src/lxc/file_utils.h

   1 /* liblxcapi
   2  *
   3  * Copyright © 2018 Christian Brauner <christian.brauner@ubuntu.com>.
   4  * Copyright © 2018 Canonical Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifndef __LXC_FILE_UTILS_H
  21 #define __LXC_FILE_UTILS_H
  22
  23 #include <fcntl.h>
  24 #include <stdbool.h>
  25 #include <stdio.h>
  26 #include <sys/stat.h>
  27 #include <sys/types.h>
  28 #include <sys/vfs.h>
  29 #include <unistd.h>
  30
  31 /* read and write whole files */
  32 extern int lxc_write_to_file(const char *filename, const void *buf,
  33                              size_t count, bool add_newline, mode_t mode);
  34 extern int lxc_read_from_file(const char *filename, void *buf, size_t count);
  35
  36 /* send and receive buffers completely */
  37 extern ssize_t lxc_write_nointr(int fd, const void *buf, size_t count);
  38 extern ssize_t lxc_send_nointr(int sockfd, void *buf, size_t len, int flags);
  39 extern ssize_t lxc_read_nointr(int fd, void *buf, size_t count);
  40 extern ssize_t lxc_read_nointr_expect(int fd, void *buf, size_t count,
  41                                       const void *expected_buf);
  42 extern ssize_t lxc_recv_nointr(int sockfd, void *buf, size_t len, int flags);
  43
  44 extern bool file_exists(const char *f);
  45 extern int print_to_file(const char *file, const char *content);
  46 extern int is_dir(const char *path);
  47 extern int lxc_count_file_lines(const char *fn);
  48 extern int lxc_make_tmpfile(char *template, bool rm);
  49
  50 /* __typeof__ should be safe to use with all compilers. */
  51 typedef __typeof__(((struct statfs *)NULL)->f_type) fs_type_magic;
  52 extern bool has_fs_type(const char *path, fs_type_magic magic_val);
  53 extern bool fhas_fs_type(int fd, fs_type_magic magic_val);
  54 extern bool is_fs_type(const struct statfs *fs, fs_type_magic magic_val);
  55 extern FILE *fopen_cloexec(const char *path, const char *mode);
  56 extern ssize_t lxc_sendfile_nointr(int out_fd, int in_fd, off_t *offset,
  57                                    size_t count);
  58 extern char *file_to_buf(char *path, size_t *length);
  59
  60 #endif /* __LXC_FILE_UTILS_H */