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/>.
35 #include <sys/types.h>
38 #include <sys/resource.h>
44 #include "time-util.h"
46 union dirent_storage {
48 uint8_t storage[offsetof(struct dirent, d_name) +
49 ((NAME_MAX + 1 + sizeof(long)) & ~(sizeof(long) - 1))];
52 /* What is interpreted as whitespace? */
53 #define WHITESPACE " \t\n\r"
54 #define NEWLINE "\n\r"
58 #define FORMAT_BYTES_MAX 8
60 #define ANSI_HIGHLIGHT_ON "\x1B[1;39m"
61 #define ANSI_RED_ON "\x1B[31m"
62 #define ANSI_HIGHLIGHT_RED_ON "\x1B[1;31m"
63 #define ANSI_GREEN_ON "\x1B[32m"
64 #define ANSI_HIGHLIGHT_GREEN_ON "\x1B[1;32m"
65 #define ANSI_HIGHLIGHT_YELLOW_ON "\x1B[1;33m"
66 #define ANSI_HIGHLIGHT_OFF "\x1B[0m"
67 #define ANSI_ERASE_TO_END_OF_LINE "\x1B[K"
69 size_t page_size(void);
70 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
72 #define streq(a,b) (strcmp((a),(b)) == 0)
73 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
74 #define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
75 #define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
77 bool streq_ptr(const char *a, const char *b) _pure_;
79 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
81 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
83 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
85 #define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
87 #define malloc0(n) (calloc((n), 1))
89 static inline const char* yes_no(bool b) {
90 return b ? "yes" : "no";
93 static inline const char* strempty(const char *s) {
97 static inline const char* strnull(const char *s) {
98 return s ? s : "(null)";
101 static inline const char *strna(const char *s) {
102 return s ? s : "n/a";
105 static inline bool isempty(const char *p) {
109 char *endswith(const char *s, const char *postfix) _pure_;
110 char *startswith(const char *s, const char *prefix) _pure_;
111 char *startswith_no_case(const char *s, const char *prefix) _pure_;
113 bool first_word(const char *s, const char *word) _pure_;
115 int close_nointr(int fd);
116 void close_nointr_nofail(int fd);
117 void close_many(const int fds[], unsigned n_fd);
119 int parse_boolean(const char *v) _pure_;
120 int parse_bytes(const char *t, off_t *bytes);
121 int parse_pid(const char *s, pid_t* ret_pid);
122 int parse_uid(const char *s, uid_t* ret_uid);
123 #define parse_gid(s, ret_uid) parse_uid(s, ret_uid)
125 int safe_atou(const char *s, unsigned *ret_u);
126 int safe_atoi(const char *s, int *ret_i);
128 int safe_atollu(const char *s, unsigned long long *ret_u);
129 int safe_atolli(const char *s, long long int *ret_i);
131 int safe_atod(const char *s, double *ret_d);
134 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
135 assert_cc(sizeof(unsigned long) == sizeof(unsigned));
136 return safe_atou(s, (unsigned*) ret_u);
138 static inline int safe_atoli(const char *s, long int *ret_u) {
139 assert_cc(sizeof(long int) == sizeof(int));
140 return safe_atoi(s, (int*) ret_u);
143 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
144 assert_cc(sizeof(unsigned long) == sizeof(unsigned long long));
145 return safe_atollu(s, (unsigned long long*) ret_u);
147 static inline int safe_atoli(const char *s, long int *ret_u) {
148 assert_cc(sizeof(long int) == sizeof(long long int));
149 return safe_atolli(s, (long long int*) ret_u);
153 static inline int safe_atou32(const char *s, uint32_t *ret_u) {
154 assert_cc(sizeof(uint32_t) == sizeof(unsigned));
155 return safe_atou(s, (unsigned*) ret_u);
158 static inline int safe_atoi32(const char *s, int32_t *ret_i) {
159 assert_cc(sizeof(int32_t) == sizeof(int));
160 return safe_atoi(s, (int*) ret_i);
163 static inline int safe_atou64(const char *s, uint64_t *ret_u) {
164 assert_cc(sizeof(uint64_t) == sizeof(unsigned long long));
165 return safe_atollu(s, (unsigned long long*) ret_u);
168 static inline int safe_atoi64(const char *s, int64_t *ret_i) {
169 assert_cc(sizeof(int64_t) == sizeof(long long int));
170 return safe_atolli(s, (long long int*) ret_i);
173 char *split(const char *c, size_t *l, const char *separator, char **state);
174 char *split_quoted(const char *c, size_t *l, char **state);
176 #define FOREACH_WORD(word, length, s, state) \
177 for ((state) = NULL, (word) = split((s), &(length), WHITESPACE, &(state)); (word); (word) = split((s), &(length), WHITESPACE, &(state)))
179 #define FOREACH_WORD_SEPARATOR(word, length, s, separator, state) \
180 for ((state) = NULL, (word) = split((s), &(length), (separator), &(state)); (word); (word) = split((s), &(length), (separator), &(state)))
182 #define FOREACH_WORD_QUOTED(word, length, s, state) \
183 for ((state) = NULL, (word) = split_quoted((s), &(length), &(state)); (word); (word) = split_quoted((s), &(length), &(state)))
185 pid_t get_parent_of_pid(pid_t pid, pid_t *ppid);
186 int get_starttime_of_pid(pid_t pid, unsigned long long *st);
188 char *strappend(const char *s, const char *suffix);
189 char *strnappend(const char *s, const char *suffix, size_t length);
191 char *replace_env(const char *format, char **env);
192 char **replace_env_argv(char **argv, char **env);
194 int readlink_malloc(const char *p, char **r);
195 int readlink_and_make_absolute(const char *p, char **r);
196 int readlink_and_canonicalize(const char *p, char **r);
198 int reset_all_signal_handlers(void);
200 char *strstrip(char *s);
201 char *delete_chars(char *s, const char *bad);
202 char *truncate_nl(char *s);
204 char *file_in_same_dir(const char *path, const char *filename);
206 int rmdir_parents(const char *path, const char *stop);
208 int get_process_comm(pid_t pid, char **name);
209 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line);
210 int get_process_exe(pid_t pid, char **name);
211 int get_process_uid(pid_t pid, uid_t *uid);
212 int get_process_gid(pid_t pid, gid_t *gid);
213 int get_process_capeff(pid_t pid, char **capeff);
215 char hexchar(int x) _const_;
216 int unhexchar(char c) _const_;
217 char octchar(int x) _const_;
218 int unoctchar(char c) _const_;
219 char decchar(int x) _const_;
220 int undecchar(char c) _const_;
222 char *cescape(const char *s);
223 char *cunescape(const char *s);
224 char *cunescape_length(const char *s, size_t length);
225 char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix);
227 char *xescape(const char *s, const char *bad);
229 char *bus_path_escape(const char *s);
230 char *bus_path_unescape(const char *s);
232 char *ascii_strlower(char *path);
234 bool dirent_is_file(const struct dirent *de) _pure_;
235 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
237 bool ignore_file(const char *filename) _pure_;
239 bool chars_intersect(const char *a, const char *b) _pure_;
241 int make_stdio(int fd);
242 int make_null_stdio(void);
243 int make_console_stdio(void);
245 unsigned long long random_ull(void);
247 /* For basic lookup tables with strictly enumerated entries */
248 #define __DEFINE_STRING_TABLE_LOOKUP(name,type,scope) \
249 scope const char *name##_to_string(type i) { \
250 if (i < 0 || i >= (type) ELEMENTSOF(name##_table)) \
252 return name##_table[i]; \
254 scope type name##_from_string(const char *s) { \
257 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++) \
258 if (name##_table[i] && \
259 streq(name##_table[i], s)) \
263 struct __useless_struct_to_allow_trailing_semicolon__
265 #define DEFINE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,)
266 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,static)
268 /* For string conversions where numbers are also acceptable */
269 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max) \
270 int name##_to_string_alloc(type i, char **str) { \
273 if (i < 0 || i > max) \
275 if (i < (type) ELEMENTSOF(name##_table)) { \
276 s = strdup(name##_table[i]); \
280 r = asprintf(&s, "%u", i); \
287 type name##_from_string(const char *s) { \
291 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++) \
292 if (name##_table[i] && \
293 streq(name##_table[i], s)) \
295 if (safe_atou(s, &u) >= 0 && u <= max) \
299 struct __useless_struct_to_allow_trailing_semicolon__
301 int fd_nonblock(int fd, bool nonblock);
302 int fd_cloexec(int fd, bool cloexec);
304 int close_all_fds(const int except[], unsigned n_except);
306 bool fstype_is_network(const char *fstype);
310 int read_one_char(FILE *f, char *ret, usec_t timeout, bool *need_nl);
311 int ask(char *ret, const char *replies, const char *text, ...) _printf_attr_(3, 4);
313 int reset_terminal_fd(int fd, bool switch_to_text);
314 int reset_terminal(const char *name);
316 int open_terminal(const char *name, int mode);
317 int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm, usec_t timeout);
318 int release_terminal(void);
320 int flush_fd(int fd);
322 int ignore_signals(int sig, ...);
323 int default_signals(int sig, ...);
324 int sigaction_many(const struct sigaction *sa, ...);
326 int close_pipe(int p[]);
327 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
329 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll);
330 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll);
332 bool is_device_path(const char *path);
334 int dir_is_empty(const char *path);
335 char* dirname_malloc(const char *path);
337 void rename_process(const char name[8]);
339 void sigset_add_many(sigset_t *ss, ...);
341 bool hostname_is_set(void);
343 char* gethostname_malloc(void);
344 char* getlogname_malloc(void);
345 char* getusername_malloc(void);
347 int getttyname_malloc(int fd, char **r);
348 int getttyname_harder(int fd, char **r);
350 int get_ctty_devnr(pid_t pid, dev_t *d);
351 int get_ctty(pid_t, dev_t *_devnr, char **r);
353 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
354 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
356 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
357 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
358 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
359 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
361 int pipe_eof(int fd);
363 cpu_set_t* cpu_set_malloc(unsigned *ncpus);
365 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) _printf_attr_(4,0);
366 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) _printf_attr_(4,5);
367 int status_welcome(void);
369 int fd_columns(int fd);
370 unsigned columns(void);
371 int fd_lines(int fd);
372 unsigned lines(void);
373 void columns_lines_cache_reset(int _unused_ signum);
377 static inline const char *ansi_highlight(void) {
378 return on_tty() ? ANSI_HIGHLIGHT_ON : "";
381 static inline const char *ansi_highlight_red(void) {
382 return on_tty() ? ANSI_HIGHLIGHT_RED_ON : "";
385 static inline const char *ansi_highlight_green(void) {
386 return on_tty() ? ANSI_HIGHLIGHT_GREEN_ON : "";
389 static inline const char *ansi_highlight_off(void) {
390 return on_tty() ? ANSI_HIGHLIGHT_OFF : "";
393 int running_in_chroot(void);
395 char *ellipsize(const char *s, size_t length, unsigned percent);
396 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent);
398 int touch(const char *path);
400 char *unquote(const char *s, const char *quotes);
401 char *normalize_env_assignment(const char *s);
403 int wait_for_terminate(pid_t pid, siginfo_t *status);
404 int wait_for_terminate_and_warn(const char *name, pid_t pid);
406 _noreturn_ void freeze(void);
408 bool null_or_empty(struct stat *st) _pure_;
409 int null_or_empty_path(const char *fn);
411 DIR *xopendirat(int dirfd, const char *name, int flags);
413 char *fstab_node_to_udev_node(const char *p);
415 char *resolve_dev_console(char **active);
416 bool tty_is_vc(const char *tty);
417 bool tty_is_vc_resolve(const char *tty);
418 bool tty_is_console(const char *tty) _pure_;
419 int vtnr_from_tty(const char *tty);
420 const char *default_term_for_tty(const char *tty);
422 void execute_directory(const char *directory, DIR *_d, char *argv[]);
424 int kill_and_sigcont(pid_t pid, int sig);
426 bool nulstr_contains(const char*nulstr, const char *needle);
428 bool plymouth_running(void);
430 bool hostname_is_valid(const char *s) _pure_;
431 char* hostname_cleanup(char *s, bool lowercase);
433 char* strshorten(char *s, size_t l);
435 int terminal_vhangup_fd(int fd);
436 int terminal_vhangup(const char *name);
438 int vt_disallocate(const char *name);
440 int copy_file(const char *from, const char *to);
442 int symlink_atomic(const char *from, const char *to);
444 int fchmod_umask(int fd, mode_t mode);
446 bool display_is_local(const char *display) _pure_;
447 int socket_from_display(const char *display, char **path);
449 int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell);
450 int get_group_creds(const char **groupname, gid_t *gid);
452 int in_gid(gid_t gid);
453 int in_group(const char *name);
455 char* uid_to_name(uid_t uid);
456 char* gid_to_name(gid_t gid);
458 int glob_exists(const char *path);
459 int glob_extend(char ***strv, const char *path);
461 int dirent_ensure_type(DIR *d, struct dirent *de);
463 int in_search_path(const char *path, char **search);
464 int get_files_in_directory(const char *path, char ***list);
466 char *strjoin(const char *x, ...) _sentinel_;
468 bool is_main_thread(void);
470 bool in_charset(const char *s, const char* charset) _pure_;
472 int block_get_whole_disk(dev_t d, dev_t *ret);
474 int file_is_priv_sticky(const char *p);
476 int strdup_or_null(const char *a, char **b);
478 #define NULSTR_FOREACH(i, l) \
479 for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
481 #define NULSTR_FOREACH_PAIR(i, j, l) \
482 for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
484 int ioprio_class_to_string_alloc(int i, char **s);
485 int ioprio_class_from_string(const char *s);
487 const char *sigchld_code_to_string(int i) _const_;
488 int sigchld_code_from_string(const char *s) _pure_;
490 int log_facility_unshifted_to_string_alloc(int i, char **s);
491 int log_facility_unshifted_from_string(const char *s);
493 int log_level_to_string_alloc(int i, char **s);
494 int log_level_from_string(const char *s);
496 int sched_policy_to_string_alloc(int i, char **s);
497 int sched_policy_from_string(const char *s);
499 const char *rlimit_to_string(int i) _const_;
500 int rlimit_from_string(const char *s) _pure_;
502 int ip_tos_to_string_alloc(int i, char **s);
503 int ip_tos_from_string(const char *s);
505 const char *signal_to_string(int i) _const_;
506 int signal_from_string(const char *s) _pure_;
508 int signal_from_string_try_harder(const char *s);
510 extern int saved_argc;
511 extern char **saved_argv;
513 bool kexec_loaded(void);
515 int prot_from_flags(int flags) _const_;
517 char *format_bytes(char *buf, size_t l, off_t t);
519 int fd_wait_for_event(int fd, int event, usec_t timeout);
521 void* memdup(const void *p, size_t l) _alloc_(2);
523 int is_kernel_thread(pid_t pid);
525 int fd_inc_sndbuf(int fd, size_t n);
526 int fd_inc_rcvbuf(int fd, size_t n);
528 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
530 int setrlimit_closest(int resource, const struct rlimit *rlim);
532 int getenv_for_pid(pid_t pid, const char *field, char **_value);
534 bool is_valid_documentation_url(const char *url) _pure_;
536 bool in_initrd(void);
538 void warn_melody(void);
540 int get_home_dir(char **ret);
542 static inline void freep(void *p) {
546 static inline void fclosep(FILE **f) {
551 static inline void pclosep(FILE **f) {
556 static inline void closep(int *fd) {
558 close_nointr_nofail(*fd);
561 static inline void closedirp(DIR **d) {
566 static inline void umaskp(mode_t *u) {
570 #define _cleanup_free_ _cleanup_(freep)
571 #define _cleanup_fclose_ _cleanup_(fclosep)
572 #define _cleanup_pclose_ _cleanup_(pclosep)
573 #define _cleanup_close_ _cleanup_(closep)
574 #define _cleanup_closedir_ _cleanup_(closedirp)
575 #define _cleanup_umask_ _cleanup_(umaskp)
576 #define _cleanup_globfree_ _cleanup_(globfree)
578 _malloc_ _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b) {
579 if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
582 return malloc(a * b);
585 _alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
586 if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
589 return memdup(p, a * b);
592 bool filename_is_safe(const char *p) _pure_;
593 bool path_is_safe(const char *p) _pure_;
594 bool string_is_safe(const char *p) _pure_;
595 bool string_has_cc(const char *p) _pure_;
597 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
598 int (*compar) (const void *, const void *, void *),
601 bool is_locale_utf8(void);
603 typedef enum DrawSpecialChar {
608 DRAW_TRIANGULAR_BULLET,
609 _DRAW_SPECIAL_CHAR_MAX
611 const char *draw_special_char(DrawSpecialChar ch);
613 char *strreplace(const char *text, const char *old_string, const char *new_string);
615 char *strip_tab_ansi(char **p, size_t *l);
617 int on_ac_power(void);
619 int search_and_fopen(const char *path, const char *mode, const char **search, FILE **_f);
620 int search_and_fopen_nulstr(const char *path, const char *mode, const char *search, FILE **_f);
621 int create_tmp_dir(char template[], char** dir_name);
623 #define FOREACH_LINE(line, f, on_error) \
625 if (!fgets(line, sizeof(line), f)) { \
632 #define FOREACH_DIRENT(de, d, on_error) \
633 for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d)) \
639 } else if (ignore_file((de)->d_name)) \
643 static inline void *mempset(void *s, int c, size_t n) {
645 return (uint8_t*)s + n;
648 char *hexmem(const void *p, size_t l);
649 void *unhexmem(const char *p, size_t l);
651 char *strextend(char **x, ...) _sentinel_;
652 char *strrep(const char *s, unsigned n);
654 void* greedy_realloc(void **p, size_t *allocated, size_t need);
655 #define GREEDY_REALLOC(array, allocated, need) \
656 greedy_realloc((void**) &(array), &(allocated), sizeof((array)[0]) * (need))
658 static inline void _reset_errno_(int *saved_errno) {
659 errno = *saved_errno;
662 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
664 struct _umask_struct_ {
669 static inline void _reset_umask_(struct _umask_struct_ *s) {
673 #define RUN_WITH_UMASK(mask) \
674 for (_cleanup_(_reset_umask_) struct _umask_struct_ _saved_umask_ = { umask(mask), false }; \
675 !_saved_umask_.quit ; \
676 _saved_umask_.quit = true)
678 static inline unsigned u64log2(uint64_t n) {
679 return (n > 1) ? __builtin_clzll(n) ^ 63U : 0;
682 static inline bool logind_running(void) {
683 return access("/run/systemd/seats/", F_OK) >= 0;
686 #define DECIMAL_STR_WIDTH(x) \
688 typeof(x) _x_ = (x); \
695 int unlink_noerrno(const char *path);
701 _new_ = alloca(_len_); \
702 (void *) memset(_new_, 0, _len_); \
705 #define strappenda(a, b) \
707 const char *_a_ = (a), *_b_ = (b); \
712 _c_ = alloca(_x_ + _y_ + 1); \
713 strcpy(stpcpy(_c_, _a_), _b_); \
717 #define procfs_file_alloca(pid, field) \
719 pid_t _pid_ = (pid); \
721 _r_ = alloca(sizeof("/proc/") -1 + DECIMAL_STR_MAX(pid_t) + 1 + sizeof(field)); \
722 sprintf(_r_, "/proc/%lu/" field, (unsigned long) _pid_); \
726 struct _locale_struct_ {
727 locale_t saved_locale;
732 static inline void _reset_locale_(struct _locale_struct_ *s) {
734 if (s->saved_locale != (locale_t) 0)
735 uselocale(s->saved_locale);
736 if (s->new_locale != (locale_t) 0)
737 freelocale(s->new_locale);
740 #define RUN_WITH_LOCALE(mask, loc) \
741 for (_cleanup_(_reset_locale_) struct _locale_struct_ _saved_locale_ = { (locale_t) 0, (locale_t) 0, false }; \
743 if (!_saved_locale_.quit) { \
745 _saved_locale_.new_locale = newlocale((mask), (loc), (locale_t) 0); \
746 if (_saved_locale_.new_locale != (locale_t) 0) \
747 _saved_locale_.saved_locale = uselocale(_saved_locale_.new_locale); \
749 !_saved_locale_.quit; }) ; \
750 _saved_locale_.quit = true)
752 bool id128_is_valid(const char *s) _pure_;
753 void parse_user_at_host(char *arg, char **user, char **host);
755 int split_pair(const char *s, const char *sep, char **l, char **r);