const char *s
, const char* charset
) {
446 return s
[strspn(s
, charset
)] == '\0';
449 int block_get_whole_disk(dev_t d
, dev_t
*ret
);
451 #define NULSTR_FOREACH(i, l) \
452 for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
454 #define NULSTR_FOREACH_PAIR(i, j, l) \
455 for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
457 int ioprio_class_to_string_alloc(int i
, char **s
);
458 int ioprio_class_from_string(const char *s
);
460 const char *sigchld_code_to_string(int i
) _const_
;
461 int sigchld_code_from_string(const char *s
) _pure_
;
463 int log_facility_unshifted_to_string_alloc(int i
, char **s
);
464 int log_facility_unshifted_from_string(const char *s
);
466 int log_level_to_string_alloc(int i
, char **s
);
467 int log_level_from_string(const char *s
);
469 int sched_policy_to_string_alloc(int i
, char **s
);
470 int sched_policy_from_string(const char *s
);
472 const char *rlimit_to_string(int i
) _const_
;
473 int rlimit_from_string(const char *s
) _pure_
;
475 int ip_tos_to_string_alloc(int i
, char **s
);
476 int ip_tos_from_string(const char *s
);
478 extern int saved_argc
;
479 extern char **saved_argv
;
481 bool kexec_loaded(void);
483 int prot_from_flags(int flags
) _const_
;
485 char *format_bytes(char *buf
, size_t l
, uint64_t t
);
487 int fd_wait_for_event(int fd
, int event
, usec_t timeout
);
489 void* memdup(const void *p
, size_t l
) _alloc_(2);
491 int fd_inc_sndbuf(int fd
, size_t n
);
492 int fd_inc_rcvbuf(int fd
, size_t n
);
494 int fork_agent(pid_t
*pid
, const int except
[], unsigned n_except
, const char *path
, ...);
496 int setrlimit_closest(int resource
, const struct rlimit
*rlim
);
498 bool http_url_is_valid(const char *url
) _pure_
;
499 bool documentation_url_is_valid(const char *url
) _pure_
;
501 bool http_etag_is_valid(const char *etag
);
503 bool in_initrd(void);
505 int get_home_dir(char **ret
);
506 int get_shell(char **_ret
);
508 static inline void freep(void *p
) {
512 static inline void closep(int *fd
) {
516 static inline void umaskp(mode_t
*u
) {
520 static inline void close_pairp(int (*p
)[2]) {
524 static inline void fclosep(FILE **f
) {
528 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, pclose
);
529 DEFINE_TRIVIAL_CLEANUP_FUNC(DIR*, closedir
);
530 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent
);
532 #define _cleanup_free_ _cleanup_(freep)
533 #define _cleanup_close_ _cleanup_(closep)
534 #define _cleanup_umask_ _cleanup_(umaskp)
535 #define _cleanup_globfree_ _cleanup_(globfree)
536 #define _cleanup_fclose_ _cleanup_(fclosep)
537 #define _cleanup_pclose_ _cleanup_(pclosep)
538 #define _cleanup_closedir_ _cleanup_(closedirp)
539 #define _cleanup_endmntent_ _cleanup_(endmntentp)
540 #define _cleanup_close_pair_ _cleanup_(close_pairp)
542 _malloc_
_alloc_(1, 2) static inline void *malloc_multiply(size_t a
, size_t b
) {
543 if (_unlikely_(b
!= 0 && a
> ((size_t) -1) / b
))
546 return malloc(a
* b
);
549 _alloc_(2, 3) static inline void *realloc_multiply(void *p
, size_t a
, size_t b
) {
550 if (_unlikely_(b
!= 0 && a
> ((size_t) -1) / b
))
553 return realloc(p
, a
* b
);
556 _alloc_(2, 3) static inline void *memdup_multiply(const void *p
, size_t a
, size_t b
) {
557 if (_unlikely_(b
!= 0 && a
> ((size_t) -1) / b
))
560 return memdup(p
, a
* b
);
563 bool filename_is_valid(const char *p
) _pure_
;
564 bool path_is_safe(const char *p
) _pure_
;
565 bool string_is_safe(const char *p
) _pure_
;
566 bool string_has_cc(const char *p
, const char *ok
) _pure_
;
569 * Check if a string contains any glob patterns.
571 _pure_
static inline bool string_is_glob(const char *p
) {
572 return !!strpbrk(p
, GLOB_CHARS
);
575 void *xbsearch_r(const void *key
, const void *base
, size_t nmemb
, size_t size
,
576 int (*compar
) (const void *, const void *, void *),
579 #define _(String) gettext (String)
580 #define N_(String) String
581 void init_gettext(void);
582 bool is_locale_utf8(void);
584 typedef enum DrawSpecialChar
{
589 DRAW_TRIANGULAR_BULLET
,
593 _DRAW_SPECIAL_CHAR_MAX
596 const char *draw_special_char(DrawSpecialChar ch
);
598 char *strreplace(const char *text
, const char *old_string
, const char *new_string
);
600 char *strip_tab_ansi(char **p
, size_t *l
);
602 int on_ac_power(void);
604 int search_and_fopen(const char *path
, const char *mode
, const char *root
, const char **search
, FILE **_f
);
605 int search_and_fopen_nulstr(const char *path
, const char *mode
, const char *root
, const char *search
, FILE **_f
);
607 #define FOREACH_LINE(line, f, on_error) \
609 if (!fgets(line, sizeof(line), f)) { \
616 #define FOREACH_DIRENT(de, d, on_error) \
617 for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d)) \
623 } else if (hidden_file((de)->d_name)) \
627 #define FOREACH_DIRENT_ALL(de, d, on_error) \
628 for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d)) \
636 static inline void *mempset(void *s
, int c
, size_t n
) {
638 return (uint8_t*)s
+ n
;
641 char *hexmem(const void *p
, size_t l
);
642 int unhexmem(const char *p
, size_t l
, void **mem
, size_t *len
);
644 char *base32hexmem(const void *p
, size_t l
, bool padding
);
645 int unbase32hexmem(const char *p
, size_t l
, bool padding
, void **mem
, size_t *len
);
647 char *base64mem(const void *p
, size_t l
);
648 int unbase64mem(const char *p
, size_t l
, void **mem
, size_t *len
);
650 char *strextend(char **x
, ...) _sentinel_
;
651 char *strrep(const char *s
, unsigned n
);
653 void* greedy_realloc(void **p
, size_t *allocated
, size_t need
, size_t size
);
654 void* greedy_realloc0(void **p
, size_t *allocated
, size_t need
, size_t size
);
655 #define GREEDY_REALLOC(array, allocated, need) \
656 greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
658 #define GREEDY_REALLOC0(array, allocated, need) \
659 greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
661 static inline void _reset_errno_(int *saved_errno
) {
662 errno
= *saved_errno
;
665 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
667 static inline int negative_errno(void) {
668 /* This helper should be used to shut up gcc if you know 'errno' is
669 * negative. Instead of "return -errno;", use "return negative_errno();"
670 * It will suppress bogus gcc warnings in case it assumes 'errno' might
671 * be 0 and thus the caller's error-handling might not be triggered. */
672 assert_return(errno
> 0, -EINVAL
);
676 struct _umask_struct_
{
681 static inline void _reset_umask_(struct _umask_struct_
*s
) {
685 #define RUN_WITH_UMASK(mask) \
686 for (_cleanup_(_reset_umask_) struct _umask_struct_ _saved_umask_ = { umask(mask), false }; \
687 !_saved_umask_.quit ; \
688 _saved_umask_.quit = true)
690 static inline unsigned u64log2(uint64_t n
) {
691 #if __SIZEOF_LONG_LONG__ == 8
692 return (n
> 1) ? (unsigned) __builtin_clzll(n
) ^ 63U : 0;
698 static inline unsigned u32ctz(uint32_t n
) {
699 #if __SIZEOF_INT__ == 4
700 return __builtin_ctz(n
);
706 static inline unsigned log2i(int x
) {
709 return __SIZEOF_INT__
* 8 - __builtin_clz(x
) - 1;
712 static inline unsigned log2u(unsigned x
) {
715 return sizeof(unsigned) * 8 - __builtin_clz(x
) - 1;
718 static inline unsigned log2u_round_up(unsigned x
) {
724 return log2u(x
- 1) + 1;
727 static inline bool logind_running(void) {
728 return access("/run/systemd/seats/", F_OK
) >= 0;
731 #define DECIMAL_STR_WIDTH(x) \
733 typeof(x) _x_ = (x); \
740 int unlink_noerrno(const char *path
);
746 _new_ = alloca(_len_); \
747 (void *) memset(_new_, 0, _len_); \
750 /* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
751 #define alloca_align(size, align) \
754 size_t _mask_ = (align) - 1; \
755 _ptr_ = alloca((size) + _mask_); \
756 (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_); \
759 #define alloca0_align(size, align) \
762 size_t _size_ = (size); \
763 _new_ = alloca_align(_size_, (align)); \
764 (void*)memset(_new_, 0, _size_); \
767 #define strjoina(a, ...) \
769 const char *_appendees_[] = { a, __VA_ARGS__ }; \
773 for (_i_ = 0; _i_ < ELEMENTSOF(_appendees_) && _appendees_[_i_]; _i_++) \
774 _len_ += strlen(_appendees_[_i_]); \
775 _p_ = _d_ = alloca(_len_ + 1); \
776 for (_i_ = 0; _i_ < ELEMENTSOF(_appendees_) && _appendees_[_i_]; _i_++) \
777 _p_ = stpcpy(_p_, _appendees_[_i_]); \
782 bool id128_is_valid(const char *s
) _pure_
;
784 int split_pair(const char *s
, const char *sep
, char **l
, char **r
);
786 int shall_restore_state(void);
789 * Normal qsort requires base to be nonnull. Here were require
790 * that only if nmemb > 0.
792 static inline void qsort_safe(void *base
, size_t nmemb
, size_t size
, comparison_fn_t compar
) {
797 qsort(base
, nmemb
, size
, compar
);
800 /* Normal memmem() requires haystack to be nonnull, which is annoying for zero-length buffers */
801 static inline void *memmem_safe(const void *haystack
, size_t haystacklen
, const void *needle
, size_t needlelen
) {
804 return (void*) haystack
;
806 if (haystacklen
< needlelen
)
812 return memmem(haystack
, haystacklen
, needle
, needlelen
);
815 int proc_cmdline(char **ret
);
816 int parse_proc_cmdline(int (*parse_word
)(const char *key
, const char *value
));
817 int get_proc_cmdline_key(const char *parameter
, char **value
);
819 int container_get_leader(const char *machine
, pid_t
*pid
);
821 int namespace_open(pid_t pid
, int *pidns_fd
, int *mntns_fd
, int *netns_fd
, int *userns_fd
, int *root_fd
);
822 int namespace_enter(int pidns_fd
, int mntns_fd
, int netns_fd
, int userns_fd
, int root_fd
);
824 int getpeercred(int fd
, struct ucred
*ucred
);
825 int getpeersec(int fd
, char **ret
);
827 int writev_safe(int fd
, const struct iovec
*w
, int j
);
829 int mkostemp_safe(char *pattern
, int flags
);
830 int open_tmpfile(const char *path
, int flags
);
832 int fd_warn_permissions(const char *path
, int fd
);
834 #ifndef PERSONALITY_INVALID
835 /* personality(7) documents that 0xffffffffUL is used for querying the
836 * current personality, hence let's use that here as error
838 #define PERSONALITY_INVALID 0xffffffffLU
841 unsigned long personality_from_string(const char *p
);
842 const char *personality_to_string(unsigned long);
844 uint64_t physical_memory(void);
846 void hexdump(FILE *f
, const void *p
, size_t s
);
848 union file_handle_union
{
849 struct file_handle handle
;
850 char padding
[sizeof(struct file_handle
) + MAX_HANDLE_SZ
];
852 #define FILE_HANDLE_INIT { .handle.handle_bytes = MAX_HANDLE_SZ }
854 int update_reboot_param_file(const char *param
);
856 int umount_recursive(const char *target
, int flags
);
858 int bind_remount_recursive(const char *prefix
, bool ro
);
860 int fflush_and_check(FILE *f
);
862 int tempfn_xxxxxx(const char *p
, const char *extra
, char **ret
);
863 int tempfn_random(const char *p
, const char *extra
, char **ret
);
864 int tempfn_random_child(const char *p
, const char *extra
, char **ret
);
866 int take_password_lock(const char *root
);
868 int is_symlink(const char *path
);
869 int is_dir(const char *path
, bool follow
);
870 int is_device_node(const char *path
);
872 typedef enum ExtractFlags
{
874 EXTRACT_CUNESCAPE
= 2,
875 EXTRACT_CUNESCAPE_RELAX
= 4,
877 EXTRACT_DONT_COALESCE_SEPARATORS
= 16,
880 int extract_first_word(const char **p
, char **ret
, const char *separators
, ExtractFlags flags
);
881 int extract_first_word_and_warn(const char **p
, char **ret
, const char *separators
, ExtractFlags flags
, const char *unit
, const char *filename
, unsigned line
, const char *rvalue
);
882 int extract_many_words(const char **p
, const char *separators
, ExtractFlags flags
, ...) _sentinel_
;
884 int free_and_strdup(char **p
, const char *s
);
886 #define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX + 1)
888 #define FOREACH_INOTIFY_EVENT(e, buffer, sz) \
889 for ((e) = &buffer.ev; \
890 (uint8_t*) (e) < (uint8_t*) (buffer.raw) + (sz); \
891 (e) = (struct inotify_event*) ((uint8_t*) (e) + sizeof(struct inotify_event) + (e)->len))
893 union inotify_event_buffer
{
894 struct inotify_event ev
;
895 uint8_t raw
[INOTIFY_EVENT_MAX
];
898 #define laccess(path, mode) faccessat(AT_FDCWD, (path), (mode), AT_SYMLINK_NOFOLLOW)
900 int ptsname_malloc(int fd
, char **ret
);
902 int openpt_in_namespace(pid_t pid
, int flags
);
904 ssize_t
fgetxattrat_fake(int dirfd
, const char *filename
, const char *attribute
, void *value
, size_t size
, int flags
);
906 int fd_setcrtime(int fd
, usec_t usec
);
907 int fd_getcrtime(int fd
, usec_t
*usec
);
908 int path_getcrtime(const char *p
, usec_t
*usec
);
909 int fd_getcrtime_at(int dirfd
, const char *name
, usec_t
*usec
, int flags
);
911 int same_fd(int a
, int b
);
913 int chattr_fd(int fd
, unsigned value
, unsigned mask
);
914 int chattr_path(const char *p
, unsigned value
, unsigned mask
);
916 int read_attr_fd(int fd
, unsigned *ret
);
917 int read_attr_path(const char *p
, unsigned *ret
);
919 #define RLIMIT_MAKE_CONST(lim) ((struct rlimit) { lim, lim })
921 ssize_t
sparse_write(int fd
, const void *p
, size_t sz
, size_t run_length
);
923 void sigkill_wait(pid_t
*pid
);
924 #define _cleanup_sigkill_wait_ _cleanup_(sigkill_wait)
926 int syslog_parse_priority(const char **p
, int *priority
, bool with_facility
);
928 void cmsg_close_all(struct msghdr
*mh
);
930 int rename_noreplace(int olddirfd
, const char *oldpath
, int newdirfd
, const char *newpath
);
932 char *shell_escape(const char *s
, const char *bad
);
933 char *shell_maybe_quote(const char *s
);
935 int parse_mode(const char *s
, mode_t
*ret
);
937 int mount_move_root(const char *path
);
939 int reset_uid_gid(void);
941 int getxattr_malloc(const char *path
, const char *name
, char **value
, bool allow_symlink
);
942 int fgetxattr_malloc(int fd
, const char *name
, char **value
);
944 int send_one_fd(int transport_fd
, int fd
);
945 int receive_one_fd(int transport_fd
);