1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
13 #include <stdio_ext.h>
18 #include <sys/types.h>
21 #include "alloc-util.h"
29 #include "hexdecoct.h"
33 #include "parse-util.h"
34 #include "path-util.h"
35 #include "process-util.h"
36 #include "random-util.h"
37 #include "stdio-util.h"
38 #include "string-util.h"
40 #include "time-util.h"
41 #include "umask-util.h"
44 #define READ_FULL_BYTES_MAX (4U*1024U*1024U)
46 int write_string_stream_ts(
49 WriteStringFileFlags flags
,
50 struct timespec
*ts
) {
61 needs_nl
= !(flags
& WRITE_STRING_FILE_AVOID_NEWLINE
) && !endswith(line
, "\n");
63 if (needs_nl
&& (flags
& WRITE_STRING_FILE_DISABLE_BUFFER
)) {
64 /* If STDIO buffering was disabled, then let's append the newline character to the string itself, so
65 * that the write goes out in one go, instead of two */
67 line
= strjoina(line
, "\n");
71 if (fputs(line
, f
) == EOF
)
75 if (fputc('\n', f
) == EOF
)
78 if (flags
& WRITE_STRING_FILE_SYNC
)
79 r
= fflush_sync_and_check(f
);
81 r
= fflush_and_check(f
);
86 struct timespec twice
[2] = {*ts
, *ts
};
88 if (futimens(fileno(f
), twice
) < 0)
95 static int write_string_file_atomic(
98 WriteStringFileFlags flags
,
99 struct timespec
*ts
) {
101 _cleanup_fclose_
FILE *f
= NULL
;
102 _cleanup_free_
char *p
= NULL
;
108 r
= fopen_temporary(fn
, &f
, &p
);
112 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
113 (void) fchmod_umask(fileno(f
), 0644);
115 r
= write_string_stream_ts(f
, line
, flags
, ts
);
119 if (rename(p
, fn
) < 0) {
131 int write_string_file_ts(
134 WriteStringFileFlags flags
,
135 struct timespec
*ts
) {
137 _cleanup_fclose_
FILE *f
= NULL
;
143 /* We don't know how to verify whether the file contents was already on-disk. */
144 assert(!((flags
& WRITE_STRING_FILE_VERIFY_ON_FAILURE
) && (flags
& WRITE_STRING_FILE_SYNC
)));
146 if (flags
& WRITE_STRING_FILE_ATOMIC
) {
147 assert(flags
& WRITE_STRING_FILE_CREATE
);
149 r
= write_string_file_atomic(fn
, line
, flags
, ts
);
157 if (flags
& WRITE_STRING_FILE_CREATE
) {
166 /* We manually build our own version of fopen(..., "we") that
167 * works without O_CREAT */
168 fd
= open(fn
, O_WRONLY
|O_CLOEXEC
|O_NOCTTY
);
174 f
= fdopen(fd
, "we");
182 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
184 if (flags
& WRITE_STRING_FILE_DISABLE_BUFFER
)
185 setvbuf(f
, NULL
, _IONBF
, 0);
187 r
= write_string_stream_ts(f
, line
, flags
, ts
);
194 if (!(flags
& WRITE_STRING_FILE_VERIFY_ON_FAILURE
))
199 /* OK, the operation failed, but let's see if the right
200 * contents in place already. If so, eat up the error. */
202 q
= verify_file(fn
, line
, !(flags
& WRITE_STRING_FILE_AVOID_NEWLINE
));
209 int write_string_filef(
211 WriteStringFileFlags flags
,
212 const char *format
, ...) {
214 _cleanup_free_
char *p
= NULL
;
218 va_start(ap
, format
);
219 r
= vasprintf(&p
, format
, ap
);
225 return write_string_file(fn
, p
, flags
);
228 int read_one_line_file(const char *fn
, char **line
) {
229 _cleanup_fclose_
FILE *f
= NULL
;
239 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
241 r
= read_line(f
, LONG_LINE_MAX
, line
);
242 return r
< 0 ? r
: 0;
245 int verify_file(const char *fn
, const char *blob
, bool accept_extra_nl
) {
246 _cleanup_fclose_
FILE *f
= NULL
;
247 _cleanup_free_
char *buf
= NULL
;
255 if (accept_extra_nl
&& endswith(blob
, "\n"))
256 accept_extra_nl
= false;
258 buf
= malloc(l
+ accept_extra_nl
+ 1);
266 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
268 /* We try to read one byte more than we need, so that we know whether we hit eof */
270 k
= fread(buf
, 1, l
+ accept_extra_nl
+ 1, f
);
272 return errno
> 0 ? -errno
: -EIO
;
274 if (k
!= l
&& k
!= l
+ accept_extra_nl
)
276 if (memcmp(buf
, blob
, l
) != 0)
278 if (k
> l
&& buf
[l
] != '\n')
284 int read_full_stream(FILE *f
, char **contents
, size_t *size
) {
285 _cleanup_free_
char *buf
= NULL
;
296 if (fd
>= 0) { /* If the FILE* object is backed by an fd (as opposed to memory or such, see fmemopen(), let's
297 * optimize our buffering) */
299 if (fstat(fileno(f
), &st
) < 0)
302 if (S_ISREG(st
.st_mode
)) {
305 if (st
.st_size
> READ_FULL_BYTES_MAX
)
308 /* Start with the right file size, but be prepared for files from /proc which generally report a file
309 * size of 0. Note that we increase the size to read here by one, so that the first read attempt
310 * already makes us notice the EOF. */
321 t
= realloc(buf
, n
+ 1);
327 k
= fread(buf
+ l
, 1, n
- l
, f
);
332 return errno
> 0 ? -errno
: -EIO
;
337 /* We aren't expecting fread() to return a short read outside
338 * of (error && eof), assert buffer is full and enlarge buffer.
343 if (n
>= READ_FULL_BYTES_MAX
)
346 n
= MIN(n
* 2, READ_FULL_BYTES_MAX
);
350 *contents
= TAKE_PTR(buf
);
358 int read_full_file(const char *fn
, char **contents
, size_t *size
) {
359 _cleanup_fclose_
FILE *f
= NULL
;
368 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
370 return read_full_stream(f
, contents
, size
);
373 static int parse_env_file_internal(
377 int (*push
) (const char *filename
, unsigned line
,
378 const char *key
, char *value
, void *userdata
, int *n_pushed
),
382 size_t key_alloc
= 0, n_key
= 0, value_alloc
= 0, n_value
= 0, last_value_whitespace
= (size_t) -1, last_key_whitespace
= (size_t) -1;
383 _cleanup_free_
char *contents
= NULL
, *key
= NULL
, *value
= NULL
;
395 SINGLE_QUOTE_VALUE_ESCAPE
,
397 DOUBLE_QUOTE_VALUE_ESCAPE
,
405 r
= read_full_stream(f
, &contents
, NULL
);
407 r
= read_full_file(fname
, &contents
, NULL
);
411 for (p
= contents
; *p
; p
++) {
417 if (strchr(COMMENTS
, c
))
419 else if (!strchr(WHITESPACE
, c
)) {
421 last_key_whitespace
= (size_t) -1;
423 if (!GREEDY_REALLOC(key
, key_alloc
, n_key
+2))
431 if (strchr(newline
, c
)) {
435 } else if (c
== '=') {
437 last_value_whitespace
= (size_t) -1;
439 if (!strchr(WHITESPACE
, c
))
440 last_key_whitespace
= (size_t) -1;
441 else if (last_key_whitespace
== (size_t) -1)
442 last_key_whitespace
= n_key
;
444 if (!GREEDY_REALLOC(key
, key_alloc
, n_key
+2))
453 if (strchr(newline
, c
)) {
461 /* strip trailing whitespace from key */
462 if (last_key_whitespace
!= (size_t) -1)
463 key
[last_key_whitespace
] = 0;
465 r
= push(fname
, line
, key
, value
, userdata
, n_pushed
);
471 value_alloc
= n_value
= 0;
473 } else if (c
== '\'')
474 state
= SINGLE_QUOTE_VALUE
;
476 state
= DOUBLE_QUOTE_VALUE
;
478 state
= VALUE_ESCAPE
;
479 else if (!strchr(WHITESPACE
, c
)) {
482 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
485 value
[n_value
++] = c
;
491 if (strchr(newline
, c
)) {
500 /* Chomp off trailing whitespace from value */
501 if (last_value_whitespace
!= (size_t) -1)
502 value
[last_value_whitespace
] = 0;
504 /* strip trailing whitespace from key */
505 if (last_key_whitespace
!= (size_t) -1)
506 key
[last_key_whitespace
] = 0;
508 r
= push(fname
, line
, key
, value
, userdata
, n_pushed
);
514 value_alloc
= n_value
= 0;
516 } else if (c
== '\\') {
517 state
= VALUE_ESCAPE
;
518 last_value_whitespace
= (size_t) -1;
520 if (!strchr(WHITESPACE
, c
))
521 last_value_whitespace
= (size_t) -1;
522 else if (last_value_whitespace
== (size_t) -1)
523 last_value_whitespace
= n_value
;
525 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
528 value
[n_value
++] = c
;
536 if (!strchr(newline
, c
)) {
537 /* Escaped newlines we eat up entirely */
538 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
541 value
[n_value
++] = c
;
545 case SINGLE_QUOTE_VALUE
:
549 state
= SINGLE_QUOTE_VALUE_ESCAPE
;
551 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
554 value
[n_value
++] = c
;
559 case SINGLE_QUOTE_VALUE_ESCAPE
:
560 state
= SINGLE_QUOTE_VALUE
;
562 if (!strchr(newline
, c
)) {
563 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
566 value
[n_value
++] = c
;
570 case DOUBLE_QUOTE_VALUE
:
574 state
= DOUBLE_QUOTE_VALUE_ESCAPE
;
576 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
579 value
[n_value
++] = c
;
584 case DOUBLE_QUOTE_VALUE_ESCAPE
:
585 state
= DOUBLE_QUOTE_VALUE
;
587 if (!strchr(newline
, c
)) {
588 if (!GREEDY_REALLOC(value
, value_alloc
, n_value
+2))
591 value
[n_value
++] = c
;
597 state
= COMMENT_ESCAPE
;
598 else if (strchr(newline
, c
)) {
615 SINGLE_QUOTE_VALUE_ESCAPE
,
617 DOUBLE_QUOTE_VALUE_ESCAPE
)) {
625 if (last_value_whitespace
!= (size_t) -1)
626 value
[last_value_whitespace
] = 0;
628 /* strip trailing whitespace from key */
629 if (last_key_whitespace
!= (size_t) -1)
630 key
[last_key_whitespace
] = 0;
632 r
= push(fname
, line
, key
, value
, userdata
, n_pushed
);
642 static int check_utf8ness_and_warn(
643 const char *filename
, unsigned line
,
644 const char *key
, char *value
) {
646 if (!utf8_is_valid(key
)) {
647 _cleanup_free_
char *p
= NULL
;
649 p
= utf8_escape_invalid(key
);
650 log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename
), line
, p
);
654 if (value
&& !utf8_is_valid(value
)) {
655 _cleanup_free_
char *p
= NULL
;
657 p
= utf8_escape_invalid(value
);
658 log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename
), line
, key
, p
);
665 static int parse_env_file_push(
666 const char *filename
, unsigned line
,
667 const char *key
, char *value
,
672 va_list aq
, *ap
= userdata
;
675 r
= check_utf8ness_and_warn(filename
, line
, key
, value
);
681 while ((k
= va_arg(aq
, const char *))) {
684 v
= va_arg(aq
, char **);
717 r
= parse_env_file_internal(f
, fname
, newline
, parse_env_file_push
, &aq
, &n_pushed
);
734 va_start(ap
, newline
);
735 r
= parse_env_filev(f
, fname
, newline
, ap
);
741 static int load_env_file_push(
742 const char *filename
, unsigned line
,
743 const char *key
, char *value
,
746 char ***m
= userdata
;
750 r
= check_utf8ness_and_warn(filename
, line
, key
, value
);
754 p
= strjoin(key
, "=", value
);
758 r
= strv_env_replace(m
, p
);
771 int load_env_file(FILE *f
, const char *fname
, const char *newline
, char ***rl
) {
778 r
= parse_env_file_internal(f
, fname
, newline
, load_env_file_push
, &m
, NULL
);
788 static int load_env_file_push_pairs(
789 const char *filename
, unsigned line
,
790 const char *key
, char *value
,
793 char ***m
= userdata
;
796 r
= check_utf8ness_and_warn(filename
, line
, key
, value
);
800 r
= strv_extend(m
, key
);
805 r
= strv_extend(m
, "");
809 r
= strv_push(m
, value
);
820 int load_env_file_pairs(FILE *f
, const char *fname
, const char *newline
, char ***rl
) {
827 r
= parse_env_file_internal(f
, fname
, newline
, load_env_file_push_pairs
, &m
, NULL
);
837 static int merge_env_file_push(
838 const char *filename
, unsigned line
,
839 const char *key
, char *value
,
843 char ***env
= userdata
;
844 char *expanded_value
;
849 log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename
), line
, key
);
853 if (!env_name_is_valid(key
)) {
854 log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename
), line
, key
);
859 expanded_value
= replace_env(value
, *env
,
860 REPLACE_ENV_USE_ENVIRONMENT
|
861 REPLACE_ENV_ALLOW_BRACELESS
|
862 REPLACE_ENV_ALLOW_EXTENDED
);
866 free_and_replace(value
, expanded_value
);
868 return load_env_file_push(filename
, line
, key
, value
, env
, n_pushed
);
876 /* NOTE: this function supports braceful and braceless variable expansions,
877 * plus "extended" substitutions, unlike other exported parsing functions.
880 return parse_env_file_internal(f
, fname
, NEWLINE
, merge_env_file_push
, env
, NULL
);
883 static void write_env_var(FILE *f
, const char *v
) {
889 fputs_unlocked(v
, f
);
890 fputc_unlocked('\n', f
);
895 fwrite_unlocked(v
, 1, p
-v
, f
);
897 if (string_has_cc(p
, NULL
) || chars_intersect(p
, WHITESPACE SHELL_NEED_QUOTES
)) {
898 fputc_unlocked('\"', f
);
901 if (strchr(SHELL_NEED_ESCAPE
, *p
))
902 fputc_unlocked('\\', f
);
904 fputc_unlocked(*p
, f
);
907 fputc_unlocked('\"', f
);
909 fputs_unlocked(p
, f
);
911 fputc_unlocked('\n', f
);
914 int write_env_file(const char *fname
, char **l
) {
915 _cleanup_fclose_
FILE *f
= NULL
;
916 _cleanup_free_
char *p
= NULL
;
922 r
= fopen_temporary(fname
, &f
, &p
);
926 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
927 (void) fchmod_umask(fileno(f
), 0644);
930 write_env_var(f
, *i
);
932 r
= fflush_and_check(f
);
934 if (rename(p
, fname
) >= 0)
944 int executable_is_script(const char *path
, char **interpreter
) {
945 _cleanup_free_
char *line
= NULL
;
952 r
= read_one_line_file(path
, &line
);
953 if (r
== -ENOBUFS
) /* First line overly long? if so, then it's not a script */
958 if (!startswith(line
, "#!"))
961 ans
= strstrip(line
+ 2);
962 len
= strcspn(ans
, " \t");
967 ans
= strndup(ans
, len
);
976 * Retrieve one field from a file like /proc/self/status. pattern
977 * should not include whitespace or the delimiter (':'). pattern matches only
978 * the beginning of a line. Whitespace before ':' is skipped. Whitespace and
979 * zeros after the ':' will be skipped. field must be freed afterwards.
980 * terminator specifies the terminating characters of the field value (not
981 * included in the value).
983 int get_proc_field(const char *filename
, const char *pattern
, const char *terminator
, char **field
) {
984 _cleanup_free_
char *status
= NULL
;
994 r
= read_full_file(filename
, &status
, NULL
);
1004 t
= strstr(t
, pattern
);
1008 /* Check that pattern occurs in beginning of line. */
1009 pattern_ok
= (t
== status
|| t
[-1] == '\n');
1011 t
+= strlen(pattern
);
1013 } while (!pattern_ok
);
1015 t
+= strspn(t
, " \t");
1019 } while (*t
!= ':');
1024 t
+= strspn(t
, " \t");
1026 /* Also skip zeros, because when this is used for
1027 * capabilities, we don't want the zeros. This way the
1028 * same capability set always maps to the same string,
1029 * irrespective of the total capability set size. For
1030 * other numbers it shouldn't matter. */
1031 t
+= strspn(t
, "0");
1032 /* Back off one char if there's nothing but whitespace
1034 if (!*t
|| isspace(*t
))
1038 len
= strcspn(t
, terminator
);
1040 f
= strndup(t
, len
);
1048 DIR *xopendirat(int fd
, const char *name
, int flags
) {
1052 assert(!(flags
& O_CREAT
));
1054 nfd
= openat(fd
, name
, O_RDONLY
|O_NONBLOCK
|O_DIRECTORY
|O_CLOEXEC
|flags
, 0);
1067 static int search_and_fopen_internal(const char *path
, const char *mode
, const char *root
, char **search
, FILE **_f
) {
1074 if (!path_strv_resolve_uniq(search
, root
))
1077 STRV_FOREACH(i
, search
) {
1078 _cleanup_free_
char *p
= NULL
;
1082 p
= strjoin(root
, *i
, "/", path
);
1084 p
= strjoin(*i
, "/", path
);
1094 if (errno
!= ENOENT
)
1101 int search_and_fopen(const char *path
, const char *mode
, const char *root
, const char **search
, FILE **_f
) {
1102 _cleanup_strv_free_
char **copy
= NULL
;
1108 if (path_is_absolute(path
)) {
1111 f
= fopen(path
, mode
);
1120 copy
= strv_copy((char**) search
);
1124 return search_and_fopen_internal(path
, mode
, root
, copy
, _f
);
1127 int search_and_fopen_nulstr(const char *path
, const char *mode
, const char *root
, const char *search
, FILE **_f
) {
1128 _cleanup_strv_free_
char **s
= NULL
;
1130 if (path_is_absolute(path
)) {
1133 f
= fopen(path
, mode
);
1142 s
= strv_split_nulstr(search
);
1146 return search_and_fopen_internal(path
, mode
, root
, s
, _f
);
1149 int fopen_temporary(const char *path
, FILE **_f
, char **_temp_path
) {
1158 r
= tempfn_xxxxxx(path
, NULL
, &t
);
1162 fd
= mkostemp_safe(t
);
1168 f
= fdopen(fd
, "we");
1182 int fflush_and_check(FILE *f
) {
1189 return errno
> 0 ? -errno
: -EIO
;
1194 int fflush_sync_and_check(FILE *f
) {
1199 r
= fflush_and_check(f
);
1203 if (fsync(fileno(f
)) < 0)
1206 r
= fsync_directory_of_file(fileno(f
));
1213 /* This is much like mkostemp() but is subject to umask(). */
1214 int mkostemp_safe(char *pattern
) {
1215 _cleanup_umask_ mode_t u
= 0;
1222 fd
= mkostemp(pattern
, O_CLOEXEC
);
1229 int tempfn_xxxxxx(const char *p
, const char *extra
, char **ret
) {
1241 * /foo/bar/.#<extra>waldoXXXXXX
1245 if (!filename_is_valid(fn
))
1248 extra
= strempty(extra
);
1250 t
= new(char, strlen(p
) + 2 + strlen(extra
) + 6 + 1);
1254 strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t
, p
, fn
- p
), ".#"), extra
), fn
), "XXXXXX");
1256 *ret
= path_simplify(t
, false);
1260 int tempfn_random(const char *p
, const char *extra
, char **ret
) {
1274 * /foo/bar/.#<extra>waldobaa2a261115984a9
1278 if (!filename_is_valid(fn
))
1281 extra
= strempty(extra
);
1283 t
= new(char, strlen(p
) + 2 + strlen(extra
) + 16 + 1);
1287 x
= stpcpy(stpcpy(stpcpy(mempcpy(t
, p
, fn
- p
), ".#"), extra
), fn
);
1290 for (i
= 0; i
< 16; i
++) {
1291 *(x
++) = hexchar(u
& 0xF);
1297 *ret
= path_simplify(t
, false);
1301 int tempfn_random_child(const char *p
, const char *extra
, char **ret
) {
1312 * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
1321 extra
= strempty(extra
);
1323 t
= new(char, strlen(p
) + 3 + strlen(extra
) + 16 + 1);
1327 x
= stpcpy(stpcpy(stpcpy(t
, p
), "/.#"), extra
);
1330 for (i
= 0; i
< 16; i
++) {
1331 *(x
++) = hexchar(u
& 0xF);
1337 *ret
= path_simplify(t
, false);
1341 int write_timestamp_file_atomic(const char *fn
, usec_t n
) {
1342 char ln
[DECIMAL_STR_MAX(n
)+2];
1344 /* Creates a "timestamp" file, that contains nothing but a
1345 * usec_t timestamp, formatted in ASCII. */
1347 if (n
<= 0 || n
>= USEC_INFINITY
)
1350 xsprintf(ln
, USEC_FMT
"\n", n
);
1352 return write_string_file(fn
, ln
, WRITE_STRING_FILE_CREATE
|WRITE_STRING_FILE_ATOMIC
);
1355 int read_timestamp_file(const char *fn
, usec_t
*ret
) {
1356 _cleanup_free_
char *ln
= NULL
;
1360 r
= read_one_line_file(fn
, &ln
);
1364 r
= safe_atou64(ln
, &t
);
1368 if (t
<= 0 || t
>= (uint64_t) USEC_INFINITY
)
1375 int fputs_with_space(FILE *f
, const char *s
, const char *separator
, bool *space
) {
1380 /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
1381 * when specified shall initially point to a boolean variable initialized to false. It is set to true after the
1382 * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
1383 * element, but not before the first one. */
1393 r
= fputs(separator
, f
);
1404 int open_tmpfile_unlinkable(const char *directory
, int flags
) {
1409 r
= tmp_dir(&directory
);
1414 /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
1416 /* Try O_TMPFILE first, if it is supported */
1417 fd
= open(directory
, flags
|O_TMPFILE
|O_EXCL
, S_IRUSR
|S_IWUSR
);
1421 /* Fall back to unguessable name + unlinking */
1422 p
= strjoina(directory
, "/systemd-tmp-XXXXXX");
1424 fd
= mkostemp_safe(p
);
1433 int open_tmpfile_linkable(const char *target
, int flags
, char **ret_path
) {
1434 _cleanup_free_
char *tmp
= NULL
;
1440 /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
1441 assert((flags
& O_EXCL
) == 0);
1443 /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
1444 * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
1445 * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
1448 _cleanup_free_
char *dn
= NULL
;
1450 dn
= dirname_malloc(target
);
1454 fd
= open(dn
, O_TMPFILE
|flags
, 0640);
1460 log_debug_errno(errno
, "Failed to use O_TMPFILE on %s: %m", dn
);
1463 r
= tempfn_random(target
, NULL
, &tmp
);
1467 fd
= open(tmp
, O_CREAT
|O_EXCL
|O_NOFOLLOW
|O_NOCTTY
|flags
, 0640);
1471 *ret_path
= TAKE_PTR(tmp
);
1476 int open_serialization_fd(const char *ident
) {
1479 fd
= memfd_create(ident
, MFD_CLOEXEC
);
1483 path
= getpid_cached() == 1 ? "/run/systemd" : "/tmp";
1484 fd
= open_tmpfile_unlinkable(path
, O_RDWR
|O_CLOEXEC
);
1488 log_debug("Serializing %s to %s.", ident
, path
);
1490 log_debug("Serializing %s to memfd.", ident
);
1495 int link_tmpfile(int fd
, const char *path
, const char *target
) {
1500 /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
1501 * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
1502 * on the directory, and renameat2() is used instead.
1504 * Note that in both cases we will not replace existing files. This is because linkat() does not support this
1505 * operation currently (renameat2() does), and there is no nice way to emulate this. */
1508 if (rename_noreplace(AT_FDCWD
, path
, AT_FDCWD
, target
) < 0)
1511 char proc_fd_path
[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd
) + 1];
1513 xsprintf(proc_fd_path
, "/proc/self/fd/%i", fd
);
1515 if (linkat(AT_FDCWD
, proc_fd_path
, AT_FDCWD
, target
, AT_SYMLINK_FOLLOW
) < 0)
1522 int read_nul_string(FILE *f
, char **ret
) {
1523 _cleanup_free_
char *x
= NULL
;
1524 size_t allocated
= 0, n
= 0;
1529 /* Reads a NUL-terminated string from the specified file. */
1534 if (!GREEDY_REALLOC(x
, allocated
, n
+2))
1538 if (c
== 0) /* Terminate at NUL byte */
1543 break; /* Terminate at EOF */
1562 int mkdtemp_malloc(const char *template, char **ret
) {
1563 _cleanup_free_
char *p
= NULL
;
1569 p
= strdup(template);
1577 p
= strjoin(tmp
, "/XXXXXX");
1589 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile
);
1591 int read_line(FILE *f
, size_t limit
, char **ret
) {
1592 _cleanup_free_
char *buffer
= NULL
;
1593 size_t n
= 0, allocated
= 0, count
= 0;
1597 /* Something like a bounded version of getline().
1599 * Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
1602 * Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
1603 * the number of characters in the returned string). When EOF is hit, 0 is returned.
1605 * The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
1606 * delimiters. If the limit is hit we fail and return -ENOBUFS.
1608 * If a line shall be skipped ret may be initialized as NULL. */
1611 if (!GREEDY_REALLOC(buffer
, allocated
, 1))
1616 _unused_
_cleanup_(funlockfilep
) FILE *flocked
= f
;
1626 c
= fgetc_unlocked(f
);
1628 /* if we read an error, and have no data to return, then propagate the error */
1629 if (ferror_unlocked(f
) && n
== 0)
1630 return errno
> 0 ? -errno
: -EIO
;
1637 if (IN_SET(c
, '\n', 0)) /* Reached a delimiter */
1641 if (!GREEDY_REALLOC(buffer
, allocated
, n
+ 2))
1644 buffer
[n
] = (char) c
;
1654 *ret
= TAKE_PTR(buffer
);