src/lxc/file_utils.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #ifndef __LXC_FILE_UTILS_H
   4 #define __LXC_FILE_UTILS_H
   5
   6 #include <fcntl.h>
   7 #include <stdbool.h>
   8 #include <stdio.h>
   9 #include <sys/stat.h>
  10 #include <sys/types.h>
  11 #include <sys/uio.h>
  12 #include <sys/vfs.h>
  13 #include <unistd.h>
  14
  15 /* read and write whole files */
  16 extern int lxc_write_to_file(const char *filename, const void *buf,
  17                              size_t count, bool add_newline, mode_t mode);
  18 extern int lxc_readat(int dirfd, const char *filename, void *buf, size_t count);
  19 extern int lxc_writeat(int dirfd, const char *filename, const void *buf,
  20                        size_t count);
  21 extern int lxc_write_openat(const char *dir, const char *filename,
  22                             const void *buf, size_t count);
  23 extern int lxc_read_from_file(const char *filename, void *buf, size_t count);
  24
  25 /* send and receive buffers completely */
  26 extern ssize_t lxc_write_nointr(int fd, const void *buf, size_t count);
  27 extern ssize_t lxc_send_nointr(int sockfd, void *buf, size_t len, int flags);
  28 extern ssize_t lxc_read_nointr(int fd, void *buf, size_t count);
  29 extern ssize_t lxc_read_nointr_expect(int fd, void *buf, size_t count,
  30                                       const void *expected_buf);
  31 extern ssize_t lxc_read_file_expect(const char *path, void *buf, size_t count,
  32                                       const void *expected_buf);
  33 extern ssize_t lxc_recv_nointr(int sockfd, void *buf, size_t len, int flags);
  34 ssize_t lxc_recvmsg_nointr_iov(int sockfd, struct iovec *iov, size_t iovlen,
  35                                int flags);
  36
  37 extern bool file_exists(const char *f);
  38 extern int print_to_file(const char *file, const char *content);
  39 extern int is_dir(const char *path);
  40 extern int lxc_count_file_lines(const char *fn);
  41 extern int lxc_make_tmpfile(char *template, bool rm);
  42
  43 /* __typeof__ should be safe to use with all compilers. */
  44 typedef __typeof__(((struct statfs *)NULL)->f_type) fs_type_magic;
  45 extern bool has_fs_type(const char *path, fs_type_magic magic_val);
  46 extern bool fhas_fs_type(int fd, fs_type_magic magic_val);
  47 extern bool is_fs_type(const struct statfs *fs, fs_type_magic magic_val);
  48 extern FILE *fopen_cloexec(const char *path, const char *mode);
  49 extern ssize_t lxc_sendfile_nointr(int out_fd, int in_fd, off_t *offset,
  50                                    size_t count);
  51 extern char *file_to_buf(char *path, size_t *length);
  52 extern int fd_to_fd(int from, int to);
  53 extern int lxc_open_dirfd(const char *dir);
  54
  55 #endif /* __LXC_FILE_UTILS_H */