src/basic/stat-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2010-2012 Lennart Poettering
   8 ***/
   9
  10 #include <stdbool.h>
  11 #include <stddef.h>
  12 #include <sys/stat.h>
  13 #include <sys/statfs.h>
  14 #include <sys/types.h>
  15 #include <sys/vfs.h>
  16
  17 #include "macro.h"
  18
  19 int is_symlink(const char *path);
  20 int is_dir(const char *path, bool follow);
  21 int is_device_node(const char *path);
  22
  23 int dir_is_empty(const char *path);
  24
  25 static inline int dir_is_populated(const char *path) {
  26         int r;
  27         r = dir_is_empty(path);
  28         if (r < 0)
  29                 return r;
  30         return !r;
  31 }
  32
  33 bool null_or_empty(struct stat *st) _pure_;
  34 int null_or_empty_path(const char *fn);
  35 int null_or_empty_fd(int fd);
  36
  37 int path_is_read_only_fs(const char *path);
  38
  39 int files_same(const char *filea, const char *fileb, int flags);
  40
  41 /* The .f_type field of struct statfs is really weird defined on
  42  * different archs. Let's give its type a name. */
  43 typedef typeof(((struct statfs*)NULL)->f_type) statfs_f_type_t;
  44
  45 bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) _pure_;
  46 int fd_is_fs_type(int fd, statfs_f_type_t magic_value);
  47 int path_is_fs_type(const char *path, statfs_f_type_t magic_value);
  48
  49 bool is_temporary_fs(const struct statfs *s) _pure_;
  50 bool is_network_fs(const struct statfs *s) _pure_;
  51
  52 int fd_is_temporary_fs(int fd);
  53 int fd_is_network_fs(int fd);
  54
  55 int fd_is_network_ns(int fd);
  56
  57 int path_is_temporary_fs(const char *path);
  58
  59 /* Because statfs.t_type can be int on some architectures, we have to cast
  60  * the const magic to the type, otherwise the compiler warns about
  61  * signed/unsigned comparison, because the magic can be 32 bit unsigned.
  62  */
  63 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
  64
  65 int stat_verify_regular(const struct stat *st);
  66 int fd_verify_regular(int fd);