src/basic/fileio.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <dirent.h>
   5 #include <stdbool.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <sys/types.h>
   9
  10 #include "macro.h"
  11 #include "time-util.h"
  12
  13 typedef enum {
  14         WRITE_STRING_FILE_CREATE            = 1 << 0,
  15         WRITE_STRING_FILE_ATOMIC            = 1 << 1,
  16         WRITE_STRING_FILE_AVOID_NEWLINE     = 1 << 2,
  17         WRITE_STRING_FILE_VERIFY_ON_FAILURE = 1 << 3,
  18         WRITE_STRING_FILE_SYNC              = 1 << 4,
  19         WRITE_STRING_FILE_DISABLE_BUFFER    = 1 << 5,
  20
  21         /* And before you wonder, why write_string_file_atomic_label_ts() is a separate function instead of just one
  22            more flag here: it's about linking: we don't want to pull -lselinux into all users of write_string_file()
  23            and friends. */
  24
  25 } WriteStringFileFlags;
  26
  27 int write_string_stream_ts(FILE *f, const char *line, WriteStringFileFlags flags, struct timespec *ts);
  28 static inline int write_string_stream(FILE *f, const char *line, WriteStringFileFlags flags) {
  29         return write_string_stream_ts(f, line, flags, NULL);
  30 }
  31 int write_string_file_ts(const char *fn, const char *line, WriteStringFileFlags flags, struct timespec *ts);
  32 static inline int write_string_file(const char *fn, const char *line, WriteStringFileFlags flags) {
  33         return write_string_file_ts(fn, line, flags, NULL);
  34 }
  35
  36 int write_string_filef(const char *fn, WriteStringFileFlags flags, const char *format, ...) _printf_(3, 4);
  37
  38 int read_one_line_file(const char *fn, char **line);
  39 int read_full_file(const char *fn, char **contents, size_t *size);
  40 int read_full_stream(FILE *f, char **contents, size_t *size);
  41
  42 int verify_file(const char *fn, const char *blob, bool accept_extra_nl);
  43
  44 int parse_env_filev(FILE *f, const char *fname, const char *separator, va_list ap);
  45 int parse_env_file(FILE *f, const char *fname, const char *separator, ...) _sentinel_;
  46 int load_env_file(FILE *f, const char *fname, const char *separator, char ***l);
  47 int load_env_file_pairs(FILE *f, const char *fname, const char *separator, char ***l);
  48
  49 int merge_env_file(char ***env, FILE *f, const char *fname);
  50
  51 int write_env_file(const char *fname, char **l);
  52
  53 int executable_is_script(const char *path, char **interpreter);
  54
  55 int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field);
  56
  57 DIR *xopendirat(int dirfd, const char *name, int flags);
  58
  59 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f);
  60 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f);
  61
  62 int fflush_and_check(FILE *f);
  63 int fflush_sync_and_check(FILE *f);
  64
  65 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
  66 int mkostemp_safe(char *pattern);
  67 int fmkostemp_safe(char *pattern, const char *mode, FILE**_f);
  68
  69 int tempfn_xxxxxx(const char *p, const char *extra, char **ret);
  70 int tempfn_random(const char *p, const char *extra, char **ret);
  71 int tempfn_random_child(const char *p, const char *extra, char **ret);
  72
  73 int write_timestamp_file_atomic(const char *fn, usec_t n);
  74 int read_timestamp_file(const char *fn, usec_t *ret);
  75
  76 int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space);
  77
  78 int open_tmpfile_unlinkable(const char *directory, int flags);
  79 int open_tmpfile_linkable(const char *target, int flags, char **ret_path);
  80 int open_serialization_fd(const char *ident);
  81
  82 int link_tmpfile(int fd, const char *path, const char *target);
  83
  84 int read_nul_string(FILE *f, char **ret);
  85
  86 int mkdtemp_malloc(const char *template, char **ret);
  87
  88 int read_line(FILE *f, size_t limit, char **ret);