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/>.
36 #include <sys/types.h>
39 #include <sys/resource.h>
44 #include <sys/socket.h>
47 # define PID_FMT "%" PRIu32
48 #elif SIZEOF_PID_T == 2
49 # define PID_FMT "%" PRIu16
51 # error Unknown pid_t size
55 # define UID_FMT "%" PRIu32
56 #elif SIZEOF_UID_T == 2
57 # define UID_FMT "%" PRIu16
59 # error Unknown uid_t size
63 # define GID_FMT "%" PRIu32
64 #elif SIZEOF_GID_T == 2
65 # define GID_FMT "%" PRIu16
67 # error Unknown gid_t size
70 #if SIZEOF_TIME_T == 8
71 # define PRI_TIME PRIu64
72 #elif SIZEOF_TIME_T == 4
73 # define PRI_TIME PRIu32
75 # error Unknown time_t size
78 #if SIZEOF_RLIM_T == 8
79 # define RLIM_FMT "%" PRIu64
80 #elif SIZEOF_RLIM_T == 4
81 # define RLIM_FMT "%" PRIu32
83 # error Unknown rlim_t size
88 #include "time-util.h"
90 /* What is interpreted as whitespace? */
91 #define WHITESPACE " \t\n\r"
92 #define NEWLINE "\n\r"
95 #define GLOB_CHARS "*?["
97 /* What characters are special in the shell? */
98 /* must be escaped outside and inside double-quotes */
99 #define SHELL_NEED_ESCAPE "\"\\`$"
100 /* can be escaped or double-quoted */
101 #define SHELL_NEED_QUOTES SHELL_NEED_ESCAPE GLOB_CHARS "'()<>|&;"
103 #define FORMAT_BYTES_MAX 8
105 #define ANSI_HIGHLIGHT_ON "\x1B[1;39m"
106 #define ANSI_RED_ON "\x1B[31m"
107 #define ANSI_HIGHLIGHT_RED_ON "\x1B[1;31m"
108 #define ANSI_GREEN_ON "\x1B[32m"
109 #define ANSI_HIGHLIGHT_GREEN_ON "\x1B[1;32m"
110 #define ANSI_HIGHLIGHT_YELLOW_ON "\x1B[1;33m"
111 #define ANSI_HIGHLIGHT_BLUE_ON "\x1B[1;34m"
112 #define ANSI_HIGHLIGHT_OFF "\x1B[0m"
113 #define ANSI_ERASE_TO_END_OF_LINE "\x1B[K"
115 size_t page_size(void);
116 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
118 #define streq(a,b) (strcmp((a),(b)) == 0)
119 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
120 #define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
121 #define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
123 bool streq_ptr(const char *a, const char *b) _pure_;
125 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
127 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
129 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
131 #define newa0(t, n) ((t*) alloca0(sizeof(t)*(n)))
133 #define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
135 #define malloc0(n) (calloc((n), 1))
137 static inline const char* yes_no(bool b) {
138 return b ? "yes" : "no";
141 static inline const char* true_false(bool b) {
142 return b ? "true" : "false";
145 static inline const char* strempty(const char *s) {
149 static inline const char* strnull(const char *s) {
150 return s ? s : "(null)";
153 static inline const char *strna(const char *s) {
154 return s ? s : "n/a";
157 static inline bool isempty(const char *p) {
161 static inline char *startswith(const char *s, const char *prefix) {
165 if (strncmp(s, prefix, l) == 0)
166 return (char*) s + l;
171 static inline char *startswith_no_case(const char *s, const char *prefix) {
175 if (strncasecmp(s, prefix, l) == 0)
176 return (char*) s + l;
181 char *endswith(const char *s, const char *postfix) _pure_;
183 char *first_word(const char *s, const char *word) _pure_;
185 int close_nointr(int fd);
186 int safe_close(int fd);
187 void safe_close_pair(int p[]);
189 void close_many(const int fds[], unsigned n_fd);
191 int parse_size(const char *t, off_t base, off_t *size);
193 int parse_boolean(const char *v) _pure_;
194 int parse_pid(const char *s, pid_t* ret_pid);
195 int parse_uid(const char *s, uid_t* ret_uid);
196 #define parse_gid(s, ret_uid) parse_uid(s, ret_uid)
198 int safe_atou(const char *s, unsigned *ret_u);
199 int safe_atoi(const char *s, int *ret_i);
201 int safe_atollu(const char *s, unsigned long long *ret_u);
202 int safe_atolli(const char *s, long long int *ret_i);
204 int safe_atod(const char *s, double *ret_d);
206 int safe_atou8(const char *s, uint8_t *ret);
208 #if LONG_MAX == INT_MAX
209 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
210 assert_cc(sizeof(unsigned long) == sizeof(unsigned));
211 return safe_atou(s, (unsigned*) ret_u);
213 static inline int safe_atoli(const char *s, long int *ret_u) {
214 assert_cc(sizeof(long int) == sizeof(int));
215 return safe_atoi(s, (int*) ret_u);
218 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
219 assert_cc(sizeof(unsigned long) == sizeof(unsigned long long));
220 return safe_atollu(s, (unsigned long long*) ret_u);
222 static inline int safe_atoli(const char *s, long int *ret_u) {
223 assert_cc(sizeof(long int) == sizeof(long long int));
224 return safe_atolli(s, (long long int*) ret_u);
228 static inline int safe_atou32(const char *s, uint32_t *ret_u) {
229 assert_cc(sizeof(uint32_t) == sizeof(unsigned));
230 return safe_atou(s, (unsigned*) ret_u);
233 static inline int safe_atoi32(const char *s, int32_t *ret_i) {
234 assert_cc(sizeof(int32_t) == sizeof(int));
235 return safe_atoi(s, (int*) ret_i);
238 static inline int safe_atou64(const char *s, uint64_t *ret_u) {
239 assert_cc(sizeof(uint64_t) == sizeof(unsigned long long));
240 return safe_atollu(s, (unsigned long long*) ret_u);
243 static inline int safe_atoi64(const char *s, int64_t *ret_i) {
244 assert_cc(sizeof(int64_t) == sizeof(long long int));
245 return safe_atolli(s, (long long int*) ret_i);
248 int safe_atou16(const char *s, uint16_t *ret);
249 int safe_atoi16(const char *s, int16_t *ret);
251 const char* split(const char **state, size_t *l, const char *separator, bool quoted);
253 #define FOREACH_WORD(word, length, s, state) \
254 _FOREACH_WORD(word, length, s, WHITESPACE, false, state)
256 #define FOREACH_WORD_SEPARATOR(word, length, s, separator, state) \
257 _FOREACH_WORD(word, length, s, separator, false, state)
259 #define FOREACH_WORD_QUOTED(word, length, s, state) \
260 _FOREACH_WORD(word, length, s, WHITESPACE, true, state)
262 #define _FOREACH_WORD(word, length, s, separator, quoted, state) \
263 for ((state) = (s), (word) = split(&(state), &(length), (separator), (quoted)); (word); (word) = split(&(state), &(length), (separator), (quoted)))
265 pid_t get_parent_of_pid(pid_t pid, pid_t *ppid);
266 int get_starttime_of_pid(pid_t pid, unsigned long long *st);
268 char *strappend(const char *s, const char *suffix);
269 char *strnappend(const char *s, const char *suffix, size_t length);
271 char *replace_env(const char *format, char **env);
272 char **replace_env_argv(char **argv, char **env);
274 int readlinkat_malloc(int fd, const char *p, char **ret);
275 int readlink_malloc(const char *p, char **r);
276 int readlink_value(const char *p, char **ret);
277 int readlink_and_make_absolute(const char *p, char **r);
278 int readlink_and_canonicalize(const char *p, char **r);
280 int reset_all_signal_handlers(void);
281 int reset_signal_mask(void);
283 char *strstrip(char *s);
284 char *delete_chars(char *s, const char *bad);
285 char *truncate_nl(char *s);
287 char *file_in_same_dir(const char *path, const char *filename);
289 int rmdir_parents(const char *path, const char *stop);
291 int get_process_state(pid_t pid);
292 int get_process_comm(pid_t pid, char **name);
293 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line);
294 int get_process_exe(pid_t pid, char **name);
295 int get_process_uid(pid_t pid, uid_t *uid);
296 int get_process_gid(pid_t pid, gid_t *gid);
297 int get_process_capeff(pid_t pid, char **capeff);
299 char hexchar(int x) _const_;
300 int unhexchar(char c) _const_;
301 char octchar(int x) _const_;
302 int unoctchar(char c) _const_;
303 char decchar(int x) _const_;
304 int undecchar(char c) _const_;
306 char *cescape(const char *s);
307 char *cunescape(const char *s);
308 char *cunescape_length(const char *s, size_t length);
309 char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix);
311 char *xescape(const char *s, const char *bad);
313 char *ascii_strlower(char *path);
315 bool dirent_is_file(const struct dirent *de) _pure_;
316 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
318 bool ignore_file(const char *filename) _pure_;
320 bool chars_intersect(const char *a, const char *b) _pure_;
322 int make_stdio(int fd);
323 int make_null_stdio(void);
324 int make_console_stdio(void);
326 int dev_urandom(void *p, size_t n);
327 void random_bytes(void *p, size_t n);
328 void initialize_srand(void);
330 static inline uint64_t random_u64(void) {
332 random_bytes(&u, sizeof(u));
336 static inline uint32_t random_u32(void) {
338 random_bytes(&u, sizeof(u));
342 /* For basic lookup tables with strictly enumerated entries */
343 #define __DEFINE_STRING_TABLE_LOOKUP(name,type,scope) \
344 scope const char *name##_to_string(type i) { \
345 if (i < 0 || i >= (type) ELEMENTSOF(name##_table)) \
347 return name##_table[i]; \
349 scope type name##_from_string(const char *s) { \
353 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++) \
354 if (name##_table[i] && \
355 streq(name##_table[i], s)) \
359 struct __useless_struct_to_allow_trailing_semicolon__
361 #define DEFINE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,)
362 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,static)
364 /* For string conversions where numbers are also acceptable */
365 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max) \
366 int name##_to_string_alloc(type i, char **str) { \
369 if (i < 0 || i > max) \
371 if (i < (type) ELEMENTSOF(name##_table)) { \
372 s = strdup(name##_table[i]); \
376 r = asprintf(&s, "%u", i); \
383 type name##_from_string(const char *s) { \
387 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++) \
388 if (name##_table[i] && \
389 streq(name##_table[i], s)) \
391 if (safe_atou(s, &u) >= 0 && u <= max) \
395 struct __useless_struct_to_allow_trailing_semicolon__
397 int fd_nonblock(int fd, bool nonblock);
398 int fd_cloexec(int fd, bool cloexec);
400 int close_all_fds(const int except[], unsigned n_except);
402 bool fstype_is_network(const char *fstype);
406 int read_one_char(FILE *f, char *ret, usec_t timeout, bool *need_nl);
407 int ask_char(char *ret, const char *replies, const char *text, ...) _printf_(3, 4);
408 int ask_string(char **ret, const char *text, ...) _printf_(2, 3);
410 int reset_terminal_fd(int fd, bool switch_to_text);
411 int reset_terminal(const char *name);
413 int open_terminal(const char *name, int mode);
414 int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm, usec_t timeout);
415 int release_terminal(void);
417 int flush_fd(int fd);
419 int ignore_signals(int sig, ...);
420 int default_signals(int sig, ...);
421 int sigaction_many(const struct sigaction *sa, ...);
423 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
425 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll);
426 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll);
428 bool is_device_path(const char *path);
430 int dir_is_empty(const char *path);
431 char* dirname_malloc(const char *path);
433 void rename_process(const char name[8]);
435 void sigset_add_many(sigset_t *ss, ...);
436 int sigprocmask_many(int how, ...);
438 bool hostname_is_set(void);
440 char* lookup_uid(uid_t uid);
441 char* gethostname_malloc(void);
442 char* getlogname_malloc(void);
443 char* getusername_malloc(void);
445 int getttyname_malloc(int fd, char **r);
446 int getttyname_harder(int fd, char **r);
448 int get_ctty_devnr(pid_t pid, dev_t *d);
449 int get_ctty(pid_t, dev_t *_devnr, char **r);
451 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
452 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
454 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
455 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
456 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
457 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
459 int pipe_eof(int fd);
461 cpu_set_t* cpu_set_malloc(unsigned *ncpus);
463 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) _printf_(4,0);
464 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) _printf_(4,5);
466 int fd_columns(int fd);
467 unsigned columns(void);
468 int fd_lines(int fd);
469 unsigned lines(void);
470 void columns_lines_cache_reset(int _unused_ signum);
474 static inline const char *ansi_highlight(void) {
475 return on_tty() ? ANSI_HIGHLIGHT_ON : "";
478 static inline const char *ansi_highlight_red(void) {
479 return on_tty() ? ANSI_HIGHLIGHT_RED_ON : "";
482 static inline const char *ansi_highlight_green(void) {
483 return on_tty() ? ANSI_HIGHLIGHT_GREEN_ON : "";
486 static inline const char *ansi_highlight_yellow(void) {
487 return on_tty() ? ANSI_HIGHLIGHT_YELLOW_ON : "";
490 static inline const char *ansi_highlight_blue(void) {
491 return on_tty() ? ANSI_HIGHLIGHT_BLUE_ON : "";
494 static inline const char *ansi_highlight_off(void) {
495 return on_tty() ? ANSI_HIGHLIGHT_OFF : "";
498 int files_same(const char *filea, const char *fileb);
500 int running_in_chroot(void);
502 char *ellipsize(const char *s, size_t length, unsigned percent);
504 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent);
506 int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode);
507 int touch(const char *path);
509 char *unquote(const char *s, const char *quotes);
510 char *normalize_env_assignment(const char *s);
512 int wait_for_terminate(pid_t pid, siginfo_t *status);
513 int wait_for_terminate_and_warn(const char *name, pid_t pid);
515 noreturn void freeze(void);
517 bool null_or_empty(struct stat *st) _pure_;
518 int null_or_empty_path(const char *fn);
519 int null_or_empty_fd(int fd);
521 DIR *xopendirat(int dirfd, const char *name, int flags);
523 char *fstab_node_to_udev_node(const char *p);
525 char *resolve_dev_console(char **active);
526 bool tty_is_vc(const char *tty);
527 bool tty_is_vc_resolve(const char *tty);
528 bool tty_is_console(const char *tty) _pure_;
529 int vtnr_from_tty(const char *tty);
530 const char *default_term_for_tty(const char *tty);
532 void execute_directory(const char *directory, DIR *_d, usec_t timeout, char *argv[]);
534 int kill_and_sigcont(pid_t pid, int sig);
536 bool nulstr_contains(const char*nulstr, const char *needle);
538 bool plymouth_running(void);
540 bool hostname_is_valid(const char *s) _pure_;
541 char* hostname_cleanup(char *s, bool lowercase);
543 bool machine_name_is_valid(const char *s) _pure_;
545 char* strshorten(char *s, size_t l);
547 int terminal_vhangup_fd(int fd);
548 int terminal_vhangup(const char *name);
550 int vt_disallocate(const char *name);
552 int symlink_atomic(const char *from, const char *to);
553 int mknod_atomic(const char *path, mode_t mode, dev_t dev);
554 int mkfifo_atomic(const char *path, mode_t mode);
556 int fchmod_umask(int fd, mode_t mode);
558 bool display_is_local(const char *display) _pure_;
559 int socket_from_display(const char *display, char **path);
561 int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell);
562 int get_group_creds(const char **groupname, gid_t *gid);
564 int in_gid(gid_t gid);
565 int in_group(const char *name);
567 char* uid_to_name(uid_t uid);
568 char* gid_to_name(gid_t gid);
570 int glob_exists(const char *path);
571 int glob_extend(char ***strv, const char *path);
573 int dirent_ensure_type(DIR *d, struct dirent *de);
575 int get_files_in_directory(const char *path, char ***list);
577 char *strjoin(const char *x, ...) _sentinel_;
579 bool is_main_thread(void);
581 static inline bool _pure_ in_charset(const char *s, const char* charset) {
584 return s[strspn(s, charset)] == '\0';
587 int block_get_whole_disk(dev_t d, dev_t *ret);
589 #define NULSTR_FOREACH(i, l) \
590 for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
592 #define NULSTR_FOREACH_PAIR(i, j, l) \
593 for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
595 int ioprio_class_to_string_alloc(int i, char **s);
596 int ioprio_class_from_string(const char *s);
598 const char *sigchld_code_to_string(int i) _const_;
599 int sigchld_code_from_string(const char *s) _pure_;
601 int log_facility_unshifted_to_string_alloc(int i, char **s);
602 int log_facility_unshifted_from_string(const char *s);
604 int log_level_to_string_alloc(int i, char **s);
605 int log_level_from_string(const char *s);
607 int sched_policy_to_string_alloc(int i, char **s);
608 int sched_policy_from_string(const char *s);
610 const char *rlimit_to_string(int i) _const_;
611 int rlimit_from_string(const char *s) _pure_;
613 int ip_tos_to_string_alloc(int i, char **s);
614 int ip_tos_from_string(const char *s);
616 const char *signal_to_string(int i) _const_;
617 int signal_from_string(const char *s) _pure_;
619 int signal_from_string_try_harder(const char *s);
621 extern int saved_argc;
622 extern char **saved_argv;
624 bool kexec_loaded(void);
626 int prot_from_flags(int flags) _const_;
628 char *format_bytes(char *buf, size_t l, off_t t);
630 int fd_wait_for_event(int fd, int event, usec_t timeout);
632 void* memdup(const void *p, size_t l) _alloc_(2);
634 int is_kernel_thread(pid_t pid);
636 int fd_inc_sndbuf(int fd, size_t n);
637 int fd_inc_rcvbuf(int fd, size_t n);
639 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
641 int setrlimit_closest(int resource, const struct rlimit *rlim);
643 int getenv_for_pid(pid_t pid, const char *field, char **_value);
645 bool is_valid_documentation_url(const char *url) _pure_;
647 bool in_initrd(void);
649 void warn_melody(void);
651 int get_home_dir(char **ret);
652 int get_shell(char **_ret);
654 static inline void freep(void *p) {
658 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
659 static inline void func##p(type *p) { \
663 struct __useless_struct_to_allow_trailing_semicolon__
665 static inline void closep(int *fd) {
669 static inline void umaskp(mode_t *u) {
673 static inline void close_pairp(int (*p)[2]) {
677 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, fclose);
678 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, pclose);
679 DEFINE_TRIVIAL_CLEANUP_FUNC(DIR*, closedir);
680 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
682 #define _cleanup_free_ _cleanup_(freep)
683 #define _cleanup_close_ _cleanup_(closep)
684 #define _cleanup_umask_ _cleanup_(umaskp)
685 #define _cleanup_globfree_ _cleanup_(globfree)
686 #define _cleanup_fclose_ _cleanup_(fclosep)
687 #define _cleanup_pclose_ _cleanup_(pclosep)
688 #define _cleanup_closedir_ _cleanup_(closedirp)
689 #define _cleanup_endmntent_ _cleanup_(endmntentp)
690 #define _cleanup_close_pair_ _cleanup_(close_pairp)
692 _malloc_ _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b) {
693 if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
696 return malloc(a * b);
699 _alloc_(2, 3) static inline void *realloc_multiply(void *p, size_t a, size_t b) {
700 if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
703 return realloc(p, a * b);
706 _alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
707 if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
710 return memdup(p, a * b);
713 bool filename_is_safe(const char *p) _pure_;
714 bool path_is_safe(const char *p) _pure_;
715 bool string_is_safe(const char *p) _pure_;
716 bool string_has_cc(const char *p, const char *ok) _pure_;
719 * Check if a string contains any glob patterns.
721 _pure_ static inline bool string_is_glob(const char *p) {
722 return !!strpbrk(p, GLOB_CHARS);
725 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
726 int (*compar) (const void *, const void *, void *),
729 bool is_locale_utf8(void);
731 typedef enum DrawSpecialChar {
736 DRAW_TRIANGULAR_BULLET,
740 _DRAW_SPECIAL_CHAR_MAX
743 const char *draw_special_char(DrawSpecialChar ch);
745 char *strreplace(const char *text, const char *old_string, const char *new_string);
747 char *strip_tab_ansi(char **p, size_t *l);
749 int on_ac_power(void);
751 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f);
752 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f);
754 #define FOREACH_LINE(line, f, on_error) \
756 if (!fgets(line, sizeof(line), f)) { \
763 #define FOREACH_DIRENT(de, d, on_error) \
764 for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d)) \
770 } else if (ignore_file((de)->d_name)) \
774 static inline void *mempset(void *s, int c, size_t n) {
776 return (uint8_t*)s + n;
779 char *hexmem(const void *p, size_t l);
780 void *unhexmem(const char *p, size_t l);
782 char *strextend(char **x, ...) _sentinel_;
783 char *strrep(const char *s, unsigned n);
785 void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size);
786 void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size);
787 #define GREEDY_REALLOC(array, allocated, need) \
788 greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
790 #define GREEDY_REALLOC0(array, allocated, need) \
791 greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
793 static inline void _reset_errno_(int *saved_errno) {
794 errno = *saved_errno;
797 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
799 static inline int negative_errno(void) {
800 /* This helper should be used to shut up gcc if you know 'errno' is
801 * negative. Instead of "return -errno;", use "return negative_errno();"
802 * It will suppress bogus gcc warnings in case it assumes 'errno' might
803 * be 0 and thus the caller's error-handling might not be triggered. */
804 assert_return(errno > 0, -EINVAL);
808 struct _umask_struct_ {
813 static inline void _reset_umask_(struct _umask_struct_ *s) {
817 #define RUN_WITH_UMASK(mask) \
818 for (_cleanup_(_reset_umask_) struct _umask_struct_ _saved_umask_ = { umask(mask), false }; \
819 !_saved_umask_.quit ; \
820 _saved_umask_.quit = true)
822 static inline unsigned u64log2(uint64_t n) {
823 #if __SIZEOF_LONG_LONG__ == 8
824 return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
830 static inline unsigned u32ctz(uint32_t n) {
831 #if __SIZEOF_INT__ == 4
832 return __builtin_ctz(n);
838 static inline int log2i(int x) {
841 return __SIZEOF_INT__ * 8 - __builtin_clz(x) - 1;
844 static inline unsigned log2u(unsigned x) {
847 return sizeof(unsigned) * 8 - __builtin_clz(x) - 1;
850 static inline unsigned log2u_round_up(unsigned x) {
856 return log2u(x - 1) + 1;
859 static inline bool logind_running(void) {
860 return access("/run/systemd/seats/", F_OK) >= 0;
863 #define DECIMAL_STR_WIDTH(x) \
865 typeof(x) _x_ = (x); \
872 int unlink_noerrno(const char *path);
878 _new_ = alloca(_len_); \
879 (void *) memset(_new_, 0, _len_); \
882 #define alloca_align(size, align) \
885 size_t _mask_ = (align) - 1; \
886 _ptr_ = alloca((size) + _mask_); \
887 (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_); \
890 #define alloca0_align(size, align) \
893 size_t _size_ = (size); \
894 _new_ = alloca_align(_size_, (align)); \
895 (void*)memset(_new_, 0, _size_); \
898 #define strappenda(a, ...) \
900 int _len = strlen(a); \
903 const char *_appendees_[] = { __VA_ARGS__ }; \
904 for (_i = 0; _i < ELEMENTSOF(_appendees_); _i++) \
905 _len += strlen(_appendees_[_i]); \
906 _d_ = alloca(_len + 1); \
907 _p_ = stpcpy(_d_, a); \
908 for (_i = 0; _i < ELEMENTSOF(_appendees_); _i++) \
909 _p_ = stpcpy(_p_, _appendees_[_i]); \
913 #define procfs_file_alloca(pid, field) \
915 pid_t _pid_ = (pid); \
918 _r_ = ("/proc/self/" field); \
920 _r_ = alloca(strlen("/proc/") + DECIMAL_STR_MAX(pid_t) + 1 + sizeof(field)); \
921 sprintf((char*) _r_, "/proc/"PID_FMT"/" field, _pid_); \
926 struct _locale_struct_ {
927 locale_t saved_locale;
932 static inline void _reset_locale_(struct _locale_struct_ *s) {
934 if (s->saved_locale != (locale_t) 0)
935 uselocale(s->saved_locale);
936 if (s->new_locale != (locale_t) 0)
937 freelocale(s->new_locale);
940 #define RUN_WITH_LOCALE(mask, loc) \
941 for (_cleanup_(_reset_locale_) struct _locale_struct_ _saved_locale_ = { (locale_t) 0, (locale_t) 0, false }; \
943 if (!_saved_locale_.quit) { \
945 _saved_locale_.new_locale = newlocale((mask), (loc), (locale_t) 0); \
946 if (_saved_locale_.new_locale != (locale_t) 0) \
947 _saved_locale_.saved_locale = uselocale(_saved_locale_.new_locale); \
949 !_saved_locale_.quit; }) ; \
950 _saved_locale_.quit = true)
952 bool id128_is_valid(const char *s) _pure_;
954 int split_pair(const char *s, const char *sep, char **l, char **r);
956 int shall_restore_state(void);
959 * Normal qsort requires base to be nonnull. Here were require
960 * that only if nmemb > 0.
962 static inline void qsort_safe(void *base, size_t nmemb, size_t size,
963 int (*compar)(const void *, const void *)) {
966 qsort(base, nmemb, size, compar);
970 int proc_cmdline(char **ret);
971 int parse_proc_cmdline(int (*parse_word)(const char *key, const char *value));
973 int container_get_leader(const char *machine, pid_t *pid);
975 int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *root_fd);
976 int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int root_fd);
978 bool pid_is_alive(pid_t pid);
979 bool pid_is_unwaited(pid_t pid);
981 int getpeercred(int fd, struct ucred *ucred);
982 int getpeersec(int fd, char **ret);
984 int writev_safe(int fd, const struct iovec *w, int j);
986 int mkostemp_safe(char *pattern, int flags);
987 int open_tmpfile(const char *path, int flags);
989 int fd_warn_permissions(const char *path, int fd);
991 unsigned long personality_from_string(const char *p);
992 const char *personality_to_string(unsigned long);
994 uint64_t physical_memory(void);
996 char* mount_test_option(const char *haystack, const char *needle);
998 void hexdump(FILE *f, const void *p, size_t s);
1000 union file_handle_union {
1001 struct file_handle handle;
1002 char padding[sizeof(struct file_handle) + MAX_HANDLE_SZ];
1005 int update_reboot_param_file(const char *param);
1007 int umount_recursive(const char *target, int flags);
1009 int bind_remount_recursive(const char *prefix, bool ro);
1011 int fflush_and_check(FILE *f);
1013 char *tempfn_xxxxxx(const char *p);
1014 char *tempfn_random(const char *p);
1016 bool is_localhost(const char *hostname);
1018 int take_password_lock(const char *root);
1020 int is_symlink(const char *path);
1021 int is_dir(const char *path, bool follow);
1023 int unquote_first_word(const char **p, char **ret, bool relax);
1024 int unquote_many_words(const char **p, ...) _sentinel_;
1026 int free_and_strdup(char **p, const char *s);
1028 int sethostname_idempotent(const char *s);